Dental unit chair

Abstract

One embodiment of the present invention provides a dental unit chair comprising: a chair unit on which an examinee can sit or lie; and an armrest assembly coupled to the chair unit. The armrest assembly comprises: a support mount which is coupled to the chair unit; a rotary shaft which is coupled to the support mount and is rotated from the support mount; an armrest body part which is coupled to the rotary shaft and on which an arm of the examinee is mounted; and a rotation control part for controlling rotation of the armrest body part, wherein the rotary shaft has a rotation guide hole to which a first guide hole formed in the longitudinal direction of the rotary shaft and a second guide hole formed in the circumferential direction of the rotary shaft are connected, and the rotation or rotational locking of the armrest body part is selectively performed depending on the position of the rotation control part inserted through the rotation guide hole.

Description

Dental unit chair

[0001] The present invention relates to a dental unit chair, and more particularly, to a dental unit chair having an armrest assembly having a simple structure and being designed for easy operation.

[0002] Typically, dental treatment is performed while the patient lies down in a dental unit chair.

[0003] These dental unit chairs may be equipped with lighting to illuminate the oral cavity, a doctor's table equipped with various treatment tools, a monitor displaying information about the oral cavity and CT images, a monitor arm supporting the monitor, and an armrest for the patient's arm. This allows the patient to comfortably rest their arm on the armrest during treatment, allowing them to receive dental treatment in a psychologically stable state. Furthermore, when the patient needs to stand up from a lying position in the dental unit chair, they can easily do so by holding onto the armrest.

[0004] Such armrests are designed to be rotatable, so that, for example, the patient can sit or lie down on the dental unit chair with the armrest rotated to the anti-jamming position.

[0005] However, the armrests provided in conventional dental unit chairs are difficult and complex to rotate, interfering with dental procedures. Due to these issues, some dental clinics force the armrests to be removed from the unit chair, eliminating their use.

[0006] Accordingly, various research and developments are being conducted on dental unit chairs with armrests designed for easy operation.

[0007] The technical problem of the present invention to solve the above problems is to provide a dental unit chair having an armrest assembly having a simple structure and being easy to operate.

[0008] In order to achieve the above technical problem, one embodiment of the present invention provides a dental unit chair including: a chair portion on which a patient can sit or lie; and an armrest assembly coupled to the chair portion; wherein the armrest assembly includes: a support mount coupled to the chair portion; a rotation shaft coupled to the support mount and rotated from the support mount; an armrest body portion coupled to the rotation shaft and on which the patient's arm is placed; and a rotation control portion controlling the rotation of the armrest body portion, wherein the rotation shaft has a rotation guide hole formed therein, in which a first guide hole formed in the longitudinal direction of the rotation shaft and a second guide hole formed in the circumferential direction of the rotation shaft are connected, and rotation or rotation locking of the armrest body portion is selectively performed depending on the position of the rotation control portion inserted through the rotation guide hole.

[0009] In one embodiment of the present invention, the support mount includes: a base coupled to the chair portion; and a boss portion protruding from the base and having a shaft insertion hole formed therein into which the rotation shaft is inserted; and a through hole through which the rotation control portion is inserted may be formed in the boss portion.

[0010] In one embodiment of the present invention, the armrest assembly further includes: a rod that is inserted into a rod hollow hole formed in the rotary shaft and has a fastening hole formed therein; an elastic member whose one end is supported on a support surface formed inside the rotary shaft and whose other end is supported on a step surface of the rod; a shaft cover that is disposed on the outside of the rotary shaft and protects the rotary shaft from the outside; and a push button that is coupled to an end of the rod; wherein an end of the rotation control unit is coupled to the fastening hole while being inserted through the through hole and the rotation guide hole, and the armrest body unit can be coupled to an end of the rotary shaft.

[0011] In one embodiment of the present invention, the armrest body part is released from rotation lock by one-touch pressing of the push button, and can rotate itself to a rotation stop position by its own weight.

[0012] In one embodiment of the present invention, the boss portion is formed with the through hole of the long hole corresponding to the first guide hole, so that the rotation control portion can move along the longitudinal direction of the through hole during the pressing process of the push button.

[0013] In one embodiment of the present invention, the first guide hole may be configured to guide axial movement of the rod, and the second guide hole may be configured to guide rotation of the armrest body.

[0014] In one embodiment of the present invention, when the rotation control unit is moved to a rotation unlocking position where the first guide hole and the second guide hole are connected, the rotation lock of the armrest body is released, and the armrest body can be rotated by its own weight while being guided by the second guide hole.

[0015] In one embodiment of the present invention, the armrest body part is provided with a partition that divides a first receiving groove and a second receiving groove, an end of the rotary shaft is integrally connected to the armrest body part by a fastening member while being inserted into the first receiving groove formed on one side of the armrest body part, and the push button is connected to the rod while being inserted into the second receiving groove formed on the other side of the armrest body part, and the second receiving groove may be configured to guide the movement direction of the push button.

[0016] In one embodiment of the present invention, the load may include: a load body in which the fastening hole is formed; a first protrusion protruding from one end of the load body and preventing the elastic member from being detached during the stretching process of the elastic member; and a second protrusion protruding from the other end of the load body and inserted into and coupled to a first button engaging groove formed in the push button.

[0017] In one embodiment of the present invention, the center of gravity of the armrest body may be formed in the first region on the front side based on an imaginary vertical line passing through the coupling axis of the armrest body part coupled to the support mount based on the armrest assembly in the rotationally locked state.

[0018] In one embodiment of the present invention, the angle between the virtual vertical line and the virtual connecting line connecting the center of gravity of the armrest body and the coupling axis may be 14 to 16°.

[0019] The effects of the dental unit chair according to the present invention described above are as follows.

[0020] According to the present invention, the armrest body can be automatically rotated to a rotation stop position with just one touch of a push button. The rotation shaft is formed with a first guide hole formed in the longitudinal direction of the rotation shaft and a second guide hole formed in the circumferential direction of the rotation shaft, so that when the rotation control unit is moved to an unlocked position where the first guide hole and the second guide hole are connected by pressing the push button, the armrest body can be rotated by itself from the support mount by its own weight. Such a dental unit chair has a simple structure, and the armrest body can be rotated easily.

[0021] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0022] FIG. 1 is a perspective view of a dental unit chair according to one embodiment of the present invention.

[0023] Figure 2 is a perspective view of an armrest assembly according to one embodiment of the present invention.

[0024] Figure 3 is an exploded perspective view of an armrest assembly according to one embodiment of the present invention.

[0025] Figure 4 is a cross-sectional view taken along line AA of Figure 2.

[0026] FIG. 5 is a perspective view of a support mount viewed from one side and the other side according to one embodiment of the present invention.

[0027] Figure 6 is a perspective view of a rotating shaft viewed from one side and the other side according to one embodiment of the present invention.

[0028] Figure 7 is a perspective view of a rod according to one embodiment of the present invention.

[0029] Fig. 8 is an exemplary diagram schematically showing the center of gravity of an armrest body according to one embodiment of the present invention.

[0030] FIG. 9 is an exploded perspective view of a rotary shaft, an elastic member, a rod, an armrest body, and a push button viewed from one side according to one embodiment of the present invention.

[0031] FIG. 10 is an exploded perspective view of a rotating shaft, an elastic member, a rod, an armrest body, and a push button as viewed from the other side according to one embodiment of the present invention.

[0032] Fig. 11 is an exemplary drawing showing a damper part coupled to a support mount according to one embodiment of the present invention.

[0033] Fig. 12 is an operational example schematically showing a process in which an armrest body part rotates according to pressing of a push button according to one embodiment of the present invention.

[0034] Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar parts have been designated with similar reference numerals throughout the specification.

[0035] Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "indirectly connected" with other elements intervening. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that the other components may be included, unless otherwise specifically stated.

[0036] In the present invention, upper and lower parts mean being located above or below the target member, but do not necessarily mean being located above or below with respect to the direction of gravity.

[0037] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0038] FIG. 1 is a perspective view of a dental unit chair according to an embodiment of the present invention, FIG. 2 is a perspective view of an armrest assembly according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of an armrest assembly according to an embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line AA of FIG. 2, FIG. 5 is a perspective view of a support mount as viewed from one side and the other side according to an embodiment of the present invention, FIG. 6 is a perspective view of a rotary shaft as viewed from one side and the other side according to an embodiment of the present invention, FIG. 7 is a perspective view of a rod as viewed from an embodiment of the present invention, FIG. 8 is an exemplary diagram schematically showing the center of gravity of an armrest body as viewed from an embodiment of the present invention, FIG. 9 is an exploded perspective view of a rotary shaft, an elastic member, a rod, an armrest body and a push button as viewed from one side according to an embodiment of the present invention, and FIG. 10 is a perspective view of a rotary shaft as viewed from the other side according to an embodiment of the present invention, This is an exploded perspective view of an elastic member, a load, an armrest body, and a push button, and FIG. 11 is an exemplary view showing a damper part coupled to a support mount according to an embodiment of the present invention, and FIG. 12 is an operational diagram schematically showing a process in which the armrest body part rotates according to pressing of a push button according to an embodiment of the present invention.

[0039] As shown in FIGS. 1 to 12, the dental unit chair (3000) may include an armrest assembly (1000) and a chair portion (2000).

[0040] The chair part (2000) is configured so that the patient can sit or lie down. Various switches may be provided on the chair part (2000), and the practitioner (doctor) may adjust the angle of the chair part (2000) at which the patient can sit or lie down by operating the switches provided on the chair part (2000).

[0041] The armrest assembly (1000) is connected to each side of the chair section (2000). The armrest body section (600) provided in the armrest assembly (1000) can be used to place the patient's arm. This allows the patient to feel psychologically secure during the dental treatment process.

[0042] Such an armrest assembly (1000) may include a support mount (100), a rotation shaft (200), a rod (300), an elastic member (400), a rotation control unit (500), an armrest body unit (600), a shaft cover (700), a push button (800), and a damper unit (900).

[0043] The support mount (100) is fixedly installed on the chair part (2000). The support mount (100) includes a base (110) and a boss part (120), and is configured to support the armrest body part (600).

[0044] The base (110) can be integrally connected to the chair portion (2000) by a fastening member such as a bolt. In addition, the boss portion (120) protrudes from the base (110), and a shaft insertion hole (121) into which a rotating shaft (200) is inserted is formed in the center of the boss portion (120).

[0045] A separation prevention member (122) is provided on the inside of the shaft insertion hole (121), so that the rotary shaft (200) inserted into the shaft insertion hole (121) is prevented from being separated by the separation prevention member (122). Here, a coupling guide hole (123) is formed in the separation prevention member (122) through which a pair of fastening members (210) provided on the front (front) of the rotary shaft (200) are inserted, so that the rotary shaft (200) and the support mount (100) can be coupled by the rotation of the rotary shaft (200) while the fastening members (210) are inserted through the coupling guide holes (123).

[0046] If we briefly look at the initial coupling process of the rotating shaft (200) and the support mount (100), first, the fastening member (210) provided on the front side of the rotating shaft (200) is inserted through the coupling guide hole (123). Then, the rotating shaft (200) is rotated to position the fastening member (210) so that it is caught by the detachment prevention member (122). Then, the rotation control unit (500) is coupled to the fastening hole (301) formed in the rod (300) to assemble the rotating shaft (200) so that it does not detach from the support mount (100). Here, when the rotation control unit (500) is inserted through the through hole (124) formed in the boss unit (120) and the rotation guide hole (203) formed in the rotation shaft (200) and is coupled to the fastening hole (301) of the rod (300) provided inside the rotation shaft (200), even if the armrest body unit (600) rotates within a predetermined rotation range, the rotation shaft (200) is prevented from being separated from the support mount (100) due to the occurrence of an engagement with the separation prevention unit (122). That is, unless the rotation control unit (500) is directly separated from the rod (300), the fastening unit (210) is prevented from being separated through the coupling guide hole (123).

[0047] Specifically, a virtual first horizontal line (L1) passing through a first guide hole (201) formed in a rotating shaft (200) is formed to pass through the center positions of a pair of spaced-apart fastening members (210), and a virtual second horizontal line (L2) passing through the other end of a second guide hole (202) formed in a rotating shaft (200) is formed to pass through one of the fastening members (210). In this way, since the rotation guide hole (203) and the fastening member (210) are formed at a pre-designated position through the virtual first horizontal line (L1) and the virtual second horizontal line (L2), even if the armrest body part (600) is rotated within the rotation radius in a state where the initial coupling of the rotating shaft (200) and the support mount (100) is achieved (i.e., a state where the rotation control part is coupled to the fastening hole of the rod), the fastening member (210) is prevented from being separated to the outside through the coupling guide hole (123). Since this armrest assembly (1000) is provided with a detachment prevention member (122) on the support mount (100) and a fastening member (210) on the rotary shaft (200), the initial coupling of the rotary shaft (200) and the support mount (100) can be easily achieved.

[0048] And, a through hole (124) is formed in the boss part (120) through which the rotation control part (500) is inserted. Here, the through hole (124) has a long hole shape, and can be formed to correspond to the first guide hole (201) formed in the rotation shaft (200).

[0049] Meanwhile, the front side of the rotary shaft (200) is inserted into the shaft insertion hole (121) and is configured to be rotatable from the support mount (100). That is, the rotary shaft (200) is configured to be rotatable from the support mount (100) fixedly installed on the chair part (2000).

[0050] And a rotation guide hole (203) is formed in the rotation shaft (200). This rotation guide hole (203) guides the rotation of the armrest body (600) when the armrest body (600) rotates. This rotation guide hole (203) has a form in which a first guide hole (201) and a second guide hole (202) are connected. For example, the first guide hole (201) and the second guide hole (202) can be connected in an 'ㄱ' shape.

[0051] Here, the first guide hole (201) may be formed in the longitudinal direction of the rotation shaft (200), and the second guide hole (202) may be formed in the circumferential direction of the rotation shaft (200). This first guide hole (201) guides the axial movement of the rod (300). For example, the first guide hole (201) guides the movement of the rotation control unit (500) so that the rotation control unit (500) positioned in a rotationally locked state moves to the rotation point.

[0052] And the second guide hole (202) guides the rotation of the armrest body (600) so that the armrest body (600) rotates by itself to a rotation stop position by its own weight when the rotation control unit (500) is moved to the rotation point. The rotation operation of the armrest body (600) will be described in detail later.

[0053] A rod hollow hole (204) is formed in the center of the rotating shaft (200), and a rod (300) is inserted into the rod hollow hole (204). Here, a fastening hole (301) is formed in the rod (300) to be fastened to the end of the rotation control unit (500).

[0054] Meanwhile, the rotation control unit (500) is configured to control the rotation of the armrest body (600) when the push button (800) is pressed. This rotation control unit (500) may be formed, for example, in the form of a bolt having a head (510) and a screw joint (520). In this rotation control unit (500), the rotation shaft (200) is inserted into the shaft insertion hole (121) formed in the boss (120), and the rod (300) is inserted into the rod hollow hole (204) formed in the rotation shaft (200), and the end of the rotation control unit (500), i.e., the screw joint (520), can be screw-joined with the fastening hole (301) formed in the rod (300). That is, the rotation control unit (500) is connected to the fastening hole (301) of the rod (300) while being inserted through the through hole (124) formed in the boss unit (120) and the rotation guide hole (203) formed in the rotation shaft (200). Here, the head unit (510) provided in the rotation control unit (500) may be formed larger than the through hole (124).

[0055] Meanwhile, the elastic member (400) is configured to elastically support the rod (300). The elastic member (400) may be a spring. One end of the elastic member (400) is configured to be supported on a support surface (205) formed inside the rotary shaft (200), and the other end is configured to be supported on a step surface (311) of the rod (300). The elastic member (400) is compressed when a force greater than a certain level is applied to the rod (300) and the rod (300) moves forward. That is, when a force greater than a certain level is applied to the rod (300) and the rod (300) moves forward, the rotation control unit (500) coupled to the rod (300) can move along the longitudinal direction of the through hole (124) formed in the boss unit (120) and the first guide hole (201) formed in the rotary shaft (200). Conversely, when the force applied to the load (300) is released, the load (300) moves to its original position by the restoring force of the elastic member (400).

[0056] Meanwhile, the armrest body (600) on which the subject's arm is placed is connected to an end of a rotating shaft (200). This armrest body (600) is connected integrally with the rotating shaft (200), so that when the armrest body (600) rotates, the rotating shaft (200) rotates together with the armrest body (600).

[0057] Referring to FIG. 8, in a locked state where the rotation of the armrest body (600) is prevented, that is, the rotation control unit (500) is positioned at the first position (P1, see FIG. 6) and the rotation of the armrest body (600) is prevented, the center of gravity (G) of the armrest body (600) is formed in a first area (A1) that is the front side based on an imaginary vertical line (V) passing through the coupling axis (J) of the armrest body (600) coupled to the support mount (100). In this way, as the center of gravity (G) of the armrest body (600) is located in the first area (A1), the load (300) moves forward by pressing the push button (800), and the rotation control unit (500) coupled to the load (300) is moved to the rotation unlocking position, which is the second position (P2, see FIG. 6) where the first guide hole (201) and the second guide hole (202) are connected, so that the armrest body (600) can rotate by itself from the support mount (100) by its own weight. In this process of rotating the armrest body (600), the armrest body (600) rotates while being guided by the second guide hole (202) formed along the circumference of the rotation shaft (200).

[0058] The center of gravity (G) of the armrest body (600) is preferably formed such that, for example, the angle (α) between the imaginary vertical line (V) and the imaginary connecting line (I) connecting the center of gravity (G) of the armrest body (600) and the joining axis (J) of the armrest body (600) forms 14 to 16°. In addition, the center of gravity (G) of the armrest body (600) is preferably positioned at a point where the horizontal distance (D) is 30 to 40 mm from the imaginary vertical line (V).

[0059] In this way, the position of the center of gravity (G) formed by the armrest body part (600) forming an elliptical curved surface affects the rotation speed of the armrest body part (600) rotated by its own weight. For example, if the angle (α) between the virtual vertical line (V) and the connecting line (I) is less than 13°, there is a problem that the rotation speed of the armrest body part (600) rotated by its own weight is too slow, and if the angle (α) between the virtual vertical line (V) and the connecting line (I) exceeds 16°, the rotation speed of the armrest body part (600) rotated by its own weight is too fast, and noise may be generated due to collision between mechanisms at the point where the armrest body part (600) stops. Accordingly, the armrest body (600) forms the center of gravity (G) of the armrest body (600) so that the angle (α) between the virtual vertical line (V) and the connecting line (I) is 14 to 16°, thereby rotating the armrest body (600) at the required rotational speed, and at the same time, preventing the occurrence of impact noise due to collision between mechanisms during the process of stopping the armrest body (600).

[0060] Meanwhile, in a state where no external force is applied to the rod (300), that is, in a state where the rod (300) is elastically supported by the elastic restoring force of the elastic member (400), or in a state where an external force is applied to the rod (300) but the rotation control unit (500) does not reach the second position (P2) where the first guide hole (201) and the second guide hole (202) are connected and remains at the first position (P1), even if a rotational force due to the center of gravity (G) of the armrest body (600) is provided to the rotation shaft (200), the rotation shaft (200) is caught by the rotation control unit (500), and thus the rotation shaft (200) cannot rotate. In this way, the rotationally locked position where the rotation shaft (200) cannot rotate is a state where the rotation control unit (500) is positioned at the first position (P1).

[0061] And when a certain amount of external force is applied to the load (300) and the load (300) moves forward and the rotation control unit (500) reaches the second position (P2) where the first guide hole (201) and the second guide hole (202) are connected, the rotational shaft (200) is released from rotational lock by the second guide hole (202). In this way, the second position (P2) where the rotational shaft (200) is capable of rotation is a rotational lock release position.

[0062] When the rotation control unit (500) is positioned at the second position (P2), the armrest body (600) can rotate on its own from the support mount (100) due to the self-weight of the armrest body (600) caused by the center of gravity (G) of the armrest body (600) described above. At this time, the armrest body (600) is automatically rotated to the rotation stop position while being guided by the second guide hole (202) formed along the circumference of the rotation shaft (200). That is, the armrest body (600) automatically rotates from one end to the other end of the second guide hole (202) connected to the first guide hole (201). Here, the third position (P3, see FIG. 6) where the rotation of the armrest body (600) is stopped is the rotation stop position.

[0063] Meanwhile, the shaft cover (700) is placed on the outside of the rotating shaft (200) and is configured to protect the rotating shaft (200) from the outside.

[0064] And the push button (800) is coupled to the end of the rod (300). When the push button (800) is pressed, the armrest body (600) is released from the rotation lock through the rod (300) and the elastic member (400), and can rotate by itself to the rotation stop position by its own weight. In other words, when the push button (800) is pressed with a force greater than a certain level, the rotation control unit (500) at the first position (P1) moves to the second position (P2), and the rotation lock of the armrest body (600) can be released. In this way, when the rotation control unit (500) moves to the second position (P2), the armrest body (600) rotates by itself by its own weight. Since the dental unit chair (3000) according to the present invention automatically rotates the armrest body (600) with just one touch of the push button (800), the rotation of the armrest body (600) can be easily accomplished.

[0065] Referring to FIGS. 9 and 10, the armrest body (600) is provided with a partition (610). This partition (610) divides a first receiving groove (611) and a second receiving groove (612).

[0066] Here, based on the partition (610), the first receiving groove (611) is formed on one side of the armrest body (600) that is coupled with the rotating shaft (200), and the second receiving groove (612) is formed on the other side of the armrest body (600).

[0067] In this first receiving groove (611), the end of the rotating shaft (200) is inserted, and the armrest body (600) and the rotating shaft (200) are integrally connected by a fastening member such as a bolt.

[0068] And a push button (800) is inserted into the second receiving groove (612). This second receiving groove (612) guides the movement direction of the push button (800) when the push button (800) is pressed.

[0069] In this way, the push button (800) inserted into the second receiving groove (612) is coupled with the rear end of the rod (300) that penetrates and is inserted through the opening hole (613) formed in the partition (610). The rod (300) coupled with the push button (800) may include a rod body (310), a first protrusion (320), and a second protrusion (330).

[0070] The load body (310) forms the outer shape of the load (300). A fastening hole (301) to which a rotation control unit (500) is coupled is formed in the load body (310).

[0071] And the first protrusion (320) protrudes from one end of the load body (310). This first protrusion (320) is formed to prevent the elastic member (400) from being detached during the process of the elastic member (400) being stretched by the movement of the load (300).

[0072] And the second protrusion (330) protrudes from the other end of the load body (310). This second protrusion (330) is inserted into the first button coupling hole (810, see FIG. 4) formed in the push button (800). In this way, when the second protrusion (330) is inserted into the first button coupling hole (810) and is coupled, the second button coupling hole (820) formed in the push button (800) surrounds the outer surface of the load body (310) and is coupled with the load body (310). Accordingly, the push button (800) can be stably coupled to the load (300) without shaking.

[0073] Since the combination of the load (300) and the push button (800) is not combined with a separate fastening member such as a bolt, for example, when the push button (800) is pulled with a force greater than a certain level, the push button (800) can be separated from the load (300). In this way, since the push button (800) exposed to the outside is made to be detachable from the load (300), if the push button (800) is damaged during use, the user can easily replace the damaged push button (800).

[0074] Meanwhile, the damper unit (900) is configured to provide a braking torque for the rotation of the armrest body unit (600) when the armrest body unit (600) is rotated by its own weight after the rotation lock of the armrest body unit (600) is released. This damper unit (900) is configured to gradually reduce the rotation speed of the armrest body unit (600) when the armrest body unit (600) is rotated to the rotation stop position, thereby preventing the generation of impact noise due to the collision between the other end of the second guide hole (202) and the rotation control unit (500).

[0075] And, when the damper part (900) forcibly rotates the armrest body part (600) rotated by its own weight in the opposite direction with a force greater than a certain level (i.e., when moving the rotation control part (500) at the third position (P3) to the second position (P2)), the armrest body part (600) is made to rotate smoothly. Such a damper part (900) may be, for example, a rotary damper.

[0076] Referring to Fig. 11, the damper part (900) may include a damper body (910) and a rotation control part (920). Here, the damper body (910) is integrally connected to the support mount (100) by a fastening member while being inserted into a damper receiving groove (101) formed recessed in the rear of the support mount (100).

[0077] And the rotation control unit (920) protrudes from the damper body (910) and is configured to rotate independently from the damper body (910). This rotation control unit (920) gradually reduces the rotation speed of the armrest body (600) as the armrest body (600) moves to the rotation stop position, thereby allowing the armrest body (600) to come to a smooth stop.

[0078] A rotation control part (920) such as this is provided with a coupling protrusion (921), and the coupling protrusion (921) is inserted and coupled into a projection support groove (206, see FIG. 6) formed at an end of a rotation shaft (200). In addition, a rotation pressure surface (922) is formed on the coupling protrusion (921), and a pressure support surface (207, see FIG. 6) corresponding to the rotation pressure surface (922) is formed on the projection support groove (206). When the coupling protrusion (921) is inserted into the projection support groove (206), the rotation pressure surface (922) is coupled so as to align with the pressure support surface (207). Accordingly, the braking torque of the coupling protrusion (921) can be effectively transmitted to the rotation shaft (200) in the process of the armrest body part (600) moving to the rotation stop position.

[0079] Let us briefly examine the operating process of the armrest body (600) rotating by pressing the push button (800) through Fig. 12. This armrest body (600) can be automatically rotated by simply pressing the push button (800) with one touch.

[0080] First, the push button (800) is pressed with a force greater than a certain level to rotate the armrest body (600). When the push button (800) is pressed, the load (300) coupled to the push button (800) moves together with the push button (800) in the pressing direction (forward direction) of the push button (800).

[0081] In this way, in the process of the load (300) being moved in the direction of the pushing of the push button (800) by the pushing of the push button (800), the rotation control unit (500) located at the first position (P1) moves to the second position (P2), which is the rotation unlocking position. Here, the rotation control unit (500) moves along the longitudinal direction of the first guide hole (201) in the form of a long hole formed in the rotation shaft (200), and finally moves to the rotation unlocking position, which is the second position (P2), where the first guide hole (201) and the second guide hole (202) are connected. In this way, when the rotation control unit (500) is moved to the second position (P2), the rotation lock of the rotation shaft (200) is released.

[0082] Next, when the rotation control unit (500) is moved to the second position (P2), the armrest body (600) rotates by itself due to the weight of the armrest body (600). In this way, when the rotation control unit (500) is moved to the second position (P2), the rotation shaft (200) coupled to the armrest body (600) rotates together with the armrest body (600). In this process, the rotation shaft (200) rotates along the second guide hole (202) with respect to the rotation control unit (500).

[0083] Finally, the rotating shaft (200) that rotates together with the armrest body (600) rotates to the third position (P3), which is the other end of the second guide hole (202). Here, as the armrest body (600) rotates around the support mount (100) to the rotation stop position, the armrest body (600) gradually slows down its rotation speed by the damper (900) and rotates smoothly. The damper (900) gradually slows down the rotation speed of the armrest body (600) and prevents impact noise from occurring due to the collision between the other end of the second guide hole (202) and the rotation control unit (500).

[0084] Conversely, in order to restore the rotated armrest body (600) to its original position, the armrest body (600) must be rotated in the opposite direction of the rotation with a certain force. For the convenience of explanation, the direction in which the armrest body (600) rotates due to its own weight is referred to as the forward direction, and the rotation in the opposite direction is referred to as the reverse direction.

[0085] In this way, when the rotation control unit (500) is positioned at the second position (P2) through the reverse rotation of the armrest body (600), since no force greater than a certain level is applied to the push button (800), the elastic member (400), which was in a compressed state, pushes the rod (300) through the restoring force. That is, the elastic member (400) moves the rod (300) in the opposite direction of the pressing of the push button (800). In this process, the rotation control unit (500) moves to the first position (P1) along the first guide hole (201) formed in the rotation shaft (200), so that the rotation shaft (200) is prevented from rotating. In addition, the push button (800) also moves to the initial pressing position for the rotation of the armrest body (600) due to the movement of the rod (300).

[0086] In this way, the dental unit chair (3000) according to the present invention has a simple operating structure and is therefore more convenient to use than conventional dental unit chairs.

[0087] However, this is only a preferred embodiment of the present invention, and the scope of the rights of the present invention is not limited by the scope of the description of this embodiment.

[0088] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0089] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims

1. A chair on which the patient can sit or lie down; and An armrest assembly coupled to the above chair portion; The above armrest assembly, A support mount coupled to the above chair portion; A rotating shaft coupled to the support mount and rotated from the support mount; An armrest body part coupled to the above-mentioned rotating shaft and on which the subject's arm is placed; and It includes a rotation control unit that controls the rotation of the armrest body, A dental unit chair in which a rotation guide hole is formed in the rotation shaft, in which a first guide hole formed in the longitudinal direction of the rotation shaft and a second guide hole formed in the circumferential direction of the rotation shaft are connected, and in which rotation or rotation locking of the armrest body is selectively performed depending on the position of the rotation control part inserted through the rotation guide hole.

2. In paragraph 1, The above support mount is, a base coupled to the above chair portion; and It includes a boss portion that protrudes from the base and has a shaft insertion hole formed into which the rotary shaft is inserted; A dental unit chair characterized in that a through hole is formed in the boss portion through which the rotation control portion is inserted.

3. In paragraph 2, The above armrest assembly, A rod inserted into a hollow rod hole formed in the above rotating shaft and having a fastening hole formed therein; An elastic member whose first end is supported on a support surface formed inside the rotating shaft and whose other end is supported on a single-end surface of the rod; A shaft cover disposed on the outside of the above-mentioned rotating shaft to protect the above-mentioned rotating shaft from the outside; and Further comprising a push button coupled to the end of the above load; The end of the above rotation control unit is connected to the fastening hole while being inserted through the through hole and the rotation guide hole, A dental unit chair characterized in that the armrest body part is connected to an end of the rotating shaft.

4. In paragraph 3, A dental unit chair characterized in that the armrest body part is unlocked from rotation by one-touch pressing of the push button and rotates itself to a rotation stop position by its own weight.

5. In paragraph 3, A dental unit chair characterized in that the boss portion has a through hole corresponding to the first guide hole formed therein, and the rotation control portion moves along the longitudinal direction of the through hole during the pressing of the push button.

6. In paragraph 3, A dental unit chair characterized in that the first guide hole is configured to guide axial movement of the load, and the second guide hole is configured to guide rotation of the armrest body.

7. In paragraph 1, A dental unit chair characterized in that the rotation lock of the armrest body is released when the rotation control unit is moved to a rotation unlock position where the first guide hole and the second guide hole are connected, and the armrest body rotates by its own weight while being guided by the second guide hole.

8. In paragraph 3, The above armrest body is provided with a partition that divides the first receiving groove and the second receiving groove. The end of the above-mentioned rotating shaft is integrally connected to the armrest body by a fastening member while being inserted into the first receiving groove formed on one side of the armrest body, A dental unit chair characterized in that the push button is coupled with the load while being inserted into the second receiving groove formed on the other side of the armrest body, and the second receiving groove is configured to guide the movement direction of the push button.

9. In paragraph 3, The above load is, A load body having the above fastening hole formed; A first protrusion protruding from one end of the above load body and preventing the elastic member from being detached during the stretching process of the elastic member; and A dental unit chair characterized in that it includes a second protrusion protruding from the other end of the load body and inserted into a first button engaging groove formed in the push button.

10. In paragraph 1, A dental unit chair characterized in that the center of gravity of the armrest body is formed in the first area on the front side based on an imaginary vertical line passing through the coupling axis of the armrest body part coupled to the support mount based on the armrest assembly in the rotationally locked state.

11. In paragraph 10, A dental unit chair characterized in that the angle formed by the virtual vertical line and the virtual connecting line connecting the center of gravity of the joint axis and the armrest body is 14 to 16°.

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