JP3362327B2 - Hose clamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose clamp for tightening and fixing rubber hoses to an end of a connecting pipe, and in particular, to a hose clamp having an enhanced tightening force. It is about. 2. Description of the Related Art Generally, a general hose clamp is formed by bending one metal flat plate and forming a projecting piece bent outward on one end side of an annular main body. At the same time, a guide groove is formed from the protruding piece to the annular main body, and a small width dimension is provided to the other end side so that the guide groove can be moved in the guide groove, and the distal end edge thereof is also outward. It is configured to form a bent protruding piece. Therefore, when using such a hose clamp, for example, a pair of intersecting protruding pieces are brought close to each other by using a clipping tool such as a pliers, and while the diameter of the annular main body is increased, an object to be tightened is tightened. When the approach of each of the protruding pieces is released after being externally fitted on the rubber hose, the other end of the small width shifts in the guide groove and allows the diameter of the annular main body to be reduced. Then, the rubber hose is automatically tightened. [0004] However, if it is desired to increase the tightening force under the hose clamp, it is sufficient to increase the plate thickness. However, if the plate thickness is excessively increased, the annular shape is required. When the diameter of the main body is expanded, there is a sufficient risk of causing plastic deformation. Further, a guide groove is formed in one end of the annular main body, and the other end has a small width corresponding to the guide groove. There was also a concern that the width was reduced and the tightening force was reduced. [0005] In view of such circumstances, Japanese Utility Model Publication No. 52-1
Japanese Patent No. 6436 proposes a reinforced hose clamp. Although not specifically shown, the reinforced hose clamp has a double structure including an inner clamp body and an outer clamp body, and for the former inner clamp body,
It is bent into an annular shape with a metal flat plate, and a pair of projecting pieces similar to those of a general one are formed at both ends thereof. It bends, but does not form a projection like the inner clamp body,
The two ends are abutted against each other. Therefore, in actual use, if the outer clamp body is slightly overlapped with the outer periphery of the inner clamp body and overlapped with the outer clamp body, then, similarly to the above-described hose clamp, a clamp such as a pliers is used. By using the inner clamp body, the inner and outer clamp bodies can be expanded at the same time by approaching each protrusion of the inner clamp body. Conversely, by releasing the approach of each protrusion, the inner and outer clamp bodies can be simultaneously reduced in diameter. Becomes possible,
In addition, in the tightened and fixed state of the rubber hose, the tightening force of the outer clamp body is applied to the inner clamp body, and the rubber hose is tightened by the inner clamp body. A firm tightening and fixing state of the rubber hose can be guaranteed. However, the use of a double structure in the conventional reinforced hose clamp may certainly be effective in increasing the tightening force. On the other hand, since the inner and outer clamp bodies having different shapes must be separately formed, it goes without saying that the mold cost and the material cost will increase. Since the device and jig for the overlap fitting with the slightly enlarged diameter become considerably large, there is a tendency that the clamp itself naturally increases in cost. Further, under the above-mentioned double structure, it is necessary to form a cutout hole for dispersing bending stress in the inner and outer clamp bodies. SUMMARY OF THE INVENTION The present invention has been developed in order to effectively solve the problem of the conventional reinforced hose clamp. Is formed with a protruding piece bent outwardly, a guide groove is formed from the protruding piece to the annular main body, and a small width dimension capable of moving in the guide groove is provided on the other end side. Giving a protruding piece bent outward at the leading edge thereof, and bringing each protruding piece closer, the annular body expands in diameter. In the hose clamp for reducing the diameter, a configuration is adopted in which a spirally wound elastic reinforcing body is fitted around the outer periphery of the annular main body so that a part thereof passes through the inside of the opening of the protruding piece on the one end side. Therefore, under the hose clamp of the present invention, not only for the entire annular body, but also for a portion where the tightening force is likely to be reduced due to the guide groove and the small width dimension. In addition, the presence of the elastic reinforcement makes it possible to effectively enhance the tightening force, and when fitting the elastic reinforcement, it is possible to use a large-scale device or jig as in the related art. By using the spirally wound shape of the elastic reinforcement, the elastic reinforcement can be easily fitted simply by screwing it into the outer periphery of the annular body, so that the cost of the hose clamp itself can be reduced. Can contribute to BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention. First, the hose clamp according to the first embodiment will be described. As shown in FIG. 1, the hose clamp is, as shown in FIG. Is formed,
On the one end 1a side of the annular main body 1, a projecting piece 2 that is bent outward is formed, and from the projecting piece 2, the annular main body 1 is formed.
The guide groove 3 is bored, and the other end 1b side is provided with a small width dimension that can move inside the guide groove 3, and a protruding piece 4 that is also bent outward at the tip edge thereof. The feature is that a spirally wound elastic reinforcing member 5 is fitted around the outer periphery of the annular main body 1. More specifically, the spirally wound elastic reinforcing member 5 is formed from a metal spring wire (for example, S-D60C) having a rectangular, round or other irregular cross section. Under this embodiment, as shown in FIG. 2, about 2 turns, more precisely, 1 and 5/6 turns are used, but the number of turns is not limited to this. Instead, it can be freely determined in consideration of the board width and the like. However, at least the center portion of the elastic reinforcing member 5 passes through the inside of the opening of the projecting piece 2,
When the annular body 1 is enlarged or reduced in diameter, there is no fear of falling off from the annular body 1 and the projecting piece is used when the other end 1b of the annular body 1 moves in the guide groove 3 of the one end 1a. It is necessary to set so as not to hinder the movement of the other end portion 1b, including the position No.4. It is preferable that the inner diameter is set to be smaller than the outer diameter of the annular main body 1. Therefore, when assembling the hose clamp according to the first embodiment, since the elastic reinforcing member 5 has a spiral winding shape, the elastic reinforcing member 5 can be used without using a large-scale device or jig as in the prior art. The elastic fitting 5 can be easily fitted simply by screwing the elastic reinforcing member 5 around the outer periphery of the annular main body 1 by positively utilizing the spiral winding shape. In addition, when the elastic reinforcing member 5 is in the fitted state, as shown in FIGS. 3 and 4, a portion where the tightening force is likely to be reduced, that is, both side edges of the one end 1 a defining the guide groove 3. Also, a part of the elastic reinforcing member 5 is necessarily tightly pressed against the other end 1b having a small width. Although not specifically shown, the pair of projecting pieces 2 and 4 intersecting each other are brought close to each other by using a pliers or the like in a similar manner to an ordinary one, although not specifically shown. Then, while the outer diameter of the annular main body 1 is expanded and fitted onto a rubber hose to be tightened, the approach of the protruding pieces 2 and 4 is released, and the other end 1 b of the small width dimension is inserted into the guide groove 3. To allow the diameter of the annular body 1 to be reduced, whereby the rubber hose is automatically tightened.
It is needless to say that when the annular body 1 is expanded or reduced in diameter, the spirally wound elastic reinforcing body 5 is also expanded or reduced in diameter accordingly. At times, the roundness is maintained by the elastic reinforcement 5. In addition, when the rubber hose is in a tightened and fixed state, the elasticity is not only applied to the entire annular main body 1 but also to a portion where the tightening force may be reduced. A part of the reinforcing member 5 is tightly and elastically contacted to effectively increase the tightening force, so that a uniform and strong tightening state of the rubber hose can be ensured. Next, the hose clamp according to the second embodiment will be described. In contrast to the above-described first embodiment which uses one elastic reinforcing member 5 wound about two times, 5, two elastic reinforcements 5A and 5B having different winding directions on the left and right are used as shown in FIG. Note that the conditions of the first embodiment are the same as those of the first embodiment, except that the elastic reinforcing members 5A and 5B are wound about one turn. Therefore, even when assembling the hose clamp according to the second embodiment, the respective elastic reinforcing members 5A and 5B are screwed into the outer periphery of the annular main body 1 from each side by utilizing the spirally wound shape. Only the two elastic reinforcements 5A and 5B can be easily fitted, and the annular main body 1
As shown in the figure, in addition to the enhancement of the overall tightening force, the elastic reinforcing members 5A and 5B may have a portion where the tightening force is likely to be reduced, that is, both side edges of the one end 1a defining the guide groove 3, The rubber hose is elastically pressed against the other end portion 1b having a small width to effectively enhance the tightening force of each portion, so that a uniform and strong tightening state of the rubber hose can be guaranteed. . Incidentally, this can be said for the elastic reinforcing members 5, 5A, 5B used in each embodiment. However, it is possible to form them by cold working and change the cross-sectional shape, the inner diameter, and the number of windings as appropriate. For example, the strength of the tightening force of the hose clamp itself can be easily adjusted, and the tightening force can be easily adjusted by the difference between the inner diameter of each of the elastic reinforcing members 5, 5A, 5B and the outer diameter of the annular body 1. The amount of reinforcement can be adjusted. As described above, according to the present invention, not only the tightening force can be rationally enhanced by adopting the above configuration, but also
It is needless to say that cost reduction can be expected by itself because the elastic reinforcing member only has a spiral winding shape. However, especially when the elastic reinforcing member is fitted on the outer periphery of the annular main body, a large-sized device as in the related art is used. Since it is only necessary to use the shape of the hose clamp and screw it in without using a jig or jig, this also contributes greatly to reducing the cost of the hose clamp itself. In addition, it is not necessary to form a cutout hole for dispersing bending stress in the annular body, so that workability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a hose clamp according to a first embodiment. FIG. 2 is a front view of an elastic reinforcement used in the first embodiment. FIG. 3 is a perspective view showing a state in which an elastic reinforcing member is fitted to an outer periphery of an annular main body under the first embodiment. FIGS. 4A and 4B are front views showing a state in which an elastic reinforcing member is fitted to the outer periphery of an annular main body, with the position being shifted. FIG. 5 is a front view showing the hose clamp according to the second embodiment in a state in which an elastic reinforcing member is fitted. DESCRIPTION OF SYMBOLS 1 Annular body 1a One end 1b of an annular body 2b The other end 2 of an annular body 2 Protrusion piece 3 on one end side Guide groove 4 Protrusion piece 5 on the other end side Elastic reinforcement 5A Elastic reinforcement 5B elastic reinforcement

──────────────────────────────────────────────────続 き Continuation of the front page (56) Reference Jikken Sho 52-16436 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 33/10

Claims (1)

(57) [Claim 1] A projecting piece bent outward is formed on one end side of the annular main body, and a guide groove is formed from the projecting piece to the annular main body. Perforated, the other end side is given a small width that can move in the above guide groove, and a protruding piece bent outward is formed at the tip edge, and each protruding piece is approached. Then, when the annular body expands in diameter and releases the approach of each protruding piece, in the hose clamp where the annular body reduces in diameter,
A hose clamp characterized in that a spirally wound elastic reinforcing body is fitted around the outer periphery of the annular body so that a part thereof passes through the inside of the opening of the projecting piece on the one end side.