JPH0519520Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is a method for separating the outdoors and indoors from the entrance and exit of forklifts, other work vehicles, and people for the purpose of noise isolation, heat insulation, etc. The present invention relates to a door device for quickly opening and closing a door. More specifically, in order to open and close the door more quickly than conventional door mechanisms, a door curtain made of flexible material is wound around a winding drum to quickly open and close the door. This relates to an upper type door device.

(Prior Art) An example of this type of roll-up door device is the invention described in US Pat. No. 3,878,879. The invention of the US patent is a retractable door curtain 1 made of a flexible material as shown in FIGS. 10 and 11.
, a pair of left and right vertical frames 2, 2, a horizontal frame 3 fixed to the upper end of the vertical frame, a winding drum 4 equipped on the horizontal frame, a motor 5 for driving the rotation of the drum, and one end of the horizontal frame 3. A pulley 8 is fixed to the lower end of the door curtain 1 and whose other end is integral with the winding drum 4.
This is a roll-up type door device comprising a door curtain drive mechanism 10 which is fixed to a movable pulley 6 and a rope 9 wound around a fixed pulley 7. In other words, the wound rope 9 is configured to form a closed loop together with the door curtain 1 and the pulley 8.

(Problem to be solved by the invention) It is desirable that the raising and lowering speed of the door curtain be as fast as possible considering the traveling speed of the forklift, but it is also important to note that Since the door curtain may have a curved surface in the vertical direction, the lifting speed must be balanced with the rope tension. However, the device described in the above-mentioned US patent publication cannot meet the above requirements because the movable pulley is urged downward by a weight and the rope tension is always constant.

The present invention has been made in view of this point, and aims to eliminate the drawbacks of the conventional technology by providing a configuration that can balance the lifting speed of the door curtain and the rope tension. It is.

(Means for Solving the Problems) In order to achieve the above object, the present invention makes it possible to adjust the tension of the rope. Specifically, as shown in FIG. 1, a pair of vertical frames 2, 2 erected on both left and right sides of the door opening, and a gap between the upper ends of the vertical frames 2, 2 at the upper edge of the door opening. a horizontal frame 3 installed on the horizontal frame 3; a winding drum 4 having a horizontal rotating shaft mounted on the horizontal frame 3; a motor 5 for rotationally driving the winding drum 4; The winding drum 4 is attached to the winding drum 4 and is driven by the motor 5.
A door curtain 1 is wound around the winding drum 4 and raised and lowered by the rotation of the winding drum 4 to open and close the door opening. A movable pulley 6 and a fixed pulley 7, which are fixed to a pulley 8 that is arranged to rotate integrally,
The present invention is based on a roll-up type door device having a rope 9 wound around a rope 7. Then, a locking fitting 11 is attached to the movable pulley 6 around which the rope 9 is wound,
A plurality of locking pins 13a, 13a, . . . are provided projecting from the locking metal fitting 11 at intervals in the vertical direction.
Further, a downward urging force is applied to the movable pulley 6 between the floor portion 12 of the door opening and one of the plurality of locking pins 13a, 13a, . A spring body 13b that applies tension to the rope 9 is stretched around the rope 9, and the tension applied to the rope 9 can be adjusted by selecting a locking pin 13a to which the spring body 13b is locked. .

(Function) With the above configuration, in the present invention, the door curtain 1 is raised or lowered as the winding drum 4 is driven in the forward or reverse direction by the forward or reverse rotation of the motor 5 and as the rope 9 moves up and down. At this time, rope 9
Since the movable pulley 6 around which the movable pulley 6 is wound is urged downward by the elasticity of the spring body 13b, a tension force is applied to pull the door curtain 1 downward, and the door curtain 1 is maintained in an extended state and aligned with a vertical plane. Become. The elasticity of the spring body 13b is adjusted by changing the locking position between the locking pin 13a and the upper end of the spring body 13b, and is selected to a position that maintains the door curtain 1 in a vertical plane. Further, when the door curtain 1 is moving up and down, the spring body 13b expands and contracts to finely adjust the tension of the rope 9 to maintain the door curtain 1 in a vertical plane at all times.

(Example) An example of the roll-up door device of the present invention will be described below based on FIGS. 1 and 2.

This roll-up type door device includes a door curtain 1, a pair of left and right vertical frames 2, 2, a horizontal frame 3 provided in the form of a bridge over the vertical frames 2, a winding drum 4, a motor 5 for driving drum rotation, and The door curtain drive mechanism 10 and the like are similar to those of the conventional device, and one end of the rope 9 wound around the movable pulley 6 and fixed pulleys 7, 7 is connected to the door curtain 1.
In addition, the other end is fixed to a pulley 8 which rotates integrally with the drum 4, thereby forming a closed loop.

In the present invention, means for adjusting the tension of the door curtain 1 is connected to the door curtain drive mechanism 10. This will be explained with reference to FIGS. 1 and 2. A group of a plurality of locking pins 13a are provided at the lower end of a locking metal fitting 11 integral with the support shaft 6a of the movable pulley 6 at intervals in the vertical direction. On the other hand, the lower end of the spring body 13b is engaged with the stopper 14 fixed to the floor 12, and the hook 13c at the upper end of the spring body 13b is engaged with any of the above-mentioned retaining pins of the group of retaining pins 13a. By changing the amount of extension ("" in FIG. 2) of the spring body 13b, the elasticity can be adjusted. As a result, door curtain 1
Depending on the lifting speed of the door curtain 1, the locking position can be selected such that the tension of the rope 9 that maintains the door curtain 1 in a vertical plane can be obtained. Further, when the door curtain 1 moves up and down, the spring body 13b expands and contracts, and the tension of the rope 9 for always maintaining the door curtain 1 in a vertical plane state is finely adjusted.

The door curtain drive mechanism 10 is the same as the conventional device except for the above-mentioned mechanism, and a rope 9 is wound around a plurality of fixed pulleys 7 in addition to the movable pulley 6, and both ends of the rope 9 are connected to the door curtain 1. It is fixed to the lower end of the winding drum 4 and is installed inside each of the left and right vertical frames 2.

The structure of the left end portion of the door curtain 1 will be explained with reference to the cross-sectional plan view of FIG. 3 and FIG. A frame guide member 2a and a cover guide member 2b are provided inside the vertical frame 2, and a substantially U-shaped guide member 2c is provided between the two to form a guide groove. An elastic member 1a made of the like is inserted into the guide groove to guide the vertical movement of the door curtain 1. The opening of the frame guide member 2a through which the end of the door curtain 1 is inserted, the frame guide member 2a and the cover guide member 2b.
Windproof brushes 2d and 2d are mounted vertically on the side walls of the door, and the lip-shaped ends of the brushes elastically press against one side of the door curtain to block outside air from entering the room. , 1b is a reinforcing plate.

In addition, in the prior art, as shown in FIGS. 10 and 11, a guide mechanism 22 including a guide roller, a guide rail, and a weight 21 is provided, and the door curtain 1 is always securely engaged with the vertical frame 2. Therefore, if a forklift or the like comes into contact with the door curtain 1, the door curtain 1 will not be able to escape and the door curtain 1 will be destroyed. In this case, when the elastic member 1a receives an impact from the direction of arrow A in FIG. 5, it can easily come out from the guide groove in the direction of arrow B, and the door curtain 1 can be bent. hand,
Destruction of the door curtain 1 due to contact with a forklift or the like can be prevented.

The door curtain 1 is made of a flexible material, hangs down in a flat plate shape, and has a structure that can be freely curved in the vertical direction so as to be wound up on a winding door arm 4. For example, a structure in which a high-tension cloth (using nylon, Kevlar fiber, etc.) is overcoated with polyvinyl chloride or epoxy resin, and a fiber structure in which the warp yarns are thinner than the weft yarns and can be freely curved in the vertical direction. The thickness should be approximately 2 to 4 mm.

Further, as other embodiments of the door curtain 1, FIGS.
As shown in the figure, a cold-proof door may be made with a composite structure of a sponge layer 1c and a fabric 1d to improve heat insulation.

Providing a transparent window portion at one or more locations on the door curtain 1 allows one to see through the front and rear of the door, which is advantageous in that collisions with obstacles or oncoming forklifts can be prevented.

Further, when a forklift is located in a certain range in front and behind the door curtain 1, a control device is provided that automatically rotates the motor 5 to wind up the door curtain 1 and "door open" the door curtain 1. Note that even if the motor 5 is located within the above-mentioned certain range, the control device is configured to automatically stop the motor 5 when the elastic member 1a is out of the guide groove and when the ground detection bar 15 provided at the lower end of the door curtain 1 is activated. Set up the program.

FIGS. 7 and 8 show an example in which a ground detection bar 15 is provided on the door curtain 1, and a flexible tube 18 surrounds a lower end bar 17 that is integrally fixed to the lower end of the door curtain 1. is divided into a plurality of pieces in the longitudinal direction of the door curtain 1, a weight iron piece 19 is inserted into each of the plurality of flexible tubes 18, and a limit switch 20 is interposed between the iron piece 19 and the lower end bar 17. When the flexible tube 18 comes into contact with the ground, the iron piece 19 rises and comes into contact with the limit switch 20, which activates the switch, as shown in FIG. It is beginning to be detected. Note that the grounding detection bar 15 may not be provided.

(Effects of the invention) As described above, according to the invention, a locking fitting is attached to a movable pulley around which a rope is wound, and a plurality of locking fittings are attached to the locking fitting at intervals in the vertical direction. a spring body having a protruding pin and applying a downward biasing force to the movable pulley between the floor of the door opening and one of the plurality of locking pins to tension the rope; The tension applied to the rope can be adjusted by selecting the locking pin to which the spring body is locked.
The elasticity of the spring body is adjusted by changing the locking position of the locking pin and the upper end of the spring body, and the position is selected such that the door curtain is maintained in a vertical plane, and the door curtain is moved up and down. In some cases, the spring body expands and contracts to finely adjust the tension of the rope that maintains the door curtain in a vertical plane, so the elasticity that the spring body exerts on the movable pulley can be changed as appropriate. By selecting a rope tension that is balanced with the winding force of the winding drum by the motor, it is possible to simultaneously achieve rapid lifting and lowering of the door curtain and prevention of curvature of the door curtain.

[Brief explanation of the drawing]

Figure 1 is a front view of a roll-up door device implementing the present invention (the front part of the vertical frame is removed);
Figure 2 is a vertical sectional view taken along the line shown in Figure 1;
Figures 5 to 5 partially show the locked state of the door curtain and the vertical frame, Figure 3 is a cross-sectional plan view taken along the line in Figure 1, and Figure 4 is the part surrounded by the dashed line in Figure 1. The third enlargement of the lower end of the door curtain
Figure 5 is a cross-sectional view similar to Figure 3 showing the action, Figure 6 is a schematic diagram showing the cross-sectional shape of a part of the door curtain, Figure 7 is a grounding detection bar. FIG. 8 is a longitudinal sectional view, and FIG. 9 is a schematic front view.
10 is a front view showing a roll-up door device of the prior art, and FIG. 11 is a side view of the same. 1... Door curtain, 2... Vertical frame, 3... Horizontal frame, 4... Winding drum, 5... Motor, 6
...Movable pulley, 7...Fixed pulley, 8...Pulley, 9
... Rope, 11 ... Locking metal fitting, 13a ... Locking pin, 13b ... Spring body.

Claims (1)

[Claims for Utility Model Registration] A pair of vertical frames erected on both left and right sides of a door opening, a horizontal frame installed between the upper ends of the vertical frames at the upper edge of the door opening, and the horizontal frame. a winding drum having a horizontal rotating shaft and a motor for rotationally driving the winding drum; one end of the winding drum is attached to the winding drum, and the winding drum is driven by the motor; a door curtain that is wound around the winding drum and raised and lowered by the rotation of the winding drum to open and close the door opening; In the winding type door device, which has a movable pulley and a rope wound around a fixed pulley, the movable pulley is fixed to a pulley provided, and a locking metal fitting is attached to the movable pulley around which the rope is wound. , a plurality of locking pins are protruded from the locking metal fitting at intervals in the vertical direction,
A spring body is stretched between the floor of the door opening and one of the plurality of locking pins, and applies a downward biasing force to the movable pulley to tension the rope. A roll-up door device characterized in that the tension applied to the rope can be adjusted by selecting a locking pin to which the spring body is locked.