JPH0637561Y2 - Attachment device for accessory of thermal overload relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a thermal overload relay that opens and closes a contact mechanism part by bending a bimetal due to an overcurrent flowing in a main circuit, and particularly a thermal overload relay. The present invention relates to a mounting device for accessory parts that are attached to a main body.

[Conventional technology]

In the thermal overload relay, the contact mechanism part is switched by the bimetal bending due to the overcurrent flowing in the main circuit,
A reset rod for returning the contact mechanism to the standby state for the next operation is provided outside the relay body. This type of thermal overload relay is often installed in a panel such as a control panel so that the reset rod can be operated from outside the door of the control panel without opening the door. A reset release is included as an accessory. This thermal overload relay with reset release is shown in FIGS. 5 and 6.

In FIG. 5, reference numeral 1 denotes a thermal overload relay, and this thermal overload relay 1 is provided with a main circuit terminal 2, an auxiliary contact terminal 3, a reset rod 4, an operating current adjusting dial 5, etc. It can be attached to the base plate. Reference numeral 7 denotes a mounting member for the reset release 8 shown in FIG. 6. The mounting member 7 has a release mounting portion 7a having a hole 7d at the upper end and a screwing portion 7e at the lower end.
And a metal fitting mounting portion 7b having a tongue piece portion 7f and a body portion 7c. As shown in FIG. 6, the reset release 8 is provided with an operation button 8b at one end of a flexible tube 8a and a push rod 8c at the other end, and when the operation button 8b is pushed, the push rod 8c protrudes to push the operation button 8b. When released, the operation button 8b and the push rod 8c are returned to their original states by a spring (not shown). The operation button 8b of the reset release 8 is mounted on the panel 9 such as the control panel with the nut 10
It is mounted by a, and the push rod 8c side is fixed to the mounting bracket 7 by the nut 10b through the hole 7d of the release mounting portion 7a of the mounting bracket 7. As shown in FIG. 5, the tongue piece 7f of the fitting 7 to which the reset release 8 is fixed is inserted into the guide groove 1a of the relay body, and the body portion 7c is brought into contact with the side wall of the relay body.
Then, the screw 11 is mounted by screwing the screw 11 into the screw hole 1b of the relay 1 through the hole 7g of the screw mounting portion 7e.

When an overcurrent flows in the main circuit connected to the main circuit terminal 2 and the thermal overload relay 1 operates, an operation indicator lamp (not shown) attached to the control panel panel 9 connected to the auxiliary contact terminal 3 is turned on. The operation is confirmed by lighting. To reset the thermal overload relay 1, push the operation button 8b of the reset release 8 attached to the panel 9 to push the push rod 8b.
The reset rod 7 is operated via.

[Problems to be solved by the device]

According to the conventional device described above, since the reset release 8 as an accessory is configured so that the mounting bracket 7 is mounted on the relay 1 by using the screw 11, the mounting by the screw 11 is troublesome and the tapping as a screw is performed. When a screw is used, powder is generated when the screw is tightened, and this powder has a drawback that it falls on other electric devices and adversely affects them.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the conventional device, and to attach accessory parts to the relay without using screws and to selectively attach a plurality of accessory parts to a thermal overload relay. Is to provide an accessory mounting device.

[Means for Solving the Problems]

According to the present invention, the bimetal is bent by the overcurrent flowing in the main circuit to open and close the contact mechanism portion, and the reset rod protruding above the relay is operated to reset the contact mechanism portion. In the thermal overload relay, a mounting recess for an accessory part consisting of an operation display unit or a reset release for operating the reset bar is formed in the vicinity of the reset bar on the upper part of the relay, and each mounting recess is provided with the mounting recess. A mounting groove common to the parts and a locking hole continuously provided in the mounting groove are provided, and the engaging projection and the mounting groove that are fitted to the mounting groove formed in the mounting recess in each of the accessory parts are provided. A locking arm having a hook at its tip is provided through the locking hole formed by connecting them, and the operation display unit or the reset release accessory is mounted in the mounting recess. It is achieved by.

[Action]

For the accessory part, insert the engaging projection into the mounting groove formed in the mounting recess so that the locking arm is aligned with the locking hole formed in the mounting recess of the relay, and then insert the tip of the locking arm. The hook is attached by passing through the locking hole and being locked to the relay. At this time, the engagement protrusion is fitted into the mounting groove and the hook of the locking arm is caught by the relay to prevent the slip-out. The accessory is removed by bending the locking arm and removing the hook to pull out the accessory.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 4 each show an embodiment of the present invention. In each drawing, the same parts as those in the conventional example shown in FIGS. 5 and 6 are designated by the same reference numerals and their description is omitted. .

In FIG. 1, a mounting recess 1A for an accessory is formed in the vicinity of the reset rod 4 projecting from the upper portion of the thermal overload relay 1. The mounting recess 1A has a trapezoidal cross section as shown in FIG. The mounting groove 1B and a locking hole 1C that is continuous with the mounting groove 1B and penetrates the relay 1 are provided. An L-shaped mounting base 8A is fixed to the push rod (see FIG. 6) side of one end of the reset release 8 as an accessory, and this mounting base 8A has a locking hole 1C as shown in FIG. A matching trapezoidal engaging protrusion 8B is provided, a locking arm 8C protruding from the engaging protrusion 8B is provided, and a hook 8D is formed at the tip of the locking arm 8C.

The mounting base 8A to which the reset release 8 is fixed is mounted on the relay 1 by inserting the hook 8D at the tip of the locking arm 8C into the locking hole 1C along the mounting groove 1B and the engaging projection 8B. Fit in 1B. When the engaging projection 8B is fitted into the mounting groove 1B, the mounting base 8A is inclined due to the protrusion of the hook 8D, so that the engaging projection 8B cannot be fitted into the mounting groove 1B in this state. Therefore, by pushing the mounting base 8A toward the mounting groove 1B so that the engaging projection 8B coincides with the mounting groove 1B, the locking arm 8C bends due to its own elastic force. Mounting groove 1B
And press the mounting base 8A. Mounting recess for mounting base 8A
When pushed until it fits into 1A, the hook 8D at the tip of the locking arm 8C projects from the locking hole 1C to the front side of the relay 1. As a result, the curved locking arm 8C is restored, and the hook 8D is locked to the front surface of the relay 1.

In the mounting base 8A thus mounted on the relay 1, the engaging projection 8B is fitted into the mounting groove 1B and the hook 8D prevents the mounting base 8A from coming off in the front-rear and left-right directions. The push rod on one end side of the reset release 8 faces the reset rod 4 with the mounting base 8A attached to the relay 1.

The mounting base 8A to which the reset release 8 is fixed is removed by pulling the mounting base 8A in a state in which the locking arm 8C is curved so that the hook 8D of the locking arm 8C can be disengaged from the front surface of the relay 1 with a tool. be able to.

Next, FIG. 4 shows a case where an operation display unit as an accessory is attached to the relay 1. The operation display unit 80 is used when the reset release 8 described above is not used, that is, when the thermal overload relay 1 is not installed and installed in the control panel, or when the reset release is not used even if it is installed in the control panel. It is used to display the operating state of the relay 1. Lead wires 81,8 in the operation display unit 80
2 has a built-in operation indicator lamp 83 such as a light emitting diode connected in series, and is used by connecting the lead wires 81 and 82 to the auxiliary contact terminal 3. The operation display unit 80 includes an engaging projection 8B of the mounting base 8A of the reset release 8 described above.
An engaging projection (hidden in the figure) having the same shape as the locking arm 8C having a hook 8D, a locking arm 84 and a hook 85 are provided.
The thermal overload relay 1 is the same as that shown in FIG. 1, and the mounting and removal of the operation display unit 80 to and from the relay 1 are the same as those in the above-mentioned embodiment, so the description thereof will be omitted.

[Effect of device]

As described above, according to the present invention, the bimetal is bent by the overcurrent flowing in the main circuit to open / close the contact mechanism portion, and the reset rod protruding above the relay is operated to open the contact mechanism portion. In the thermal overload relay to be reset, a mounting recess for an operation display unit or an accessory component consisting of a reset release for operating the reset bar is formed in the vicinity of the reset bar above the relay, and the mounting recess is provided in the mounting recess. A fitting groove common to each accessory and a locking hole continuous with the fitting groove are provided, and an engaging projection and the fitting that fit into the fitting groove formed in the fitting recess in each accessory. A locking arm having a hook at its tip is provided through a locking hole formed continuously with the groove, and an accessory of either the operation display unit or the reset release is provided in the mounting recess. By installing the accessory, it is possible to attach and remove accessories with one touch. Therefore, even after installing the thermal overload relay in the control panel and attaching or removing accessories as necessary. This has the advantage that the reset release and the operation display unit can be selectively mounted.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, respectively. FIG. 1 is an exploded perspective view of a thermal overload relay and accessory parts, FIG. 2 is a cross-sectional view of its main part, and FIG. Shows the mounting base,
3 (A) and 3 (B) are structural views as seen from the directions of arrows P and Q in FIG. 1, respectively, and FIG. 4 is an exploded perspective view of the thermal overload relay and the operation display unit, and FIG. FIG. 6 and FIG. 6 are an exploded perspective view showing a conventional device and a structural diagram of accessory parts, respectively. 1: Thermal overload relay, 1A: Mounting recess, 1B: Mounting groove, 1C: Locking hole, 4: Reset rod, 8: Reset release, 8A: Mounting base, 8B: Engaging projection, 8C: Engagement Stop arm, 8D: Hook, 80: Motion display unit.

Claims (1)

[Scope of utility model registration request] 1. A thermal overload relay that opens and closes a contact mechanism section by bending a bimetal due to an overcurrent flowing in a main circuit, and resets the contact mechanism section by operating a reset rod protruding above the relay section. In the above, in the vicinity of the reset rod on the upper part of the relay, a mounting recess for an accessory that consists of the operation display unit or the reset release for operating the reset rod is formed, and the common mounting for each accessory is formed in this mounting recess. A groove and a locking hole continuous with the mounting groove are provided, and the engaging protrusions that fit into the mounting groove formed in the mounting recess are formed in each of the accessory parts, and are formed continuously with the mounting groove. A locking arm having a hook at the tip and penetrating through the locking hole provided, and an accessory for either the operation display unit or the reset release is mounted in the mounting recess. Accessory mounting device for a hot overload relay according to claim.