JP2896285B2 - Brake mechanism of elevator hoist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake mechanism for an elevator hoist.

[0002]

2. Description of the Related Art FIG. 6 is a front view showing a configuration example of a brake mechanism of a conventional elevator hoist. In the figure, 1 is a brake arm, 2 is a brake spring, 3 is a brake shoe, 4 is a fulcrum pin of the brake shoe 3, 5 is a brake drum, 6 is an electromagnet, and 7 is an L shape with a long side 7a and a short side 7b. The formed brake lever, 8 is a fulcrum pin of the brake lever 7, 9 is a bush attached to the short side 7b of the brake lever 7, 10 is a pressure bolt, and 11 is a fulcrum pin at the lower end of the brake arm 1.

In the above arrangement, the braking force of the brake is applied to the brake arm 1 by pressing the upper end of the brake arm 1 rotatably supported by the fulcrum pin 11 by the braking spring 2. It is transmitted to the supported brake shoe 3 via the fulcrum pin 4, and the brake shoe 3 is obtained by pressing the outer periphery of the brake drum 5.

On the other hand, this braking force is caused by the attraction force of the electromagnet 6, the pressing piece 6a is lowered, and the end 7c of the long side 7a of the brake lever 7 whose corner is rotatably supported by the fulcrum pin 8. And the brake shoe 3 attached to the short side 7b of the brake lever 7 pushes the end of the pressure bolt 10 attached near the brake spring 2 of the brake arm 1, and the brake supported by the brake arm 1 The shoe 3 is released by moving away from the brake drum 5.

In general, an elevator hoist includes an electromagnet 6
, The brakes 3 are separated from the brake drum 5 by the action of a roller to release the braking force, and then a car (not shown) suspended from the elevator hoist is moved up and down. Thus, when the car (not shown) reaches the destination floor, the excitation of the electromagnet 6 is stopped simultaneously with the stop of the elevator hoisting machine, and the brake spring 3 presses the brake shoe 3 against the brake drum 5 to reduce the braking force. Recover.

[0006] As described above, the brake mechanism of the elevator hoist is fail-safe. When the electromagnet is not excited, the braking force is held, and when the electromagnet is excited, the braking force is released.

On the other hand, the schematic configuration of the electromagnet 6 is such that when a coil 6c attached to the frame 6b is energized as shown in FIG. 7, a fixed iron core 6d fixed to the frame 6b and a pressing piece 6a are integrated. The movable iron core 6e is formed. The suction force Q acts on the gap G, and this action releases the braking force as described above.

FIG. 8 shows the characteristics. In the figure,
I ₁ , I ₂ and I ₃ indicate respective exciting currents. Point A indicates the required suction force at the initial stage of releasing the brake braking force, and point B indicates the required suction force after the release is completed. That is, since the upper portion of the brake arm 1 in the above-described configuration moves in the direction of compressing the brake spring 2, B> A. The exciting current is
Although the initial release of the point A requires a large exciting current I ₃ to the gap G is wide, because the gap G after release completion is narrowed from G ₁ to G _2, at point B the exciting current I ₃
A smaller excitation current I ₁ is sufficient.

However, with the exciting current I ₁ , no attractive force is generated at the point A, so that the rated current of the electromagnet 6 is determined by the exciting current I ₃ .

[0010]

FIG. 9 schematically shows the operation of the above-described brake mechanism. That is, F is the force of the brake spring 2 that applies the braking force, Q is the attraction force of the electromagnet that releases the braking force, l _{1 is} the distance from the lower end of the brake arm 1 to the stop of the brake shoe 3, and l is the center of the brake spring 2. the distance to the l _2, the distance to the center of the fixing bolt 10 and l _3, the distance l ₄ to the center of the support pin 8 and the fixing bolt 10 of the brake lever 7, similarly pivot pin 8 and the pressure if the distance to the center of the piece 6a and l _5, the suction force Q is calculated by the following equation by a lever ratio. Q = F (l ₂ · l ₄ / l ₃ · l ₅ ) From this equation, if l ₃ and l ₅ are increased, the ratio of the armature can be increased and the attractive force Q can be reduced.
Can be made compact.

However, the lengths of the brake arm 1 and the brake lever 7 are increased, and accordingly, the overall height H and the overall width W (both shown in FIG. 5) of the brake section are increased, and the size of the elevator hoist is increased. However, there is a disadvantage that the weight increases.

When l ₂ and l ₄ are reduced, the braking spring 2, the fulcrum pin 8 of the brake lever 7, and the pressure bolt 10 interfere with each other. Therefore, there is a limit in reducing their dimensions. Difficulties arise in reducing the force and making the electromagnet compact.

Meanwhile, if it is possible to reduce the initial suction force A shown in FIG. 8 to A ', the excitation current, the power consumption to become well I ₁ is small, it can be configured lightweight compact electromagnet, Until now, there was no friendly means and it was difficult to achieve.

In particular, in recent years, the elevator hoisting machine has been increased in capacity with the rise of buildings, and the brake mechanism has been inevitably increased in size. Therefore, a great deal of labor is required for loading into and installing the building. Therefore, there has been a strong demand for a smaller and lighter brake mechanism.

Therefore, an object of the present invention is to provide a light and compact brake mechanism for releasing a building even if the required braking force increases, without increasing the size of the brake mechanism.
An object of the present invention is to provide a brake mechanism for an elevator hoist that facilitates installation and the like.

[0016]

According to the first aspect of the present invention, a lever, which is swingably supported by an attraction force of an electromagnet, is operated, and a pressurizing body on which the force of the lever acts is integrally provided. For an elevator that releases a braking force by swinging an arm rotatably supported at an end remote from the pressurizing body and releasing a braking piece supported by the arm from a brake drum. In the brake mechanism of the hoist, the surface of the lever that contacts the end surface of the pressurizing body is an inclined surface.

According to a second aspect of the present invention, a lever, which is swingably supported by an attraction force of an electromagnet, is operated, and a pressure member on which the force of the lever acts is provided integrally with the pressure member. An elevator hoisting machine brake that releases a braking force by swinging an arm rotatably supported at a distant end and releasing a braking piece supported by the arm from a brake drum. In the mechanism, the lever is inclined and supported in advance with respect to the end face of the pressing body.

[0018]

According to the first aspect of the present invention, the distance between the fulcrum of the pressure member and the lever can be minimized, so that the attractive force of the electromagnet at the initial stage of releasing the braking force can be reduced. In addition, at the end of release, the distance between the pressure body and the lever fulcrum is larger than the initial stage, but the gap between the electromagnets (formed by the movable iron core and the fixed iron core) is small, so the attraction force of the electromagnet increases. I do. Therefore, the exciting current of the electromagnet can be reduced, the size of the electromagnet can be reduced, and the ratio of the arm and the lever to each other can be reduced, so that the brake mechanism can be reduced in size and weight. it can.

According to the second aspect, the same operation as that of the first aspect can be achieved, the exciting current of the electromagnet can be reduced, and the size of the electromagnet can be reduced. As a result, it is possible to reduce the ratio of the arms and levers to each other, so that the brake mechanism can be reduced in size and weight.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a partial front view showing an enlarged main part of the embodiment of the present invention.

In FIG. 1, 1 is a brake arm, 2 is a brake spring, 3 is a brake shoe, 4 is a fulcrum pin of the brake shoe 3, 5 is a brake drum, 6 is an electromagnet, 7 is a brake lever, and 8 is a brake lever 7 Reference numeral 10 denotes a pressure bolt, and reference numeral 11 denotes a fulcrum pin at the lower end of the brake arm 1.

As shown in FIG. 2, the brake lever 7 is pivotally supported at a corner by a fulcrum pin 8, and has a short side 7b.
A concave portion is provided at a position on the side surface portion facing the end surface of the pressure bolt 10, and a bush 12 is attached to this concave portion. The bush 12 has a surface 12a that comes into contact with the end surface of the pressure bolt 10 having an area larger than the end surface of the pressure bolt 10, and
The shape is inclined at an arbitrary angle θ so that the distance l ₄₁ between the outer edge of the end face 10 and the fulcrum pin 8 is minimized.

Next, the operation of the embodiment configured as described above will be described. When the electromagnet 6 is excited, the pressure side 6a presses the end 7c of the long side 7a of the brake lever 7, so that the brake lever 7 is moved clockwise around the fulcrum pin 8 by the action of the roller, as shown in FIG. Then, the bush 12 is rotated so that the pressure bolt 10 and the brake arm 1 are opened, and the brake shoe 3 interlocked with the brake arm 1 is separated from the brake drum 5 to release the braking force. In the course of such an operation, the bush 12 and the pressure bolt
The point of action with 10 is initially located at a distance l ₄₁ from the fulcrum pin 8, but when the brake lever 7 rotates, it moves following this rotation, and finally, a distance l ₄₁ greater than the distance l _{41 42}
To reach.

[0024] Since releasing the braking force this way, f ₁ (brake shoe 3 a force away from the brake drum 5 against the force of the damping spring 2) the force pushing the pressure bolt 10 in the initial release is pressurized Since the distance l ₄₁ from the fulcrum pin 8 to the point of action of the pressure bolt 10 and the bush 12 is shortest, the attraction force Q ₁ of the electromagnet 6 may be small, and the exciting current is reduced accordingly. Immediately before the end of the release, the distance l ₄₂ between the fulcrum pin 8 and the application point of the pressure bolt 10 and the bush 12 is equal to the distance l
Force f ₂ to press the long becomes pressurized bolt 10 compared to ₄₁ for a lever ratio than the f ₁ becomes smaller, f ₁ but greater force is required, the gap G of the electromagnet 6 as shown in FIG. 7 suction force Q ₂ is increased to is small, it is not necessary to increase the exciting current.

As described above, according to the present embodiment, in the characteristic diagram of the electromagnet shown in FIG.
Since it can be located at a point, it can be attracted with a smaller exciting current. This makes it possible to reduce the ratio of the armatures of the brake arm 1 and the brake lever 12 to each other, and to reduce the size and weight of the brake mechanism.

The present invention is not limited to the above-described embodiment, but can be variously modified. That is, the bush 13 attached to the brake lever 7 as shown in FIG.
The surface 13a that comes into contact with the end face of the pressure bolt 10 of the
May be used. With such an arc shape, the contact surface with the end surface of the pressure bolt 10 becomes smooth, and slidability during operation can be improved.

Also, as shown in FIG.
May be disposed at an angle θ with respect to the end face of the pressure bolt in advance, and even with such a configuration, the same effect as that of the embodiment in which the surface 12a of the bush 12 is inclined can be obtained. Can be

[0028]

As described above, according to the present invention, the lever, which is swingably supported by the attraction of the electromagnet, is operated, and a pressurizing body on which the force of this lever acts is provided integrally and the pressure is applied. An elevator hoist that releases a braking force by swinging an arm rotatably supported at an end away from the pressure body and separating a braking piece supported by the arm from a brake drum. In the brake mechanism of the machine, since the surface of the lever that contacts the end surface of the pressurizing body is an inclined surface, even if the required braking force increases,
The brake mechanism for releasing the braking force is not increased in size, and it is possible to provide a brake mechanism for an elevator hoist that is easy to carry in and install into a building as a lightweight and compact.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a partial front view showing a main part of one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing the operation of one embodiment of the present invention.

FIG. 4 is a front view showing a main part of another embodiment of the present invention.

FIG. 5 is a partial front view showing a main part of still another embodiment of the present invention.

FIG. 6 is a front view showing a brake mechanism of a conventional elevator hoist.

FIG. 7 is a configuration diagram of an electromagnet used for a brake mechanism of a conventional elevator hoist.

8 is a characteristic diagram of the electromagnet shown in FIG.

FIG. 9 is a front view schematically showing the operation of a brake mechanism of a conventional elevator hoist.

[Explanation of symbols]

1 Brake arm, 2 Brake spring, 3 Brake shoe, 5 Brake drum, 6 Electromagnet, 7 Brake lever, 9, 12, 13 Bush, 10 Pressure bolt.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66B 11/08 F16D 49/16 F16D 65/27 F16D 65/34

Claims (2)

(57) [Claims] 1. A lever, which is swingably supported by an attraction force of an electromagnet, is operated, and a pressure member on which the force of the lever acts is integrally provided, and is rotatable at an end remote from the pressure member. In the brake mechanism of the elevator hoist which releases the braking force by swinging the arm supported by the arm and releasing the braking piece supported by the arm from the brake drum, A brake mechanism for an elevator hoist, wherein a surface of the lever abutting on an end surface is an inclined surface. 2. A lever, which is swingably supported by an attraction force of an electromagnet, is operated, and a pressure member on which the force of the lever acts is integrally provided, and is rotatable at an end remote from the pressure member. In the brake mechanism of the elevator hoist which releases the braking force by swinging the arm supported by the arm and releasing the braking piece supported by the arm from the brake drum, A brake mechanism for an elevator hoist, wherein the lever is inclined and supported in advance with respect to an end face.