JP4799728B2 - Hoist - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hoist frequently used in factories or warehouses for cargo handling operations, and more particularly to a hoist configured to prevent swinging of a lifting hook when a load is suspended on a lifting hook, that is, suspended.
[0002]
[Prior art]
A hoist is frequently used in transporting heavy materials in factories and warehouses. There are various hoist configurations, and an example of a conventional hoist will be described below with reference to FIG.
[0003]
The illustrated hoist 31 includes a drive unit 32 including a motor (not shown) whose rotation drive, rotation stop, and rotation direction are controlled, and a winding drum that is rotated by the motor, and paired guide rollers 33a and 33b. A guide portion 34 provided, a wire 36 having one end wound around a take-up drum and the other end fixed to a fixed hook 35, and a lifting / lowering hook 37 provided with a pulley 37a that moves up and down by winding and unwinding the wire 36. And. In addition, an arc-shaped bracket 38 is provided on a part of the outer surface of the drive unit 32, and a hanging support hook 39 is rotatably attached to a substantially center P1 of the bracket 38 by a bolt or the like. A fixing hook 35 is rotatably attached to the end portion P2 by a bolt or the like.
[0004]
When the hoist 31 is used, a suspension support hook 39 is hung on a shaft 41 of a traveling member provided so as to be able to traverse on the ceiling of a factory or warehouse, and the entire hoist 31 is suspended. In this state, with the weight of the drive unit 32, the entire hoist 31 is inclined as indicated by the solid line with the attachment position P1 of the suspension support hook 39 as the center.
[0005]
When the load 42 is hung on the hook portion 37b of the lifting / lowering hook 37 as indicated by an imaginary line, the entire hoist 31 is indicated by an imaginary line around the attachment position P1 of the hanging support hook 39 due to its weight. The position of the lifting / lowering hook 37 is shifted from the position indicated by the solid line to the position indicated by the imaginary line.
[0006]
[Problems to be solved by the invention]
When hanging the load 42 on the lifting hook 37, the wire 11 is loosened, the wire hung around the load 42 is hung on the hook portion 37a, and the wire 11 is wound up and lifted as indicated by an imaginary line. Although the position of the lifting / lowering hook 37 is shifted as described above during the lifting, the lifting / lowering hook 37 and the luggage 42 swing like a pendulum and then settle to a position indicated by an imaginary line.
[0007]
Therefore, when the worker is in the vicinity of the load, the swinging load 42 may hit the worker.
[0008]
In addition, a gap is generated between the swinging bracket 38 and the drive unit 32, and an operator may pinch his / her hand in the gap.
[0009]
The present invention has been made in view of the above problems, and an object of the present invention is to improve safety when performing cargo handling work by preventing swinging of the load when the load is suspended on the hoist. To provide a hoist.
[0010]
[Means for Solving the Problems]
The object according to the present invention is taken up by a motor having a motor controlled in rotation driving, rotation stopping and rotating direction, a driving unit incorporating a winding drum rotated by the motor, and a rotation driving of the winding drum. And a hoist including a wire to be fed, a lifting hook that moves up and down according to winding and feeding of the wire, and a hanging support hook that is rotatably attached to one end of the outer surface of the drive unit.
When a torsion spring having one end abutting on the outer surface of the drive unit and the other end abutting on the side surface of the suspension support hook is provided, and the entire hoist is suspended via the suspension support hook The hoist is characterized in that the entire hoist is held horizontally by the elasticity of the torsion spring with the suspension support hook as a fulcrum.
[0011]
According to the above configuration , the torsion spring is provided between the hoist body such as the drive unit and the suspension support hook that is rotatably attached to the hoist, and one end of the torsion spring is driven. The other end is in contact with the side surface of the hanging support hook. Therefore, when the entire hoist is suspended using the suspension support hook, the torsion spring biases the side surface of the drive unit, in other words, the hoist body by its own elasticity with the side surface of the suspension support hook as a fulcrum. By this energization, the hoist body is held in a horizontal state.
[0012]
When carrying out cargo handling work, the wire is unwound and the lifting hook is lowered, and the wire is hoisted after the load is suspended.However, since the hoist body maintains the horizontal state, the wire unwinding position and fixing position are It does not fluctuate, and the lifting / lowering hook rises without being displaced on the same locus as when it is lowered, so that the lifting / lowering hook and the load can be prevented from swinging.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a hoist according to the present invention will be described with reference to FIGS. FIG. 1 is a side view showing the configuration of a hoist in the present embodiment, FIG. 2 is a partially enlarged cutaway view showing the configuration and operation of the main part of the hoist, and FIG. 3 is a partially enlarged side view of the main part.
[0014]
The hoist 1 in this embodiment includes a motor 2 (not shown) that is rotationally driven, rotationally stopped, and rotationally driven in the forward and reverse directions, a drive unit 2 that incorporates a winding drum that is rotationally driven by the motor, a speed reducer, a brake, and a counter structure. A guide portion 3 provided with guide rollers 14a, 14b, etc., a bracket 4 provided in an arc around the outer periphery of the drive portion 2, and a suspension support hook 7 attached to the bracket 4 by a bolt 5 so as to be rotatable. One end of the wire 11 is wound around the winding drum, and the wire 11 is fed downward from the guide portion 3; the lifting hook 12; the fixing hook 13 that fixes the end of the wire 11 to the end of the bracket 4; It has.
[0015]
As shown in FIG. 3, the bracket 4 is formed by positioning the two plate-like bodies 4a and 4b so as to face each other and fixing them to the outer surface of the drive unit 2, and the bolt 5 is attached to the plate-like bodies 4a and 4b. The formed insertion hole and the coil portion of the torsion spring 9 are inserted and fixed by the nut 6 so as not to come out.
[0016]
The lifting / lowering hook 12 includes a pulley 12a that wraps the wire 11 halfway and a hook portion 12b that suspends a load. The pulley 12a has a groove formed on the outer periphery thereof, and the wire 11 is fitted therein. . As shown in FIG. 3, the suspension support hook 7 includes a U-shaped rotating portion 7a and a suspension support hook portion 7b for hanging on a shaft 8 provided on a traveling member that traverses a stand (not shown). I have.
[0017]
The torsion spring 9 may be a plate spring or a compression coil spring, and the configuration and operation of the torsion spring 9 will be described in detail later.
[0018]
On the other hand, a switch device (not shown) is connected to the drive unit 2 via an electric wire so that the motor can be rotated and stopped, and the rotation direction can be switched by operating the switch device. The winding drum is configured to rotate by the motor. One end of the wire 11 is wound around the winding drum, and in other words, the rotation direction of the motor is switched by the rotation of the winding drum. Thus, the wire 11 is wound up or unwound by unwinding.
[0019]
One end of the wire 11 is wound around a take-up drum (not shown) via the guide portion 3 as described above, but the other end is half-turned on a pulley 12a that constitutes a lifting hook 12 that lifts and lowers the load in a suspended state. After being wound, it is fixed to the other end of the bracket 4 via the fixing hook 13, that is, the left end in FIG. A pin 6 is stretched over the other end of the bracket 4, and a fixing hook 13 that fixes one end of the wire 11 is hooked on the pin 6.
[0020]
Therefore, the other end of the wire 11 is fixed to the other end of the bracket 4, but the wire 11 is wound or fed out by controlling the rotation direction of the motor. By this operation, the elevating hook 12 is raised and lowered, and the load hooked on the hook portion 12b constituting the elevating hook 12 can be raised and lowered.
[0021]
Next, the torsion spring 9 will be described. The torsion spring 9 is obtained by twisting a wire-shaped spring material and has elasticity in the direction in which both end portions open to each other. The torsion spring 9 is inserted into the coiled portion by inserting the bolt 5 and attached to the hoist 1, and one end 9 a is brought into contact with the pin 2 a provided on the side surface of the drive unit 2, and the other end 9 b that is bent is suspended and supported. The side surface of the hook 7 is in contact with the side surface of the rotating portion 7a. According to this mounting structure, the torsion spring 9 has the coiled portion through which the bolt 5 is inserted as the center, and both end portions 9a and 9b always open outwardly, and the drive portion is configured integrally by this elasticity. 2 and the guide portion 3 and the suspension support hook 7 are both energized. Therefore, the drive unit 2 and the guide unit 3 are biased counterclockwise around the bolt 5, and the suspension support hook 7 is biased clockwise around the bolt 5.
[0022]
In a state where the hoist 1 is not suspended, the suspension support hook 7 is light with respect to the hoist 1, so that the suspension support hook 7 is rotated by the elasticity of the torsion spring 9, as shown in FIG. It is inclined with respect to the vertical line a as shown by the angle θ.
[0023]
When laying the hoist 1, as shown by the imaginary line in FIG. 1, the suspension support hook 7 is hung on the shaft 8 or the like of a traveling member traversing the ceiling. As shown in FIG. 1, when the entire hoist 1 is suspended after the suspension support hook 7 is hung on the shaft 8, the entire suspension support hook 7 is aligned with the vertical line a shown in FIG. It rotates in the direction along. In the state where the hoist 1 has been laid, in other words, in the state where the hoist 1 is suspended on the shaft 8 or the like, the position of the suspension support hook 7 that was originally in the position indicated by the solid line in FIG. To be along the vertical line a.
[0024]
In this state, the wire 11 hangs under the hoist 1, but since the weight of the lifting / lowering hook 12 is applied, the wire 11 has a certain tension, and the pulley 12a is rotatable, so that the lifting / lowering hook 12 is V-shaped. It will be located in the lowermost part of the wire 11 folded back.
[0025]
What should be noted here is the action of the torsion spring 9. That is, the fact that the suspension support hook 7 is along the vertical line a means that the other end 9b of the torsion spring 9 is bent over the vertical line a, and this is because the fulcrum of the torsion spring 9 is at the one end 9a. The one end 9a strongly biases the drive unit 2 (the entire hoist 1) in response to this approach. Accordingly, the entire hoist 1 is rotated counterclockwise about the bolt 5, and the main part of the hoist 1 is kept almost horizontal. For this reason, even when the wire 11 is wound up or fed out reversely, the fixing position of the wire 11 by the fixing hook 13 and the feeding position of the wire 11, that is, the feeding position from the guide portion 3 are not shifted. The position of the lifting hook 12 does not change.
[0026]
On the other hand, the lifting / lowering hook 12 is lifted / lowered by motor control as described above. However, when the load is pulled upward, the wire 11 is wound up, so that the entire length of the wire 11 exposed to the outside is shortened. On the other hand, when lowering the lifting hook 12 for unloading, the wire 11 is fed out, so that the entire length of the wire 11 exposed to the outside becomes long. However, coupled with the fact that the main part of the hoist 1 is always kept horizontal and the lifting hook 12 is always positioned at the lowest end regardless of the length of the wire 11, the lifting hook 11 is always positioned on the locus b. Is done.
[0027]
That is, the hoist 1 according to the present embodiment is always located on the locus b regardless of the load applied to the hoist 1 and whether the lifting / lowering hook 12 is lifted / lowered. Therefore, the lifting / lowering hook 12 may swing during cargo handling. In addition, the safety of cargo handling work can be improved.
[0028]
Note that the pair of guide rollers 14a and 14b provided at the lower portion of the guide portion 3 is not possible because the posture of the hoist 1 is held horizontally as described above, so that the weight of the wire 11 is uniformly applied. The possibility of breakage due to the load is reduced, and the guide to the take-up roller can be performed smoothly.
[0029]
【The invention's effect】
As described above, the hoist according to the present invention is provided with a torsion spring between a hoist body such as a drive unit and a suspension support hook that is rotatably attached to the hoist. When the entire hoist is suspended using the suspension support hook by bringing one end of the suspension into contact with the side surface of the drive unit, that is, the hoist body and the other end contacting the side surface of the suspension support hook. The torsion spring urges the side surface of the drive unit by its own elasticity with the side surface of the suspension support hook as a fulcrum, in other words, urges the hoist body so that the posture of the entire hoist is maintained horizontal. It has become.
[0030]
When carrying out the cargo handling work with the hoist, the motor arranged in the hoist body is driven to feed the wire, the lifting hook is lowered, the load is suspended and the wire is taken up. Since the state is maintained, the wire feeding position and the fixing position do not fluctuate, and the lifting / lowering hook rises without being displaced on the same trajectory as when it is lowered, thereby preventing the lifting / lowering hook and the luggage from swinging. .
[0031]
Therefore, the danger of the load colliding with the worker or the worker's hand being caught during cargo handling is reduced, and the safety of the cargo handling work is improved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a hoist to which the present invention is applied.
FIG. 2 is a partially cutaway side view showing the configuration and operation of a hanging support hook.
FIG. 3 is a partially cutaway side view showing the configuration and mounting configuration of a torsion spring.
FIG. 4 is a schematic configuration diagram showing an example of a conventional hoist.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hoist 2 Drive part 3 Guide part 4 Bracket 5 Bolt 7 Wire 7a Rotating part 7b Hook part 8 Wire 9 Torsion spring 9a One end 9b The other end 11 bent 12 Wire 12 Lifting hook 12a Pulley 12b Hook part 13 Fixed hook 14 Luggage a Vertical line b Trajectory

Claims (1)

A drive unit (2) including a motor whose rotational drive, rotation stop and rotational direction are controlled, and a winding drum that is rotationally driven by the motor, and a wire that is wound and fed by the rotational driving of the winding drum ( 11), a lifting / lowering hook (12) that moves up and down in response to winding and unwinding of the wire, and a suspension support hook (7) that is rotatably attached to one end of the outer surface of the drive unit. In the hoist (1)
A torsion spring (5) having one end abutting on the outer surface of the drive unit (2) and the other end abutting on the side surface of the suspension support hook (7) is provided, and the suspension support hook is interposed through the suspension support hook. When the entire hoist is suspended, the entire hoist is held horizontally by the elasticity of the torsion spring with the suspension support hook as a fulcrum.

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