Screw removal device

Abstract

A screw removal device according to one embodiment of the present invention includes a main body member extending in the front-rear direction and including a first groove insertion portion; a wedge member including a second groove insertion portion and arranged to be movable in the front-rear direction relative to the main body member; and a pressurizing member arranged on the main body member so as to move the wedge member in the front-rear direction, wherein a first pressurizing guide surface is formed in the first groove insertion portion, and a second pressurizing guide surface is formed in the second groove insertion portion so as to face the first pressurizing guide surface, and the wedge member can be positioned in a disengaged position in which at least one of the first groove insertion portion and the second groove insertion portion is not pressed against each other in a direction perpendicular to the first pressurizing guide surface and at least one of the second pressurizing guide surface, or in an engaged position in which the first pressurizing guide surface and the second pressurizing guide surface face each other, and at least one of the first groove insertion portion and the second groove insertion portion is pressed against each other in a direction perpendicular to the first pressurizing guide surface and at least one of the second pressurizing guide surface.

Description

Technical Field

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

Background Art

[0002] In recent years, when performing fracture and bone correction surgeries in the field of orthopedics, locking compression plates and multi-angle locking screws for fixing the locking compression plates to bones are widely used. Usually, multi-angle locking screws having hexagonal or star-shaped insertion grooves formed in the screw heads are widely used.

[0003] After sufficient bone healing is obtained through fracture and bone correction surgeries or procedures, the multi-angle locking screws and plates may need to be removed. Even when bone healing cannot be achieved, the metal material must be removed when situations such as infection or plate fracture occur.

[0004] The biggest problem when using locking compression plates and multi-angle locking screws is that the heads of the multi-angle locking screws are damaged during metal removal surgery.

[0005] When a metal multi-angle locking screw is fixed to a bone and a certain period of time has passed and bone healing progresses, the bonding force between the bone and the screw increases. In such a case, when removing the multi-angle locking screw, due to the high bonding force between the screw and the bone, the multi-shaped insertion groove formed in the screw head may be crushed.

[0006] When the multi-shaped insertion groove formed in the head of the multi-angle locking screw is damaged, it becomes difficult to remove the screw with an ordinary driver. Therefore, there is a problem that if it is removed using a conventional driver for removing multi-angle locking screws or if this method fails, the screw head has to be shaved off using special equipment (bar, burr) to remove the screw.

[0007] Conventional multi-sided locking screw removal drivers allow the screw to be removed by fitting the driver into the multi-sided insertion groove formed in the head of the multi-sided locking screw. In this case, the multi-sided locking screw can be loosened by rotating the removal driver with a constant force and direction while precisely aligning it perpendicular to the multi-sided insertion groove in the screw head.

[0008] When removing conventional polygonal locking screws, a gap inevitably forms between the removal driver and the polygonal insertion groove in the screw head. This gap reduces the contact force between the polygonal insertion groove in the screw head and the removal driver, making screw removal difficult, and the removal driver itself can become damaged after only a few uses.

[0009] Furthermore, the gap between the screw and the screw remover reduces the contact force between the screw remover and the screw, which can damage the polygonal insertion groove formed in the screw head. In such cases, during the process of removing the screw head and locking compression plate using a special instrument (burr), tiny metal fragments may remain in the patient's body, causing inflammation and infection due to foreign matter. [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] The embodiments of the present invention were invented in view of the above-mentioned background, and aim to provide a screw removal device that can remove a screw from a screw coupling member to which a screw is coupled without damaging the insertion groove formed in the screw head.

[0011] Furthermore, the objective is to provide a screw removal device that can easily remove the screw from the screw coupling member even if the insertion groove is already damaged.

[0012] Furthermore, the objective is 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 groove. [Means for solving the problem]

[0013] A screw removal device according to one aspect of the present invention includes a main body member extending in the front-rear direction and including a first groove insertion portion; a wedge member including a second groove insertion portion and arranged to be movable in the front-rear direction relative to the main body member; and a pressurizing member arranged on the main body member so as to move the wedge member in the front-rear direction, wherein a first pressurizing guide surface is formed in the first groove insertion portion, and a second pressurizing guide surface is formed in the second groove insertion portion so as to face the first pressurizing guide surface, and the wedge member can be placed in an engagement position in which at least one of the first groove insertion portion and the second groove insertion portion is not pressed against each other in a direction perpendicular to at least one of the first pressurizing guide surface and the second pressurizing guide surface, or in an engagement position in which the first pressurizing guide surface and the second pressurizing guide surface face each other, and at least one of the first groove insertion portion and the second groove insertion portion is pressed against each other in a direction perpendicular to at least one of the first pressurizing guide surface and the second pressurizing guide surface.

[0014] Furthermore, when the wedge member is placed in the engagement position and the first groove insertion portion and the second groove insertion portion are viewed in the front-rear direction, the first groove insertion portion and the second groove insertion portion can form a polygonal shape.

[0015] Furthermore, the polygon can be hexagonal or star-shaped.

[0016] Furthermore, the first and second pressure-guiding surfaces can be tilted such that the first angle, which is the acute angle between the normal to the first pressure-guiding surface and the imaginary line in the front-rear direction, is greater than the second angle, which is the acute angle between the normal to the second pressure-guiding surface and the imaginary line in the front-rear direction.

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

[0018] Furthermore, the first groove insertion portion may have a first guide surface formed thereon that is connected to the first pressure guiding surface so as to form a predetermined angle with the first pressure guiding surface, and the second groove insertion portion may have a second guide surface formed thereon that is connected to the second pressure guiding surface so as to form a predetermined angle with the second pressure guiding surface and is facing the first guide surface.

[0019] Furthermore, the main body member may be formed with a wedge member movement hole, which is connected to the first pressure induction surface and in which the wedge member is movably positioned.

[0020] Furthermore, the wedge member and the pressurizing member are connected to the wedge member movement hole in the main body member so that they can be moved, and an exposed space that is exposed to the outside can be formed.

[0021] Furthermore, at least a portion of the pressurizing member can be movably arranged in the main body member, and a pressurizing member movement hole can be formed which is connected to the exposed space.

[0022] The screw removal device according to claim 7, further comprising: an intermediate member connected to the first groove insertion portion, in which the wedge member movement hole, the exposed space, and a part of the pressure member movement hole are formed; and a gripping portion connected to the intermediate member, in which another part of the pressure member movement hole is formed.

[0023] Furthermore, the wedge member may be connected to the second groove insertion portion and may further include a wedge member moving portion that is movably positioned between the wedge member moving hole and the exposed space.

[0024] Further, the main body member is further formed with a movement guide groove that is connected to the wedge member movement hole and the exposure space and guides the movement of the wedge member movement portion, and the wedge member movement portion can be formed with a movement guide protrusion that is movably inserted into the movement guide groove.

[0025] Further, the movement guide protrusion can protrude from the peripheral surface of the wedge member movement portion in the radial direction.

[0026] Further, the pressing member can include a pressing movement portion that is disposed movably in the front-rear direction on the main body member so as to press the wedge member, and a handle portion that extends from the pressing movement portion so as to form a predetermined angle with the front-rear direction.

Advantages of the Invention

[0027] According to an embodiment of the present invention, by increasing the adhesion force with the insertion groove formed in the screw head, the screw can be removed from the screw coupling member to which the screw is coupled without damaging the insertion groove, and even if the insertion groove is already damaged, the screw can be easily removed from the screw coupling member.

[0028] Furthermore, by providing a wedge member that conforms to the size and shape of the screw groove, there is an effect that the screw can be effectively removed.

Brief Description of the Drawings

[0029] [Figure 1] 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. [Figure 2] FIG. 2 is a perspective view showing when the wedge member of the screw removal device according to the first embodiment of the present invention is placed at the engagement release position, an enlarged view and a plan view of the first groove insertion portion and the second groove insertion portion. [Figure 3]Figure 3 shows an enlarged view and a plan view of the first groove insertion portion and the second groove insertion portion, respectively, when the wedge member of the screw removal device according to the first embodiment of the present invention is placed in the engagement position. [Figure 4] Figure 4 is a diagram showing the state of use of the screw removal device according to the first embodiment of the present invention, and is a plan view showing that the screw removal device has been moved to the location where the screw is connected to the screw coupling member. [Figure 5] Figure 5 is a diagram showing the usage state of a screw removal device according to the first embodiment of the present invention, and is a plan view and an enlarged view showing that the wedge member of the screw removal device is in the disengaged position and the first groove insertion portion of the main body member is inserted into the screw insertion groove. [Figure 6] Figure 6 is a diagram showing the usage state of a screw removal device according to the first embodiment of the present invention, in a plan view and an enlarged view, showing that the first groove insertion portion of the main body member is inserted into the screw insertion groove, the wedge member is moved to the engagement position by the pressurizing member, and at least a part of the first groove insertion portion and at least a part of the second groove insertion portion are in close contact with at least a part of the screw insertion groove. [Figure 7] Figure 7 is a plan view showing the state of use of a screw removal device according to the first embodiment of the present invention, in which at least a portion of the first groove insertion part and at least a portion of the second groove insertion part are in close contact with at least a portion of the screw insertion groove, and the screw removal device rotates in the direction that loosens the screw, thereby removing the screw from the screw coupling member. [Figure 8] Figure 8 shows an exploded perspective view of a screw removal device according to a second embodiment of the present invention, as well as enlarged views of the first groove insertion section and the second groove insertion section. [Figure 9] Figure 9 is a perspective view showing the wedge member of the screw removal device according to the second embodiment of the present invention in the disengaged position, as well as an enlarged view and a side view of the first groove insertion portion and the second groove insertion portion. [Figure 10] Figure 10 is a perspective view showing the wedge member of the screw removal device according to the second embodiment of the present invention in the engagement position, as well as an enlarged view and a side view of the first groove insertion portion and the second groove insertion portion. [Figure 11]Figure 11 is a side view and an enlarged view showing the first groove insertion portion of the main body member inserted into the screw insertion groove with the wedge member of the screw removal device according to the second embodiment of the present invention in the disengaged position. [Figure 12] Figure 12 is a side view and an enlarged view showing that, in the state in which the first groove insertion portion of the main body member of the screw removal device according to the second embodiment of the present invention is inserted into the screw insertion groove, the wedge member is moved to the engagement position by the pressurizing member, and at least a part of the first groove insertion portion and at least a part of the second groove insertion portion are in close contact with at least a part of the screw insertion groove. [Figure 13] Figure 13 is an exploded perspective view of a screw removal device according to a third embodiment of the present invention. [Figure 14] Figure 14 is a perspective view showing the wedge member of the screw removal device according to the third embodiment of the present invention in the disengaged position, as well as an enlarged view and a side view of the first groove insertion portion and the second groove insertion portion. [Figure 15] Figure 15 is a perspective view showing the wedge member of the screw removal device according to the third embodiment of the present invention in the engagement position, as well as an enlarged view and a side view of the first groove insertion part and the second groove insertion part. [Figure 16] Figure 16 is a side view and an enlarged view showing the first groove insertion portion of the main body member inserted into the screw insertion groove with the wedge member of the screw removal device according to the third embodiment of the present invention in the disengaged position. [Figure 17] Figure 17 is a side view and an enlarged view showing that, with the wedge member of the screw removal device according to the third embodiment of the present invention in the engagement position, at least a portion of the first groove insertion part and at least a portion of the second groove insertion part are in close contact with at least a portion of the screw insertion groove. [Modes for carrying out the invention]

[0030] In the following sections, specific embodiments for realizing the technical concept of the present invention will be described in detail with reference to the drawings.

[0031] In describing the present invention, if it is determined that a specific description of a related known configuration or function may obscure the gist of the invention, such detailed description will be omitted.

[0032] Furthermore, when it is mentioned that one component is "connected," "supported," or "in contact" with another component, it should be understood that while it may also be directly connected, supported, linked, supplied, transmitted, or in contact with the other component, there may be other components in between.

[0033] The terms used herein are used solely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0034] Furthermore, the terms used in this specification, such as upper, lower, front-rear direction, front, and rear, are explained based on those shown in the drawings, and it should be made clear in advance that they may be expressed differently if the direction of the object changes. For the same reason, in the attached drawings, some parts are shown. The components are shown in an exaggerated, simplified, or schematic manner, and the size of each component does not directly reflect its actual size.

[0035] Furthermore, terms including ordinal numbers such as "first," "second," etc., can be used to describe various components, but the components are not limited by such terms. These terms are used solely for the purpose of distinguishing one component from another.

[0036] As used herein, "includes" embodies a particular characteristic, domain, integer, stage, operation, element and / or component, and does not exclude the existence or addition of other particular characteristics, domains, integers, stages, operations, elements, components and / or groups.

[0037] The specific configuration of the screw removal device according to the first embodiment of the present invention will be described below with reference to Figures 1 to 3. The screw removal device 1 is a device for removing a screw 2 from a screw coupling 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 portion 2-1 with screw threads 2-11 formed on at least a portion of its outer circumference, and a screw head portion 2-2 connected to the upper part of the screw body portion 2-1 and having an insertion groove 2-21 formed therein. The screw removal device 1 can be configured so that at least a portion of it is engaged with the insertion groove 2-21 of the screw 2, or to be released from being engaged. In other words, the screw removal device 1 can be configured so that at least a portion of it is interference-fitted with the insertion groove 2-21 of the screw 2, or to be released from being interference-fitted. With at least a portion of the screw removal device 1 engaged with the insertion groove 2-21 of the screw 2, the screw 2 rotates together with the screw removal device 1, causing the screw 2 to loosen from the screw coupling member 3, and the screw 2 can be removed from the screw coupling member 3. The screw removal device 1 may include a main body member 100, a wedge member 200, and a pressurizing member 300.

[0038] Referring to Figures 1 to 3, the main body member 100 can support the movement of the wedge member 200 and the pressurizing member 300. In other words, the wedge member 200 and the pressurizing member 300 can be movably positioned relative to the main body member 100. Furthermore, a portion of the main body member 100 can be inserted into the insertion groove 2-21 of the screw 2. This portion of the main body member 100, while inserted into the insertion groove 2-21 of the screw 2, can engage with a portion of the wedge member 200 as the wedge member 200 moves. The main body member 100 can extend in the front-rear direction. The front-rear direction in which the main body member 100 extends may be the direction in which the wedge member 200 and the pressurizing member 300 move. Furthermore, the main body member 100 can support the wedge member 200 and the pressurizing member 300 so that they move in the front-rear direction. In other words, the wedge member 200 and the pressurizing member 300 may be arranged on the main body member 100 so as to be movable in the front-rear direction.

[0039] A pressure member movement hole 100-1 can be formed in the main body member 100. At least a portion of the pressure member 300 may be movably arranged in the pressure member movement hole 100-1. The pressure member movement hole 100-1 extends in the front-rear direction, and a pressure moving part 310, described later, may be movably arranged in the front-rear direction. The pressure member movement hole 100-1 may be connected to an exposed space 120-2, described later. Female threads (not shown) may be formed in the pressure member movement hole 100-1. In addition, the pressure moving part 310 may be moved while rotating in the pressure member movement hole 100-1. The main body member 100 may include a first groove insertion part 110, an intermediate part 120, and a gripping part 130.

[0040] The first groove insertion portion 110 can be inserted into the insertion grooves 2-21 of the screw 2. The first groove insertion portion 110 may have a polygonal shape when viewed from the front-rear direction. For example, when viewed from the front-rear direction, the first groove insertion portion 110 may have a trapezoidal shape. In other words, the first groove insertion portion 110 can have a polygonal prism shape including a trapezoidal prism. Furthermore, when the first groove insertion portion 110 and the second groove insertion portion 210 are viewed in the front-rear direction with the wedge member 200 in the engagement position, the first groove insertion portion 110 and the second groove insertion portion 210 can 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-rear direction with the wedge member 200 in the engagement position, the first groove insertion portion 110 and the second groove insertion portion 210 can have a hexagonal shape or a star shape, etc. In other words, with the wedge member 200 in the engagement position, the first groove insertion portion 110 and the second groove insertion portion 210 can form a polygonal prism such as a hexagonal prism or a star-shaped prism.

[0041] A first pressure-guiding surface 111 may be formed in the first groove insertion portion 110. The first pressure-guiding surface 111 may be an inclined surface. The first pressure-guiding surface 111 may be formed inclined such that the cross-section of the first groove insertion portion 110 perpendicular to the front-rear direction becomes larger as it moves forward. The first pressure-guiding surface 111 may also form a first angle α1, which is an acute angle between the normal NL to the first pressure-guiding surface 111 and a virtual line IL in the front-rear direction. Furthermore, the first pressure-guiding surface 111 may be formed inclined such that the first angle α1 is larger than the second angle α2, which will be described later, and is an acute angle between the normal NL to the second pressure-guiding surface 211 and a virtual line IL in the front-rear direction.

[0042] The intermediate portion 120 of the member can support the movement of the wedge member 200. The intermediate portion 120 of the member can also be connected to the gripping portion 130. The intermediate portion 120 of the member can also be connected to the first groove insertion portion 110. The intermediate portion 120 of the member extends in the front-rear direction and can support the wedge member 200 and the pressurizing member 300 so that the wedge member 200 and the pressurizing member 300 move in the front-rear direction. The intermediate portion 120 of the member may have a wedge member movement hole 120-1, an exposed space 120-2, a movement guide groove 120-3, and a portion of the pressurizing member movement hole 100-1 formed therein.

[0043] The wedge member movement hole 120-1 may be formed in the intermediate portion 120 of the member so as to be connected to the first pressure induction surface 111. The wedge member 200 may be positioned in the wedge member movement hole 120-1 so as to be movable in the front-rear direction. The wedge member movement hole 120-1 may extend in the front-rear direction.

[0044] The exposed space 120-2 is connected to the wedge member movement hole 120-1 and may be formed in the intermediate portion 120 of the member so as to be exposed to the outside. The wedge member 200 and the pressurizing member 300 may be arranged in the exposed space 120-2 so as to be movable in the front-rear direction. The exposed space 120-2 may extend in the front-rear direction.

[0045] 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 movement section 220, which will be described later and is included in the wedge member 200. The movement guide groove 120-3 can be connected to the wedge member movement hole 120-1 and the exposed space 120-2. The movement guide groove 120-3 may extend in the front-rear direction. In addition, a movement guide projection 220-1, which will be described later and formed on the wedge member movement section 220, can be inserted into the movement guide groove 120-3 so as to be movable in the front-rear direction.

[0046] The gripping portion 130 can be gripped by a user (not shown) while supporting the movement of the pressurizing member 300. The gripping portion 130 can be connected to the intermediate portion 120 of the member. The gripping portion 130 may extend in the front-rear direction. Another part of the pressurizing member movement hole 100-1 may be formed in the gripping portion 130. The pressurizing movement portion 310 of the pressurizing member 300 may be arranged in the pressurizing member movement hole 100-1 of the gripping portion 130 so as to be movable in the front-rear direction. A gripping surface 130-1 that can be gripped by a user may be formed on the outer surface of the gripping portion 130. The gripping surface 130-1 may be flat and there may be multiple gripping surfaces. For example, two gripping surfaces 130-1 may be provided, with one of the two gripping surfaces 130-1 formed on the upper side of the gripping portion 130 and the other formed on the lower side of the gripping portion 130.

[0047] The wedge member 200 may be positioned to be movable in the front-rear direction relative to the main body member 100. Depending on the position it has moved to, the wedge member 200 may be placed in a disengaged position or an engaged position. The disengaged position is a position in which at least one of the first groove insertion portion 110 and the second groove insertion portion 210 (described later) is not pressed against each other in a direction perpendicular to at least one of the first pressure guide surface 111 and the second pressure guide surface 211 (described later). The engaged position is a position in which the first pressure guide surface 111 and the second pressure guide surface 211 are positioned facing each other, and at least one of the first groove insertion portion 110 and the second groove insertion portion 210 is pressed against each other in a direction perpendicular to at least one of the first pressure guide surface 111 and the second pressure guide surface 211. When a portion of the main body member 100 is inserted into the insertion groove 2-21 of the screw 2, and a portion of the wedge member 200 is placed in the disengagement position, the portion of the wedge member 200 can not engage with the portion of the main body member 100. Conversely, when a portion of the wedge member 200 is placed in the engagement position while a portion of the main body member 100 is inserted into the insertion groove 2-21 of the screw 2, the portion of the wedge member 200 can engage with the portion of the main body member 100. Furthermore, a portion of the wedge member 200 and a portion of the main body member 100 can be tightly fitted into the insertion groove 2-21 of the screw 2. In other words, a portion of the wedge member 200 and a portion of the main body member 100 can be interference-fitted into the insertion groove 2-21 of the screw 2. Such a wedge member 200 can extend in the front-rear direction. The wedge member 200 may include a second groove insertion portion 210 and a wedge member movement portion 220.

[0048] The second groove insertion portion 210 can be disengaged from the first groove insertion portion 110 when the wedge member 200 is placed in the disengaged position, allowing the first groove insertion portion 110 to be inserted into the insertion groove 2-21 of the screw 2. Alternatively, the second groove insertion portion 210 can be engaged with the first groove insertion portion 110 when the wedge member 200 is placed in the engaged position while the first groove insertion portion 110 is inserted into the insertion groove 2-21 of the screw 2. Furthermore, at least a portion of the second groove insertion portion 210 and at least a portion of the first groove insertion portion 110 can 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 engaged position, the second groove insertion portion 210 can be interfered with together with the first groove insertion portion 110 in the insertion groove 2-21 of the screw 2.

[0049] The second groove insertion portion 210 may have a polygonal shape when viewed from the front-to-back direction. For example, when viewed from the front-to-back direction, the second groove insertion portion 210 may have a trapezoidal shape. In other words, the second groove insertion portion 210 can have a polygonal prism shape including a trapezoidal prism. Furthermore, when the wedge member 200 is in the engagement position and the second groove insertion portion 210 and the first groove insertion portion 110 are viewed in the front-to-back direction, the second groove insertion portion 210 and the first groove insertion portion 110 can form a polygonal shape. For example, when the wedge member 200 is in the engagement position and the second groove insertion portion 210 and the first groove insertion portion 110 are viewed in the front-to-back direction, 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, with the wedge member 200 in the engagement position, the second groove insertion portion 210 and the first groove insertion portion 110 can form polygonal prisms such as hexagonal prisms or star-shaped prisms.

[0050] A second pressure-guiding surface 211 may be formed in the second groove insertion portion 210. The second pressure-guiding surface 211 may be formed to face the first pressure-guiding surface 111 of the first groove insertion portion 110. If the area where the second pressure-guiding surface 211 and the first pressure-guiding surface 111 face each other is called the facing area, the facing area at the engagement position of the wedge member 200 may be larger than the facing area at the disengagement position of the wedge member 200. The second pressure-guiding surface 211 may be an inclined surface. The second pressure-guiding surface 211 may be formed inclined such that the cross-section of the second groove insertion portion 210 perpendicular to the front-rear direction becomes smaller as it moves forward. In addition, the second pressure-guiding surface 211 can form a second angle α2 which is an acute angle between the normal NL to the second pressure-guiding surface 211 and the imaginary line IL in the front-rear direction. Furthermore, the second pressure induction surface 211 may be formed with an inclination such that the second angle α2 is smaller than the first angle α1, which is the acute angle between the normal to the first pressure induction surface 111 and the imaginary line IL in the front-rear direction.

[0051] The wedge member moving portion 220 can move in the front-rear direction relative to the main body member 100 together with the second groove insertion portion 210. The wedge member moving portion 220 can be connected to the second groove insertion portion 210. The wedge member moving portion 220 can extend in the front-rear direction. The wedge member moving portion 220 can be movably positioned in the wedge member moving hole 120-1 and exposed space 120-2 of the main body member 100. The wedge member moving portion 220 may have a moving guide projection 220-1 and a pressurized moving portion contact groove 220-2 formed thereon.

[0052] The movement guide projection 220-1 can be inserted into the movement guide groove 120-3 of the intermediate portion 120 of the main body member 100. The movement guide projection 220-1 may protrude radially beyond the circumferential surface of the wedge member movement portion 220. The movement guide projection 220-1 can be used not only to guide the movement of the wedge member 200, but also to move the wedge member 200, which has been moved to the engaged position, to the disengaged position.

[0053] One end of the pressurizing member 300 can come into contact with the pressurizing moving part contact groove 220-2. For example, the front end of the pressurizing moving part 310 can come into contact with the pressurizing moving part contact groove 220-2.

[0054] The pressurizing member 300 may be positioned on the main body member 100 so as to move the wedge member 200 in the front-rear direction. A portion of the pressurizing member 300 may rotate while moving in the front-rear direction. The pressurizing member 300 may include a pressurizing movement section 310 and a handle section 320.

[0055] The pressurized moving part 310 may be positioned in the main body member 100 so as to be movable in the front-rear direction to pressurize the wedge member 200. The pressurized moving part 310 may be inserted so as to penetrate the pressurized member moving hole 100-1 of the main body member 100. The pressurized moving part 310 may have male threads that engage with female threads formed in the pressurized member moving hole 100-1. The pressurized moving part 310 can move in the front-rear direction while rotating in the pressurized member moving hole 100-1 by a rotational force applied by the user via the handle part 320. In other words, the pressurized moving part 310 can move forward when rotated in one direction by the rotational force transmitted via the handle part 320, and move backward when rotated in the other direction which is the opposite direction. The front end of the pressurized moving part 310 can also contact the pressurized moving part contact groove 220-2 of the wedge member moving part 220 of the wedge member 200. Furthermore, the wedge member 200 can be pressed and moved by the movement of the pressurized moving part 310. For example, as 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.

[0056] The handle portion 320 may be configured to apply rotational force to the pressurized moving portion 310. In other words, when a user grips the handle portion 320 and rotates it, 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 front-rear 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 front-rear direction.

[0057] The operation and effects of the screw removal device 1 according to the first embodiment of the present invention, having the configuration described above, will be explained below with reference to Figures 4 to 7.

[0058] Referring to Figure 4, the user can move the screw removal device 1 to a position where the screw 2 to be removed is connected to the screw coupling member 3. Also, the wedge member 200 of the screw removal device 1 is placed in the disengaged position, and the front end of the pressurized moving portion 310 of the pressurized member 300 can contact the pressurized moving portion contact groove 220-2 of the wedge member moving portion 220 of the wedge member 200.

[0059] Referring to Figure 5, after moving the screw removal device 1 to a position where the screw 2 to be removed is connected to the screw coupling member 3, the user can grasp the gripping portion 130 of the main body member 100 of the screw removal device 1 and the handle portion 320 of the pressurizing member 300. In this state, the user can insert the first groove insertion portion 110 of the main body member 100 into the insertion groove 2-21 of the screw 2.

[0060] Referring to Figure 6, with the first groove insertion portion 110 of the main body member 100 inserted into the insertion groove 2-21 of the screw 2, the user can rotate the pressurizing member 300 by rotating the handle portion 320 so that the pressurizing member 300 moves forward. By moving the pressurizing member 300 forward, the wedge member 200 moves forward, and the wedge member 200 can move from the disengaged position to the engaged position. When the wedge member 200 is 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 may be positioned to face each other. In addition, at least one of the first groove insertion portion 110 and the second groove insertion portion 210 may be pressed against each other in a direction perpendicular to at least one of the first pressurizing guide surface 111 and the second pressurizing guide surface 211. Furthermore, at least a portion of the first groove insertion portion 110 and at least a portion of the second groove insertion portion 210 can be in close contact with the insertion groove 2-21 of the screw 2. In other words, the first groove insertion portion 110 and the second groove insertion portion 210 can be interference-fitted into the insertion groove 2-21 of the screw 2.

[0061] Referring to Figure 7, with at least a portion of the first groove insertion portion 110 and at least a portion of the second groove insertion portion 210 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 that loosens the screw 2. By rotating the screw removal device 1 in the direction that loosens the screw 2, the screw 2 loosens from the screw coupling member 3, and the screw 2 can be removed from the screw coupling member 3.

[0062] After removing the screw 2 from the screw coupling member 3, the user can rotate the pressurizing member 300 by rotating the handle portion 320 so that the pressurizing member 300 moves backward. As the pressurizing member 300 moves backward, the front end of the pressurizing movable portion 310 of the pressurizing member 300 can move away from the pressurizing movable portion contact groove 220-2 of the wedge member movable portion 220 of the wedge member 200 without contacting it.

[0063] In this state, the user can apply a rearward force to the movable guide projection 220-1 to move the wedge member 200 to the disengaged position. Furthermore, the screw 2 and the screw removal device 1 can be separated. Specifically, 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 main body member 100 can be separated from the insertion groove 2-21 of the screw 2, thereby separating the screw 2 and the screw removal device 1.

[0064] Thus, the screw removal device 1 according to the first embodiment of the present invention can increase the adhesion force 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 tightly fitted into the insertion groove 2-21 of the screw 2. Therefore, the screw 2 can be removed from the screw coupling 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 coupling member 3.

[0065] On the other hand, in addition to the above configuration, according to a second embodiment of the present invention, 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 may be further formed on the first groove insertion portion 110, and a second guide surface 212 may be further formed on the second groove insertion portion 210.

[0066] The second embodiment will be described below with reference to Figures 8 to 12. In describing the second embodiment of the present invention, compared with the first embodiment described above, the size of the second groove insertion portion 210 may be smaller than the size of the first groove insertion portion 110, the first groove insertion portion 110 has a further first guide surface 112 formed on it, and the second groove insertion portion 210 has a further second guide surface 212 formed on it. Therefore, the explanation will focus on these differences, and the same descriptions and reference numerals in the drawings will be applied mutatis mutandis to the above embodiment.

[0067] Referring to Figures 8 to 10, the size of the second groove insertion portion 210 may be smaller than the size of the first groove insertion portion 110. For example, the second groove insertion portion 210 may be one-quarter the size of a hexagonal prism or star-shaped prism, and the first groove insertion portion 110 may be three-quarters the size of a hexagonal prism or star-shaped prism. In other words, the size of the second groove insertion portion 210 may be one-third the size of the first groove insertion portion 110.

[0068] The first guide surface 112 can be connected to the first pressure induction surface 111 so as to form a predetermined angle with the first pressure induction surface 111. For example, the first guide surface 112 can be connected to the first pressure induction surface 111 so as to form a right angle with the first pressure induction surface 111 when viewed from 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 movement hole 120-1 can be connected to the first pressure induction surface 111 and the first guide surface 112.

[0069] The second guide surface 212 is connected to the second pressure-guiding surface 211 so as to form a predetermined angle with the second pressure-guiding surface 211 and can face the first guide surface 112. For example, the second guide surface 212 can be connected to the second pressure-guiding surface 211 so as to form a right angle with the second pressure-guiding surface 211. The second guide surface 212 can guide the movement of the wedge member 200 together with the first guide surface 112.

[0070] Referring to Figure 11, with the wedge member 200 of the screw removal device 1 in the disengaged position, the user can insert the first groove insertion portion 110 of the main body member 100 into the insertion groove 2-21 of the screw 2.

[0071] Referring to Figure 12, with the first groove insertion portion 110 inserted into the insertion groove 2-21 of the screw 2, the user can rotate the pressurizing member 300 using the handle portion 320 so that the pressurizing member 300 moves forward. By moving the pressurizing member 300 forward, the wedge member 200 moves forward, and the wedge member 200 can move from the disengaged position to the engaged position. When the wedge member 200 is 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 may be positioned to face each other. In addition, at least one of the first groove insertion portion 110 and the second groove insertion portion 210 may be pressed against each other in a direction perpendicular to at least one of the first pressurizing guide surface 111 and the second pressurizing guide surface 211. In addition, at least a portion of the first groove insertion portion 110 and at least a portion of the second groove insertion portion 210 may be in close contact with the insertion groove 2-21 of the screw 2. In other words, the first groove insertion portion 110 and the second groove insertion portion 210 can be interference-fitted into the insertion grooves 2-21 of the screw 2.

[0072] With at least a portion of the first groove insertion portion 110 and at least a portion of the second groove insertion portion 210 in close contact with the insertion groove 2-21 of the screw 2, the user can rotate the screw removal device 1 in a direction that loosens the screw 2. By rotating the screw removal device 1 in a direction that loosens the screw 2, the screw 2 loosens from the screw coupling member 3, and the screw 2 can be removed from the screw coupling member 3.

[0073] The third embodiment will be described below with reference to Figures 13 to 17. In describing the third embodiment of the present invention, compared to the first embodiment described above, the pressurizing member 300 can be used with the member removed, and the first groove insertion part body 110a, in which the first groove insertion part 110 is formed, is selectively connected to the intermediate part 120 of the member. The second groove insertion part 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 pressurizing connecting part 121 is positioned in the pressurizing connecting part moving hole 100-2 formed in the first groove insertion part body 110a and can move in the front-rear direction. The following description will focus on these differences, and the same descriptions and reference numerals in the drawings will be applied mutatis mutandis to the embodiments described above.

[0074] Referring to Figures 13 to 17, in the screw removal device 1 according to the third embodiment of the present invention, the first groove insertion portion 110 can be formed in the first groove insertion portion body 110a, and such a first groove insertion portion body 110a can be selectively connected to the intermediate portion 120 of the member. A pressurized connecting portion 121 can be formed at the end of the intermediate portion 120 of the member to which the first groove insertion portion body 110a can be selectively connected. In other words, the intermediate portion 120 of the member and the first groove insertion portion body 110a can be separated or connected. A pressurized connecting portion moving hole 100-2 can be formed in such a first groove insertion portion body 110a so as to be inserted into the pressurized connecting portion 121. Such a pressurized connecting portion 121 is positioned in the pressurized connecting portion moving hole 100-2 and can pressurize the wedge member 200 by moving in the front-rear direction relative to the first groove insertion portion body 110a. In other words, the screw removal device 1 does not have to include a pressurized member 300. Furthermore, the pressurized connecting portion 121 may have male threads that engage with the female threads formed in the pressurized connecting portion movable hole 100-2.

[0075] Furthermore, multiple second groove insertion portions 210 of the wedge member 200 can be provided based on the shape and size of the insertion grooves 2-21 of the screw 2. For example, when the intermediate portion 120 of the member and the first groove insertion portion body 110a are separated, one of multiple wedge members 200 connected to the first groove insertion portion 110 can be selected to match the shape and size of the insertion grooves 2-21 of the screw 2.

[0076] Although embodiments of the present invention have been described above as specific examples, these are merely illustrative, and the present invention is not limited thereto, but should be interpreted as having the broadest scope of the technical idea disclosed herein. Those skilled in the art can combine / substitute the disclosed embodiments to carry out patterns of shapes not specified, and this will not depart from the scope of the present invention. Furthermore, those skilled in the art can easily modify or transform the embodiments disclosed herein, and it is clear that such modifications or transformations also fall within the scope of the present invention.

Claims

1. A main body member extending in the front-rear direction, including a first groove insertion portion; A wedge member including a second groove insertion portion, which is arranged to be movable in the front-rear direction relative to the main body member; and The pressurizing member is positioned on the main body member so as to move the wedge member in the front-rear direction, A first pressure-guiding surface is formed in the first groove insertion portion, and a second pressure-guiding surface is formed in the second groove insertion portion so as to face the first pressure-guiding surface. The aforementioned wedge member is, At least one of the first groove insertion portion and the second groove insertion portion is positioned in a disengaged position where they are not pressed against each other in a direction perpendicular to at least one of the first pressure guiding surface and the second pressure guiding surface, or the first pressure guiding surface and the second pressure guiding surface are facing each other, and at least one of the first groove insertion portion and the second groove insertion portion is positioned in an engaged position where they are pressed against each other in a direction perpendicular to at least one of the first pressure guiding surface and the second pressure guiding surface. Screw removal device.

2. The screw removal device according to claim 1, characterized in that when the wedge member is placed in the engagement position and the first groove insertion portion and the second groove insertion portion are viewed in the front-rear direction, the first groove insertion portion and the second groove insertion portion form a polygonal shape.

3. The screw removal device according to claim 2, characterized in that the polygon is hexagonal or star-shaped.

4. The screw removal device according to claim 1, characterized in that the first pressure guidance surface and the second pressure guidance surface are inclined such that the first angle, which is the acute angle between the normal to the first pressure guidance surface and the imaginary line in the front-rear direction, is greater than the second angle, which is the acute angle between the normal to the second pressure guidance surface and the imaginary line in the front-rear direction.

5. The main body member The screw removal device according to claim 1, characterized in that a wedge member movement hole is formed, which is connected to the first pressurizing induction surface and in which the wedge member is movably positioned.

6. The main body member The screw removal device according to claim 5, characterized in that the wedge member and the pressurizing member are connected to the wedge member movement hole so as to be movable, and an exposed space is formed that is exposed to the outside.

7. The main body member The screw removal device according to claim 6, characterized in that at least a portion of the pressurizing member is movably arranged and a pressurizing member movement hole connected to the exposed space is formed.

8. The main body member is An intermediate member connected to the first groove insertion portion, in which the wedge member movement hole, the exposed space, and a part of the pressurizing member movement hole are formed; and The screw removal device according to claim 7, further comprising a gripping portion connected to the intermediate portion of the member, in which another part of the pressurizing member moving hole is formed.

9. The aforementioned wedge member is The screw removal device according to claim 7, further comprising a wedge member moving part connected to the second groove insertion part and movably disposed between the wedge member moving hole and the exposed space.

10. The main body member is further provided 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 screw removal device according to claim 9, characterized in that the wedge member moving portion has a moving guide projection that is movably inserted into the moving guide groove.

11. The screw removal device according to claim 10, characterized in that the moving guide projection protrudes radially beyond the circumferential surface of the wedge member moving portion.

12. The pressurizing member is A pressurizing moving part is arranged on the main body member so as to be movable in the front-rear direction to pressurize the wedge member, The screw removal device according to claim 1, characterized in that it includes a handle portion that extends from the pressurized moving portion so as to form a predetermined angle with the front-rear direction.

13. The screw removal device according to claim 1, characterized in that the size of the second groove insertion portion is smaller than the size of the first groove insertion portion.

14. The first groove insertion portion is further formed with a first guide surface connected to the first pressure guiding surface so as to form a predetermined angle with the first pressure guiding surface. The screw removal device according to claim 13, characterized in that the second groove insertion portion is further formed with a second guide surface which is connected to the second pressure guide surface so as to form a predetermined angle with the second pressure guide surface and which faces the first guide surface.

15. A main body member extending in the front-rear direction, including a first groove insertion portion; and It includes a second groove insertion portion and a wedge member that is movable in the front-rear direction relative to the main body member, A first pressure-guiding surface is formed in the first groove insertion portion, and a second pressure-guiding surface is formed in the second groove insertion portion so as to face the first pressure-guiding surface. The aforementioned wedge member is, A screw removal device characterized in that at least one of the first groove insertion portion and the second groove insertion portion is positioned in a disengaged position where they are not pressed against each other in a direction perpendicular to at least one of the first pressure guiding surface and the second pressure guiding surface, or where the first pressure guiding surface and the second pressure guiding surface face each other, and at least one of the first groove insertion portion and the second groove insertion portion is positioned in an engaged position where they are pressed against each other in a direction perpendicular to at least one of the first pressure guiding surface and the second pressure guiding surface.

16. The wedge member is arranged to be selectively connected to at least a portion of the main body member. The main body member is, The screw removal device according to claim 15, characterized in that it includes a pressurizing connecting part that pressurizes the wedge member so that it moves in the front-rear direction by moving in the front-rear direction.

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