JPH0723905Y2 - Strain relief structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the structure of a connector or a terminal block used in communication equipment, etc., and particularly accommodates a U-groove terminal for the purpose of solderless connection of loose wires. The present invention relates to a strain relief structure of a connector or a terminal block.

(Prior Art) Conventionally, this type of connector or terminal block is provided with a strain relief protruding from the housing on one side or both sides of the U-groove terminal, and is arranged on both sides of the connector or terminal block fixed on the pressure welding tool. A plurality of loose wires that have passed through the respective groove portions of the strain relief are collectively pressed by a crimping tool with a crimping tool by means of a wire aligner on the comb teeth.

FIGS. 3 (a) to 3 (d) exemplify a structure in which loose wires are pressure-welded to a connector having a conventional structure. FIG. 3 (a) is a top view, FIG. 3 (b) is a front view, and FIG. FIG. 3 is a side view, and FIG. 3 (d) is an exploded side view before pressure welding. Reference numeral 1 in the figure
Is a housing of a female connector composed of an insulator,
Reference numeral 2 is a female terminal that is press-fitted and locked in the housing 1, and has a contact spring 2a for elastically contacting a male terminal (not shown) on the fitting side, and a U-groove 2b for pressing the wire rod 3 on the connection side. Have Further, the housing 1 is provided with a strain relief-shaped protruding groove portion 1a capable of engaging the covering portion 3a of the wire rod 3 with the U-shaped groove portion 2b facing each other. FIG. 4 is a perspective view illustrating a structure of a wire arranging device in which a wire is made to correspond to a predetermined female terminal before performing the pressure welding work. The wire 3 is laid in a direction perpendicular to the housing 1 fixed to the wire aligner 5, and is passed through the partition of the wire-combing teeth 5a so that it is directly above the U groove 2b of the female terminal and the groove 1a of the strain relief. The wire rod 3 is arranged by pressing the presser plate 4 (Fig. 3 (d)) with the press tool and mounting it on the housing 1 to forcibly push down the convex portion 4b provided on the inner peripheral side of the presser plate 4. Therefore, the wire 3 is inserted into the U-groove 2b, the coating 3a of the wire 3 is removed, and the core wire of the wire 3 is simultaneously formed.
Only 3b is press-fitted into the U-groove portion 2b for mechanical and electrical connection. In addition, the holding plate 4 is pressed onto the housing 1 by a pressure welding tool.
4b provided on the inner peripheral side of the holding plate when it is mounted on
Has a structure to achieve the function of strain relief by forcibly inserting the covering portion 3a of the wire rod 3 into the groove portion 1a of the strain relief and pinching and locking the wire rod 3 near the U groove portion 2b. Immediately after press-fitting the housing 1 and the pressing plate 4, one end of the wire 3 is cut by a blade (not shown) built in the pressure welding tool. The holding plate 4 is fixed to the housing 1 by fitting the hooks 4a provided at the lower ends of both sides of the holding plate 4 and the protrusions 1c provided at the both ends of the housing 1 at the same time when the holding plate 4 is completely attached.

(Problems to be Solved by the Invention) The conventional strain relief structure described above requires a wire arranging device integrated with the pressure welding tool or divided, and in connecting a large number of connectors having the same number of terminals. Is effective, but when the number of terminals of the connector is large, the housing length inevitably differs, so it is necessary to prepare a wire arranging machine corresponding to the number of terminals, which hinders the work. When wires are connected with the same connector with a time interval, for example, when initial wiring is incorporated into the device and then additional wiring is made by adding or modifying the device, the connector should be removed from the device. It is difficult to remove and wire with a pressure welding tool, and there are various drawbacks such as having to wire the wire rod just above the U-groove portion visually while using the simple tool in the state where it is installed in the device. Was there.

An object of the present invention is to eliminate these drawbacks and to provide a strain relief structure capable of press-connecting a U-groove terminal and a wire rod in a connector or a terminal block accommodating a U-groove terminal without using a wire arranging device. To do.

(Means for Solving the Problems) A strain relief structure according to the present invention comprises a plurality of U-groove terminals, an insulating housing for accommodating the terminals, and a wire rod which is engaged with the housing to form the U-shaped wire. In a connector or terminal block composed of a holding plate to be pushed into a groove terminal, the connector is provided at a position which is provided apart from the position of each U groove terminal in the cable extension direction and faces the groove portion of each U groove terminal. A groove having a groove width is provided, and a wide groove portion for temporarily holding the cable before engaging with the U groove terminal is provided at a groove open end portion of the protrusion piece, and the groove of the wide groove portion is provided. The width dimension is set to a groove width dimension that can be temporarily held by slightly pressing the jacket portion of the cable, and the lower end step portion of the wide groove portion is set to the U-shaped portion.
It is positioned below the upper end of the groove portion of the groove terminal, and the pressing plate is engaged with the protrusions of the plurality of protruding pieces of the housing corresponding to the U-groove terminal and the protrusion of the housing side portion. And a hook that fits together is formed, and the tip of the projecting projection of the pressing plate has a narrow stepped tip shape so as to push the wire into the U-groove terminal.

(Embodiment) Hereinafter, the present invention will be described in detail with reference to the drawings.

1 (a) to (c) and FIGS. 2 (a) to (c) show an embodiment of the present invention. FIG. 1 (a) is a top view of a strain relief structure. Figure (b) is a front view,
FIG. 1 (c) is an exploded side view before pressure welding. 2 (a) is an enlarged top view of the strain relief portion of this embodiment, FIG. 2 (b) is its front view, and FIG. 2 (c) is its side view. In these figures, the above-mentioned FIG.
(D), parts which are the same as or correspond to those in FIG. 4 are shown with the same symbols. In FIGS. 1A to 1C, reference numeral 1 is a housing of a female connector made of an insulator, reference numeral 2 is a female terminal press-fitted and locked in the housing 1, and a fitting side A contact spring 2a for elastically contacting a male terminal (not shown), and a wire rod 3 for pressure contact connection on the connection side U
It has a groove 2b. 4 is a holding plate.

In FIGS. 2A to 2C, reference numeral 1'denotes a housing 1
Is a protruding piece integrally formed with the U-shaped groove of the female terminal 2.
2b has a groove 1a at a position facing the groove 2b.
The groove width open end has a groove portion 1b wider than the groove width of the groove portion 1a. When the wire rod 3 is pressure-welded, the wire rod 3 is first drawn in a direction perpendicular to the housing 1 with respect to the housing 1 arranged on the pressure welding tool, and the covering portion 3a of the wire rod 3 is inserted into the groove portion 1b to perform simple holding. At the same time, the wire rod 3 is arranged right above the U-groove portion 2b to perform the wire arranging. Next, as shown in FIG. 1 (c), the holding plate 4 is attached from above the housing 1 and the wire 3 and the pressing plate 4 is pressed by a pressure welding tool. The wire rod 3 is pushed down from the upper side to the lower side of the U groove portion 2b by forcibly pushing down the convex portion 4b. As shown in FIG. 1 (c), the projecting convex portion 4 has a narrow stepped projecting end shape. In this case, the covering portion 3a of the wire 3 descends the grooves 1b, 1a of the projecting piece 1'opposed to the U groove, the covering 3a is removed in the U groove 2b, and the core wire of the wire 3 is removed.
Only 3b is press-fitted into the U groove portion 2b, and mechanical and electrical connection is made. Further, the covering portion 3a pushed down by the groove portion 1a brings about a function of a reliable strain relief in the vicinity of the U groove portion 2b which is held in the groove portion in a sliding contact. Further, the pressing plate 4 is fixed to the housing 1 by fitting the hooks 4a provided at both ends of the pressing plate 4 and the projections 1c provided at both ends of the housing 1 when the mounting is completed. The groove portion 1b has a function of the straight-lined comb teeth 5a in the conventional structure, and has a step portion or an inclined portion having a groove width that is appropriately smaller than the outer diameter of the covering portion of the wire rod 3, so that U by pressure welding of the wire rod is formed. It is possible to peel and remove the covering portion 3a of the wire 3 in the groove 2b and directly and easily hold the groove 1b and the covering 3a of the wire 3 in the vicinity of the connector connection portion before the claw engagement. Even if the U-groove terminals are pressure-bonded to each terminal without collectively pressing the presser plate 4 with the pressure-bonding tool, a simple pressure-bonding tool (not shown) can be used easily and accurately.

(Effects of the Invention) As described in detail above, according to the structure of the present invention, the first
In addition, in a connector or terminal block accommodating a U-groove terminal, a wire rod can be pressure-welded to the U-groove terminal without the use of a wire arranging device, and a wire arranging device is not required for a pressure welding tool. Therefore, there is an advantage that it is possible to contribute to simplification of the pressure welding tool, and even if the connector or the terminal block has a number of terminals, one pressure welding tool can be easily used. Second,
Even when pressure contact work is required after the connector or terminal block is installed in the device, the holding plate 4 is removed from the housing 1 and the wire rod 3 is temporarily inserted into the groove portion 1a for simply holding the wire rod 3, Accurate pressure welding can be realized with a simple pressure welding tool. As described above, the strain relief structure according to the present invention exerts a great effect on the flexibility of use of the connector or the terminal block accommodating the U-groove terminal and the simplification of the pressure welding tool without using the wire arranging device.

The present invention is not limited to the structure of the above-described embodiment, and various changes and modifications can be made, and the present invention includes modifications by these.

[Brief description of drawings]

FIG. 1 (a) is a top view of a connector accommodating a U-groove terminal according to an embodiment of the present invention, FIG. 1 (b) is a front view of the connector shown in FIG. 1 (a), and FIG. 1 (c). ) Is an exploded side view of the connector according to the present invention before pressure welding of a wire rod, FIG. 2 (a) is an enlarged top view of a strain relief portion according to the present invention, and FIG. 2 (b) is a front view of FIG. 2 (a). Fig. 2 (c) is a side view of Fig. 2 (a), Fig. 3 (a) is a top view of a conventional U-groove terminal accommodating connector, and Fig. 3 (b) is Fig. 3 (a). Front view, FIG. 3 (c) is a side view of FIG. 3 (a), FIG. 3 (d) is an exploded side view of a conventional connector before wire welding, and FIG. 4 is a conventional U-groove terminal. It is a perspective view of a wire arranging device. DESCRIPTION OF SYMBOLS 1 ... Female connector housing, 1 '... Projection piece, 1a ... Groove part, 1b ... Wide groove part, 1c ... Protrusion part, 2 ... Female terminal, 2a ... Contact spring, 2b ... U groove part, 3 ... Wire rod, 3a ... Wire rod Cover of 3b
… Wire core wire, 4… Presser plate, 4a… Hook, 5… Strainer,
5a ... Aligning comb teeth.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Ando 3-9-11 Midoricho, Musashino-shi, Tokyo Inside Nippon Telegraph and Telephone Public Corporation Musashino Electro-Communications Research Laboratory (72) Inventor Shuichiro Inagaki 3--9 Midoricho, Musashino-shi, Tokyo No. 11 in the Nippon Telegraph and Telephone Public Corporation Musashino Electro-Communications Laboratory (56) Bibliography SHO 58-14678 (JP, U) ACT S56-129073 (JP, U) ACT 57-122674 (JP, U) ACT Kosho 55-13895 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A connector or terminal block comprising a plurality of U-groove terminals, an insulating housing for accommodating the terminals, and a retainer plate that engages with the housing and presses a wire into the U-groove terminal. A projection-shaped piece provided with a groove having an appropriate groove width at a position facing the groove portion of each U-groove terminal, the protrusion-shaped piece being provided separately from the position of each U-groove terminal in the cable extension direction, A wide groove portion for temporarily holding the cable before engaging the U-groove terminal is provided at the groove open end portion of the projecting piece, and the groove width dimension of the wide groove portion is slightly pressed on the jacket portion of the cable. The groove width dimension is such that it can be temporarily held, the lower end step portion of the wide groove portion is located below the upper end portion of the groove portion of the U-groove terminal, and the holding plate (4) is provided with grooves of the plurality of protruding pieces of the housing. And a protruding protrusion (4b) corresponding to the U-groove terminal , The projection portion of the housing side (1c)
And a hook (4a) which engages with the holding plate, and the tip of the projecting projection of the pressing plate has a narrow stepped tip shape so as to push the wire into the U-groove terminal. Strain relief structure.