JPS6210061Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a belt tightening device used to tighten a belt between an article and a fixed structure to prevent the article from moving, or to tighten a belt wrapped around an article. The object of the present invention is to provide a belt tightening tool that can be tightened and released with a simple operation, and that does not cause the belt to loosen or become unfastened in the tightened state. .

The present invention will be described below with reference to the drawings. Figs. 1 and 2 are a central vertical sectional view and a plan view of the belt fastener of the present invention in use. The belt fastener 1 of the present invention consists of a fastener main body 2 and an operating lever 3, and a hook 4 is rotatably attached to the rear end of the fastener main body 2. The free end of the belt 5, which has a hook (not shown) attached to one end, is passed through the belt fastener 1 and tightened.

The fastener main body 2 consists of a pair of side plates 6 that are provided facing each other and a bridging plate 7 installed between the lower front ends of the side plates 6, and a support plate 8 extending forward from the upper end of the bridging plate 7. Flanges 9 are bent and raised on both sides of the front end of the support plate 8, and a guide bar 10 is installed between the flanges 9. Further, a substantially inverted guide hole 11 is bored in the center of the side plate 6. Further, the rear ends of the side plates 6 are bent in a direction toward each other, and a hook 4 is rotatably supported at the rear end by a pin 12.

On the other hand, the operating lever 3 is made up of a cover plate 13 and side plates 14 provided opposite to each other on both side edges of the cover plate 13.
The rear part of 4 is formed wide and constitutes a base 15,
The base 15 is provided with a first shaft 16 and a second shaft 17. The first shaft 16 has both ends passing through the side plate 14, and the tip thereof is connected to the guide hole 11 of the fastener main body 2.
a shaft 18 slidably fitted along the
The second shaft 17 has a knurled surface and is fixedly supported by the side plate 14 at both ends.

The peripheral edge of the base 15 of the operating lever 3 from the rear lower part to the front lower part constitutes a cam edge 20.
A first circular arc 21 whose center is approximately at the first shaft 16 is formed at the rear part of the cam edge 20, and a second circular arc 22 whose center is approximately at the second shaft 17 at the front part.
is formed, and the first circular arc 21 and second circular arc 22 are connected by a smooth curved portion 23.

To use the belt tightening device of the present invention, first, the operating lever 3 is rotated backward as shown in FIG. In this state, the first shaft 16 is connected to the guide hole 1
1, and the second shaft 17 is located at the rear end of the first shaft 1.
The belt portion 5b located at the front upper part of the belt 6 and extending from the support plate 8 to the first shaft 16 extends in a straight line, and after being wound around the first shaft 16, the belt portion 5b reaches the support plate 8 again. The portion 5d also slightly contacts the second axis and is substantially straight. Therefore, the belt 5 can be freely moved in any direction, and the length of the belt can be adjusted. Also, at this time, the operating lever 3
The first arc 21 of the cam edge 20 at the base 15 of
The rear end portion of the fastener body 2 is in contact with the bridging plate 7 of the fastener main body 2. In this state, for example, a hook (not shown) attached to the end of the belt 5 is hooked onto a fixed structure, the hook 4 is hooked onto the article to be tightened, and the free end 5e of the belt is pulled, thereby tightening the belt portion 5a. Make me nervous.

Next, when the operating lever 3 is operated and rotated clockwise, the first shaft 16 is supported by coming into contact with the inside of the curve at the rear of the guide hole 11, and the first circular arc 21
slides in contact with the bridging plate 7, so that the operating lever 3 as a whole rotates about the first shaft 16, and the second shaft 17 pushes down the belt portion 5d and presses it against the belt portion 5b. , further pushing down the belt portion 5b. In this state, the operating portion of the operating lever 3 extends substantially upward, as shown in FIG.

When the operating lever 3 is further rotated, the curved portion 23 slides in contact with the bridging plate 7 following the first circular arc 21, and the first shaft 16 is rotated using this contact point as a fulcrum as shown in FIG. It moves forward and downward along the guide hole 11. Moreover, the second shaft 17 is further pushed down, and the belt portion 5a is strongly tightened. In addition, in this process, the belt 5
is tightened most strongly, but bridging plate 7
The position of the curved portion 23 that contacts the first shaft 16 approaches the first shaft 16, and the operating lever 3 is rotated using this contact point as a fulcrum, so the leverage ratio increases and the force required to rotate the operating lever 3 increases. is small. Furthermore, the direction of the force applied to the operating lever 3 is substantially forward and substantially coincides with the direction in which the belt 5 extends. Therefore, no unnecessary force is applied in the vertical direction of the fastener, and the belt 5 can be operated while being stretched straight, without causing any slack.

When the operating lever 3 is further rotated, the second circular arc 22 moves so as to roll while coming into contact with the bridging plate 7. The first shaft 16 then moves forward along the front half of the guide hole 11, and as shown in FIG. 6, the tightening is completed. In this last process, if the shape of the guide hole 11 is set so that the belt is slightly loosened at the end of the rotation of the operating lever 3, the load applied to the belt 5 will move the operating lever 3 clockwise in the figure, that is, in the tightening direction. Therefore, there is no risk of the tightening being inadvertently released.

Therefore, in the present invention, the operation of tightening and releasing the belt is extremely easy, the workability is good, and the belt is not untightened inadvertently, making it extremely convenient.

In addition, as a belt fastener having a structure similar to the present invention, the applicant previously applied for patent application No. 102,638/1983.
No. (Japanese Unexamined Patent Publication No. 57-27673). However, in this case, the guide hole is an elongated hole that is substantially straight from front to back, and the cam edge consists only of the first circular arc and the second circular arc, and has no curved portion. Therefore, when tightening the belt, the force of rotating the control lever is directed upward and downward against the belt tension line, causing the belt to shake and making it difficult to turn the control lever. It becomes loose and cannot be tightened tightly.

The present invention overcomes these drawbacks and is extremely easy to operate.

[Brief explanation of the drawing]

The drawings show an embodiment of the belt tightening device of the present invention, in which Fig. 1 is a central vertical sectional view, Fig. 2 is a plan view, and Figs. 3 to 6 show the process of rotation of the operating lever. FIG. 1... Belt fastener, 2... Fastener body, 3... Operation lever, 4... Hook, 5... Belt, 6...
side plate of the fastener main body, 7... bridge plate, 8... support plate,
11...Guide hole, 14...Side plate of operation lever,
15... Base, 16... First shaft, 17... Second shaft, 18... Shaft, 19... Sleeve, 20
...Cam edge, 21...First circular arc, 22...Second circular arc, 23...Curved portion.

Claims (1)

[Scope of utility model registration request] It has a pair of side plates facing each other, a substantially inverted-shaped guide hole is bored in the side plates, and a bridging plate installed between the side plates is provided at the lower front end of the side plates. A support plate is formed that extends forward from the upper end of the bridging plate, and has a fastener main body with a hook attached to the rear end, and a pair of side plates facing each other, and the base of the side plate has a support plate extending forward through the side plate. A first shaft having both ends slidably fitted into the guide hole of the main body, and a sleeve rotatably fitted to the shaft, and both ends below or rearward of the first shaft. a second shaft fixedly supported on the side plate; a first circular arc approximately centered on the first axis is formed at the rear lower edge of the base of the side plate; A second circular arc is formed approximately centered on the second axis, and the first circular arc and the second circular arc are connected by a smooth curve to form an operating lever that forms a cam edge, and a hook is attached to one end. A belt in which the free end of the belt is inserted from the front end of the main body, passed under the second shaft, wound around the first shaft, further passed between the belt and the second shaft, and pulled out from the front end of the main body. Fasteners.