JPH048616Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a method for connecting the connection terminal of a main amplifier, etc. to the main terminal of main equipment such as an electromagnetic contactor installed on a distribution board, switchboard, etc. It is related to the device.

(Prior Art) For example, terminal connection bolts are attached in advance to the main terminals of devices such as electromagnetic contactors. This bolt is usually tightened to the main terminal of the device by the switchboard manufacturer. Therefore, when connecting a connecting terminal of a master amplifier or the like to the main terminal, the contractor must loosen the bolt, remove the nut, attach the connecting terminal, and then tighten the bolt and nut again.

(Problems to be solved by the invention) In the conventional terminal connection method described above, when the bolts are loosened by the construction company, the bolts may fall off from the main terminals, fall into the switchboard box, and become unrecoverable. , this may catch on live parts and cause a short circuit. Also, when re-tightening a bolt or nut that has been loosened, it is necessary to tighten the nut while fixing the head of the bolt with a spanner, etc., and depending on where the equipment is installed, it may not be possible to use a spanner, etc. There are some problems, such as:

Therefore, an object of the present invention is to provide a terminal connection device that can prevent bolts from falling off and does not require fixing the bolt heads when retightening bolts and nuts.

(Means for solving the problem) In this invention, in order to solve the above problem,
The bolt 3 that is screwed into the screw hole 2a of the main terminal 2 has a large diameter rod portion 3a with a thread on the tip side, and a small diameter rod portion 3b without a thread on the head 3c side. The detent fitting 8 interposed between the portion 3c and the main terminal 2 includes at least a pair of engagement pieces 8b that engage with both side edges of the main terminal 2, and at least a pair of engagement pieces 8b that engage with both opposing sides of the bolt head 3c. At least one pair of engaging portions 8c that fit together were provided to constitute a connecting device for electrical equipment terminals.

(Function) In the connection device of the present invention, the detent fitting 8
The engaging piece 8b engages with the main terminal 2, and the engaging portion 8c engages with the bolt head 3c to prevent rotation of the bolt 3 relative to the main terminal 2, so the nut 4 can be loosened or tightened. There is no need to specifically prevent the bolt 3 from rotating. Further, even if the nut 4 is removed from the bolt 3, the large diameter threaded rod portion 3a is caught in the screw hole 2a of the main terminal 2, so the bolt 3 will not fall off from the main terminal 2. Since the small-diameter rod portion 3b of the bolt 3 is not screwed into the screw hole 2a of the main terminal 2, by tightening the nut 4, the connecting terminals 5 and 9 on both sides of the main terminal 2 can be securely tightened at the same time.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 to 4.
Figure 1 is a front view of the terminal connecting device, Figure 2 is a plan view of the terminal connecting device, Figure 3 is a sectional view of Figure 1,
FIG. 4 is a perspective view of the detent fitting.

In the figure, reference numeral 1 denotes an electromagnetic contactor, which is provided with a main terminal 2 extending laterally. The main terminal 2 includes a screw hole 2a into which a terminal connection bolt 3 is screwed.

The bolt 3 is provided with a large-diameter rod portion 3a on the distal end side, which is a screw threaded into the screw hole 2a of the main terminal 2, and a small-diameter rod portion 3b on the head side 3c.

The nut 4 is screwed into the large diameter threaded rod portion 3a of the bolt 3, and holds the connecting terminal 5 between it and the main terminal 2. 6 is a washer and 7 is a spring washer.

The detent fitting 8 is interposed between the bolt head 3c and the main terminal 2, has a hole 8a in the center thereof through which the bolt 3 passes, and engages with both side edges of the main terminal 2. It includes a pair of engagement pieces 8b, 8b, and a pair of engagement parts 8c, 8c that engage with opposite opposite sides of the bolt head 3c. That is, in this embodiment, the detent fitting 8 is formed by pressing a steel plate, and the engaging piece 8b is formed by bending tongue pieces formed on both edges of one end at a right angle to stand up. The joint portion 8c is formed by punching out both sides of the hole 8a toward the side opposite to the engagement piece 8b. Reference numeral 9 denotes a branch connection terminal generally referred to as a branch amplifier, and is interposed between the detent fitting 8 and the main terminal 2. This branching connection terminal 9 passes between the pair of engagement pieces 8b, 8b of the detent fitting 8 and extends laterally.

When the bolt 3 and nut 4 are tightened, the connection terminal 5, main terminal 2, branch connection terminal 9, and detent fitting 8 are all in positions corresponding to the small diameter rod portion 3b of the bolt 3, and the bolt The large diameter threaded rod portion 3a of No. 3 is not screwed into the screw hole 2a of the main terminal 2.

Thus, the switchboard is initially installed with the detent fittings 8 and the branch connection terminals 9 attached to the main terminals 2 and the bolts 3 and nuts 4 tightened. Then, the construction company loosens the bolts 3 and nuts 4, removes the nuts 4, attaches a connection terminal 5 called a main amplifier, and then tightens the bolts 3 and nuts 4 again. Even if the nut 4 is removed during this operation, the bolt 3 will not fall off from the main terminal 2 because the large diameter threaded rod portion 3a will fit into the screw hole 2a of the main terminal 2. bolt 3
is inserted into the screw hole 2a of the main terminal, the engaging pieces 8b of the detent fitting 8 are always attached to both side edges of the main terminal 2, and the engaging parts 8c are attached to the bolt head 3.
Since the nut 4 is engaged with the opposing surfaces of both sides of the bolt 4 to prevent the bolt 3 from rotating with respect to the main terminal 2,
There is no need to prevent the bolt 3 from turning when loosening or tightening. In addition, since the small diameter rod portion 3b of the bolt 3 is not screwed into the screw hole 2a of the main terminal 2, simply tightening the nut 4 (without rotating the head 3c of the bolt 3) The connection terminals 5 and 9 on both sides are securely tightened at the same time.

(Effects of the invention) As described above, in the present invention, the bolt 3 that is screwed into the screw hole 2a of the main terminal 2 is provided with a large diameter rod portion 3a with a thread on the tip side, and a threaded large diameter rod portion 3a is provided on the head 3c side. A small diameter rod portion 3b is provided, and the bolt 3
The locking fitting 8 interposed between the head 3c and the main terminal 2 includes at least a pair of engagement pieces 8b that engage with both side edges of the main terminal 2, and a pair of engagement pieces 8b that engage with both side edges of the bolt head 3c. at least one pair of engaging portions 8c that engage with the
Since the connecting device for electrical equipment terminals is configured by providing the following, it is possible to prevent the bolt 3 from falling off from the main terminal 2, and to secure the head of the bolt 3 when re-tightening the bolt 3 and nut 4. This has the effect that there is no need to do so.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of the terminal connecting device, Fig. 2 is a plan view of the terminal connecting device, Fig. 3 is a cross-sectional view of Fig. 1, and Fig. 4 is a cross-sectional view of the terminal connecting device. FIG. 3 is a perspective view of a detent fitting. 1... Equipment, 2... Main terminal, 2a... Screw hole,
3...Bolt, 3a...Large diameter rod portion, 3b...Small diameter rod portion, 3c...Head, 4...Nut, 5...Connection terminal, 8...Detent fitting, 8b...Engagement piece , 8
c...Engagement part.

Claims (1)

[Scope of Claim for Utility Model Registration] A bolt having a large-diameter rod portion on the tip side with a screw cut into it to be screwed into a screw hole of a main terminal, and a small-diameter rod portion on the head side; a nut that is screwed onto the diameter rod portion and holds the connecting terminal between the main terminal; and a hole that allows the bolt to pass through, the nut being interposed between the head of the bolt and the main terminal; It is characterized by comprising a detent fitting having at least a pair of engaging pieces that engage with both side edges of the main terminal and at least a pair of engaging parts that engage with both opposing sides of the bolt head. Connection device for terminals for electrical equipment.