JPH0210552B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tool for connecting electric wires to clip terminals used for horizontal wiring of electronic button telephones and the like.

(Prior Art) Tools for simply and quickly connecting a plurality of electric wires to a U-shaped clip-shaped terminal are widely used for horizontal wiring of various electronic devices, such as electronic button telephones. This tool has the function of pushing a covered wire into a clip terminal, breaking the covering at the U-shaped connection part to establish an electrical connection, and cutting off unnecessary portions of the wire once the connection is complete.

As a conventional tool of this kind, Utility Model No. 52-53977,
No. 53-14936, No. 55-43680, No. 59-20788, etc. have been proposed. These tools all include a pusher for pressing the electric wire into the U-shaped connection part,
A cutter for cutting the extra length of the wire by pressing it against the insulating base of the clip terminal is fixed in parallel. Among the above-mentioned tools, Utility Model Publication No. 59-20788 is equipped with a guide plate having a wide concave cutout on the end face between the presser and the cutter, and this guide plate is configured to be retractable when pressed. And the cutlet is fixed.

In any case, the cutter blade of each of the above-mentioned tools protrudes beyond the presser, and this state is illustrated in FIG. 7 of the drawings. In other words, the presser d and the cutter e are fixed in position in a side-by-side state, and the extra length of the electric wire c is
In order to cut c' by pressing it against the insulating base b of the clip terminal a, the cutting edge e' of the cutter e must protrude beyond the pressing end surface d' of the presser d. The amount of protrusion is set to be larger than at least the diameter of the electric wire.

When connecting the wire c, press the wire into the U-shaped groove a' of the terminal a using both the pusher d and the cutter e, and after the wire c contacts the terminal base b and the connection is completed, move the cutter further forward. to cut the wire.

(Problem to be solved by the invention) According to the above structure, the cutting edge e′ is the pressing end surface.
Since the mechanism protrudes beyond d', there is a drawback that the cutter blade edge e' must be used for pressing. As a result, firstly, Fig. 7 A, B
Since the electric wire c is bent in the axial direction by the amount of protrusion of the cutting edge e', it is not possible to connect the wire c in a straight line in the axial direction. Second, since the wire is press-fitted into the U-shaped groove a′ while being bent,
The pressing force against a′ was large, and the pressing work caused severe fatigue. Thirdly, since the cutter cutting edge e' has to bear most of the pressing force, it is subject to severe wear and has to be constantly replaced.

Further, as shown in FIG. 7D, the wire is sometimes cut with a margin in consideration of the deterioration of the mechanical properties of the extra length c'. In this case, a gap f is formed between the pusher d and the cutter e of the electric wire c, which maintains a cutting margin of the extra length c', so if the press-fitting load is large, the wire will be press-fitted into the U-shaped groove a'. There was an accident in which the electric wire c entered the gap f, resulting in a poor connection.

The present invention was developed in view of the above-mentioned circumstances, and an object of the present invention is to enable reliable connection to a clip terminal and to enable long-term use of the cutter without wear.

(Means for Solving the Problems) The electric wire connecting tool for clip terminals according to the present invention for achieving the above object is characterized in that a cutter is integrally provided on the front of the housing and a shoulder is provided in the middle of the housing. is formed, and inside the housing,
An impact member that is biased forward from the rear by a spring and has a through hole in the center, an action member that is engaged with the impact member, and an eccentric diameter-reduced part that is wound around the action member to form an inclined shape. A coil spring positioned at the front side of the housing and the pusher which is in contact with the action member and urged forward of the housing are slidably provided, and when the pusher is pressed, the impact member is retreated via the action member, When the amount of pushing reaches a certain amount, the action member moves linearly against the coil spring at the shoulder and engages the through hole, thereby disengaging the impact member. It has a pressure cutting mechanism that bounces back and applies an impact to the cutter in the housing.

(Operation) Touch the pusher to the wire and press it against the clip terminal. As the presser is pushed in, the impact member is moved back via the action member, which is maintained in an inclined position by the coil spring. When the push amount reaches a certain amount, the wire is connected to the clip terminal.
At the same time, inside the housing, the retracted working member comes into contact with the shoulder, and the inclination of the working member is corrected against the coil spring, so that it becomes straight. Along with this, the action member moves to the center of the impact member and engages in the through hole, 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 the accumulated force, and the impact is applied to the cutter integrated into the housing, resulting in the excess length of the wire being cut between it and the insulating base. .

(Embodiment of the Invention) Figures 1 to 4 show an embodiment of the pressing and cutting mechanism of the wire connecting tool for clip terminals according to the present invention, and Figure 1 shows a partially cutaway view of the main part of the mechanism. FIG. 2 is a sectional view showing the state before pressing, FIG. 3 is a sectional view showing the pressing process, FIG. 4 is a sectional view showing the cutting state, and FIGS. The figure is a sectional view showing an embodiment of a wire connecting tool for clip terminals that embodies a press cutting mechanism.

The clip terminal connection tool 1 is comprised of a presser 2 and a cutter 3 arranged in parallel so that they can move forward and backward. The above presser 2
In this case, pressing pieces 5, 5 are projected through the terminal allowing groove 4, and wire holding grooves 6, 6, which serve as wire pressing surfaces, are provided horizontally in the pressing pieces 5, 5, respectively. Further, since the cutting edge 7 of the cutter 3 is normally set back from the wire pressing surface of the pusher, the wire holding grooves 6, 6
It is installed flush with or set back from the groove surface.

According to the above electric wire connection tool 1 for clip terminals,
While applying the wire c to the U-shaped groove a' of the clip terminal a, the wire c is inserted into the wire holding grooves 6, 6 in the axial direction.
and set the pressure. In this state, the electric wire c is held linearly in the axial direction by the horizontally provided wire holding grooves 6, 6. Since the wire is pressed by the pair of wire holding grooves 6, 6, the U-shaped groove
Even if there is pressing resistance to a', it is pressed almost horizontally. When the pressing force of the pusher 2 reaches a certain level and the wire sheath is broken at the U-shaped groove a' and connected to the clip terminal a, the cutting edge 7 of the cutter e moves forward and cuts the wire between it and the insulating base b. Cut the extra length c′.

According to the above-mentioned mechanism, since the wire holding grooves 6, 6 press the clip terminal horizontally from both sides, the wire can be pressed and connected in a horizontal state, thereby providing a mechanism that can achieve a reliable connection.

The pusher 2 and cutter 3 in the extrusion cutting mechanism of the wire connection tool for clip terminals are shown in FIGS. 5 and 6.
This will be explained more specifically by applying it to the drawings.

A guide member 12 inside the grippable elongated housing 11 houses a pusher 2 which is biased forward by an action member 13, and a pusher 2 is biased forward by a spring 14 at the rear thereof. The impact member 15 is contained within the guide member 12 in a state where it is regulated by the shoulder portion 16 of the guide member 12. The operating member 13 is inserted into the coil spring 17 and has an eccentric reduced diameter portion 17a.
It is positioned in an inclined manner and is in pressure contact with the expanded diameter portion 18 of the presser 2. Further, a through hole 19 is bored along the axis of the impact member 17. Further, the cutter 3 is fixed to a guide member 12.

At the time of connection, when the housing 1 is pressed toward the insulating base b, the electric wire c is inserted into the U-shaped groove a' with the sheath cut open. As a reaction to this, the pusher 2 to the action member 13 move back against the biasing force of the coil spring 17, and the impact member 15 also moves back against the spring 14. When the housing 1 is further pressed toward the insulating base b, the posture of the circumferential slope 13a of the action member 13 is corrected by the inclined wall surface 16a of the shoulder 16 of the guide member 12, so that the push shaft 1 of the action member 13 is corrected.
3b is aligned with the through hole 19 of the impact member 15. As a result, when the impact member 15 is released from the restraint of the action member 13, it moves forward at once due to the elastic force of the spring 14 and collides with the shoulder 16, and the impact impact at this time causes the cutting edge 7 of the cutter 3 to become insulated. Cut off the extra length c' of the front line that is in contact with the base b.

As explained above, the present invention provides the following effects.

(b) Even when you hold the housing and work with a tool, you will not have to hit the wire with the cutter.
The wire can be cut by pushing it in a straight line with the pusher.

(b) As the impact member is pushed back and the amount of push reaches a certain amount, the shoulder part resists the coil spring and corrects the inclination of the action member, so the action member straightens its posture and corrects its posture. As a result, when the action member enters the through hole, the action member and the impact member are disengaged, and the impact member is applied to the cutter by the biasing accumulated force. .

(c) With the mechanism described in (b) above, it was possible to achieve synchronization of the cutter at the exact timing when the push into the clip terminal was completed.

[Brief explanation of drawings]

1 to 4 show an embodiment of the press cutting mechanism of the wire connection tool for clip terminals according to the present invention, FIG. 1 is a partially cutaway perspective view of the main part of the mechanism, and FIG. The figure is the same sectional view showing the state before pressing, FIG. 3 is the same sectional view showing the pressing process, FIG. 4 is the same sectional view showing the cutting state, and FIGS. 5 and 6 are the same sectional view showing the pressing cutting mechanism. A cross-sectional view showing an embodiment of a wire connection tool for clip terminals, FIGS. 7A, B,
C and D are cross-sectional views showing conventional press cutting states. 1...Wire connection tool for clip terminal, 2...Press element, 3...Cut, 6...Wire holding groove, 11...
... Housing, 12 ... Guide member, 13 ... Action member, 15 ... Impact member, a ... Clip terminal,
b...Insulated base, c...Electric wire.

Claims (1)

[Scope of Claims] 1. A pusher for press-connecting an electric wire to a substantially U-shaped clip terminal, and a cutter installed in parallel with the pusher for pressing and cutting the extra length of the wire against the insulating base of the clip terminal. In the electric wire connecting tool for clip terminals, the housing has the cutter integrally protruding from the front thereof, and a shoulder portion is formed in the middle of the housing, and the inside of the housing is biased forward from the rear of the housing. an impact member having a through hole in the center;
an action member that engages with the impact member; a coil spring that is wound around the action member and positions the action member in an inclined manner with an eccentric diameter-reduced portion; and a coil spring that is in contact with the action member and is biased forward. The pusher is slidably provided, and when the pusher is pushed in, the impact member is retracted via the action member, and when the push reaches a certain amount, it moves in a straight line at the shoulder against the coil spring. An electric wire connection for a clip terminal, characterized in that the member is disengaged from the impact member by engaging in the through hole, whereby the impact member rebounds and applies an impact to the cutter of the housing. Tool pressure cutting mechanism.