JPH0231057A - Emergency stop device for winding shaft - Google Patents

Abstract

PURPOSE:To prevent free drop of a shutter securely at the time of accedental breakage of a chain by composing the titled device of a locking lever energized to protrude, a freely rotatable trigger, a solenoid coil, and a switch protruding in the protrusion direction. CONSTITUTION:If an endless chain 16 for moving a shutter up and down is cut, the endless chain 16 suspended from a gear 14 contacts a contacting member 12 at the forward end of a pressure receiving part 11 of a switch 10. With this action, the switch 10 gets on, and a solenoid coil 8 is energized and excited to suck a plunger 9, when a trigger 7 rotates counterclockwise about a pivotal point of a face plate 1, so a flange part 5 applied to a forward end part 7a of the trigger 7 is released. A locking lever 4 released by this to be free protrudes to the external from the face plate 1 suddenly by action of a spring 6, so the forward end of the locking lever 4 protrudes into a receiving hole 15 of the gear 14, thereby rotation of the gear 14 and a winding shaft 13 is prevented.

Description

[Detailed Description of the Invention] Industrial Application Field of the Present Invention The present invention provides a winding shaft that is rotated via a chain.
This invention relates to an emergency stop device for a winding shaft that momentarily stops the winding shaft in a free state when the chain that transmits power is cut.

<Prior art> (Figure 5) Heavy shutters, lightweight shutters a, etc. for closing openings in buildings are held in a wound state on a winding shaft,
The gear C fixed to the winding shaft and the gear f fixed to the rotating shaft e of the power source d are connected by an endless chain g, and by operating the power source d, the winding shaft is rotated. The shutter a, etc. that is being turned is extended or wound.

Safety measures for such equipment are to ensure regular inspection of the power source d, chain g, and winding shaft used, and to replace the chain g as soon as possible if deterioration is found, thereby preventing accidents. Preventing occurrence.

Furthermore, a system is also adopted in which the electric motor of the power source d is brought to an emergency stop if the chain g is severed due to an accident.

In addition to the shutter mentioned above, the safety measures are almost the same for winches that use wire lobes and pulleys.

Problems to be Solved by the Present Invention> (Figure 6) In such a device, if the chain g or wire rope used to transmit power to the winding shaft is cut as described above, the power source A means for causing the motor d to make an emergency stop is provided.

However, there is no means for fixing the winding shaft itself so that it does not rotate.

Therefore, even if the electric motor is stopped in an emergency, if the shutter g, etc. wound around the winding shaft is partially hanging downward, the cut chain g will fall into the gear C of the winding shaft. If it comes off, the winding shaft will close to the shutter g.
The shutter g, etc. rotates due to its own weight, and falls at an accelerated rate, colliding with the floor.

At present, only one person has been reported to have died from a falling shutter accident in the Kyushu region, but especially in the case of heavy shutters, they are frequently used in service industries such as department stores and financial institutions. There are many concerns about accidents occurring.

Means for Solving the Problems> Accidents of shutters falling due to their own weight occur due to breakage or detachment of chains, etc. that connect the power source and the winding shaft.

Starting from this fact, the invention provides that if the chain deviates from the proper circulation path, contact with the chain activates a switch fixed to the frame.

When the switch is activated, a solenoid coil fixed to the frame is energized, the inserted plunger is attracted, and a trigger pivotally attached to the tip of the plunger is actuated.

As mentioned above, the rear end of the trigger is pivotally connected to the tip of the plunger, and the middle part of the trigger is rotatably attached to the frame, and the tip moves the lock lever under the action of a spring to the retracted position. It is locked in place.

The lock rod is installed so as to be able to protrude through the face plate of the frame, and is forced to retreat into the frame against the force of the spring, and is caused to protrude from the frame to the outside by the action of the spring. The trigger locks to maintain the lock within the frame in its retracted position.

In order to receive the action of the lock lever appropriately, a plurality of holes or seats are bored or installed in the gear fixed to the winding shaft of the shutter or the like.

The device of the present invention thus constructed is fixed to a box or frame in which a winding shaft of a shutter or the like is housed, and the tip of the locking rod is installed so that the receiver bored into the gear is on the passing line of the hole. .

As described above, the device of the present invention is installed in a hoisting device in which a gear fixed to the rotating shaft of the electric motor and a gear having a receiving hole fixed to the winding shaft of the shutter are connected by an endless chain.

When the endless chain is cut by this, the electric motor is stopped in an emergency, and one lock lever protrudes from the frame body due to the action of the spring, and the receiver drilled in the gear of the winding shaft plunges into the hole.
The winding shaft is completely fixed at that position, completely preventing the shutter wound around the S shaft from falling due to its own weight.

The above are the problem solving means adopted by the present invention.

According to the present invention, the lock rod, which penetrates the face plate of the frame body and is given a tendency to protrude under the action of a spring, has a tip that locks the lock rod in a retracted position, and an intermediate portion that rotates around the frame body. A movably pivoted trigger piece holds a solenoid, which is fixed to the frame and whose plunger end is pivoted to the rear end of the lock lever. It is activated by a switch that penetrates the face plate and protrudes in the direction in which the lock rod protrudes, and when the cut chain hits the limit switch, the lock rod protrudes from the frame and the gear receiver fixed to the winding shaft is opened. completely prevents the rotation of the winding shaft and completely prevents the shutter wound around the winding shaft from falling due to its own weight.

Embodiments of the Present Invention (FIGS. 1 to 3) Specific embodiments of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, 1 is the face plate, and since the device is integrated, the side is omitted.
key. A frame body 3 is formed with a flat back plate 2 fixed thereto.

In the illustrated example, reference numeral 4 denotes a lock rod that passes through the face plate 1 and the back plate 2 and projects outward at both ends, and a spring is stretched between the collar 5 and the back plate 2 fixed in the middle part. 6 gives a tendency to protrude from the face plate 1.

Reference numeral 7 denotes a trigger whose middle part is rotatably attached to the face plate 1, whose tip 7a is in contact with the lock rod 4 between the collar 5 and the face plate 1, and whose rear end 7b is attached to the frame 3 side. protrudes towards the side. (
(See FIG. 2) 8 is a solenoid coil fixed to the side surface of the frame 3, and the tip of a plunger 9 inserted therein is pivoted to the rear end 7b of the trigger 7.

10 is a switch fixed inside the frame 3; switch 1;
A pressure receiving arm 11 for actuating the lock passes through the face plate 1 and projects in the direction in which the lock rod 4 projects. In the illustrated example, a contact piece 12 is fixed to the tip of the pressure-receiving arm 11 parallel to the face plate l in order to ensure the operation of the switch 10.

In FIG. 1, 13 is a winding shaft around which a shutter etc. (not shown) is wound, and 14 is a gear fixed to the winding shaft 13. Reference numeral 15 is a hole bored in the gear 14 as shown in FIG.

The wiring in this embodiment is completed by connecting one of two external power lines to the solenoid coil 8, the other to the switch 10, and further connecting the switch 10 and the solenoid coil 8.

In the state shown in FIG. 1, the lock rod 4 is pushed into the frame 3 against the action of the spring 6, and the flange 5 of the lock rod 4 is the plunger of the solenoid coil 8 in an inoperative state. By coming into contact with the tip 7a of the trigger 7 pivotally attached to the trigger 9, the trigger 7 is prevented from protruding outside the face plate 1.

Operation of the above embodiment> The operation of the embodiment will be explained.

Normally, the shutter is raised and lowered by connecting a gear fixed to the rotating shaft of a separately prepared electric motor (not shown) and the illustrated gear 14 with an endless chain 16, and driving the winding shaft 13 in the required direction by the electric motor. Let's do it. In this case, the device of the invention does not work at all.

Next, if the endless chain 16 is cut for some reason, the endless chain 16 hanging down from the gear 14 comes into contact with the contact piece 12 fixed to the tip of the pressure receiving part 11 of the switch 10. As a result of this operation, the switch 10 is turned on and the solenoid coil 8 is energized and the plunger 9 is turned on.
2, the trigger 7 rotates counterclockwise around the pivot point with the face plate 1, and the flange 5 that was in contact with the tip 7a of the trigger 7 is released. Ru.

As a result, the free lock rod 4 suddenly protrudes outward from the face plate 1 due to the action of the spring 6, and the tip 4a of the lock rod 4 enters the hole 15 of the gear 14, causing the gear 14
and prevents rotation of the winding shaft 13.

In this way, the rotation of the winding shaft 13 can be blocked at the same time as the chain 16 is cut, so the necessary repairs can be carried out in this blocked state, and after the repairs are completed, the trigger 7 can be manually rotated in the opposite direction to when it is activated. Afterwards, the lock 4 is pushed into the frame 3 against the action of the spring 6, and the flange 5 of the lock 4 and the tip 7a of the trigger 7 are brought into contact again to lock the lock 4 in the retracted position. If you stop, the situation will return to its previous state.

FIG. 3 shows a gear 14 with four holes 15 drilled in the receiver, but if the strength of the gear 14 is not impaired,
The number of holes 15 and the shape of the holes 15 in the receiver are arbitrary.

In the description of this embodiment, an example was explained in which the gear 14 is provided with a hole 15, but means for engaging with the protruding tip of the locking rod 4 to prevent the gear 14 from rotating. If,
Any format can be adopted.

Effects of the present invention> According to the present invention, by attaching the present invention device to a hoisting device such as a shutter, in the event of a chain breakage accident,
This has the effect of reliably preventing the shutter from falling freely.

[Brief explanation of the drawing]

FIG. 1 is a side view of a shutter winding shaft equipped with the present invention device, FIG. 2 is a front view of the present invention device, and FIG. 3 is a front view of a shutter winding shaft gear suitable for applying the present invention device. Fourth
The figure is an exploded perspective view of the lock lever and trigger employed in the device of the present invention, and FIGS. 5 and 6 are conceptual diagrams of a conventional shutter hoisting device. 1.Face plate, 2.Fist back plate, 3.Frame, 4.Lock rod,
5φ・Brim part, 6・Spring, 7・Fist trigger, 8aI
I solenoid coil, 9#-plunger, 10 switches, 1111Φ pressure receiving arm, 12... contact piece, 13...
Winding shaft, 14--Gear, 15--Hole for receiver, 16--Endless chain.

Claims (1)

[Scope of Claims] A lock rod that passes through a face plate of a frame body and has a tendency to protrude under the action of a spring; A trigger piece is pivotally mounted for free movement, a solenoid coil is fixed to the frame and its plunger end is pivoted to the rear end of the lock lever, and a solenoid coil is fixed to the frame and its pressure receiving arm is attached to the face plate of the frame. A winding shaft emergency stop device consisting of a switch that penetrates through the lock rod and protrudes in the direction in which the lock lever protrudes.