JPH1129280A - Electromagnetic brake for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance, inspection and replacement work of an auxiliary spring provided to release a damper fixed to one end of each arm of an electromagnetic brake by providing this auxiliary spring at an upper or lower peripheral part of one end of the arm. SOLUTION: Spring force of an auxiliary spring 41 inserted between brackets 40a, 40b provided at the upper parts of one end parts of arms 2a, 2b acts in such a way as to open one end parts of the arms 2a, 2b. This spring force is extremely small compared to spring force of a spring 12 but eliminates play around a supporting shaft 4 and pins 22, 23 at the time of energizing electromagnets 32a, 32b. The auxiliary spring 41 can be provided at the lower parts of one end parts of the arms 2a, 2b or at both upper and lower parts. Such installation facilitates maintenance, inspection and replacement work of the auxiliary spring 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electromagnetic brake for an elevator of a rail pressure type.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 7-2452, a rail-clamping type electromagnetic brake for elevators is composed of a rope guided by a guide rail and a balance weight. Be combined.

In this disclosed example, a linear motor provided on a counterweight is used to move up and down, and an electromagnetic brake acts on a guide rail.

The structure of a rail-clamping type electromagnetic brake mounted on this elevator is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-107833, which is shown in FIGS. In these figures, the electromagnetic brake 17 brakes the guide rail 1 extending in a direction perpendicular to the plane of FIG.

A pair of arms 2a and 2b are rotatably connected via a support shaft 4 to support portions 3 projecting from an intermediate portion thereof, so that a portion sandwiching the guide rail 1 can be opened and closed.

A back plate 6 on which a brake 7 is mounted is attached to one end of each of the arms 2a and 2b by bolts 5.

On the other hand, the other ends of the arms 2a and 2b support the outer ends of the shaft pieces 9a and 9b constituting the telescopic shaft 9 via pins 16 so as to be rotatable. And the shaft pieces 9a, 9b
The inner ends of the shaft pieces 9a and 9b are slidably inserted into insertion holes 10 formed at the inner ends of the shafts 9a and 9b. A pair of electromagnet main bodies 11a, 11b are fixed to the shaft pieces 9a, 9b, and both have a movable structure. A spring 12 is interposed between the electromagnet bodies 11a and 11b. The coil 13 is built in the electromagnet main body 11b.

The arms 2a, 2b for mounting the brakes 7
A release bolt 32 for forcibly releasing the arms 2a and 2b and an auxiliary spring 41 are provided around the release bolt 32 at the center of one end of the electromagnet main body 1.
The brake element 7 can be easily separated at the time of energizing 1a and 11b, and in particular, play around the support shaft 4 and the pin 16 is removed.

The electromagnetic brake 17 is attached by connecting the support shaft 4 to a lifting / lowering body (not shown) which is a braked body. In the electromagnetic brake 17, the electromagnet body 1
In the state where 1a and 11b are not biased, the other ends of the arms 2a and 2b are separated from each other by the force of the spring 12, so that one end of the arms 2a and 2b is in a braking state with the guide rail 1 interposed therebetween. . When the electromagnet bodies 11a, 11b are urged, the electromagnet bodies 11a, 11
1b is attracted, and one ends of the arms 2a and 2b are opened to be in a non-braking state.

[0010]

In FIGS. 4 and 5 of the prior art, the auxiliary spring is provided at one end of the arm with the guide rail 1.
Since it is provided at the center in the direction, when the brake is engaged with the rail, there is a problem that maintenance, inspection, and replacement are difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to perform maintenance, inspection,
An object of the present invention is to provide a rail clamping type electromagnetic brake for an elevator that can be easily replaced.

[0012]

In order to achieve the above object, according to the present invention, a support shaft is provided on an elevating body which is a braked body, and a substantially intermediate portion is rotatably connected via the support shaft. A pair of arms, a brake element sandwiching a guide rail for guiding the elevating body is fixed to one end of the pair of arms, and a pair of electromagnets is attached to the other end of the pair of arms, Elevator electromagnetic configured by an elastic force of a spring interposed between a pair of arms and an auxiliary spring provided to drive the pair of arms by the pair of electromagnets and to release the brake element. In the brake, the auxiliary spring is provided on an outer peripheral portion above or below one end of the pair of arms.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the related art will be described with the same reference numerals.

FIGS. 1 and 2 show the overall structure of an electromagnetic brake according to the present invention, and FIG. 3 is a structural view showing another embodiment of the auxiliary spring in FIGS.

In these figures, the electromagnetic brake 51 brakes the guide rail 1 extending in a direction perpendicular to the plane of FIG. The pair of arms 2a and 2b
The support portions 3 protruding from the intermediate portion are rotatably connected via a support shaft 4 so as to be freely opened and closed.

A back plate 6 on which a brake 7 is mounted is attached to one end of each of the arms 2a and 2b by bolts 5.

On the other hand, as shown in FIG. 2, a concave notch 8 is formed at the other end of each of the arms 2a and 2b, and a guide shaft 21 is provided between the other ends of the arms 2a and 2b. One end of the guide shaft 21 and one of the other ends of the arms 2a and 2b are rotatably connected by pins 22. The other end of the guide shaft 21 passes through the elongated hole 24 of the guide shaft 21 shown in FIG. The other ends of the arms 2a and 2b are connected by pins 23. As a result, the other ends of the arms 2a and 2b are rotatably connected, and the guide shaft 21 is slidably connected.

The shaft 21 is screwed to a flange 26 and fixed by a rotation preventing member 27. One of the electromagnets 28a forming a pair of electromagnet bodies 28a and 28b is fixed to the flange 26 with bolts 29, and the other electromagnet 28b of the electromagnet bodies 28a and 28b has a magnetic pole facing the one electromagnet 28a. Thus, it is slidably supported on the guide shaft 21 via a bearing 30. Then, the flange 31 provided on the other electromagnet 28b and the arm 2
The other end of “a” is rotatably connected by the pin 23.

The spring 12 is interposed between the electromagnet main bodies 28a and 28b, and the electromagnets 28a and 28b are both movable.

The electromagnet bodies 28a and 28b incorporate coils 32a and 32b, respectively. A force is applied by the force of the spring 12 so as to push the other ends of the arms 2a and 2b apart.
To obtain the braking force.

As shown in FIG. 2, the electromagnetic brake 51 is mounted by connecting the support shaft 4 to an elevating body 33 which is a braked body. In this electromagnetic brake 51,
When the electromagnet bodies 28a and 28b are not biased, the other ends of the arms 2a and 2b are separated from each other by the force of the spring 12, so that one end of the arms 2a and 2b is in a braking state with the guide rail 1 interposed therebetween. become.

When the electromagnet main bodies 28a, 28b are urged, the electromagnet main bodies 28a, 28b
Are attracted, and one ends of the arms 2a and 2b are opened to enter a non-braking state.

In this embodiment, an example in which the spring 12 is built in the electromagnet has been described.
a, 28b. The electromagnet body 2
8a, 28b, the coil 32a or the coil 32
b may be incorporated.

Reference numeral 41 denotes an auxiliary spring inserted between brackets 40a and 40b provided above one ends of the arms 2a and 2b, and a spring force acts to open one ends of the arms 2a and 2b. The spring force is very small as compared with the spring 12 shown in FIG. The auxiliary spring 41 removes play around the support shaft 4 and the pins 22 and 23 when the electromagnets 32a and 32b are biased.

Since the frictional force around the support shaft 4 and the pins 22 and 23 is different for each electromagnetic brake, the auxiliary spring 41
It is necessary to adjust the spring force.

FIG. 3 shows a configuration in which the spring force of the auxiliary spring 41 in FIG. 2 can be adjusted. That is, the L-shaped bracket 42 is provided above one end of the arms 2a and 2b.
a, 42b are provided, and a spring holding shaft 43 is screwed into one of the brackets 42b, and is fixed with a nut 44.
The spring 41 is mounted between one bracket 42a and the holding shaft 43. The spring force rotates the holding shaft 43, and the spring 4
1 is performed by changing the compression amount.

In the above example, the case where the auxiliary spring 41 is provided above one end of the arms 2a and 2b has been described.
It may be provided below one end of the arms 2a, 2b, or may be provided both above and below one end of the arms 2a, 2b.

According to this embodiment, the electromagnets 32a, 32
An auxiliary spring 41 for removing backlash around the support shaft 4 of the arms 2a and 2b and the pins 22 and 23 when the arm 2b is urged,
Since the auxiliary springs 41 are provided above or below one end of the arms 2a and 2b, a rail clamping type electromagnetic brake for an elevator that can easily perform maintenance, inspection, and replacement of the auxiliary spring 41 is obtained.

[0029]

As described above, according to the present embodiment, the arm 2 when the electromagnets 32a and 32b are energized is used.
The auxiliary spring 41 for removing backlash around the support shaft 4 and the pins 22 and 23 of the a and 2b is provided above or below one end of the arms 2a and 2b, so that maintenance, inspection and replacement of the auxiliary spring 41 are performed. A rail clamping type electromagnetic brake for an elevator that is easy to use is obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration plan view of an electromagnetic brake showing an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is another embodiment of the auxiliary spring structure of FIG. 1;

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional electromagnetic brake.

FIG. 5 is a diagram corresponding to FIG. 2, showing a conventional electromagnetic brake.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Guide rail, 2a, 2b ... Arm, 4 ... Support shaft,
7 ... brake, 12 ... spring, 28a, 28b ... electromagnet, 3
3 ... Lifting body, 41 ... Car, 51 ... Electromagnetic brake.

Claims (1)

[Claims] 1. A lift shaft, which is a braked member, is provided with a support shaft, and a pair of arms having a substantially intermediate portion rotatably connected via the support shaft is provided at one end of the pair of arms. A brake element sandwiching a guide rail that guides the elevating body is fixedly mounted, a pair of electromagnets is attached to the other end of the pair of arms, and a spring force interposed between the pair of arms and the elastic force of the spring. An electromagnetic spring for driving the pair of arms by an electromagnet, and an auxiliary spring provided to release the brake element, wherein the auxiliary spring is provided on one end of the pair of arms. Alternatively, an electromagnetic brake for an elevator, which is provided on a lower outer peripheral portion.