JPH0544994U - Electric lifting device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the key 14 from falling off without using a separate component for preventing the key from falling off. [Structure] A key groove 15 into which a key 14 is fitted is provided on an outer surface of a drive shaft 13 of an electric motor 12 along an axial direction. Winding drum 16
A key groove (23) into which the key (14) is fitted is provided on the inner surface of the fitting hole (17) along the axial direction. The key groove 23 of the fitting hole 17 closes both ends in the axial direction, and holds the key 14 in the key groove 23 in a fitted state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric lifting device that lifts and lowers an electric device such as a lighting device and a speaker installed in a high place such as a gymnasium, a ceiling of a factory or a warehouse.

[0002]

[Prior Art]

 Electrical equipment installed in high places such as gymnasiums, factories and warehouse ceilings is provided so that it can be raised and lowered for easy maintenance and inspection.

In a conventional electric lifting device, a lifting device main body is installed on a ceiling or the like, and an electric motor and a winding drum for winding and winding a cord by forward and reverse rotation driving of the electric motor are arranged in the lifting device main body. However, the rope that is fed out from this winding drum is connected to an elevating part equipped with electrical equipment.

FIG. 5 shows a connection structure between the drive shaft 2 and the winding drum 3 of the conventional electric motor 1. A key 7 is provided between a key groove 4 provided on the outer surface of the drive shaft 2 along the axial direction and a key groove 6 provided on the inner surface of a fitting hole 5 that is fitted to the drive shaft 2 of the winding drum 3. When fitted, the rotation of the drive shaft 2 is transmitted to the winding drum 3 via the key 7.

[0005]

[Problems to be solved by the device]

 However, in the conventional connecting structure of the drive shaft 2 and the winding drum 3, both the key grooves 4 and 6 of the drive shaft 2 and the fitting hole 5 are opened at the axial end portions, so that the rotary shaft during rotation drive The key 7 may fall off the end opening due to vibration or the like. Therefore, it is necessary to prevent the key 7 from falling off by closing the end openings of the key grooves 4 and 6 with separate parts for preventing the key from falling off.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric lifting device capable of preventing a key from falling without using a separate component for preventing the key from falling. It is a thing.

[0007]

[Means for Solving the Problems]

 The present invention is directed to a lifting device main body having an electric motor and a winding drum that winds and unwinds a rope by forward and reverse rotation driving by the electric motor, and a rope that is unwound from the winding drum. An elevating part that is connected to the elevating part to elevate and lower by winding and unwinding the cord, and the electric motor has a drive shaft into which the winding drum is fitted, and a key into which the key is fitted to the outer surface of the drive shaft A groove is provided along the axial direction, and the winding drum has a fitting hole for fitting with the drive shaft, and a key groove for fitting the key is axially formed on the inner surface of the fitting hole. A key groove on either side of the drive shaft and the fitting hole closes the axial end to hold the key in the fitted state, while the other key groove opens the axial end. Is.

[0008]

[Action]

 In the present invention, the rotation of the drive shaft is transmitted to the take-up drum through the key fitted between the key groove of the drive shaft and the key groove of the fitting hole of the take-up drum. The key is securely held in the key groove of either the drive shaft or the fitting hole whose axial end is closed, so that the key is securely prevented from falling off.

[0009]

【Example】

 Hereinafter, a configuration of an embodiment of the present invention will be described with reference to FIGS.

In the figure, 11 is a lifting device main body, which is installed at a high place such as a gymnasium, a ceiling of a factory or a warehouse.

An electric motor 12 is attached to the inside of the lifting / lowering device body 11, and a drive shaft 13 which is driven to rotate forward and backward from the end surface of the electric motor 12 is provided in a protruding manner. On the outer surface of the drive shaft 13, there is provided a key groove 15 having a square cross section in which a key 14 having a square pole shape is fitted, along the axial direction. The end of the key groove 15 in the axial direction is the drive shaft 13. There is a communication opening to the tip of the.

A take-up drum 16 is attached to the drive shaft 13. The take-up drum 16 has a cylindrical boss 18 having a fitting hole 17 into which the drive shaft 13 is fitted, and a peripheral surface. A pair of drum portions 20 for winding the rope 19 and a pair of flange portions 21 on both sides of the drum portion 20 are integrally formed. A pair of drum portions 20 for winding the rope 19 are formed between the drum portion 20 and the flange portion 21. The winding unit 22 is formed. The collar portion 21 located between the pair of winding portions 22 is shared and functions as a partition plate.

Further, on the inner surface of the fitting hole 17, there is provided a key groove 23 having a square concave cross section for fitting the key 14 along the axial direction, and both axial end portions of the key groove 23 are closed. Then, the key 14 is held in the key groove 23 in a fitted state.

The one end of the key 14 on the electric motor 12 side is formed with a curved surface portion 14a continuous to both side surfaces, and the curved surface portion 23a is formed on at least one end of the key groove 23 on the electric motor 12 side correspondingly. Has been done.

Further, the boss 18 is provided with a screw hole 24 orthogonal to the axial direction and penetrating the inner and outer surfaces of the boss, and a set screw 25 is screwed into the screw hole 24 to set the set screw 25. Is pressed against the drive shaft 13, and the winding drum 16 is fixed to the drive shaft 13.

Further, the cord 19 is made of one wire, and each end is connected and fixed to each winding portion 22 of the winding drum 16, and from each winding portion 22, the slack detecting means 26 and the lifting device. The guide pulley 27 is rotatably attached to the main body 11 in a horizontal direction, and the guide pulley 27 is attached to both sides of a lock case 51 to be described later. ing.

In the slack detecting means 26, a detecting lever 30 is swingably supported by a bracket 29 fixed to the lifting / lowering device body 11, and a guide is installed between the detecting lever 30 and the tip of the detecting lever 30. The cord 19 is passed between the shaft 31 and the switch 32, which faces the lower side of the detection lever 30 and is activated by the downward swing of the detection lever 30. As will be described later, the switch 32 stops the electric motor 12 when it is operated when the elevating part 41 is descending.

The elevating part 41 is connected to the cord 19 led out below the elevating device main body 11, and is raised and lowered by the winding and unwinding operation of the cord 19. The elevating part 41 is provided with a cylindrical case 42. On the lower surface of the case 42, electric devices such as lighting equipment and speakers are attached, and on the upper surface, a plurality of elevating parts (not shown) electrically connected to the electric devices are provided. Part contacts are provided in a protruding manner, and locking projections 43 are provided on both side surfaces.

The lock case 51 is attached to the center of the lower surface of the lifting / lowering device main body 11, is formed in the shape of a box that opens downward, and has cutouts 52 on both sides, and both side edges of the cutout 52 are formed. A guide part 53 is formed on the upper surface of the elevating part 41 so that the elevating part 41 can move up and down in parallel with the peripheral surface of the case 42. The portion 54 is formed so as to expand downward.

A movable plate 55 is arranged in the lock case 51. The movable plate 55 is supported by a plurality of rods 56 provided in the lock case 51 so as to be movable up and down and a spring (not shown). Is urged downward by. The movable plate 55 is provided with a power supply contact 57 with which the elevating part contacts when the elevating part 41 moves up.

Further, a support shaft 59 provided with a lock claw 58 that engages and disengages with the locking projection 44 of the elevating part 41 is selectively rotatable between the lower portions on both sides of the notches 52 of the lock case 51. It has been installed.

Next, the operation of this embodiment will be described.

To assemble the winding drum 16 to the drive shaft 13 of the electric motor 12 during assembly, the key 14 is fitted into the key groove 23 of the fitting hole 17 of the winding drum 16, and the winding drum 16 is assembled. The fitting hole 17 of the drive shaft 13 is fitted into the end of the drive shaft 13, and the winding drum 16 is moved toward the electric motor 12. After fitting the opening end of the groove 15 and moving the winding drum 16 toward the electric motor 12 to a predetermined fitting position, tighten the set screw 25 that is screwed to the boss 18 to the drive shaft 13. , The winding drum 16 is fixed to the drive shaft 13.

When the key 14 is fitted in the key groove 23 of the fitting hole 17 of the take-up drum 16, the direction of the key 14 is changed by fitting the curved surface portion 23a of the key groove 23 and the curved surface portion 14a of the key 14. The sex is fixed. Therefore, when the key 14 fitted and held on the take-up drum 16 side is fitted into the open end of the key groove 15 of the drive shaft 13, the curved surface portion 14a of the key 14 faces the key groove 15, so Even if there is some misalignment in the mating direction, they can be fitted easily.

Then, when the elevating part 41 descends, the rope 19 is paid out from the winding drum 16 by driving the electric motor 12, and the elevating part 41 descends.

At this time, since the elevating part 41 is suspended by the rope 19, tension is applied to the rope 19. Therefore, the detection lever 30 of the slack detection means 26 is swung upward by the rope 19, and the switch 32 is not operating.

Then, when the elevating part 41 descends to the floor surface or the like, slack is generated in the rope 19, so that the detection lever 30 of the slack detection means 26 swings downward, the switch 32 operates, and the electric motor 12 stops. Be stopped.

On the other hand, in order to raise the elevating part 41 from the lowered state, since the cord 19 is wound around the winding drum 16 by the reverse rotation drive of the electric motor 12, the elevating part 41 rises.

Then, the ascending / descending portion 41 comes into contact with the guide portion 53 through the introduction portion 54 of the lock case 51, the shake is suppressed, and ascends substantially in parallel. Then, the plurality of lifting and lowering part contacts of the lifting and lowering part 41 contact the corresponding power supply contacts 57. When the switch (not shown) detects that the ascending / descending portion 41 has reached the fixed ascending position, the electric motor 12 is stopped.

At the fixed rising position of the elevating part 41, the lock claw 58 is engaged with the lower part of the locking projection 44 of the elevating part 41 to prevent the elevating part 41 from falling. The lock claw 58 is adapted to be disengaged from the locking projection 44 when the elevating part 41 descends and descends.

Since both ends of the key groove 23 of the winding drum 16 are closed and the key 14 is fitted and held in the key groove 23, the key 14 is prevented from falling off.

The drive shaft 13 may be configured such that both axial end portions of the key groove 15 are closed and the key groove 23 of the winding drum 16 is opened at the end on the electric motor 12 side. The key 14 is fitted in the key groove 15 of the drive shaft 13, and when the fitting hole 17 of the winding drum 16 is fitted in the drive shaft 13, the key 14 is fitted in the key groove 23 of the fitting hole 17. By doing so, it is possible to prevent the key 14 from falling off, as in the above-described embodiment.

[0033]

[Effect of the device]

 According to the present invention, one of the key groove of the drive shaft of the electric motor and the key groove of the fitting hole of the winding drum closes the axial end portion to hold the key in the fitted state. It is possible to reliably prevent the key from falling off without using separate parts for prevention.

[Brief description of drawings]

FIG. 1 is a sectional view of a winding drum portion showing an embodiment of an electric lifting device of the present invention.

FIG. 2 is a side view of the winding drum.

FIG. 3 is a sectional view of a part of the winding drum.

FIG. 4 is a perspective view of the entire electric lifting device.

FIG. 5 is a cross-sectional view of a winding drum portion of a conventional electric lifting device.

[Explanation of symbols]

 11 Lifting device body 12 Electric motor 13 Drive shaft 14 Key 15 Key groove 16 Take-up drum 17 Fitting hole 19 Rope 23 Key groove 41 Lifting part

Claims (1)

[Scope of utility model registration request] 1. An elevating device main body which is arranged at a high position and has a motor and a winding drum which winds and unwinds a rope by forward and reverse rotation driving by the electric motor, and a rope which is unwound from the winding drum. And an elevating part that is connected to the rope and moves up and down by winding and unwinding the rope. The electric motor has a drive shaft into which the winding drum is fitted, and a key is fitted into the outer surface of the drive shaft. A key groove is provided along the axial direction, and the winding drum has a fitting hole fitted into the drive shaft, and a key groove for fitting the key is axially formed on an inner surface of the fitting hole. A key groove of one of the drive shaft and the fitting hole closes an axial end portion to hold the key in a fitted state, and the other key groove has an axial end portion opened. The electric lifting device.