JPH0136874Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a pantograph type hoist,
Specifically, the present invention relates to a pantograph type hoist that is equipped with measures to prevent the hoist from falling due to wire breakage or the like.

(Prior Art) A pantograph hoist is often used when lifting and transporting heavy objects. A pantograph hoist is a hoist that hoists a load by winding a wire, and is also equipped with a pantograph to prevent the hoist from rolling.

(Problems to be solved by the invention) By the way, wires, hooks for lifting loads, etc. are important items to be inspected on a daily basis to ensure work safety. However, in the event that the wire is cut or the like, conventional hoist devices do not have any measures to prevent the wire from falling, resulting in damage to the transported object or equipment on the transport path. For this reason, there has been a desire for an immediate solution to the above-mentioned problems, but the current situation is that a fully satisfactory solution has not yet been developed. Therefore, in order to solve this problem, the present invention aims to provide a hoist that can prevent damage to conveyed objects or equipment even in emergency situations such as wire cutting.

(Means for solving the problem) The present invention attempts to solve the problem as follows. That is, it is a pantograph type hoist that is equipped with a base and lifts a load by winding a wire, and includes a support member vertically hung from the bottom surface of the base, and a support member in a plane perpendicular to the support member. The arm is rotatably extended, and one end of which is always hooked to the wire under tension by a spring, and the other end of the arm is connected to the upper end of the arm via a rope or the like, and the wire is cut. a chain that moves upward along the support member by the lifting action of the arm by the spring; a sprocket rotatably supported on the support member so as to mesh with the chain; The mechanism is designed to include a locking pawl that always protrudes in an upright position from a part of the pantograph, falls down as it engages with the chain, and can restrict the extension of the pantograph by locking onto a part of the pantograph. It is.

(Function) Since the present invention is formed as described above, when the wire is cut, etc., the hoist can be prevented from falling in the following manner. That is, when the wire is cut, etc., it is first relaxed. Along with this, the arm is rotated by the tension spring and pulls up the chain via the rope.
Then, when the chain is pulled up, the sprocket rotates, and in conjunction with this, the lock pawl collapses, making it possible to catch and lock the falling pantograph. In this way, even if the wire is cut, the hoist can be prevented from falling, and damage to the conveyed object or equipment can be prevented.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

In the drawings, reference numeral 1 denotes a base provided with running wheels 2, which is suspended and supported along rails 3 so as to be self-propelled. Further, a known electric hoist equipped with a hanging hook 4, a winding drum 5 for wire w, and the like is attached to the center of the lower surface of the base 1.
A base 6 for hanging a work (iron plate) formed in the shape of a rectangular table is hooked onto the hook 4, and the work is hung on the lower surface of the base 6 by the expansion and contraction operation of an air cylinder 7. A pair of clamp claws 8 that can be clamped are attached.

On the other hand, the base 6 and the base 1 are connected by a pantograph 9, and can be expanded and contracted in the vertical direction by feeding out and winding up the wire w. The pantographs 9 are arranged facing each other on the front side and the back side in FIG.
are connected. Further, the upper and lower fixed ends of both pantographs 9 are pinned to the base 1 and the base 6 via brackets 11 and 12, respectively, while the upper and lower movable ends are connected to the base 1 and the base 6 by a guide shaft. It is slidably attached via 13 and 14.

Now, on the lower surface of the base 6 and on the side of the winding drum 5, a fall prevention device A is installed which mechanically detects the breakage of the wire w, the breakage and detachment of the hook 4, etc., and takes measures accordingly. . Hereinafter, this fall prevention device A will be described in detail. A support member 15 formed in a cylindrical shape is vertically suspended from the bottom surface of the base 1, and an arm 17 is attached to the outside of the upper part via a bracket 16. is pinned for rotation in a vertical plane. and,
Its lower end and the wire w are tied together by a suitable rope 18, which is kept under tension by a tension spring 19 stretched between the arm 17 and the bracket 16. However, the rope 18 is tied to the binding side of the two rows of wires w (those on the binding side and those on the winding side).

On the other hand, a rope 20 is tied to the upper end side of the arm 17, and this rope 20 is connected to the support member 1.
5 and is connected to one end of a chain 22 via a pulley 21. chain 2
2 is movable up and down while being guided by a guide member 23 vertically fixed to the inner surface of the support member 15, and a tension spring 24 is stretched between the lower end of the guide member 23 and the lower end of the support member 15. is biased downward by. Two sprockets 25a and 25b are vertically rotatably supported within the support member 15, and are meshed with the chain 22, respectively. And both sprockets 25a, 25
Lock pawls 26a and 26b are protruded from sprockets 25a and 26b, and although they are normally stored in the supporting member 15 in an upright position,
When 5b is rotated in the direction indicated by the arrow in the figure, it collapses accordingly and protrudes from the support member 15, thereby locking onto the pin shaft 10 of the pantograph 9 or the base 6 to prevent the pantograph 9 from falling. I can do it.

Subsequently, the functions and effects of this example formed as described above will be specifically explained.

First, to briefly explain the normal hoist operation, the workpiece is clamped and unclamped by opening and closing both clamp claws 8 by operating the air cylinder 7. Further, the workpiece is raised and lowered by unwinding the wire w by the winding drum 5 and by expanding and contracting the pantograph 9 due to winding.
By running the base 1 along the rails 3, the workpiece can be transferred to a predetermined position.

Next, the operation when the wire w is cut or the like will be explained. When the wire w is cut or separated from the base 6 due to breakage of the hook 4, etc., the wire w becomes relaxed. Along with this, the arm 17, which was tied under tension to the wire w, is pulled by the tension spring 19 and rotates clockwise in the figure, so that the tension spring 24
The chain 22 is pulled up via the rope 20 while resisting. At this time, the chain 22 moves upward while being guided by the guide member 23, and both sprockets 25a, which engage the chain 22,
25b respectively rotate counterclockwise in the drawing. Along with this, the lock claws 26a and 26b are attached to the support member 1.
5, the lock claws 26a and 26b on any side receive the pin shaft 10 or the base 6 that connects both pantographs 9, thereby regulating the extension of the pantograph 9 (see Fig. 1). and Figure 3). In this way, it is possible to prevent the hoist from falling due to the extension of the pantograph 9, thereby preventing damage to the conveyed object or equipment.

(Effects of the invention) As detailed above, the present invention detects the loosening of the wire in a pantograph type hoist when a wire breakage occurs, and accordingly pulls up the chain and rotates the sprocket. The extension of the pantograph is controlled by protruding locking claws. Therefore, even if the wire should break during transportation, the hoist will be prevented from falling suddenly, which will prevent damage to the transported object or equipment, which is extremely beneficial for this type of hoist. This is a great idea.

[Brief explanation of the drawing]

FIG. 1 is a front view of the hoist of this example, FIG. 2 is a sectional view showing the safety device, and FIG. 3 is a front view showing the state in which the locking pawl has received the base. DESCRIPTION OF SYMBOLS 1... Base, 9... Pantograph, 15... Support member, 17... Arm, 19... Tension spring, 22... Chain, 25a, 25b...
...Sprocket, 26a, 26b...Lock claw,
w...wire.

Claims (1)

[Scope of utility model registration request] A pantograph type hoist that is equipped with a base and lifts a load by winding a wire,
A support member vertically hung on the lower surface of the base, and a support member extending so as to be rotatable in a vertical plane with respect to the support member, and one end of which is always hooked to the wire in a tensioned state by a spring. The other end of the arm is connected to the upper end of the arm via a rope or the like, and when the wire is loosened due to cutting or the like, the arm is pulled up by the spring and moves upward along the support member. A chain, a sprocket rotatably supported by a support member so as to be able to mesh with the chain, and a part of the sprocket that normally protrudes in an upright state and is brought down as it engages with the chain, allowing the pantograph to A pantograph type hoist characterized by being equipped with a locking claw that can restrict the extension of the pantograph by locking the pantograph.