JPS61241508A - Worm gear type hose clamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to engine room cooling and intake air in automobiles.
Hose clamps are used to connect hoses used in various systems such as fuel supply, lubricant circulation, power steering, air conditioning equipment, general water supply hoses, gas hoses, and chemical injection hoses to metal pipes, and are especially applicable to worm gears. This invention relates to a worm gear type hose clamp that is used to tighten and loosen a band.

<Prior Art> FIG. 8 is a perspective view of a conventional example of a worm gear type hose clamp used in the above-mentioned equipment. This hose clamp includes an inner band 1 that is wrapped around the outer peripheral surface of a hose (not shown), an outer band 2 that is connected to the inner band 1 and overlaps the band 1, and a gear formed on the outer band 2. It consists of a worm gear 4 that meshes with a groove 3 and slides the outer band 2, and a housing 5 that rotatably supports the worm gear 4. To operate this hose club, insert the hose into the inner band 1, rotate the worm gear 4 to slide the outer band 2 in the length direction of the band, reduce the winding diameter of the inner band, and This is done by placing the hose in close contact with the outer circumferential surface of the hose. Therefore,
The end of the inner band 1 to which the outer band 2 is connected must be fixed 17 to the housing 5 to serve as a fulcrum during tightening. For this reason, in the past, the housing 5 was formed by processing a single metal plate, and both upper ends of the housing 5 were bent inward, and the bent ends 6 and the inner band 1 were joined together. Welded by welding.

<Problems to be Solved by the Invention> However, in the conventional hose clamp, the connecting force that resists the relative torsional action between the inner bunt 1 and the bent end 6 is weak, and it is difficult to firmly tighten the band. There is a problem that torsional stress acts on the inner band 1 and the bent end portion 6, and the spot welded portion is easily destroyed.

<Means for Solving the Problems> The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to provide a hose clamp in which the inner bunt is firmly connected to the housing.

To achieve the above object, as a result of consideration by the present inventors, the connection force between the inner band and the housing is as large as the connection force in the direction in which the inner band is peeled off, that is, in the direction perpendicular to the inner band. In a free state, no force is required, and it is sufficient that the parts are not separated 17, and a strong connection force can be easily obtained in the direction in which the inner band is tightened, that is, in the longitudinal direction of the inner band (for example, by spot welding) Therefore, we have obtained the knowledge that an important countermeasure for the tightening mentioned above is to strengthen the connection force to resist the torsional stress that sometimes occurs, and based on this knowledge, we have completed the present invention.

That is, in the hose clamp according to the present invention, an abutting surface in a direction intersecting the length direction of the inner band is formed on at least a portion of both end surfaces of a housing obtained by processing a single metal plate, and the abutment surface is formed in a direction that intersects with the length direction of the inner band. The present invention is characterized in that an engaging hole and an engaging protrusion are formed in the housing and the inner band to strengthen the connection force in the longitudinal direction of the inner band.

<Function> Torsional stress that sometimes occurs when tightening a band is generated in a plane parallel to the length direction of the band (inner band), but in the present invention, this torsional stress is generated by fitting into the abutting surface and mutually. It is received by the engagement protrusion and the engagement hole.

<Example> Hereinafter, an example of the present invention will be specifically described with reference to FIGS. 1 to 6. In addition, in the illustrated embodiment,
Since the outer band and the worm gear are unchanged from the conventional example, they will be omitted, and the housing and inner band will be explained.

=4- Fig. 1 is a front view of the housing 10, and Figs. 2 and 3 are its side and bottom views. In the housing 10, a single metal plate 11 is bent into a loop shape by sheet metal processing or the like, and includes a cylindrical upper cavity 12 in which a worm gear is rotatably supported, and a housing 10 connected below the cavity 12. A rectangular cylindrical lower cavity 13 is formed into which the end of the inner band 20 and the outer band are inserted. In the case of Party B,
Both end surfaces 14a and 14b of the metal plate face each other at the bottom of the lower cavity 13, and both end surfaces 14a and 14b are opposite to each other at the bottom of the lower cavity 13.
As shown in the figure, a parallel surface parallel to the length direction of the inner band and a butting surface 1.4c, i in a direction perpendicular to this parallel surface.
4d are connected in a so-called staircase shape. That is, the abutment surface 14C214d intersects the length direction of the inner band perpendicularly, and the torsional stress acting in the length direction of the inner band due to tightening of the band is applied to the abutment surface 1.4.
It can be received by the collision between c and 14d.

This improves the strength against torsional stress.

6. An engaging protrusion 15a that engages the bottom of the lower cavity 13 and the end of the inner band 20.

15b and engagement holes 21a, 2]h are formed first.

In this embodiment, the engagement protrusions 15a, 15b are formed to protrude in a cylindrical shape from the bottom of the lower cavity 13 of the housing 10, and the engagement holes 2]a, 21b are formed in the inner band 20 as shown in FIG. It is perforated at the end. These engaging protrusions 15a, 15b and the engaging holes 21a, 21b are formed to have substantially the same diameter so that they fit into each other, but the engaging protrusions 15a, 1.5b are Both end faces 1
4a.

One hole is formed on each end surface at 17 with 14b as the boundary, and the engaging holes 21a and 21b are connected to the engaging protrusions 15a and 1.
It is drilled at a position corresponding to 5b. By fitting the engagement projections 15a, 15b into the engagement holes 21a, 21b, the torsional stress acting on the inner bunt is received, and the strength of the bunt is further improved. Further, a strong connection force between the inner band 20 and the housing 10 in the longitudinal direction can be obtained by the above-mentioned fitting.

FIGS. 5 and 6 show such an engaging protrusion 15a.

15b is a sectional view showing the assembly of engagement holes 21a and 21b. FIG. The engagement protrusions 15a, 15b are projected in advance to be slightly higher than the thickness of the inner band 20, and the engagement holes 21a, 21b of the inner band 20 are fitted into the engagement protrusions 15a, 15b, respectively. will be combined. Then, the upper ends of the engaging protrusions 15a, 15b are crushed by caulking or the like, and the height of the engaging protrusions 15a, 15b is adjusted to the inner band 2.
Match the plate thickness of 0. As a result, the engaging protrusion 15a.

15b and the inner band 20 are in an engaged state that can sufficiently withstand light loads, and the engagement protrusion 15a.

The upper surface of 15b and the inner band 20 are on the same plane, so that the outer band can slide smoothly. Such an engaging protrusion 15a
, 15b and the inner band 20 are engaged in the direction in which the inner band 20 is peeled from the housing, that is, the inner band 2
The direction is perpendicular to 0, and the load applied in this direction is small, so the crushing process described above can sufficiently withstand it.

In this embodiment as described above, the torsional stress generated by tightening the band is received by the engagement surface and the engagement protrusion hole, so the strength is large and the inner band does not separate from the housing.

Note that various modifications can be made to the present invention; for example, the engagement protrusion may be formed at the end of the inner band, and the engagement hole may be formed at the bottom of the housing. Further, the shapes of these first and other shapes are not limited to those shown in the drawings, but may also be rectangular or elliptical shapes such as J:<,
You may change the number. The engaging protrusion may be formed by a dowel protrusion 15C as shown in FIG. Furthermore, if the abutment surface is formed in a part of the metal plate in a direction intersecting the length direction of the inner band, the desired purpose can be achieved. S” shape,
Or even if it is a sloped surface with a predetermined angle.
, and the “<” shape 2 “S
The abutting surface may be formed of a ``'' shape or a single inclined surface having a predetermined angle.

As described above, according to the present invention, the I of the engagement protrusion and the engagement hole is
t'x to secure the inner bunt together, and abutment surfaces are formed on both end faces of the housing formed by bending the metal plate, so the strength against torsional stress is greatly improved, and the spot = i l. Since connection by welding is not required, rusting is suppressed and the product can be provided at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view of a housing used in one embodiment of the present invention, FIGS. 2 and 3 are side and bottom views thereof,
FIG. 4 is a perspective view of the end of the inner band, FIGS. 5 to 7 are sectional views showing the order of assembly, and FIG. 8 is a perspective view of a conventional example. 1.20 Inner band, 2 Outer band, 4 Worm gear, 5, 10 Housing, 12 Upper cavity,
13 Lower cavity portion, 14a, 14b both end surfaces of metal plate, 14c, 14d abutment surface,

Claims (4)

[Claims] (1) An upper cavity portion of the housing that is bent into a loop shape so that both end surfaces of a single metal plate face each other and rotatably supports the worm gear, and a portion that is continuous with the cavity portion and faces the both end surfaces. A lower cavity portion is formed at the bottom, and an abutting surface in a direction intersecting the length direction of the inner band is formed on at least a portion of the both end surfaces, and an engagement surface that fits into each other is formed. A worm gear type hose clamp characterized in that a hole and an engaging protrusion are formed in the bottom of the lower cavity and the inner band to fix the inner band. (2) The worm gear type hose clamp according to claim 1, wherein the abutting surfaces are formed on part of both end surfaces of the metal plate so as to be perpendicular to the longitudinal direction of the inner band. (3) The engagement hole is formed in the inner band, and the engagement protrusion is formed in the housing.
Worm gear type hose clamp described in ). (4) The worm gear type hose clamp according to claim (3), wherein the housing and the inner band are fixed to each other by crushing an engaging protrusion formed on the housing.