Treatment Chair

Abstract

The present invention relates to a diagnosis and treatment chair. In the diagnosis and treatment chair of the present invention including a link part for adjusting the posture of a headrest, the link part may include: a first link member, which can be fixed to the backrest of the diagnosis and treatment chair; a second link member, one end of which is hinged to the first link member through a first hinge pin; and a first ratchet member, formed on one side of at least one of the first link member and the second link member, for limiting the movement of the second link member so that the second link member rotates only in one direction with the central axis of the first hinge pin as the center, and the first ratchet member may include: a first ratchet base part, on one side of which a gear having a shape inclined only in one direction is formed, the gear is arranged in a ring with the central axis of the first hinge pin as the center, and bulges in the direction of the central axis, and the opposite side is fixed to the first link member; and a first ratchet rotating part, on one side of which a plurality of gears are formed, at least a portion of the gears are meshed with at least a portion of the gears of the first ratchet base part, and the opposite side is fixed to the second link member.

Description

Technical Field

[0001] The invention relates to a diagnosis and treatment chair. Background Art

[0002] A treatment chair is a device used in dentistry and the like to accommodate a patient, and generally includes a backrest for supporting the patient's back and a seat (leg rest) for supporting the buttocks and legs. In addition, it may also include a headrest for supporting the patient's head, a doctor's treatment table or a mouthwash basin for placing dental surgical tools such as mobile phones to treat the patient, a water supply table, etc.

[0003] The seat is supported by a base placed on the floor of a dental treatment space. A driving unit capable of adjusting the height of the seat may be provided on at least one of the base and the seat.

[0004] The backrest is connected to one end of the chair, and the chair can be tilted. The subject is placed in a sitting position by tilting the backrest forward to stand, and is placed in a lying position by tilting the backrest backward to invert, thereby obtaining a posture of the subject suitable for the treatment situation.

[0005] The headrest is formed at the upper end of the backrest, and the angle can be adjusted preferably according to the purpose of treatment, or the body shape of the patient and the convenience of the medical staff. Looking at the treatment situation that requires adjustment of the headrest angle, in most cases, the medical staff cannot use both hands freely because they hold the treatment tool in one hand, or the head of the patient applies a load to the headrest.

[0006] Therefore, preferably, when the subject wants to adjust the angle or posture of the headrest in the direction of bowing the head forward or moving forward, the angle can be adjusted by gently pushing the headrest with one hand without operating another button or lever. In addition, the angle can be adjusted in the direction of erecting the subject's head (the opposite direction) only when another button or lever is operated, otherwise it is best to firmly support the head.

[0007] The design of the above-mentioned buttons or levers is very important. Reliability must be ensured so that the angle can be adjusted in the opposite direction only when the button or lever is pressed with appropriate force. In addition, due to the characteristics of dental treatment, many hand movements of the doctor are performed near the headrest. Therefore, if the hand touches the button or lever and causes an erroneous operation, it may cause injury to the examinee, so more attention needs to be paid. Therefore, a safety measure that can effectively prevent erroneous operations is required.

[0008] However, as described above, it is not easy to ensure durability in a structure that can adjust the angle only in one direction and supports the subject's head in the opposite direction.

[0009] In addition to ensuring durability, it is also necessary to propose a structure that can adjust the posture of the headrest more finely while solving side effects such as adhesion between members constituting the structure and that can be easily manufactured.

[0010] In addition, there is a need to provide a headrest support structure that can be adjusted in angle in only one direction and can be positioned to suit the body shapes of subjects of various heights, including very short subjects such as children. Summary of the invention

[0011] Technical issues

[0012] The present invention is proposed in view of the above problems, and its object is to provide a treatment chair that can adjust the positive direction angle of the headrest and ensure the durability of the supporting structure when a force in the reverse direction is applied.

[0013] In addition, another object of the present invention is to provide a supporting structure of a headrest, which can accurately adjust the posture of the headrest and solve the side effects caused thereby.

[0014] In addition, another object of the present invention is to provide a headrest support structure which not only reduces the number of parts but also can be easily manufactured by injection molding.

[0015] Still another object of the present invention is to provide a support structure for a headrest that can adjust the posture of subjects of various heights accommodated in a treatment chair.

[0016] In addition, another object of the present invention is to provide a support structure of a double-joint headrest, which can independently release the movement restriction state of two joints and can adjust the angle in one direction.

[0017] In addition, another object of the present invention is to provide a treatment chair that can adjust the forward posture of the headrest and has a structure that supports and fixes the headrest when a force in the reverse direction is applied.

[0018] Still another object of the present invention is to provide a safety device for a treatment chair that prevents erroneous operation of a function of releasing a fixed state of a headrest that supports and fixes the headrest as required when a force in a reverse direction is applied.

[0019] Means of solving problems

[0020] According to an embodiment of the present invention, a diagnosis and treatment chair includes a link portion for adjusting the posture of a headrest, wherein the link portion includes: a first link member that can be fixed to the backrest of the diagnosis and treatment chair; a second link member, one end of which is hinged to the first link member through a first hinge pin; and a first ratchet member formed on one side of at least one of the first link member and the second link member, for limiting the movement of the second link member so that the second link member rotates only in one direction with the central axis of the first hinge pin as the center, and the first ratchet member may include: a first ratchet base portion, on one side of which a gear having a shape inclined only in one direction is formed, a plurality of the gears are arranged in a ring with the central axis of the first hinge pin as the center, and bulge toward the central axis, and the opposite side is fixed to the first link member; and a first ratchet rotating portion, on one side of which a plurality of gears are formed, at least a portion of the gears are meshed with at least a portion of the gears of the first ratchet base portion, and the opposite side is fixed to the second link member.

[0021] Furthermore, it may further include: a third link member, one end of which is hinged to the other end of the second link member through a second hinge pin, fixing the headrest on one side; and a second ratchet member formed on one side of at least one of the second link member and the third link member, for limiting the movement of the third link member so that the third link member can only rotate in one direction around the central axis of the second hinge pin.

[0022] Moreover, the second link component may include: a first release portion, which can release the movement restriction state of the second link component by transmitting external force to the first ratchet component; and a second release portion, which acts independently of the first release portion and can release the movement restriction state of the third link component by transmitting external force to the second ratchet component.

[0023] Moreover, the second link member includes a first releasing portion, which can release the movement restriction state of the second link member by transmitting external force to the first ratchet member. The first ratchet member limits the movement of the second link member, so that the second link member can only rotate in one direction with the central axis of the first hinge pin as the center according to the engagement of the gear of the first ratchet base with the gear of the first ratchet rotating part. When external force is applied, the first releasing portion can release the engagement of the first ratchet member to release the movement restriction state of the second link member.

[0024] Moreover, the second ratchet component may include: a second ratchet base portion, on one side of which is formed a gear having a shape inclined in only one direction, wherein a plurality of the gears are arranged in a ring around the central axis line of the second hinge pin and bulge in the direction of the central axis, and the opposite side is fixed to the third connecting rod component; and a second ratchet rotating portion, on one side of which is formed a plurality of gears, at least a portion of the gears are meshed with at least a portion of the gears of the second ratchet base portion, and the opposite side is fixed to the second connecting rod component.

[0025] The second link member includes a first release portion, which can release the movement restriction state of the second link member by transmitting external force to the first ratchet member. The first release portion may include: a first button protruding from an external side surface of the second link member and used to apply external force; and a first operating member formed inside the second link member and supported by a first elastic member. The first button and the first ratchet rotating part are fixed on one side of the first operating member. When an external force is applied to the first button, the first button and the first ratchet rotating part move as a whole to separate the first ratchet rotating part from the first ratchet base.

[0026] Furthermore, each gear of the first ratchet base portion and the first ratchet rotating portion may form an inclination angle of 40 degrees or more and 50 degrees or less in only one direction with respect to the surface on which the respective gear is formed.

[0027] Moreover, the inclination angle may be 45 degrees.

[0028] Furthermore, one of the number of gears of the first ratchet base portion and the number of gears of the first ratchet rotating portion may be a multiple of 2 or more of the other.

[0029] Furthermore, the number of gears of the first ratchet rotating portion may be twice the number of gears of the first ratchet base portion.

[0030] Furthermore, the plurality of gears of the first ratchet rotating part may be arranged in a ring shape at equal angular intervals.

[0031] Furthermore, the second link member is restricted in movement by the first ratchet member and can rotate only toward the backrest surface of the backrest portion, and the third link member is restricted in movement by the second ratchet member and can rotate only in the direction opposite to the rotatable direction of the second link member.

[0032] Moreover, the second release part may include: a second button protruding from an outer side surface of the second link member for applying an external force; and a second operating member formed inside the second link member and supported by a second elastic member, the second button and the second ratchet rotating part being fixed on one side of the second operating member, and when an external force is applied to the second button, the second button and the second ratchet rotating part move as a whole to separate the second ratchet rotating part from the second ratchet base part.

[0033] Furthermore, when viewed from the center axis direction of the first hinge pin, a surface of the outer surface of the second link member that becomes a front end when the second link member rotates in the one direction may be formed in a concave shape.

[0034] Furthermore, preferably, when the first link member is fixed to the backrest portion, the other end portion of the second link member, rather than the one end portion, can contact the backrest surface of the backrest portion by rotating the second link member in the one direction.

[0035] According to other embodiments of the present invention, the diagnosis and treatment chair includes a link portion for adjusting the posture of the headrest, wherein the link portion includes: a first link member, which can be fixed to the backrest of the diagnosis and treatment chair; a second link member, one end of which is hinged to the first link member through a first hinge pin; a third link member, one end of which is hinged to the other end of the second link member through a second hinge pin, fixing the headrest on one side; a first ratchet member, formed on one side of at least one of the first link member and the second link member, for limiting the movement of the second link member so that the second link member The component rotates in only one direction with the central axis of the first hinge pin as the center according to the meshing of the inclined gears set facing each other; and a second ratchet component is formed on one side of at least one of the second link component and the third link component, and is used to limit the movement of the third link component, so that the third link component can only rotate in one direction with the central axis of the second hinge pin as the center according to the meshing of the inclined gears set facing each other. The second link component may include a releasing part, which releases the movement restriction state of the second link component by applying external force to the first ratchet component.

[0036] The release part may include: a first release part, which can release the movement restriction state of the second link member by transmitting external force to the first ratchet member; and a second release part, which acts independently of the first release part and can release the movement restriction state of the third link member by transmitting external force to the second ratchet member.

[0037] When external force is applied, the first releasing portion may release the movement restriction state of the second link member by releasing the meshing of the gear of the first ratchet member, and when external force is applied, the second releasing portion may release the movement restriction state of the third link member by releasing the meshing of the gear of the second ratchet member.

[0038] The first ratchet component may include: a first ratchet base portion, on one side of which a gear having a shape inclined only in one direction is formed, the gears are arranged in a ring with the central axis of the first hinge pin as the center, and bulge in the direction of the central axis, and the opposite surface is fixed to the first connecting rod component; and a first ratchet rotating portion, on one side of which a plurality of gears are formed, at least a portion of the gears are meshed with at least a portion of the gears of the first ratchet base portion, and the opposite surface is fixed to the second connecting rod component, the second ratchet component may include: a second ratchet base portion, on one side of which a gear having a shape inclined only in one direction is formed, the gears are arranged in a ring with the central axis wheel line of the second hinge pin as the center, and bulge in the direction of the central axis, and the opposite surface is fixed to the third connecting rod component; and a second ratchet rotating portion, on one side of which a plurality of gears are formed, at least a portion of the gears are meshed with at least a portion of the gears of the second ratchet base portion, and the opposite surface is fixed to the second connecting rod component.

[0039] Preferably, each gear of the first ratchet base portion, the first ratchet rotating portion, the second ratchet rotating portion and the second ratchet rotating portion forms an inclination angle of more than 40 degrees and less than 50 degrees in only one direction relative to the surface on which the respective gear is formed.

[0040] More preferably, the inclination angle is 45 degrees.

[0041] One of the number of gears of the first ratchet base and the number of gears of the first ratchet rotating part may be a multiple of 2 or more of the other, and one of the number of gears of the second ratchet base and the number of gears of the second ratchet rotating part may be a multiple of 2 or more of the other.

[0042] The number of gears of the first ratchet rotating part may be twice the number of gears of the first ratchet base part, and the number of gears of the second ratchet rotating part may be twice the number of gears of the second ratchet base part.

[0043] The gears of the first ratchet rotating part and the gears of the second ratchet rotating part may be arranged in a ring at equal angular intervals.

[0044] The second link member is restricted in movement by the first ratchet member and can rotate only toward the backrest surface of the backrest portion. The third link member is restricted in movement by the second ratchet member and can rotate only in the direction opposite to the rotatable direction of the second link member.

[0045] The first release part may include: a first button, which is protruded from an outer side surface of the second link member and is used to apply an external force; and a first operating member is formed inside the second link member and is supported by a first elastic member, and the first button and the first ratchet rotating part are fixed on one side of the first operating member. When an external force is applied to the first button, the first button and the first ratchet rotating part are moved as a whole to separate the first ratchet rotating part from the first ratchet base part. The second release part may include: a second button, which is protruded from an outer side surface of the second link member and is used to apply an external force; and a second operating member is formed inside the second link member and is supported by a second elastic member, and the second button and the second ratchet rotating part are fixed on one side of the second operating member. When an external force is applied to the second button, the second button and the second ratchet rotating part are moved as a whole to separate the second ratchet rotating part from the second ratchet base part.

[0046] When viewed from the center axis direction of the first hinge pin, a surface of the outer surface of the second link member that becomes a front end when the second link member rotates in the one direction may be formed in a concave shape.

[0047] The second link member may be formed in a “C” shape.

[0048] Preferably, when the first link member is fixed to the backrest portion, the other end portion of the second link member may contact a backrest surface of the backrest portion through the rotation of the second link member in the one direction.

[0049] At least one of the first releasing portion and the second releasing portion may include a button that moves along a trajectory including a central axis of the first hinge pin or a central axis of the second hinge pin when an external force is applied.

[0050] The second release portion may include a second button, which, when an external force is applied, pushes at least a portion of the second ratchet member to move along a trajectory including the central axis of the first hinge pin to release the engagement of the gear of the second ratchet member, thereby releasing the movement restriction state of the third link member.

[0051] The first release part may include: a first button protruding from an external side surface of the second link member, which moves along a trajectory that does not include the central axis of the first hinge pin and is parallel to the central axis of the first hinge pin when an external force is applied; and a first operating member formed inside the second link member and supported by a first elastic member, which moves integrally with the first button when an external force is applied, thereby releasing the engagement of the gear of the first ratchet member, thereby releasing the movement restriction state of the second link member.

[0052] According to another embodiment of the present invention, a diagnosis and treatment chair includes a link portion for adjusting the posture of a headrest, wherein the link portion may include: a first link member that can be fixed to a backrest portion of the diagnosis and treatment chair; a second link member, one end of which is hinged to the first link member by a first hinge pin; and a first ratchet member formed on one side of at least one of the first link member and the second link member, limiting the movement of the second link member so that the second link member can rotate only in one direction around the central axis of the first hinge pin, the second link member includes a first release portion, the first release portion releases the movement restriction state of the second link member by transmitting an external force to the first ratchet member, the first release portion includes a first deforming member whose shape or position changes with the application of an external force, and the applied external force can be transmitted to the first ratchet member only when the change in shape or position of the first deforming member exceeds a predetermined first reference amount.

[0053] Moreover, the first release portion also includes a first operating member formed inside the second link member and supported by the 1-1 elastic member, the first deformation member includes a first button protruding from an external side surface of the second link member and supported by the 1-2 elastic member, and as external force is applied to the first button, the first operating member transmits the applied external force to the first ratchet member only when the first button moves beyond a first reference displacement.

[0054] When the first button moves beyond the first reference displacement as an external force is applied, the first operating member may contact and move in conjunction with the first button.

[0055] Furthermore, a first protrusion penetrating through a hole formed in the first operating member is formed inside the housing of the second link member, and an outer wall of the first protrusion can guide a moving direction of the first operating member.

[0056] Furthermore, a first guide groove for guiding a moving direction of the first button may be formed in the first raised portion.

[0057] Furthermore, the 1-2 elastic member has one end connected to the first protrusion and the other end connected to the first button to support the first button and deform according to the movement of the first button.

[0058] The first ratchet component includes: a first ratchet base portion, on one side of which is formed a gear having a shape inclined in only one direction, wherein a plurality of the gears are arranged in a ring around the central axis line of the first hinge pin and bulge in the direction of the central axis, and the opposite side is fixed to the first connecting rod member; and a first ratchet rotating portion, on one side of which is formed a gear meshing with the gear of the first ratchet base portion, and the opposite side is fixed to the first connecting rod member, when an external force is applied to the first button, the first operating member moves together with the first button and the first ratchet rotating portion, so that the first ratchet rotating portion can be separated from the first ratchet base portion.

[0059] Moreover, the link portion includes: a third link member, one end of which is hinged to the other end of the second link member through a second hinge pin, fixing the headrest on one side; and a second ratchet member formed on one side of at least one of the second link member and the third link member, limiting the movement of the third link member so that the third link member can rotate only in one direction around the central axis of the second hinge pin, the second link member also includes a second release portion, the second release portion and the first release portion act independently to transmit an external force to the second ratchet member to release the movement restriction state of the third link member, the second release portion includes a second deforming member whose shape or position changes as an external force is applied, and the applied external force can be transmitted to the second ratchet member only when the change in shape or position of the second deforming member exceeds a predetermined second reference amount.

[0060] Moreover, the second release portion also includes a second operating member formed inside the second link member and supported by the 2-1 elastic member, the second deformation member includes a second button protruding from an external side surface of the second link member and supported by the 2-2 elastic member, and as external force is applied to the second button, the second operating member can transmit the applied external force to the second ratchet member only when the second button moves beyond the second reference displacement.

[0061] As the external force is applied, when the second button moves beyond the second reference displacement, the second operating member contacts and links with the second button, and the second ratchet member includes: a second ratchet base portion, on one side of which is formed a gear having a shape inclined only in one direction, wherein a plurality of the gears are arranged in a ring around the central axis wheel line of the second hinge pin, and bulge toward the central axis direction, and the opposite side is fixed to the third connecting rod member; and a second ratchet rotating portion, on one side of which is formed a gear meshing with the gear of the second ratchet base portion, and the opposite side is fixed to the second connecting rod member, when an external force is applied to the second button, the second operating member moves together with the second button and the second ratchet rotating portion, so that the second ratchet rotating portion can be separated from the second ratchet base portion.

[0062] Furthermore, the second link member is restricted in movement by the first ratchet member and can rotate only toward the backrest surface of the backrest portion, and the third link member is restricted in movement by the second ratchet member and can rotate only in the direction opposite to the rotatable direction of the second link member.

[0063] Effects of the Invention

[0064] According to various embodiments of the present invention, a structure can be provided that allows the positive angle of the headrest of the diagnosis and treatment chair to be freely adjusted with one hand, and provides firm support when a force is applied in the reverse direction.

[0065] In addition, according to various embodiments of the present invention, the forward posture of the headrest can be adjusted, and when a reverse force is applied, the durability of the structure that supports and fixes the headrest can be ensured.

[0066] In addition, according to various embodiments of the present invention, when a force in the opposite direction is applied, malfunction of the function in the state of releasing the support and fixing of the headrest as required can be effectively prevented.

[0067] In addition, according to various embodiments of the present invention, the posture of the headrest can be accurately adjusted corresponding to the body shapes of various subjects accommodated in the examination chair, and at the same time, side effects such as adhesion between components constituting the support structure of the headrest can be solved.

[0068] In addition, according to various embodiments of the present invention, a headrest support structure can be provided which eliminates complicated components such as gas springs and leaf springs to simplify the number of parts and can be easily manufactured by injection molding.

[0069] In addition, according to various embodiments of the present invention, the posture of the headrest can be adjusted to suit the body shapes of subjects of various heights accommodated in the examination chair.

[0070] In addition, according to various embodiments of the present invention, a support structure of a double-joint headrest can be realized that can independently release the movement restriction state of two joints and adjust the angle in one direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a three-dimensional diagram of a diagnosis and treatment chair according to an embodiment of the present invention.

[0072] Figure 2 This is a block diagram for explaining the structure of a diagnosis and treatment chair according to an embodiment of the present invention.

[0073] Figure 3 Detailed Description of the Invention This is a block diagram for explaining the structure of a link portion according to an embodiment of the present invention.

[0074] Figure 4 2 is a right side view of a connecting rod according to an embodiment of the present invention.

[0075] Figure 5 It is a diagram for explaining the structure of a first ratchet member according to an embodiment of the present invention.

[0076] Figure 6 It is a diagram for explaining the structure and operation of the release unit of the present invention.

[0077] Figure 7 The figures are a front view (a) and a right side view (b) for explaining the appearance of the second link member after assembly according to the present invention.

[0078] Figure 8 It is a diagram for explaining the shape of the second link member of the present invention.

[0079] Fig. 9 2 is a right side view of a connecting rod according to an embodiment of the present invention.

[0080] Fig.10 1 and 2 are right side and rear views of a connecting rod according to an embodiment of the present invention.

[0081] Fig.11 It is a diagram for explaining the structure and operation of the release unit of the present invention.

[0082] Fig.12 It is a diagram for explaining the structure of a releasing unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0083] The following content is merely an example to illustrate the principles of the present invention. Therefore, although not explicitly described or illustrated in this specification, a person skilled in the art to which the present invention belongs can invent various devices that embody the principles of the present invention and are included in the concept and scope of the present invention. Moreover, all conditional terms and embodiments cited in this specification are provided in principle for a clear understanding of the concept of the present invention, and therefore, it should be understood that the present invention is not limited to the specifically listed embodiments and states.

[0084] Furthermore, it should be understood that not only the principles, viewpoints and embodiments of the present invention, but also all detailed descriptions of specific embodiments include structural and functional equivalents of the matters described. Furthermore, it should be understood that the equivalents include all elements to be invented in the future that have the same function regardless of their structure, except for currently known equivalents.

[0085] The above objects, features and advantages will be clearly understood through the accompanying drawings and the following detailed description. Therefore, those skilled in the art to which the present invention belongs can easily implement the technical concept of the present invention. In addition, when describing the present invention, if it is determined that the specific description of the related known technology of the present invention will make the gist of the present invention unclear, the detailed description thereof will be omitted.

[0086] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0087] The treatment chair 10 according to an embodiment of the present invention is a device installed on the floor of a dental treatment space for a patient to sit or lie down on during treatment. The treatment chair 10 may have a shape corresponding to the body shape so that the patient does not feel uncomfortable during treatment.

[0088] Figure 1 is a three-dimensional diagram of a diagnosis and treatment chair according to an embodiment of the present invention, Figure 2 This is a block diagram for explaining the structure of a diagnosis and treatment chair according to an embodiment of the present invention.

[0089] As shown in these figures, the examination chair 10 according to an embodiment of the present invention generally includes a seat portion 200 for placing the legs of a subject, and a backrest portion 300 for the subject to lean against.

[0090] In addition, the diagnostic chair 10 may include: a headrest portion 600 for supporting the head of the examinee; a base portion 700 for supporting the seat portion 200; a driving portion 400 for driving at least one of the backrest portion 300 and the seat portion 200; and a control portion 100 for controlling the driving portion 400. An armrest for placing the examinee's arm may be formed on at least one side of the backrest portion 300 and the seat portion 200.

[0091] In addition, the diagnosis and treatment chair 10 may include associated devices. For example, it may include a treatment table portion 800 on which surgical instruments, case cards, etc. for treating the subject are placed, or an interface for operating instruments is provided. In addition, it may include at least one of a lighting unit (omitted in the figure) for illuminating the subject, a water supply unit (omitted in the figure) for supplying mouthwash for the subject to rinse his mouth, a control unit (omitted in the figure), a display unit (omitted in the figure), a foot control unit (omitted in the figure, Foot Control Unit), and a power supply unit (omitted in the figure).

[0092] The seat part 200 may be a part that contacts the lower body including the buttocks of the subject. The seat part 200 may be supported by the base part 700. A footrest (not shown) for supporting the foot part of the subject may be combined at the end of the seat part 200. The footrest (not shown) combined with the seat part 200 may be adjusted in distance and / or distance as needed.

[0093] For the convenience of the therapist and the patient, a part of the treatment chair 10 can be operated separately from other parts.

[0094] The backrest 300 may be a portion that contacts the back of the subject. A headrest 600 may be connected to the upper side of the backrest 300. The headrest 600 connected to the backrest 300 may be adjusted in angle as needed. The angle of the headrest 600 may be adjusted electrically and / or manually. The backrest 300 may be combined with the seat 200 and / or the base 700.

[0095] The headrest portion 600 may include a headrest 610 that contacts the subject's head. The headrest 610 may be processed into a shape in which at least a portion is recessed so as to correspond to the shape of the head.

[0096] The armrests may be located on both sides of the seat portion 200 or the backrest portion 300. The armrests may be provided at positions corresponding to portions where both arms of the examinee sitting on the seat portion 200 are naturally positioned so that the examinee can be examined in a stable posture.

[0097] The treatment table 800 may be a cradle for placing various dental surgical instruments for inspection and / or treatment. At least one of electricity, air pressure, and hydraulic pressure for operating the surgical instruments may be supplied to the treatment table 800. For example, the supplied electricity may be used to turn on a dental light of one of the surgical instruments.

[0098] The treatment table 800 may include various switches. Considering the position of the operator, the treatment table 800 may be located at a distance that the operator can easily reach. Therefore, the treatment table 800 may be equipped with various switches for controlling each part of the diagnosis and treatment chair 10.

[0099] The lighting unit (not shown) can be positioned at a position where the inside of the subject's mouth is not blocked by the operator's body, etc. For example, when the examiner moves his upper body to examine the inside of the subject's mouth, the inside of the mouth can be positioned at an upper position where it does not become dark.

[0100] The lighting unit (not shown) can emit different lights as needed, which means, for example, that the brightness and / or wavelength can be adjusted according to the surrounding brightness and / or the inspection content.

[0101] In one embodiment, when the posture of the headrest 610 is adjusted by operating the link portion 900 of the present invention, the control unit 100 may control the brightness of the illumination of the illumination unit (not shown) accordingly.

[0102] The water supply unit (not shown) can be used for cleaning the inside of the oral cavity of the subject. The water supply unit (not shown) can include a drainage device and / or a spit-rinse station.

[0103] The display unit (not shown) can display various information required for the examination. For example, it means that an X-ray image of the subject's oral state, an image of the inside of the subject's oral cavity, etc. can be displayed in real time. The position / angle of the display unit 207 can be adjusted up, down, left, and right as needed to reduce the fatigue of the subject.

[0104] The foot control unit (not shown) can be used to adjust the motion of at least one dental surgical instrument. The subject can freely use both hands while operating the foot control unit (not shown) to control the surgical instrument.

[0105] The control unit 100 may perform a control operation on each part of the diagnosis and treatment chair 10. The control unit 100 may make each part of the diagnosis and treatment chair 10 act organically.

[0106] The control unit 100 can be distributed in multiple locations. For example, the base unit 800 can be controlled by a first control unit, and the treatment table unit 800 can be controlled by a second control unit. The first control unit and the second control unit can send unidirectional or bidirectional signals to make the treatment chair 10 act in a coordinated manner as a whole.

[0107] The control unit 100 can control the associated devices of the diagnosis and treatment chair 10. For example, when the control unit 100 is located at the base unit 800, it can control all or part of the components of the diagnosis and treatment chair 10 used with the base unit 800 during the examination. For example, it means that activation or deactivation control operations can be performed on the associated devices.

[0108] The power supply unit (not shown) may be a device for supplying power to the examination and treatment chair 10. The power supply unit (not shown) may include an AC / DC power converter and / or a voltage / current converter suitable for each component.

[0109] like Figure 2 As shown, according to an embodiment of the present invention, the headrest portion 600 may include a headrest 610 for supporting the subject's head, and a connecting rod portion 900 connecting the headrest 610 and one end of the backrest portion 300 .

[0110] The link part 900 can perform an operation for adjusting the posture of the headrest 610. That is, the headrest 610 is connected to one end of the backrest 300, and basically has the function of supporting the head load of the subject, and during treatment, the angle adjustment operation of tilting or unfolding the headrest 310 in the front-back direction of the subject's head, or the posture adjustment of moving the headrest 310 forward or backward can be performed according to convenience.

[0111] The user (medical staff) can adjust the angle or posture by grasping the headrest 610 with one hand and applying external force.

[0112] Hereinafter, the structure of the link portion 300 of the present invention will be described in more detail with reference to the accompanying drawings.

[0113] Figure 3 is a block diagram for explaining the structure of a connecting rod according to an embodiment of the present invention. Figure 4 2 is a right side view of a connecting rod according to an embodiment of the present invention. Figure 3 and Figure 4 The link portion 900 may include a series of first link members 910 and second link members 920. In addition, according to an embodiment, the link portion 900 may further include a third link member 930.

[0114] The first link member 910 may be fixed to the backrest portion 300 of the diagnosis and treatment chair 10 .

[0115] In an embodiment of the present invention, the first link member 910 may be coupled to one end of the backrest portion 300 to be semi-permanently fixed.

[0116] In another embodiment of the present invention, the first link member 910 is formed to be long and slidably coupled to an insertion hole at one end of the backrest portion 300 .

[0117] When the diagnosis and treatment chair 10 needs to accommodate a taller examinee, the first link member 910 can be slidably fixed at a specific position so that the headrest 610 is away from the one end of the backrest 300 .

[0118] When the diagnosis and treatment chair 10 needs to accommodate a shorter examinee, the first link member 910 can be slidably fixed at a specific position so that the headrest 610 is close to the one end of the backrest 300 .

[0119] One end of the second link member 920 may be hinged to the first link member 910 via a first hinge pin 911 .

[0120] One end of the third link member 930 may be hinged to the other end of the second link member 920 instead of the one end via a second hinge pin 931 .

[0121] like Figure 4 As shown, a headrest 610 may be fixed on one side of the third link member.

[0122] The link portion 900 may further include a first ratchet member 940 formed on one surface of at least one of the first link member 910 and the second link member 920 .

[0123] The first ratchet member 940 may include two sub-members, and the two sub-members may contact each other and rotate relative to each other in only one direction.

[0124] The two sub-components may be a first ratchet base portion 941 and a first ratchet rotating portion 945 of the present invention which will be described later.

[0125] By using a ratchet structure instead of a gas spring, a leaf spring, or the like, the structure of the headrest portion 300 can be further simplified.

[0126] The first ratchet member 940 can limit the movement of the second link member 920 to rotational movement in one direction.

[0127] The first ratchet member 940 can limit the movement of the second link member 920 so that the second link member 920 is moved about the central axis ( Figure 4 The center of the "+" shape below is the center and only moves in one direction ( Figure 4 , the direction indicated by the dotted arrow below).

[0128] The second link member 920 may include a releasing portion 960 that can release the movement restriction state of the second link member 920 by transmitting an external force to the first ratchet member 940 .

[0129] The link portion 900 of the present invention may further include a second ratchet member 950 formed on one surface of at least one of the second link member 920 and the third link member 930 .

[0130] The second ratchet member 950 may be formed to be the same in structure as the first ratchet member 940 .

[0131] The second ratchet member 950 can limit the movement of the third link member 930 to a rotational movement in one direction.

[0132] The second ratchet member 950 can limit the movement of the third link member 930 so that the third link member 930 is moved about the central axis ( Figure 4 The center of the "+" shape above is the center and only moves in one direction ( Figure 4 , the direction indicated by the dotted arrow above).

[0133] In an embodiment further including a second ratchet member 950 , the releasing portion 960 may transmit an external force to the second ratchet member 950 to release the movement restriction state of the third link member 930 .

[0134] The first ratchet member 940 may be formed on one surface of at least one of the first link member 910 and the second link member 920 .

[0135] The second ratchet member 950 may be formed on one surface of at least one of the second link member 920 and the third link member 930 .

[0136] Figure 5 It is a diagram for explaining the structure of a first ratchet member according to an embodiment of the present invention.

[0137] like Figure 5 (a) and its partial enlarged view Figure 5 As shown in (b), the first ratchet member 940 can limit the movement of the second link member 920, so that the second link member 920 can rotate in only one direction around the central axis of the first hinge pin 911 according to the meshing of the inclined gears arranged facing each other.

[0138] The first ratchet member 940 may include two gear sets, each of which is composed of a plurality of gears inclined in only one direction.

[0139] The two gear sets may mean forming Figure 5 A set of gears 942 of the part 941 shown at the top and formed in Figure 5 A set of gears 946 of part 945 is shown at the bottom.

[0140] The first ratchet member 940 can limit the movement of the second link member 920, so that the second link member 920 can rotate in only one direction around the central axis of the first hinge pin 911 through the two gear sets connected to each other.

[0141] The second ratchet member 950 may be formed in the same structure as the first ratchet member 940 .

[0142] In addition, the second ratchet member 950 can restrict the movement of the third link member 930 so that the third link member 930 can rotate in only one direction around the central axis of the second hinge pin 931 according to the meshing of the inclined gears disposed opposite to each other.

[0143] The second ratchet member 950 may include two gear sets, each of which is composed of a plurality of gears inclined in only one direction.

[0144] The second ratchet member 950 can limit the movement of the third link member 930 , so that the third link member 930 can rotate in only one direction around the central axis of the second hinge pin 931 through the two gear sets connected to each other.

[0145] When an external force is applied, the first releasing portion 970 releases the mutual connection between the two gear sets of the first ratchet member 940 , thereby releasing the movement restriction state of the second link member 920 .

[0146] When an external force is applied, the second releasing portion 980 releases the mutual connection between the two gear sets of the second ratchet member 950 , thereby releasing the movement restriction state of the third link member 930 .

[0147] More specifically, the first ratchet member 940 may include a first ratchet base portion 941 and a first ratchet rotating portion 945. When the first ratchet base portion 941 and the first ratchet rotating portion 945 are connected to each other, they may form a clutch structure for transmitting force, that is, a one-way clutch system may be realized.

[0148] The second ratchet member 950 may include a second ratchet base portion 951 and a second ratchet rotating portion 955. When the second ratchet base portion 951 and the second ratchet rotating portion 955 are connected to each other, they may form a clutch structure for transmitting force.

[0149] The first ratchet base portion 941 may have a gear 942 on one side thereof having a shape inclined in only one direction. The gears are arranged in a ring with the central axis of the first hinge pin 911 as the center and bulge toward the central axis. The opposite side of the one side may be fixed to the first connecting rod member 910.

[0150] The second ratchet base portion 951 may have a gear 952 on one side thereof having a shape inclined in only one direction. The gears are arranged in a ring with the central axis of the second hinge pin 931 as the center and bulge toward the central axis. The opposite side of the one side may be fixed to the third connecting rod member 930.

[0151] The first ratchet rotating part 945 may have a plurality of gears 946 formed on one surface, and at least a portion of the gears may mesh with at least a portion of the gears 942 of the first ratchet base part 941. The opposite surface of the one surface may be fixed to the second link member 920.

[0152] The second ratchet rotating part 955 may have a plurality of gears 956 formed on one surface, and at least a portion of the gears 956 mesh with at least a portion of the gears 952 of the second ratchet base part 951. The opposite surface of the one surface may be fixed to the second link member 920.

[0153] As described above, by means of a structure in which a plurality of gears are meshed in an annular arrangement, the force transmitted between the first ratchet rotating portion 945 and the first ratchet base portion 941 and the force transmitted between the second ratchet rotating portion 955 and the second ratchet base portion 951 can be dispersed according to the number of gears. Therefore, the head of the subject can be supported with a stronger force, and the life of the ratchet member can be extended to ensure durability.

[0154] Furthermore, the first ratchet rotating portion 945 and the first ratchet base portion 941 are formed of a synthetic resin material rather than a metal and then manufactured by injection molding, thereby saving the cost required for materials and processing.

[0155] The gear 946 may also be formed in a shape that is inclined only in one direction. Therefore, although the gears 942 and 946 can slide when the mutual force is transmitted to each inclined surface, they cannot slide when the mutual thrust is transmitted to the intersecting surfaces, and therefore, the first ratchet base portion 941 and the first ratchet rotating portion 945 cannot rotate relative to each other.

[0156] Generally, the teeth of the gears are formed on the inclined surfaces corresponding to the two directions of rotation. Figure 5 As shown in (a) and (b), an inclined surface is formed to be inclined in one direction and to be formed to be at a right angle in the other direction.

[0157] The right angle in the present invention may be a right angle in a practical sense, rather than a right angle in a geometric sense.

[0158] When the inclined surface is too gentle, the ratchet base parts 941, 951 and the corresponding ratchet rotating parts 945, 955 can be easily released from the mutual movement restriction state. In this case, during the treatment of the subject, the headrest 610 may fall to the back of the subject, causing inconvenience and danger.

[0159] When the inclined surface is too steep, it is difficult for the ratchet base parts 941, 951 and the corresponding ratchet rotating parts 945, 955 to rotate in one direction. In this case, it is difficult to achieve the purpose of changing the position and posture of the headrest to the state required for treatment with one hand.

[0160] Preferably, each gear 942, 946 of the first ratchet base portion 941 and the first ratchet rotating portion 945 forms an inclination angle of more than 40 degrees and less than 50 degrees in only one direction relative to the surface on which each gear 942, 946 is formed ( Figure 5 (b) CL).

[0161] More preferably, the inclination angle CL is 45 degrees.

[0162] Each gear 952 , 956 of the second ratchet base portion 951 and the second ratchet rotating portion 955 forms an inclination angle of 40 degrees or more and 50 degrees or less in only one direction with respect to the surface on which each gear 952 , 956 is formed.

[0163] More preferably, the inclination angle is 45 degrees.

[0164] One of the number of the gears 942 of the first ratchet base portion 941 and the number of the gears 946 of the first ratchet rotating portion 945 may be a multiple of 2 or more of the other.

[0165] One of the number of the gears 952 of the second ratchet base portion 951 and the number of the gears 956 of the second ratchet rotating portion 955 may be a multiple of 2 or more of the other.

[0166] In this way, the number of gears in the ratchet base parts 941, 951 and the corresponding ratchet rotating parts 945, 955 can be set differently from the number of gears in another gear. Furthermore, designing in a manner that establishes a relationship of multiples and divisors of each other has many advantages in many aspects.

[0167] First, some gears are omitted from the ratchet base parts 941 and 951 and the ratchet rotating parts 945 and 955 corresponding thereto, which are members having shapes that are more difficult to be injection molded. This has the advantage that injection molding is easier.

[0168] In addition, when rotating in one direction, more precise operation can be achieved by maintaining the angle between two adjacent gears in a part with a large number of gears at a minimum angle, and by reducing the friction surface, the ratchet base parts 941, 951 and the corresponding ratchet rotating parts 945, 955 can be prevented from being pressed against each other.

[0169] More preferably, the number of the gears 946 of the first ratchet rotating part 945 may be twice the number of the gears 942 of the first ratchet base part 941. The number of the gears 956 of the second ratchet rotating part 955 may be twice the number of the gears 952 of the second ratchet base part 951 (see Figure 5 ).

[0170] The gears 946 of the first ratchet rotating portion 945 and the gears 956 of the second ratchet rotating portion 955 may be arranged in a ring at equal angular intervals.

[0171] In addition, if Figure 4 As shown, the second link member 920 is restricted in movement by the first ratchet member 940 and can only rotate toward the backrest surface 310 of the backrest portion 300 .

[0172] The backrest surface 310 may refer to a surface with which the back of the subject contacts among the outer surfaces of the backrest portion 300 .

[0173] like Figure 4 As shown, the third link member 930 is restricted from moving by the second ratchet member 950 and can only move in a direction rotatable with the second link member 920 ( Figure 4 The dotted arrow in the lower center indicates the direction of rotation.

[0174] Figure 6 It is a diagram for explaining the structure and operation of the release unit of the present invention.

[0175] like Figure 6 As shown in (a) of FIG. 1 , the release unit 960 may include a first release unit 970 and a second release unit 980 that operates independently of the first release unit 970 .

[0176] like Figure 6 As shown in (b), the first release portion 970 transmits an external force (towards Figure 6 (b) in the direction of the right arrow), thereby releasing the movement restriction state of the second link member 920.

[0177] The second release portion 980 transmits an external force to the second ratchet member 950 (towards Figure 6(b) in the direction of the left arrow), thereby releasing the movement restriction state of the third link member 930.

[0178] Figure 7 It is a front view (a) and a right side view (b) for explaining the appearance of the second link member after assembly of the present invention.

[0179] Reference Figure 7 The first release portion 970 may include a first button 971 and a first operating member 972 .

[0180] The first button 971 may be a structure protruding from an outer side surface of the second link member 920 for a user to apply an external force.

[0181] The first operating member 972 may be formed inside the second link member 920 .

[0182] The first operating member 972 may be supported by a first elastic member 973. The first elastic member 973 may be formed of a coil spring, a leaf spring, a torsion spring, or the like.

[0183] One end of the first elastic member 973 may be fixed to the first operating member 972 , and the other end of the first elastic member 973 may be fixed to a housing 921 forming an outer shape of the second link member 920 .

[0184] When the external force applied to the first button 971 is removed, the first elastic member 973 may return the first operating member 972 to its original position.

[0185] The first button 971 and the first ratchet rotating part 945 can be fixed on one side of the first operating member 972. When an external force is applied to the first button 971, the first operating member 972, the first button 971 and the first ratchet rotating part 945 move as a whole, so that the first ratchet rotating part 945 can be separated from the first ratchet base part 941. In this way, when they are separated, the movement restriction of the first link member 920 in one direction is released.

[0186] The second releasing portion 980 may have the same structure as that of the first releasing portion 970 .

[0187] The second release portion 980 may include a second button 981 and a second operating member 982 .

[0188] The second button 981 may be a structure protruding from an outer side surface of the second link member 920 for a user to apply an external force.

[0189] The second operating member 982 may be formed inside the second link member 920 .

[0190] The second operating member 982 may be supported by a second elastic member 983. The second elastic member 983 may be formed of a coil spring, a leaf spring, a torsion spring, or the like.

[0191] One end of the second elastic member 983 may be fixed to the second operating member 982 , and the other end of the second elastic member 983 may be fixed to the housing 921 forming the outer shape of the second link member 920 .

[0192] When the external force applied to the second button 981 is removed, the second elastic member 983 may return the second operating member 982 to its original position.

[0193] The second button 981 and the second ratchet rotating part 955 can be fixed on one side of the second operating member 982. When an external force is applied to the second button 981, the second operating member 982, the second button 981 and the second ratchet rotating part 955 move together, so that the second ratchet rotating part 955 can be separated from the second ratchet base part 951. In this way, when they are separated, the movement restriction in one direction of the third link member 930 is released.

[0194] Figure 8 2 is a diagram for explaining the shape of the second link member of the present invention. Figure 8 As shown, when viewed from the central axis direction of the first hinge pin 911, the surface 925 of the outer surface of the second link member 920 that becomes the front end when the second link member 920 rotates in the one direction is formed into a concave shape. That is, when viewed from the side of the headrest portion 600, the surface 925 that becomes the front end may be concavely formed in the direction of the surface that becomes the rear end.

[0195] Preferably, the front end surface 925 may be formed into a "C" shape when viewed from the side. More preferably, the front end surface 925 may be formed into an arc shape when viewed from the side.

[0196] The second link member 920 may be formed in a “C” shape as a whole. Preferably, the second link member 920 is formed in an arc shape.

[0197] As described above, the second link member 920 formed in a curved shape can easily move the headrest 610 to a position suitable for a subject of very short stature, such as a child.

[0198] Fig. 9 is a right side view of a connecting rod portion according to an embodiment of the present invention. As described above, Fig. 9 It may mean a state in which the headrest is positioned in a suitable position for the child.

[0199] exist Fig. 9 In the embodiment, each of the first link member 920 and the third link member 930 may be in a fully rotated state.

[0200] Fig. 9 In the embodiment, the headrest 610 is adjusted to a position suitable for the height of the child.

[0201] The curved shape of the second link member 920 can achieve a posture mode that can effectively support the head of a subject of short stature, such as a child.

[0202] from Figure 8 As can be seen from FIG. 1 , when the second link member 920 is simply formed into a straight line shape, the distance d′ between the end connected to the third link member 930 and the first link member 910 becomes larger.

[0203] At this time, when accommodating a short-statured subject such as a child, the subject's head leans forward too much, and therefore, it is not suitable as a headrest.

[0204] However, when the second link member 920 is formed in a curved shape as in the present invention, the distance d between the end portion to which the third link member 930 is connected and the first link member 910 can be appropriately maintained according to the body shape of a child.

[0205] like Fig. 9 As shown, when the first link member 910 is fixed to the backrest 300, the other end of the second link member 920, that is, the end connected to the third link member 930, can contact the backrest surface 310 of the backrest 300 through the rotation of the second link member 920 in the one direction. More preferably, through the rotation of the second link member 920 in the one direction, the other end can move forward to deform the backrest surface 310 after contacting the backrest surface 310. That is, it is buried in the backrest surface 310. As a result, the height (thickness) of the headrest 610 can be further reduced to be suitable for supporting the head of a child.

[0206] The backrest surface 310 may refer to a surface of the outer surface of the backrest portion 300 with which the back of the subject contacts.

[0207] When the second link member 920 is simply formed in a straight line shape, the end of the second link member 920 connected to the third link member 930 cannot contact the backrest surface 310 of the backrest portion 300 due to its structure.

[0208] In addition, if Figure 4As shown, the second link member 920 is restricted in movement by the first ratchet member 940 and can only rotate toward the backrest surface 310 of the backrest portion 300 .

[0209] The backrest surface 310 may refer to a surface with which the back of the subject contacts among the outer surfaces of the backrest portion 300 .

[0210] like Figure 4 As shown, the third link member 930 is restricted in movement by the second ratchet member 950, and can be rotated in the direction ( Figure 4 Rotates in the opposite direction to the direction indicated by the dotted arrow in the lower middle section.

[0211] As described above, by setting the shape of the recessed front end portion of the second link member 920 and the directions in which the second link member 920 and the third link member 930 can rotate freely, a user such as a doctor can hold the headrest 610 with only one hand to change from the adult headrest posture mode (see Figure 4 ) to the child headrest position mode (see Figure 6 ).

[0212] In addition, the movement restriction state of each of the second link member 920 and the third link member 930 is released by operating the release portion 960, so that the headrest posture mode for adults can be easily restored (see Figure 4 ).

[0213] Fig.10 1 and 2 are right side and rear views of a connecting rod portion according to an embodiment of the present invention.

[0214] like Fig.10 As shown, according to an embodiment of the present invention, at least one of the first release portion 970 and the second release portion 980 may include a button 981, and when an external force is applied, the button moves along a trajectory including the central axis of the first hinge pin 911 or the central axis of the second hinge pin 931 (see Fig.10 (b) in the direction of the arrow.

[0215] According to an embodiment of the present invention, the first release portion 970 may include a first button 971, and when an external force is applied, the first button releases the movement restriction state of the second link member 920. When an external force is applied, the second button may push at least a portion of the first ratchet member 940 to move along a trajectory including the central axis of the first hinge pin 911. When the first button 971 moves as described above, the meshing of the gears 942 and 946 of the first ratchet member 940 is released, so that the movement restriction state of the second link member 920 can be released.

[0216] More specifically, the first button 971 may be formed integrally with the first ratchet rotating portion 945. When an external force is applied to the first button 971, the first button 971 and the first ratchet rotating portion 945 move integrally, and the first ratchet rotating portion 945 may be separated from the first ratchet base portion 941. In this way, when they are separated, the movement restriction of the second link member 920 in one direction is released.

[0217] According to an embodiment of the present invention, the second release portion 980 may include a second button 981, and when an external force is applied, the second button releases the motion restriction state of the third link member 930. When an external force is applied, the second button may move while pushing at least a portion of the second ratchet member 950 along a trajectory including the central axis of the first hinge pin 911. While the second button 981 moves as described above, the meshing of the gears 952 and 956 of the second ratchet member 950 is released, so that the motion restriction state of the third link member 930 can be released.

[0218] More specifically, the second button 981 may be formed integrally with the second ratchet rotating portion 955. When an external force is applied to the second button 981, the second button 981 and the second ratchet rotating portion 955 move integrally, and the second ratchet rotating portion 955 may be separated from the second ratchet base portion 951. In this way, when they are separated, the movement restriction of the third link member 930 in one direction is released.

[0219] According to an embodiment of the present invention, the first release portion 970 may include a first button 971 and a first operating member 972. The first button 971 is formed protrudingly on an outer side surface of the second link member 920, and when an external force is applied, it does not include the central axis of the first hinge pin 911 and can move along a track parallel to the central axis of the first hinge pin 911. The first operating member 972 may be formed inside the second link member 920 and supported by a first elastic member 973. When an external force is applied, the first operating member 972 moves as a whole with the first button 971, and the meshing of the gears 942 and 946 of the first ratchet member 940 is released, thereby releasing the movement restriction state of the second link member 920.

[0220] According to an embodiment of the present invention, the second release portion 980 may include a second button 981 and a second operating member 982. The second button 981 is formed protrudingly on an outer side surface of the second link member 920, and when an external force is applied, it does not include the central axis of the second hinge pin 931 and can move along a track parallel to the central axis of the second hinge pin 931. The second operating member 982 may be formed inside the second link member 920 and supported by a second elastic member 983. When an external force is applied, the second operating member 982 moves integrally with the second button 981, and the meshing of the gears 952 and 956 of the second ratchet member 950 is released, thereby releasing the movement restriction state of the third link member 930.

[0221] Fig.11 It is a diagram for explaining the structure and operation of the release unit of the present invention.

[0222] like Fig.11 As shown in (a), the release unit 960 may include a first release unit 970. In addition, according to an embodiment, a second release unit 980 that operates independently of the first release unit 970 may be further included.

[0223] like Fig.11 As shown in (b), the first release portion 970 transmits an external force (towards the first ratchet member 940) to the first ratchet member 940. Fig.11 (b) the direction of the arrow shown on the upper left side), the movement restriction state of the second link member 920 can be released.

[0224] The second releasing portion 980 may transmit an external force to the second ratchet member 950 to release the movement restriction state of the third link member 930 .

[0225] The first ratchet member 940 may include a first ratchet base portion 941 and a first ratchet rotating portion 945 .

[0226] The first ratchet base portion 941 has a gear 942 on one side that is inclined in only one direction. The gears are arranged in a ring with the central axis of the first hinge pin 911 as the center and bulge toward the central axis. The opposite side of the one side can be fixed to the first connecting rod member 910.

[0227] Generally, gear teeth are formed into inclined surfaces corresponding to the two directions of rotation. Fig.11 As shown in the elliptical dotted line of (c), the gear 942 of the present invention can be formed as an inclined slope in one direction and formed at a right angle in the other direction.

[0228] The right angle in the present invention may mean a right angle in a practical sense rather than a right angle in a geometric sense.

[0229] The first ratchet rotating portion 945 may have a gear 946 formed on one surface thereof to mesh with the gear 942 of the first ratchet base portion 941. The opposite surface of the one surface may be fixed to the second link member 920.

[0230] By means of the structure in which the gears arranged in a ring mesh with each other, the force transmitted between the first ratchet rotating part 945 and the first ratchet base part 941 can be dispersed according to the number of gears. Therefore, the head of the subject can be supported with a stronger force, and the life of the first ratchet rotating part 945 and the first ratchet base part 941 can be extended to ensure durability.

[0231] Furthermore, the first ratchet rotating portion 945 and the first ratchet base portion 941 are formed of a synthetic resin material rather than metal and are manufactured by injection molding, thereby saving costs required for materials and processing.

[0232] The gear 946 may also be formed in a shape that is inclined in only one direction. Therefore, although the gears 942 and 946 can slide when the mutual force is transmitted to each inclined surface, they cannot slide when the mutual thrust is transmitted to the right-angled surface, and therefore, the first ratchet base portion 941 and the first ratchet rotating portion 945 cannot rotate relative to each other.

[0233] The second ratchet member 950 may be formed to be the same in structure as the first ratchet member 960 .

[0234] The second ratchet member 950 may include a second ratchet base portion 951 and a second ratchet rotating portion 955 .

[0235] The second ratchet base portion 951 has a gear 952 on one side thereof which is inclined in only one direction. The gear 952 is aligned with the center axis of the second hinge pin 931 ( Figure 4 The upper '+'-shaped center) is arranged in a plurality of rings at the center and bulges toward the central axis, and the opposite surface of the one surface can be fixed to the third connecting rod member 930.

[0236] The second ratchet rotating part 955 has a gear 955 formed on one surface thereof. The gear 955 meshes with the gear 952 of the second ratchet base part 951 , and the opposite surface of the one surface may be fixed to the second link member 920 .

[0237] The first release portion 970 may include a first deformable member whose shape or position changes with the application of external force. The applied external force may be transmitted to the first ratchet member 940 only when the change in shape or position of the first deformable member exceeds a predetermined first reference amount.

[0238] The first reference amount may be a reference for determining the amount of change of the first deformable member using a numerical value. In one embodiment, when the position of the first deformable member changes, it may mean a displacement value (distance) of a specific reference. In another embodiment, when the shape of the first deformable member changes, it may be a reference volume equivalent to the amount of shape change.

[0239] The first reference amount can be appropriately designed within a range less than the maximum value of the variation of the first deformation member. For example, it can be set to a value less than half of the maximum value. Preferably, it can be specified as a value equivalent to 70% to 80%. More preferably, it can be 75%.

[0240] In this way, when the first reference amount is set to a value smaller than half of the maximum value, the malfunction prevention effect of the first release unit 970 is increased.

[0241] The first release portion 970 may include a first button 971 and a first operating member 972 .

[0242] The first button 971 may be formed protrudingly on an outer side surface of the second link member 920 and is a structure for a user to apply external force.

[0243] The first operating member 972 may be formed inside the second link member 920 .

[0244] The first operating member 972 may be supported by a 1-1 elastic member 973. The first elastic member 973 may be formed of a coil spring, a leaf spring, a torsion spring, or the like.

[0245] One end of the 1-1st elastic member 973 is fixed to the first operating member 972 , and the other end of the first elastic member 973 may be fixed to a housing 921 forming an outer shape of the second link member 920 .

[0246] When the external force applied to the first button 971 is removed, the 1-1st elastic member 973 may return the first operating member 972 to its original position.

[0247] The first release portion 970 further includes a first operating member 972 formed inside the second link member 920 and supported by a 1-1 elastic member 973. The first deformation member may include a first button 971 protruding from an outer side surface of the second link member 920 and supported by a 1-2 elastic member 974 (see Fig.11 (a)) to (c)).

[0248] Only when an external force is applied to the first button 971 and the first button 971 moves more than the first reference displacement 975, the first operating member 972 transmits the applied external force to the first ratchet member 940 (see Fig.11 (c)).

[0249] When the first button 971 moves beyond the first reference displacement 975 as an external force is applied, the first operating member 972 may contact and move in conjunction with the first button 971 .

[0250] In this way, when the movement amount of the first button 971 is smaller than the first reference displacement 975 , no external force is transmitted to the first ratchet member 940 , and the movement restriction state of the second link member 920 continues.

[0251] Therefore, when the hand of a user such as a doctor mistakenly touches a key and applies a certain amount of external force, an erroneous operation in which the movement restriction state is released can be prevented.

[0252] In addition, a first protrusion 922 is formed inside the housing 921 of the second link member 920 and penetrates through a hole formed in the first operating member 972 . The outer wall of the first protrusion 922 guides the moving direction of the first operating member 972 .

[0253] Furthermore, a first guide groove 923 for guiding the moving direction of the first button 971 may be formed in the first protrusion 922 .

[0254] By configuring the first protrusion 922 in this way, the first protrusion 922 can guide the movement of the first operating member 972 and the first button 971 along an accurate trajectory.

[0255] In addition, the 1-2 elastic member 974 has one end connected to the first protrusion 922 and the other end connected to the first button 971 , supports the first button 971 , and is deformed according to the movement of the first button 971 .

[0256] When the external force is removed, the 1-2nd elastic member 974 is out of the deformed state, and performs the function of returning the first button 971 to its original position.

[0257] When an external force is applied to the first button 971 , the first operating member 972 moves together with the first button 971 and the first ratchet rotating portion 945 , so that the first ratchet rotating portion 945 can be separated from the first ratchet base portion 941 .

[0258] In this way, when the two elements are spaced apart, the restriction on the movement of the second link member 920 in one direction is released.

[0259] The second link member 920 may further include a second releasing portion 980 , which operates independently of the first releasing portion 970 to transmit an external force to the second ratchet member 950 to release the movement restriction state of the third link member 930 .

[0260] According to an embodiment of the present invention, the second releasing portion 980 may be formed in the same structure as the first releasing portion 970 .

[0261] The second release portion 980 may include a second deformation member whose shape or position changes as an external force is applied.

[0262] The second releasing portion 980 may be configured to transmit the applied external force to the second ratchet member 950 only when the amount of change in the shape or position of the second deforming member exceeds a predetermined second reference amount.

[0263] The second reference amount may have the same properties as the first reference amount, and may be set to the same value.

[0264] The second release portion 980 may further include a second operating member 982 formed inside the second link member 920 and supported by the 2-1st elastic member 983 .

[0265] The second operating member 982 may be formed inside the second link member 920 .

[0266] The second operating member 982 may be supported by a 2-1st elastic member 983. The 2-1st elastic member 983 may be formed of a coil spring, a leaf spring, a torsion spring, or the like.

[0267] One end of the 2-1st elastic member 983 is fixed to the second operating member 982 , and the other end of the 2-1st elastic member 983 may be fixed to the housing 921 forming the outer shape of the second link member 920 .

[0268] When the external force applied to the second button 981 is removed, the 2-1st elastic member 983 may return the second operating member 982 to its original position.

[0269] The second deformation member may include a second button 981 protruding from an outer side surface of the second link member 920 and supported by a 2-2 elastic member 984 .

[0270] The second button 981 can be a structure for a user to apply external force.

[0271] Only when an external force is applied to the second button 981 and the second button 981 moves beyond the second reference displacement, the second operating member 982 can transmit the applied external force to the second ratchet member 950 .

[0272] The second reference displacement may be set to the same value as the first reference displacement.

[0273] When the second button 981 moves beyond the second reference displacement 975 as an external force is applied, the second operating member 982 may contact and move in conjunction with the second button 981 .

[0274] In this way, when the movement amount of the second button 981 is smaller than the second reference displacement, no external force is transmitted to the second ratchet member 950 , and the movement restriction state of the third link member 930 continues.

[0275] Therefore, when the hand of a user such as a doctor mistakenly touches a key and applies a certain amount of external force, an erroneous operation in which the movement restriction state is released can be prevented.

[0276] In addition, a second protrusion 926 penetrating through a hole formed in the second operating member 982 is formed inside the housing 921 of the second link member 920 , and an outer wall of the second protrusion 926 can guide the moving direction of the second operating member 982 .

[0277] Furthermore, a second guide groove 927 for guiding the moving direction of the second button 981 may be formed in the second protrusion 926 .

[0278] By configuring the second protrusion 926 in this way, the second protrusion 926 can guide the movement of the second operating member 982 and the second button 981 along an accurate trajectory.

[0279] In addition, the 2-2 elastic member 984 has one end connected to the second protrusion 926 and the other end connected to the second button 981 , and supports the second button 981 , and can be deformed according to the movement of the second button 981 .

[0280] When the external force is removed, the 2-2nd elastic member 984 is out of the deformed state and returns the second button 981 to its original position.

[0281] When an external force is applied to the second button 981 , the second operating member 982 moves together with the second button 981 and the second ratchet rotating portion 955 , so that the second ratchet rotating portion 955 can be separated from the second ratchet base portion 951 .

[0282] In this way, when the third link member 930 is spaced apart, the restriction on the movement in one direction of the third link member 930 is released.

[0283] The first elastic member 973 may be formed by a coil spring surrounding the outer wall of the first protrusion 922 (see Fig.11 ).

[0284] The first-second elastic member 974 can be inserted into the first button 971. It can also be formed by a coil spring (see Fig.11 ).

[0285] The second first elastic member 983 may be formed by a coil spring surrounding the outer wall of the second protrusion 922 (see Fig.11 ).

[0286] The 2-2 elastic member 984 can be inserted into the first button 981. It can also be formed by a coil spring (see Fig.11 ).

[0287] Fig.12 It is a diagram for explaining the structure of a releasing unit according to an embodiment of the present invention.

[0288] like Fig.12 As shown in (a), the 1-1, 1-2, 2-1 and 2-2 elastic members may be formed on the Fig.11 The embodiments shown have different positions.

[0289] That is, the 1-1 elastic member and the 2-1 elastic member may be formed at positions that do not surround the corresponding protrusions 922 and 926 .

[0290] The 1-2 elastic member 974 may be inserted into the first guide groove 923 of the first protrusion 922. It may also be formed of a coil spring.

[0291] The 2-2 elastic member 984 may be inserted into the second guide groove 927 formed in the second raised portion 926. It may also be formed of a coil spring.

[0292] In addition, at least one of the first operating member 972 and the second operating member 982 may be hinged to the housing 921 . Fig.12 (a) shows an embodiment in which the first operating member 972 and the second operating member 982 share the third hinge pin 961 .

[0293] As described above, in an embodiment in which at least one of the first operating member 972 and the second operating member 982 is hinged to the shell 921, the shape of the first protrusion 922 or the second protrusion 926 is also preferably formed to correspond to the shape of the movement trajectory of the first operating member 972 and the second operating member 982.

[0294] As another example, Fig.12 As shown in (b), each end of the first operating member 972 and the second operating member 982 may be integrally fixed to the housing 921 .

[0295] In the embodiment, the first operating member 972 and the second operating member 982 may be formed as one body to form one operating member.

[0296] In addition, it can be formed of a material having elastic force (eg, carbon steel, plastic, etc.) and perform functions without the 1-1st elastic member 973 and the 2-1st elastic member 983. In the embodiment, the structure can be simplified and the cost can be saved.

[0297] On the one hand, the terms "first", "second", "third" and "fourth" in the specification and claims are used to distinguish between similar components, although not necessarily to describe a specific order or order of occurrence. Terms used in the same manner should be understood to be interchangeable under appropriate circumstances so that an embodiment of the present invention described herein can be performed in other orders not shown or described herein, for example. Similarly, when it is described herein as a method including a series of steps, the order of the steps disclosed herein is not necessarily the order in which the steps are performed, and any recorded steps may be omitted and / or any other steps not recorded herein may be added to the method.

[0298] In addition, the terms "left side", "right side", "front", "rear", "top", "bottom", "above", "below", etc. in this specification and the scope of the claims are used for explanation purposes and do not necessarily describe unchanged relative positions. Terms used in the same manner should be understood to be interchangeable under appropriate circumstances so that an embodiment of the present invention described herein can, for example, move in other directions not shown or described herein. The term "connected" used herein is defined as being directly or indirectly connected by electrical or non-electrical means. Objects recorded herein as being "adjacent" to each other may appropriately be objects that are in physical contact with each other or adjacent to each other or in the same general range or area as each other, depending on the article in which the sentence is used. The sentences "in one embodiment" present here refer to the same embodiment, but are not certain.

[0299] In addition, various variations of expressions such as "connected", "connected", "coupled", "coupled", "combined", and "combined" in the specification and claims are used to mean direct connection with other components or indirect connection through other components.

[0300] In addition, the suffixes "module" and "unit" of the constituent elements used in this specification are given or used interchangeably only for the convenience of writing the specification, and they themselves do not have mutually distinguishing meanings or functions.

[0301] In addition, the terms used in this specification are intended to illustrate the embodiments and are not intended to limit the present invention. In this specification, unless otherwise specified in the text, the singular includes the plural. The terms "consisting of" and / or "comprising" used in the specification shall not be interpreted as meaning that the constituent elements, steps and / or devices mentioned do not exclude the existence or addition of one or more other constituent elements, steps, actions and / or devices.

[0302] Although preferred embodiments of the present invention have been illustrated above, the present invention is not limited to the specific embodiments, and technicians in the field of the present invention can make various modifications within the scope of the gist of the present invention as claimed in the claims, and these modified embodiments should not be understood independently from the technical spirit or prospects of the present invention.

Claims

1. A treatment chair, comprising a connecting rod for adjusting the posture of a headrest, characterized in that: The connecting rod portion comprises: A first connecting rod member can be fixed to the backrest of the diagnosis and treatment chair; A second link member, one end of which is hinged to the first link member via a first hinge pin; A third link member, one end of which is hinged to the other end of the second link member through a second hinge pin and fixes the headrest on one side; a first ratchet member formed on one side of at least one of the first link member and the second link member, for limiting the movement of the second link member so that the second link member rotates in only one direction around the central axis of the first hinge pin; and a second ratchet member formed on one side of at least one of the second link member and the third link member, and used to limit the movement of the third link member so that the third link member rotates in only one direction around the central axis of the second hinge pin; The first ratchet member comprises: A first ratchet base portion, having a gear having a shape inclined in only one direction formed on one side, wherein a plurality of gears are arranged in a ring around the central axis of the first hinge pin and bulge in the direction of the central axis, and an opposite side is fixed to the first link member; and The first ratchet rotating part has a plurality of gears formed on one side, at least a portion of the gears meshing with at least a portion of the gears of the first ratchet base part, and an opposite side fixed to the second link member, The second link member is restricted in movement by the first ratchet member and can rotate only in the direction of the backrest surface of the backrest portion. The third link member is restricted from moving by the second ratchet member and is rotatable only in a direction opposite to a rotatable direction of the second link member.

2. The diagnostic and treatment chair according to claim 1, characterized in that: The second connecting rod member comprises: a first releasing portion capable of releasing the movement restriction state of the second link member by transmitting an external force to the first ratchet member; and The second releasing portion operates independently of the first releasing portion and can release the movement restriction state of the third link member by transmitting an external force to the second ratchet member.

3. The diagnosis and treatment chair according to claim 1, characterized in that: The second link member includes a first releasing portion, and the first releasing portion can release the movement restriction state of the second link member by transmitting an external force to the first ratchet member. The first ratchet member restricts the movement of the second link member so that the second link member rotates in only one direction around the central axis of the first hinge pin according to the meshing of the gear of the first ratchet base with the gear of the first ratchet rotating part. When an external force is applied, the first releasing portion releases the engagement of the first ratchet member to release the movement restricted state of the second link member.

4. The diagnosis and treatment chair according to claim 2, characterized in that: The second ratchet member comprises: A second ratchet base portion, having a gear having a shape inclined in only one direction formed on one side, wherein a plurality of gears are arranged in a ring around the central axis of the second hinge pin and bulge in the direction of the central axis, and the opposite side is fixed to the third link member; and The second ratchet rotating part has a plurality of gears formed on one surface, at least a portion of the gears meshing with at least a portion of the gears of the second ratchet base portion, and an opposite surface fixed to the second link member.

5. The diagnosis and treatment chair according to claim 1, characterized in that: The second link member includes a first release portion, and the first release portion can release the movement restriction state of the second link member by transmitting an external force to the first ratchet member. The first releasing unit comprises: A first button protruding from an outer side surface of the second link member for applying an external force; and The first operating member is formed inside the second connecting rod member and supported by the first elastic member. The first button and the first ratchet rotating part are fixed on one side of the first operating member. When an external force is applied to the first button, the first operating member moves together with the first button and the first ratchet rotating part to separate the first ratchet rotating part from the first ratchet base part.

6. The diagnosis and treatment chair according to claim 1, characterized in that: Each of the gears of the first ratchet base portion and the first ratchet rotating portion forms an inclination angle of 40 degrees or more and 50 degrees or less in only one direction with respect to the surface on which the gears are formed.

7. The diagnosis and treatment chair according to claim 6, characterized in that: The inclination angle is 45 degrees.

8. The diagnosis and treatment chair according to claim 6, characterized in that: One of the number of gears of the first ratchet base portion and the number of gears of the first ratchet rotating portion is a multiple of 2 or more of the other.

9. The diagnosis and treatment chair according to claim 8, characterized in that: The number of gears of the first ratchet rotating part is twice the number of gears of the first ratchet base part.

10. The diagnosis and treatment chair according to claim 9, characterized in that: The plurality of gear teeth of the first ratchet rotating part are arranged in a ring shape at equal angular intervals.

11. The diagnostic and treatment chair according to claim 4, characterized in that: The second releasing unit includes: A second button protruding from an outer side surface of the second link member for applying an external force; and The second operating member is formed inside the second connecting rod member and supported by the second elastic member. The second button and the second ratchet rotating part are fixed on one side of the second operating member. When an external force is applied to the second button, the second operating member moves as a whole with the second button and the second ratchet rotating part to separate the second ratchet rotating part from the second ratchet base part.

12. The diagnosis and treatment chair according to claim 1, characterized in that: When viewed from the center axis direction of the first hinge pin, a surface of the outer surface of the second link member that becomes a leading end when the second link member rotates in the one direction is formed in a concave shape.

13. The diagnosis and treatment chair according to claim 12, characterized in that: When the first link member is fixed to the backrest portion, the other end portion of the second link member, rather than the one end portion, may contact the backrest surface of the backrest portion by the rotation of the second link member in the one direction.

14. A diagnosis and treatment chair, comprising a connecting rod portion for adjusting the posture of a headrest, characterized in that: The connecting rod portion comprises: A first connecting rod member can be fixed to the backrest of the diagnosis and treatment chair; A second link member, one end of which is hinged to the first link member via a first hinge pin; A third link member, one end of which is hinged to the other end of the second link member through a second hinge pin and fixes the headrest on one side; A first ratchet member formed on one side of at least one of the first link member and the second link member, for limiting the movement of the second link member so that the second link member rotates in only one direction around the central axis of the first hinge pin according to the meshing of the inclined gears disposed opposite to each other; and A second ratchet member is formed on one side of at least one of the second link member and the third link member, and is used to limit the movement of the third link member so that the third link member can rotate in only one direction with the central axis of the second hinge pin as the center according to the meshing of the inclined gears arranged facing each other. The second link member includes a releasing portion that releases the movement restriction state of the second link member by applying an external force to the first ratchet member. The second link member is restricted in movement by the first ratchet member and can rotate only in the direction of the backrest surface of the backrest portion. The third link member is restricted from moving by the second ratchet member and is rotatable only in a direction opposite to a rotatable direction of the second link member.

15. The diagnosis and treatment chair according to claim 14, characterized in that: The release unit comprises: a first releasing portion capable of releasing the movement restriction state of the second link member by transmitting an external force to the first ratchet member; and The second releasing portion operates independently of the first releasing portion and can release the movement restriction state of the third link member by transmitting an external force to the second ratchet member.

16. The diagnosis and treatment chair according to claim 15, characterized in that: When an external force is applied, the first releasing portion releases the movement restriction state of the second link member by releasing the meshing of the gear of the first ratchet member. When an external force is applied, the second releasing portion releases the movement restricted state of the third link member by releasing the meshing of the gear of the second ratchet member.

17. The diagnostic and treatment chair according to claim 15 or 16, characterized in that: The first ratchet member comprises: A first ratchet base portion, having a gear having a shape inclined in only one direction formed on one side, wherein a plurality of gears are arranged in a ring around the central axis of the first hinge pin and bulge in the direction of the central axis, and an opposite side is fixed to the first link member; and The first ratchet rotating part has a plurality of gears formed on one side, at least a portion of the gears meshing with at least a portion of the gears of the first ratchet base part, and an opposite side fixed to the second link member, The second ratchet member comprises: A second ratchet base portion, having a gear having a shape inclined in only one direction formed on one side, wherein a plurality of gears are arranged in a ring around the central axis of the second hinge pin and bulge in the direction of the central axis, and the opposite side is fixed to the third link member; and The second ratchet rotating part has a plurality of gears formed on one surface, at least a portion of the gears meshing with at least a portion of the gears of the second ratchet base portion, and an opposite surface fixed to the second link member.

18. The diagnosis and treatment chair according to claim 17, characterized in that: Each gear of the first ratchet base portion, the first ratchet rotating portion, the second ratchet base portion, and the second ratchet rotating portion forms an inclination angle of 40 degrees or more and 50 degrees or less in only one direction with respect to the surface on which the gear is formed.

19. The diagnosis and treatment chair according to claim 18, characterized in that: The inclination angle is 45 degrees.

20. The diagnosis and treatment chair according to claim 17, characterized in that: One of the number of gears of the first ratchet base portion and the number of gears of the first ratchet rotating portion is a multiple of 2 or more of the other, One of the number of gears of the second ratchet base portion and the number of gears of the second ratchet rotating portion is a multiple of 2 or more of the other.

21. The diagnosis and treatment chair according to claim 20, characterized in that: The number of gears of the first ratchet rotating part is twice the number of gears of the first ratchet base part. The number of gears of the second ratchet rotating portion is twice the number of gears of the second ratchet base portion.

22. The diagnosis and treatment chair according to claim 21, characterized in that: The gears of the first ratchet rotating part and the gears of the second ratchet rotating part are arranged in a ring at equal angular intervals.

23. The diagnosis and treatment chair according to claim 17, characterized in that: The first releasing unit comprises: A first button protruding from an outer side surface of the second link member for applying an external force; and The first operating member is formed inside the second link member and supported by the first elastic member. The first button and the first ratchet rotating part are fixed on one side of the first operating member. When an external force is applied to the first button, the first operating member moves together with the first button and the first ratchet rotating part so that the first ratchet rotating part is separated from the first ratchet base part. The second releasing unit includes: A second button protruding from an outer side surface of the second link member for applying an external force; and The second operating member is formed inside the second connecting rod member and supported by the second elastic member. The second button and the second ratchet rotating part are fixed on one side of the second operating member. When an external force is applied to the second button, the second operating member moves as a whole with the second button and the second ratchet rotating part to separate the second ratchet rotating part from the second ratchet base part.

24. The diagnosis and treatment chair according to claim 14, characterized in that: When viewed from the center axis direction of the first hinge pin, a surface of the outer surface of the second link member that becomes a leading end when the second link member rotates in the one direction is formed in a concave shape.

25. The diagnosis and treatment chair according to claim 15, characterized in that: The second link member is formed in a "C" shape.

26. The diagnosis and treatment chair according to claim 15, characterized in that: When the first link member is fixed to the backrest portion, the other end portion of the second link member may contact the backrest surface of the backrest portion through the rotation of the second link member in the one direction.

27. The diagnosis and treatment chair according to claim 15, characterized in that: At least one of the first release portion and the second release portion includes a button, and when an external force is applied, the button moves along a trajectory including a central axis of the first hinge pin or a central axis of the second hinge pin.

28. The diagnosis and treatment chair according to claim 27, characterized in that: The second release portion includes a second button. When an external force is applied, the button pushes at least a portion of the second ratchet member to move along a trajectory including the central axis of the first hinge pin to release the engagement of the gear of the second ratchet member, thereby releasing the movement restriction state of the third link member.

29. The diagnosis and treatment chair according to claim 28, characterized in that: The first releasing unit comprises: a first button protrudingly formed on an outer side surface of the second link member, and moving along a trajectory excluding the central axis of the first hinge pin and parallel to the central axis of the first hinge pin when an external force is applied; and The first operating member is formed inside the second link member and supported by the first elastic member. When an external force is applied, the first operating member moves integrally with the first button to release the meshing of the gear of the first ratchet member, thereby releasing the movement restriction state of the second link member.

30. A diagnosis and treatment chair, comprising a connecting rod portion for adjusting the posture of a headrest, characterized in that: The connecting rod portion comprises: A first connecting rod member can be fixed to the backrest of the diagnosis and treatment chair; A second link member, one end of which is hinged to the first link member via a first hinge pin; A third link member, one end of which is hinged to the other end of the second link member through a second hinge pin and fixes the headrest on one side; a first ratchet member formed on one side of at least one of the first link member and the second link member, restricting movement of the second link member so that the second link member rotates in only one direction around the central axis of the first hinge pin; and A second ratchet member is formed on one side of at least one of the second link member and the third link member, and restricts the movement of the third link member so that the third link member rotates in only one direction around the central axis of the second hinge pin. The second link member includes a first releasing portion that releases the movement restriction state of the second link member by transmitting an external force to the first ratchet member. The first release portion includes a first deformable member whose shape or position changes as an external force is applied, and transmits the applied external force to the first ratchet member only when the amount of change in the shape or position of the first deformable member exceeds a predetermined first reference amount. The second link member is restricted in movement by the first ratchet member and can rotate only in the direction of the backrest surface of the backrest portion. The third link member is restricted from moving by the second ratchet member and is rotatable only in a direction opposite to a rotatable direction of the second link member.

31. The diagnosis and treatment chair according to claim 30, characterized in that: The first release portion further includes a first operating member formed inside the second link member and supported by the 1-1 elastic member. The first deformation member includes a first button protruding from an outer side surface of the second link member and supported by the first-second elastic member. As an external force is applied to the first button, the first operating member transmits the applied external force to the first ratchet member only when the first button moves beyond a first reference displacement.

32. The diagnosis and treatment chair according to claim 31, characterized in that: When the first button moves beyond the first reference displacement as an external force is applied, the first operating member contacts and moves in conjunction with the first button.

33. The diagnosis and treatment chair according to claim 32, characterized in that: A first protrusion is formed inside the housing of the second link member and penetrates through a hole formed in the first operating member. An outer wall of the first raised portion guides a moving direction of the first operating member.

34. The diagnosis and treatment chair according to claim 33, characterized in that: A first guide groove for guiding a moving direction of the first button is formed in the first raised portion.

35. The diagnosis and treatment chair according to claim 33, characterized in that: The 1-2 elastic member has one end connected to the first protrusion and the other end connected to the first button to support the first button and deform according to the movement of the first button.

36. The diagnosis and treatment chair according to claim 32, characterized in that: The first ratchet member comprises: A first ratchet base portion, having a gear having a shape inclined in only one direction formed on one side, wherein a plurality of gears are arranged in a ring around the central axis of the first hinge pin and bulge in the direction of the central axis, and the opposite side is fixed to the first link member; and The first ratchet rotating part has a gear meshing with the gear of the first ratchet base part formed on one side, and the opposite side is fixed to the first link member. When an external force is applied to the first button, the first operating member moves together with the first button and the first ratchet rotating portion so that the first ratchet rotating portion is separated from the first ratchet base portion.

37. The diagnosis and treatment chair according to claim 30 or 31, characterized in that: The second link member further includes a second release portion, which operates independently of the first release portion and transmits an external force to the second ratchet member to release the movement restriction state of the third link member. The second release portion includes a second deforming member whose shape or position changes as an external force is applied, and transmits the applied external force to the second ratchet member only when the amount of change in shape or position of the second deforming member exceeds a predetermined second reference amount.

38. The diagnosis and treatment chair according to claim 37, characterized in that: The second release portion further includes a second operating member formed inside the second link member and supported by the 2-1 elastic member. The second deformation member includes a second button protruding from an outer side surface of the second link member and supported by a 2-2 elastic member. As an external force is applied to the second button, the second operating member transmits the applied external force to the second ratchet member only when the second button moves beyond a second reference displacement.

39. The diagnosis and treatment chair according to claim 38, characterized in that: When the second button moves beyond the second reference displacement as an external force is applied, the second operating member contacts and links with the second button. The second ratchet member comprises: A second ratchet base portion, having a gear having a shape inclined in only one direction formed on one side, wherein a plurality of gears are arranged in a ring around the central axis of the second hinge pin and bulge in the direction of the central axis, and the opposite side is fixed to the third link member; and The second ratchet rotating part has a gear formed on one side to mesh with the gear of the second ratchet base part, and an opposite side fixed to the second link member. When an external force is applied to the second button, the second operating member moves together with the second button and the second ratchet rotating portion so that the second ratchet rotating portion is separated from the second ratchet base portion.

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