JPH037908Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Technical field of the invention The invention makes an electrical connection by press-fitting an electric wire into a press-fitting terminal such as a connector block with a simple operation, and also connects the electric wire with the remaining length at the same time as the press-fit connection is completed. The present invention relates to a portable electric wire push-cutting tool that can cut at a certain point.

(2) Prior art and its problems Electric wire pushing tools are widely used to easily and quickly connect electric wires to insulation displacement terminals provided in cable connectors of various electrical devices. This tool has the function of, when a covered wire is pushed into a contact terminal, the terminal breaks the covering and establishes an electrical connection, and also cuts off unnecessary portions of the wire upon completion of the connection.

Utility Model Publication No. 55-43680 has been proposed as a conventional tool of this type. This device has a pusher and a cutter fixed in parallel for pushing the wire into the pressure contact terminal. When installing the wire, the wire is pushed into the terminal using both the pusher and the cutter, and after the wire contacts the terminal base and the connection is completed, the cutter is further advanced to cut the wire. In this mechanism, the wire is attached and cut by applying the force required to push the wire in and a larger wire cutting force after the wire is pushed in.

The tool proposed in Utility Model Publication No. 56-33113 pushes the wire into a terminal using a cap, which is a pusher for the wire, and then grasps the handle lever and slides the cutter down to cut the wire.

If the former tool has a large resistance to attaching the wire to the terminal, the wire may break during the push-in process and cause attachment failures such as the wire falling out, requiring special skill to push in the wire. The latter required two operations, a pushing operation and a gripping operation, resulting in poor workability. In addition, both had complex functions and were large in size.

By the way, with recent advances in computerization, electronic equipment has become widespread even in general households, and the above-mentioned connector connection method is often used in such equipment. It is desirable that the tool for this purpose be sufficiently small and lightweight. Considering the pushing and cutting direction, a shape that can be grasped with fingers is excellent from an ergonomic point of view. Also, considering the fact that it can be brought into a home, it would be convenient if it was portable. At that time, you must protect your body from stubble, etc.

(3) Purpose of the invention Therefore, the present invention has miniaturized a tool that can automatically cut off the unnecessary part of the wire at the same time as pushing the wire into the insulation displacement terminal, and has made it possible to carry it while protecting the body from the cut part. , its main purpose.

(4) Features of the invention The portable electric wire push-cutting tool according to the invention for achieving the above object is characterized by a tool consisting of an elongated cylindrical casing and a cap with a clip that fits in the front of the casing. A cutter is integrally extended to the front of the casing, and a presser urged forward by an action member is arranged in parallel with the cutter at the front side of the inside of the casing.
A wire guide piece is provided along the wire axis direction between the pair of wire holding pieces on the tip end of the presser, and an impact member that is biased forward is built into the rear side of the casing. The impact member is retracted through the action member, and when the pushing reaches a certain amount, the action member and the impact member are disengaged, causing the impact member to rebound, thereby impacting the cutter of the casing and disconnecting the wire. The problem lies in the fact that it was cut off. Hereinafter, the present invention will be explained based on the drawings.

(5) An embodiment of the invention Fig. 1 is a perspective view showing a portable electric wire push-cutting tool according to the invention, Fig. 2 is a cross-sectional view of the same, and Fig. 3 is an enlarged end view showing the pushing surface of the pusher. Figures 4 to 6 are cross-sectional views illustrating the principle of operation of the same.

Thus, the tool has a so-called pencil shape, consisting of an elongated cylindrical casing 1 with a thickness that can be held like a pen, and a cap 2 fitted onto the front of the casing 1. A cutter 3 is integrally extended to the front of the casing 1, and inside the casing 1, a presser 4 biased forward by an action member 5 is arranged in parallel with the cutter 3. At the same time, an impact member 6 biased forward is built into the rear side.

To be more specific, the cylindrical casing 1 as a whole has a rod-like outer shape with a thickness that can be grasped, and the cutter cylindrical body 10
It is assembled from a guide cylinder 11 and a rear cylinder 12. The cutter cylinder 10 is assembled by screwing the threaded part 10a of the outer rear end into the threaded part 11a of the guide cylinder 11, and the cutter 3 is integrally extended from the front end, and the threaded part of the outer contracted part The threaded portion 20 of the cap 2 is removably screwed into the cap 10b. The interior of the cutter cylinder 10 has a space 10c on the rear side that is the same as the inner diameter part 11b of the guide cylinder 11, and a small diameter through hole 10d on the front side.

The presser 4 is slidably inserted through the through hole 10d of the cutter cylinder 10. Presser 4
has a push-in portion for the electric wire c at the front end, a sliding surface 40 for guiding the cutter 3 on one side, and an enlarged diameter portion 41 at the rear end. The push-in portion includes a pair of wire push-in pieces 4 spaced apart according to the width of the terminal t.
2, 42, cable holding grooves 43, 43 of the pushing pieces 42, 42, and a wire guide piece 44 provided in a straight line with the holding grooves 43, 43. The wire guide piece 44 protrudes to a height substantially equal to the bottom surface of the wire holding groove 43. Further, the expanded diameter portion 41 is slidably inserted into the internal space 10c of the cutter cylinder 10, and the front stage surface 45 is locked to the stepped surface 10e of the internal space 10c. A spherical portion 46 is formed on the rear surface of the expanded diameter portion 41 .

The cap 2 has a bottomed shape with approximately the same outer diameter as the cylindrical casing 1, and has a clip 2 on one side of the outer diameter.
2 is installed. The clip 22 is made by inserting the L-shaped insertion piece 23 from the side hole 21, and inserting the insertion piece 23 into the side hole 21.
It is screwed from the bottom end into a collar-shaped nut 25 fitted into a hole 24 with a screw 26.

Further, the guide cylinder 11 has a shoulder portion 13 projecting inward at the rear half of the inner diameter portion 11b, and the front cross section of the shoulder portion 13 is an inclined surface 14. Between the inner diameter portion 11b and the shoulder portion 13 and the inner space 10c of the cutter cylinder 10, a shaft rod 50 having a slightly smaller diameter than the inner diameter of the shoulder portion 13 and a push shaft 51 having an even smaller diameter than the shaft rod 50 are provided. , a circumferential slope 52 between the shaft rod 50 and the push shaft 51
The operating member 5 is housed therein. This action member 5 has a circumferential protrusion 53 formed on the shaft rod 50,
A coil spring 15 is inserted between the peripheral protrusion 53 and the shoulder portion 13.
The operating member 5 is brought into pressure contact with the expanded diameter portion 41 of the presser 4 through the interposition of the actuator 5 . This coil spring 15 is made up of a large diameter part 15a and an eccentric small diameter part 15b, and under normal conditions, the operating member 5 is connected to the inner diameter part 1 of the guide cylinder 11.
1b so that it is positioned in an inclined manner.

The guide cylinder 11 is assembled by screwing the rear outer threaded part 11c into the front threaded part 12a of the rear cylinder 12. The rear cylinder body 12 houses an impact member 6 that is biased forward by a spring 60 and is in contact with the shoulder portion 13 of the guide cylinder body 11 . This impact member 6 has a through hole 61 bored along its axis. This through hole 61 has a diameter larger than the outer diameter of the push shaft 51 of the working member 5, and is adapted to receive the push shaft 51. Further, the front opening of the through hole 61 has a raised portion 62 that is slightly raised at the periphery of the front opening.

Next, the operation of this embodiment will be explained with reference to FIGS. 4 to 6.

When not in operation, a cap 2 is fitted onto the cylindrical casing 1 and hung from clothing etc. via a clip 22. In this case, the action member 5 is pressed forward by the biasing force of the spring 15, whereby the pusher 4 is pushed forward via the enlarged diameter portion 41. Since the operating member 5 is held by the eccentric small diameter portion 15b of the spring 15, it is in an inclined state. Moreover, since the action member 5 is in contact with the spherical surface portion 46 of the expanded diameter portion 41, it stably maintains the inclined state.

When using the cap 2 and the cutter cylinder 10,
Remove the cap 2 while unscrewing the threaded parts 20 and 10b. Next, the electric wire c is fitted into the pressure contact terminal t, and the electric wire c is inserted into the electric wire holding groove 43 of the pusher 4.
Assign. Thereafter, when the casing 1 is pressed toward the terminal base b, the electric wire c is pushed in while the sheath is cut at the edge of the pressure contact terminal t and electrical continuity is established. At the same time, as a reaction to the pressing force on the electric wire, the presser 4 to the action member 5 retreat against the biasing force of the coil spring 15. As the action member 5 retreats, the impact member 6 retreats against the forward biasing force of the spring 60. At this time, the action member 5 is in an inclined state and comes into contact with the impact member 6 to transmit the backward motion. In this case, the raised portion 62 formed on the periphery of the working member 5 prevents it from accidentally falling into the through hole 61 .

When the cylindrical casing 1 is further pressed toward the terminal base b, the electric wire c comes into contact with the surface of the terminal base b, and the installation is completed. At this time, the peripheral slope 52 of the action member 5 is in contact with the inclined wall surface 14 of the shoulder portion 13 or is in a state of approaching. Further, the tip of the cutter 3 approaches the electric wire c so as to touch it. Therefore, when the pusher 4 is pushed in a little further, the action member 5 receives a tilt regulating force from the inclined wall surface 14 of the shoulder portion 13 and changes its posture so that it coincides with the axis of the guide member. As a result, the push shaft 51 is aligned with the through hole 61 of the impact member 6, and the impact member 6 is released from the restraint of the action member 5 and moves forward at once by the elastic force of the spring 60. The impact member 6 has the push shaft 5 of the action member 5 in its through hole 61.
1 collides with the shoulder 13 in a state where it is avoided. The collision impact at this time is transmitted to the cutter 3. This impact force causes the cutter 3 to move forward and cut the wire c that is in contact with the terminal base b.

When the above-described tool is removed after the wire has been installed and cut, the coil spring 15 causes the action member 5 and the pusher 4 to return to their normal forward positions.
The active member 5 assumes the tilted position again. At the same time, the impact member 6 also returns to its normal forward position due to the biasing force of the spring 60. In this way, press the wire with the pusher 4.
By simply pushing the wire into the press-contact terminal while holding it in place, the wire can be cut at the same time as the wire is installed using the pressing force applied during installation.

According to the above embodiment, the cylindrical casing 1 is formed by threading the cutter casing 10, the guide cylindrical body 11, and the rear cylindrical body 12, so that it can be easily assembled while storing each member inside. It has the advantage of being easy to manufacture.

In the above embodiment, the action member 5 is the impact member 6
Although a configuration in which the engagement is disengaged by engaging the through hole 61 has been described, the same effect can be obtained by applying other engagement/disengagement structures.

(6) Effects of the invention As explained above, the invention provides the following effects.

(a) Since the electric wire push-cutting tool is composed of an elongated casing and a cap, it can be easily hung in a pocket of clothing etc. via a clip, and the cutter and pusher can be protected by the cap, making the electric wire push-cutting tool easier. Can be carried safely.

(b) By attaching the cutter integrally to the cylindrical casing and incorporating various parts inside, it was possible to reduce the number of parts and achieve a reduction in size and weight.

(c) Since the wire guide piece is placed between the wire pushing pieces of the pusher, it is possible to prevent the wire from being pushed in in a raised state and not being pushed in enough, and to prevent connection failures due to the wire being pushed in a substantially straight line. was able to prevent it.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a portable electric wire push-cutting tool according to the present invention, Figure 2 is a cross-sectional view of the same, Figure 3 is an enlarged end view showing the pushing surface of the pusher, and Figures 4 to 6. The figure is a sectional view illustrating the principle of operation of the same as above. 1...Tubular casing, 2...Cap, 3...
...Cut, 4...Press element, 5...Action member, 6...
Impact member, 10...Cut cylinder body, 11...Guide member, 12...Rear cylinder body, 13...Shoulder part, 22...
Clip, 42...Electric wire pushing piece, 44...Electric wire guide piece, 50...Shafting piece.

Claims (1)

[Scope of utility model registration request] The tool consists of a slender cylindrical casing and a cap with a clip that fits in the front of the casing, and a cutter is integrally extended in the front of the casing, and an operating member is provided on the front side of the inside of the casing to allow the cutter to extend forward. A presser element, which is biased to An impact member is built in, and when the pusher is pushed in, the impact member is retracted via the action member, and when the push reaches a certain amount, the action member and impact member are disengaged, causing the impact member to move back. A portable electric wire push-cutting tool characterized in that the electric wire is cut by rebounding and applying an impact to the cutter of the casing to cut the electric wire.