JPH01155687A - coupling device - 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 [Field of Industrial Application] The present invention relates to a joining device for joining parts, and in particular to a joining device using screws.

[Conventional technology]

Conventional coupling devices provide screw holes in objects to be fixed such as & lids,
- In 10,000, a female threaded portion was formed into which a screw was screwed into a fixed body such as a front frame, and a washer was attached to the screw to prevent the screw from falling off, and the washer was screwed to the fixed body. Then, a screw is inserted into the female threaded portion of the fixed body through the screw hole of the fixed body to couple the two. Incidentally, as related to this type of device, there is cited Japanese Utility Model Application No. 57-61881. According to the above-mentioned conventional coupling device, since the screw is attached to the washer, when the screw becomes loose, Even if the screw falls off, it connects to the washer and prevents the powder from being lost.

[Problem that the invention seeks to solve]

However, as described above, in the conventional method, in addition to the coupling structure, a washer for preventing the screw from falling off is required, which causes problems such as poor assembly workability and high cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to provide a coupling device that does not require a washer as in the prior art, has good assembly workability, is inexpensive, and can reliably prevent screws from falling off.

[Means for solving problems]

In order to achieve the above object, the present invention provides a combination comprising a fixed body having a female thread forming part and a fixed body tightened to the fixed body by a screw screwed into the female thread forming part. In the device, an elastic rib portion is provided protruding from the screw tightening portion of the fixed body, and when the screw is loosened, the screw comes into contact with the rib and is prevented from coming off.

[Effect]

Since the coupling device of the present invention has a Km configuration as described above, the rib provided on the screw tightening portion of the fixed object is pushed outward against the elastic force by the screw head when the screw is tightened. A screw is further screwed in to connect the fixed body to the fixed body. Then, the rib, which had been pushed outward, returns to its original position due to its own restoring force, and the rib is positioned on the thread of the screw, so even if the screw loosens, the screw head will not come into contact with the rib. Prevents stoppers and screws from falling off.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the coupling device according to the present invention, and is a sectional view showing the coupled state, in which 1 is a front frame, 2 is a boss, 3 is a back cover, 4 is a screw tightening part, and 5 is a screw. , 6 is a screw head, and 7 is a rib.

FIG. 2 is a sectional view showing the state in which the screws are loosened, and the first
Parts corresponding to the figures are given the same reference numerals.

In the embodiments shown in these figures, the fixed body, for example the front frame IK, and the internal thread forming part, for example the boss 2, are integrally formed. This boss 2 is formed with a round hole 2a having a diameter smaller than the diameter of a screw described later, and by screwing a screw into this round hole 2a, a female thread is formed on the inner peripheral surface of the round hole 2a.

3 is an object to be fixed, for example, a back cover, and a screw tightening part 4 is integrally formed on the back cover 3. ◇This screw tightening part 4 has a cylindrical shape with a bottom, and a screw 5 is attached to the bottom of the screw tightening part 4. A round hole 4a is formed into which it is inserted. Further, a plurality of slits 4b are formed in the peripheral wall of the screw tightening portion 4, and elastic ribs 7 that are constricted inward from the back cover 3 are formed in the slits 4b. The distance between the tips of these ribs 7 is set smaller than the diameter of the screw head 6 of the screw 5, and the distance between the tip of the rib 7 and the bottom of the rib 7 is set shorter (than the length of the screw 5). There is.

41 like this! The effects achieved in the above embodiment are as follows.

First, when the screw 5 is inserted into the screw tightening part 4 from the right side in FIG. 1, the screw head 6 comes into contact with a rib 7 that projects inward.

Furthermore, when the screw 5 is inserted, the rib 7 is caused by the screw head 6.
The tip of the screw is pushed outward and overcomes the rib 7. As shown in Fig. 2, the rib 7 returns to its original state due to its own elastic force, and the space between the ribs 7 is set to be smaller than the diameter of the screw head 6. The tip of the rib 7 contacts the screw head 6 to prevent the screw 5 from coming off. When the screw 5 is screwed into the boss 2, the screw 5 is fastened to the boss 2 while a female thread is formed in the round hole 2a of the boss 2, and the back cover 3 is coupled to the front frame 1.

When the back cover 3 is removed from the front frame 1 or when the screw 5 becomes loose, the screw head 6 of the screw 5 comes into contact with the tip of the rib 7 to prevent it from coming off, as shown in FIG. It is possible to prevent the screw 5 from falling off.

In the above-described embodiment configured in this way, even if the screw 5 loosens after being tightened, the screw head 6 comes into contact with the tip of the rib 7 and is prevented from coming off, so that the screw 5 is prevented from falling off. It can be prevented. Furthermore, since no separate component for preventing screws from falling off is required, assembly workability is improved and economical.

〔Effect of the invention〕

As explained above, according to the present invention, since the elastic rib is provided protrudingly on the screw tightening part, even if the screw loosens after tightening, the screw can be prevented from falling off. Since no parts are required, assembly work efficiency is improved and it is economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part showing an embodiment of the coupling device according to the present invention, showing the state after the screw is tightened, and FIG. 2 is a sectional view of the main part showing the state in which the same screw is loosened. 1...Front frame, 2...Boss, 6...Back cover, 4...
Screw tightening part, 5...screw, 6...screw head, 7...
·rib. Agent: Patent Attorney Katsuo Ogawa'”2I

Claims (1)

[Claims] 1. In a coupling device comprising a fixed body having a female thread forming part and a fixed body tightened to the fixed body by a screw screwed into the female thread forming part, the screw tightening part of the fixed body is A coupling device characterized in that a rib having elasticity is provided in a protruding manner so that when the screw is loosened, the screw comes into contact with the rib and is prevented from coming off.