JPH05317129A - Lifting device - Google Patents

Abstract

PURPOSE:To detect such a fact that an article is caught between a cabinet and a lifting shelf, by a method wherein safety switches are respectively provided on the front and rear edges of a bottom plate of the lifting shelf, which moves up and down inside a cabinet, and covered with U-shaped safety plate, and the front or rear safety switch is activated when pressure is exerted on the safety plate from above or below. CONSTITUTION:A lifting device 3 and a controller 4 are installed in a cabinet 1 mounted on a wall 14. A lifting shelf 2 is lowered from the inside of the cabinet 1 by manipulating an operation switch 5. A first safety switch 11 is mounted ion the rear edge of a bottom plate 2-a of the lifting shelf 2 and a second safety switch 12 on the front edge. A safety plate 9 with a U-shaped bent at the front end is attached on the rear face of the bottom plate 2-a and extended from the rear edge up to the front edge of the bottom plate 2-a so as to cover the first and second safety switches 11 and 12. The first safety switch 11 is activated by a pressure from below, and second safety switch 12 by a pressure from above. Thereby, an article being caught between the lifting shelf 2 and the cabinet 1 or the lifting shelf 2 being tilted is easily detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device.

[0002]

2. Description of the Related Art A conventional lifting device of this type is shown in FIGS.
As shown in FIG. 1, a storage cabinet 1 fixed to a wall surface 14 and an elevating shelf 2 on which articles are placed in the storage cabinet 1.
And a drive device 3 for elevating the elevating shelf 2 with the wire 8.
And a control unit 4 for controlling the raising and lowering of the elevating shelf 2, and an operation switch 5 for raising, lowering, and stopping the elevating shelf 2 outside the storage cabinet 1. Safety switch 1 on the bottom of the bottom of shelf 2
0 is provided, and a plate-like safety plate 6 is provided to cover the lower front surface of the storage cabinet 1 and the lower surface of the bottom surface of the elevating shelf 2 so that the safety switch 10 operates in response to pressure from above and below.

[0003]

However, in the above-mentioned structure, since the safety switch 10 is arranged in each of the storage cabinet 1 and the elevating shelf 2, the mounting work is troublesome and the cost is high. Had.

The present invention solves the above conventional problems, and an object thereof is to simplify the safety mechanism and reduce the cost.

[0005]

In order to achieve the above object, the lifting device of the present invention is provided with a first safety switch on the rear surface of the bottom surface of the lifting shelf which can be operated against pressure from below.
A second safety switch that can be operated in response to pressure from above is provided on the front surface of the upper surface of the bottom surface of the elevating shelf.

[0006]

In the lifting device of the present invention, the first safety switch is arranged on the rear surface of the bottom surface of the lifting shelf, and the second safety switch is arranged on the front surface of the bottom surface of the lifting shelf facing the lower lower part of the storage cabinet. The first and second safety switches are linked with the plate-like safety plate that covers the lower surface, front surface and upper surface of the bottom of the lift shelf, and the second safety switch on the upper surface is used for pressure from above. Since the operation is configured so that the first safety switch on the rear surface is operated in response to pressure from below, the unit is made into one unit, so that the assembling property is improved and the cost can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1, 2 and 3, the storage cabinet 1 is fixed to the wall surface 14. Storage cabinet 1
An elevating shelf 2 for placing an article therein, a drive device 3 for elevating the elevating shelf 2 and a control unit 4 for controlling the drive device 3 are arranged. The drive unit 3 and the control unit 4 are fixed on the upper parting plate 7 inside the storage cabinet 1. The elevating shelf 2 is connected to the driving device 3 by the wire 8 and can be moved up and down by the driving device 3. The first safety switch 11 and the second safety switch 12 are arranged on the front surface of the bottom surface 2-a of the elevator shelf 2 and the front surface of the bottom surface 2-a. A plate-like safety plate 9 covering the front surface and the front portion of the upper surface is moved up and down so that the second safety switch is operated for pressure from above and the first safety switch is operated for pressure from below. It is provided in a U-shape on the bottom surface 2-a of the shelf 2. Limit switches are used as the first safety switch 11 and the second safety switch 12. The safety plate 9 and the bottom surface 2-a of the lift shelf 2 are connected by a spring 15, and when there is no pressure from above and below, the first and second safety switches 11 and 1 are provided.
Reference numeral 2 is a closed state, and the second safety switch 12 is open while pressure is applied from above, and the first safety switch 11 is open while pressure is applied from below. An operation switch for raising, lowering, and stopping the lifting shelf 2 is provided on the front surface of the storage cabinet 1.

Next, the control circuit will be described. In FIG. 3, the drive unit 3 is composed of a reversible motor, and by operating the operation switch 5, the control unit 4 is connected to the contact A.
Alternatively, when connected to the contact point B and connected to the contact point A, the elevating shelf 2 descends, and when connected to the contact point B, the elevating shelf 2 rises. When the first safety switch 11 is opened while the contact A is energized, the drive device 3 is stopped. At the same time, when the second safety switch 12 is opened while the contact B is energized, the drive device 3 is stopped.

In the above structure, when pressure is applied to the safety plate 9 while the elevator shelf 2 is being raised, that is, between the lower front portion of the storage cabinet 1 and the upper front portion of the bottom surface 2-a of the elevator shelf 2. When sandwiched, the second safety switch 12 operates to stop the lifting of the elevating shelf 2. Similarly, when pressure is applied to the safety plate 9 during the lowering of the elevating shelf 2, that is, when an article is sandwiched between the lower surface of the bottom surface 2-a of the elevating shelf 2 and an object therebelow, the first safety switch. 11 works to stop the lowering of the elevating shelf 2.

As described above, the first safety switch 11 and the second safety switch 12 are provided on the rear surface and the upper front portion of the bottom surface 2-a of the elevating shelf 2, so that the elevating shelf 2 is lifted by one unit. , It is possible to perform a safe automatic stop in case of an abnormality due to overload when descending.

[0012]

As described above, according to the present invention, since the safety switch that operates when pressure is applied to each of the ascending and descending shelves is provided on the bottom surface of the ascending / descending shelf, the information that the article is sandwiched is not detected. The obtained information is taken into the control unit to control the driving device to improve the safety and the safety switch is provided on one side, so that the assembling of the safety mechanism is improved and the cost is reduced. It has an effect.

[Brief description of drawings]

FIG. 1 is a side sectional view of a lifting device showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the same main part.

FIG. 3 is a circuit diagram of the lifting device.

FIG. 4 is a side sectional view of a conventional lifting device.

FIG. 5 is a side sectional view of the same main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage cabinet 2 Elevating shelf 2-a Bottom part 3 Drive device 4 Control part 9 Safety plate 11 First safety switch 12 Second safety switch

Claims (1)

[Claims] 1. A storage cabinet, an elevating shelf for placing articles in the storage cabinet, a drive device for elevating the elevating shelf, a controller for controlling the elevating and lowering of the elevating shelf, and a rear surface of the bottom surface of the elevating shelf. The first safety switch arranged, the second safety switch on the upper front part of the bottom surface of the lifting shelf facing the lower front part of the storage cabinet, and the second safety switch on the bottom part of the lifting shelf linked with the first and second safety switches. It is equipped with a plate-shaped safety plate that covers the lower surface, the front surface, and the front surface of the upper surface.The safety plate operates the second safety switch on the upper surface for pressure from above, and the second safety switch on the rear surface for pressure from below. An elevating device configured to operate the first safety switch.