JP3448700B2 - Overhead door drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the drive of an overhead door disposed at an opening of a building such as a warehouse, a building, a garage, an opening at the rear of a vehicle, and the like. It belongs to the technical field of equipment. 2. Description of the Related Art In general, an overhead door of this type constitutes a door curtain by connecting a plurality of panel bodies in a series, and guide rollers provided at both left and right ends of each panel body are formed by a frame body. The door curtain is configured to be opened and closed by being movably guided by a guide rail provided in the opening. By the way, as an opening / closing drive means of the overhead door, one end of a rope body such as a wire is connected to a panel body located at the lowermost end, and the other end is connected to a winding shaft provided above the opening. Winding type that can be opened and closed by winding and unwinding the body, connecting a trolley to the topmost panel body, and reciprocating the trolley to a trolley rail horizontally provided on the ceiling of the body Various methods have been proposed, such as a trolley type that is configured to move. [0003] Each of these means has advantages and disadvantages. Particularly, in the case of a winding type, the winding shaft rotates even if the closing operation is stopped by hitting an obstacle during the closing operation. There is a problem that the rope body continues to be loosened and the door curtain descends. Further, in the trolley type, if a part or substantially the entirety of the door curtain is stored in a vertical posture, there is a problem that the horizontal movement space of the trolley is small and the door curtain cannot be opened and closed. Therefore, the endless chain is used as an endless chain, the endless chain is hung around a pair of sprockets arranged above and below the opening, and the door curtain is opened and closed by moving the endless chain up and down by forward and reverse rotation of the sprocket. This is proposed in, for example, Japanese Utility Model Laid-Open No. 1-89591. Incidentally, the guide rail of this type of overhead door is not vertical but is inclined upward toward the indoor side (toward the rear of the opening) in order to secure the smoothness of the opening and closing operation while maintaining the airtightness when fully closed. As a result, the connecting portion between the endless chain and the lowermost panel body is shifted toward the indoor side as it moves from the fully closed position to the fully opened direction, and as a result, the substantial length of the endless chain is increased. Changes. Moreover, this change is caused by the general-purpose type in which the top end panel body immediately moves to the side rail portion (storage rail) side of the guide rail when released from the fully closed state. Since the connecting portion is located at the arc-shaped corner portion between the portion and the vertical rail portion, the bias toward the indoor side is promoted. For this reason, if the endless chain length is set to the fully open state, the endless chain is loosened as the fully closed state is reached, impairing smooth chain feed. Conversely, the endless chain length is adjusted to the fully closed state. There is a problem that the opening / closing operation is not performed when the distance is set. SUMMARY OF THE INVENTION [0005] In view of the above,
No. 89591, the endless chain and the lowermost panel body are connected via a connecting rod, and the connecting rod projects and swings indoors as the door curtain moves in the fully open direction. The length of the endless chain corresponds to the fully closed state. However, in this case, since the load of the door curtain is received by the endless chain via the connecting rod, when the connecting rod protrudes and swings,
The endless chain receives the reaction force and is bent outward (toward the front of the opening). To avoid this, the vertical rod is interposed in the endless chain, and the vertical rod is biased to the outdoor in the opening. Because the receiving member is provided, the length of the receiving member may be required, so the number of parts is large and the structure is not allowed to be complicated, and the sliding resistance between the receiving member and the vertical rod is reduced. There is a problem that a light opening / closing operation is impaired by working.
Further, in this device, in the fully closed state, the vertical rod needs to be disposed above the lower sprocket, and as a result, the position of the sprocket is changed to the endless chain and the panel body in the fully closed state. Must be provided at a position lower than the connecting position of the opening, and it is arranged in a concave groove portion opened below the lower end of the opening, and the workability of mounting work and maintenance is deteriorated. There are also problems to be solved by the present invention. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been created with the object of solving these problems, and includes a plurality of panel members constituting a door curtain. In an overhead door configured to open and close the door curtain by movably guiding the guide rollers provided at the left and right ends of the guide rail provided at the skeleton opening, the opening and closing operation of the door curtain is performed by: An endless chain that is connected to the lowermost panel body, and the first upper and lower parts that are supported on the skeleton side and the endless chain is suspended in tension .
With the second sprocket , the upper first sprocket
Forward / reverse drive of a switchgear linked by a power transmission mechanism
In order to perform based on the chain movement of the endless chain based on , the lower second sprocket is
1st sprocket with support for free movement and adjustment
Urges in the direction away from the
Configuring, to the panel body connecting portion of the endless chain to adjust the facing distance between the first sprocket corresponds to displacement in the longitudinal opening direction along with the opening and closing movement of the door curtain construction
And a connecting portion of the endless chain with the lowermost panel.
Via a shock-absorbing ammunition with a lower biasing force than the adjusting ammunition.
An overhead door drive device characterized by being mounted . With this configuration, the tension of the chain caused by the chain connecting portion being displaced in the front-rear direction can be adjusted by changing the facing distance between the sprockets, so that the opening / closing operation can be performed smoothly and the structure can be simplified. Can be measured. FIG. 1 shows an embodiment of the present invention.
The description will be made based on the drawings shown in FIGS. In the drawings, reference numeral 1 denotes a door curtain of an overhead door that opens and closes a skeleton opening of a building.
A plurality of panel bodies 2 are connected in a series by a connecting member such as a hinge, and guide rollers 3 are disposed on both sides of each panel body 2 except for the lowermost panel body 2a so as to protrude outward. ing. On the other hand, reference numeral 4 denotes a guide rail on which the guide roller 3 travels. The guide rail 4 is not vertical but has an indoor side upward so as to ensure smooth opening and closing operation while maintaining airtightness when fully closed. A vertical rail portion 4a disposed on both sides of the opening in a slightly inclined state; a horizontal rail portion 4b disposed along the ceiling surface from the opening toward the indoor side (rear side); The door curtain 1 is constituted by an arc-shaped corner rail portion 4c arranged between the rail portion 4a and the horizontal rail portion 4b, and the door curtain 1 is located on the vertical rail portion 4a to close the opening. The opening and closing of the opening is performed by moving between an open position where the opening is opened by being located on the horizontal rail portion 4b. On the other hand, a take-up shaft 5 is rotatably mounted on the upper part of the frame, and the base end of a wire 6 whose leading end is connected to the lowermost panel body 2a is wound around the take-up shaft 5. It is set so as to take up and unwind, but the take-up shaft 5 is equipped with a balance elastic machine 5a and is always balanced against the weight of the door curtain 1 fed to the vertical rail portion 4a. The door curtain 1 is set to perform opening and closing operations in a state where its own weight is balanced when a driving unit described later is operated. Here, the door curtain 1 is set so that the state in which the edge of the lowermost panel 2a has passed through the vertical rail portion 4a to the corner rail portion 4c is in the fully open position. Reference numeral 7 denotes a connecting bracket integrally attached to a lower corner of one side of the lowermost panel body 2, and a lower portion of the connecting bracket 7 is formed on a roller shaft support 7a. Thus, the shaft portion 3a of the guide roller 3 protruding outward is rotatably supported. Further, the connecting bracket 7 has a pair of support arms 7b, 7c.
Are formed to protrude outward, and a support pin 7d pivotally supported between the arm tip portions of the support arms 7b and 7c is connected to a chain connecting portion 8a of an endlessly formed chain 8 described later. Are connected. Here, the support arms 7b and 7c are bent substantially in a K-shape in plan view so as to protrude from the side of the connecting bracket 7 in a state of detouring rearward, whereby the arm tip 7d is formed. It is set so as to be located outside the guide roller 3. On the other hand, a driving bracket 9 is provided on one side above the opening of the skeleton.
In addition, an opening / closing device 10 in which member devices such as an electric motor and a brake device are provided is disposed, and a shaft portion 11 a of a first sprocket 11 is further rotatably supported on the driving bracket 9. . The first sprocket 11 is connected to a switchgear 10 via a power transmission member (not shown) such as a chain.
The first sprocket 11 is configured to rotate forward and backward with the forward / reverse drive of the switch 10. On the other hand, the second sprocket 12 is rotatably supported on a lower frame 13 provided on the floor below the frame in a state adjacent to the bottom of the groove of the vertical rail portion 4a as described later. The chain 8 is suspended between the sprocket 12 and the first sprocket 11, so that the chain 8 is forcibly moved in accordance with the forward / reverse drive of the opening / closing device 10, whereby the door curtain 1 is opened and closed. The driving means is configured in this manner. The second sprocket 12 has:
When the door curtain 1 is fully opened, the chain connecting portion 8a is displaced toward the corner rail portion 4c and the chain 8 is extended. Correspondingly, the setting is made such that the facing distance between the first and second sprockets 11 and 12 is reduced. In other words, the lower frame 13 includes the left and right sides 13.
a, 13b are formed in a substantially Japanese-character shape in plan view,
Adjustment axis frame 1 having leg sides 14a, 14b opposed to the left and right sides 13a, 13b in the vertical direction, respectively.
4 is fixed, and a pair of adjustment shafts 15 are respectively supported between the leg sides 14a and 14b. The second sprocket 12 is rotatably supported by a cylindrical shaft portion 12a, and the adjusting shaft 15 is movably penetrated through through holes 12b formed at both ends of the shaft portion 12a. Thus, the second sprocket 12 is supported so as to be vertically movable. Further, a coil-shaped adjusting spring 16 biased in the extending direction is fitted on the adjusting shaft 15 between the upper leg side 14a of the adjusting shaft frame and the second sprocket shaft portion 12a so as to be vertically movable. Have been. The tension of the suspended chain 8 is adjusted so as to be slightly received by the adjusting spring 16 with the door curtain 1 in the fully closed position. By the way, in this fully closed state, the chain connecting portion 8
a is located immediately above the second sprocket 12, but FIG.
As shown in (A), the support arms 7b and 7c are connected to the chain 8 by detouring backward and over the leg sides 13a of the lower frame 13.
b, 7c and the lower frame 13 have a positional relationship of being stacked in the front-rear direction. When the opening operation of the door curtain 1 is performed from this state, the chain connecting portion 8a is displaced rearward (inside of the room) from the closed posture position as it is opened, whereby the chain 8 is connected to the chain connecting portion 8a. The chain protrudes rearward and the chain tension increases. Then, the second sprocket 12 receives the increased tension by the urging force of the adjusting elastic machine 16 that reduces the tension, and moves upward, thereby moving the first and second sprockets 11 by a stroke substantially corresponding to the extension. The setting is such that the facing distance between the twelve members is reduced, thereby preventing the chain 8 from becoming abnormally tense and unable to be opened and closed. Reference numeral 13c denotes a groove bottom of the lower frame 13,
Reference numeral 17 denotes a chain guide which is provided integrally with the groove bottom 13c and guides the chain 8 which is not connected to the panel body 2a. By the way, a cutout surface portion 12c is formed at a contact portion of the second sprocket shaft portion 12a with the lower surface of the adjusting bullet 16 so that the shaft portion 12a surely exerts the urging force of the adjusting bullet 16. It is set to be received. The lowermost panel body 2a of the chain 8
The following considerations have been applied to the connecting part. In other words, the chain 8 becomes endless by connecting both ends of the free-end chain. In this case, the upper frame 18 is interposed at one end of the chain 8 and a pair of upper and lower leg sides of the upper frame 18. Through holes 1 in upper leg side 18a of 18a and 18b
8c is movably inserted into the screw shaft 19, and the screw shaft 19
Is connected to one end of the chain 8. A hexagon nut 19a is screwed on the lower end of the screw shaft 19 by a double nut method, and the hexagon nut 19a and the upper leg 1
A coil-shaped shock-absorbing bobbin 20 urged in the extension direction is interposed between the shock-absorbing bobbin 8a and 8a. A mounting hole 18e is formed in the connecting piece 18d extending downward from the lower leg side 18b. On the other hand, a lower frame 21 is connected to the other end of the chain 8, and a mounting hole 21a drilled in the lower frame 21 and the upper frame side mounting hole 18e are formed.
By inserting the support pins 7d of the connection part racket 7 into the chain 8, the chain 8 is connected endlessly, and at the same time, the lowermost panel 2a.
It is linked to and set. In this embodiment, the urging force A of the shock absorbing ammunition 20 is set to be smaller than the urging force B of the adjusting ammunition 16 (A <B). At the start or stop of the operation, a load acting suddenly on the chain 8 is received by the urging force of the buffering ammunition 20, and the buffer is set by extending the chain 8 in a state where the buffering ammunition 20 is reduced. that has been. The tension of the chain 8 can be adjusted by adjusting the tightening position of the hexagon nut 19a. Further, according to this embodiment, the chain tension force, which is increased by the rearward displacement of the chain connecting portion 8a, is reduced by the shock absorber 20 together with the contraction of the adjusting spring 16.
, And thereby, the chain equivalent to the chain extension amount when the chain connecting portion 8a is largely displaced rearward like a rail corner portion,
The upward movement of the second sprocket 12 is assisted by the fact that the chain length of the chain 8 becomes substantially longer as the shock-absorbing ammunition 20 is reduced. It is set so that it can be made smaller than when there is no ammunition 20. The upward displacement of the second sprocket 12 is adjusted by adjusting the length of the adjustment shaft 15 and the adjustment spring 16.
Can be set freely by changing the relationship with the length of the contraction. In the embodiment of the present invention constructed as described above, when the switch 10 is driven to change the door curtain 1 from the closed position to the open position, the lower end of the door curtain 1 is moved to the closed position. From the vertical rail portion 4a to the corner rail portion 4c, the fully open position is reached. At this time, the chain connecting portion 8a of the endless chain 8 moves from the closed position to the position of the corner rail portion 4c. , And the chain 8 is pulled rearward, whereby the tension of the chain 8 is sought to be increased. In this case, the second sprocket 12 is adjusted by the adjusting bullet receiving the increased tension. The first and second sprockets 11, 12
There is no possibility that the distance between the opponents becomes smaller and the chain 8 becomes abnormally tensioned and cannot be opened. Even if the chain length is not lengthened, the chain is maintained in a suitable chain tension state and the opening and closing operation is smooth and light. Can be. As described above, the change in the chain tension caused by the shortage of the chain length caused by the chain connecting portion 8a moving in the front-rear direction in connection with the opening / closing operation is described as follows.
Since the opening and closing operation is performed by absorbing the upward movement against the urging force of the second sprocket 12, the conventional chain and the lowermost panel are connected to each other via a connecting rod. It is not necessary to provide a long receiving member for preventing the connecting rod connecting portion of the chain from moving forward due to the reaction force, so that the number of parts can be reduced, and the receiving member and the connecting portion There is no problem that the light opening / closing operation is impaired due to the sliding resistance. In addition, in the present embodiment, the opposing interval adjusting means can have a simple configuration in which the shaft portion 12a of the second sprocket 12 can be vertically movably supported with the adjusting bullet 16 interposed therebetween. This can contribute to simplification of the structure. Moreover, in this case, the second sprocket 1
2 can be arranged on the floor, so that the mounting work and the maintenance workability do not deteriorate as in the case where a sprocket is provided in a recessed portion of the conventional floor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a rear view of an overhead door. FIG. 2 is a side view of an overhead door. FIG. 3 is a plan view of an overhead door. FIG. 4 is a side view of a main part. FIG. 5 is a rear view of a main part. FIG. 6 is a partial side view of a main part. FIG. 7 is a partial rear view of a main part. 8A is a view taken along the line XX of FIG. 7, and FIG.
(B) is a view on arrow YY of FIG. 7. FIGS. 9A, 9B, and 9C are a plan view, a rear view, and a side view of the connecting bracket, respectively. FIGS. 10A, 10B, and 10C are a plan view, a rear view, and a side view, respectively, of the facing gap adjusting means. FIGS. 11A, 11B, and 11C are a plan view, a rear view, and a side view of the upper frame, respectively. 12A and 12B are a plan view and a side view of a lower frame, respectively. DESCRIPTION OF SYMBOLS 1 Door curtain 2 Panel body 3 Guide roller 4 Guide rail 7 Connecting bracket 7b Support arm 8 Chain 9 Driving bracket 11 First sprocket 12 Second sprocket 13 Lower frame 15 Adjusting shaft 16 Adjusting bullet 20 Shock ammunition

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E06B 9/00 E05F 15/00

Claims (1)

(57) [Claims 1] A door in which guide rollers provided on both left and right end portions of a plurality of panel bodies constituting a door curtain are movably guided by guide rails provided in a frame opening. In an overhead door configured to open and close a curtain, an opening and closing operation of the door curtain is performed by an endless chain connected to a lowermost panel body, and supported by a frame side, and the endless chain is tensioned. Upper and lower first and second sprockets, and power transmission to the upper first sprocket
In order to perform the operation based on the chain movement of the endless chain based on the forward / reverse drive of the switch interlocked and linked via the mechanism , the lower second sprocket is moved up and down
Supported and separated from the first sprocket by the adjustment ammunition
Biasing in the direction of
Te, the panel body connecting portion of the endless chain is in response to displacement in the longitudinal opening direction along with the opening and closing movement of the door curtain
When it is configured to adjust the facing distance with one sprocket
In both cases, at the connecting portion of the endless chain with the lowermost panel,
An overhead-type door drive device comprising a shock-absorbing ammunition having a smaller urging force than an adjusting ammunition .