JP2000200514A - Motor-driven elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock an elevating unit to a main body by surely rotating a lock piece for locking, to release the lock by a release piece and to prevent the elevating unit from being tilted by a side lock. SOLUTION: In this motor-driven elevator, a rotating shaft 13 is provided on a shaft mounting plate 17 fixed to a main body 2 on the side of the main body 2. There are provided lock pieces 15 and 16 that rotates left and right as the rotating shaft 13 is a support point, and hook parts 15a and 16a for holding a lock shaft 18 on the end parts of the lock pieces 15 and 16. On the upper surface of the center part of an elevating unit 9, the lock shaft mounting plate 17 fixed to the elevating unit 9, the lock shaft 18 held by the lock shaft mounting plate 17, a release piece 22 for releasing the lock pieces 15 and 16 just under the lock shaft 18 and a guide bar that enables the release piece 22 to be slidable are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an electric lifting device. In particular, it relates to a lock mechanism of the lifting unit.

2. Description of the Related Art In a conventional electric lifting device, a lifting unit is mechanically held by two pairs of lock devices. The locking device holds the locking claw horizontally by a torsion spring.

In the above prior art, the side surface of the elevating unit is mechanically held by two pairs of locking claws provided on the main body side. The locking claw is held horizontally on the locking shaft by a torsion spring. During use, if dirt or dust enters the device and adheres to the lock claw and the lock shaft, the friction increases, and if the lock claw hinders the smooth rotation of the lock shaft, the lock stops. Moreover, when only one of the two pairs is locked, the elevating unit tilts and cannot be lowered. further,
The contacts of the lamp lighting circuits provided on the main body side and the elevating unit side cannot be normally connected, and the lamp cannot be turned on. SUMMARY OF THE INVENTION It is an object of the present invention to reliably rotate a locking piece for locking to lock an elevating unit to a main body and to release locking by a release piece. Another object of the present invention is to prevent the lifting unit from tilting due to the one-side lock.

To achieve the above object, the following lock mechanism is provided. On the main body side, a rotating shaft is provided on a shaft mounting plate fixed to the main body, a locking piece that rotates left and right with the rotating shaft as a fulcrum, and a hook that holds the locking shaft at the end of the locking piece. Have. On the upper surface of the central part of the lifting unit, a locking shaft mounting plate fixed to the lifting unit, a locking shaft held by the plate, a releasing piece for releasing the locking piece immediately below the locking shaft, and a releasing piece are provided. It consists of a slidable guide rod. When the lifting unit is lifted, the locking piece rotates and the locking shaft provided in the lifting unit hits the guide plate and the lower slope of the locking piece to rotate, and the locking shaft is held by the hook that holds the locking shaft. Is done. The rotation axis of the locking piece is at the top, and the center of gravity of the locking piece is below the rotation axis, so when no external force is applied, the locking piece always lowers by its own weight, so it rotates Even when the torsion spring provided on the shaft part has deteriorated, it can be reliably locked. Also, for the release piece,
Due to its own weight, it is in contact with the upper surface of the lifting unit, and there is usually a gap between the locking shaft and the release piece, so that erroneous locking and unlocking does not occur. As described above, since the position of the center of gravity of the locking piece provided on the main body side is below the rotation axis, the locking piece always hangs down due to its own weight. Furthermore, the rotation axis of the locking piece is located at the upper end and is elongated downward, so that it is separated from the rotation axis and the position of the center of gravity, so that it is easy to face downward. When ascending, the locking piece provided on the upper surface of the central part of the lifting unit hits the guide plate provided on the main body and the lower slope of the locking piece rotating about the shaft provided on the guide plate as a fulcrum, so that the locking piece is When it is pushed outward and rotated to open, and the locking shaft is above the hook at the lower end of the locking piece, its own weight and the force of the torsion spring provided on the rotating shaft as an auxiliary assist the weight to the original position inside. Return to When the lifting device is lowered from the set state,
The lifting unit first rises. When the protrusion provided on the side surface of the release piece provided on the lifting / lowering unit is located above the hook of the locking piece, the motor is reversely rotated and lowered,
The release piece is caught by the protrusion provided at the lower end of the locking piece, descends while being sandwiched, and moves to almost immediately below the locking axis. At the same time, the locking piece comes off from the projection of the release piece, so that the locking shaft can be lowered, and the elevating unit is lowered. The release piece returns to its original position in contact with the upper surface of the elevating unit by its own weight. At the time of locking, the locking piece is rotated and opened by the locking shaft, and after passing through the locking shaft, returns to the inside by its own weight and the force of the auxiliary torsion spring. Also, at the time of unlocking, the locking piece is rotated and opened by the releasing piece, the elevating unit descends, and after the releasing piece and the locking shaft pass, the weight returns to its original position by its own weight. No malfunction due to surface contamination.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 2 and 3, a reversible motor 4 attached via a motor attachment base attached to the main body 2 and a drum 5 provided on a rotating shaft 13 thereof,
The wire rope 6 for raising and lowering the lifting unit 9 is wound up. The wire rope 6 is disposed inside the lifting unit 9 via a pulley 7, and the end is fixed to a mounting bracket fixed to the main body 2. Further, the main body 2 has a contact mounting plate 19 for mounting the fixed contact 21 and has a structure that can be moved up and down by a compression spring 23 that elastically holds the contact mounting plate 19.
The contact mounting plate 19 is guided by a mounting plate 27 that holds the lifting section guides 8 provided on both sides of the contact mounting plate 19. When ascending, the elevating unit 9 is guided by the elevating unit guide 8 and ascends. The guide plate of the locking shaft fixed to the main body 2 by screwing or the like has a “U-shape” shape, and the rotation shaft 13 provided at the upper end of the guide plate and the rotation shaft with the rotation shaft as a fulcrum. The moving locking piece 15 is rotatably held. The locking piece 15 is located inside a U-shaped guide plate. When no external force is applied, the locking piece 15 is always lowered by its own weight as shown in FIG. 1A. In addition, a torsion spring 14 is provided around the rotation shaft 13 to make the operation when an external force is applied smoother, so that the rotation is performed in an auxiliary manner. The elevating unit 9 has a pair or two provided with a compression coil spring.
There are three pairs of movable contacts 21, and a sliding part guide 24 is provided on the center upper surface via a locking shaft 18 provided on a locking shaft mounting plate 17, a release piece 22 and a compression coil spring 23. ing. FIG. 1 is a diagram illustrating the operation of the lock mechanism.
FIG. 1a shows the locked state, in which the locking shaft 18 is
The guide plate is held by hooks 15a, 16a of the locking pieces 15, 16. When the select switch of the elevating device is set to the down position, it is first lifted because it is released by the locking shaft 18. FIG.
b shows the position at the upper fulcrum, the locking piece 15 is pushed out by the release piece 22 and the protrusion 22a of the release piece 22 is shown.
Passes through the hooks 15a and 16a of the locking piece and is located at the upper part. At this time, the micro switch is operated to rotate the motor 4 in the reverse direction and lower it. FIG. 1C shows a state in which the lowering starts, and the hooks 15a, 1
6a is engaged with the projection 22a of the release piece 22, and the locking shaft 1
The release piece 22 is held even when the position 8 is lowered. Lowering amount l
When it is lowered only, the upper surface of the releasing piece 22 hits the locking shaft 18, the locking pieces 15 and 16 are pushed outward, and the locking shaft 18 is released simultaneously with the releasing piece 22, and the lifting unit 9 is moved. Perform a descent. FIG. 1D shows a state in which the elevating unit 9 descends and the locking shaft 18 is not provided. FIG.
"e" indicates a position immediately before being set in the elevating unit when the select switch of the elevating device is set to the up position. FIG. 1f
The locking pieces 15 and 16 are pushed open by the locking shaft 18, and the locking shaft 18 is
At this point, the micro switch is actuated, and the motor 4 is rotated backward and lowered to return to the state shown in FIG. 1A and become a locked state.

Since the present invention is configured as described above, it has the following effects. 1. At the time of locking, the locking piece is pushed and spread by the locking shaft provided on the elevating unit, and is lowered by its own weight, so that locking can be reliably performed. 2. At the time of unlocking The locking piece is pushed and spread by the releasing piece, starts descending while holding the projection of the releasing piece, and is released from the locking piece together with the locking shaft, so that the lock can be reliably released.

[Brief description of the drawings]

FIG. 1 is an operation explanatory view (longitudinal sectional view) showing a lock mechanism section of the device of the present invention, in which a is a locked state (elevation unit is set), b is an upper fulcrum state, and c is a descent from the state of b. The start state, d is a state where the lock is released and lowered, e is a state where the lock is raised from the state of a, and f is a state where the locking shaft is above the hook portion of the locking piece.

FIG. 2 is a plan view of the device of the present invention.

FIG. 3 is a cross-sectional view thereof.

FIG. 4 is a longitudinal sectional view thereof.

[Explanation of symbols]

1: cover, 2: body, 3: arm, 4: motor, 5:
Drum, 6: wire rope, 7: pulley, 8: elevating unit guide, 9: elevating unit, 10: control circuit, 1
1: terminal block, 13: rotating shaft, 14: torsion spring, 1
5: locking piece, 16: locking piece, 17: locking shaft mounting plate, 1
8: locking shaft, 19: contact mounting plate, 20: fixed contact, 2
1: movable contact, 22: release piece, 23: compression spring, 24:
Slider guide, 25: compression spring, 26: wire mounting bracket, 27: mounting plate

Claims (1)

[Claims] 1. A reversible motor mounted on a bracket, a drum provided on a main shaft thereof for winding a wire rope, a wire rope for raising and lowering an elevating unit, and a plurality of pulleys for changing a direction in which the wire rope is disposed. An elevating unit to which lighting equipment is attached, an elevating unit guide case that guides and stores the elevating unit in the main body, a locking piece that fixes the elevating unit to the main body, and a contact point for applying current to the lighting equipment and a contact with a constant contact pressure An electric lifting device including a coil spring and a contact mounting base, wherein a pair of locking pieces rotatable around a rotating shaft on the main body, and a locking shaft provided on the lifting unit are slidable upward. An electric hoisting and lowering device provided with an unlocking piece.