JPH0318734Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a temporary screw fixing device used for terminal devices and the like.

[Background technology]

A terminal device equipped with a conventional screw temporary fixing tool will be explained with reference to FIG. As shown in the figure, this terminal device consists of a terminal screw 1, a terminal plate 2, and a tightening washer 3.
and a screw temporary fixing tool 4, respectively. The terminal plate 2 has an insertion hole 2a into which the terminal screw 1 is inserted. The tightening washer 3 has a screw hole 3a into which the terminal screw 1 is screwed. The temporary screw fixing tool 4 has a plate made of an elastic material such as a spring material, and has an insertion hole 4a into which the tip of the terminal screw 1 is inserted. Support portions 4b are provided at the upper and lower edges of the insertion hole 4a to elastically hold the tip portion of the terminal screw 1 from two directions. In the figure, 5 is a body of an embedded outlet etc. in which a terminal device is installed, and this body 5
is provided with a groove 5a whose one end is open to the surface. A groove 6 extending in the vertical direction is provided on the opening side of both side walls of the groove 5a, and a groove 16 extending in the vertical direction is also provided in the depth thereof. Terminal board 2
is inserted into the groove 6 on both sides, and the screw temporary fixing tool 4 is inserted into the groove 6.
is inserted into the groove 16 on both sides, and the terminal plate 2 and the temporary screw fixing tool 4 are arranged with a gap between them. The tightening washer 3 is disposed in the groove 5a between the terminal plate 2 and the temporary screw fixing device 4, and is movable therebetween.

This terminal device is used in the following manner. That is, normally, the terminal screw 1 is inserted into the insertion hole 2a of the terminal board, screwed into the screw hole 3a of the tightening washer, and the tip portion is held between the protrusion 4b of the fixture 4 and temporarily fixed. When connecting wires by pressing,
The tip of the electric wire is inserted between the terminal plate 2 and the tightening washer 3 through the electric wire insertion hole provided in the body 5, the terminal screw 1 is tightened, and the tightening washer 3 is drawn toward the terminal plate 2. As mentioned above, if the tip of the screw 1 is temporarily fixed to the temporary fixture 4, when the wires are not connected,
Even if the tightening washer 3 is left separated from the terminal plate 2 without tightening the terminal screw 1, the terminal screw 1 will not come off due to vibration or the like. In this state, when connecting the terminal plate 2 and the tightening washer 3,
All you have to do is insert the electric wire between the two terminals and tighten the terminal screw 1. On the other hand, if there is no temporary fixing tool, there is a risk that the terminal screw 1 will come off due to vibration or the like and be lost unless the terminal screw 1 is tightened. However, if you leave the terminal screw 1 in a tightened state, when connecting, you must first loosen the terminal screw 1 and tighten the tightening washer 3.
must be separated from the terminal board 2, making the wiring operation complicated.

Conventional screw temporary fixing devices have the following problems. In other words, widening the gap (dimension of the screw biting part) a (see Figure 5) between both support parts makes it easier to insert the screw, but the spring force from the support parts becomes weaker, making it difficult to hold the screw. become certain. Therefore, in the past, the distance a was made small in order to ensure sufficient spring force of the support portion. but,
If this is done, the tip edge of the support part will not dig into the thread groove poorly, and will come to touch the screw beyond the thread, resulting in a problem that the screw will be held weakly and unreliably. Ta.

The inventors set the distance a small,
In an attempt to strongly and reliably hold the screw by improving the biting of the tip of the support part into the thread groove, various deformations of the support part were made as shown in FIGS. 6 to 12. In the screw temporary fixing device 7 shown in FIG. 6, the end portion of the support portion 7a is on the side where the screw is inserted (in the figure, the arrow indicates the screw insertion direction, and this also applies in FIGS. 7 to 9). ) is bent diagonally toward the opposite side. In the screw temporary fixing tool 8 shown in FIG. 7, the tip of the support portion 8a is bent into a dogleg shape so that the opening side faces the screw insertion side. In the screw temporary fixing device 9 shown in FIG. 8, the tip of the support portion 9a is bent obliquely toward the screw insertion side. In the screw temporary fixing device 10 shown in FIG. 9, the tip of the support portion 10a is bent into a dogleg shape so that the opening side faces the side opposite to the screw insertion side. The screw temporary fixing tool 11 shown in FIG.
1b is provided. The temporary screw fixing tool 12 shown in FIG. 11 has a semicircular notch 12b at the tip of a support portion 12a. The temporary screw fixing tool 13 shown in FIG. 12 has a substantially U-shaped notch 13b at the tip of the support portion 13a. In FIGS. 6 to 12, reference numeral 17 indicates a screw insertion hole.

However, in the temporary screw fixing devices shown in FIGS. 6 to 12, the distal end of the support part did not bite into the thread groove very well, and the screws were not held very strongly.

[Purpose of invention]

This invention was made in view of the above circumstances, and an object of the present invention is to provide a temporary screw fixing tool that can strongly and reliably hold screws.

[Disclosure of invention]

In order to achieve the above object, this invention includes an insertion hole through which the tip of the screw is passed, and the tip of the screw passed through the insertion hole is
It is a temporary screw fixing device that is equipped with a plate-shaped support part on the edge of the insertion hole that elastically clamps from the direction, and the tip part of the support part is fixed on one side so that the straight tip edge follows the slope of the screw thread. The insertion hole is bent along a diagonal line from the tip edge toward the other side, and the insertion hole has a notch on the edge on the side other than the clamping direction to allow the screw to hit. Furthermore, at both ends of the screw temporary fixing device,
The gist of the present invention is a temporary screw fixing device characterized in that an insertion groove into which the temporary screw fixing device is attached is provided with three protrusions each, the tips of which are pressed against each other.

This idea will be explained in detail below.

FIGS. 1 and 2 show a screw temporary fixing device according to this invention. This screw temporary fixing tool 14 is
It is made of an elastic plate material such as a spring, and has an insertion hole 14a through which a terminal screw is passed. Bent parts 14b are provided on both sides of the temporary fixing tool 14, and protrusions 15 for temporary fixing are provided at the tips of both bent parts 14b.
There are three each. At the remaining upper and lower edges of the temporary fixture 14 where the bent portion 14b is not provided, a deformation prevention protruding piece 14c bent into a hook shape is provided. At the upper and lower edges of the insertion hole 14a,
A plate-shaped support portion 14d is provided that elastically holds the tip of the terminal screw. The tip of the support portion 14d has a straight tip edge, and the screw is inserted along a diagonal line from the tip of one side toward the base position from the tip of the other side, so that the tip edge forms a straight line and follows the slope of the thread of the terminal screw. It is folded to the opposite side from the side being touched.
In FIG. 2, the arrow indicates the direction of insertion of the terminal screw. The degree of bending of the tip portion of the support portion 14d is determined by the third
As shown in the figure, the deviation angle b of the tip edge of the support portion 14a with respect to a plane orthogonal to the axis of the screw 1 when viewed from the vertical direction is
It is best to make it slightly larger (deeper) than the angle (lead angle) c. For example, if the angle c is
In the case of 5°, angle b should be approximately 8°30'. Also, in this case, the angle d shown in FIG.
The angle should be around 17°. Notches 14e are provided on both edges of the insertion hole 14a in the non-clamping direction to allow contact with the terminal screw to escape.

The temporary screw fixing device according to this invention can be used for temporarily fixing terminal screws in the same manner as conventional ones. That is, as shown in Figure 4,
Arrange the tightening washer 3 so that it is movable between the terminal plate 2 and the screw temporary fixing tool 14, pass the tip of the screw 1 through the insertion hole 2a and the screw hole 3a, and then insert the screw 1 into the insertion hole 1.
4a and held by the support portion 14d.

The screw temporary fixing device according to this invention has a support part 14
Since the tip portion d is bent as described above, the tip edge of the support portion can easily bite into the thread groove when inserting the terminal screw. In addition, the tip edge of the support part bites into the thread groove after insertion, and the spring action of the support part is applied to the terminal screw sufficiently, so that the terminal screw is strongly held and temporary fixation is ensured. . In addition, when the conventional screw temporary fixing device tightens the terminal screw,
There were cases where the tip edge of the support part slipped and came off the screw thread, weakening the ability to hold the terminal screw, but with this temporary screw fixing device, it supports the screw thread like a claw. Since the tip edge of the support part touches, there is almost no risk of the tip edge of the support part slipping.

In addition, in the above embodiment, since projections for temporary fixing are provided on both sides, both sides of the screw temporary fixing tool are
When inserted into a groove 16 as shown in FIG. 1 and temporarily fixed, the protrusion comes into pressure contact with the wall of the groove. Therefore, there is almost no possibility that the screw temporary fixing tool will come off from the groove. Since a plurality of protrusions are provided on one side, rattling of the screw temporary fixing tool is eliminated. On the other hand, if there is only one protrusion, there is a risk that the screw temporary fixing tool will wobble. When the looseness of the screw temporary fixing device is eliminated, the distal end edge of the support portion can be reliably bitten into the screw. If a protrusion is provided, 1
It is best to have three on each side. In addition, since the above-mentioned embodiment is provided with a notch for screw release, even if the tip of the screw shifts in a direction where it is not held by the support part, it will not hit the edge of the insertion hole of the temporary screw fixing tool. There is little risk of deformation of the screw temporary fixing tool. Therefore, there is little risk that the holding of the screw will weaken due to deformation of the temporary screw fixing tool. moreover,
As in the previous embodiment, bent portions bent at angles other than right angles are provided on both sides, and as shown in FIG. Bevel 1 with an angle that meets the outer surface of the fold when the fixture is inserted
6a eliminates the possibility of inserting the screw temporary fixing tool upside down when inserting it into the groove. However, it is not always necessary to provide such a bent portion. The temporary screw fixing tool according to this invention is not only used for temporarily fixing terminal screws, but can also be used for temporarily fixing (preventing falling off) other screws such as assembly screws.

[Effect of idea]

The screw temporary fixing device according to this invention has an insertion hole through which the tip of the screw is passed, and a plate-shaped support that elastically clamps the tip of the screw passed through the insertion hole from two directions. This is a temporary screw fixing device that is provided on the edge of the insertion hole, and the screw is inserted into the tip of the support part along a diagonal line from one tip edge to the other side so that the tip edge follows the inclination of the thread. Since it is bent toward the opposite side, the screw can be held firmly and reliably.

Furthermore, since the insertion hole is provided with the notch as described above, the tip of the screw does not come into contact with the edge of the insertion hole other than the support portion. With this device, the tip of the screw can move to some extent in a direction parallel to the linear tip edge of the support, so if there is no notch, the tip of the screw would hit the edge of the insertion hole. This causes problems such as the temporary screw fixing device being deformed and the screw threads being crushed. However, if there is a notch, there is no need to worry about the tip of the screw hitting the insertion hole.

Further, since three protrusions are provided on both ends of the temporary screw fixing device, when the temporary screw fixing device is inserted into the insertion groove for installation, it can be reliably installed accurately without rattling. When the support part is bent to match the inclination of the screw thread as in this invention, if the mounting position of the temporary screw fixing tool and the screw is tilted, the screw thread and the support part will not engage accurately. If you attach the screw temporary fixing tool with the three protrusions pressed against the insertion groove and positioned accurately, and then insert the screw there, the inclination of the thread and the support part will match exactly. , it can be inserted smoothly and reliably.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the screw temporary fixing device according to this invention, and FIG. 2 is an A--A in FIG.
A sectional view taken along line A', FIG. 3 is an explanatory diagram of the bending angle of the tip of the support portion of the above embodiment, FIG. 4 is an explanatory diagram of the same embodiment used in a terminal device, and FIG. 5 1 is an explanatory diagram of the configuration of a terminal device using a conventional screw temporary fixing device, and FIGS. 6 to 12 are explanatory diagrams of modified examples of the support portion of the screw temporary fixing device. 14...Screw temporary fixing tool, 14a...Insertion hole, 1
4d...Support part.

Claims (1)

[Scope of utility model registration request] A screw temporary is provided with an insertion hole through which the tip of the screw is passed, and a plate-shaped support part on the edge of the insertion hole that elastically holds the tip of the screw passed through the insertion hole from two directions. In the fixing device, the tip of the support part is oriented toward the side opposite to the side where the screw is inserted along a diagonal line from one tip edge to the other side so that the straight tip edge follows the slope of the thread. The insertion hole is provided with a notch on the edge on the side other than the clamping direction to allow the screw to come into contact with it, and furthermore, on both ends of the temporary screw fixing device,
A temporary screw fixing device characterized in that an insertion groove into which the temporary screw fixing device is attached is provided with three protrusions each for pressing the tips of the insertion grooves.