JP2001185879A - Tool for clamp springs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely mount a clamp spring on a connected body, improve mounting/removing the clamp spring on/from the connected body, and maintain compact and handy characteristics. SOLUTION: In the tool for clamp springs having an expanding-shrinking mechanism for expanding and shrinking both ends of the approximately U-shaped clamp spring and a handle for driving the expanding-shrinking mechanism, the expanding-shrinking mechanism has a straight disposed shaft and is connected to the handle to move in the axial direction of the shaft, thereby expanding/shrinking the clamp spring, or not connected to the handle and rotates with center at the shaft to vary the position, relative to the handle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a small, hand-held clamp spring tool for attaching and detaching a substantially U-shaped clamp spring to and from an object to be connected.

[0002]

2. Description of the Related Art Generally, in wiring such as electric wires and optical fibers, a clamp spring is used to ensure connection of a connector for connecting wiring. The clamp spring is formed in a substantially U-shape, and its upright ends are elastically engaged with the ends of the object to be connected comprising the connection connector. When attaching and detaching the clamp spring to and from the object to be connected, it is necessary to use a tool corresponding to the clamp spring having a strong elastic force.

[0003] In addition, the work of connecting wires such as electric wires and optical fibers is often performed in a narrow place such as the inside of a wiring box, or at a high place or a low place with poor scaffolding. For this reason, a small hand-held type is widely used as a clamp spring tool for attaching and detaching the clamp spring to and from the object to be connected.

[0004] Conventionally, as a small hand-held type clamp spring tool, for example, the one described in Japanese Patent No. 2644274 is known.

[0005] This conventional clamp spring tool includes:
A clamp spring is attached to and detached from an object to be connected composed of an optical connector. The clamp spring includes an expansion / contraction mechanism that expands / contracts both ends of the clamp spring, and a handle that includes two operation pieces rotatably connected and drives the expansion / contraction mechanism. It becomes. The expansion and contraction mechanism
A pair of locking portions are provided, each of which is fixed to the distal end portion of the handle, and which locks both ends of the clamp spring.

According to this conventional clamp spring tool, when the handle is grasped, the two locking portions are separated from each other to expand both ends of the clamp spring. Shrink both ends. With both ends of the clamp spring expanded,
Since the elastic pressure of the clamp spring does not act on the object, the object can be easily attached to and detached from the clamp spring. In a state where both ends of the clamp spring are contracted, the elastic force of the clamp spring acts on the object, so that the object is mounted on the clamp spring.

[0007]

In the conventional clamp spring tool, since both locking portions of the expansion and contraction mechanism are fixed to the operation piece of the handle, wiring for wires such as electric wires and optical fibers which have a limited working space. At the connection work place, both locking portions of the expansion / contraction mechanism must be aligned with the position of the object by twisting the hand or the like, and there is a problem that the workability of attaching and detaching the clamp spring to and from the object is poor.

It is easily conceived that such a problem can be solved by incorporating a complicated slide mechanism, a rotation mechanism, and the like in a large clamp spring tool installed on a tabletop, a floor, or the like. However, in a small-sized hand-held type, a new problem such as an increase in weight due to the incorporation of a complicated slide mechanism, a rotation mechanism, and the like, impairing the hand-held property is caused.

The present invention has been made in view of such problems, and allows a clamp spring to be precisely mounted on an object to be connected, and the workability of attaching and detaching the clamp spring to and from the object to be connected is good. An object of the present invention is to provide a small hand-held clamp spring tool.

[0010]

Means for Solving the Problems In order to solve the above-mentioned problems, a clamp spring tool according to the present invention employs the following means.

That is, in the clamp spring tool according to the present invention, there is provided a clamp spring tool having an expansion and contraction mechanism for expanding and contracting both ends of a substantially U-shaped clamp spring which is elastically engaged with an object to be connected, and a handle for driving the expansion and contraction mechanism. The expansion / contraction mechanism includes a shaft disposed in a straight line, moves in the axial direction of the shaft in cooperation with the handle, expands / contracts the clamp spring, and rotates around the shaft without cooperation with the handle to adjust the position with respect to the handle. It is characterized by being variable.

In this means, when the clamp spring is expanded by rotating the expansion / contraction mechanism, the clamp spring is not twisted, so that the clamp spring can be accurately mounted on the object to be connected. Further, since the position of the handle relative to the handle can be changed by rotating the expansion / contraction mechanism around the shaft, the expansion / contraction mechanism can be easily adjusted to the position of the object to be connected in accordance with the connection work place. Workability for attaching and detaching the clamp spring is improved. The compact structure using the shaft of the expansion / contraction mechanism retains the characteristics of a small hand-held type.

According to a second aspect of the present invention, in the clamp spring tool of the first aspect, the shaft of the expansion / contraction mechanism is fixed to one operation piece of a handle having two operation pieces rotatably connected. It is slidably and rotatably supported by the support base.

According to this means, the expanding / contracting mechanism is securely supported by the one operation piece of the handle via the support base.

According to a third aspect of the present invention, in the clamp spring tool according to the second aspect, the expansion and contraction mechanism is fitted to the shaft, and the movement of the shaft in the axial direction is prevented by the support base. And a movable locking portion fixed to the shaft and locked to the other end of the clamp spring.

In this means, the fixed locking portion and the movable locking portion of the expansion / contraction mechanism are compactly supported on the support base via the shaft.

According to a fourth aspect of the present invention, in the clamp spring tool of the third aspect, between the fixed locking portion and the movable locking portion of the expansion and contraction mechanism, the movable locking portion is moved in the axial direction of the shaft. And a guide structure for guiding the fixed locking portion and the movable locking portion to rotate integrally with each other about the shaft.

In this means, the movement and rotation of the fixed locking portion and the movable locking portion of the expansion / contraction mechanism are reliably guided by the guide structure.

According to a fifth aspect of the present invention, in the clamp spring tool according to the third or fourth aspect, the other operating piece of the handle is a fork-shaped linking end that abuts on the movable locking portion while avoiding the shaft of the expansion / contraction mechanism. It is characterized by having.

According to this means, the other operating piece of the handle smoothly moves the movable locking portion of the expansion / contraction mechanism by the fork-shaped linking end.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a clamp spring tool according to the present invention will be described with reference to the drawings.

In this embodiment, similarly to the above-described conventional example, a clamp spring S is attached to and detached from an object C comprising an optical connector, provided with a handle 1 and an expansion / contraction mechanism 2.

As shown in FIGS. 1 and 2, the handle 1 of this embodiment has two operation pieces 11 and 12 made of a synthetic resin material rotatably assembled to secure lightness. Become.

The one operation piece 11 is formed by forming two substantially rectangular plates 111 and 112 having a size that can be gripped by the palm into a U-shape via an elongated side plate 113. Shaft holes 114 and 115 for connecting to the other operation piece 12 are formed in the longitudinal ends of the plates 111 and 112. Shaft holes 114, 11 in side plate 113
A stopper 116 for regulating the rotation area of the other operation piece 12 is provided near the end opposite to 5. The stopper 116 includes a screw hole 116a drilled in the side plate 113 and a stopper screw 116b screwed into the screw hole 116a. The rotation range of the other operation piece 12 is adjusted by advancing and retreating by rotation of the stopper screw 116b. You can do it.

The other operating piece 12 is a fan-shaped 12 having a small opening angle and housed inside the U-shaped of the one operating piece 11.
1 is formed into a deformed long plate shape provided with a reinforcement 122 around the periphery thereof. Shafts 123 and 124 that fit into the shaft holes 114 and 115 of the operation piece 11 protrude from both sides of the fan-shaped center side end of the main body 121. A link end 125 for linking with the enlargement / reduction mechanism 2 protrudes from a corner of the end on the fan-shaped outer peripheral side of the main body 121. The linking end 125 is formed in a fork shape in which bifurcated linking pieces 125b and 125c are branched from the neck 125a so as to avoid a shaft 21 of the expansion / contraction mechanism 2 described later. Grooves 125d, 125e, 125 for facilitating the flow of molding material during molding are formed on both side surfaces of the neck portion 125a of the link end portion 125 and the inner surfaces of the link pieces 125b, 125c.
f, 125 g are engraved. Also, the link end 125
On the outer surfaces of the linking pieces 125b and 125c, three long hole-shaped positioning grooves 125h for fixing the position of the expansion / contraction mechanism 2 through a 90-degree angle are formed.

A support base 3 made of a metal material is fixed to the handle 1.

The support base 3 is provided with one operation piece 1 of the handle 1.
Deformation in which two foot plates 31 and 32 that are fitted in contact with the inner surfaces of the ends opposite to the shaft holes 114 and 115 of the first plates 111 and 112 are extended from the bottom surface side of the hook portion 33. It is formed into a block shape. On one foot plate 31, two screw holes 311 and 312 for tightening and fixing with screws 4 to the plate 111 of one operation piece 11 of the handle 1 are drilled. The other foot plate 3
2, one screw hole 321 for tightening and fixing to the plate 112 of one operation piece 11 of the handle 1 with the screw 4 is formed. Further, the block portion 33 includes the expansion / contraction mechanism 2.
A large-diameter first insertion hole 331 and a small-diameter second insertion hole 332 for supporting the diaper are formed to penetrate coaxially and continuously in an axial direction of the semicylindrical shape. For the second insertion hole 332 of the block portion 33, the slit 33
3 is notched.

As shown in detail in FIGS. 3 and 4, the expansion and contraction mechanism 2 of this embodiment is a metal material that is inserted into and supported by the first insertion hole 331 and the second insertion hole 332 of the support base 3. A coil spring 22, a fixed locking portion 23, and a movable locking portion 24, which are formed of a metal material, are assembled to a straight shaft 21 formed by the above.

The shaft 21 has an axial length much shorter than the axial length of the first insertion hole 331 of the support base 3.
Large diameter portion 21 rotatably and slidably fitted to 31
1, the first insertion hole 331 of the support base 3, the second insertion hole 3
A small-diameter portion 212 rotatably and slidably fitted in the second insertion hole 332 with an axial length much longer than the sum of the axial lengths of the small-diameter portion 32 and an end of the small-diameter portion 212 on the opposite side to the large-diameter portion 211. And a retaining groove 213 formed in an annular shape.

The coil spring 22 has a diameter that can be accommodated in the first insertion hole 331 of the support base 3, and allows the large-diameter portion 211 of the shaft 21 inserted in the first insertion hole 331 of the support base 3 to move through the second diameter. It is pressed in the direction opposite to the insertion hole 332.

The fixed locking portion 23 includes a clamp spring S
A pair of opposed ridge-shaped locking projections 231 and 232 to which an S-shaped locking piece Sa formed at one end of the locking projection is locked;
The support legs 233 and 234 for integrally reinforcing and supporting the locking projections 231 and 232, the substrate 235 serving as a base for raising the support legs 233 and 234 from the ends, and the support legs 233 and 234 of the substrate 235 stand. The slit 33 of the support base 3 extends in the orthogonal direction from the center of the surface opposite to the raised surface.
3 and a through hole 23 through which the small-diameter portion 212 of the shaft 21 is inserted.
7 The support legs 233 and 23 of the substrate 235
The movable locking portion 2 is provided at the end opposite to the side where
4 and an elongated guide groove 238 which forms the guide structure a is cut in the support legs 233 and 234 direction.

The movable locking portion 24 includes a clamp spring S
A pair of opposed ridge-shaped locking projections 241 and 242 to which an S-shaped locking piece Sa formed on the other end of the locking projection is locked;
Supporting legs 243 and 244 for integrally supporting the locking projections 241 and 242; a connecting plate 245 having the supporting legs 243 and 244 extended and connected in a semicircular shape;
6, a fitting hole 246 into which the end of the small-diameter portion 212 of the shaft 21 is fitted, and a stopper for fixing the shaft 21 by being abutted against the retaining groove 213 of the shaft 21 fitted into the fitting hole 246. Screw 247 and fitting hole 246 of connecting plate 245
Of the other operation piece of the handle 1 protruded from the support legs 243 and 244 near the
And a single cylindrical positioning projection 248 that protrudes into the positioning groove 125h of the link end 125. In addition, between the support legs 243 and 244, the guide groove 23 of the fixed locking portion 23 is provided.
An elongated guide protrusion 249 which slide-fits with 8 to form the guide structure a is provided to protrude.

The expansion / contraction mechanism 2 is supported by the support base 3 with the linking end 125 of the other operation piece 12 of the handle 1 disposed between the movable locking portion 24 and the support base 3.

According to this embodiment, the expansion / contraction mechanism 2 is mounted on the support base 3 fixed to the handle 1 using the shaft 21.
Is mounted and supported compactly. Therefore, the characteristics as a small hand-held type are maintained.

In using this embodiment, first,
As shown in FIG. 5, the locking projections 231 and 232 of the fixed locking portion 23 of the expansion and contraction mechanism 2 and the locking projection 24 of the movable locking portion 24 are provided.
The locking pieces Sa at both ends of the clamp spring S are hung on the first and second 242. At this time, the locking projection 2 of the fixed locking portion 23
31 and 232 and locking projections 241 and 24 of the movable locking portion 24
2 has a ridge shape, so that the locking piece Sa of the clamp spring S can be easily slid by sliding it in and pushing it.

In the state shown in FIG. 5, the movable locking portion 24 is moved by the elastic force of the coil spring 22 of the expansion and contraction mechanism 2.
Presses against the link end 125 of the other operation piece 12 of the handle 1, and the positioning protrusion 248 of the movable locking portion 24
5 is inserted into the positioning groove 125h. A guide structure a provided between the fixed locking portion 23 and the movable locking portion 24 of the expansion / contraction mechanism 2 is engaged. Therefore, when the clamp spring S is applied, the expansion / contraction mechanism 2 does not unexpectedly operate.

Next, the object C is placed on the clamp spring S. Note that the connection object C may drop into the central portion Sb between the locking pieces Sa after the clamp spring S expands as described later.

Subsequently, the handle 1 is gripped and the operation pieces 11 and 12 are held.
Is rotated.

When the operating pieces 11 and 12 of the handle 1 are rotated, as shown in FIG. 6, the linking end 125 of the other operating piece 12 of the handle 1 tilts while the movable locking portion of the expansion / contraction mechanism 2 is tilted. 2
4 support base 3 against the pressure of coil spring 22.
Slide away from. As a result, the locking pieces Sa at both ends of the clamp spring S are expanded, and the object C is dropped into the central portion Sb between the locking pieces Sa.
At this time, the locking projections 231 and 232 of the fixed locking portion 23 and the movable locking portion 2 are fixed by the straight shaft 21 of the expansion / contraction mechanism 2.
The four locking projections 241 and 242 are separated in the linear direction. Therefore, the central portion S of the clamp spring S
Thus, the clamp spring S can be precisely mounted on the object C without being bent as in the conventional example described above.

It should be noted that, in the state shown in FIG.
The five slot-shaped positioning grooves 125h allow the link end 125 to tilt. Further, the engagement of the guide structure a of the expansion / contraction mechanism 2 is maintained.

Thereafter, the grip of the handle 1 is released.

When the grip of the handle 1 is released, the expansion / contraction mechanism 2
The movable locking portion 24 and the linking end portion 125 of the other operation piece 12 of the handle 1 return to the original position by the elastic pressure of the coil spring 22. As a result, the locking pieces Sa at both ends of the clamp spring S are elastically engaged with the connected object C.

When removing the clamp spring S from the object C, the clamp pieces Sa at both ends of the clamp spring S can be expanded so that the object C can be taken out. .

Further, in this embodiment, FIGS.
As shown in the figure, the fixed locking portion 23 and the movable locking portion 24 of the expansion / contraction mechanism 2 can be rotated 90 degrees left and right together with the shaft 21 while maintaining the state in which the guide structure a is engaged.

At each rotational position to the left and right, another position in which the positioning protrusion 248 of the movable locking portion 24 of the expansion / contraction mechanism 2 is 90 degrees in phase with the linking end portion 125 of the other operation piece 12 of the handle 1. There is no structural change outside the recess 125h. Therefore, the clamp spring S can be attached to and detached from the object C in the same manner as described above.

Therefore, the fixed locking portion 23 and the movable locking portion 24 of the enlargement / reduction mechanism 2 can be easily adjusted to the position of the connection target C corresponding to the connection work place. Therefore, as in the above-described conventional example, the fixed locking portion of the expansion and contraction mechanism 2 is moved to the position of the object C by twisting the hand at the connection work place of the wiring such as the electric wire and the optical fiber where the work space is restricted. Since there is no need to match the movable locking portion 23 and the movable locking portion 24, the workability of attaching and detaching the clamp spring S to and from the connected object C is improved.

As described above, in addition to the illustrated embodiment, the rotation angle of the expansion / contraction mechanism 2 about the shaft 21 can be set to other than 180 degrees.

[0048]

As described above, the clamp spring tool according to the present invention does not twist the clamp spring when the clamp spring is expanded by rotating the expansion / contraction mechanism. There is an effect that the clamp spring can be precisely mounted on the object without being bent.

Further, the position of the expanding / contracting mechanism with respect to the handle can be changed by rotation about the shaft.
The expansion / contraction mechanism can be easily adjusted to the position of the object to be connected in accordance with the connection work place, and the workability of attaching and detaching the clamp spring to and from the object to be connected is improved.

Further, since the expansion / contraction mechanism has a compact structure using a shaft, there is an effect that the characteristics of a small hand-held type are maintained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a clamp spring tool according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an exploded perspective view of a main part of FIGS. 1 and 2;

FIG. 4 is an assembled state diagram of FIG. 3;

FIG. 5 is an enlarged sectional view showing the operation of FIGS. 3 and 4.

FIG. 6 is an operation change diagram of FIG. 5;

FIG. 7 is an enlarged sectional view showing another operation of FIGS. 3 and 4;

8 is an operation change diagram of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handle 11,12 Operation piece 125 Linking end part 2 Expansion / contraction mechanism 21 Shaft 23 Fixed locking part 24 Movable locking part 3 Support base C Connected object S Clamp spring a Guide structure

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Daisuke Takamiya 3-18-14 Takada, Toshima-ku, Tokyo F-term in Hakusan Seisakusho Co., Ltd. 2H036 QA24 4E353 AA05 AA11 CC16 DD10 DD11 DR12 GG24

Claims (5)

[Claims] An expansion / contraction mechanism for expanding / contracting both ends of a substantially U-shaped clamp spring elastically engaged with an object to be connected,
A tool for a clamp spring having a handle for driving an expansion / contraction mechanism, wherein the expansion / contraction mechanism includes a shaft disposed in a straight line, and moves in the axial direction of the shaft in cooperation with the handle to expand / contract the clamp spring. A tool for a clamp spring, wherein the tool rotates about a shaft and does not link with the handle to change its position with respect to a handle. 2. The clamp spring tool according to claim 1, wherein the shaft of the expansion / contraction mechanism is slidable on a support base fixed to one operation piece of a handle having two operation pieces rotatably connected. A clamp spring tool rotatably supported. 3. The clamp spring tool according to claim 2, wherein the expansion / contraction mechanism is fitted to the shaft, the movement of the shaft in the axial direction is prevented by the support base, and one end of the clamp spring is locked. A clamp spring tool, comprising: a fixed locking portion; and a movable locking portion fixed to a shaft and locked to the other end of the clamp spring. 4. The tool for a clamp spring according to claim 3, wherein a fixed locking portion and a movable locking portion of the expansion / contraction mechanism are provided.
A clamp spring having a guide structure for guiding the movement of the movable locking portion in the axial direction of the shaft and the integral rotation of the fixed locking portion and the movable locking portion about the shaft. Tools. 5. The tool for a clamp spring according to claim 3, wherein the other operating piece of the handle has a fork-shaped linking end that abuts on the movable locking portion while avoiding the shaft of the expansion / contraction mechanism. Clamp spring tool characterized by the following