JPS6321798Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a device for adjusting the tension of a driving belt of an automatic door installed at the entrance of a building or a room inside the building.

(Prior Art) Conventionally known devices for adjusting the tension of the driving belt of automatic doors usually include an adjusting screw installed between the driving pulley and the driven pulley in parallel with the blind. In many cases, the tension of the belt was adjusted by rotating the driven pulley with a tool such as the following tool to move the driven pulley in the direction of the belt. Also, for example, JP-A-57-
There is also known an invention disclosed in Japanese Patent Publication No. 2168, in which an adjustment screw is arranged perpendicularly to the blind and a cam is used to move the driven pulley in the direction of the belt.

(Problem to be solved by the invention) Of course, in the former among the above conventional devices, it is necessary to put your hand between the belts and turn the screwdriver sideways in a narrow space, which makes it difficult to use your hands. It was difficult to operate the adjustment screw because the screw would hit the inner wall without a hole, and it took a lot of effort to adjust it. In addition, in the latter case, the adjustment screw is placed perpendicular to the blind eye, so the advantage is that you can operate the adjusting screw comfortably without having to hit the belt or the blind eye with your hands or tools like in the former case. However, on the other hand, it has a slope for thrust conversion to move the sliding base relative to the block base by converting the longitudinal movement of the adjustment screw into a parallel horizontal movement at a 90 degree angle. Special parts such as formed wedges, rotating rollers, guide pins, etc. to facilitate direction change and movement, connecting screws are attached separately to adjustment springs, and many parts such as adjustment sleeves are required. Since the block base is used, the structure is complicated and it takes a lot of time to manufacture the parts and assemble the device.In addition, when making adjustments, you must first hold the block base in a tensioned state by placing your hand on the tension fitting on the left end of the block base. However, there are many problems in that it is complicated to operate the adjustment screw after temporarily tightening the block base fixing bolt.

In order to solve the above-mentioned problems, the present invention incorporates an adjusting spring into the adjusting screw, and also installs a device such as a husband on the opposite side of the driven pulley to the driving pulley, thereby allowing the adjusting screw to be operated. To provide a tension adjustment device for a driving belt of an automatic door which is extremely easy to adjust, has an extremely simple mechanism, has few parts, is inexpensive, and has excellent durability. aim at something.

(Structure of the invention, means for solving problems) The structure of the invention will be described below by way of embodiments with reference to the drawings. Figure 3 shows the belt tension adjustment device of the present invention and a part of the upper part of the automatic door in which it is installed. In Figure 3, 1 is the door body of the automatic door, which is made of aluminum alloy. It is formed from aluminum sash fittings assembled by combining extruded materials. 2
3 is the door wheel that runs this door body 1, and 3 is the door body 1.
4 is a guide rail on which the door roller 2 slides, and is covered with a thin plate of aluminum alloy sash material or other metal material provided on the upper part of the door body 1. It is installed parallel to the inner lower edge of a blind 5 having the strength to withstand the weight of the door body 1 inside. 6 is a driven pulley fixed part fixed to the inside of the blind 5, 7 is a driving pulley fixed part, 8 is a driven pulley, 9 is a driving pulley, and 10 is between the driven pulley 8 and the driving pulley 9. Belt for driving the stretched door body 1, 1
Reference numeral 1 denotes a connecting plate that connects the belt 10 and the upper part of the door body 1 in order to drive and run the door body 1. In the case shown, it is fixed to a part of the shaft support fixture 3 of the door wheel 2, but the connecting plate 1 The connecting portion between the plate 11 and the door body 1 is not limited to the above, and it goes without saying that one end of the connecting plate 11 may be directly fixed to the upper edge of the door body 1, for example. For convenience when removing the main body 1, the connecting plate 11 and the pivot fixing fitting 3 or the upper edge of the door main body 1 are fixed by bolt-nut joints or bolts with sufficient holding strength to avoid semi-permanent fixation such as welding. It is preferable to rely on removable fastening means by screwing. 12 is a drive motor for rotating the drive pulley 9, and A is a tension adjustment device for the drive belt of the automatic door, which forms the main part of the present invention. Next, FIGS. 1 and 2 are a plan view and a partially sectional side view of the tension adjusting device A, and in both figures, 13 is a driven pulley that is firmly attached to the inside of the mesh 5. A base plate 14 for fixing the fixing part 7 is a driven pulley fixing part 7 made by bending a thin plate of metal material such as an iron plate into a protruding shape that is U-shaped in cross section and long in the longitudinal direction of the blind 5.
It is firmly fixed to the substrate 13 with a fixed base forming an underframe. Reference numeral 15 denotes an end portion of the driven pulley 8 of the fixed base 14 on the opposite side from the driving pulley 9, which is folded or fixed at right angles to the upper surface 16 of the fixed base 14, either integrally with the fixed base or by means of fixing such as welding. With the standing board on the side of the fixed base,
A female threaded hole 17 into which an adjustment bolt 27 (described later) is screwed is bored in the center. Reference numeral 18 denotes a slide base with a shallow U-shaped cross section that straddles the horizontal upper surface of the fixed base 14 and is slidably movable on the horizontal upper surface 16 in the longitudinal direction of the mesh 5. It is made by bending a thin plate of metal material such as iron plate. 1
Reference numeral 9 denotes the fixed base side standing plate 15 provided at one end of the slide base 14 opposite to the fixed base side standing plate 15.
The vertical plate on the side of the slide base is provided by the above method, and a circular through hole 20 is bored in the center thereof into which an adjustment bolt 27, which will be described later, is inserted. Reference numeral 21 indicates an appropriate number of elongated holes drilled in the upper surface 22 of the slide base 14 in the longitudinal direction of the blind 5, and reference numeral 23 indicates a female screw hole 31 drilled in the fixed base 14, which will be described later. A fixing screw 24 is a slide for firmly fastening the base 18 at an appropriate fixing position adjusted by moving relative to the fixed base 14 within the range of the longitudinal hole size of the hole 5 of the elongated hole 21. The driven pulley 8 is supported by a shaft support bolt that is installed in a through hole or a female threaded hole drilled in the base 18, and the bearing part 25 of the driven pulley 8 is fitted in the male threaded part thereof, and a nut 26 is screwed thereon. Reference numeral 27 denotes an adjustment bolt screwed into the female threaded hole 17 of the fixed base side vertical plate 15 from the side opposite to the driving pulley 9 with respect to the driven pulley 8 and inserted into the through hole 20 of the slide base side vertical plate 19;
a is its head, 28 is the slide base side standing plate 19
A compression spring is inserted into the male threaded portion 29 of the adjustment bolt 27 that protrudes from the circular through hole 20 toward the driven pulley 8, and is held so that it does not fall off from the adjustment bolt 17 by a spring mounting device 30 consisting of a double nut or the like. do. Therefore, the head 27a of the adjustment bolt 27
Due to the rotation of , the spring mounting tool 30 consisting of a double nut or the like rotates together with the compression spring 28 , and the male threaded portion 2
In cases where there is a risk of the screw falling off from the end of the male screw portion, a split pin or an annular thin plate spring fastener, etc., is attached to the end of the male threaded portion as a spring mounting tool 30 to prevent the compression spring 28 and/or double nut from falling off. There are some things. The fixed base side vertical plate 15 and the slide base side vertical plate 19 are both made thicker by stacking and welding angular thin plates for reinforcement to provide strength corresponding to the spring force of the compression spring 28. A separate male screw hole block may also be provided. Also, the second
In the figure, reference numeral 31 indicates a female threaded hole for screwing the slide base 18 into the fixed base 14 with a fixing screw 23, which is bored in the upper surface 16 of the fixed base 14;
is a long hole for moving the shaft support bolt 24 of the driven pulley 8.

Among the embodiments of the present invention consisting of the above-mentioned partial configurations, an essential component of the present invention is that the fixed base side stand is provided with a female threaded hole 17 at the end opposite to the installed position of the drive pulley 9 relative to the driven pulley 8. A female screw hole 31 into which the plate 15 is erected and the fixing screw 23 is screwed into the upper surface 16
A U-shaped fixed base 14 formed by bending a thin plate of metal material long in the longitudinal direction of the blind 5 provided with the
A slide base side standing plate 19 is mounted over the fixed base 14 and is slidably movable in the longitudinal direction thereof, and has a through hole 20 formed at one end parallel to the fixed base side standing plate 15. A plurality of long holes 2 are provided on the upper surface 22.
1, a slide base 18 having a shallow U-shaped cross section formed by bending a thin plate of metal material long in the longitudinal direction of the blind 5, and the fixed base side. The vertical plate 19 on the slide base side is screwed into the female screw hole 17 of the vertical plate 15.
an adjustment bolt 27 inserted into a circular through hole 20;
The compression spring 28 is fitted into the male threaded portion 29 of the adjustment bolt 27 protruding from the slide base side standing plate 19 and held by a spring mounting device 30 such as a double nut attached to the end of the male threaded portion 29, the driven pulley 8 and the drive. It consists of a belt 10 stretched around a pulley 9, and balances the tension of the belt 10 with the elastic force of a compression spring 28 that compresses the slide base 18 within the range of its elongated hole 21 by rotation of an adjustment bolt 27. The belt 10 is slidably moved on the fixed base 14 to a balanced position, and at the balanced position, the slide base 18 is fastened to the fixed base 14 through the long hole 21 with the fixing screw 23. The feature is that the tension can be adjusted appropriately.

(Function) Since the embodiment of the present invention is made up of the above-mentioned partial structure, when adjusting the tension of the belt, first loosen the fixing screw 23 and place it in place, while leaving the compression spring 28 in the open state, that is, the free length. Let's keep it there. Next, attach the fixed base side vertical plate 1 to the head 27a of the adjustment bolt 27.
When the head 27a is rotated counterclockwise using a socket trench, screwdriver, spanner, etc. from the outside of 5, the adjustment bolt 27 is screwed into the female screw hole 17 of the fixed base side standing plate 15. , while gradually rotating in the direction of the left arrow with respect to this female threaded hole 17, it moves backward in the axial direction, but as it moves backward, the male threaded portion 2 of the adjustment bolt 27
9, the left end is supported by the slide base side vertical plate 19, and the compression spring 28 is fixed at the right end of the male screw portion 29 by a spring mounting tool 30 such as a double nut for mounting the spring. This movement moves to the slide base side vertical plate 19.
is transmitted to the slide base 18 via the compression spring, and the slide base 18 is slid on the fixed base 14 that straddles the elongated hole 21 until the elastic force of the compression spring and the tension of the belt 10 are balanced. move the target.
Therefore, after rotating the adjustment bolt 27 until the belt 10 is maintained at an appropriate tension state, tighten the fixing screw 23 to firmly fasten the slide base 19 to the fixed base 14. When the door is operated, the tension of the belt 10 will not change due to slippage. However, depending on long-term use, the belt
If the belt itself stretches but there is no problem with cutting or the like, the adjustment bolt 27 may be rotated counterclockwise again to restore the proper tension state of the belt 10.

(Effects of the invention) The present invention has the above-mentioned structure and operation, but in particular, in this invention, the adjustment bolt for adjusting the tension of the belt is not used in the narrow space between the belts, so it is difficult to use an adjusting tool such as a screwdriver or the like. The drive pulley 8 is located on the opposite side of the driven pulley 8 from the driving pulley 9 on the outside, and its head 27a is located outside the standing plate on the fixed base side. The adjustment bolt 27 is extremely easy to operate, and the length allows for easy adjustment at any time using a tool such as a spanner or screwdriver, and the structure itself is compatible with the fixed base side and the sliding base side.
Then, a U-shaped slide with a shallow U-shaped cross section made of the same material and bending means is attached to the U-shaped fixed base 14, which has a small number of parts such as an adjustment bolt 27 and a compression spring 28, and is formed by bending a thin metal plate. Since it is composed of relatively simple elements with a structure spanning the base 18, it does not require a large number of complicated parts such as special cams and rollers combined with husbands in the places where force is applied. Compared to the above, it has superior effects in that it operates more reliably, has less risk of damage, and can significantly reduce production costs.

[Brief explanation of drawings]

Figure 1 is a plan view of the main parts of the present invention, Figure 2 is a side view with only a portion shown in cross section, and Figure 3 is a front view of the main parts of an automatic door equipped with the adjustment device of the present invention. , 4th
The figure is a front view of the main part of the fixed base side standing board, and FIG. 5 is the front view of the main part of the sliding base side standing board. Explanation of the symbols representing the main parts of the diagram: 1... Door body, 2... Door roller, 3... Pivot support fixing fitting (of door roller 2), 4... Guide rail, 5... No eyes, A...
Belt tension adjustment device, 6... Driven pulley fixed part, 8... Driven pulley, 9... Drive pulley,
10...Belt, 11...Connection plate, 13...Substrate, 14...Fixed base, 15...Fixed base side vertical plate, 16...Top surface (of fixed base 14), 17
...Female screw hole of the fixed base side standing plate 15, 18...
...Slide base, 19...Slide base side vertical plate, 20...Through hole (of slide base side vertical plate 19), 21...Long hole (of slide base 19), 2
2...Top surface, 23...Fixing screw, 27
... Adjustment bolt, 21a ... Head, 28 ... Compression spring, 29 ... Male threaded part, 30 ... Spring mounting tool (such as a double nut).

Claims (1)

[Scope of utility model registration request] A fixed base side standing plate 15 with a female threaded hole 17 is provided at the end opposite to the installed position of the driving pulley 9 with respect to the driven pulley 8, and a fixing screw 2 is attached to the upper surface 16.
A U-shaped fixed base 14 formed by bending a thin plate of metal material long in the longitudinal direction of the open end 5 having a female threaded hole 31 for screwing the fixed base 14, A slide base side standing plate 19 is vertically movable in the sliding direction and has a through hole 20 bored at one end parallel to the fixed base side standing plate 15, and has a plurality of elongated holes 21 on the upper surface 22. A fixed base 14 on which the driven pulley 8 is mounted, a slide base 18 having a shallow U-shaped cross section formed by bending a thin metal plate long in the longitudinal direction of the blind 5, and the fixed base side standing plate 15. its head 27a on the outside of
and attach the male threaded part 29 to the fixed base side standing plate 1.
An adjustment bolt 27 screwed into the female screw hole 17 of No. 5 and inserted into the circular through hole 20 of the slide base side standing plate 19.
and the male threaded portion 29 of the adjustment bolt 27 protruding from the slide base side vertical plate 19.
It consists of a compression spring 28 held by a spring mounting device 30 attached to the end of the slide base 18, and a belt 10 wrapped around a driven pulley 8 and a drive pulley 9. bolt 2
The slide base 18 is slidably moved on the fixed base 14 to a balanced position where the elastic force of the compression spring 28 compressed by the rotation of the belt 7 and the tension of the belt 10 is balanced. Long hole 2 in fixed base 14
1. A tension adjustment device for a driving belt of an automatic door, characterized in that the tension of a belt 10 is properly adjusted by tightening with a fixing screw 23 through a belt 10.