JP7654220B2 - Screw tightening tool - Google Patents

Description

The present invention relates to a screw tightening tool for fastening and removing screws that fasten a member to be fastened.

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 from the holder 6. A throw-away tip 7 with multiple cutting edges is intended to be usable until all cutting edges wear out, and is relatively expensive, so preventing the loss of throw-away tips 7 helps reduce manufacturing costs.

As described in Patent Document 1, it is known to provide a tool such as a screwdriver with a member for holding the screw in order to prevent the screw from falling out of the tool when it is attached or detached. However, while such a tool can prevent the screw from falling out, it cannot prevent the fixed member, such as a throw-away tip, which is fixed by the screw, from falling out. Patent Document 2 also describes a wrench that uses a magnet to prevent the fall-out of a throw-away tip made of a magnetic material, but this wrench cannot prevent the fall-out of a fixed member made of a material that is not attracted to a magnet, such as ceramic.

JP 2000-135685 A Japanese Patent Application Publication No. 10-296647

The problem that this invention aims to solve is to provide a screw tightening tool that can solve the above-mentioned problems of the conventional screw tightening tool and can hold a screw and a member to be fixed through which the screw is inserted.

To solve the above problem, a screw tightening tool is provided that has a handle and a shaft portion having an engagement portion formed at the tip thereof that engages with a screw, 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 member to be fixed through which a screw engaged with the engagement portion is inserted.

It is also preferable that the clamping member is arranged so that the tip side opens and closes relative 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.

The clamping member is preferably provided with a clamping portion at the tip side for clamping the fixed member, and the clamping portion is preferably configured so that a cross section perpendicular to the extension direction of the shaft portion is formed in a V-shape.

It is also preferable that the clamping member be made of a leaf spring.

It is also preferable that the clamping member is made of resin and that the tip side closes when pressed by a spring.

The present invention makes it possible to provide a screw tightening tool that can hold a screw and a fixed member through which the screw is inserted.

FIG. 1 is a front view of a screw tightening tool according to a first embodiment. FIG. 2 is a side view of the screw tightening tool of the first embodiment. 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. FIG. 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 a state in which the shank and the clip body are open, and (B) shows a state in which the throw-away tip with a screw inserted therethrough is clamped between the shank and the clamping part of the clip body. This is a cross-sectional view taken along line VV of Figure 4(B). FIG. 11 is a perspective view of a screw tightening tool according to a second embodiment. FIG. 6 is a partial cross-sectional view of a screw tightening tool according to a second embodiment. FIG. 11 is a perspective view of a screw tightening tool according to a third embodiment.

The following describes the embodiment of the invention. As shown in Figs. 1 and 2, the screw tightening tool 1 of 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 that it cannot 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 the fixed member through which the screw engaged with the engagement portion 31 is inserted.

The clamping member 5 will be described. As shown in FIG. 2, the clamping member 5 of the first embodiment is formed using a single 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 that is 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 that is located on the engagement portion 31 side is the tip side. In the first embodiment, the connecting portion 54 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 underside 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 so as to be swingable relative to the support member 4.

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 on the tip side that can elastically clamp the fixed member. 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 folded along the slit as 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 the clamping portion 52 to clamp even a fixed member with a shape without corners more stably.

As described above, the connecting portion 54 is formed by cutting out and bending a portion of the clip body 53, which is 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.

Next, a method for clamping a fixed member through which a screw is inserted, using 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 that is attached to a holder 6 of a cutting tool 9 with an indexable cutting edge. In this example, the throw-away tip 7 is approximately 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. Furthermore, the material of the throw-away tip 7 is not limited to ceramic and may be other materials such as metal.

As shown in FIG. 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. The corners 74 are the corners of the rake face 71, and the corners 74 on both the upper and lower sides are sequentially positioned in the usage position, and the throw-away tip 7 is discarded after all the cutting edges 73 have been used.

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 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 scooping surface 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.

When the above-mentioned throw-away tip 7 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, the clamping member 5 is connected to the support member 4, which is rotatable relative to the shaft portion 3, so the shaft portion 3 can be rotated while the throw-away tip 7 is still clamped to tighten the screw 8.

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. After that, 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 still being 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.

Next, the second embodiment will be described. As shown in FIG. 6, in the second embodiment, the screw tightening tool 1 is provided with a resin clamping member 5. The clamping member 5 of the second embodiment is entirely made of resin and includes a clip body 53 whose approximate center is bent in 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 the 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.

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 an axial hole 411 formed in the center of the base end support member 41 and an axial hole 421 formed in the tip end support member 42. The tip end support member 42 has two arms 423 that extend in one direction from the side surface and face each other. The arms 423 are formed with a bearing hole 424 that receives the connecting portion 54, and the connecting portion 54 is supported by the bearing hole 424, so that the clamping member 5 is supported to the arms 423 so as to be swingable about the connecting portion 54 as a support axis.

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

As mentioned 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 using a pressing pin 55 and a spring 56, the clamping portion 52 at the tip is pressed against the engaging portion 31, making it possible to elastically clamp the fixed member.

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 has a long 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 long 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 can slide in a direction perpendicular to the shaft portion 3 within the range of the longitudinal dimension of the long hole 551.

A spring 56 is provided between the pressing pin 55 and the pressing portion 51. By pressing the pressing pin 55 towards the pressing portion 51, the clamping portion 52 at the tip side is biased so as to be pressed against the engagement 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.

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, insert the pressing pin 55 into the base end support member 41, and then insert the shaft portion 3 through the shaft hole 411 and the long hole 552; then, fit the tip end support member 42, which is in a two-part state, so as to sandwich the shaft portion 3 and the protruding portion 412 of the base end support member 41, and connect it to the base end support member 41.

As a third embodiment, the screw tightening tool 1 may be provided with 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 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, 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 being connected in series, and the portion at the tip 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.

The clamping member 5 in the third embodiment is also made of resin, and the support member 5 alone does not have elasticity. As such, as in 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.

Although the present invention has been described above using the embodiments as examples, the present invention is not limited to the above embodiments and can be implemented in various forms. 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.

The clamping member 5 may also be configured to be pressed against the shaft portion 3 by being biased by a torsion coil spring or the like. The clamping portion 52 may also 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 opposite direction to the shaft portion 3, but the tip of the clamping portion 52 may also 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, further preventing the fixed member from falling off.

The member to be fastened is not limited to the throw-away tip 7, and the screw tightening tool 1 can be applied to other members to be fastened. In addition, although the screw tightening tool 1 in this embodiment is a wrench, it may also be a screwdriver.

REFERENCE SIGNS LIST 1 Screw tightening tool 2 Handle 3 Shaft portion 31 Engagement portion 4 Support member 41 Base end side support member 411 Shaft hole 412 Convex portion 413 Support hole 42 Tip end side support member 421 Shaft hole 422 Concave portion 423 Arm portion 424 Bearing hole 5 Clamping member 51 Pressing portion 52 Clamping portion 53 Clip body 54 Connecting portion 55 Pressing pin 551 Shaft 552 Long hole 56 Spring 6 Holder 61 Tip mounting surface 62 Screw hole 7 Throw-away tip 74 Corner 75 Screw hole 8 Screw 9 Cutting tool

Claims (5)

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. 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. 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 direction in which the shaft portion extends. A screw tightening tool according to any one of claims 1 to 3, wherein the clamping member is made of a leaf spring. The screw tightening tool according to claim 2 or 3, in which the clamping member is made of resin and the tip side closes when pressed by a spring.

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