JPS6323405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a worm band fastener for fastening hose connections.

Prior Art Conventionally, the band is made up of an elastic band having a threaded groove at one end, a housing fixed to the opposite end of the band, and a worm screw inserted into the housing and rotatably locked, and the threaded groove is provided with a threaded groove. In the worm band tightening tool for tightening the hose with a ring formed by inserting the end of the band on the side provided with the housing from the front opening of the housing and meshing with the worm screw, the structure for fixing the band and the housing is The following methods have been used, but all of them have drawbacks that pose a practical problem. For example, in FIG.
It has a structure in which ears 3 are provided on the lower surface 2a of the saddle portion 2, the ears 3 are bent symmetrically in the width direction of the band 4, and the ears 3 are fitted and locked into the ear holes 5 of the band 4. However, this structure is not easy to assemble, and it is difficult to ensure stable quality. Furthermore, when the worm screw 6 is tightened, the rigidity of the housing 1 is insufficient, and the bent portion of the saddle portion 2 holding the band 4 may open, or the lower surface portion 2a may be lifted up from the band 4. , the ears 3 may be pulled out, torn, or twisted, resulting in incomplete engagement between the threads of the worm screw 6 and the thread grooves of the band 4, resulting in a reduction in tightening force or the inability to tighten. Ta. Alternatively, if the ears 3 are made larger to withstand high tightening force, the width and plate thickness of the housing 1 and the band 4 will become too large, and conversely, if the ears 3 are thin and narrow, the ears 3 will be affected by heat treatment. There were cracks and breakage.

In FIG. 2, the lower surface 12a of the saddle portion 12 of the housing 11 is provided with a trapezoidal (as shown), circular, etc. protruding piece 13 and a notch 14 that fits into the protruding piece 13. In this case as well, due to the lack of rigidity of the housing 11, a reduction in the tightening force, an inability to tighten, etc., similar to the structure shown in FIG. 1, occurred.

In FIG. 3, the lower surfaces 22a of the saddle portions 22 of the housing 21 are bent toward the band center line, and their tips are brought into contact with each other.
It has a structure in which one end of the saddle part 22 is inserted into the saddle part 22 and fixed by spot welding. In this case, the first
In addition to the drawbacks of the structure shown in FIG. 2 and FIG. 2, there was also the problem that the housing 21 could shift or come off in the longitudinal direction of the band 23 due to poor welding.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a worm band fastener that eliminates the above-mentioned drawbacks, has a worm screw housing that is simple in structure, has high rigidity, and exhibits high tightening force.

Composition of the Invention In order to achieve the above object, a band tightening tool of the first invention has a housing formed by integral drawing processing from a metal pipe, a semi-cylindrical part that accommodates a worm screw, and a saddle that is inserted through a band end part. The surface of the saddle part that contacts the hose is formed in an arc shape that matches the circumference of the hose, and the end of the band to which the housing is fixed has a bottom surface of the saddle part. It is characterized by the provision of protrusions that lock the front and rear ends of the sides. With such a configuration, a worm band fastener having a simple structure and a housing having high rigidity can be obtained.

Further, the second invention provides a housing having a tapered semi-cylindrical portion instead of the semi-cylindrical portion and a tapered worm screw corresponding thereto, thereby achieving a smoother tightening effect of the worm screw. A worm band fastener having the following properties is obtained.

Embodiments The present invention will be described below based on drawings showing embodiments. In Figures 4 to 10, 31
is a narrow band having elasticity, and thread grooves 32 of equal pitch are punched out from the thickness of the band 31 from one end 31a. At the opposite end 31b of the band 31, as shown in FIG.
Two protrusions 33 and 34 protruding from the lower surface of 1 are provided at opposing positions separated by a constant distance. The protrusions 33 and 34 are formed by pressing, bending, drawing, etc. along the notches in the width direction of the band 31. An elongated hole 35 is provided in the longitudinal direction of the band 31 between the protrusions 33 and 34. Furthermore, holes 36a and 36b whose areas gradually decrease compared to the thread grooves 32 are provided following the final groove 32a of the thread grooves 32 that are lined up sequentially from the tip 31a of the band 31. Reference numeral 41 denotes a housing, which is held between both protrusions 33 and 34 provided at the end 31b of the band 31. A worm screw 51 is inserted into the housing 41. The housing 41 is formed by integral drawing from a metal pipe, and has a seamless cross section consisting of a semi-cylindrical part 42 that accommodates the worm screw 51 and a saddle part 43 that is inserted into the band end part 31b. The surface of the portion 43 that comes into contact with the hose is formed into an arc shape that matches the circumference of the hose. The front and rear edges of the lower surface portion 43a of the saddle portion 43 are provided with corner portions 43b that engage with the projections 33 and 34 of the band 31. The front end portion 42a of the semi-cylindrical portion 42 is provided with a semicircular guide hole 44a with a cutout at the bottom, which serves as a guide portion for supporting the tip 51a of the worm screw 51 and rotatably maintains the diameter of the tip 51a. An end wall 44 is provided having a.

The worm screw 51 has a shaft portion 52 extending rearward from a tip 51a, and is provided with a thread 53.
A shoulder portion 5 having a larger diameter than the shaft portion 52 is provided at the rear end of the shaft portion 52.
4 is provided, and comes into contact with the rear end surface of the housing 41 when the worm screw 51 is inserted. Shoulder part 5
A hexagonal screw head 56 is provided behind the rear flange 55 of 4. The worm screw tip 51a is caulked 57 to increase the diameter of the portion protruding from the guide hole 44a, and when the worm band fastener is in a stand-alone state, the housing 4
It is also possible to make it difficult for the worm screw 51 to come off.

When using the worm band tightening tool configured as described above, the saddle portion 43 of the housing 41 is inserted into the tip 31b of the band 31, and the corner portion 43b of the front and rear edges of the lower surface portion 43a is inserted into the protrusion of the band 31. It is fitted and locked between the parts 33 and 34. Next, insert the worm screw 51 into the semi-cylindrical part 42 of the housing 41, and insert the tip 51a into the semi-cylindrical part 42.
into the guide hole 44a. The guide hole 44a allows the worm screw 51 to be positioned and rotated smoothly. Next, wrap the band 31 around a target part such as a hose, and attach the end 31a to the housing 41.
The hexagonal screw head 5b of the worm screw 51 is rotated in the tightening direction. Then, the thread 53 and the thread groove 32 engage with each other, and as the worm screw 51 rotates, the band 31 is wound around and the hose etc. are tightened. In this process, the worm screw 51 is applied with torque using a hexagonal wrench or the like, and the engagement between the thread 53 and the thread groove 32 attracts the band end 31a.

Due to the reaction force against this tightening, the protrusion 33 of the band end 31b is pushed against the lower front end 4 of the saddle part 43.
3b, and the rear end surface of the semi-cylindrical portion 42 presses the shoulder portion 54 of the worm screw 51. Therefore, the housing 41 is pressed against the rear end surface of the semi-cylindrical part 42 by the shoulder part 54 of the worm screw 51, and the saddle part 43 is pushed by the reaction force from the projection part 33 of the band end part 31b.
The corner 43b of the lower front edge of is pressed. Further, reaction forces from the band 31 and the worm screw 51 are applied to the side wall of the semi-cylindrical portion 42 and the side and lower surface portions 43a of the saddle portion 43, and torsional stress is generated each time a torque is applied. However, the housing 41 is integrally formed as a whole and has sufficient rigidity, so that the tightening force of the band 31 does not deform due to the above-mentioned forces, and the screws do not disengage or separate. fully demonstrate. Thread groove 3
The top of the thread 53 that is engaged with the band 2 protrudes from the plate thickness of the band 31 and is received in the elongated hole 35 of the band end 31b, so that the screw engagement is more complete. In addition, holes 36a and 36b whose area gradually decreases are provided following the final thread groove 32a to prevent stress concentration, so when the band 31 is bent into a ring shape along the outer circumference of a hose etc., the final thread groove 32a
The problem of breaking at cross section 2a has been resolved. Furthermore, when the tip 51a of the worm screw 51 is caulked 57, the worm screw 51 does not separate from the housing 41 even when the fastener is not used, making it convenient to handle.

11 and 12 are a side view and a longitudinal sectional view of a worm band fastener according to a second invention. The second invention is that the housing 61 and the worm screw 71 are formed into a tapered shape.
It is different from the invention of Components that are the same as those in the first invention are given the same numbers and their explanations will be omitted. The housing 61 is formed by integral drawing from a metal pipe, and has a seamless cross section consisting of a tapered semi-cylindrical portion 62 that accommodates the worm screw 71 and a saddle portion 63 that is inserted into the band end portion 31b. The surface of the saddle portion 63 that comes into contact with the hose is formed into an arc shape that matches the circumference of the hose, and is held between the protrusions 33 and 34 of the band end portion 31b. The front and rear edges of the lower surface portion 63a of the saddle portion 63 are formed by the protruding portion 3.
3 and 34 are provided. The front end 62a of the tapered semi-cylindrical portion 62 has a semicircular guide hole 64a with a cutout at the bottom, which rotatably holds the diameter of the tip 71a of the worm screw 71.
An end wall 64 is provided having a diameter.

The tapered worm screw 71 has a tapered shaft portion 72 extending behind a tip 71a and a thread 73.
is provided. At the rear end of the shaft portion 72, the shaft portion 7
A shoulder portion 74 having a diameter larger than 2 is provided, and comes into contact with the rear end surface of the housing 61 when the worm screw 71 is inserted. A hexagonal screw head 76 is provided behind the shoulder 74 via a flange 75 at the rear thereof. The worm screw tip 71a may be caulked 77 as in the first invention.

The worm band fastener according to the second invention configured as described above has substantially the same effects as the first invention, and also has a smoother worm screw tightening effect. That is, due to the forwardly inclined inner surface shapes of the tapered semi-cylindrical portion 62 and the saddle portion 63 as shown in FIG. 12, when the worm screw 71 is turned in the tightening direction, the worm screw 71 is simultaneously pulled forward. A pressing action is exerted on the tapered semi-cylindrical portion 62 and the band end portion 31b. Therefore, the worm screw 71
The threaded thread 73 is connected to the inner circumferential surface of the tapered semi-cylindrical portion 62 and the threaded groove 32 of the band end portion 31b.
Always keep the worm screw 71 in a close engagement state.
The tightening action is performed smoothly.

Effects of the Invention As explained above, the present invention provides a worm band fastener in which the housing of the worm screw is formed by integral drawing from a metal pipe,
It has a seamless cross section consisting of a semi-cylindrical part that accommodates the worm screw and a saddle part that is inserted into the end of the band, and the surface of the saddle part that contacts the hose is formed into an arc shape that matches the circumference of the hose. Since it is fixed by a protrusion provided at the end of the band, it is possible to obtain a housing having a simple structure and high rigidity and precision, and its fixing structure, which has the effect of being able to exert a high tightening force.

Further, the second invention provides a housing having a semi-tapered cylindrical part instead of the semi-cylindrical part, and a corresponding tapered worm screw, so that it has the same effect as the first invention. This also has the effect of smoothing the tightening action of the worm screw.

[Brief explanation of the drawing]

1 to 3 are perspective views showing a structure for fixing a band and a housing of a conventional worm band fastener, FIG. 4 is a perspective view similar to the above of an embodiment of the present invention, and FIG. A front view of the embodiment of this invention, FIG. 6 is a side view of the same, and FIG.
Figure 8 is an enlarged vertical cross-sectional view of the main part of Figure 5 with the tip of the worm screw caulked, Figure 9 is a cross-sectional view taken along the line - - of Figure 8, Figure 10 is one end of the band. FIG. 11 is a front view of the second embodiment of the invention, and FIG. 12 is a longitudinal sectional view of the main part of FIG. 11. 31...Band, 33, 34...Protrusion, 35
...Elongated hole, 36a, 36b...Hole, 41, 61...
...Housing, 42...Semi-cylindrical part, 43, 63...
... Saddle part, 51, 71 ... Worm screw, 62
...Tapered semi-cylindrical part.

Claims (1)

[Scope of Claims] 1. A band having elasticity and having a threaded groove on one end, a housing fixed to the opposite end of the band, and a worm screw inserted into the housing and rotatably locked. A worm band tightening tool for inserting the end of the band on the side where the thread groove is provided through the front opening of the housing and tightening the hose by a ring formed by engaging with the worm screw, The housing is formed by integral drawing from a metal pipe, and has a seamless cross section consisting of a semi-cylindrical part that accommodates the worm screw and a saddle part that is inserted into the end of the band, and has a seamless cross section that is connected to the hose of the saddle part. A worm band characterized in that a contacting surface is formed in an arc shape that matches the circumference of the hose, and a protrusion that locks the front and rear ends of the lower surface of the saddle part is provided at the end of the band to which the housing is fixed. Fasteners. 2. The worm band tightening tool according to claim 1, wherein a guide portion for supporting the tip of the worm screw is provided at the front end of the housing. 3. The worm band tightening tool according to claim 2, wherein the tip of the worm screw protruding from the guide portion is caulked. 4. The band according to any one of claims 1 to 3, characterized in that an elongated hole is provided between the protrusions of the band in a longitudinal direction to avoid interference with the worm screw. Worm band fastener. 5. According to any one of claims 1 to 4, the band is provided with several holes whose area gradually decreases after the final groove of the thread grooves lined up sequentially from the tip. worm band fastener. 6 Consisting of an elastic band with a threaded groove at one end, a housing fixed to the opposite end of the band, and a worm screw inserted into the housing and rotatably locked, the threaded groove is A worm band tightening tool that tightens a hose with a ring formed by inserting the provided end of the band from the front opening of the housing and meshing with the worm screw, wherein the worm screw has a tapered shape. The housing is formed by integral drawing from a metal pipe, and has a seamless cross section consisting of a tapered semi-cylindrical part that accommodates the worm screw and a saddle part that is inserted into the band end part, The surface of the saddle portion that comes into contact with the hose is formed in an arc shape that matches the circumference of the hose, and the end portion of the band to which the housing is fixed is provided with a protrusion that locks the front and rear ends of the lower surface of the saddle portion. Features a worm band tightening tool. 7. The worm band tightening tool according to claim 6, wherein a guide portion for supporting the tip of the worm screw is provided at the front end of the housing. 8. The worm band tightening tool according to claim 7, wherein the tip of the worm screw protruding from the guide portion is caulked. 9. The band according to any one of claims 6 to 8, characterized in that an elongated hole is provided between the protrusions of the band in a longitudinal direction to avoid interference with the worm screw. Worm band fastener. 10. According to any one of claims 6 to 9, the band is provided with several holes whose area gradually decreases after the final groove of the thread grooves lined up sequentially from the tip. worm band fastener.