JPS6035800Y2 - braking device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a braking device.

BACKGROUND OF THE INVENTION Conventionally, for example, a dehydrator braking device for a washing machine is linked with the opening/closing operation of a dehydrating tank lid 1, as shown in FIG.

That is, the dehydration tank M1 is pivoted at a fulcrum 2 so that it can move up and down as shown by the arrow, and from this fulcrum 2 the switch box 4
A lever 5 that can be slid up and down with an arm portion 3 that extends inward.
The lever 5 is connected to a brake lever 7 via a wire 6 provided at the lower end.

As shown in FIG. 2, the brake lever 7 is rotatably supported on a motor plate 9 fixed to the upper peripheral side of the motor 8 at a fulcrum 10 at one end, and the free end is supported by a tension spring provided on the motor plate 9. 11, the brake wheel 12 is coaxially driven by the motor 8 and is biased toward the curved side of the brake wheel 12, and the wire 6 pulls the free end of the brake lever 7 against the biasing force of the spring 11. They are connected so that they can be pulled or loosened in the opposite direction, that is, in the direction of separation.

13 is a dewatering unit supported on the shaft of the brake wheel 12 passing through the dehydrating tank 14.

Brake wheel 12 on the free end side of the brake lever 7
A brake shoe 15 is fixed to the surface facing the brake lever 12 by engaging with an engagement hole 17 of the brake lever 12 with a claw 16.

When the full dehydration tank lid 1 is opened upward from the closed state shown in FIG. Relax.

The brake lever 7 is moved to the second position by the biasing force of the tension spring 11.
It rotates from the brake release position shown by the imaginary line A in the figure to the brake position shown by the solid line.

At this time, the tip of the brake shoe 15 located on the free end side of the brake lever 7 comes into contact with the circumferential surface of the brake wheel 12 rotating in the direction of the arrow, and the rear end and the brake wheel 12
The brake starts to be applied while there is a slight gap 18 between the brake shoe 15 and the circumferential surface of the brake wheel 12.However, since the brake wheel 12 is still rotating quickly, the brake shoe 15 is wrapped around the circumferential surface of the brake wheel 12 so as to be caught in the direction of rotation. At the same time, the force caused by this biting causes the brake shoe 15 and the brake lever 7 to deform into a shape that follows the outer circumference of the brake wheel 12, and as shown in FIG. There is no gap with the brake wheel 12.

When the rotation of the brake wheel 12 decreases, it returns to the state shown in FIG. 2 and comes to a complete stop.

When the dehydration tank lid 1 is closed, the brake lever 7
is rotated from the brake position shown by the solid line in FIG. 2 to the release position shown by the imaginary line A, and when the timer 19 of the switch box 4 is turned to turn on the switch, the dewatering cylinder 13 is rotationally driven by the motor 8.

According to such a conventional braking device, the brake shoe 1
The part where the biting force on the brake wheel 12 of No. 5 is most strongly applied is the tip, so this part is most likely to wear out, and the gap between the rear end and the brake wheel 12 disappears, immediately after the brake is applied. brake shoe 15
It tends to become sticky.

In this case, the biting force of the brake shoe 15 becomes weaker, resulting in a disadvantage that the braking time becomes shorter.

This invention was made to eliminate these drawbacks,
The objective is to propose a braking device that reduces wear on the brake shoes and does not change the biting force.

That is, in the braking device of the present invention, the structure of the brake shoe attached to the brake lever in the conventional example has been improved, and the brake shoe is rotatably supported at one end and the free end is biased toward the circumferential surface of the brake wheel. The brake lever is characterized in that an elastic body is interposed between the brake lever and the brake lever free end portion of the brake shoe attached to the brake lever.

The embodiment will be described below with reference to FIGS. 4 and 5.

In the figure, the same reference numerals are given to the same part names as in FIGS. 1 to 3.

As shown in FIGS. 1 to 3, the brake lever 7 is rotatable about a fulcrum 10 at one end on a motor plate 9 fixed to the upper circumferential side of a motor that rotationally drives a dehydrating tube in a washing machine dehydrating tank. The free end is supported by a tension spring 11 provided on the mo plate 9.
The brake wheel 12 is connected to the peripheral surface of the brake wheel 12, which is coaxial with the motor that constantly rotates in the direction of the arrow, so that it is biased to the brake position and also applies a tensile force in the opposite direction to the wire 6 connected to the dehydration tank lid. The brake lever 7 brakes or releases the brake wheel 12 in conjunction with the opening/closing operation of the dehydration tank lid.

This brake lever 7 is curved along the circumferential surface of the brake wheel 12, and the brake shoe 15 is attached to the tip of the brake lever 7, that is, the surface facing the circumferential surface of the brake wheel 12 on the roadside side. Matching hole 1
It is fixed by a pawl 16 that engages with 7.

A gap is provided between the brake lever 7 and the distal end portion of the brake shoe 15 along the free end side of the brake lever 7 from the approximate center thereof, and an elastic body 20 made of synthetic resin or the like is interposed therebetween.

In the above configuration, when the dehydration tank lid is opened, the wire 6 is loosened, and the brake lever 7 is rotated by the biasing force of the tension spring 11 from the brake release position shown by the imaginary line in FIG. 4 to the brake position shown by the solid line. The tip of the shoe 15 comes into contact with the circumferential surface of the brake wheel 12 rotating in the direction of the arrow to apply the brake.

At this time, the pressing force on the tip of the brake shoe 15 is alleviated by the intervention of the elastic body 20, and wear and tear on the tip of the brake shoe 15 due to friction is greatly reduced.

Next, as shown in FIG. 5, as the brake wheel rotates, the brake shoe 15 bites into the circumferential surface of the brake wheel 12 so as to be caught in the direction of rotation, and at the same time, the elastic body 20 is compressed by this force, and the brake shoe 15
The brake lever 7 is deformed to follow the outer circumference of the brake wheel 12, and the gap 1B between the rear end of the brake shoe 15 and the brake wheel 12 disappears.

When the brake wheel 12 comes to a standstill, it returns to the state shown in FIG. 4 and comes to a complete standstill.

In the above-mentioned embodiments, a brake for a single block was described, but the brake for a double block may be similarly applied.

According to the braking device of the present invention, there is a brake lever that is rotatably supported at one end and whose free end is biased toward the circumferential surface of the brake wheel, and a brake shoe attached to the brake lever that has the highest pressure contact force. Since an elastic body is interposed between the free end of the brake lever and the free end of the brake lever, elasticity is generated in the pressure contact force applied to this part of the brake shoe during braking, and the rotational force of the brake wheel is increased until the brake shoe is fully pressed. Since it is distributed over the entire pressure contact surface of the brake shoe without being concentrated in this area, the wear does not become uneven and the brake shoe lasts for a long time.

In addition, if the brake wheel comes to a near standstill, even if the brake shoe lifts up at the rear end, the elastic force of the elastic body at the tip will bring the brake wheel to a complete standstill, reducing changes in braking time due to the number of durability cycles. This allows for smoother braking operation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the washing machine, FIGS. 2 and 3 are views taken along the line A-A in FIG. 1, and FIGS. 4 and 5 are top views of essential parts showing an embodiment of the present invention. . 6... Wire 7... Brake lever 10... Fulcrum, 11... Tension spring, 12... Brake wheel, 15... ... Brake shoe 20 ... Elastic body.

Claims (1)

[Scope of utility model registration request] a brake lever that is rotatably supported at one end, urges the roadside toward the peripheral surface of the brake wheel, and has a brake shoe attached to the free end that contacts the brake wheel from its tip side; A braking device characterized in that an elastic body is interposed between the brake shoe center and a free end side portion of the brake lever.