JPS6344528Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent the lower edge of the door from touching the floor or the upper surface of the threshold when the door is closed, such as the door that opens and closes the entrance/exit or window of a sterile clean room, etc. This invention relates to a door lifting device that lifts a door from a lowered position where the lower edge of the door touches the floor or upper surface of a sill to an elevated position higher than the lowered position.

Such a door lifting device, for example, as described in Japanese Patent Publication No. 55-25257, has a lower hinge pin supported at the bottom of the door end of the door body so that it can move up and down but cannot rotate relative to the door body. A structure is known in which the end of the driven arm of the supported bellcrank is connected to a lower hinge pin, and the end of the driving arm is operatively connected to an eccentric pin operatively connected to the handle via a rod type transmission device.

However, with such a structure, when you let go of the handle, the door naturally falls from the raised position to the lowered position due to its own weight, so it is necessary to keep the handle in the same position with your hand throughout the opening/closing operation. This has the disadvantage that one hand is occupied during opening and closing operations.

Another drawback is that if the handle is inadvertently released or moved during the opening/closing operation, the lower edge of the door may rub against the floor, causing damage to the lower edge of the door and the floor.

In order to solve the above-mentioned drawbacks, the present invention connects the eccentric part of the crank interlockingly connected to the handle and the lower hinge pin with a belt transmission device, and connects the final belt guide of the belt transmission device with the lower hinge pin. The belt of the belt transmission is supported by the door body at a position lower than the driven end of the belt transmission, and the belt of the belt transmission is wound around the final belt guide from below, and the eccentricity of the crank is adjusted by rotating the handle in one direction. The belt of the belt transmission device is rotated so that it is displaced from one lateral side of the crankshaft center to the other lateral side through the top dead center, and the belt of the belt transmission device is wound around the eccentric part of the crank. It is characterized in that the door body is configured to be lifted from a lowered position to a raised position.

Hereinafter, the present invention will be explained in detail based on the drawings.

Figures 1 to 7 illustrate a door lifting device for a single-swing door according to the present invention. An upper hinge pin 4 supported so as to be movable up and down but not relatively rotatable and fixed to the upper part of the door end is connected to the lintel 5 so as to be movable up and down and rotatable,
The lower hinge pin 3 is rotatably supported on the sill 6,
The door body 1 is built so that it can be raised and lowered between a lowered position where its lower edge 7 touches the upper surface of a sill 6 and a raised position higher than that, and can be swung open and closed around the common axis of both hinge pins 3 and 4. .

Reference numeral 8a represents a door end outer frame, and 8b represents a door end outer frame.

A handle 9 is pivotally supported at the intermediate height of the door end of the door body 1, a crank 10 is interlocked and connected to the handle 9, and a driving end 13 of a belt transmission device 12 is connected to an eccentric portion 11 of the crank 10. The driven end 14 of the transmission 12 is connected to the lower hinge pin 3.

The belt transmission device 12 includes a first belt guide 15 consisting of a roller pivotally supported at the lower part of the door edge of the door body 1;
First and second two-stage pulleys 16 and 17 are respectively pivotally mounted on the lower part of the door body 1 near the door end, and second and final belt guides 18 and 19 are formed of rollers. from the eccentric part 11 to the first two-stage pulley 1 via the first belt guide 15
As the driving side belt 20 is wound around the large diameter portion 16a of the belt 6 and wound around the eccentric portion 11, the two-stage pulley 1
6 is configured to be rotated clockwise.

The small diameter portion 16b of the first two-stage pulley 16 and the large diameter portion 17a of the second two-stage pulley 17 are connected to the intermediate belt 2.
1, the second two-stage pulley 17 is interlocked and connected to rotate in the opposite direction to the first two-stage pulley 16.

The driven belt 22 extending from the small diameter portion 17 b of the second two-stage pulley 17 to the driven end 14 is wound around second and final belt guides 18 , 19 disposed at a lower position than the driven end 14 .

When the door body 1 is in the lowered position, the crank 10 is assembled so that the eccentric part 11 is located just to the right of its axis, and by rotating the handle 9 180 degrees counterclockwise, the drive belt 20 is wound onto the eccentric portion 11.

As the driving belt 20 is wound up, the first belt guide 15 and the first two-stage pulley 16 swing clockwise, and the second two-stage pulley 17 swings counterclockwise to rotate the driven belt 22. It is wound around the small diameter portion 17b.

Since the length of the belt path from the belt winding point 23 of the small diameter portion 17b of the second two-stage pulley 17 to the driving side belt winding point 24 of the final belt guide 19 is constant, the second two-stage pulley 17 By winding the driven belt 22 onto the final belt guide 19
The distance between the lower hinge pin 3 supported on the sill 6 is reduced, and the door body 1 is moved to the lowered position (third
(solid line in the figure) to the raised position (dotted chain line in the same figure).

What is important here is that in the middle of rotating the handle 9 and crank 10 by 180 degrees, the eccentric portion 11 passes through the top dead center, the driving belt 20 crosses from the right to the left of the crank axis, and the driving belt When the crank 20 moves to the left of the crank axis, the tension acting downward on the drive belt 20 due to the weight of the door forces the crank 10 counterclockwise.
The door body 1 is automatically locked in the raised position.

In order to lower the door body 1 from the raised position to the lowered position, the handle 9 may be rotated 180 degrees clockwise.

Regardless of whether the door body 1 is raised or lowered, when the drive belt 20 passes through the crankshaft center, the weight of the door body 1 assists the handle 9 to rotate in the rotation operation direction, making the handle operation easier.

In addition, due to the principle of leverage between the large and small diameter parts of the two-stage pulleys 16 and 17, and between the handle 9 and crank 10, the door can be easily operated with a weak force of 1/18th of the door's own weight, for example. .

Incidentally, in order to obtain an amount of winding of the driving belt 20 around the eccentric portion 11 that is, for example, 18 times the lifting amount of the door body 1, the eccentric portion 11 is formed into a plate shape and the driving belt is rotated by 180°. 20 can be rolled up to the required length.

Further, each belt 20, 21, 22 is made of stainless steel.

The present invention is not limited to the above-mentioned embodiments, but can also be applied to double doors, for example. In that case, the door edge joining portions of both door bodies may be constructed as shown in FIG. 8.

Since the present invention is constructed as described above, by rotating the handle in one direction, the belt of the belt transmission device is wound around the eccentric part of the crank, and the final belt guide and the driven end of the belt transmission device are connected to each other. By shortening the distance between , the door body can be lifted from the lowered position to the raised position via the final belt guide using the lower hinge pin connected to the driven end as support,
By rotating the handle in the other direction to let out the belt from the eccentric part of the crank and extending the distance between the final belt guide and the driven end, the door body can be lowered from the raised position to the lowered position. The point of application of the tension of the belt wound around the eccentric part moves transversely from one side of the crankshaft center to the other side during rotation of the handle, and the tension of the belt biases the crank and handle in the direction of rotation. Therefore, even if the handle is released, the door body is locked in the lifted state and does not fall, allowing the operator to use both hands freely after lifting the door, and swinging the door to open and close it. Even if the door is moved, there is no risk of the door and the floor surface or sill rubbing against each other, and damage to the door body or floor surface due to such rubbing can be prevented.

Furthermore, when a two-stage pulley is interposed in the belt transmission device, the large diameter part of the two-stage pulley is interlocked and connected to the handle via the belt and crank, and the small diameter part is connected to the lower hinge pin via the belt.
Due to the principle of leverage between the large and small diameter parts of the two-stage pulley, the operating force of the handle can be reduced, allowing the door body to be raised and lowered easily.

[Brief explanation of the drawing]

1 to 7 illustrate a door lifting device for a single-swing door according to the present invention, and FIG. 1 is a front view, and FIG.
The figure is a perspective view of the main parts, Fig. 3 is a front view of the main parts of the belt transmission, Fig. 4 is a plan view of the main parts of the belt transmission, and Fig. 5 is a front view of the handle and crank. , FIG. 6 is a plan view of the handle and crank, FIG. 7 is a longitudinal cross-sectional view of the door body, and FIG. 8 is a cross-sectional plan view of the door opening of the double door according to the present invention. 1...Door body, 3...Lower hinge pin, 6...
Threshold, 7...Lower edge of door body, 9...Handle, 1
0... Crank, 11... Eccentric part, 12... Belt transmission device, 13... Driving end, 14... Driven end,
16...Two-stage pulley, 16a...Large diameter part, 16b
. . . Small diameter portion, 17 . . . Two-stage pulley, 17a . . . Large diameter portion, 17b .

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a door lifting device that lifts a door from a lowered position where its lower edge touches the floor or the upper surface of a sill to an elevated position higher than the lowered position when the door is opened or closed, A lower hinge pin is supported at the lower part of the butt so that it can move up and down and cannot rotate relative to each other, and a crank is interlocked and connected to a handle that is pivotally supported on the door body.
The driving end of the belt transmission is connected to the eccentric part of the crank, and the driven end is connected to the lower hinge pin, and the final belt guide of the belt transmission is supported on the door body at a lower position than the driven end, and the belt The belt of the transmission device is wrapped around the final belt guide from below, and by rotating the handle in one direction, the eccentric part of the crank moves from one side of the crankshaft center to the top dead center and then to the other side. A door lifting device characterized in that the door body is lifted from a lowered position to a raised position via a final belt guide by rotating so as to be displaced and winding a belt of a belt transmission device around an eccentric portion. (2) In the door lifting device described in claim 1 of the utility model registration, at least one two-stage pulley is interposed in the belt transmission device, and the large diameter part of the two-stage pulley is connected to the handle via the belt and the crank. The belt is connected to the lower hinge pin, and the belt wrapped around the small diameter part is connected to the lower hinge pin.