JPH075300Y2 - Manual release device for electromagnetic brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a manual release device for an electromagnetic brake, such as an escalator, which manually releases the electromagnetic brake, and more particularly,
The present invention relates to a manual release device for an electromagnetic brake that is suitable for easy carrying.

[Prior Art] Generally, in the case of an escalator or the like, when a motor constituting a drive mechanism for driving a step or a moving handrail stops, an inertial force that tries to rotate the motor works, so that the safety of passengers on the step is improved. To achieve this, an electromagnetic brake is provided which automatically operates when the motor is stopped and holds the braking state so that the motor does not rotate.

Further, at the time of maintenance and inspection of the steps and the like, it is necessary to manually rotate the motor to gradually move the steps and the like at a slower speed than in normal operation. At this time, if the motor is held in the braking state by the operation of the electromagnetic brake as described above, a considerably large force is required to rotate the motor, which makes the work difficult.
It's not convenient. Therefore, conventionally, a manual release device has been proposed that releases the electric brake by manual operation during maintenance and inspection.

FIG. 3 is a perspective view showing a conventional manual release device for an electromagnetic brake of this type.

Generally, as shown in FIG. 3, an electromagnetic brake is provided with a drum 1 connected to a motor (not shown) and a pair of brake shoes 2, 2a capable of contacting the outer peripheral surface of the drum 1, respectively. A pair of arms 3 and 3a capable of opening legs around the lower end of the arm, a rod 4 engaging with the upper ends of the arms 3 and 3a, and the arms 3 and 3a attached to the rod 4 in a direction to approach each other. It is composed of urging braking springs 5 and 5a, and a coil 6 which moves the arms 3 and 3a in directions away from each other against the force of the braking springs 5 and 5a.

The conventional manual release device used for such an electromagnetic brake has a relatively large length dimension and a first lever 7 whose lower end is engageable with one arm 3 and the first lever 7.
Is rotatably connected to the lever 7 and the lower end is the other arm.
It comprises a second lever 8 engageable with 3a and an engagement tool 9 for locking the first lever 7 and the second lever 8 into an engaged state.

In this conventional manual opening device, for example, at the time of maintenance and inspection of the escalator described above, the lower ends of the first lever 7 and the second lever 8 are respectively connected to the arms 3, 3a as shown in FIG. The upper end of the first lever 7 is pushed down to separate the arms 3 and 3a from each other, that is, the arms 3 and 3a are opened about their lower ends. In this state, the first lever 7 and the second lever 8 are locked by the engagement tool 9. As a result, the brake shoes 2 and 2a are kept separated from the drum 1, and the motor to which the drum 1 is connected can rotate freely, and the motor can be manually rotated for maintenance and inspection. .

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional manual release device for an electromagnetic brake, since the first lever 7, the second lever 8 and the engaging tool 9 are included, the number of members is reduced. Since the first lever 7 having many and relatively long dimensions is required, the whole size becomes large, which results in a heavy weight, and it is difficult to say that it is convenient for a maintenance person to carry.

The present invention has been made in view of the actual situation in the prior art as described above, and an object thereof is to provide a manual release device for an electromagnetic brake that enables downsizing as a whole and weight reduction. .

[Means for Solving the Problems] In order to achieve this object, the electromagnetic brake manual release device of the present invention operates by manually opening each of a pair of arms against a braking spring. In a manual release device for an electromagnetic brake that releases each of the arms, the leaf spring body is formed of a leaf spring body capable of contacting each of the arms, and the leaf spring bodies are opened to open the legs. Is locked to the rod that guides each of the arms before the leaf spring body is completely inverted.

[Operation] Since the electromagnetic brake manual release device of the present invention is configured by the leaf spring body as described above, when the electromagnetic brake is manually released, the respective end portions of the leaf spring body are connected to the electromagnetic brake. It suffices that the leaf spring body is engaged with the arms so that the whole leaf spring body is bent so as to be convex outward, and the leaf spring body is pressed from this state. As a result, the ends of the leaf spring body move the arms away from each other, and the leaf spring body is inverted from the outward convex state to the inward convex state.
In this state, the arms are locked and locked by the rods that guide the arms. Therefore, the outer dimensions of the leaf spring body need only be slightly larger than the dimension between the arms of the electromagnetic brake, and the thickness of the leaf spring body is also small, which makes it compact and lightweight.

[Embodiment] An embodiment of a manual release device for an electromagnetic brake according to the present invention will be described below with reference to the drawings.

1 and 2 are explanatory views showing an embodiment of a manual release device for an electromagnetic brake according to the present invention. FIG. 1 is a front view showing a usage state of the manual release device, and FIG. 2 is a manual release device. It is a perspective view which shows a structure. Incidentally, in FIG. 1, the same components as those shown in FIG.
Overlapping description will be omitted as appropriate.

As shown in FIG. 2, the manual opening device of the present invention comprises a leaf spring body 10, which is the first leaf spring.
11, a second leaf spring 12, and a fastener for fastening the first leaf spring 11 and the second leaf spring 12 so that they can move relative to each other, such as a bolt 13 and a thumbscrew 14. . An elongated hole 15 is formed in the second leaf spring 12, and the first leaf spring 11
A bent portion 16 is formed at the end of the. Bolt 13 above
Is a hole (not shown) of the first leaf spring 11 and the second leaf spring.
It is inserted in the elongated hole 15 of 12 and the thumbscrew 14 is screwed. By tightening this thumbscrew 14, the first leaf spring 11 and the second leaf spring 11
The leaf springs 12 are fixed together.

In this embodiment, when the manual release of the electromagnetic brake is required, the thumbscrew 14 of the leaf spring body 10 shown in FIG. 2 is loosened so that the entire length of the arm 3, 3a shown in FIG. After setting so that it is slightly longer than the width of the upper end, the thumbscrew 14 is tightened so that the first leaf spring 11 and the second leaf spring 12 are integrally fixed. Next, as shown in FIG. 1, the end portion of the first leaf spring 11 forming the leaf spring body 10 is engaged with the upper end of one arm 3, and the second end portion 12 is brought into contact with the other arm 3a. The leaf spring body 10 is bent so as to be convex outward by engaging with the upper end of the. If pressing force is applied to the leaf spring body 10 in this state,
The respective ends move the arms 3 and 3a away from each other, the brake shoes 2 and 2a move away from the drum 1, and the leaf spring body 10 is inverted from the outwardly convex state to the inward convex. Then, the arm 4 is locked and locked by the rod 4 that guides the arms 3 and 3a. As a result, the rotation of the drum 1,
That is, the rotation of the motor connected to the drum 1 is free, the motor can be manually rotated, and desired maintenance and inspection can be performed.

In the embodiment configured in this way, the first leaf spring 1
1, the second leaf spring 12 is relatively thin, so it is lightweight,
Also, loosen the thumbscrew 14 and use the guide of the bent part 16 to
By moving the plate spring 11 and the second plate spring 12 of each other, the size can be reduced to the minimum necessary, and therefore the port spring is easy to carry.

[Advantages of the Invention] Since the electromagnetic brake manual release device of the present invention is configured as described above, it is lighter in weight and smaller than conventional ones, and is easy to carry.
There is an effect that it is possible to improve the workability of various works performed by using this manual opening device.

[Brief description of drawings]

1 and 2 are explanatory views showing an embodiment of a manual release device for an electromagnetic brake according to the present invention. FIG. 1 is a front view showing a usage state of the manual release device, and FIG. 2 is a manual release device. FIG. 3 is a perspective view showing the structure, and FIG. 3 is a perspective view showing a conventional electromagnetic brake manual release device. 1 ... drum, 3,3a ... arm, 4 ... rod, 5,5a ...
... Braking spring, 10 ... Leaf spring body, 11 ... First leaf spring, 12
...... Second leaf spring, 13 ...... Bolt, 14 ...... Thumbscrew, 15 ...
… Oval hole, 16 …… Bent part.

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A manual release device for an electromagnetic brake in which a pair of arms are manually opened against a braking spring to release a brake operation, and a leaf spring that can come into contact with each of the arms. The leaf spring body is opened to open each of the arms, and at the time of the inversion, the leaf spring body is formed into a rod that guides each of the arms before the leaf spring body is completely inverted. Manual release device for electromagnetic brake, characterized by locking. 2. A leaf spring body comprising a first leaf spring, a second leaf spring, and a fastener for fastening the first leaf spring and the second leaf spring so that they can move relative to each other. The manual release device for an electromagnetic brake according to claim 1, wherein: