Screw removal device

Abstract

A screw removal device according to an embodiment of the present invention comprises: a body member including a first groove insertion portion and extending in the front-rear direction; a wedge member including a second groove insertion portion and arranged so as to be movable in the front-rear direction relative to the body member; and a pressing member disposed in the body member so as to move the wedge member in the front-rear direction. A first pressing guide surface is formed on the first groove insertion portion, and a second pressing guide surface is formed on the second groove insertion portion so as to face the first pressing guide surface. The wedge member may be placed at a disengagement position, at which at least one of the first groove insertion portion or the second groove insertion portion is not dislodged in a direction perpendicular to at least one of the first pressing guide surface or the second pressing guide surface, or an engagement position, at which the first pressing guide surface and the second pressing guide surface are arranged so as to face each other, and at least one of the first groove insertion portion or the second groove insertion portion is dislodged in a direction perpendicular to at least one of the first pressing guide surface or the second pressing guide surface.

Description

Screw remover

[0001] The present invention relates to a screw removal device.

[0002] Recently, in the field of orthopedics, locking compression plates and polygonal locking screws, which secure the plates to the bone, have been widely used in fracture and bone correction surgeries. Polygonal locking screws with hexagonal or star-shaped insertion grooves in the screw heads are commonly used.

[0003] After sufficient bone union has occurred through fracture and bone correction surgery or procedures, polygonal locking screws and plates may need to be removed. Even if bone union does not occur, removal of the metal may be necessary if conditions such as infection or plate failure occur.

[0004] The biggest problem with using locking compression plates and polygonal locking screws is damage to the screw heads of the polygonal locking screws during metal removal surgery.

[0005] When a metal polygonal locking screw is fixed to the bone and bone union occurs over a period of time, the bonding strength between the bone and the screw increases. In this case, when the polygonal locking screw is removed, the high bonding strength between the screw and the bone can cause the polygonal insertion groove formed in the screw head to become crushed.

[0006] If the polygonal insertion groove formed in the screw head of a polygonal locking screw becomes damaged, the screw can be difficult to remove using a standard screwdriver. Therefore, the screw can be removed using a conventional polygonal locking screwdriver, or if this method fails, the screw head must be ground down with special equipment (burrs) to remove the screw.

[0007] Conventional polygonal locking screw removal drivers can remove screws by engaging the driver in a polygonal insertion groove formed in the screw head of the polygonal locking screw. At this time, the removal driver must be rotated with a constant force and direction while being aligned exactly perpendicular to the polygonal insertion groove of the screw head in order to loosen the polygonal locking screw.

[0008] When removing a conventional polygonal locking screw, a gap inevitably forms between the removal driver and the polygonal insertion groove of the screw head. This gap reduces the sealing force between the polygonal insertion groove of the screw head and the removal driver, making it difficult to remove the screw and causing the removal driver to become damaged after several uses.

[0009] Additionally, the polygonal insertion groove formed in the screw head can be damaged due to the reduced adhesion between the screw removal driver and the screw due to the gap between the screw and the insertion groove. In such cases, when the screw head is removed using special equipment (burrs) and the locking pressure metal plate is removed, small metal fragments remain in the patient's body, which can cause inflammation or infection as foreign substances.

[0010] Embodiments of the present invention have been invented against the background described above, and are intended to provide a screw removal device capable of removing a screw from a screw-joined screw-joined member without damaging an insertion groove formed in a screw head.

[0011] In addition, it is intended to provide a screw removal device that can easily remove a screw from a screw-joint member even if the insertion groove has already been damaged.

[0012] In addition, it is intended to provide a screw removal device that can effectively remove screws by providing a wedge member that matches the size and shape of the screw hole.

[0013] A screw removal device according to one aspect of the present invention comprises: a body member including a first groove insertion portion and extending in a front-back direction; a wedge member including a second groove insertion portion and positioned so as to be movable in the front-back direction with respect to the body member; And it includes a pressing member arranged on the body member to move the wedge member in the forward and backward direction, and a first pressing induction surface is formed on the first groove insertion portion, and a second pressing induction surface is formed on the second groove insertion portion to face the first pressing induction surface, and the wedge member can be placed in an engagement release position in which at least one of the first groove insertion portion and the second groove insertion portion does not push against each other in a direction perpendicular to at least one of the first pressing induction surface and the second pressing induction surface, or in an engagement position in which the first pressing induction surface and the second pressing induction surface are arranged to face each other and at least one of the first groove insertion portion and the second groove insertion portion push against each other in a direction perpendicular to at least one of the first pressing induction surface and the second pressing induction surface.

[0014] In addition, when the first groove insertion portion and the second groove insertion portion are viewed in the front-back direction while the wedge member is placed at the engaging position, the first groove insertion portion and the second groove insertion portion can form a polygonal shape.

[0015] Additionally, the polygon may be hexagonal or star-shaped.

[0016] In addition, the first pressurized induction surface and the second pressurized induction surface can be tilted so that a first angle, which is an acute angle between a normal line to the first pressurized induction surface and an imaginary line in the forward-backward direction, is greater than a second angle, which is an acute angle between a normal line to the second pressurized induction surface and an imaginary line in the forward-backward direction.

[0017] Additionally, the size of the second home insertion portion may be smaller than the size of the first home insertion portion.

[0018] In addition, the first home insertion portion may further have a first guide surface formed thereon that is connected to the first pressure induction surface to form a predetermined angle with the first pressure induction surface, and the second home insertion portion may further have a second guide surface formed thereon that is connected to the second pressure induction surface to form a predetermined angle with the second pressure induction surface and faces the first guide surface.

[0019] Additionally, a wedge member moving hole may be formed in the body member, which is connected to the first pressurized induction surface and in which the wedge member is movably positioned.

[0020] In addition, an exposed space may be formed in the body member so that the wedge member and the pressure member are movably arranged and connected to the wedge member moving hole and exposed to the outside.

[0021] In addition, at least a portion of the pressure member may be movably arranged in the body member, and a pressure member movement hole connected to the exposed space may be formed.

[0022] In addition, the body member may further include a middle part of the member connected to the first home insertion part and in which the wedge member moving hole, the exposed space, and a part of the pressure member moving hole are formed; and a grip part connected to the middle part of the member and in which another part of the pressure member moving hole is formed.

[0023] In addition, the wedge member may further include a wedge member moving part that is connected to the second home insertion part and is movably arranged in the wedge member moving hole and the exposed space.

[0024] In addition, the body member may further be formed with a movement guide groove that is connected to the wedge member movement hole and the exposed space and guides the movement of the wedge member movement portion, and the wedge member movement portion may be formed with a movement guide protrusion that is movably inserted into the movement guide groove.

[0025] Additionally, the moving guide protrusion may protrude further than the circumferential surface of the moving portion of the wedge member in the radial direction.

[0026] In addition, the pressurizing member may include a pressurizing moving part that is arranged to be movable in the forward and backward direction on the body member to pressurize the wedge member, and a handle part that extends from the pressurizing moving part to form a predetermined angle with the forward and backward direction.

[0027] According to embodiments of the present invention, there is an effect that the screw can be removed from the screw-joined member without damaging the insertion groove by increasing the adhesion with the insertion groove formed in the screw head, and the screw can be easily removed from the screw-joint member even if the insertion groove is already damaged.

[0028] In addition, there is an effect that the screw can be effectively removed by providing a wedge member that matches the size and shape of the screw hole.

[0029] FIG. 1 is an exploded perspective view of a screw removal device according to a first embodiment of the present invention and an enlarged view of a first groove insertion portion and a wedge member.

[0030] FIG. 2 is a perspective view showing a wedge member of a screw removal device according to a first embodiment of the present invention when placed in an engaged disengaged position, and an enlarged view and a plan view of a first groove insertion portion and a second groove insertion portion.

[0031] FIG. 3 is a perspective view showing a wedge member of a screw removal device according to a first embodiment of the present invention when placed in an engaging position, and an enlarged view and a plan view of a first groove insertion portion and a second groove insertion portion.

[0032] FIG. 4 is a plan view showing a state of use of a screw removal device according to a first embodiment of the present invention, showing that the screw removal device has been moved to a location where a screw is coupled to a screw-joining member.

[0033] FIG. 5 is a plan view and an enlarged view showing a state of use of a screw removal device according to a first embodiment of the present invention, in which a wedge member of the screw removal device is placed in an engaged disengaged position and a first groove insertion portion of a body member is inserted into an insertion groove of a screw.

[0034] FIG. 6 is a plan view and an enlarged view showing a state of use of a screw removal device according to a first embodiment of the present invention, in which a first groove insertion portion of a body member is inserted into an insertion groove of a screw, and a wedge member is moved to an engaging position by a pressing member so that at least a portion of the first groove insertion portion and at least a portion of the second groove insertion portion are in close contact with at least a portion of the insertion groove of the screw.

[0035] FIG. 7 is a plan view showing a state of use of a screw removal device according to a first embodiment of the present invention, in which at least a portion of a first groove insertion portion and at least a portion of a second groove insertion portion are in close contact with at least a portion of an insertion groove of a screw, and the screw removal device is rotated in the direction in which the screw is loosened to remove the screw from the screw-joining member.

[0036] FIG. 8 is an exploded perspective view of a screw removal device according to a second embodiment of the present invention and an enlarged view of the first groove insertion portion and the second groove insertion portion.

[0037] FIG. 9 is a perspective view showing a wedge member of a screw removal device according to a second embodiment of the present invention when placed in an engaged disengaged position, and an enlarged view and side view of a first groove insertion portion and a second groove insertion portion.

[0038] FIG. 10 is a perspective view showing a wedge member of a screw removal device according to a second embodiment of the present invention when placed in an engaging position, and an enlarged view and side view of a first groove insertion portion and a second groove insertion portion.

[0039] FIG. 11 is a side view and an enlarged view showing that the first groove insertion portion of the body member is inserted into the insertion groove of the screw while the wedge member of the screw removal device according to the second embodiment of the present invention is placed in the disengaged position.

[0040] FIG. 12 is a side view and an enlarged view showing a state in which a first groove insertion portion of a body member of a screw removal device according to a second embodiment of the present invention is inserted into an insertion groove of a screw, and a wedge member is moved to an engaging position by a pressing member so that at least a portion of the first groove insertion portion and at least a portion of the second groove insertion portion are in close contact with at least a portion of the insertion groove of the screw.

[0041] Figure 13 is an exploded perspective view of a screw removal device according to a third embodiment of the present invention.

[0042] FIG. 14 is a perspective view showing a wedge member of a screw removal device according to a third embodiment of the present invention when placed in an engaged disengaged position, and an enlarged view and side view of the first groove insertion portion and the second groove insertion portion.

[0043] FIG. 15 is a perspective view showing a wedge member of a screw removal device according to a third embodiment of the present invention when placed in an engaging position, and an enlarged view and side view of the first groove insertion portion and the second groove insertion portion.

[0044] FIG. 16 is a side view and an enlarged view showing that the first groove insertion portion of the body member is inserted into the insertion groove of the screw while the wedge member of the screw removal device according to the third embodiment of the present invention is placed in the disengaged position.

[0045] FIG. 17 is a side view and an enlarged view showing that the wedge member of the screw removal device according to the third embodiment of the present invention is placed in an engaging position so that at least a portion of the first groove insertion portion and at least a portion of the second groove insertion portion are in close contact with at least a portion of the insertion groove of the screw.

[0046] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0047] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0048] Additionally, when it is said that a component is 'connected', 'supported' or 'in contact with' another component, it should be understood that it may be directly connected, supported, connected, supplied, transmitted or in contact with that other component, but there may also be other components present in between.

[0049] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0050] Additionally, please note that the terms "upper", "lower", "front-back", "front", "rear", etc. used in this specification are based on the drawings and may be expressed differently if the orientation of the object changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the size of each component does not fully reflect the actual size.

[0051] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0052] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0053] Hereinafter, a specific configuration of a screw removal device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. The screw removal device (1) is a device for removing a screw (2) from a screw-joining member (3) to which the screw (2) is coupled. The screw (2) to be removed by the screw removal device (1) may include a screw body (2-1) having screw threads (2-11) formed on at least a portion of the outer periphery, and a screw head (2-2) connected to the upper portion of the screw body (2-1) and having an insertion groove (2-21) formed therein. The screw removal device (1) may be configured such that at least a portion thereof is engaged with the insertion groove (2-21) of the screw (2) or is released from being engaged. In other words, the screw removal device (1) may be configured such that at least a portion thereof is forcibly fitted into the insertion groove (2-21) of the screw (2) or is released from being forcibly fitted into the insertion groove (2-21). When at least a part of the screw removal device (1) is engaged with the insertion groove (2-21) of the screw (2), the screw (2) is rotated together with the screw removal device (1), so that the screw (2) is released from the screw-joining member (3) and the screw (2) can be removed from the screw-joining member (3). The screw removal device (1) may include a body member (100), a wedge member (200), and a pressure member (300).

[0054] Referring to FIGS. 1 to 3, the body member (100) can support the movement of the wedge member (200) and the pressure member (300). In other words, the wedge member (200) and the pressure member (300) can be movably arranged with respect to the body member (100). In addition, a portion of the body member (100) can be inserted into the insertion groove (2-21) of the screw (2). This portion of the body member (100) can be engaged with a portion of the wedge member (200) by the movement of the wedge member (200) while being inserted into the insertion groove (2-21) of the screw (2). The body member (100) can extend in the front-rear direction. The forward and backward direction in which the body member (100) extends may be the direction in which the wedge member (200) and the pressure member (300) move. In addition, the body member (100) may support the wedge member (200) and the pressure member (300) so that the wedge member (200) and the pressure member (300) move in the forward and backward direction. In other words, the wedge member (200) and the pressure member (300) may be arranged on the body member (100) so as to be able to move in the forward and backward direction.

[0055] A pressure member moving hole (100-1) may be formed in the body member (100). At least a portion of the pressure member (300) may be movably arranged in the pressure member moving hole (100-1). The pressure member moving hole (100-1) extends in the front-rear direction, and a pressure moving part (310) to be described later may be movably arranged in the front-rear direction. The pressure member moving hole (100-1) may be connected to an exposed space (120-2) to be described later. A female screw thread (not shown) may be formed in the pressure member moving hole (100-1). In addition, the pressure moving part (310) may be moved while rotating in the pressure member moving hole (100-1). The body member (100) may include a first home insertion portion (110), a middle portion (120), and a grip portion (130).

[0056] The first groove insertion portion (110) can be inserted into the insertion groove (2-21) of the screw (2). The first groove insertion portion (110) may have a polygonal shape when viewed in the front-back direction. For example, the first groove insertion portion (110) may have a trapezoidal shape when viewed in the front-back direction. In other words, the first groove insertion portion (110) may have a polygonal column shape including a trapezoidal column. In addition, when the first groove insertion portion (110) and the second groove insertion portion (210) are viewed in the front-back direction while the wedge member (200) is placed in the engaging position, the first groove insertion portion (110) and the second groove insertion portion (210) may form a polygonal shape. For example, when the first groove insertion portion (110) and the second groove insertion portion (210) are viewed in the front-back direction while the wedge member (200) is placed in the engaging position, the first groove insertion portion (110) and the second groove insertion portion (210) can form a hexagonal shape or a star shape, etc. In other words, when the wedge member (200) is placed in the engaging position, the first groove insertion portion (110) and the second groove insertion portion (210) can form a polygonal column, such as a hexagonal column or a star-shaped column.

[0057] A first pressure-inducing surface (111) may be formed in the first groove insertion portion (110). The first pressure-inducing surface (111) may be an inclined surface. The first pressure-inducing surface (111) may be formed to be inclined so that a cross-section of the first groove insertion portion (110) perpendicular to the front-back direction becomes larger as it goes forward. In addition, the first pressure-inducing surface (111) may form a first angle (α1) which is an acute angle between a normal line (NL) to the first pressure-inducing surface (111) and an imaginary line (IL) in the front-back direction. In addition, the first pressure-inducing surface (111) may be formed to be inclined so that the first angle (α1) is greater than a second angle (α2) which will be described later, which is an acute angle between a normal line (NL) to the second pressure-inducing surface (211) and an imaginary line (IL) in the front-back direction.

[0058] The middle part (120) of the member can support the movement of the wedge member (200). In addition, the middle part (120) of the member can be connected to the grip part (130). The middle part (120) of the member can be connected to the first groove insertion part (110). The middle part (120) of the member can extend in the front-back direction to support the wedge member (200) and the pressing member (300) so that the wedge member (200) and the pressing member (300) can move in the front-back direction. A wedge member moving hole (120-1), an exposed space (120-2), a moving guide groove (120-3), and a part of the pressing member moving hole (100-1) can be formed in the middle part (120).

[0059] A wedge member moving hole (120-1) may be formed in the middle portion (120) of the member so as to be connected to the first pressure induction surface (111). A wedge member (200) may be positioned in the wedge member moving hole (120-1) so as to be movable in the forward and backward direction. The wedge member moving hole (120-1) may extend in the forward and backward direction.

[0060] The exposed space (120-2) is connected to the wedge member movement hole (120-1) and can be formed in the middle part (120) of the member so as to be exposed to the outside. The wedge member (200) and the pressure member (300) can be arranged in the exposed space (120-2) so as to be movable in the forward and backward direction. The exposed space (120-2) can extend in the forward and backward direction.

[0061] The movement guide groove (120-3) can guide the movement of the wedge member (200). The movement guide groove (120-3) can guide the movement of the wedge member moving part (220) included in the wedge member (200), which will be described later. The movement guide groove (120-3) can be connected to the wedge member moving hole (120-1) and the exposed space (120-2). The movement guide groove (120-3) can extend in the forward-backward direction. In addition, a movement guide protrusion (220-1), which will be described later and is formed on the wedge member moving part (220), can be inserted into the movement guide groove (120-3) so as to be movable in the forward-backward direction.

[0062] The gripping part (130) supports the movement of the pressing member (300) and can be gripped by a user (not shown). The gripping part (130) can be connected to the middle part (120) of the member. The gripping part (130) can extend in the forward and backward direction. Another part of the pressing member moving hole (100-1) can be formed in the gripping part (130). The pressing moving part (310) of the pressing member (300) can be arranged in the pressing member moving hole (100-1) of the gripping part (130) so as to be movable in the forward and backward direction. A gripping surface (130-1) that can be gripped by a user can be formed on the outer surface of the gripping part (130). The gripping surface (130-1) can be flat and can be provided in multiple pieces. For example, the two grip surfaces (130-1) may be provided, and one of the two grip surfaces (130-1) may be formed on the upper side of the grip portion (130), and the other may be formed on the lower side of the grip portion (130).

[0063] The wedge member (200) can be arranged to be movable in the forward and backward direction with respect to the body member (100). The wedge member (200) can be placed in a disengaged position or an engaged position depending on the moved position. The disengaged position is a position where at least one of the first groove insertion portion (110) and the second groove insertion portion (210) to be described later cannot be pushed relative to each other in a direction perpendicular to at least one of the first pressure-inducing surface (111) and the second pressure-inducing surface (211) to be described later. In addition, the engagement position is a position where the first pressure-inducing surface (111) and the second pressure-inducing surface (211) are arranged to face each other, and at least one of the first groove insertion portion (110) and the second groove insertion portion (210) can be pushed against each other in a direction perpendicular to at least one of the first pressure-inducing surface (111) and the second pressure-inducing surface (211). When a part of the body member (100) is inserted into the insertion groove (2-21) of the screw (2), if a part of the wedge member (200) is placed in the engagement disengagement position, a part of the wedge member (200) may not engage with a part of the body member (100). In addition, when a part of the body member (100) is inserted into the insertion groove (2-21) of the screw (2), and the wedge member (200) is placed in the engaging position, a part of the wedge member (200) can be engaged with a part of the body member (100). In addition, a part of the wedge member (200) and a part of the body member (100) can be in close contact with the insertion groove (2-21) of the screw (2). In other words, a part of the wedge member (200) and a part of the body member (100) can be forcefully fitted into the insertion groove (2-21) of the screw (2). This wedge member (200) can extend in the front-rear direction. The wedge member (200) can include a second groove insertion portion (210) and a wedge member moving portion (220).

[0064] The second groove insertion portion (210) may not be engaged with the first groove insertion portion (110) so that the first groove insertion portion (110) can be inserted into the insertion groove (2-21) of the screw (2) when the wedge member (200) is placed in the disengaged position. In addition, the second groove insertion portion (210) may be engaged with the first groove insertion portion (110) when the wedge member (200) is placed in the engaging position while the first groove insertion portion (110) is inserted into the insertion groove (2-21) of the screw (2). In addition, at least a portion of the second groove insertion portion (210) and at least a portion of the first groove insertion portion (110) may be in close contact with the insertion groove (2-21) of the screw (2). In other words, when the wedge member (200) is placed in the engaging position, the second home insertion portion (210) can be forcibly fitted into the insertion groove (2-21) of the screw (2) together with the first home insertion portion (110).

[0065] The second groove insertion portion (210) may have a polygonal shape when viewed in the front-back direction. For example, the second groove insertion portion (210) may have a trapezoidal shape when viewed in the front-back direction. In other words, the second groove insertion portion (210) may have a polygonal column shape including a trapezoidal column. In addition, when the second groove insertion portion (210) and the first groove insertion portion (110) are viewed in the front-back direction while the wedge member (200) is placed in the engaging position, the second groove insertion portion (210) and the first groove insertion portion (110) may form a polygonal shape. For example, when the second groove insertion portion (210) and the first groove insertion portion (110) are viewed in the front-back direction while the wedge member (200) is placed in the engaging position, the second groove insertion portion (210) and the first groove insertion portion (110) can form a hexagonal shape or a star shape, etc. In other words, when the wedge member (200) is placed in the engaging position, the second groove insertion portion (210) and the first groove insertion portion (110) can form a polygonal column, such as a hexagonal column or a star-shaped column.

[0066] A second pressure-inducing surface (211) may be formed in the second groove insertion portion (210). The second pressure-inducing surface (211) may be formed to face the first pressure-inducing surface (111) of the first groove insertion portion (110). If the area where the second pressure-inducing surface (211) and the first pressure-inducing surface (111) face each other is referred to as an opposing area, the opposing area at the engaging position of the wedge member (200) may be larger than the opposing area at the disengaged position of the wedge member (200). The second pressure-inducing surface (211) may be an inclined surface. The second pressure-inducing surface (211) may be formed to be inclined so that the cross-section of the second groove insertion portion (210) perpendicular to the front-back direction becomes smaller as it goes forward. In addition, the second pressurization induction surface (211) can form a second angle (α2) which is an acute angle between a normal line (NL) to the second pressurization induction surface (211) and an imaginary line (IL) in the forward-backward direction. In addition, the second pressurization induction surface (211) can be formed to be inclined so that the second angle (α2) is smaller than the first angle (α1) which is an acute angle between a normal line to the first pressurization induction surface (111) and an imaginary line (IL) in the forward-backward direction.

[0067] The wedge member moving part (220) can move forward and backward with respect to the body member (100) together with the second groove insertion part (210). The wedge member moving part (220) can be connected to the second groove insertion part (210). The wedge member moving part (220) can extend in the forward and backward direction. The wedge member moving part (220) can be movably arranged in the wedge member moving hole (120-1) and the exposed space (120-2) of the body member (100). A moving guide protrusion (220-1) and a pressing moving part contact groove (220-2) can be formed on the wedge member moving part (220).

[0068] The moving guide protrusion (220-1) can be inserted into the moving guide groove (120-3) of the middle portion (120) of the body member (100). The moving guide protrusion (220-1) can protrude further than the circumference of the wedge member moving portion (220) in the radial direction. The moving guide protrusion (220-1) can be used not only to guide the movement of the wedge member (200), but also to move the wedge member (200) moved to the engaging position to the disengaging position.

[0069] One end of the pressurizing member (300) can be in contact with the pressurizing moving part contact groove (220-2). For example, the front end of the pressurizing moving part (310) can be in contact with the pressurizing moving part contact groove (220-2).

[0070] The pressure member (300) may be arranged on the body member (100) to move the wedge member (200) in the forward and backward direction. A portion of the pressure member (300) may be moved in the forward and backward direction while rotating. The pressure member (300) may include a pressure moving portion (310) and a handle portion (320).

[0071] The pressurizing moving part (310) can be arranged to be movable in the forward and backward direction on the body member (100) to pressurize the wedge member (200). The pressurizing moving part (310) can be inserted so as to penetrate the pressurizing moving part hole (100-1) of the body member (100). The pressurizing moving part (310) can have a male screw thread formed to engage with a female screw thread formed in the pressurizing moving part hole (100-1). The pressurizing moving part (310) can be moved in the forward and backward direction while being rotated in the pressurizing moving part hole (100-1) by a rotational force applied by a user through the handle part (320). In other words, the pressurizing moving part (310) can be moved forward when rotated in one direction by the rotational force transmitted through the handle part (320), and can be moved backward when rotated in the other direction opposite to the one direction. In addition, the front end of the pressurized moving part (310) can be in contact with the pressurized moving part contact groove (220-2) of the wedge moving part (220) of the wedge member (200). In addition, the wedge member (200) can be pressed and moved by the movement of the pressurized moving part (310). For example, when the pressurized moving part (310) moves forward, the wedge member (200) can be moved forward, and the wedge member (200) can be moved from the disengaged position to the engaged position.

[0072] The handle portion (320) may be configured to apply rotational force to the pressurized moving portion (310). In other words, when a user holds the handle portion (320) and rotates the handle portion (320), the pressurized moving portion (310) may rotate together with the handle portion (320). The handle portion (320) may extend from the pressurized moving portion (310) to form a predetermined angle with respect to the forward-backward direction. For example, the handle portion (320) may extend from the rear end of the pressurized moving portion (310) to form a right angle with respect to the forward-backward direction.

[0073] Hereinafter, with reference to FIGS. 4 to 7, the operation and effect of the screw removal device (1) according to the first embodiment of the present invention having the configuration described above will be described.

[0074] Referring to Fig. 4, the user can move the screw removal device (1) to a position where the screw (2) to be removed is engaged with the screw engaging member (3). In addition, the wedge member (200) of the screw removal device (1) is placed in the disengaged position, and the front end of the pressing moving part (310) of the pressing member (300) can be brought into contact with the pressing moving part contact groove (220-2) of the wedge member moving part (220) of the wedge member (200).

[0075] Referring to Fig. 5, after moving the screw removal device (1) to a position where the screw (2) to be removed is coupled to the screw joint member (3), the user can grip the grip portion (130) of the body member (100) of the screw removal device (1) and the handle portion (320) of the pressure member (300). In this state, the user can insert the first groove insertion portion (110) of the body member (100) into the insertion groove (2-21) of the screw (2).

[0076] Referring to Fig. 6, when the first groove insertion portion (110) of the body member (100) is inserted into the insertion groove (2-21) of the screw (2), the user can rotate the pressing member (300) by rotating the handle portion (320) so that the pressing member (300) moves forward. As the pressing member (300) moves forward, the wedge member (200) moves forward, so that the wedge member (200) can be moved from the disengaged position to the engaged position. When the wedge member (200) is placed in the engaged position, the first pressurizing guide surface (111) of the first groove insertion portion (110) and the second pressurizing guide surface (211) of the second groove insertion portion (210) can be arranged to face each other. In addition, at least one of the first home insertion portion (110) and the second home insertion portion (210) can be pushed against each other in a direction perpendicular to at least one of the first pressure-inducing surface (111) and the second pressure-inducing surface (211). In addition, at least a portion of the first home insertion portion (110) and at least a portion of the second home insertion portion (210) can be brought into close contact with the insertion groove (2-21) of the screw (2). In other words, the first home insertion portion (110) and the second home insertion portion (210) can be forcefully fitted into the insertion groove (2-21) of the screw (2).

[0077] Referring to Fig. 7, when at least a portion of the first home insertion portion (110) and at least a portion of the second home insertion portion (210) are in close contact with the insertion groove (2-21) of the screw (2), the user can rotate the screw removal device (1) in the direction in which the screw (2) is loosened. By rotating the screw removal device (1) in the direction in which the screw (2) is loosened, the screw (2) is loosened from the screw-joining member (3), and the screw (2) can be removed from the screw-joining member (3).

[0078] After removing the screw (2) from the screw joint member (3), the user can rotate the pressing member (300) by rotating the handle member (320) so that the pressing member (300) moves rearward. As the pressing member (300) moves rearward, the front end of the pressing moving part (310) of the pressing member (300) does not come into contact with the pressing moving part contact groove (220-2) of the wedge moving part (220) of the wedge member (200) and can move away from the wedge moving part (220).

[0079] In this state, the user can apply a rearward force to the moving guide projection (220-1) to move the wedge member (200) to the engagement disengagement position. In addition, the screw (2) and the screw removal device (1) can be separated. In other words, after separating the second groove insertion portion (210) of the wedge member (200) from the insertion groove (2-21) of the screw (2), the first groove insertion portion (110) of the body member (100) is separated from the insertion groove (2-21) of the screw (2), thereby separating the screw (2) and the screw removal device (1).

[0080] In this way, the screw removal device (1) according to the first embodiment of the present invention can increase the adhesion between the screw (2) and the insertion groove (2-21) when removing the screw (2). In other words, the first groove insertion portion (110) and the second groove insertion portion (210) of the screw removal device (1) can be forcibly fitted into the insertion groove (2-21) of the screw (2). Therefore, the screw (2) can be removed from the screw-joining member (3) without damaging the insertion groove (2-21), and even if the insertion groove (2-21) is already damaged, the screw (2) can be easily removed from the screw-joining member (3).

[0081] Meanwhile, in addition to this configuration, according to the second embodiment of the present invention, the size of the second home insertion portion (210) may be smaller than the size of the first home insertion portion (110), a first guide surface (112) may be further formed on the first home insertion portion (110), and a second guide surface (212) may be further formed on the second home insertion portion (210).

[0082] Hereinafter, a second embodiment will be described with reference to FIGS. 8 to 12. In describing the second embodiment of the present invention, compared to the first embodiment described above, there is a difference in that the size of the second groove insertion portion (210) may be smaller than the size of the first groove insertion portion (110), a first guide surface (112) is further formed in the first groove insertion portion (110), and a second guide surface (212) is further formed in the second groove insertion portion (210). These differences will be mainly described, and the same descriptions and drawing reference numerals refer to the above-described embodiments.

[0083] Referring to FIGS. 8 to 10, the size of the second home insertion portion (210) may be smaller than the size of the first home insertion portion (110). For example, the second home insertion portion (210) may be 1 / 4 the size of a hexagonal column or a star-shaped column, and the first home insertion portion (110) may be 3 / 4 the size of a hexagonal column or a star-shaped column. In other words, the size of the second home insertion portion (210) may be 1 / 3 the size of the first home insertion portion (110).

[0084] The first guide surface (112) can be connected to the first pressurization induction surface (111) so as to form a predetermined angle with the first pressurization induction surface (111). For example, the first guide surface (112) can be connected to the first pressurization induction surface (111) so as to form a right angle with the first pressurization induction surface (111) when viewed in the front-rear direction. The first guide surface (112) can guide the movement of the wedge member (200) while facing the second guide surface (212). The wedge member moving hole (120-1) can be connected to the first pressurization induction surface (111) and the first guide surface (112).

[0085] The second guide surface (212) is connected to the second pressurized induction surface (211) so as to form a predetermined angle with the second pressurized induction surface (211) and may face the first guide surface (112). For example, the second guide surface (212) may be connected to the second pressurized induction surface (211) so as to form a right angle with the second pressurized induction surface (211). The second guide surface (212) may guide the movement of the wedge member (200) together with the first guide surface (112).

[0086] Referring to Fig. 11, when the wedge member (200) of the screw removal device (1) is in the disengaged position, the user can insert the first groove insertion portion (110) of the body member (100) into the insertion groove (2-21) of the screw (2).

[0087] Referring to Fig. 12, when the first groove insertion portion (110) is inserted into the insertion groove (2-21) of the screw (2), the user can rotate the pressing member (300) using the handle portion (320) so that the pressing member (300) moves forward. As the pressing member (300) moves forward, the wedge member (200) moves forward, so that the wedge member (200) can be moved from the disengaged position to the engaged position. When the wedge member (200) is placed in the engaged position, the first pressurization-inducing surface (111) of the first groove insertion portion (110) and the second pressurization-inducing surface (211) of the second groove insertion portion (210) can be arranged to face each other. In addition, at least one of the first home insertion portion (110) and the second home insertion portion (210) can be pushed against each other in a direction perpendicular to at least one of the first pressure-inducing surface (111) and the second pressure-inducing surface (211). In addition, at least a portion of the first home insertion portion (110) and at least a portion of the second home insertion portion (210) can be brought into close contact with the insertion groove (2-21) of the screw (2). In other words, the first home insertion portion (110) and the second home insertion portion (210) can be forcefully fitted into the insertion groove (2-21) of the screw (2).

[0088] When at least a portion of the first home insertion portion (110) and at least a portion of the second home insertion portion (210) are in close contact with the insertion groove (2-21) of the screw (2), the user can rotate the screw removal device (1) in the direction in which the screw (2) is loosened. As the screw removal device (1) is rotated in the direction in which the screw (2) is loosened, the screw (2) is loosened from the screw-joining member (3), and the screw (2) can be removed from the screw-joining member (3).

[0089] Hereinafter, a third embodiment will be described with reference to FIGS. 13 to 17. In describing the third embodiment of the present invention, compared to the first embodiment described above, there is a difference in that the pressing member (300) can be used with the member removed, and the first groove insertion body (110a) in which the first groove insertion portion (110) is formed is selectively connected to the middle portion (120) of the member. There is a difference in that the second groove insertion portion (210) is provided in various forms and is used based on the shape and size of the insertion groove (2-21) of the screw (2). In addition, the pressing connection portion (121) is arranged in the pressing connection portion moving hole (100-2) formed in the first groove insertion portion body (110a) and can move forward and backward. Hereinafter, the description will be focused on these differences, and the same description and drawing reference numerals refer to the above-described embodiments.

[0090] Referring to FIGS. 13 to 17, a screw removal device (1) according to a third embodiment of the present invention may have a first groove insertion portion (110) formed in a first groove insertion portion body (110a), and this first groove insertion portion body (110a) may be selectively connected to a member middle portion (120). A pressure connection portion (121) to which the first groove insertion portion body (110a) is selectively connected may be formed at an end of the member middle portion (120). In other words, the member middle portion (120) and the first groove insertion portion body (110a) may be separated or connected. A pressure connection portion moving hole (100-2) may be formed in this first groove insertion portion body (110a) so that the pressure connection portion (121) may be inserted. This pressurized connection part (121) is arranged in the pressurized connection moving hole (100-2) and can pressurize the wedge member (200) by moving in the front-back direction with respect to the first groove insertion body (110a). In other words, the screw removal device (1) may not include the pressurized member (300). In addition, the pressurized connection part (121) may have a male screw thread formed that engages with the female screw thread formed in the pressurized connection moving hole (100-2).

[0091] In addition, the second groove insertion portion (210) of the wedge member (200) may be provided in multiple pieces based on the shape and size of the insertion groove (2-21) of the screw (2). For example, when the intermediate portion (120) and the first groove insertion portion body (110a) are separated, any one of the multiple wedge members (200) connected to the first groove insertion portion (110) that matches the shape and size of the insertion groove (2-21) of the screw (2) may be selected.

[0092] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope in accordance with the technical concepts disclosed in this specification. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. A body member including a first home insertion portion and extending in the front-rear direction; A wedge member including a second home insertion portion and positioned so as to be movable in the forward and backward direction with respect to the body member; and It includes a pressure member arranged on the body member to move the wedge member in the forward and backward direction, A first pressure-inducing surface is formed in the first home insertion portion, and a second pressure-inducing surface is formed in the second home insertion portion so as to face the first pressure-inducing surface. The above wedge member is, At least one of the first groove insertion portion and the second groove insertion portion is in an engagement release position where they do not push against each other in a direction perpendicular to at least one of the first pressure-inducing surface and the second pressure-inducing surface, or at least one of the first groove insertion portion and the second groove insertion portion is in an engagement position where the first pressure-inducing surface and the second pressure-inducing surface are arranged to face each other and push against each other in a direction perpendicular to at least one of the first pressure-inducing surface and the second pressure-inducing surface. Screw remover.

2. In paragraph 1, When the first groove insertion portion and the second groove insertion portion are viewed in the front-back direction while the wedge member is placed in the interlocking position, the first groove insertion portion and the second groove insertion portion form a polygonal shape. Screw remover.

3. In paragraph 2, The above polygon is hexagonal or star-shaped, Screw remover.

4. In paragraph 1, The first pressure-inducing surface and the second pressure-inducing surface are tilted so that the first angle, which is an acute angle between the normal to the first pressure-inducing surface and the imaginary line in the forward-backward direction, is greater than the second angle, which is an acute angle between the normal to the second pressure-inducing surface and the imaginary line in the forward-backward direction. Screw remover.

5. In paragraph 1, The above body member A wedge member moving hole is formed that is connected to the first pressurized induction surface and in which the wedge member is movably positioned. Screw remover.

6. In paragraph 5, The above body member An exposed space is formed that is connected to the wedge member moving hole so that the wedge member and the pressure member can be moved and exposed to the outside. Screw remover.

7. In paragraph 6, The above body member At least a part of the above pressurizing member is arranged to be movable, and a pressurizing member moving hole connected to the exposed space is formed. Screw remover.

8. In paragraph 7, The above body member A middle part of the member connected to the first home insertion part and in which the wedge member moving hole, the exposed space, and a part of the pressure member moving hole are formed; and Further comprising a gripping portion connected to the above-mentioned intermediate portion and in which another part of the pressure member moving hole is formed. Screw remover.

9. In paragraph 7, The above wedge member Further comprising a wedge member moving part connected to the second home insertion part and movably arranged in the wedge member moving hole and the exposed space. Screw remover.

10. In paragraph 9, The above body member is further formed with a movement guide groove that is connected to the wedge member movement hole and the exposed space and guides the movement of the wedge member movement part. The above wedge member moving part is formed with a moving guide protrusion that is movably inserted into the moving guide groove. Screw remover.

11. In paragraph 10, The above moving guide projection protrudes further than the circumferential surface of the moving part of the wedge member in the radial direction. Screw remover.

12. In paragraph 1, The above pressurizing member A pressure moving part arranged to be movable in the forward and backward direction on the body part to pressurize the wedge part, and Including a handle portion extending from the pressurized moving portion to form a predetermined angle with the forward and backward direction, Screw remover.

13. In paragraph 1, The size of the second home insertion portion is smaller than the size of the first home insertion portion. Screw remover.

14. In paragraph 13, In the above first home insertion portion, a first guide surface is further formed that is connected to the first pressure induction surface so as to form a predetermined angle with the first pressure induction surface, The second home insertion portion is further provided with a second guide surface that is connected to the second pressure-inducing surface to form a predetermined angle with the second pressure-inducing surface and faces the first guide surface. Screw remover.

15. A body member including a first home insert and extending in the front-rear direction; and It includes a second home insertion portion and a wedge member arranged to be movable in the forward and backward direction with respect to the body member, A first pressure-inducing surface is formed in the first home insertion portion, and a second pressure-inducing surface is formed in the second home insertion portion so as to face the first pressure-inducing surface. The above wedge member is, At least one of the first groove insertion portion and the second groove insertion portion is in an engagement release position where they do not push against each other in a direction perpendicular to at least one of the first pressure-inducing surface and the second pressure-inducing surface, or at least one of the first groove insertion portion and the second groove insertion portion is in an engagement position where the first pressure-inducing surface and the second pressure-inducing surface are arranged to face each other and push against each other in a direction perpendicular to at least one of the first pressure-inducing surface and the second pressure-inducing surface. Screw remover.

16. In paragraph 15, The above wedge member is arranged to be selectively connected to at least a portion of the body member, The above body member, Including a pressurized connecting part that pressurizes the wedge member to move in the forward and backward direction by moving in the forward and backward direction. Screw remover.

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