JPH038694Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a fall prevention device for various elevators and lifting devices.

(Prior Art) Conventional devices of this type have a structure in which a drum is attached to the shaft of a pinion that engages with a rack, and rotation is stopped by friction on the drum with a brake shoe. Therefore, the torque obtained is constant and is effective and sudden when the load is light and at low speeds, but the effectiveness becomes significantly worse when overloaded.

(Technical Problem) Therefore, the present invention is intended to solve the above problem, and its purpose is to prevent falling of elevators with variable torque, in which as the rotational force increases in proportion to the descending speed, the frictional force that can be used as a brake also increases. The goal is to provide equipment.

(Technical Means) In order to solve the above-mentioned problem, the present invention includes a vertical rack 1 disposed along the elevating path of the elevator;
The device body 4 has a device body 4 attached to an elevator and a gear 2 that meshes with the rack 1 at one end.
A rotary shaft 3 rotatably supported on the rotary shaft 3 is parallel to the rotary shaft 3 in the axial direction at the other end of the rotary shaft 3, and rotates integrally with the rotary shaft 3 when the number of rotations of the rotary shaft 3 is within a set range. a pair of friction disks 5 and 6, a base 19 disposed between them, and a wing 7 that is pivotally supported by the base 19 and expands due to centrifugal force when the rotation speed exceeds a set range; A casing 8 that surrounds the discs 5 and 6 and is rotatably attached to the main body of the device and rotates by engaging with the expanded wing end, and a casing 8 that is provided around the casing and engages with the rotating casing to stop it. The one disc 5 approaches the other disc 6 due to the relative rotation generated between the rotating means 35, 36 and the rotating shaft 3 that continues to rotate,
One disc 5 and the rotating shaft 3 are connected so that the frictional force increases.
In this embodiment, the screw means 9 and 10 are provided between the screw means 9 and 10.

(Function of the invention) In the device of the present invention, a pair of friction disks 5 and 6 are attached to the rotating shaft 3 having the gear 2 that meshes with the rack 1. In other words, if the rotating shaft rotates to the left when the main body is lowered, since it is screwed to the rotating shaft 3 due to the right-hand thread, if one of the friction disks 5 stops rotating, the rotating shaft 3 continues to rotate. As a result of the rotation of the friction disk 6, the frictional force increases as the rotational speed increases.

(Example) To explain the following using an illustrated example, the device main body 4
A rotating shaft 3 is supported via bearings 11 and 12, and has a gear 2 at its tip, which engages with a rack 1 when an elevator or the like is lowered. 13 is empty, 14,1
Reference numeral 5 indicates a retaining ring, 16 indicates a member for connecting the elevator or the present device, and 17 indicates a connecting bolt. A pair of friction disks 5 and 6 are attached to the rear end of the rotating shaft 3, and one of the disks 5 has a female threaded portion 10 that is screwed into a reverse threaded portion 9 of a screw means formed on the outer periphery of the end of the rotating shaft. The other disk 6 is fitted into the thick shaft portion 18 in front of it, and the disk 6 is rotatably incorporated into the main body 4 by the aforementioned bearing 12. Therefore, the other disk 6 can freely rotate at a fixed position on the rotating shaft, and the one disk 5 changes its position on the axis by rotating relative to the rotating shaft 3. A base 19 having wings 7 is disposed between both discs 5 and 6, and the base 19 is fitted into the base cylinder of one of the discs 5. Two arc-shaped wings 7, 7 are symmetrically attached to the center of the base 19 and are swingably mounted on a shaft 20, and both wings 7, 7 are operated synchronously by a continuous member 21. Further, a mounting pin 23 of a positioning member 22 is pivotally supported on one side of the wing 7, and a coil spring 24 pulls the wing 7 against centrifugal force to determine the load and position at the start of operation. Reference numeral 8 denotes a casing that is engaged with the tip of the wing when it is expanded, and the engagement partner in this embodiment is the edge of the hole 25. 26 and 27 are linings provided on the sides facing the wings of both discs 5 and 6, 28 is a retaining collar for attaching one of the friction discs 5 to the end of the rotating shaft, and 29 is a lining that is attached to the collar through a spring washer 30. 31 is a pressing element having a ball 32 that presses against the circumferential surface of the casing 8; 33 is its pressing spring;
34 is a concave groove into which the ball 32 engages; 35 is an arm protruding from the periphery of the casing; and 36 is an arm stop; these arms 35 and the stop 36 constitute stopping means for the casing 8. 37 is a stopper, and 38 is a nipple.

In the above, when elevator A starts descending,
As long as the rotating shaft 3 rotates via the gear 2 meshing with the rack 1 and descends at a predetermined speed, no change will occur in the present device. However, when the descending speed exceeds the set value, the wings 7, 7 expand due to centrifugal force and lock onto the hole edge 25 of the casing 8, causing the entire casing 8 to rotate in the direction of rotation of the rotating shaft 3. When the arm 35 on the casing circumferential surface collides with the arm stop 36 on the main body 4 and the rotation of the casing 8 is stopped (Fig. 3), the friction disk 5 due to the reverse thread
spirally advances toward the other disk on the rotating shaft 3 and pressurizes the linings 26 and 27, so the pressure contact between the two disks and the wing 7 and its base increases, and eventually the rotating shaft 3
This will stop the rotation of the

(Effect of the invention) Therefore, according to the invention, when a brake is applied to the rotation of the rotating shaft 3, the friction disk 5, which is rotatably attached to the rotating shaft 3 by the screw means 9 and 10, is rotated by inertia. The lowering of the main body 4 is stopped by the braking action that pinches the base 19 provided with the wings 7, which are expanded and fixed to the main body side due to excessive rotational speed, between the other friction disk 6.
As the rotational speed, that is, the descending speed of the rotating shaft 3 increases, a braking force with a correspondingly large torque can be automatically generated to stop the rotating shaft 3, thereby achieving the effect of providing safe and reliable braking action.

[Brief explanation of the drawing]

The drawing shows one of the fall prevention devices for elevators according to the present invention.
Embodiments are shown, and FIG. 1 is a sectional view, FIG. 2 is a sectional view, and FIG.
FIG. 3 is an explanatory inner view showing the operating state, and FIG. 4 is a front view showing the relationship with the elevator. 1... Rack, 2... Gear, 3... Rotating shaft, 4
... Device body, 5, 6 ... Friction disk, 7 ... Wing, 8 ... Casing, 9, 10 ... Screw means, 19 ... Base, 35, 36 ... Stop means.

Claims (1)

[Scope of utility model registration request] A vertical rack 1 arranged along the lifting path of the elevator, and a device main body 4 attached to the elevator.
and a rotating shaft 3 which has a gear 2 at one end that meshes with the rack 1 and is rotatably supported on the device main body 4.
and are paralleled in the axial direction at the other end of the rotating shaft 3,
When the rotation speed of rotating shaft 3 is within the setting range, rotating shaft 3
A pair of friction disks 5 and 6 that rotate integrally with the base plate 19 and a base plate 19 disposed between them;
a wing 7 that is pivotably supported by the rotation speed and expands due to centrifugal force when the rotational speed exceeds a set range; and a wing end that is rotatably attached to the device body surrounding both discs 5 and 6 and expands Due to the relative rotation generated between the casing 8 that is locked and rotates, the means 35 and 36 provided around the casing that engages with and stops the rotating casing, and the rotating shaft 3 that continues to rotate, the above-mentioned Fall prevention for an elevator constituted by screw means 9, 10 provided between one disk 5 and the rotating shaft 3 so that one disk 5 approaches the other disk 6 and the frictional force increases. Device.