TWM621263U - Screws, screwdrivers and combination of screw and screwdriver - Google Patents

Abstract

A screw includes a stud and a screw head. The screw head is arranged at one end of the stud and defines an axis together with the stud. The screw head includes an end surface opposite to one end of the stud, and a plurality of holding parts. The screw head is formed with a A guide hole whose end surface is recessed in the direction of the stud and extends along the axis. The retaining portions are located around the guide hole and are arranged at intervals around the axis. Each of the retaining portions and the end surface are opposite to each other along the axis. With a distance, each of the holding parts extends in a radial direction perpendicular to the axis. In this way, the screw can have a good anti-theft effect. The model also provides a screwdriver and a combination of screw and screwdriver.

Description

Screws, screwdrivers and combinations of screws and screwdrivers

The invention relates to a screw, a screwdriver, and a combination of a screw and a screwdriver, in particular to a screw, a screwdriver, and a combination of a screw and a screwdriver with an anti-theft function.

Existing screws with anti-theft function usually form a groove with a special shape on the end surface of the screw head. A screwdriver with a shape corresponding to the groove is inserted into the groove to drive the screw to rotate. In or out.

Since the groove is only recessed by the top surface along the axial direction of the screw, people who are interested in inserting the groove through other screwdrivers or tools similar to the groove can still generate force points and rotate the screw. Therefore, the anti-theft effect of this screw is not good.

Therefore, one of the objectives of the present invention is to provide a screw that can overcome at least one of the disadvantages of the prior art.

Therefore, the screw of the present invention includes a stud and a screw head. The screw head is arranged at one end of the stud and defines an axis together with the stud. The screw head includes an end surface opposite to one end of the stud, and a plurality of holding parts. The screw head is formed with a A guide hole with an end surface recessed in the direction of the stud and extending along the axis, the holding portions are located around the guide hole and spaced around the axis, and each holding portion is spaced from the end surface along the axis A distance, each of the holding parts extends in a radial direction perpendicular to the axis.

In some embodiments, each of the holding portions has a groove extending from the outer periphery of the guiding hole along the radial direction of the head and communicating with the guiding hole.

In some embodiments, each of the holding portions further has two holding surfaces respectively located on opposite sides of the groove, and the holding surfaces are spaced apart and parallel to each other along the other head radial direction perpendicular to the head radial direction.

In some embodiments, each of the holding portions has two holding surfaces, and the holding surfaces are spaced apart and parallel to each other along the other head radial direction perpendicular to the head radial direction.

In some embodiments, the screw head further includes a stopping surface between the stud and the holding portions and facing the holding portions, and a stop surface protruding from the stopping surface and located in the guide hole The inner jacking boss.

In some embodiments, the pushing protrusion has a hemispherical surface and an outer peripheral surface connected between the blocking surface and the hemispherical surface.

In some embodiments, the end surface has a circular ring shape.

In some embodiments, the guide hole has a plurality of alignment grooves that surround the axis at angular intervals and are aligned with the holding portions.

In some embodiments, the screw head further includes a plurality of arc-shaped chamfered surfaces surrounding the axis at angular intervals, and each of the arc-shaped chamfered surfaces is located at the corresponding holding portion and the corresponding alignment groove portion between.

Another object of the present invention is to provide a screwdriver that can overcome at least one of the disadvantages of the prior art.

Therefore, the screwdriver of the present invention includes a grip rod and a plurality of holding arms. The grip rod extends along an axis. The holding arms are arranged on the grip rod and surround the axis at angular intervals and are arranged in a ring shape, each of the holding arms includes a connecting arm body movably connected to the grip rod and partially exposed outside the grip rod, And a holding portion protruding outside the connecting arm body and located outside the grip, the holding arms can be operated to change between a closed state and an expanded state, when the holding arms are in the closed state , The holding parts of the holding arms are close to each other, and when the holding arms are in the expanded state, the holding parts of the holding arms are far away from each other.

In some embodiments, the connecting arm body has an outer surface and a head end located outside the grip, and the holding part is a block protruding from the outer surface and adjacent to the head end.

In some embodiments, the outer surface is arc-shaped, and the holding portion protrudes outward from the outer surface along a radial direction of an arm. The other arm in the radial direction of the arm is spaced apart and parallel to each other in the radial direction.

In some embodiments, the holding portion further has a first outer arc chamfered surface opposite to the end of the grip, and a second outer arc opposite to the first outer arc chamfered surface Shaped chamfered surface.

In some embodiments, the connecting arm body has an inner arc chamfered surface located inside the holding portion.

In some embodiments, the connecting arm body is formed with an accommodating groove located inside the holding portion, and the connecting arm body further has two abutting edges respectively located on opposite sides of the accommodating groove.

In some embodiments, the connecting arm body of each holding arm is pivotally connected to the grip rod rotatably, and the screwdriver further includes a set of the connecting arm bodies provided on the holding arms to apply elasticity thereto Elastic ring that constricts force.

In some embodiments, the grip includes a shell and a limiting bead arranged in the shell, and the connecting arm body of each holding arm is pivotally connected between the shell and the limiting bead. And can rotate around the limit bead.

In some embodiments, the housing is formed with an accommodating space, and a plurality of pivoting portions surrounding the axis at angular intervals and located outside the accommodating space, each of the pivoting portions has a pivoting groove, The pivotal groove extends radially outward along a shell and communicates with the accommodating space. The connecting arm body has an arm portion that is partially accommodated in the accommodating space, and a pivotal plate portion. The arm portion has a A tail end located in the accommodating space, and a concave arc surface adjacent to the tail end and abutting on the limiting bead, the arm portions of the holding arms adjacent to the tail end are covered by the limiting bead Expanded outwards to maintain a proper distance, the pivotal plate portion protrudes radially outward along an arm from the side of the arm portion opposite to the concave arc surface, and is adjacent to the tail end and pivotally pivoted to the corresponding The pivot slot.

In some embodiments, each of the pivoting portions further has two pressing surfaces respectively located on opposite sides of the pivoting groove, and the pressing surfaces are spaced apart along another shell radial direction perpendicular to the shell radial direction And are parallel to each other, the pivotal plate portion has two pressure surfaces facing the corresponding pressure surfaces, and the pressure surfaces are spaced apart and parallel to each other along the other arm radial direction perpendicular to the arm radial direction.

Another object of the present invention is to provide a screw and screwdriver combination that can overcome at least one of the disadvantages of the prior art.

Therefore, the combination of the screw and the screwdriver of the present invention includes a screw and a screwdriver. The screw includes a stud and a screw head. The screw head is arranged at one end of the stud and defines a first axis together with the stud. The screw head includes an end surface opposite to one end of the stud, and a plurality of first holding parts. The screw head A guide hole recessed from the end surface toward the stud and extending along the first axis is formed. The first holding portions are located around the guide hole and are arranged at intervals around the first axis. Each of the The first holding portion and the end surface are separated by a distance along the first axis, and each of the first holding portions extends in a radial direction perpendicular to the first axis. The screwdriver is used to be inserted into the screw and includes a grip rod and a plurality of holding arms. The grip rod extends along a second axis. The holding arms are arranged on the grip rod and surround the second axis at angular intervals and are arranged in a ring shape. Each of the holding arms includes a connecting arm movably connected to the grip rod and partially exposed outside the grip rod Body, and a second holding portion protruding outside the connecting arm body and located outside the grip, the connecting arm body is used for inserting into the guide hole, and the second holding portion is used for holding the corresponding The first holding part, the holding arms can be operated to change between a closed state and an expanded state, when the holding arms are in the closed state, the second holding parts of the holding arms are close to each other , So that the second holding parts can be inserted into the guide hole. When the holding arms are in the expanded state, the second holding parts of the holding arms are far away from each other, so that the second holding parts It can be respectively held on the first holding parts.

In some embodiments, each of the first holding portions has a groove extending radially outward from the outer periphery of the guiding hole along the head and communicating with the guiding hole, and the connecting arm body has an outer surface , And a head end located outside the grip, the second holding part is a block protruding from the outer surface and adjacent to the head end to be clamped to the corresponding card slot of the first holding part .

In some embodiments, each of the first holding portions further has two holding surfaces respectively located on opposite sides of the slot, and the holding surfaces are spaced apart from each other along the other head radial direction perpendicular to the head radial direction. Parallel, the outer surface is arc-shaped, the second holding portion protrudes outward from the outer surface along an arm radially, and the second holding portion has two force application surfaces for abutting against the holding surfaces, respectively , The force application surfaces are spaced apart and parallel to each other along another arm radial direction perpendicular to the arm radial direction.

In some embodiments, the screw head further includes a stopping surface between the stud and the first holding parts and facing the first holding parts, and a stopping surface protruding from the stopping surface and located at The pushing protrusion in the guide hole, the stopping surface is used to stop the holding arms, and the pushing protrusion is used to push the holding arms to transform the holding arms from the closed state to the Expanded state.

In some embodiments, the pushing protrusion has a hemispherical surface, and the connecting arm body has an inner arc chamfered surface located inside the second holding portion for pushing the hemispherical surface.

In some embodiments, the connecting arm body is formed with a receiving groove located inside the second holding portion for accommodating a part of the pushing protrusion, and the pushing protrusion further has a receiving groove connected to the stopper. The connecting arm body also has two abutting edges located on opposite sides of the accommodating groove, and each of the abutting edges can abut against the outer circumferential surface through a line contact method. Slide on the outer peripheral surface.

In some embodiments, the screw head further includes a pushing protrusion located in the guide hole, and the pushing protrusion is used to push the holding arms to transform the holding arms from the closed state to In the unfolded state, the connecting arm body of each of the holding arms is pivotally connected to the grip rod rotatably, and the screwdriver further includes a set of the connecting arm bodies provided on the holding arms to apply elastic constricting force to them The elastic ring.

In some embodiments, the grip includes a shell and a limiting bead arranged in the shell, and the connecting arm body of each holding arm is pivotally connected between the shell and the limiting bead. And can rotate around the limit bead.

In some embodiments, the housing is formed with an accommodating space, and a plurality of pivotal portions that surround the second axis at an angular interval and are located outside the accommodating space, each of the pivotal portions has a pivotal connection Groove, the pivotal groove extends radially outward along a shell and communicates with the accommodating space, the connecting arm body has an arm portion that is partially accommodated in the accommodating space, and a pivotal plate portion, the arm portion It has a tail end located in the accommodating space, and a concave arc surface adjacent to the tail end and abutting on the limiting bead. The position bead is spread outward to maintain a proper distance. The pivotal plate portion is protruded radially outward along an arm from the side of the arm portion opposite to the concave arc surface, and is adjacent to the tail end and pivotally connected to it rotatably Corresponding to the pivot slot.

In some embodiments, each of the pivoting portions further has two pressing surfaces respectively located on opposite sides of the pivoting groove, and the pressing surfaces are spaced apart along another shell radial direction perpendicular to the shell radial direction And are parallel to each other, the pivotal plate portion has two pressure surfaces facing the corresponding pressure surfaces, and the pressure surfaces are spaced apart and parallel to each other along the other arm radial direction perpendicular to the arm radial direction.

In some embodiments, the end surface has a circular ring shape.

In some implementations, the guide hole has a plurality of alignment grooves that surround the first axis at an angular interval and are aligned with the first holding portions, and the alignment grooves are respectively used for A part of the second holding portions is inserted, the end surface has a plurality of inner end edges respectively located outside the aligning groove portions, the second holding portion also has a first outer arc-shaped chamfered surface, the first The outer arc-shaped chamfered surface is arranged such that when the second holding portion is inserted into the corresponding alignment groove portion of the guide hole and contacts the corresponding inner end edge, the first outer arc-shaped chamfered surface will correspond to the corresponding inner end edge. Sliding on the inner end edge and being guided by it in the direction of insertion.

In some embodiments, the screw head further includes a plurality of arc-shaped chamfered surfaces surrounding the first axis at angular intervals, and each of the arc-shaped chamfered surfaces is located at the corresponding first holding portion and the corresponding one Between the aligning grooves, the second holding portion also has a second outer arc chamfered surface opposite to the first outer arc chamfered surface, and the second outer arc chamfered surface is set to act as the first outer arc chamfered surface. When the two holding parts are pulled away from the guide hole and contact the corresponding arc chamfered surface, the second outer arc chamfered surface will slide on the corresponding arc chamfered surface and be guided by the corresponding arc chamfered surface. direction.

The present invention has at least the following effects: The screw can have a good anti-theft effect due to the design of the first holding parts of the screw head. In addition, the screw must be used with the screwdriver to be tightened or loosened. Therefore, it can be used in special occasions to meet special use requirements.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers.

Referring to FIG. 1, an embodiment of the combination of a screw and a screwdriver of the present invention includes a screw 1 and a screwdriver 2.

Referring to FIGS. 2, 3 and 4, the screw 1 includes a stud 11 and a screw head 12. The screw head 12 is disposed at one end of the stud 11 and defines a first axis A1 together with the stud 11. The screw head 12 includes a connecting wall 13, a surrounding wall 14, and a pushing protrusion 15. The connecting wall 13 is connected to the stud 11 and has a blocking surface 131 opposite to the end of the stud 11. The surrounding wall 14 protrudes from the blocking surface 131 of the connecting wall 13 in a direction away from the stud 11 and surrounds the first axis A1. The surrounding wall 14 has a circular end surface 140 opposite to the end of the stud 11, an inner peripheral surface 141 connected between the end surface 140 and the stopping surface 131, and an inner peripheral surface 141 connected to the end surface. An outer peripheral surface 142 between 140 and the blocking surface 131 and opposite to the inner peripheral surface 141, and a plurality of first holding portions 143 facing the blocking surface 131. The surrounding wall 14 is formed with a guide hole 144 that is recessed from the end surface 140 toward the stud 11 to the stop surface 131 and extends along the first axis A1. The guide hole 144 is defined by the inner peripheral surface 141. Defined. The first holding portions 143 are located around the guide hole 144 and are arranged around the first axis A1 at equal angular intervals. Each of the first holding portions 143 and the end surface 140 are separated by a distance D along the first axis A1, and each of the first holding portions 143 extends along a radial direction R1, R1' perpendicular to the first axis A1 .

In this embodiment, each of the first holding portions 143 has a groove 145 extending from the outer periphery of the guiding hole 144 along the radial direction R1, R1' of the head and communicating with the guiding hole 144, and Two holding surfaces 146 located on opposite sides of the slot 145 respectively. Specifically, the number of the first holding parts 143 in this embodiment is four as an example, but not limited to this. The number of the first holding parts 143 can also be designed to be two, three, or depending on requirements. More than four. The grooves 145 of the two opposite first holding portions 143 extend along the head radial direction R1, and the holding surfaces 146 of each of the aforementioned first holding portions 143 extend along the other side perpendicular to the head radial direction R1. One of the head radial directions R1' is spaced apart and parallel to each other. The grooves 145 of the other two opposite first holding portions 143 extend along the head radial direction R1', and the holding surfaces 146 of each of the first holding portions 143 described above are perpendicular to the head radial direction R1' The other of the heads are spaced apart in the radial direction R1 and parallel to each other.

It should be noted that, in this embodiment, each slot 145 extends to the outer peripheral surface 142 as an example, so that the slot 145 penetrates the surrounding wall 14. Therefore, the screw 1 is used where the screw head 12 can be countersunk. That is to say, after the screw 1 passes through a perforation (not shown) of a fastener to be locked, the perforation can accommodate the screw head 12, so that the fastener to be locked can cover the screw head 12 The slot 145 allows only the end surface 140 and the guide hole 144 to be exposed. In another implementation aspect of this embodiment, each of the grooves 145 may not extend to the outer peripheral surface 142 so that the grooves 145 will not penetrate the surrounding wall 14. At this time, the screw 1 can not only be used in the aforementioned situations where the screw head 12 can be countersunk, but also can be used in situations where the screw head 12 can completely expose the surface of the fastener to be locked without a countersunk head.

In this embodiment, the guide hole 144 has a plurality of alignment groove portions 147 that surround the first axis A1 at equal angular intervals, and the alignment groove portions 147 are respectively aligned with the first holding portions 143 and They are connected to the card slots 145 respectively. The end surface 140 has a plurality of inner end edges 148 respectively located on the outer periphery of the positioning groove portions 147. The surrounding wall 14 also has a plurality of arc-shaped chamfered surfaces 149 that surround the first axis A1 at equal angular intervals. Each of the arc-shaped chamfered surfaces 149 is located between the corresponding first holding portion 143 and the corresponding aligning groove portion 148, and each of the arc-shaped chamfered surfaces 149 is connected to the inner peripheral surface 141 and the corresponding Between the holding surfaces 146 of the first holding portion 143.

The pushing protrusion 15 protrudes from the blocking surface 131 along the first axis A1 and is located in the guide hole 144. The pushing protrusion 15 is a cylinder and has a hemispherical surface 151 at an end opposite to the blocking surface 131, and an outer peripheral surface 152 connected between the blocking surface 131 and the hemispherical surface 151. The length of the pushing protrusion 15 extending along the first axis A1 is less than the length of each of the first holding portions 143 extending along the first axis A1.

Referring to FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the screwdriver 2 is used for inserting into the screw 1 and includes a handle 3, a plurality of holding arms 4, and an elastic ring 5. The grip 3 includes a shell 31 and a limiting bead 32 arranged in the shell 31. The housing 31 extends along a second axis A2 for the user to hold. The housing 31 has two half-shells 310 arranged in opposite directions and attached to each other, and the half-shells 310 are locked together by a screw locking method. The half-shells 310 of the shell 31 jointly define a head end 311, a tail end 312 (as shown in FIG. 1) opposite to the head end 311, and a container recessed from the head end 311 toward the tail end 312. A space 313, a plurality of pivoting portions 314 that surround the second axis A2 at equal angular intervals and are located outside the accommodating space 313, and a connecting portion 314 connected to the accommodating space 313 and located at the head end 311 and the accommodating space 313. The annular groove 315 between the pivotal portions 314. The annular groove 315 is used for receiving a part of the elastic ring 5.

In this embodiment, each of the pivotal portions 314 has a shell radial direction R2, R2' extending from the outer periphery of the accommodating space 313 and perpendicular to the second axis A2, and is connected to the accommodating space 313. A connected pivot groove 316 and two pressing surfaces 317 located on opposite sides of the pivot groove 316 respectively. Specifically, the number of the pivoting portions 314 in this embodiment is four as an example, but it is not limited thereto. The pivot grooves 316 of the two opposing pivot portions 314 extend along the radial direction R2 of the shell, and the pressing surfaces 317 of each of the pivot portions 314 described above extend along the other side perpendicular to the radial direction R2 of the shell. One of the shells is spaced apart in radial direction R2' and parallel to each other. The pivoting grooves 316 of the other two opposite pivoting portions 314 extend along the shell radial direction R2', and the pressing surfaces 317 of each of the aforementioned pivoting portions 314 extend perpendicular to the shell radial direction R2' The other shells are spaced apart in radial direction R2 and parallel to each other.

Referring to FIG. 3, FIG. 5, FIG. 6 and FIG. 7, the holding arms 4 are arranged on the grip rod 3 and surround the second axis A2 at equal angular intervals and are arranged in a ring shape. The number of the holding arms 4 in this embodiment is four as an example, but it is not limited thereto. Each holding arm 4 includes a connecting arm body 41 movably connected to the grip bar 3 and partially exposing the grip bar 3, and a connecting arm body 41 protruding outside the connecting arm body 41 and located outside the grip bar 3 for holding Corresponding to the second holding portion 42 of the first holding portion 143.

The connecting arm body 41 has an arm portion 410 and a pivoting plate portion 411. The arm portion 410 extends along the second axis A2 and one part is accommodated in the accommodating space 313, and the other part protrudes from the head end 311 to be inserted into the guide hole 144. The arm portion 410 has a fan-shaped cross-sectional shape taken along a direction perpendicular to the second axis A2. The arm portion 410 has a head end 412 located outside the housing 31 and a tail end 413 opposite to the head end 412. And an arc-shaped outer surface 414 connected between the head end 412 and the tail end 413. The arm portion 410 is recessed on the inner side of the outer surface 414 to form a receiving groove 415 adjacent to the head end 412, and the receiving groove 415 is used for receiving a part of the pushing protrusion 15. The arm portion 410 has a concave arc surface 416 adjacent to the tail end 413 and a shape matching the shape of the limiting bead 32. The concave arc surface 416 abuts against the outer surface of the limiting bead 32 through surface contact and can Rotate on the outer surface of the limiting bead 32. The outer surface 414 of the arm portion 410 is recessed to form a groove 417 adjacent to the recessed arc surface 416 for receiving a part of the elastic ring 5.

The arm portion 410 also has an inner arc chamfered surface 418 located inside the outer surface 414 and connected to the head end 412, and two abutting edges 419 respectively connected to opposite sides of the inner arc chamfered surface 418 . The inner arc chamfered surface 418 is used for contacting the hemispherical surface 151 of the pushing protrusion 15 and for pushing the hemispherical surface 151. The abutting edges 419 are respectively located on opposite sides of the accommodating groove 415, and each of the abutting edges 419 can abut against the outer peripheral surface 152 of the pushing boss 15 through a line contact method and slide on the outer peripheral surface 152 .

The pivotal plate portion 411 protrudes outward from the outer surface 414 along an arm radial direction R3, R3' perpendicular to the second axis A2 and is adjacent to the tail end 413. The shape of the pivoting plate portion 411 matches the shape of the corresponding pivoting groove 316 and is pivotally connected in the corresponding pivoting groove 316 rotatably. The pivoting plate portion 411 has two pressure receiving surfaces 420 facing the corresponding pressure surfaces 317 respectively. The pivotal plate portions 411 of the two opposite holding arms 4 protrude along the arm radial direction R3, and the pressure surfaces 420 of each of the pivotal plate portions 411 described above are perpendicular to the arm radial direction R3. The other of the arms are spaced apart in radial directions R3' and parallel to each other. The pivotal plate portions 411 of the other two opposite holding arms 4 protrude along the arm radial direction R3', and the pressure-receiving surfaces 420 of each of the pivotal plate portions 411 described above extend along the radial direction perpendicular to the arm radial direction. The other arm of R3' is spaced apart in the radial direction R3 and parallel to each other. Each pressing surface 317 of the grip 3 is used to press the corresponding pressing surface 420 to drive the corresponding holding arm 4 to rotate around the second axis A2.

3, 5 and 7, the second holding portion 42 is a block protruding outward from the outer surface 414 of the arm portion 410 along the radial direction R3, R3' of the arm, the second holding portion 42 is adjacent to the head end 412 and is located outside the accommodating groove 415, the inner arc-shaped chamfered surface 418, and the abutting edges 419, and is used to lock the groove 145 of the corresponding first holding portion 143 Inside. The second holding portion 42 has two force application surfaces 421 for abutting against the corresponding holding surfaces 146 respectively. The second holding portions 42 of the two opposite holding arms 4 protrude along the arm radial direction R3, and the forcing surfaces 421 of each of the aforementioned second holding portions 42 extend perpendicular to the arm radial direction R3. The other of the arms are spaced apart in radial directions R3' and parallel to each other. The second holding portions 42 of the other two opposite holding arms 4 protrude along the arm radial direction R3', and the forcing surfaces 421 of each of the aforementioned second holding portions 42 extend along the radial direction perpendicular to the arm radial direction. The other arm of R3' is spaced apart in the radial direction R3 and parallel to each other.

The second holding portion 42 also has a first outer arc chamfered surface 422 connected between the force applying surfaces 421 and adjacent to the head end 412, and a first outer arc chamfered surface 422 connected between the force applying surfaces 421 and The second outer arc chamfered surface 423 is opposite to the first outer arc chamfered surface 422. The first outer arc-shaped chamfered surface 422 is arranged such that when the second holding portion 42 is inserted into the corresponding alignment groove portion 147 of the guide hole 144 and contacts the corresponding inner end edge 148, the first outer The arc-shaped chamfered surface 422 slides on the corresponding inner end edge 148 to be guided by the insertion direction. The second outer arc-shaped chamfered surface 423 is configured such that when the second holding portion 42 is drawn away from the guide hole 144 and contacts the corresponding arc-shaped chamfered surface 149, the second outer arc-shaped chamfered surface 423 It will slide on the corresponding arc-shaped chamfered surface 149 and be guided by it in the correct pull-out direction.

Referring to FIGS. 3, 6 and 7, the pivoting plate portions 411 of the holding arms 4 are pivotally connected in the pivoting grooves 316 of the housing 31, so that each of the holding arms 4 can be opposed to each other. The housing 31 rotates. The pivotal grooves 316 can respectively limit the pivotal plate portions 411 to prevent the holding arms 4 from rotating about the second axis A2. The concave arc surfaces 416 of the arm portions 410 of the holding arms 4 abut on the outer surface of the limiting bead 32, so that the arm portions 410 can clamp the limiting bead 32. The position of the arm portion 410 adjacent to the tail ends 413 is stretched outward through the limiting bead 32 and the position of the arm portion 410 adjacent to the tail ends 413 is prevented from each other. The contact is maintained at a proper distance, and the pivotal plate portion 411 of each holding arm 4 can be firmly positioned in the corresponding pivotal groove 316. In this way, each of the holding arms 4 can rotate around the limiting bead 32 with the limiting bead 32 as the center of rotation.

The aforementioned manner in which the housing 31 and the limiting bead 32 are pivotally connected to the holding arms 4 enables the single member of the limiting bead 32 to serve as the rotation center of the holding arms 4. As a result, the number of pivotal members required to pivotally connect the holding arms 4 to the housing 31 can be greatly reduced, thereby reducing the structure and assembly complexity of the screwdriver 2 and reducing the screwdriver 2 The manufacturing cost.

By the connecting arm body 41 of each of the holding arms 4 rotatably and pivotally connected between the housing 31 and the limiting bead 32 and being able to rotate around the limiting bead 32, the holding arms 4 can be operated And it changes between a closed state (as shown in Figures 3 and 7) and an expanded state (as shown in Figures 10 and 11). When the holding arms 4 are in the closed state, the second holding parts 42 of the holding arms 4 are close to each other, and the parts of the arm parts 410 adjacent to the head ends 412 abut against each other, so that the The second holding portion 42 can be inserted into the guiding hole 144. When the holding arms 4 are in the expanded state, the second holding parts 42 of the holding arms 4 are far away from each other, and the parts of the arm parts 410 adjacent to the head ends 412 are separated from each other, so that the second holding parts 412 are separated from each other. The holding parts 42 can be respectively clamped in the card slots 145 to hold the first holding parts 143 respectively.

It should be noted that, in this embodiment, the number of the holding arms 4 is designed according to the number of the first holding parts 143 of the screw 1. When the number of the first holding parts 143 is designed to be two, three, or more than four, the number of the holding arms 4 will be correspondingly designed to be two, three or three according to the number of the first holding parts 143. One or more than four.

The elastic ring 5 is sleeved on the arm portions 410 of the holding arms 4 and is accommodated in the grooves 417 and the annular groove 315 for applying elastic constricting force to the holding arms 4 to make The holding arms 4 are constantly maintained in the closed state. The elastic ring 5 of this embodiment is made of a material with elasticity such as silicone or rubber. By accommodating the elastic ring 5 in the grooves 417 and the annular groove 315, the elastic ring 5 can be prevented from sliding on the arms 410 along the second axis A2, and the elastic ring 5 can be prevented The grip 3 is exposed and can be easily disassembled. Of course, in other implementations of this embodiment, the elastic ring 5 can also be sleeved on the arm portions 410 and adjacent to the second holding portions 42, and is not limited to the manner disclosed in this embodiment. .

3, 8 and 9, when the screwdriver 2 is to be inserted into the screw 1, first, the second holding portions 42 of the holding arms 4 are aligned with the guide holes 144, respectively. Equal alignment slot 147. Subsequently, the screwdriver 2 is moved toward the screw head 12 along an insertion direction D1, so that the second holding portions 42 are inserted into the positioning groove portions 147, respectively. When the screwdriver 2 moves along the insertion direction D1, there is a position deviation in the head radial direction R1, R1' (as shown in FIG. 4), resulting in the first outer portion of one of the second holding portions 42 When the arc-shaped chamfered surface 422 contacts the corresponding inner end edge 148, the component force exerted by the inner end edge 148 on the first outer arc-shaped chamfered surface 422 will cause it to face the corresponding inner end edge 148 The aligning groove portion 147 slides, so as to correct the insertion direction of the second holding portion 42 so that the second axis A2 is coaxial with the first axis A1. Thereby, the position deviation of the screwdriver 2 during the insertion process can be absorbed, so as to ensure that the screwdriver 2 can still insert the second holding parts 42 into the alignment groove parts 147 under the condition of position deviation. Inside.

With the design of the alignment grooves 147 of the guide hole 144, the user can know the position of the first holding portion 143 and the position of the screwdriver 2 by looking at the alignment grooves 147. The insertion positions of the second holding parts 42 during insertion. In this way, the convenience of the user in the plug-in operation can be improved.

Referring to Figures 9, 10 and 11, when the holding arms 4 move to the position where the inner arc chamfered surfaces 418 contact the hemispherical surface 151 of the pushing boss 15, the inner arcs are inverted The corner surface 418 will be blocked by the hemispherical surface 151. The component force exerted by the hemispherical surface 151 on the inner arc-shaped chamfered surfaces 418 will simultaneously push the inner arc-shaped chamfered surfaces 418 so that the arm portions 410 are adjacent to the head ends 412 The position of φ is expanded outward and encourages the holding arms 4 to rotate around the limiting bead 32 in a first rotation direction T1 respectively. The pushing protrusion 15 simultaneously pushes the inner arc-shaped chamfered surfaces 418 by the hemispherical surface 151, which can reduce the complexity of the structure of the pushing protrusion 15 and increase the complexity of the inner arc-shaped inverted surface. The contact area between the corner surfaces 418 enables the pushing boss 15 to smoothly push the inner arc chamfered surfaces 418, so that the holding arms 4 can smoothly rotate around the limiting bead 32.

During the rotation of the holding arms 4, the second holding parts 42 are driven through the arm parts 410 to penetrate into the card slots 145 of the first holding parts 143, and through the arms The portion 410 stretches the elastic ring 5 outward to deform it and accumulate the return elastic force.

When the holding arms 4 move to a position where the inner arc-shaped chamfered surface 418 is separated from the hemispherical surface 151, the holding arms 4 will no longer rotate. At this time, the second holding portions 42 are respectively latched in the card slots 145, and the force application surfaces 421 of each second holding portion 42 abut the corresponding holding surfaces 146, respectively. Subsequently, the abutting edges 419 of each of the holding arms 4 abut against the outer peripheral surface 152 of the pushing boss 15 in a line contact manner and slide thereon, thereby, the holding arms 4 can be lowered. The friction between the arm portions 410 and the pushing protrusion 15 enables the holding arms 4 to move smoothly relative to the pushing protrusion 15.

When the head ends 412 of the holding arms 4 and the second holding portions 42 abut against the stopping surface 131 of the connecting wall 13 and are blocked by the stopping surface 131, the screwdriver 2 can no longer Moving along the insertion direction D1, the pushing protrusion 15 penetrates and is accommodated in the accommodating grooves 415 of the arm portions 410. The arm portions 410 are supported by the pushing protrusion 15 so that the holding arms 4 can be stably maintained in the expanded state, so that each of the second holding portions 42 can be firmly positioned in a latch corresponding to the The position of the latch in the card slot 145 (as shown in FIG. 11). At this time, the operation of inserting the screwdriver 2 into the screw 1 and holding the screw 1 is completed.

Referring to Figure 6, Figure 7 and Figure 11, after the screwdriver 2 is inserted and held on the screw 1, the screwdriver 2 can be rotated in a first rotation direction S1 to drive the screw 1 to rotate for tightening The screwdriver 2 can be rotated in a second rotation direction S2 opposite to the first rotation direction S1 to drive the screw 1 to rotate to perform the operation of loosening. Because the pressure surfaces 420 of each holding arm 4 are spaced apart and parallel to each other along the arm radial direction R3, R3', and the pressure surfaces 317 of each pivot portion 314 of the housing 31 are along the The shell radial directions R2 and R2' are spaced apart and parallel to each other. Therefore, a force exerted by each pressing surface 317 on the corresponding pressing surface 420 is perpendicular to the corresponding arm portion 410 of the connecting arm body 41 A moment arm formed by the pivotal plate portion 411 and the limit bead 32 makes the force multiplied by the moment arm to generate a large moment value and can smoothly drive the corresponding holding arm 4 Rotate around the center of the limiting bead 32. In this way, the user can smoothly drive the screwdriver 2 to rotate around the second axis A2 after applying force to the housing 31.

4, 7 and 11, in addition, because the holding surfaces 146 of the first holding portion 143 of the screw head 12 are spaced apart and parallel to each other along the head radial direction R1, R1', and each The force applying surfaces 421 of the second holding portion 42 of the holding arm 4 are spaced apart and parallel to each other along the arm radial direction R3, R3'. Therefore, each force applying surface 421 is applied to the corresponding holding surface 146 A force of is perpendicular to the corresponding holding surface 146 and the first axis A1, so that a moment generated after the force is applied to the screw head 12 can smoothly drive the screw 1 to rotate around the first axis A1. Thereby, the screwdriver 2 can smoothly drive the screw 1 to rotate along the first rotation direction S1 or the second rotation direction S2.

3 and 9, when the screwdriver 2 is to be removed from the screw 1, the screwdriver 2 is pulled along a withdrawal direction D2 that is opposite to the insertion direction D1, so that the holding arms 4 The second holding portion 42 is away from the blocking surface 131, and the abutting edges 419 of each holding arm 4 slide on the outer peripheral surface 152. When the abutting edges 419 move away from the outer peripheral surface 152 and the inner arc-shaped chamfered surface 418 corresponds to the position of the hemispherical surface 151, the reset elastic force accumulated by the elastic ring 5 will drive the holding arms 4 to move along a The second rotation direction T2, which is opposite to the first rotation direction T1 (as shown in FIG. 10), rotates around the stop bead 32, so that the parts of the arms 410 adjacent to the head ends 412 shrink and approach, and the inner The arc-shaped chamfered surface 418 abuts on the hemispherical surface 151.

The holding arms 4 will continue to rotate in the second rotation direction T2 along with the movement of the screwdriver 2, so that the arms 410 drive the second holding parts 42 to gradually move away from the cards.槽145. When the screwdriver 2 moves to the position shown in FIG. 9, the holding arms 4 return to the closed state. After the screwdriver 2 continues to move along the pulling-out direction D2, the second holding portions 42 of the holding arms 4 can be moved away from the screw head 12 via the positioning groove portions 147, respectively.

When the screwdriver 2 moves along the pulling-off direction D2, there is a position deviation in the head radial direction R1, R1' (as shown in FIG. 4), resulting in the second outer portion of one of the second holding portions 42 When the arc-shaped chamfering surface 423 contacts the corresponding arc-shaped chamfering surface 149, the component force exerted by the arc-shaped chamfering surface 149 on the second outer arc-shaped chamfering surface 423 will cause it to be in the arc-shaped chamfering surface. The corner surface 149 slides toward the corresponding aligning groove portion 147, so as to correct the withdrawal direction of the second holding portion 42 so that the second axis A2 is coaxial with the first axis A1. Thereby, the position deviation of the screwdriver 2 during the pulling-out process can be absorbed, so as to ensure that the screwdriver 2 can still penetrate the second holding parts 42 into the alignment grooves under the condition of position deviation. In 147, the screw head 12 is moved away from the screw head 12 via the positioning grooves 147.

3, 10 and 11, because the first holding portions 143 of the screw head 12 surround the first axis A1 and are located outside the guide hole 144, and each of the first holding portions 143 and the The end surface 140 is spaced apart by the distance D along the first axis A1 and extends along the head radial direction R1, R1'. Therefore, the holding arms 4 of the screwdriver 2 need to penetrate the guide hole first in the closed state After 144, the holding arms 4 are pushed from the closed state to the expanded state by, for example, the pushing protrusion 15 of the screw 1, so that the second holding parts 42 of the holding arms 4 can be held respectively The first holding parts 143 are used for tightening or loosening the screw 1. Therefore, a person who is willing to insert the guide hole 144 of the screw 1 through a screwdriver or tool currently on the market cannot directly interfere with the first holding portion 143, so that the screwdriver or tool cannot rotate the screw. 1. In addition, since the end surface 140 of the screw head 12 has a circular ring shape and is separated from the first holding portions 143 by the distance D along the first axis A1, the end surface 140 can block the screwdriver or tool To prevent it from interfering with the first holding portions 143. Furthermore, the pushing boss 15 of the screw 1 will block the screwdriver or tool on the first axis A1, thereby limiting the depth of insertion of the screwdriver or tool to prevent the screwdriver or the tool from being inserted. The tool attempts to interfere with the first holding portion 143 through the rotation angle. In this way, the screw 1 can have a good anti-theft effect.

On the other hand, by integrally forming the pushing protrusion 15 on the blocking surface 131, a pushing structure for pushing the holding arms 4 from the closed state to the unfolded state is The design is relatively simple, which can reduce design complexity and manufacturing cost. Since the screw 1 of this embodiment must be used with the screwdriver 2 of this embodiment to perform tightening or unscrewing operations, the anti-theft effect can be improved and it can be applied to special occasions.

It should be noted that the screw 1 and the screwdriver 2 of this embodiment can also have the following different changes according to requirements:

One of the variations is that each of the first holding portions 143 can be a block formed inside the surrounding wall 14, and each of the second holding portions 42 can form a slot for the block to be detented.

Another variation is that the connecting arm body 41 of each of the holding arms 4 can be connected to the grip rod 3 through a sliding connection.

Another variation is that the screw 1 omits the pushing boss 15 and the screwdriver 2 pushes the holding arms 4 through a pushing rod that can extend and retract between the holding arms 4 , So that the holding arms 4 can be changed between the closed state and the expanded state.

Another variation is that the screw 1 omits the pushing boss 15, and the screwdriver 2 drives each of the holding arms 4 to rotate through an electric control motor, so that the holding arms 4 can be in the closed state and Change between the expanded states.

In summary, the screw 1 of this embodiment is designed with the first holding parts 143 of the screw head 12, so that the screw 1 can have a good anti-theft effect. In addition, the screw 1 must be used with the screwdriver 2 to perform the tightening or loosening operation. Therefore, it can be used in special applications to meet the special needs of use, and it can indeed achieve the purpose of costing and novelty.

However, the above are only examples of the present model. When the scope of implementation of the present model cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present model and the contents of the patent specification shall still belong to This new patent covers the scope.

1: screw 11: Stud 12: Screw head 13: connecting wall 131: stop surface 14: Surround the wall 140: end face 141: inner peripheral surface 142: Outer peripheral surface 143: The first holding part 144: Guiding Hole 145: card slot 146: Holding Surface 147: Alignment slot 148: Inner Edge 149: Curved chamfered surface 15: Pushing the convex column 151: Hemisphere 152: Outer peripheral surface 2: screwdriver 3: Grip 31: Shell 310: Half shell 311: Headend 312: End 313: accommodating space 314: Pivot 315: Ring groove 316: pivot slot 317: Pressure Surface 32: Limiting beads 4: Holding arm 41: connecting arm body 410: Arm 411: Pivot Plate 412: head end 413: end 414: Outer Surface 415: Containment Slot 416: sunken arc 417: groove 418: Inner arc chamfered surface 419: Abutting Side 420: pressure surface 42: The second holding part 421: Force Face 422: The first outer arc chamfered surface 423: The second outer arc chamfered surface 5: Elastic ring A1: The first axis A2: second axis D: distance D1: Insertion direction D2: Withdrawal direction R1, R1’: head radial R2, R2’: Shell radial R3, R3’: Arm radial T1: first rotation direction T2: second rotation direction S1: The first rotating party S2: Second rotation direction

The other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, among which: Figure 1 is a perspective exploded view of an embodiment of the combination of a screw and a screwdriver of the present invention, illustrating the assembly relationship between a screw and a screwdriver; Figure 2 is an incomplete three-dimensional exploded view of the embodiment; Figure 3 is an incomplete cross-sectional exploded view of the embodiment; Figure 4 is a rear view of the screw of the embodiment; 5 is an incomplete exploded perspective view of the screwdriver of the embodiment, illustrating the assembly relationship between a grip rod, a plurality of holding arms and an elastic ring; Figure 6 is a cross-sectional view taken along the VI-VI line in Figure 1; Figure 7 is a front view of the screwdriver of the embodiment; Figure 8 is a cross-sectional view of the embodiment, illustrating the holding arms in a closed state; Figure 9 is an incomplete cross-sectional view of the embodiment; Figure 10 is an incomplete cross-sectional view of the embodiment, illustrating the holding arms in an unfolded state; and FIG. 11 is a cross-sectional view of the embodiment, illustrating that the holding arms are in the expanded state, and the plurality of second holding parts respectively hold the plurality of first holding parts.

1: screw

11: Stud

12: Screw head

143: The first holding part

145: card slot

146: Holding Surface

2: screwdriver

3: Grip

310: Half shell

311: Headend

312: End

4: Holding arm

42: The second holding part

Claims (32)

A type of screw that contains: A stud; and A screw head is arranged at one end of the stud and defines an axis together with the stud. The screw head includes an end surface opposite to the one end of the stud, and a plurality of holding parts. The screw head is formed with a The end surface is recessed in the direction of the stud and extends along the axis of the guide hole, the holding portions are located around the guide hole and spaced around the axis, each of the holding portion and the end surface are opposite to the end surface along the axis With a distance, each of the holding parts extends in a radial direction perpendicular to the axis. The screw according to claim 1, wherein each of the holding portions has a groove extending from the outer periphery of the guiding hole along the radial direction of the head and communicating with the guiding hole. The screw according to claim 2, wherein each of the holding portions further has two holding surfaces respectively located on opposite sides of the slot, and the holding surfaces are spaced apart along the other head radial direction perpendicular to the head radial direction And parallel to each other. The screw according to claim 1, wherein each of the holding portions has two holding surfaces, and the holding surfaces are spaced apart and parallel to each other along the other head radial direction perpendicular to the head radial direction. The screw according to any one of claims 1 to 4, wherein the screw head further includes a blocking surface between the stud and the holding parts and facing the holding parts, and a protruding surface The blocking surface is located in the pushing boss in the guide hole. The screw according to claim 5, wherein the pushing protrusion has a hemispherical surface and an outer peripheral surface connected between the blocking surface and the hemispherical surface. The screw according to any one of claims 1 to 4, wherein the end surface has a circular ring shape. The screw according to any one of claims 1 to 4, wherein the guide hole has a plurality of alignment grooves that surround the axis at angular intervals and are aligned with the holding portions. The screw according to claim 8, wherein the screw head further includes a plurality of arc-shaped chamfered surfaces surrounding the axis at angular intervals, and each of the arc-shaped chamfered surfaces is located at the corresponding holding portion and the corresponding holding portion. Between the alignment slots. A screwdriver containing: A grip, extending along an axis; and A plurality of holding arms are arranged on the grip rod and surround the axis at angular intervals and arranged in a ring shape, each of the holding arms includes a connecting arm body movably connected to the grip rod and partially exposed outside the grip rod , And a holding part protruding outside the connecting arm body and located outside the grip, the holding arms can be operated to change between a closed state and an unfolded state, when the holding arms are in the closed state At this time, the holding parts of the holding arms are close to each other, and when the holding arms are in the expanded state, the holding parts of the holding arms are far away from each other. The screwdriver according to claim 10, wherein the connecting arm body has an outer surface and a head end located outside the grip, and the holding portion is a card protruding from the outer surface and adjacent to the head end piece. The screwdriver according to claim 11, wherein the outer surface is arc-shaped, the holding portion protrudes outward from the outer surface along an arm radially, and the holding portion has two force application surfaces, the force application The faces are spaced apart in the radial direction of the other arm perpendicular to the radial direction of the arm and are parallel to each other. The screwdriver according to claim 11, wherein the holding portion further has a first outer arc-shaped chamfered surface opposite to the end of the grip rod, and a first outer arc-shaped chamfered surface opposite to the first outer arc-shaped chamfered surface The second outer arc chamfered surface. The screwdriver according to claim 10, wherein the connecting arm body has an inner arc-shaped chamfered surface located inside the holding portion. The screwdriver according to claim 14, wherein the connecting arm body is formed with an accommodating groove located inside the holding portion, and the connecting arm body further has two abutting edges respectively located on opposite sides of the accommodating groove. The screwdriver according to any one of claims 10 to 15, wherein the connecting arm of each of the holding arms is pivotally connected to the grip rod rotatably, and the screwdriver further includes a set on the holding arms These connecting arm bodies are elastic rings that apply elastic contraction force to them. The screwdriver according to claim 16, wherein the grip includes a housing and a limiting bead arranged in the housing, and the connecting arm body of each holding arm is pivotally connected to the housing and the housing Between the limit beads and can rotate around the limit beads. The screwdriver according to claim 17, wherein the housing is formed with an accommodating space, and a plurality of pivoting portions surrounding the axis at intervals and located outside the accommodating space, each of the pivoting portions has A pivoting groove extending radially outward along a shell and communicating with the accommodating space, the connecting arm body has an arm portion that is partially accommodated in the accommodating space, and a pivoting plate portion, The arm portion has a tail end located in the accommodating space, and a concave arc surface adjacent to the tail end and abutting on the limiting bead, and the arm portions of the holding arms are adjacent to the tail ends Supported by the limiting bead outward to maintain a proper spacing, the pivotal plate portion protrudes radially outward along an arm from the side of the arm opposite to the concave arc surface, and is adjacent to the tail end and can rotate. It is pivotally connected to the corresponding pivot groove. The screwdriver according to claim 18, wherein each of the pivoting portions further has two pressing surfaces located on opposite sides of the pivoting groove, and the pressing surfaces are along the other one perpendicular to the radial direction of the shell. The shells are radially spaced apart and parallel to each other. The pivotal plate portion has two pressure surfaces facing the corresponding pressure surfaces, and the pressure surfaces are opposite to each other in the radial direction of the other arm perpendicular to the radial direction of the arm. Spaced and parallel to each other. A combination of screw and screwdriver, including: One screw, including: A stud A screw head is arranged at one end of the stud and defines a first axis together with the stud. The screw head includes an end surface opposite to one end of the stud, and a plurality of first holding parts. The head is formed with a guide hole that is recessed from the end surface toward the stud and extends along the first axis. The first holding portions are located around the guide hole and are arranged at intervals around the first axis. The first holding portion and the end surface are separated by a distance along the first axis, and each of the first holding portions extends in a radial direction perpendicular to the first axis; A screwdriver for plugging into the screw and containing: A grip rod extending along a second axis; and A plurality of holding arms are arranged on the grip rod and surround the second axis at angular intervals and are arranged in a ring shape, each of the holding arms includes a connection that is movably connected to the grip rod and partially exposed outside the grip rod The arm body, and a second holding portion protruding outside the connecting arm body and located outside the grip, the connecting arm body is used for inserting into the guide hole, and the second holding portion is used for holding the corresponding The first holding part, the holding arms can be operated to change between a closed state and an expanded state, when the holding arms are in the closed state, the second holding parts of the holding arms are mutually Close so that the second holding parts can be inserted into the guide hole. When the holding arms are in the unfolded state, the second holding parts of the holding arms are far away from each other, so that the second holding parts The parts can be respectively held on the first holding parts. The combination of a screw and a screwdriver according to claim 20, wherein each of the first holding portions has a groove extending from the outer periphery of the guiding hole along the radial direction of the head and communicating with the guiding hole , The connecting arm body has an outer surface, and a head end located outside the grip, and the second holding portion is a protruding portion protruding from the outer surface and adjacent to the head end to be latched to the corresponding first The card block of the card slot of the holding part. The combination of a screw and a screwdriver according to claim 21, wherein each of the first holding portions further has two holding surfaces located on opposite sides of the slot, and the holding surfaces extend along a radial direction perpendicular to the head. The other heads are radially spaced apart and parallel to each other, the outer surface is arc-shaped, the second holding portion protrudes outward from the outer surface along an arm radially, and the second holding portion has two abutting portions. On the force application surfaces of the holding surfaces, the force application surfaces are spaced apart and parallel to each other along another arm radial direction perpendicular to the arm radial direction. The combination of a screw and a screwdriver according to any one of claims 20 to 22, wherein the screw head further includes a screw between the stud and the first holding parts and facing the first holding parts A stopping surface, and a pushing protrusion protruding on the stopping surface and located in the guide hole, the stopping surface is used to stop the holding arms, and the pushing protrusion is used to push the The holding arms are used to transform the holding arms from the closed state to the expanded state. The screw and screwdriver combination of claim 23, wherein the pushing protrusion has a hemispherical surface, and the connecting arm body has an inner arc located inside the second holding portion for pushing the hemispherical surface Chamfered surface. The screw and screwdriver combination of claim 24, wherein the connecting arm body is formed with a receiving groove located inside the second holding portion for receiving a part of the pushing protrusion, and the pushing protrusion The column also has an outer peripheral surface connected between the stopping surface and the hemispherical surface, and the connecting arm body also has two abutting edges respectively located on opposite sides of the accommodating groove, and each of the abutting edges can penetrate the wire The contact method abuts on the outer peripheral surface and slides on the outer peripheral surface. The screw and screwdriver combination of any one of claims 20 to 22, wherein the screw head further includes a pushing boss located in the guide hole, and the pushing boss is used to push the Waiting for the holding arms to transform the holding arms from the closed state to the unfolded state, the connecting arm body of each holding arm is pivotally connected to the grip rod, and the screwdriver further includes a set set on the holding arms The arm bodies of the arm are connected to the elastic rings for applying elastic constriction force to them. The combination of a screw and a screwdriver according to claim 26, wherein the grip includes a housing and a limit bead arranged in the housing, and the connecting arm body of each holding arm is pivotally connected to The shell and the limiting bead can rotate around the limiting bead. The screw and screwdriver combination according to claim 27, wherein the housing forms an accommodating space, and a plurality of pivoting parts that surround the second axis at intervals and are located outside the accommodating space, each One of the pivoting portions has a pivoting groove extending radially outward along a shell and communicating with the accommodating space, the connecting arm body has an arm portion that is partially accommodated in the accommodating space, and A pivoting plate portion, the arm portion has a tail end located in the accommodating space, and a concave arc surface adjacent to the tail end and abutting on the limiting bead, the arm portions of the holding arms The parts adjacent to the tail ends are stretched outward by the limiting bead to maintain a proper distance. The pivotal plate portion protrudes radially outward along an arm from the side of the arm portion opposite to the concave arc surface and is adjacent to the The tail end is pivotally connected to the corresponding pivot groove. The screw and screwdriver combination according to claim 28, wherein each of the pivoting portions further has two pressing surfaces located on opposite sides of the pivoting groove, and the pressing surfaces are perpendicular to the shell diameter. The other shells are radially spaced apart and parallel to each other. The pivotal plate portion has two pressure surfaces facing the corresponding pressure surfaces, and the pressure surfaces extend along the other one perpendicular to the radial direction of the arm The arms are radially spaced apart and parallel to each other. The screw and screwdriver combination according to any one of claims 20 to 22, wherein the end surface has a circular ring shape. The screw and screwdriver combination according to any one of claims 20 to 22, wherein the guide hole has a plurality of angularly spaced intervals around the first axis and is aligned with the positions of the first holding parts, respectively The alignment grooves are respectively used for inserting a part of the second holding portions, the end surface has a plurality of inner end edges respectively located outside the alignment grooves, and the second holding portion It also has a first outer arc-shaped chamfered surface, and the first outer arc-shaped chamfered surface is configured to contact the corresponding inner end when the second holding portion is inserted into the corresponding alignment groove portion of the guide hole When edged, the first outer arc-shaped chamfered surface slides on the corresponding inner end edge to be guided by the insertion direction. The screw and screwdriver combination of claim 31, wherein the screw head further includes a plurality of arc-shaped chamfered surfaces that surround the first axis at an angular interval, and each of the arc-shaped chamfered surfaces is located on a corresponding Between the first holding portion and the corresponding aligning groove portion, the second holding portion further has a second outer arc chamfered surface opposite to the first outer arc chamfered surface, and the second outer arc The curved chamfered surface is arranged such that when the second holding portion is drawn away from the guide hole and contacts the corresponding curved chamfered surface, the second outer curved chamfered surface will be aligned with the corresponding curved chamfered surface Slide up and be guided by it to pull out the direction.

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