JPH0732560Y2 - Telescopic tube for elevators such as projectors - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic tube used for a lifting device such as a telescopic tube wire-winding type projector.

[0002]

2. Description of the Related Art Conventionally, when a projector such as a video projector (video projector) or a television set is not normally used, it is raised to a storage position on the upper ceiling side,
A telescopic tube wire winding type lifting device as shown in FIG. 1 is known as a lifting device for a projector or the like that is lowered to an appropriate projection position or the like as needed. That is, the base end telescopic tube 10a of the telescopic telescopic tube 10 which is a square tube (rectangular tube) is fixedly provided on the frame 50 provided on the lower surface of the ceiling slab 40, and the telescopic tubes 10b and 10c are telescopically telescopic. The wire rope 80 having the tip fixed to the projector 30 or the like attached to the end of the telescopic cylinder 10c is connected to the hoist 70 installed on the frame 50 through the pulley 60 above, and the projector 30 or the like is hoisted. The wire 70 is wound up to raise the wire, and is lowered by its own weight.

[0003]

However, since the conventional lifting device is a telescopic telescopic tube of a square tube, there is an advantage that it can be installed by a single (one) multi-step telescopic tube. Since the sliding friction resistance between the telescopic cylinders is large, it is not possible to move up and down smoothly and easily, and vibrations such as deviating sideways are liable to occur, which causes distortion and makes it difficult to move up and down. I can not expect to be a lifting type,
Naturally, there were restrictions on the lifting stroke.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to provide a telescopic cylinder wire hoist type lifting device in which only the tip end of the telescopic cylinder is provided. In a telescopic cylinder for a lifting device such as a projector, characterized in that each linear motion bearing for guiding each telescopic cylinder is provided at each tip of a telescopic multi-stage telescopic cylinder to which a projector or the like is attached.

Next, the present invention will be described with reference to FIGS.
This will be described in detail with reference to FIG.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 2 to 5, reference numeral 1 is a telescopic cylinder 1a, 1
It is a telescopic multi-stage telescopic cylinder by b, 1c, 1d, and 1e. A projector 3 such as a video projector (video projector) or a television set is attached to the tip of only the latest telescopic tube 1e. In view of this, the present invention relates to a telescopic cylinder wire winding type lifting device for guiding the telescopic cylinders 1b, 1c, 1d, 1e to the respective tips of the telescopic multistage telescopic cylinders 1a, 1b, 1c, 1d. Linear motion bearings (eg linear ball bearings) 2
a, 2b, 2c and 2d are provided respectively. And only the base end telescopic cylinder 1a is fixed vertically to the frame 5 provided on the lower surface of the ceiling slab 4 as shown by the chain line in the drawing. Is usually omitted, and only the linear motion bearing 2a at the base end which should be attached to the tip thereof is provided vertically at the illustrated position of the frame 5. In addition, therefore, the most advanced telescopic cylinder 1e in the telescopic multi-stage telescopic cylinder 1 described above.
A wire rope 8 fixed at the tip to a projector 3 or the like attached to the tip of is connected to a hoisting machine 7 installed on the frame 5 via an upper pulley 6. And the projector 3 etc. is the hoist 7
It goes up when the wire is wound up, and goes down due to its own weight.

[0007]

As described above, the telescopic cylinder of the present invention is
Telescopic tube A wire winding type lifting device, in which only the most advanced telescopic tube is provided with linear motion bearings for guiding each telescopic tube at each tip of a telescopic multi-stage telescopic tube with a projector etc. Therefore, each linear motion bearing installed in the sliding part of each telescopic cylinder can significantly reduce the frictional resistance between the telescopic cylinders. Since it does not cause vibration such as blurring, and it does not make it difficult to move up and down due to distortion, so when using it as a lifting device such as a projector, it can be a multi-stage telescopic type with more than 2 steps and 5 steps There is an advantage that a large stroke can be taken.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional lifting device for a projector or the like.

FIG. 2 is an explanatory view of an elevating device using the present invention.

FIG. 3 is an explanatory diagram of the lifting limit of the lifting device using the present invention.

FIG. 4 is an explanatory view of a lowering limit of a lifting device using the present invention.

FIG. 5 is an enlarged explanatory view of the lifting device using the present description.

[Explanation of symbols]

 1,1a to 1e, 10a to 10c Telescopic cylinders 2a to 2d Linear motion bearings 3,30 Projectors, etc. 4,40 Ceiling slabs 5,50 Frames 6,60 Pulleys 7,70 Hoisting machines 8,80 Wire ropes

Claims (1)

[Scope of utility model registration request] Telescopic tube In the wire winding type lifting device, only the most advanced telescopic tube shall be provided with linear motion bearings for guiding each telescopic tube at each tip of the telescopic multi-stage telescopic tube with a projector etc. Telescopic tube for lifting equipment such as projectors.