JPH05106658A - Double centrifugal cam type low speed device with brake at no-power time - Google Patents

Abstract

PURPOSE:To provide a stable output dropping speed by a brake regardless of a level of the body weight. CONSTITUTION:A fixed speed centrifugal brake device is constituted of two pairs of large and small centrifugal cams 16, 17, spring 18 connected between a pair of centrifugal cams 17, internal peripheral wall 15, external peripheral wall 19, rotary shafts 16a of the cams 16, 17 and an output disk 20 of loading the internal peripheral wall 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant speed centrifugal brake device, and more particularly to a double centrifugal cam type constant speed device with a non-powered brake (DCNPB).

2. Description of the Related Art The present inventor first fixed one end of a strong rope, that is, a lifeline, and then provided a centrifugal brake structure through a gear mechanism to a drum around which the lifeline was wound. We proposed a portable emergency constant speed lowering device that is convenient to carry by attaching a handle, a safety belt, and a manual brake to the aircraft.

The construction is shown in FIG. 3, but in brief description, there is a durable rope, that is, a drum 2 around which a lifeline 1 is wound by an appropriate length, and one end of the lifeline 1 is used for the interior of a room. The metal fitting 8 for fixing to the fixed portion is fixed.
Further, the gear 3 having the shaft 2a of the drum 2 as an axis, the gear 3'which meshes with the gear 3, the gear 4 coaxial with the gear 3 ', and the third gear 4'having teeth which mesh with the peripheral teeth of the gear 4 and the like. The gear mechanism G including the gear group of is interposed. Further, a disc 9 is attached coaxially with the gear 4 ', and a pair of eccentric cams 6 are attached to the disc 9.
The eccentric shafts are rotatably fixed while a and 6b are mounted. Reference numeral 7 denotes a machine body, and the eccentric cams 6a, 6b constitute a brake device B with a cylindrical wall 7a and a disk 9 which serve to press the top which is going to expand due to the centrifugal force accompanying the rotation.

Therefore, when there is a fire in a high-rise building, after opening the window, the hook metal 8 is hooked on a part of the room and firmly fixed so as not to move, and then the handle 7b of the machine body 7 is held.
When you grab and jump from the window, lifeline 1 will be pulled by the weight of the person and stretch out. During this time, the lifeline 1 is pulled and the lifeline 1 wound around the drum 2 is unraveled and the rotation of the drum 2 is caused by rotation of the shaft 2a, gears 3, 3 ', 4,
The gear mechanism G of 4'is transmitted to the shaft 5, and the disc 9 is rotated according to the direction of the hanging on the lifeline 1. Due to this rotation, the tops of the eccentric cams 6a and 6b spread about their respective axes,
The brake comes into contact with the peripheral cylindrical wall 7a, and the rotation is braked according to the contact force. In other words, the descent speed is suppressed,
The braking force according to the person's eyes works to control the descent speed, and it is possible to prevent accidents caused by a sudden descent. In the figure, 10 is a safety belt, 11 is a manual brake,
Reference numeral 12 is a slack preventing piece, and 13 is a slack preventing stopper that presses the lifeline 1 wound around the drum 2 so as not to slacken, preventing irregular winding and helping a smooth descent.

[0004]

However, since such a centrifugal brake utilizes the frictional force with one outer wall portion which is received by the change of the rotational force of the pair of centrifugal cams, the force for rotating the centrifugal brake,
Here, since the rotational force to be obtained cannot be set in advance depending on the size of the body weight, it was designed by controlling the average value of the rotational friction, and a stable descending speed could not be obtained when the body weight was extremely large or small. Immediately after the descent, the sudden pulling force applied during the moment when the frictional control is performed by the rotational force may damage the lifeline or the gear.

[0005]

In consideration of the above points, the present inventor has made various trial manufactures and repeated experiments, and as a result, the cylindrical outer peripheral wall 10 by the upper and lower two-stage cams 16 and 17 of two pairs of large and small.
It is stable by the structure that three different frictional forces are generated by two different rotational frictions and the structure in which the springs 18, 18 are connected between the large cams 17 on one side, and by tightening friction on the cylindrical shaft 15 of the inner peripheral wall. This enables the descent speed.

[0006]

Thus, by using the descending device including the braking device of the present invention in a high-rise building or the like and taking it out in case of emergency itself, both a light-weight person and a heavy person can stably descend at a constant descent speed. You can descend with. The braking device of the present invention improves the variation in speed control due to the magnitude of the applied force in the conventional centrifugal braking device, and realizes stable control capability at a predetermined constant speed. It can be widely applied in the fields that require.

[0007]

1 is an exploded perspective view of a brake device according to the present invention, and FIG. 2 is a top view of the same. In the figure, 15 is a cylindrical shaft that forms the inner peripheral wall of the brake device, and 16 and 17 are the cylindrical shaft 1.
The first and second small and large upper and lower centrifugal cams 18 are rotatably attached to the shaft 16a with 5 sandwiched therebetween.
Is a spring connecting the centrifugal cams 17, 17, and 19 is an outer peripheral wall of the brake device surrounding the centrifugal cams 17, 17. In addition, 20 is transmitted by the rotation of the lifeline 1, centrifugal cam 1
It is a disk that works to open frames 6 and 17. It can be considered that the brake device having such a configuration is replaced with the brake device B of FIG.

Next, the operation of this brake device will be described. When the minimum force for pulling the lifeline 1 lightly from the state without rotation is applied, the inner peripheral wall 15 of the rotary bearing clamped by the cam 17 by the two springs 18, 18 is used. The disc 20 is lightly brake-controlled, and when the next pulling force is small, only the small cam 16 spreads even with a small centrifugal force to obtain the spreading friction to the outer peripheral wall 19 and the subtle rotation change together with the tightening friction by the cam 17. When the pulling force is medium, the small cam 16 receives a large centrifugal force to generate a large frictional force, and the cam 17 is urged by the spring 18 to generate a large frictional force from a small tightening friction on the inner peripheral wall. Outer wall 19 that gains strength
The rotation is controlled by the upper and lower two cams with a proper spreading friction. When the pulling force is large, the cam 16,
17 receives a large centrifugal force and is further applied with a frictional force, and controls the rotational force of the disk 20. Even when the pulling force changes in magnitude, due to the difference in centrifugal force received by the upper and lower two pairs of cams, a continuous constant change in friction is applied to the upper and lower outer peripheral walls and the inner peripheral wall at three points to achieve stable rotation at a constant speed. Can be obtained.

[0009]

As described above, in the conventional centrifugal brake, the rotation speed of the output disk of the brake device was changed and the constant output speed could not be obtained due to the pulling force, that is, the size of the body weight, but the brake device according to the present invention. Then, a pair of large and small brake cams 17 and 16 and a pair of springs 18 are combined to change the contact friction between the outer peripheral wall 19 and the inner peripheral wall 15 to obtain a stable rotation speed, regardless of the weight. It is possible to control the output speed at a constant rotation speed.

[0010]

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a braking device according to the present invention.

FIG. 2 is a top view of the braking device according to the present invention.

FIG. 3 is a simplified perspective view of the brake device previously proposed by the present inventor.

[Explanation of symbols]

 15 Cylindrical shaft forming inner peripheral wall 16 Smaller first cam 16a Rotating shaft of cam 17 Larger second cam 18 Spring 19 Outer peripheral wall 20 Output disk

Claims (1)

[Claims] 1. A cylindrical shaft 15 forming an inner peripheral wall, two first eccentric cams 16 having a rotary shaft 16a sandwiching both sides of the cylindrical shaft 15, and two eccentric cams 16 coaxial with each other. Second
Eccentric cam 17, a spring 18 connecting the two eccentric cams 17, a cylindrical outer peripheral wall 19 surrounding the eccentric cams 16, 17, the pair of shafts 16a and the cylindrical shaft 15
And a disk 20 for supporting the cylindrical shaft 15
A double centrifugal cam type low speed device with a non-powered brake, which has a stable rotational speed when an external rotational force centering on the disk 20 is applied to the disk 20.