JPS6358017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for regulating the wire gripping force of a boltless spacer.

In recent years, boltless spacers equipped with wire gripping portions or clamps having coil springs have become widely used. The clamp portion of such a boltless spacer is required to have an appropriate wire gripping force. Therefore, if the wire gripping force is insufficient, it will not be able to cope with deformation of the wire due to creep, knicking, etc., and the function of holding the wire, which is the purpose of our office, will be insufficient, and if the gripping force is too large, the wire may be damaged. Doing so may cause accidents such as damage or breakage. Therefore, in a boltless spacer using a coil spring, it is necessary to regulate the tightening force of the spring. In particular, it is difficult to ensure the minimum necessary tightening force for the coil spring, and it is inevitable that the holding force, that is, the tightening force, will become excessive.

Therefore, an object of the present invention is to provide the coil spring with an initial initial force so as to deflect the coil spring with a predetermined repulsive force necessary for gripping the electric wire and to ensure the minimum required tightening force of the clamp after the clamp is assembled. To provide a method for regulating the wire gripping force of a boltless spacer by tightening a nut until it hits a spring washer while applying the minimum tightening load required by design.

Other objects, features and advantages of the present invention will become apparent from the detailed description below, taken in conjunction with the accompanying drawings.

An example of implementing the method of regulating the wire gripping force of a boltless spacer according to the present invention is shown in the drawings. 1st
As shown in the figure, the illustrated spacer has one end hingedly connected to a clamp body 1 by a pin 11 at one end, and the other end of a clamping body 2 is fixed under tension by a coil spring 6. Clamp body 1
A U-shaped frame 3 is integrally formed with the clamp body 1, and a T-bolt-shaped steel rod 5 whose head can be hooked onto the clamping body 2 is projected into the frame 3 through the hole 4 of the clamp body 1. and install a coil spring 6 around it,
One end of the coil spring 6 is brought into contact with the clamp body 1,
A spring washer 8 is disposed on the other end, supported by a nut 7, and the tip of a bolt 15 screwed onto the frame 3 is engaged with the end of the steel rod 5 for the coil spring 6 to compress the coil spring 6. It is configured to grip the electric wire W with force.

In the spacer having such a configuration, in order to regulate the coil spring 6 to a constant precompression load, the electric wire W or the gauge is inserted into the electric wire receiving grooves 12, 14 of the clamp body 1 and the clamping body 2, as shown in FIG. The head of the T-bolt-shaped steel rod 5 is supported by the support tool 21, and the coil spring 6 is attached to the spring washer 8.
A constant compression load P is applied by the pressing tool 22 via the compression tool 22 to compress the material. This load P is the minimum tightening load required in the initial design, and it is preferable to keep the load error small.

After applying the necessary initial load in this way, the second
As shown in the figure, a nut 7 is screwed onto the end of the steel rod 5 and tightened until it hits the spring washer 8. Natsuto 7
Once the nut 7 is screwed onto the steel rod 5 and tightened, it is preferable to secure the nut 7 to the steel rod 5 by appropriate means as necessary. Further, it is preferable to use a grooved nut for such a nut 7, caulk the grooved portion, and then secure the nut 7 by brazing it with solder.

Next, as shown in FIG. 3, screw the bolt 15 into the screw hole 16 of the frame 3 of the clamp body 1, and tighten the bolt 15 until it hits the seat at the end of the steel rod 5.
Tighten 5. Once the bolts 15 have been installed, the steel rod 5 is twisted approximately 90 degrees to complete the assembly.

By assembling the spacer with the coil spring of the spacer being regulated to a constant initial minimum tightening load, stable tightening force can be obtained regardless of the presence or absence of dimensional errors in each part of the spacer. Furthermore, the mounting gap is stable and does not generate excessive force. In other words, in order to ensure the minimum required tightening force of the coil spring at the clamp part of the spacer, the coil spring is compressed and fixed with the minimum tightening load required in the initial design during assembly, so each individual All errors and variations in parts can be absorbed, and the wire gripping force of the spacer can be regulated to a predetermined value.

Fig. 4 shows one example of fixing a spring washer at the tip of a steel rod for a coil spring. The spring washer 8' can be fixed at a required tightening load position by caulking the tip as shown.
Of course, instead of crimping the tip of the steel rod directly against the spring washer, the tip of the steel rod can also be crimped through a ring having a similar counterbore.

FIG. 5 shows an example in which the regulating method of the present invention is applied to a multi-conductor spacer using a pair of coil springs, and as in the previous embodiment, first the steel rod 33 of the coil spring 32 is The extension part 34 is supported by the tool 2
1' and a pair of coil springs 32.
are compressed by applying a constant compression load P by a pressing tool 32' via a common spring washer 35. Once the initial load has been applied in this way, the spring washer 35 is fixed in place using a double nut 36 at the tip of the steel rod 33, and the pair of coil springs 32 are compressed to the required tightening force. I can do it. Further, the spring washer can be fixed to the tip of the steel rod by caulking a grooved nut as described above, or by caulking the tip of the steel rod to the spring washer or a double nut.

[Brief explanation of drawings]

FIGS. 1 to 3 are diagrams showing a boltless spacer step by step in several steps for carrying out the method of regulating the wire gripping force according to the present invention, and FIG. 4 is a partial cross-sectional view showing an example of fixing a spring washer. , FIG. 5 is a diagram showing an example of another spacer implementing the regulating method of the present invention. In the figure, 1... Clamp body, 2... Tightening body,
3... Frame body, 4... Hole, 5, 5'... Steel bar, 6...
... Coil spring, 7 ... Nut, 8, 8' ... Spring washer, 15 ... Nut, 21, 21' ... Support tool, 22, 22' ... Pressing tool, 32 ... Coil spring, 33 ... Steel rod, 35...spring washer.

Claims (1)

[Claims] 1. Grip the electric wire or gauge with the clamp of the boltless spacer, support one end of the steel rod for the coil spring with a support tool, and use the tool to press the coil spring via the spring washer at the other end. Add a constant load to
A method for regulating the wire gripping force of a boltless spacer, which comprises fixing a spring washer to the other end of the steel rod in this pressed state. 2. A wire gripping boltless spacer according to claim 1, wherein the load applied to press the coil spring is equal to the minimum tightening load of the coil spring required in the initial design. How to regulate power. 3. While pressing the coil spring under a constant load through the spring washer, screw the nut onto the end of the steel bar and tighten it until it hits the spring washer. After tightening, tighten the nut so that it is fixed in that position. A method for regulating the wire gripping force of a boltless spacer according to claim 1, characterized in that: