JPS5925824Y2 - Safety devices used in lifting and lowering transportation equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a unit-type safety device that can be attached to equipment for lifting and lowering articles and other items on a carrier to exhibit great effects.

In general, equipment and devices that have lifting and lowering functions, such as elevators, lifts, and suspended work scaffolds, are equipped with safety devices to prevent falls in preparation for unexpected accidents. There is.

However, many of them have complicated structures, so they are prone to failure and are often unstable in operation.

Furthermore, in many cases, braking force is applied to the rails, etc. that guide the carrier, so once the safety device is activated and the purpose has been achieved, it may not be possible to use it again unless the related parts are repaired. Also, since it is built into the carrier, it is inconvenient to manufacture.

The present invention aims to solve these problems and provide a unit-type safety device that has an extremely simple structure, can be easily attached to a carrier, and operates quickly and reliably in an emergency.

Another purpose of this invention is to stretch a safety cable along the guide rail of the carrier, to detect the speed by contacting the sheave with the safety cable, and to connect it with the centrifugal part when the set speed is exceeded. To provide a safety device which operates a locking cam and clamps a safety cable between the locking cam and a receiving piece provided opposite to the locking cam to reliably prevent a carrier from falling.

In order to achieve these purposes, a separate safety cable is strung parallel to the carrier guide rail, etc., and this safety cable is kept in a straight line inside a casing attached to the carrier or the lifting guide support tower. A sheave that rotates in contact with the sheave detects the speed, and when the detected speed exceeds the feed limit, a piece attached to the sheave operates a link to operate the connected locking cam. The safety rope is held between the fixed catch piece and the locking cam to prevent movement of the carrier, and this device detects the speed within the device in the middle of the stretched rope. The structure allows for easy insertion into the handle and the handle.

One embodiment of the safety device of the present invention will be specifically explained as follows.

In Figures 1 and 2, 1 is equipped with a mounting seat 2 for the frame of a carrier, etc., and has rope introduction outlets 3 and 3' on both upper and lower sides, and is hinged to the front so that it can be opened and closed. lid 4
It is a picture-shaped casing.

Reference numeral 5 denotes a rope sheep that is freely supported on a shaft 7 whose both ends are fastened to the bottom plate 1' of the casing 1 and a support plate 6 whose both ends are removably attached to the upper and lower sides of the casing.

8 has its rear end pivoted to the front surface of the sheave 5 by a pin 9, and its front end locks the other end of a tension spring 10 whose one end is fixed to the sheave to form an arc shape that is normally located near the axis. A locking claw 8' is provided at the tip of the distal portion.

Reference numeral 11 denotes a bell crank type operation piece whose center is pivotally supported on the sheave support shaft 7, and its tip is bent inward to engage with the locking pawl 8 of the distal portion piece 8 in an emergency. There is.

Reference numeral 12 designates a locking cam whose central portion is loosely supported on a shaft 13 supported by the casing bottom plate 1' and the support plate 6 at a position above the sheave 5, and its rear end and the rear end of the operating piece 11 are connected to a connecting rod 14. Connect with pins.

The distal end 12' of the locking cam 12 has a convex curved surface with the lower end slightly protruding from the upper end.

Reference numeral 15 denotes a rope receiving piece located on the side of the support shaft 13 of the locking cam, which is curved inward at an appropriate radius with its center point located on the extension line of the plate thickness center of the locking cam 12. ,
As shown in the figure, a gap is formed between the support plate 6 and the rope into which the rope can be introduced, and the rope entrance/exit 3 is located directly above the gap.

16 is a rope pusher roller whose base end is attached to the casing bottom plate 1'
A pin 18 is supported at the middle part of an operating rod 17, which is pivotally supported by a coil spring 20 between a protrusion 17' attached to the lower part of the operating rod 17 and a protrusion 19 attached to the inner wall of the casing. By engaging and interposing, the pushing roller 16 always enters the groove 5' of the sheave 5 and strongly presses the rope R against the bottom surface of the sheave groove.

The lower end of the operating rod 17 projects below the casing 1, and by grasping and pulling the handle 17'', the pusher roller 16 can be pulled outward.

Next, to explain the operation of the above device, for example, when this safety device is used in a type of lift in which a carrier is raised and lowered along a guide rail with a hanging rope, a safety rope R is attached along the guide rail in addition to the hanging rope. The device of the present invention is installed vertically, and is fixed to a suitable position of the carrier via the mounting seat 2, and the safety cable is passed from the entrance 3 in the upper part of the casing 1 through the curved part of the receiving piece 15 as shown in FIG. Push roller 16 is tangential to 5'.
After being pressed into contact with each other, the safety rope is allowed to hang downward from the entrance 3' at the bottom of the casing and passed through the inside of the casing in a straight line, and the lower end of the safety cable is tied in place and kept under tension.

When the carrier is normally moving up and down, the safety rope R is tensioned and stationary, and the sheath 15 that comes into contact with it rotates in accordance with the speed at which the carrier moves up and down.

The centrifugal force generated on the centrifugal piece 8 attached to the sheave 5 is balanced with the tension of the tension spring 10 within a preset degree of rotation, so that the sheave 5 is not placed on the safety rope R. It keeps rolling and does not come into contact with the operation piece 11.

However, if an abnormality occurs in the suspension rope and it breaks when the carrier is being lifted or lowered, or if the carrier rapidly descends, the rotation of the sheave 5 increases and exceeds the limit, and the attachment of the sheave 5 The centrifugal piece 8 overcomes the force of the tension spring 10 and is swung outward, and its tip locking pawl 8' rotates the sheave together while being restricted from swiveling by the inner wall 5'' of the recess on the side of the sheave. direction), it will eventually come into contact with the bent end 11' of the operating piece 11 and will push up the operating bent end 11' as it is.

Then, as shown in Fig. 3, the connecting rod 14 is
The locking cam 12 rotates counterclockwise around the shaft 13 via the locking cam 12, and its tip 12' enters into the receiving piece 15.
The safety rope R passing through this part is clamped by the locking cam tip 12' and the inner wall of the catch piece 15, and since the cam tip can bite into the rope, the rope R is held by the weight of the carrier. Further tightening causes the carriage to stop its lowering.

This operation is performed at the same time as the so-called overspeed detection is performed by the centrifugal piece 8, and since the safety rope is held in a tensioned state, it works perfectly without any difficulty, and especially avoids giving sudden shocks. The lowering of the carrier is prevented,
Therefore, it does not cause any damage to other parts.

To release it from the locked state, hold the handle 17'' of the operating rod 17 and pull the pusher roller 16 outward, release the pressure on the sheave groove 5' of the cable R, open the lid 4, and remove the sheave. in the opposite direction, and rotate the operating piece 11, locking cam 12, and connecting rod 1.
If 4 is pushed up, the clamping pressure on the cable by the locking cam is removed and the cable can return to its original state.

Also, when inserting a rope into this device by attaching it to a carrier, etc., pull the operating rod 17 with the lid open, pull the pushing roller 16 outward to create a gap between the sheave and the receiving piece 15. The rope R tensioned through the gap between the support plate 6 and
By inserting the safety device into the gripping portion and the speed detection portion, this safety device can be combined even in the middle of the rope, and it is possible to easily engage and disconnect from the rope without any difficulty considering the above structure.

The safety device of the present invention, as shown in the above example, detects the speed and clamps a safety rope provided separately from the suspension rope of the carrier to prevent the carrier from falling, so it does not cause sudden shock. It operates reliably without any friction, and can be assembled into a compact unit type and installed at the required location, so it can be used for all types of lifting equipment, such as rope drive type, rack and pinion drive type, or rope hanging type without a guide. In addition, instead of being attached to the carrier, it can be fixed to the lift guide support tower of the carrier and the safety cable can be moved together with the carrier, and the structure is simple, so it can be provided at low cost. It has many characteristics.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view showing the inside of a safety device made in accordance with the gist of the present invention, and Figure 2 is II-- of Figure 1.
FIG. 3 is a longitudinal cross-sectional view taken along line II, and is a diagram of the operating state. 1...Casing, 5...Sheave, 6
...Support plate, 7, 13...Axle, 8...
...Distal piece, 8'...Latching claw, 11...
...Operation piece, 12...Locking cam, 15...
...Receiver piece, 16...Press roller, R...
...Safety rope.

Claims (1)

[Scope of utility model registration request] Necessary operating elements are housed in a casing formed to be attached to a carrier in an elevating transporter or its elevating guide support tower, and the inside of the casing is stretched along the elevating guide part of the elevating transporter. The safety rope is made to pass in a straight line, and the rope sheep is rotatably supported by attaching a distal piece inside the side wall that swings out within a limited range when the set speed is exceeded within the casing. The rope groove contacts the safety rope, and from the opposite side presses the iron rope with a presser roller equipped with a lever equipped with a function to release the pressing force, so that the central part is free on the support shaft of the sheave. An operation piece is provided at the tip of the sheave and has a bent part that engages with a locking pawl at the tip of the distal section attached to the sheave in case of an emergency, and the sheave and related operations and parts are A receiving piece with one side open surrounding the safety cable is placed at a position spaced apart from the detecting means by an appropriate distance, and a locking cam having an eccentric curved surface at its tip facing the receiving piece is rotatably provided. Establish 1. The rear end of the locking cam and the rear end of the operating piece are connected by a link so that when the operating piece rotates, the safety cable is gripped by the tip of the locking cam and the inner surface of the receiving piece. A safety device for use in lifting and lowering transportation equipment, characterized in that a space is formed in the receiving piece to receive a cable from a side surface.