JPH083980Y2 - Blind cap connection structure for connection terminals - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to an electronic device that is attached in a hanging manner to a messenger wire stretched in the air in a joint reception system, and projects outward from the case. The present invention relates to a connection stop structure for connecting a base end of a screw part of a measuring instrument connection terminal provided and an open end side of a cup-shaped screw-type blind cap via a ball chain.

(B) Prior art In a joint reception system, electronic equipment must be regularly inspected and, if trouble occurs, the operating condition must be checked.

Therefore, in such electronic devices, a measuring instrument connection terminal is usually provided at the bottom of the case so that the operation can be checked in the operating state, and a metallic screw-type blind cap is detachably attached to the measuring instrument connection terminal. Is equipped with.

Conventionally, the blind cap is fixed by, for example, a ball chain so as not to separate when removed.

As the connection stop structure, for example, the structures described in JP-B-55-53951 and JP-B-56-54580 are known.

(C) Problems to be solved by the invention In the conventional connecting structure described above, the workability is not good because the connecting sequence is such that the blind cap is connected to the connecting terminal and then the connecting terminal is assembled. Or, when the set of blind caps including the connecting member was replaced, it could only be removed after removing the connection terminal.

Further, as described in, for example, JP-B-43-22519, JP-B-45-4135, JP-B-52-161288, and JP-A-55-130082, the ball chain is assembled after the connecting terminals are assembled to the case. There is also known a structure in which the base end of is screwed to a case, but it is necessary to provide a screw hole in the case and there is a drawback that it is easily detached.

D means for solving the problem The present invention was created in view of the above-mentioned conventional drawbacks,
The structure is that the packing is fitted to the inner bottom surface of the blind cap, and the groove formed around the open end of the blind cap has
An eggplant-shaped connecting piece with a claw that has a fitting hole in which the elastic claw was cut and raised on the inner circumference was fitted, while the screwless part at the base end of the screw part of the measuring instrument connection terminal matched the screw groove. The eggplant-shaped connecting piece without a claw having a fitting hole is fitted, and the eggplant-shaped connecting piece without a claw and the eggplant-shaped connecting piece with a claw are a ball chain, and are connected at each end of the ball chain. The rods are connected to each other by inserting the rods into the slits formed by cutting from the respective fitting holes of the eggplant-shaped connecting piece without a claw and the eggplant-shaped connecting piece with a claw to the tapered side and locking them with a ball. An eggplant-shaped connecting piece has a connection structure of a blind cap for a connecting terminal, which is capable of being rotated and fed between the screw tip of the measuring instrument connecting terminal and the non-threaded portion.

E action A hookless eggplant-shaped connecting piece with a fitting hole that matches the thread groove can be fed between the tip of the screw part and the unthreaded part, so that it can be screwed to the connection terminal after assembly. The part can be rotated and fed to fit the part without screws to fix it, or it can be removed.

On the other hand, the eggplant-shaped connecting piece with the claws allows the elastic claws to be cut and raised, so that the claws can be smoothly rotated and prevented from falling off, and the twisting of the ball chain can be prevented.

In addition, the eggplant-shaped connecting piece without claws and the eggplant-shaped connecting piece with claws are
By inserting the connecting rods of the ball chains into the slits respectively, the balls are locked with one touch.

F. Embodiment An embodiment of the blind cap according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 accommodates a backbone amplifier circuit inside,
An aluminum die-cast case hermetically sealed with a lid, an input terminal 2 is provided on one side and an output terminal 3 is provided on the other side, and coaxial cables 4 and 4 are provided with connectors 5 and 5, respectively. It is designed to be connected via.

Further, on the upper surface, a wire connecting portion 6 for sandwiching and fixing the messenger wire 7 by tightening bolts 6a is formed, and is attached in a suspended manner to the messenger wire 7 stretched in the air as shown in the drawing.

Further, a threaded portion 8 of an F-type connector, which is a measuring instrument connecting terminal, is projected on the lower surface, the base end of the threaded portion 8 is screwless, and a blind cap 9 is attached to the tip side.

The blind cap 9 has a cup-like shape, a thread 10 corresponding to the threaded portion of the F-type connector is engraved on the inner peripheral surface, and the outer periphery is knurled to prevent slipping.

The blind cap 9 is made of a material having good conductivity, such as brass, to prevent radio waves from leaking from the terminals. Further, a rubber packing 11 is fitted on the inner lower surface to enhance waterproofness. There is.

At the opening edge of the blind cap 9, an edge 12 having a diameter slightly smaller than the outer circumference of the cap and a groove 13 adjacent to the edge 12 are circumferentially provided. An eggplant-shaped connecting piece 16 with a claw formed by punching out circular fitting holes 15 in which elastic claws 14, 14 ... Are protrudingly formed at four locations on the inside, and the fitting holes 15 are recessed from the opening edge 12 side. It is fitted by being pushed into the groove 13.

The eggplant-shaped connecting piece 16 with the claw is a thin plate having a slight elasticity. In the embodiment, it is made of stainless steel having a thickness of 0.3 mm, but other weatherproof polypropylene, ABS, or polycarbonate resin may be used.

The tip of the end edge portion 12 is formed into a tapered surface to facilitate the pushing operation of the connecting piece 16, and the elastic claws 14, 14, ... Are cut and raised on one side of the connecting piece 16,
For that reason, it is easy to fit along the taper of the edge portion, a clearance of 0.2 mm to 0.4 mm is generated between the groove 13 and the groove, and it rotates smoothly, and once fitted, the elastic claw 14,
14 ··· is difficult to come off because it is caught by the step formed at the boundary between the concave groove 13 and the end edge portion 12.

In this way, the eggplant-shaped connecting piece 16 with the claws has elastic claws 14, 14 ...
・ By cutting and raising, smooth rotation and prevention of falling are achieved (Fig. 3).

Further, the eggplant-shaped connecting piece 16 with a claw has a slit 17 cut from the fitting hole 15 toward the tapered side.
By inserting a connecting rod 19 located at one end of the ball chain 18 into the 17 and fitting a fitting hole 15 into the end edge 12 of the blind cap 9, one end of the ball chain 18 is locked to the ball. Can be connected with one touch so that it does not fall off.

On the other hand, the other end of the ball chain 18 is a fitting hole for a hookless eggplant connecting piece 21 made of an eggplant-shaped thin plate having a fitting hole 20 having a diameter corresponding to the thread groove diameter of the threaded portion 8 of the F-type connector.
Insert the connecting rod 19 of the ball chain 18 into the slit 22 formed by cutting from 20 to the tapered side, and insert the clawless eggplant type connecting piece 21 thereof into the fitting hole 20 and the screw in the screw portion 8 of the F type connector. It is sent to the base end of the F-type connector by aligning with the groove and is rotatably fitted to the non-threaded part of the base end so that it does not fall off like the case of the eggplant-shaped connecting piece 16 with the claws. Are linked together.

As a result, the blind cap 9 is attached to the ball chain at the base end of the F-type connector as shown in Fig. 4a.
In the state where the ball chain 18 is fastened by 18 and screwed to the F-type connector, the ball chain 18 is
The length is such that it hangs down in a U shape and the lower end portion thereof does not project downward from the lower end of the blind cap, the usable length of the ball chain 18 is reduced, and no extra protrusion is seen.

As described above, the eggplant-shaped connecting piece 16 with a claw can be connected to the base end of the threaded portion of the F-type connector by effectively utilizing the thread groove, and the eggplant-shaped eggplant-shaped connection piece connected to the base end of the F-type connector can be used. Since the shape connecting piece 21 can be easily removed by rotating it in the direction opposite to the above-described revolving feed, the blind cap 9 can be removed by the blind cap 9 when the ball chain 18 is rusted or damaged. Eggplant-shaped connecting piece without
You can replace the entire 6,21 with a new one.

The blind cap 9 is rotated when it is screwed into the F-type connector, but the eggplant-shaped connecting piece 16 with a claw freely rotates around the blind cap 9, so that the ball chain is not twisted.

In the embodiment, the trunk line amplifier is described as an example, but for branching,
The same applies to each amplifier, branching device, and distributor for extension and trunk line branching.

The number of output terminals and measuring instrument connection terminals is not limited to that of the embodiment, and the outer periphery of the blind cap may be appropriately modified by omitting knurling or by making it hexagonal so as to be easily tightened with a wrench. It doesn't matter.

According to the present invention, the blind cap can be effectively used by rotating and feeding the hookless eggplant type connection from the tip of the screw part of the measuring instrument connection terminal to the screwless part to fit the screwless part. Can be separated from the assembly of the measuring device connection terminal, and the eggplant-shaped connecting piece with a claw fitted in the blind cap is cut and raised by the elastic claw to prevent smooth rotation and dropout. In addition, the ball chain and the eggplant-shaped connecting piece without a claw and the eggplant-shaped connecting piece with a claw can be easily connected by using a slit, which is excellent in workability.

Further, the packing fitted on the inner bottom surface of the blind cap enhances the waterproof effect, which is suitable for outdoor use.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main line amplifier which is attached to a messenger wire in a suspended manner and to which a blind cap according to the present invention is connected. FIG. 2 is an exploded perspective view showing the blind cap according to the present invention. Fig. 3 is a cross-sectional explanatory view showing the mutual relationship between the blind cap and the nail-shaped eggplant-shaped connecting piece, Fig. 4a is an explanatory view showing a state in which the blind cap is removed from the F-type connector, and Fig. 4b is a blind cap. Is an explanatory view showing a state in which the F type connector is fixed to the F type connector, and FIG. 5 is a sectional explanatory view of FIG. 4b. 1 ... Case, 2 ... Input terminal, 3 ... Output terminal, 4 ...
… Coaxial cable, 5 …… Connector, 6 …… Wire connection part, 6a …… Bolt, 7 …… Messenger wire,
8 ... screw part, 9 ... blind cap, 10 ... thread, 11 ...
… Packing, 12 …… Edge part, 13 …… Recessed groove, 14… Elastic claw, 15… Fitting hole, 16… Claw-attaching eggplant-shaped connecting piece, 17 ……
Slit, 18 ... Ball chain, 19 ... Connecting rod, 20 ...
… Mating hole, 21 …… Eggplant-shaped connecting piece without claws.

Continuation of the front page (56) Reference JP-A-55-130082 (JP, A) JP-A-57-53076 (JP, A) Actually open Sho-56-54580 (JP, U) Actual-open Sho-52-161288 (JP , U) Actual public 45-4135 (JP, Y1) Actual public 43-22519 (JP, Y1) Actual public 55-53951 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A connection for connecting a base end of a screw portion of a measuring device connection terminal projecting outward of a case of an electronic device and an open end side of a cup-shaped screw-type blind cap through a ball chain. It is a stop structure, and a packing is fitted into the inner bottom surface of the blind cap, and a recessed groove circumferentially provided at the opening end edge of the blind cap has a fitting hole in which the elastic claw is cut out and raised in the inner circumference. While the eggplant-shaped connecting piece with claws is fitted, the eggplant-shaped connecting piece without a claw that has a fitting hole that matches the screw groove is fitted at the threadless part of the base end of the screw part of the measuring instrument connection terminal. The clawless eggplant-shaped connecting piece and the claw-shaped eggplant-shaped connecting piece are ball chains, and connecting rods located at respective ends of the ball chain are connected to the clawless eggplant-shaped connecting piece and the claw-shaped eggplant-shaped connecting piece. A slot formed by cutting from each mating hole on one side to the tapered side Each of them is connected to each other in a form in which they are respectively inserted into a box and locked by a ball, and the eggplant-shaped connecting piece without a claw can be fed by turning between a tip of a screw portion and a portion without a screw of a measuring instrument connecting terminal. Blind cap connection terminal connection structure.