Screw tightening tool

Abstract

To provide a screw fastening tool capable of holding a screw and a member to be fixed, through which the screw is inserted.SOLUTION: A screw fastening tool 1 comprises a handle 2, and a shank 3, the tip of which is formed with an engagement part 31 engaged with a screw. The screw fastening tool 1 has the shank 3 provided with a support member 4 freely rotatable with respect to the shank 3, and has the support member 4 provided with a holding member 5 capable of elastically holding a member to be fixed, through which the screw engaged with the engagement part 31 is inserted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a screw tightening tool for fastening and unfastening a screw that fastens a member to be fastened. [Background technology]

[0002] When turning or milling a workpiece such as metal, a cutting tool 9 may be used in which a throw-away tip 7, which is a replaceable cutting edge, is attached to a holder 6, as shown in FIG. 3. The throw-away tip 7 is fixed to the holder 6 by a screw 8 and is attached and detached using a tool such as a wrench or a screwdriver. Such throw-away tips 7 are often small in size and may be accidentally dropped and lost when attaching or detaching them from the holder 6. A throw-away tip 7 with multiple cutting edges is originally usable until all the cutting edges wear out, and is relatively expensive, so preventing the loss of throw-away tips 7 helps reduce manufacturing costs.

[0003] Incidentally, as described in Patent Document 1, it is known to provide a member for holding a screw on a tool such as a screwdriver in order to prevent the screw from falling off the tool when it is attached or detached. However, while such a tool can prevent the screw from falling off, it cannot prevent the fixed member, such as a throw-away tip, which is fixed by the screw, from falling off. In addition, Patent Document 2 describes a wrench that uses a magnet to prevent the throw-away tip made of a magnetic material from falling off, but this wrench cannot prevent the fixed member made of a material that is not attracted to a magnet, such as ceramic, from falling off. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-135685 A [Patent Document 2] Japanese Patent Application Publication No. 10-296647 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a screw tightening tool that overcomes the above-mentioned problems of the conventional screw tightening tool and is capable of holding a screw and a member to be fixed through which the screw is inserted. [Means for solving the problem]

[0006] In order to solve the above problems, a screw tightening tool is provided that has a handle and a shaft portion having an engagement portion at the tip that engages with a screw, wherein the shaft portion is provided with a support member that is rotatable relative to the shaft portion, and the support member is provided with a clamping member that is capable of elastically clamping a fixed member through which a screw engaged with the engagement portion is inserted.

[0007] It is also preferable that the clamping member is arranged so that the tip side opens and closes with respect to the shaft portion, and that the tip side opens when a pressing portion provided on the base end side of the clamping member is pressed with a finger.

[0008] It is also preferable that the clamping member has a clamping portion at its tip side for clamping the fixed member, and that the clamping portion has a V-shaped cross section perpendicular to the extension direction of the shaft portion.

[0009] It is also preferable that the clamping member is made of a leaf spring.

[0010] It is also preferable that the clamping member is made of resin and that the tip side is closed by being pressed by a spring. Effect of the Invention

[0011] The present invention can provide a screw tightening tool capable of holding a screw and a member to be fixed with the screw inserted therethrough. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a front view of a screw tightening tool according to a first embodiment. [Diagram 2] FIG. 1 is a side view of a screw tightening tool according to a first embodiment. [Diagram 3] 1 is an exploded view of a cutting tool to which a throw-away tip, which is a fixed member in a first embodiment, is attached. [Figure 4] 1A and 1B are diagrams showing a procedure for attaching a throw-away tip to a holder using the screw tightening tool of the first embodiment, in which (A) shows the state in which the shaft part and the clip body are open, and (B) shows the state in which the throw-away tip with a screw inserted therethrough is clamped between the shaft part and the clamping part of the clip body. [Diagram 5] FIG. 4B is a cross-sectional view taken along line VV of FIG. [Figure 6] FIG. 11 is a perspective view of a screw tightening tool according to a second embodiment. [Figure 7] FIG. 6 is a partial cross-sectional view of a screw tightening tool according to a second embodiment. [Figure 8] FIG. 11 is a perspective view of a screw tightening tool according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The following describes an embodiment of the invention. As shown in FIG. 1 and FIG. 2, a screw tightening tool 1 according to the first embodiment includes a flat handle 2 and a shaft portion 3 extending in the longitudinal direction, and an engagement portion 31 that engages with a screw is formed at the tip of the shaft portion 3. A support member 4 that can rotate freely with respect to the shaft portion 3 is provided at the base end side of the shaft portion 3. The shaft portion 3 includes a stepped portion (not shown) that prevents the support member 4 from moving in the axial direction, and the support member 4 is fixed to the shaft portion 3 so as not to move in the axial direction. In this embodiment, a bearing is used as the support member 4. Note that the support member 4 is not limited to a bearing, and may be something else as long as it can rotate freely with respect to the shaft portion 3. The support member 4 is provided with a clamping member 5 that can elastically clamp a fixed member through which a screw engaged with the engagement portion 31 is inserted.

[0014] The clamping member 5 will be described. As shown in FIG. 2, the clamping member 5 of the first embodiment is formed using one metal leaf spring, and includes a clip body 53 in the shape of a substantially long plate extending along the longitudinal direction of the shaft portion 3, and a connecting portion 54 that is bent in a direction substantially perpendicular to the clip body 53 and connected to the support member 4. In the clamping member 5, the side located on the handle 2 side when connected to the support member 4 provided on the shaft portion 3 is the base end side, and the side located on the engagement portion 31 side is the tip end side. The connecting portion 54 of the first embodiment is formed by cutting out and bending a part of the clip body 53 at a position on the base end side from the center of the clip body 53. The connecting portion 54 of the first embodiment is bonded to the lower side of the support member 4. The connecting portion 54 is not limited to this shape, and may have another shape as long as the clamping member 5 is supported to be swingable relative to the support member 4.

[0015] The clip body 53 of the first embodiment is provided with a pressing portion 51 for pressing the end portion on the base end side with a finger. The pressing portion 51 of the first embodiment is formed at an angle from a position near the connecting portion 54 in a direction away from the shaft portion 3. The clip body 53 also has a clamping portion 52 that can elastically clamp the fixed member on the tip side. The clamping portion 52 of the first embodiment is formed in a wedge shape that gradually narrows as it approaches the tip. Furthermore, the clamping portion 52 is provided with a slit from the tip to the base end side, and is mountain-folded along the slit when viewed from the shaft portion 3 side, so that the cross section perpendicular to the extension direction of the shaft portion 3 and the clamping member 5 is V-shaped. The shape of the clamping portion 52 is not limited to a V-shaped cross section, and may be a flat plate shape without an angle. In this case, the clamping portion 52 may be provided with an anti-slip elastic member. This allows even a fixed member with a shape without corners to be clamped more stably.

[0016] As described above, the connecting portion 54 is formed by cutting out and bending a part of the clip body 53 made of a single leaf spring, so that the clamping portion 52 is biased so as to be pressed against the tip side of the shaft portion 3 by the elastic force of the leaf spring. When the pressing portion 51 is not pressed, the tip side of the clip body 53 elastically abuts against the tip side of the shaft portion 3, and the shaft portion 3 and the clip body 53 are in a closed state. When the operator presses the pressing portion 51 with his / her finger toward the shaft portion 3, the clamping portion 52 moves in a direction away from the shaft portion 3 with the connecting portion 54 as a fulcrum, and the shaft portion 3 and the clip body 53 are in an open state.

[0017] Next, a method of clamping a fixed member through which a screw is inserted, by the shaft portion 3 and the clamping member 5 will be described. As shown in FIG. 3, the fixed member in the first embodiment is a ceramic throw-away tip 7 attached to a holder 6 of a cutting tool 9 with an indexable cutting edge. The throw-away tip 7 in this example is substantially diamond-shaped in plan view, but the shape of the throw-away tip 7 is not limited to this, and may be, for example, triangular in plan view. The material of the throw-away tip 7 is not limited to ceramic, and may be other materials such as metal.

[0018] 3, the throw-away tip 7 has a rake face 71, a clearance face 72, and a cutting edge 73 formed on the ridge where the rake face 71 and the clearance face 72 intersect. Corners 74 are corners of the rake face 71, and the corners 74 on both the upper and lower sides are sequentially arranged in the usage position, and the throw-away tip 7 is discarded after all the cutting edges 73 have been used.

[0019] The throw-away tip 7 in this example is attached to the holder 6 by a screw clamp method. In this method, the throw-away tip 7 is placed on the tip attachment surface 61 at the tip end of the holder 6, the screw hole 61 formed in the tip attachment surface 61 is aligned with the screw hole 75 formed in the rake face 71, and the screw 8 is inserted into the screw hole 75 and tightened to fix the throw-away tip 7 to the holder 6.

[0020] When the throw-away tip 7 described above is attached to the holder 6 using the screw tightening tool 1 of this embodiment, the pressing portion 53 of the clamping member 5 is pressed with a finger as shown in FIG. 4(A), and the shaft portion 3 and the clip body 53 are opened. In this state, the screw 8 is inserted into the screw hole 75 of the throw-away tip 7, and the engagement portion 31 of the screw tightening tool 1 is engaged with the head of the screw 8. When the V-shaped valley of the clamping portion 52 is positioned so as to abut against the corner 74 and the pressure on the pressing portion 53 is released, the throw-away tip 7 is clamped and held by the shaft portion 3, the screw 8, and the clamping portion 52 with a predetermined pressure as shown in FIG. 4(B) and FIG. 5. In this way, the throw-away tip 7 with the screw 8 inserted therethrough can be elastically clamped by the shaft portion 3 and the clamping member 5. At this time, since the clamping member 5 is connected to the support member 4 which is freely rotatable relative to the shaft portion 3, the screw 8 can be tightened by rotating the shaft portion 3 while the throw-away tip 7 is still clamped.

[0021] When removing the throw-away tip 7 from the holder 6, the pressing portion 53 is pressed to open the clamping portion 52 and the engaging portion 31, and the engaging portion 31 is engaged with the head of the screw 8. Thereafter, the pressure on the pressing portion 53 is released to bring the V-shaped valley of the clamping portion 52 into contact with the corner 74, and the throw-away tip 7 is clamped. In this state, when the shaft portion 3 is rotated to loosen the screw 8, the throw-away tip 7 can be removed from the holder 6 while the throw-away tip 7 is still held by the screw tightening tool 1. Therefore, according to the present invention, a screw tightening tool capable of holding a screw and a fixed member through which the screw is inserted is provided, and the dropping of the screw and the fixed member during attachment and detachment can be suppressed.

[0022] Next, a second embodiment will be described. As shown in FIG. 6, in the second embodiment, the screw tightening tool 1 includes a clamping member 5 made of resin. The clamping member 5 of the second embodiment is entirely made of resin, and includes a clip body 53 whose approximate center is bent into an obtuse V-shape in side view, and a connecting portion 54 which is a convex portion formed on the side of the clip body 53. The clip body 53 includes a pressing portion 51 which extends from the bent portion toward the end portion on the base end side in a direction away from the shaft portion 3, and a clamping portion 52 which extends from the bent portion toward the tip end side in approximately parallel to the shaft portion 3. In addition, the connecting portion 54 in this embodiment is provided at a position on the base end side of the bent portion, and the connecting portion 54 is engaged with a bearing hole 424 formed in an arm portion 423 of the support member 4, so that the clamping member 5 is pivotally supported with respect to the arm portion 423 with the connecting portion 54 as a pivot.

[0023] The support member 4 of the second embodiment is composed of a base end support member 41 and a tip end support member 42. The support member 4 is attached to the shaft portion 3 so as to be freely rotatable by inserting the shaft portion 3 through a shaft hole 411 formed in the center of the base end support member 41 and a shaft hole 421 formed in the tip end support member 42. The tip end support member 42 has two arm portions 423 which extend in one direction from a side surface and face each other. A bearing hole 424 is formed in the arm portion 423 to receive the connecting portion 54, and the connecting portion 54 is journaled in the bearing hole 424, so that the clamping member 5 is journaled to the arm portion 423 so as to be swingable about the connecting portion 54 as a journal.

[0024] The tip side support member 42 of the second embodiment can be divided into two parts horizontally at approximately the center of the shaft hole 421. As shown in FIG. 7, a convex part 412 is formed on the bottom of the base side support member 41, and a concave part 422 that engages with the convex part 412 is formed on the inside of the tip side support member 42. The base side support member 41 and the tip side support member 42 are connected by the convex part 412 and the concave part 422 engaging with each other. For this reason, the shaft part 3 is first inserted into the base side support member 41, and then the two divided tip side support members 42 are joined so that the concave part 422 sandwiches the convex part 412, thereby connecting the two members.

[0025] As described above, the clamping member 5 in this embodiment is made of resin and does not have elasticity by itself like a leaf spring. Therefore, for example, by pressing the pressing portion 51 from the shaft portion 3 side with the pressing pin 55 and the spring 56, the clamping portion 52 at the tip is pressed against the engaging portion 31, so that the clamping portion 52 can be made to be in a state in which it is possible to elastically clamp the fixed member.

[0026] In the example shown in FIG. 7, the pressing pin 55 is supported by the base end support member 41. The base end support member 41 of the second embodiment is a substantially cylindrical member, and includes an axial hole 411 through which the shaft portion 3 is inserted, and a support hole 413 through which the pressing pin 55 is inserted in a direction perpendicular to the axial hole 411. The pressing pin 55 of the embodiment includes a cylindrical shaft 551, and the shaft 551 is formed with an elongated hole 552 through which the shaft portion 3 is inserted. After the pressing pin 55 is inserted into the support hole 413 of the base end support member 41, the shaft hole 411 and the elongated hole 552 are aligned, and the shaft portion 3 is inserted into these holes. The pressing pin 55 through which the shaft portion 3 is inserted is slidable in a direction perpendicular to the shaft portion 3 within the range of the longitudinal dimension of the elongated hole 551.

[0027] A spring 56 is provided between the pressing pin 55 and the pressing portion 51, and by pressing the pressing pin 55 towards the pressing portion 51, the clamping portion 52 on the tip side is urged so as to be pressed against the engaging portion 31, making it possible to elastically clamp the member to be fixed. Conversely, by pressing the pressing portion 51 towards the shaft portion 3 with a finger, the shaft portion 3 and the clip body 53 can be opened.

[0028] In addition, the procedure for assembling the support member 4, clamping member 5 and pressing pin 55 of the second embodiment to the shaft portion 3 is as follows: first, with the pressing pin 55 inserted into the base end support member 41, the shaft portion 3 is inserted through the shaft hole 411 and the long hole 552; next, the tip end support member 42, which is in a two-piece state, is fitted so as to sandwich the shaft portion 3 and the convex portion 412 of the base end support member 41, and connected to the base end support member 41.

[0029] As a third embodiment, the screw tightening tool 1 may include a clamping member 5 as shown in FIG. 8. The third embodiment is the same as the screw tightening tool 1 of the second embodiment except for the clamping member 5. The clamping member 5 of the third embodiment is entirely made of resin and includes a clip body 53 extending along the longitudinal direction of the shaft 3 and a connecting portion 54 which is a convex portion formed on the side surface of the clip body 53. The pressing portion 51 provided on the base end side of the clip body 53 is formed so as to be inclined from a position near the connecting portion 54 in a direction away from the shaft 3. The clip body 53 is formed from the connecting portion 54 to the tip end with a portion that is approximately parallel to the shaft 3, a portion that is inclined toward the shaft 3, and a portion that is approximately parallel to the shaft 3, which are connected in series, and the portion at the tip end of the clip body 53 that is approximately parallel to the shaft 3 is the clamping portion 52 that can elastically clamp the member to be fixed.

[0030] In addition, the clamping member 5 in the third embodiment is also made of resin, and the support member 5 alone does not have elasticity. Therefore, similar to the second embodiment shown in FIG. 6, by pressing the pressing portion 51 with the pressing pin 55 and the spring 56, the clamping portion 52 can be pressed against the engagement portion 31, making it possible to clamp the fixed member.

[0031] Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment and can be variously modified. For example, the support member 4 of the first embodiment may be shaped so as to be separable into a base end side and a tip end side, and the clamping member 5 may be attached by sandwiching the connecting portion 54 between these members. In addition, the connecting portion 54 may be a hole through which a support shaft can be inserted, and the bearing hole 424 of the support member 4 may receive the shaft inserted into the connecting portion 54, thereby supporting the clamping member 5 on the support member 4.

[0032] Also, the clamping member 5 may be structured to be pressed against the shaft portion 3 by being biased by a torsion coil spring or the like. The clamping portion 52 may be formed with a bent tip as shown in Fig. 1. In the example shown in Fig. 1, the tip of the clamping portion 52 is bent so as to face in the direction away from the shaft portion 3, but conversely, the tip of the clamping portion 52 may be formed so as to face the shaft portion 3. If the tip of the clamping portion 52 is formed so as to face the shaft portion 3, the fixed member such as the throw-away tip 7 can be held from below, and the falling off of the fixed member can be further suppressed.

[0033] Furthermore, the member to be fastened is not limited to the throw-away tip 7, and the screw fastening tool 1 can be applied to other members to be fastened. Furthermore, although the screw fastening tool 1 in this embodiment is a wrench, it may be a screwdriver. [Explanation of symbols]

[0034] 1 Screw tightening tool 2 Handle 3 Shaft section 31 Engagement part 4 Support member 41 Base end support member 411 Shaft hole 412 Convex 413 Support hole 42 Tip side support member 421 Shaft hole 422 Recess 423 Arm 424 Bearing hole 5 Holding member 51 Pressing section 52 Clamping part 53 Clip body 54 Connecting part 55 Pressing pin 551 Axis 552 long hole 56 Spring 6 Holder 61 Tip mounting surface 62 Screw hole 7 Throw-away tip 74 Corner 75 screw holes 8 Screws 9 cutting tools

Claims

1. A handle and A screw tightening tool having a shaft portion having an engagement portion formed at a tip thereof for engaging with a screw, A support member is provided on the shaft portion and is rotatable relative to the shaft portion, A screw tightening tool, in which the support member is provided with a clamping member capable of elastically clamping a fixed member through which a screw engaged with the engagement portion is inserted.

2. The clamping member is disposed so that a tip side thereof opens and closes with respect to the shaft portion, 2. The screw tightening tool according to claim 1, wherein a tip end of the clamping member is opened by pressing a pressing portion provided on a base end of the clamping member with a finger.

3. the clamping member includes a clamping portion at a tip end thereof for clamping the fixed member, The screw tightening tool according to claim 1 or 2, wherein the clamping portion has a V-shaped cross section perpendicular to the extending direction of the shaft portion.

4. 4. The screw tightening tool according to claim 1, wherein the clamping member is a leaf spring.

5. 4. The screw tightening tool according to claim 2, wherein the clamping members are made of resin, and the tip ends thereof are closed by being pressed by a spring.

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