JPH0443548Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an emergency braking device for a gondola used when cleaning building windows.

[Conventional technology and its problems]

A gondola suspended from the roof of the building is used to clean the exterior walls and window glass of the building. The gondola is raised and lowered by a wire winding drum installed on the roof of the building, and the gondola is suspended by the wire wound around the drum. When the gondola is hoisted, stopping at any position is achieved by a braking device installed on the drum or a motor with a brake. However, in the event of damage to the gear group that drives this drum by the motor, failure of the motor, failure of the braking device, etc., it is mandatory to install a means to perform an emergency stop. Conventionally, this emergency stop is performed by braking a brake band provided on the wire winding drum using an electromagnetic brake. However, this device has a complicated structure, is large, expensive, and requires a power source for emergency stop. To improve this problem, there is a method of applying a mechanical emergency stop as disclosed in Japanese Utility Model Application Publication No. 56-88774 and Japanese Utility Model Application Publication No. 48-114524.

The purpose of this invention is to operate an emergency stop more reliably and quickly with a simple mechanical structure.

[Means to solve the problem]

The present invention was developed to achieve the above object, and a brake band is attached to the outer periphery of one end of the wire winding drum in a state in which it is always tightened, and a plurality of locking claws protrude from the outer periphery of the brake band. The brake band is rotated together with the drum, and a governor mechanism is disposed adjacent to the drum, and the governor mechanism is rotated in synchronization with the drum through a power transmission means between the drum and the governor mechanism. A hook was provided so that when the governor reached a set speed, the hook was kicked by the governor to release the locking pawl, and a spring energized the locking pawl caused the locking pawl to contact the stopper and tilt. The gist is that the tip of the locking pawl comes into contact with a locking pawl protruding from the outer circumferential surface of the brake band to forcibly stop the drum.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, 1 is a gondola trolley installed on the roof of a building so that it can run freely.A boom 2 that can be raised and lowered is protruded from this trolley 1, and a wire W for hanging the gondola G is attached to a sheave S provided at the tip of the boom. The proximal end of the wire W is wound onto a wire winding drum D provided on the trolley 1, and the gondola G is raised and lowered by winding and unwinding the wire W.

A gear 3 is fixed to one end of this drum D as shown in FIG. By selectively driving the reverse direction, the wire is wound and unwound, and the gondola G is raised and lowered.

Further, a brake drum 5 is fixed to the other end of the drum D, that is, the end opposite to the gear 3, so that the brake drum 5 rotates together with the drum D. Further, a sprocket wheel 6 is provided at one end of the drum D, and a chain 8 is stretched between the sprocket wheel 6 and the sprocket wheel 7 of the emergency brake device A to increase the rotational speed of the drum D to that of the emergency brake device A. Communicate quickly.

This emergency brake device A is shown in detail in FIGS. 3 and 4. A sprocket wheel 7 is rotatably supported on a frame F by a bearing 9, and a gear 10 is coaxially mounted on the sprocket wheel 7.
is fixed, and this gear 10 is made to be able to increase speed, and gear 1
Engage 1.

This gear 11 is fixed to a shaft 13 supported by a bracket 12 protruding from the frame F, and this shaft 13 is further provided with governors 14, 14, and when the gear 11 rotates, the governor 14 also rotates. It's becoming like that. And this governor 14
The governor 14 is adjustable and supported by an adjustment spring 15 so that the governor 14 does not protrude in the direction of its outer circumference until a certain rotational speed is reached. The two governors 14 are each supported by a governor frame 17 via a support shaft 16, and when a predetermined torque is reached, each governor 14 swings around the support shaft 16, and the governor protrudes in the direction of its outer circumference. Do what you want.

Further, an L-shaped hook 19 is swingably supported on the bracket 12 via a shaft 18, and a spring 20 is applied to the hook 19 so that the hook 19 is locked to a pin P protruding from a lock pawl. In addition, a claw 19a provided at one end of the hook 19 is protruded at a position where it contacts the governor 14 at the set speed.

Reference numeral 20 denotes a lock pawl, which is swingably provided on the frame F through a shaft 21 so as to tilt toward the drum side, and a pin P is provided protrudingly from a part of the lock pawl 20, and this pin is latched to the hook 19. When the locking claw 20 is in the upright position, the locking pawl 20 remains in the upright position. This lock pawl 20 is provided with a spring 22, and the hook 19
When the locking pawl 20 is removed from the pin P, the lock pawl 20 is instantly tilted toward the drum D by the action of the spring 22. A stopper 22 is provided on the frame F so that when the lock pawl 20 is tilted, the lock pawl is fixed at a predetermined angle to support the load applied to the lock pawl. The lock pawl 20 faces the brake drum 5 fixed to the drum D on the outer peripheral surface thereof.

A brake band 23 having a brake lining fixed thereon is attached to the brake drum 5, and the brake band 23 is fixed onto the brake drum 5 in a state in which the required braking is applied. This is fixed with bolts with the brake band tightened in advance. On the outer peripheral surface of the brake band 23, locking claws 24, 24, . . . are provided protrudingly at predetermined intervals. The locking claw 2 in which any one of the locking claws 24 is tilted
Make it lock with 0.

Therefore, in the gondola constructed as described above, during normal operation, the drum D is driven by the motor to rotate forward or reverse at a preset rotation speed.
At this set rotational speed, the governor 14 is set not to operate even if it is also rotated, so the hook will not be kicked even when the governor rotates. Therefore, the lock pawl 20 remains in an upright state and is not locked with the lock pawl 24 of the brake band, and the brake band rotates together with the drum D with the brake drum tightened.
However, when the gondola G, which has been suspended due to damage to the gears 3 and 4 other than the wire breakage, begins to descend at a speed higher than the set speed due to its own weight, the drum D is accelerated to a speed higher than the set speed. The acceleration of drum D is transmitted to gear 1 of the emergency brake system via chain 8.
0 and 11, the governor 14 rotates at an increased speed. At this time, the governor 14 whose rotational speed exceeds the set rotational speed swings and rotates so as to protrude toward the outer circumference due to the rotational torque. As a result, the pin 19a of the hook 19 is kicked by this protruding governor. When the hook 19 swings around the shaft 18, the pin P that was locked on the hook 19
is off the hook. As a result, the lock pawl 20 is tilted steeply toward the drum D by the action of the spring 22.
The brake band is engaged with a locking pawl 24 of a brake band rotating together with the drum D, and the drum D is suddenly braked and stopped via the brake band fixed to the drum.

In addition, 25 in the drawing is a limit switch and other sensors. When the limit switch is in contact with the lock pawl, the motor can be driven, but when the lock pawl tilts and this is detected by the limit switch, the power supply to the motor is immediately stopped. be.

[Effects of the invention] According to the invention, the brake band is attached to the wire winding drum in a constantly tightened state so that it rotates together with the drum, and the rotation of this drum is transmitted to the governor, so that the governor adjusts to the set torque. When the brake band is reached, the locking pawl is released and the locking pawl is used to lock the protrusion protruding on the outer circumferential surface of the rotating brake band, so it can be used instantly and with a simple device, and can be used to cut other than wire rope. This has the advantage of reliably preventing the gondola from descending when the gondola breaks down.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall outline of the gondola, FIG. 2 is a plan view of the wire winding drum section, FIG. 3 is a front view of the main part, and FIG. 4 is a side view of the same. D is the wire winding drum, 5 is the brake drum, 14 is the governor, 19 is the hook, P is the pin, 2
0 is a lock pawl, 23 is a brake band, and 24 is a lock pawl.

Claims (1)

[Scope of utility model registration request] A brake band is always attached to the outer periphery of one end of the wire winding drum, and a plurality of locking claws are provided protruding from the outer periphery of the brake band so that the brake band rotates together with the drum. A governor mechanism is disposed adjacent to this drum, and the governor mechanism is rotated in synchronization with the drum through a power transmission means between the drum and the governor mechanism, and when the governor reaches a set speed, a kick is applied to the governor. A hook is provided to release the locking pawl when the stopper is pressed, and the tip of the locking pawl protrudes from the outer peripheral surface of the brake band only when the locking pawl comes into contact with the stopper and tilts due to the spring applied to the locking pawl. An emergency brake device for gondolas that forcibly stops the drum when it comes into contact with the locking pawl.