JPS62141304A - Falling preventive method of set screw - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] Devices, units, etc. are installed by forcibly threading a washer with an incompletely threaded portion onto the neck of the set screw, so that the set screw reconnects with the threaded portion of the washer. This prevents the set screw from falling off the device, unit, etc.

[Industrial application field]

The present invention relates to a method for preventing a set screw from detachably attaching a device, unit, etc., from falling off.

For example, as shown in the side view of FIG.
L brackets 2 for mounting are fixed on the top and bottom of the rack, etc.
It is removably attached to the screw hole 4 with a set screw 6 via a washer 5.

When the above-mentioned unit (1) is not attached to the rack 3, the set screw 6 is inserted into the hole (not shown) of the L fitting 2 and is not separated.

That is, it is preferable that it does not fall off, and for this purpose the washer 5 is inserted.

[Conventional technology]

In the side cross-sections of FIGS. 4 and 5, only g['] of the conventional set screw falling-off prevention means is shown. Units) 1. L bracket 2, rack 3
is omitted.

The set screw 6 has a neck portion 9 formed between a tip threaded portion 7 and a head 8, the neck portion 9 having a smaller diameter than the outer diameter of the tip threaded portion 7.

The washer 5 has a recess 10 into which the threaded part 7 can fully fit, and a screw hole 11 into which the threaded part 7 can easily pass without resistance on the head 8 side. This screw hole 11 is located in the neck 9 and is necessary to minimize the deviation between the center of the set screw 6 and the center of the washer 5.

Furthermore, in FIG. 4, a well-known O-ring 12 made of a protective film is fitted to the neck portion 9, but this is because the threaded portion 7 and the screw hole 11 may naturally come together due to vibrations during transportation of the unit l. This is to prevent both from falling out of the unit 1 by screwing together and passing through.

In Fig. 5, the neck 9 has a slot (
A circular leaf spring (not shown) or a well-known E-shaped ring 13 is attached, which is exactly the same as the 0'J ring 12 described above.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional configuration, a separate part is required to prevent falling off. Moreover, for this reason, the washer has a large diameter and is also long.

[Means for solving problems]

An object of the present invention to solve the above-mentioned problems of the prior art is to provide a device, which has a neck portion with a smaller diameter than the outer diameter of the distal end screw portion and the head portion between the distal end threaded portion and the head. Insert the setscrew that removably attaches the unit, etc., into the hole for attaching the device, unit, etc., and then screw in the threaded washer that has a screw hole into which the tip thread part can be screwed. An incompletely threaded portion is formed at the end of the threaded hole through which the threaded end passes, and the incompletely threaded portion is forcibly passed through the threaded end so that the neck is in the busy position. This is achieved by a unique method of preventing setscrews from falling off.

[Effect]

According to the above-mentioned means of the present invention, the incompletely threaded portion formed in the shape of a seat is forcibly passed through the neck of the set screw, so that the incompletely threaded portion can be easily prevented by the elastic source provided after passing through. It can again be screwed into the back of the tip threaded portion, thus preventing the set screw from falling off.

〔Example〕

An embodiment of the method of the present invention will be described below with reference to side cross-sections of main parts shown in FIGS. 1 and 2.

Note that this embodiment can also be applied to, for example, FIG. 3, and in this case, the
are omitted, and parts that are the same as those in the prior art are denoted by the same reference numerals, and their explanation will be omitted.

FIG. 2 shows the washer 20. On the left side of the drawing, there is a recess 21 that is large enough for the tip threaded portion 7 of the set screw 6 to enter, and on the right side, a screw hole 22 is formed with an N center.

The threaded hole 22 is a threaded part 24 on the end surface 23 side that can be easily screwed in, and the tip threaded part 7 on the end surface 25 side of the recess 21 is an incomplete screw that can be forcefully screwed in. Approximately one peak of the portion 26 is formed.

Now, with reference to FIG. 3, the setscrew 6 is inserted, and the end threaded portion 7 is inserted into the not-illustrated hole of the L fitting 2 of l. Next, the threaded hole 22 of the washer 20 is made to face the tip threaded portion 7, and the threaded portion 24 is screwed into the screw hole 22 of the washer 20. In this state, the opening can be easily made deaf, but since the incomplete threaded portion 26 is reached and cannot be easily screwed in, a suitable tool (not shown) is used.
With the washer 20 held in the mouth so that it does not rotate, the head 8 is rotated using an air driver or the like (not shown) to force it to pass through. This state is shown in Figure 1.

The screw hole 22 is located in the neck portion 9, and the incompletely threaded portion 26 is formed into a tight screw shape by the tip screw portion 7, and after passing through, it returns to its original state due to elasticity, albeit slightly. Therefore, the passage #27 of the tip threaded portion 7 cannot be easily screwed together.

As described above, the set screw 6 and washer 20 are prevented from naturally deviating from the L fitting 2 of the unit 1 due to vibrations, etc., and are prevented from falling off or being lost. If the washer is made of a steel-based metal material, the washer is a porcelain alloy or aluminum alloy, and if the set screw is made of brass, the washer is an aluminum alloy. It is preferable because there is less damage and deformation of the parts. It is also advantageous for the outer shape of the washer and the screw head to be not circular, but for example hexagonal, octagonal or other polygonal.

〔Effect of the invention〕

As described above, the method of the present invention is extremely practical, requiring no additional parts and requiring only the minimum necessary washer.

[Brief explanation of drawings]

FIG. 1 is a side cross-section of a main part of an embodiment according to the method of the present invention, FIG. 2 is a side cross-section of only the washer shown in FIG. 1, FIG. 3 is a side view of the unit installed, and FIGS. Each figure shows a side cross section of a conventional main part. In the figure, 1 is the unit, 2 is the L bracket, 6 is the set screw, 20
is a washer. 71 Invention of the present invention 1 arrow direction t4 column year 1 eye 1 figure/1 Maro Kincho? To the concave J knit and nursing forest, J1 vomit l xiangji mo5 fig.

Claims (1)

[Claims] The device, unit, etc. (1) has a neck portion (9) with a smaller diameter than the outer diameter of the tip threaded portion between the tip threaded portion (7) and the head (8). Insert the set screw (6), which is removably attached, into the mounting hole of the device, unit, etc. (1), and then insert the screw hole (2) into which the tip threaded portion (7) can be screwed.
2) into which the threaded washer (20) having an incompletely threaded portion (26) is inserted.
is formed, and the incompletely threaded portion (26) is forcibly screwed through the tip threaded portion (7) to be located in the neck portion (9). How to prevent falling off.