JPH025509Y2 - - 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 to a predetermined position as soon as the press-fit connection is completed. This invention relates to an electric wire push-cutting jig that can cut electric wires.

(2) Prior art and its problems Electric wire push-cut jigs are widely used to easily and quickly connect electric wires to insulation displacement terminals provided in cable connectors of various electrical devices.
This jig has the function of pushing a covered electric wire into a press-contact terminal, the terminal breaks the sheath and establishes an electrical connection, and also cuts off an unnecessary portion of the wire at the same time as the connection is completed.

Utility Model Publication No. 55-43680 has been proposed as a conventional jig 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 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 Japanese Utility Model Publication No. 56-33113 pushes the wire into a terminal using a cap, which is a pusher for the wire, and then grips the handle lever and slides the cutter down to cut the wire.

With the former tool, if there is a high resistance to attaching the wire to the terminal, the wire may break during the push-in process, resulting in poor attachment, such as the wire falling out, and therefore requires special skill to push the wire into the terminal.
The latter required two operations, a pushing operation and a gripping operation, resulting in poor workability. In addition, both had drawbacks such as complicated mechanisms and high product prices.

(3) Purpose of the invention Therefore, the present invention enables reliable wire installation and connection with the simple operation of pushing the wire into the insulation displacement terminal, and also removes unnecessary parts of the wire as soon as the insertion is completed without the need for any special work. The main purpose of this invention is to provide a wire push-cutting jig with a simple structure that can automatically cut the wire.

(4) Means for Solving the Problems The electric wire push-cutting jig according to the present invention to achieve the above object has a cutter integrally protruding from the front of a grippable elongated housing, and a spring at the rear end. An adjustment screw is provided, and inside the housing there are provided an impact member that is biased forward by the spring from the rear of the housing, an action member that abuts the impact member and is engaged in an inclined state, and an action member that is engaged with the impact member in an inclined state. A presser element that is in contact with and is urged forward of the housing and is arranged in parallel with the cutter is slidably provided, and when the presser presses in, the impact member is retreated via the action member, so that the amount of pushing is constant. When the amount is reached, the action member is straightened and disengaged from the impact member,
This structure is characterized by a structure in which the impact member bounces back and applies an impact to the cutter of the housing.

(5) Action Adjust the adjustment screw to set the cutting force according to the diameter of the wire to be cut. Next, the housing is grasped and the electric wire is pressed onto the clip terminal using the pusher. As the presser is pushed in, the impact member is retracted via the action members that abut each other in the middle.
When the pushing amount reaches a certain level, the electric wire is pushed into the clip terminal and connected, and at the same time, the inclination of the working member is corrected and becomes straight. Along with this, the action member engages in the through hole of the impact member, so that the action member and the impact member are disengaged.

As a result, the impact member applies an impact to the housing according to its force, and the impact is applied to the cutter integrated with the housing, resulting in the excess length of the wire being cut off between it and the insulating base.

(6) Embodiment of the invention Figure 1 is a partially cutaway perspective view showing the internal mechanism of the electric wire push-cutting jig according to the invention, and Figures 2 to 4 are side cross-sections illustrating the operating principle of the same. It is a diagram.

In the figure, 1 is a hollow housing consisting of a pair of upper and lower lids. A cylindrical guide member 2 is housed inside the housing 1. This guide member 2 has an inwardly projecting shoulder 3 in its middle part.
Here, the wall surface 4 of the front portion of the shoulder portion 3 (on the right side in the figure) is inclined.

The guide member 2 has a threaded portion 2a at its front end, and the threaded portion 5a of the cutter mounting tube 5 is screwed into the threaded portion 2a. The rear part of the cutter mounting tube 5 is a guide member 2.
The front part has a small diameter through hole 5b with the same space as the inner diameter of
is installed. Further, the cutter mounting tube 5 has a front end partially extending forward to form a cutter 6.

Reference numeral 7 denotes a presser which is slidably fitted into the through hole 5b of the cutter mounting tube 5. This presser 7 has a sliding surface 8 at the front for guiding the cutter 6, and a sliding surface 8 at the tip.
It has a cable holding groove 9 in a direction perpendicular to the . Further, terminal receiving grooves 10, 10 parallel to the sliding surface are provided.

A bulging portion 11 having an outer diameter approximately equal to the inner diameter of the cutter mounting tube 5 is connected to the rear end of the presser 7 . The rear surface 12 of this expanded diameter portion 11 has a spherical shape.

Between this enlarged diameter part 11 and the shoulder part 3 of the guide member 2, there is a shaft rod 13a having a diameter slightly smaller than the inner diameter of the shoulder part 3.
And, the push shaft 13b has a smaller diameter than this shaft rod 13a.
An operating member 13 consisting of a circumferential slope 13c is housed between the shaft rod 13a and the push shaft 13b. This action member 13 has a peripheral protrusion 14 formed on the shaft rod 13a,
A coil spring 15 is interposed between the circumferential protrusion 14 and the shoulder portion 3 of the guide member 2 to press the operating member 13 into contact with the expanded diameter portion 11 of the pusher 7. The coil spring 15 is composed of a large diameter part 15a coaxial with the guide member 2 and a small diameter part 15b eccentrically arranged, so that the operating member 13 is normally positioned in an inclined manner inside the guide member 2.

An impact member 17 biased forward by a spring 16 is built into the rear portion of the shoulder portion 3 of the guide member 2. A through hole 18 is bored in this impact member 17 along its axis. This through hole 18 has a diameter larger than the outer diameter of the push shaft 13b of the action member 13, and is adapted to receive the push shaft 13b. Further, the front opening of the through hole 18 has a raised portion 19 that is slightly raised around the periphery thereof.

Reference numeral 20 denotes a mounting screw that is screwed into a threaded mounting hole 21 formed in the side surface of the housing 1 and engaged with the outer circumference of the shoulder portion 3 of the guide member 2.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 to 4.

When not in operation, the action member 13 housed inside the guide member 2 is pressed forward by the biasing force of the spring 15, whereby the pusher 7 is pushed forward via the expanded diameter portion 11. It's summery. Since the action member 13 is held by the eccentric small diameter portion 15b of the spring 15, it is inclined with respect to the axis of the guide member 2. In addition, since the surface of the action member 13 in contact with the expanded diameter portion 11 is the spherical surface 12, the action member 13 stably maintains its inclined state.

When attaching the wire c to the pressure contact terminal, the wire c is fitted into the pressure contact terminal t, and the cable holding groove 9 provided at the tip of the presser 7 is applied to the wire c.
(FIG. 2) At this time, the pressure contact terminal t is positioned so as to face the terminal receiving groove 10. Next, when the housing 1 is pressed toward the terminal base b, the electric wire c is pushed in while the insulation is cut at the edge of the pressure contact terminal t and electrical continuity is maintained. At the same time, as a reaction to the pressing force on the electric wire, the presser 7 to the operating member 13 retreat against the biasing force of the coil spring 15. Working member 1
3 retreats, the impact member 17 resists the forward biasing force of the spring 16 and retreats. (FIG. 3) At this time, the action member 13 is in an inclined state and comes into contact with the edge of the through hole 18 of the impact member 17, thereby transmitting the backward motion. In this case, the protuberance 19 formed on the periphery of the through hole 18 prevents the working member 13 from falling into the through hole 18 inadvertently.

When the housing 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 13 of the action member 13
c is in contact with the shoulder portion of the guide member 2 and the inclined wall surface 4, or is in a state of approaching. Also, Katsuta 6
The tip of is close enough to touch the electric wire c. Therefore,
When the presser 7 is pushed in a little further, the action member 13
is subjected to an inclination regulating force on the inclined wall surface 4 of the shoulder portion 3 and changes its posture so as to coincide with the axis of the guide member. As a result, the push shaft 13b of the action member 7 is aligned with the through hole 18 of the impact member 17, and the impact member 17 is aligned with the through hole 18 of the impact member 17.
Once the restraints are released, the spring force of Ne16 causes it to move forward at once. The impact member 17 collides with the shoulder portion 3 with its through hole 18 avoiding the push shaft 13b of the action member 13. At this time, the collision impact is caused by the guide member 2
and is transmitted to the cutter 6 via the cutter mounting cylinder 5. This impact force causes the cutter 6 to move forward and cut the wire c that is in contact with the terminal base b. (Fig. 4) When the above-described jig is removed after the wire has been installed and cut, the coil spring 15 causes the action member 13 and the pusher 7 to return to the normal forward position, and the action member 13 returns to the tilted state. Become. At the same time, the impact member 17 also returns to its normal forward position due to the biasing force of the spring 16. In this way, by simply pushing the wire into the pressure contact terminal while holding the wire in the presser 7, the wire can be cut simultaneously when the wire is installed by using the pressing force at the time of installation.

When pushing a wire into a press-contact terminal, the tilted position of the operating member is reliably maintained due to the synergistic action of the coil spring with the eccentric small diameter part, the spherical surface at the rear end of the pusher, and the bump on the edge of the through-hole of the impact member. This will prevent malfunctions.

The cutter 6 in this embodiment is the cutter mounting tube 5.
It is constructed separately from the main body and is fixed and held in a removable manner.
This makes it possible to easily replace the cutter that has worn out due to repeated cutting of the wire.

An adjustment screw 22 is provided in an opening penetrating the housing 1 behind the spring 16 that presses and biases the impact member 17. By rotating this adjustment screw 22, the elastic force of the spring 16 can be adjusted to an appropriate strength. This makes it possible to create an appropriate cutting force depending on the wire diameter of the wire to be processed.

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

(a) Even when holding the elongated housing and working with a tool, the electric wire can be cut after being pushed in a straight line with a pusher without having to hit the electric wire with a cutter. In particular, there is an advantage that an appropriate cutting force can be selected depending on the diameter of the wire to be cut by force.

(b) When the impact member is retreated as the pushing force is pushed and the pushing amount reaches a certain amount, the inclination of the action member is corrected and the engagement between the action member and the impact member is released. An impact can be applied to the housing at the precise timing when the clip terminal is completely pushed into the terminal, and the extra length of the electric wire can be neatly cut off between the terminal base and the terminal base by the impact to the cutter.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the electric wire push-cutting jig according to the present invention, Figures 2 to 4 are side sectional views showing the operating principle of the same jig, and Figure 5 shows the case where an adjustment screw is provided. FIG. 2...Guiding member, 3...Shoulder, 6...Katsu,
7... Presser, 13... Action member, 17... Impact member, 18... Through hole, 22... Adjustment screw, c...
…Electrical wire.

Claims (1)

[Scope of utility model registration request] A grippable elongated housing has a cutter integrally protruding from its front and a spring adjustment screw at its rear end. an impact member having a through hole in the front; an action member that is in contact with the impact member and positioned in an inclined manner; and a pressing member that is urged forward of the housing when the action member comes into contact with the impact member and is arranged in parallel with the cutter. By pushing the pusher, the impact member is retracted via the action member, and when the push reaches a certain amount, the action member is inserted into the through hole, thereby separating the action member and the impact member. An electric wire push-cutting jig characterized by having a configuration in which engagement with a member is released.