JPS6027722Y2 - Safety devices for personnel and cargo transport carts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved safety device for carts for transporting personnel and cargo.

Conventionally, the safety device used in carts for transporting people was to remove the clutch locking device, engage the clutch, and activate the brake device in conjunction with cutting the rope pulling the cart. (Patent No. 11045)
3).

However, since the above-mentioned device is a safety device that is activated by cutting the rope, no safety measures have been taken to overcome failures or erroneous operations of the rope traction device, which are one of the causes of cart descent accidents.

Therefore, even in case of abnormal operation of the traction device as mentioned above,
In order to be able to stop the cart safely, a safety device has been installed in which the brake device can be operated even on the trolley of the cart (Jet M No. 50-9733).

That is, as shown in FIGS. 1 and 2, this safety device is provided with a clutch (described later) attached to a rotating shaft 4a of a wheel 4 of the cart 3, which runs on a rail 1 while being pulled by a rope 2. A shaft 5 interlocked via a means is provided, and a right-hand thread 501 and a left-hand thread 502 are provided at both ends of the shaft 5, respectively.
Brake shoes 6 and 6', whose lower ends are opposed to each other so as to sandwich the rail 1, are screwed together.

The shaft 5 is provided with a driving part clutch 7 and a driven part clutch 8. The driving part clutch 7 is rotatably supported by the shaft 5, and the driven part clutch 8 is provided with a key provided on the inner peripheral surface. It fits into a key 9 fixed to the shaft 5 through a groove so as to be slidable in the axial direction.

These driving part clutch 7 and driven part clutch 8 are normally separated by a locking plate 10.
When the driven part clutch 8 is released, the driven part clutch 8 is biased by the repulsion spring 11 and engages with the driving part clutch. power is transmitted to the shaft 5.

Thus, the locking plate 10 can be released by pulling a handle 14 provided inside the cart.

According to such a safety device, if there is a delay in pulling the handle 14, the cart will descend and the distance it will take to stop will be longer.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a safety device for a cart for transporting personnel and cargo, which can improve safety.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

FIG. 3 is a conceptual cross-sectional view in which the same parts as in FIG. 2 are denoted by the same reference numerals.
and the shaft 5 with the left-hand thread 502 symmetrically screwed is the bearing 15
It is supported at the bottom of the trolley 3 via the right-hand screw 501.
Brake shoes 6 and 6', which move toward and away from each other as the shaft 5 rotates, are screwed into both ends provided with left-hand threads 502.

The brake shoe 6.6' has a recess 6a at its upper end.
The concave portion 6a is slidably fitted into and guided by a protrusion 16 provided on the truck 3, and the lower part of the brake shoe 6.6' is vertically disposed to sandwich both sides of the rail 1. .

At the center of this shaft 5, there is a driving part clutch 17 to which power is transmitted from the rotating shaft of the wheel, and this driving part clutch 17.
A driven part clutch 18 to which power is transmitted is provided with clutch surfaces 17a and 18a facing each other, and the driving part clutch 17 is rotatably supported by the shaft 5 via a bearing (not shown). At the same time, there is a sprocket 1 on the outer circumferential surface.
2 and connected to this sprocket 12 (
(not shown), the power of the rotating shaft is constantly transmitted.

On the other hand, the driven part clutch 18 has a key groove (
(not shown) is fitted into a key 19 provided on the shaft 5, is slidably supported on the shaft 5, and is attached to the drive unit clutch 17 side by a repulsion spring 20 provided on the rear end side. Forced.

A locking plate 21 (described later) is interposed between the driven part clutch 18 and the driving part clutch 17 so as to keep them apart at all times. It is released by the operation of a centrifugal actuator 22 coaxially arranged on the rear end surface.

As shown in FIGS. 4 and 5, the centrifugal actuator 22 is mounted on a mounting plate 23 attached to the rear end plate surface of the driving unit clutch 17.
, a pair of balance weights 25 and 25' whose rear ends are rotatably supported via pins 24, and a mounting plate 23.
This balance weight 25.25
A repulsion spring 26 elastically supports the rear end of one of the balance weights 25, and one end is connected to the tip of the balance weight 25, and the balance weight 25'
A connecting lever 27 whose other end is connected to the rear end, and a mounting plate 23
The balance weight stopper 28 is attached to the balance weight 25 and locks the tip of the balance weight 25.

In the centrifugal actuator 22, the balance weights 25, 25' are expanded by centrifugal force as the drive unit clutch 17 rotates, and actuates an operating section that releases the locking plate 21.

As shown in FIGS. 6 and 7, the central portion of the operating portion is rotatably supported by a support 29 provided on the truck via a shaft 30, and a locking plate 21 is attached to the tip portion. Pin 21a
An engaging portion 31a that engages with the spring 32 is provided, and the rear end portion is
The locking temporary presser 31 is held on the support body 29 by the
The rear end portion is integrally supported by the shaft 30 of this locking temporary presser 31, and the tip portion 33a is supported by the balance weights 25, 25.
and an operating rod 33 located on the centrifugal orbit of .

The locking plate 21 has a protruding pin 21a on the side surface and a notch 21b at the tip that engages with the shaft 5, and the rear end is connected to the support plate 29 via the shaft 34. It is rotatably supported.

This locking plate 21 is pulled in a direction away from the shaft 5 via a spring 35 held at one end on the cart side, and normally the pin 21a is engaged with the engaging portion 31a of the temporary locking holder 31. The clutch 18 is pressed toward the shaft 5, thereby suppressing movement of the driven clutch 18.

In this device, when the cart that has been pulled up so far descends due to a mechanical or electrical failure of the traction device (not shown) for the rope 2 or a malfunction of the device, the cart's descending speed will be lower than normal. When the travel speed exceeds the travel speed and reaches a predetermined speed, the balance weight 25.25 of the centrifugal actuator 22
' expands due to centrifugal force, its tip comes into contact with the tip 33a of the actuating rod 33, and rotates the actuating rod 33 as it rotates.

Next, the locking temporary presser 31 rotates with the rotation of the operating rod 33, and the engaging portion 31a of the locking temporary presser 31 is disengaged from the pin 21a of the locking plate 21.

As a result, the locking plate 21 is pulled in the direction of the arrow in the figure by the spring 35, the notch 21b is separated from the shaft 5, and the locking plate 21 is separated from between the driving part clutch 17 and the driven part clutch 18.

Thereby, the driven part clutch 18 is pushed by the spring 20 and engages with the driving part clutch 17.

Since the driving part clutch is always rotating in conjunction with the wheels, its rotation is transmitted to the shaft 5 via the driven part clutch 18, and the shaft 5 begins to rotate.

This shaft 5 has brake shoes 6 and 6' screwed together with opposite threads at both ends, so when the shaft 5 rotates in the direction in which the cart descends, the brake shoes 6 and 6' approach each other. , grip both sides of the rail 1 to stop the cart.

Therefore, when the cart's descending speed reaches a predetermined speed,
Since the centrifugal actuator 22 quickly operates to release the locking plate 21, accidents caused by lowering the cart can be prevented.

As described above, according to the safety device for the cart for transporting people and cargo according to the present invention, when the cart descends for some reason, if the cart's descending speed exceeds the normal running speed and reaches a predetermined speed, centrifugal force As a result, the balance weight of the centrifugal actuator is expanded to release the locking body that operates the brake means, so that the cart can be stopped automatically.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing a conventional cart for transporting people and luggage, Fig. 2 is a conceptual sectional view showing a safety device used in the cart shown in Fig. 1, and Fig. 3 is an embodiment of the present invention. FIGS. 4 and 5 are conceptual cross-sectional views showing safety devices for personnel and luggage transport carts, and FIGS. 4 and 5 show the centrifugal actuator of FIG. 3,
FIG. 4 is a front view, and FIG. 5 is a right side view of FIG. 4. FIGS. 6 and 7 are conceptual diagrams showing a method of releasing the locking plate. 1...Rail, 2...-o-fu, 3...
...Bogie, 4...Wheel, 5...Axle, 6, 6'...Curved brake shoe, 17...Driving part clutch, 1 Death/driven part Clutch, 21...
... Locking plate, 22 ... Centrifugal actuator, 25.25
'... Balance weight, 26... Repulsion spring, 27... Connection lever 29...
・Support body, 31...Locking temporary presser, 33...
...Operating rod, 34...Shaft, 35...Spring, 21a...Zen.

Claims (1)

[Scope of utility model registration request] A brake means provided on the cart of the cart and operated by the power transmitted from the wheels of the cart to stop the cart by clinging to the rail, and a clutch means to disconnect and disconnect power transmission between the wheels and the brake means. , a locking body for suppressing the engaged state of the clutch means, and a cart for transporting personnel and cargo, which releases the locking body and engages the clutch means when the descending speed of the cart exceeds a predetermined speed. In the safety device, a biasing means that biases the locking body in a direction to release the locking body, a locking body presser that holds the locking body in the locked position against the biasing force of the biasing means, and a centrifugal actuator provided with a balance weight that expands when the cart's descending speed exceeds the normal running speed and reaches a predetermined speed, and the locking body presser is held by the expanding operation of the balance weight of the centrifugal actuator. A safety device for a cart for transporting personnel and luggage, characterized in that the device is configured to be released.