JPS6147044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a terminal connection portion of an OF cable.

At the terminal connection part of the OF cable, as shown in FIG. 1, a fixed terminal 2 for connection to other electrical equipment is attached to the tip of a conductor pull-out rod 1.
This fixed terminal 2 can be made by clamping the tip of the conductor pull-out rod 1 between two half-split terminal plates and tightening the screw, or by cutting a female thread into a cylindrical terminal and forming a male thread at the tip of the conductor pull-out rod 1. Something that screws onto a screw,
and so on.

On the other hand, there is a second
As shown in the figure, a connector 3 is partially embedded in and protrudes from the tip of the conductor pull-out rod 1, and a closing plug 4 is tightly fitted to the tip of the connector 3, which is held down by a cap nut 5. There is. The above connector 3 has an inner hole 7 that matches the passage 6 provided in the center of the conductor pull-out rod 1.
The end of the valve rod 8 of the check valve is inserted into the inner hole 7 of the check valve. A spring receiver 9 is adjustably attached to the middle of the insertion portion of the valve rod 8, and a spring 11 is interposed between the receiver 9 and a protrusion 10 provided on the inner periphery of the end of the inner hole 7. , the valve rod 8 is urged in the direction of the plug 4 and its tip is brought into contact with the plug 4.

By the way, when connecting the above-mentioned fixed terminal 2 to the tip of the conductor pull-out rod ₁ as shown in FIG. Protrusion amount from 1 ₂
is a portion that does not contribute to connection with the fixed terminal 2 at all. As a result, the contact area with the fixed terminal 2 is insufficient, or the screw-in length is insufficient, and the connection portion generates heat, making it impossible to ensure the allowable current capacity.

The object of the present invention is to provide a structure of a terminal connection part that solves the above-mentioned problems. Hereinafter, this invention will be explained based on FIGS. 3 and 4.

The connecting portion according to the present invention has a structure in which a recess 21 is provided at the tip of a conductor pull-out rod 20, and all members such as a connector 22, a plug 23, and a fastening fitting 24 are inserted into the recess 21. That is, the connector 22
is an inner hole 26 that matches the passage 25 of the conductor pull-out rod 20.
A sloped stepped portion 27 is formed in the middle of the inner hole 26, and a check valve 2 is formed toward the small diameter portion of the inner hole 26.
8 (see FIG. 4) is inserted into the end of the valve rod 29, and the plug 23 is inserted into the middle of the inner hole 26. The plug 23 has a tapered surface that comes into close contact with the inclined stepped portion 27, and has a valve rod 29 at one end.
The tip of the is pressed. Plug the valve rod 29 into the plug 2
The structure that biases in three directions is similar to the conventional case,
A spring 32 is interposed between a receiver 30 fitted on the valve rod 29 and a protrusion 31 provided at the end of the inner hole 26.

A locking step 33 is provided in the middle of the plug 23, and the tip of the tightening fitting 24 is connected to the locking step 33.
is engaged in. A thread is cut on the outer periphery of the fastening metal fitting 24, and the fastening metal fitting 24 is screwed to the connector 22 by a screw provided on the inner periphery of the large diameter portion of the inner hole 26. The connector 22 and the conductor pull-out rod 20 are
After the screws are connected, they are fixed by silver soldering or by pouring silver solder into the gap provided between the two. The sag ₃ from the tip of the conductor pull-out rod 20 of the connector 22 is set to a length such that the fastening fitting 24 does not protrude from the tip.

In addition, an upper end fitting 34 is screwed around the conductor pull-out rod 20, and the conductor pull-out rod 20 is also screwed.
A lock nut 35 is fastened to the outer periphery of the tip of 0.

The structure of the terminal connection part according to the present invention is as described above, and the fixed terminal 36 is fitted into a seat provided at the tip of the upper end fitting 34 and bolted, as shown in FIG. The connection structure of this fixed terminal 36 does not use the upper end fitting 34 as described above.
As in the conventional case, the connection may be made by directly contacting the outer periphery of the conductor pull-out rod 20, or by being directly screwed to the conductor pull-out rod 20.

In FIG. 4, arrows indicate the flow of oil when the check valve 28 is pushed open by the plug 23.

As described above, the present invention provides a recess at the tip of the conductor pull-out rod protruding from the upper end of the terminal connection part, and a passage-blocking member provided in the pull-out rod, that is, a plug and a fastening metal fitting, and a recess provided in the passage. Check valve operating members, i.e., springs, plugs, clamps, and other parts attached to each of the above components, i.e., connectors, etc., are all housed in the recess, and there are no members protruding from the tip of the conductor pull-out rod. Therefore, the first
The entire portion of the protrusion amount ₁ shown in the figure can be used as an effective portion for connection with the fixed terminal, which has the effect of ensuring reliable connection. Also the parts that are not useful for connection
₂ does not exist, there is also the effect that the total length of the terminal connection portion can be shortened by that much.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional terminal connection section, FIG. 2 is a partially enlarged sectional view thereof, FIG. 3 is a partially enlarged sectional view of the terminal connection section of the present invention, and FIG. 4 is a terminal connection of the present invention. FIG. 20... Conductor pull-out rod, 21... Recess, 22...
Connector, 23...Plug, 24...Tightening fitting,
25... Passage, 26... Inner hole, 27... Inclined step, 29... Valve rod, 30... Receiver, 31...
... protrusion, 32 ... spring, 33 ... locking step.

Claims (1)

[Claims] 1. A recess is provided at the tip of the conductor pull-out rod protruding from the upper end of the terminal connection part, and a passage closing member provided in the pull-out rod, a check valve operating member provided in the passage, and all other attached parts are removed as described above. A terminal connection part for an OF cable, which is housed in a recess and has no member protruding from the tip of the conductor pull-out rod.