JPS5943649B2 - Cage centrifugal brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A cage that can be raised and lowered along a rack fixed vertically to a wall is known.

A pinion shaft with a fixed pinion that engages with the rack is supported by a cage.In most cases, this pinion shaft is driven by a prime mover mounted on the cage. The present invention relates to a centrifugal brake device that can instantaneously react and brake when a change in acceleration occurs in a car that is slowly descending. The phase allows it to self-balance and eliminate the influence of gravity. Examples will be described with reference to the drawings.

A drum 1 is fixed to a cage C that can be raised and lowered along a rack (not shown). The pinion shaft 2 passes through the center of the drum, is rotatably supported by the cage C, and has a pinion (not shown) fixed thereto that meshes with the rack. Disk 3
is fixed to the pinion shaft 2, and a pair of pins 3a are implanted at diametrically symmetrical positions. The pair of shoes 4 are each pivotally connected to the pin 3a at the head thereof, and are housed in such a manner that the head of one follows the tail of the other.

There is a gap between the head and the drum. Only the tail can come into contact with the drum and is provided with a notch 4a there. The center of gravity of the shoe is in the part of the tail part away from pin 3a. equal length 1
Both ends of the pairs of links 5 are pivotally connected to the tail of one shoe and the head of the extending shoe, so that each pair of shoes and links can move in a parallelogram manner. A pair of springs 6 are each latched at one end to the disc 3 and at the other end to a portion of the shoe or link, and are biased to pull the tail of the shoe away from the drum.

The spring force of the spring 6 is set so that the shoe 4 does not operate at a slow rotation speed during normal operation of the cage, but operates only when the shoe 4 rotates at a higher rotation speed. The present invention is configured as described above.

In FIG. 2, it is assumed that the pinion shaft 2 rotates in the normal direction (clockwise) when the cage is raised, and rotates in the reverse direction when the cage is lowered. During forward rotation, the speed is forced to be low because the cage load is lifted, and the shoe and drum do not come into contact with each other, so there is no problem with upward movement. When a change in acceleration occurs in the cage that is gently descending, the spring 6 acts sensitively on even a small change in centrifugal force, causing the tail of the cage to expand outward, coming into frictional contact with the drum and braking the descent. At this time, a large reaction force is applied to the pin 3a, so if necessary, a reaction force receiving protrusion 2a is provided on the outer periphery of the pinion shaft as shown in FIG. Japanese Unexamined Patent Application Publication No. 48-1989-1 is similar to the present invention.
67947 and Utility Model Publication No. 49-30715.

However, the former has only one link corresponding to the link 5 of the present invention. That is, the influence of uneven load due to providing a link only on one side of the central axis cannot be avoided. The latter also lacks anything equivalent to link 5. In either case, the operating parts are unable to self-balance, and cannot respond sensitively to minute changes in acceleration. On the other hand, in the present invention, since each pair of shoes and links having the same weight and shape move in a parallelogram, the influence of gravity on the two shoes is canceled out through the link 5, and the angular phase of the bill axis 2 is To make the outer expansion of the shoe uniform, regardless of the

The spring force of the spring 6 determines whether to brake at high speed or low speed. By appropriately selecting the spring 6, stable braking can be achieved at a predetermined rotational speed. This is a feature of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a side view of the present invention, and FIG. 2 is a front view thereof. 1...Drum, 2...Pinion shaft, 2
a...protrusion, 3...-disc, 3a...
...Pin, 4...Shuttle 4a...Notch, 5...Link, 6...Spring, C.
·····cage.

Claims (1)

[Claims] 1 In a cage that can be raised and lowered along a vertical rack, there is a drum fixed to the cage body, a horizontal pinion shaft to which a pinion that engages with the rack is fixed and rotatably passes through the drum, and a symmetrical pair fixed to the pinion shaft. A disc having a pin implanted therein, and a disc having a center of gravity at the tail part, which is pivoted to the pin of the disc at the head part, and is spaced at an appropriate distance from the pin, so that the tail part can come into contact with the inner surface of the drum. a pair of shoes, a pair of links whose ends are pivotally connected to the head of one shoe and the tail of the other shoe, respectively, to enable the shoes to move in a parallelogram; A centrifugal brake for a cage, comprising a spring with a weak spring force energized to pull the tail part away from the drum, and the shoe is oriented in a retracting direction so that the head of the shoe is at the beginning of rotation when the cage rises. Device.