JP4896808B2 - Hose clamp - Google Patents

Description

  The present invention relates to a hose clamp that clamps a hose in a connected state to a rigid mating pipe. Specifically, the fastening band is reduced in diameter by tightening a male screw member, and the hose is connected to a mating pipe and clamped. It relates to a type of hose clamp.

  As a hose clamp that clamps a flexible hose to a rigid mating pipe, connect the hose by inserting the hose into the mating pipe and putting it in the extrapolated state, and tightening the outer peripheral surface of the hose in the reduced diameter direction in that state. What clamps to a state is used widely conventionally.

This type of hose clamp has a rigid fastening band that is particularly suitable for thick hose clamps. By tightening a male screw member in the fastening mechanism, the fastening band is placed on the outer surface of the hose. A worm gear type hose clamp that is reduced in diameter is used.
This hose clamp has (A) a tightening band wound in an annular shape in which a slit-like thread groove is formed on one end side of a rigid band-shaped member and each end portion is overlapped with one end side being the outside. (B) (a) A screw shaft having a male screw formed on the outer peripheral surface, and a head having a diameter larger than that of the screw shaft. The screw thread of the male screw is engaged with the screw groove, and is tightened by rotation. And (b) a tightening mechanism having a housing fixed to the other end side of the tightening band and rotatably holding the male screw member. The outer surface of the hose is tightened in the direction of diameter reduction with a tightening band, and the hose is clamped in a connected state to the mating pipe.

FIG. 5 specifically shows an example thereof.
In the figure, reference numeral 200 denotes a hose clamp, which has a metal fastening band 202 and a fastening mechanism 204.
As shown in FIG. 5B, the tightening band 202 has slit-like thread grooves 206 formed at one end side at a predetermined pitch, and the one end side where the thread grooves 206 are formed faces outward. Each end portion is wound in an annular shape so as to overlap.

On the other hand, the tightening mechanism 204 includes a screw shaft 210 having a male screw 208 formed on the outer peripheral surface, a male screw member 214 having a head 212 having a larger diameter than the screw shaft 210, and a housing 216 that rotatably holds the screw member. Have.
As shown in FIG. 6B, the housing 216 here is a pair of folded parts folded on the back side of the fastening band 202, more specifically, on the inner surface side of the other end side where the slit-like thread groove 206 is not formed. There are curved pieces 218, which are joined together by welding. In the figure, 220 represents the welded portion.
The housing 216 is fixed to the fastening band 202 by engaging the fixing portion 222 formed of the pair of bent pieces 218 with the engaging recess 224 of the fastening band 202.

In the hose clamp 200, when the male screw member 214 is rotated, one end side of the tightening band 202 formed with the thread groove 206 is rotated by a screw feed in the clockwise direction in FIG. And tighten the hose that is extrapolated to the mating pipe to the connected state.
An example of this type of hose clamp is disclosed in Patent Document 1 below.

  In general, when this hose clamp 200 is used to clamp (lock) a hose in a connected state with a mating pipe, the male screw member 214 is rotated under a predetermined torque to set the hose tightening force by the tightening band 202. Manage.

  However, in the case of the hose clamp 200 shown in FIG. 5, the male screw member 214 is rotated, and the end of the tightening band 202 (the upper end in the figure) is rotated clockwise by screw feed, so that the tightening band 202 is rotated. When the diameter is reduced, as shown in FIGS. 6A and 6A, the large-diameter head 212 hits the end of the fastening band 202 (one end on the side where the thread groove 206 is formed) and interferes therewith. The torque applied to the male screw member 214 is partially absorbed by the resistance force generated there, so that even if the male screw member 214 is rotated with a set constant torque and tightened, However, there is a problem in that the tightening band 202 may not always be tightened by the set tightening force.

  Further, when the head portion 212 rides on the upper surface (outer surface) of the end portion of the fastening band 202, a force that raises (lifts) the portion on the right end side in FIG. If the male screw member 214 is forcibly rotated in this state and the tightening band 202 is tightened, as shown in FIGS. 6A (B) and B (B), the welded portion 220 of the pair of bent pieces 218 and 218 is excessively moved. As a result, the bent pieces 218 and 218 are peeled off at the welded portion 220, which causes the housing 216 to be greatly inclined at the mounting position on the fastening band 202, or in some cases, detached from the fastening band 202 and tightened. There is a problem that leads to the destruction of the attaching mechanism 204.

Japanese Patent No. 3473594

  The present invention is based on the circumstances as described above, and when the male screw member is rotated with a constant torque, the hose outer peripheral surface can be securely tightened with the intended tightening force by the tightening band. The object of the present invention is to provide a hose clamp that does not cause damage to the tightening mechanism even when the member is rotated with a strong force.

Thus, according to the first aspect of the present invention, (A) a slit-like thread groove is formed at one end side of the rigid band-like member at a predetermined pitch, and the ends are overlapped with the one end side being outside. (B) (a) a screw shaft having a male screw formed on the outer peripheral surface thereof, and a head having a diameter larger than that of the screw shaft. (B) a housing fixed to the other end side of the fastening band and rotatably holding the male screw member. And tightening the outer peripheral surface of the hose in the diameter-reducing direction by the tightening band and clamping the hose in a connected state to the mating pipe. In the worm gear type hose clamp, the male screw of the male screw member is inserted into the screw groove. With threads for engaging inlet makes with the external thread of the tapered shape gradually increased in diameter toward the side of the head, the axis of the screw shaft the housing in a direction front SL head away from the clamping band the state of being inclined with respect to the tangential direction of the fastening band at the mounting position of the clamping mechanism, the Ri Nashitea and holds the male screw member, said housing, said second end of said fastening band And having a pair of bent pieces on the back side opposite to the one end side, and forming a fixing part to the other end side by welding the pair of bent pieces to each other. The pair of bent pieces are welded to each other at a position close to the head side of the male screw member.

According to a second aspect of the present invention, in the first aspect, the pair of bent pieces are located on the head side from a portion separated from the end of the bent piece on the side opposite to the head side. It is characterized by being welded and joined at the close position until reaching the end.

According to a third aspect of the present invention, in the second aspect of the present invention, the part separated from the head side is more than the center of the end of the bent piece opposite to the head and the end of the head side. It is the site | part close | similar to the edge on the opposite side to a part, It is characterized by the above-mentioned.

Effects and effects of the invention

As described above, the present invention makes the male thread of the male thread member a tapered male thread in which the thread that engages the thread groove of the fastening band gradually increases in diameter toward the head side of the male thread member, The male screw member is held in a state in which the axis of the screw shaft is inclined in the direction in which the head is separated from the tightening band with respect to the tangential direction of the tightening band at the mounting position of the tightening mechanism. According to the present invention, since the head of the male screw member is located farther from the tightening band with respect to the conventional hose clamp, the male screw member is rotated to reduce the diameter of the tightening band, When the hose is tightened from the outer peripheral surface, it is possible to avoid the head of the male screw member from colliding with the end of the tightening band that rotates to the head side by screw feed.
Therefore, due to the interference between the head and the tightening band, the tightening torque applied to the male screw member is partially absorbed there, thereby eliminating the problem that the tightening force on the hose becomes weaker than the set tightening force. be able to.

  Also, since the head of the male screw member rides on the outer surface of the fastening band, a strong force does not act on the housing in the direction of pulling it away from the fastening band, so the male screw member is rotated with a strong force, Even when the tightening with the tightening band is performed strongly, the problem that the housing is peeled off partially or entirely from the tightening band and the tightening mechanism is damaged can be solved.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, reference numeral 10 denotes a hose clamp according to this embodiment, which has a tightening band 12 and a tightening mechanism 14.
The fastening band 12 is formed in a ring shape in such a manner that slit-like thread grooves 16 are formed at a predetermined pitch on one end side of a rigid metal band-shaped member, and the end portions 12A and 12B are overlapped with the one end side being the outside. It is rolled up.
As shown in FIG. 2B, the tightening mechanism 14 includes a metal male screw member 18 and a metal housing 20 that rotatably holds the member.
The male screw member 18 has a screw shaft 22 and a head portion 24 having a larger diameter and a hexagonal outer shape, and the male screw 26 extends along the outer peripheral surface of the screw shaft portion 22. The pitches corresponding to the thread grooves 16 are provided.

On the other hand, the housing 20 includes a cylindrical wall portion 28 having a substantially semicylindrical shape as shown in FIG. 3A, a pair of arms 30 extending downward from the cylindrical wall portion 28 in the drawing, It has a pair of bent pieces 32 bent inward at the lower end.
The pair of bent pieces 32 are joined and integrated with each other at a welded portion 38 as shown in (C) to form a plate-like fixing portion 34.
The housing 20 is fixed to the tightening band 12 by engaging the fixing portion 34 with the tightening band 12, specifically, an engagement recess 40 formed in the end 12 </ b> B.

The said cylindrical wall part 28 becomes a main-body part in the housing 20, and accommodates the external thread member 18, specifically the external thread 26 of the screw shaft 22, in the inside so that rotation is possible.
The cylindrical wall portion 28 is integrally provided with inward (downward in the drawing) flange portions 36 at both axial ends. These flange portions 36 prevent the male screw member 18 from coming off the housing 20 by abutting against the male screw 26.

In the present embodiment, as shown in FIG. 3 (B), the male thread 26 in the male thread member 18 is specifically thread 26-1, 26- engaged with the slit-like thread groove 16 of the fastening band 12. 2, 26-3 and 26-4 gradually increase in diameter toward the head 18. That is, the male screw 26 has a tapered shape in which the diameter gradually increases toward the head 18.
Then, the axis P of the male screw member 18 is such that each screw thread 26-1, 26-2, 26-3, 26-4 can be engaged with the screw groove 16 of the fastening band 12 as shown in FIG. while tangential clamping band 12, strictly inclined at an angle theta ₁ with respect to the tangential direction parallel in the attaching position of the clamping mechanism 14 shown in and held by the housing 20.
The housing 20 has a shape in which a cylindrical wall portion 28 having a semi-cylindrical shape is inclined obliquely upward to the right in the figure at an angle corresponding to the taper angle of the male screw 26 in order to hold the male screw member 18 in such an inclined state. It is configured.

In the present embodiment, the welded portion 38 of the pair of bent pieces 32 in the housing 20 is positioned at the right side in the drawing as shown in FIG. That is, the bent pieces 32 and 32 are welded to each other at a position close to the head 24 side of the male screw member 18.
For this reason, even if an upward force in the drawing acts on the right end portion of the housing 20 by the rotation operation of the male screw member 18, that is, when the fastening band 12 is tightened, the welding is performed by this force. The pair of bent pieces 32 are separated from each other at the portion 38, and the fixing of the housing 20 to the tightening band 12 becomes insufficient, or the housing 20 is partially or entirely detached from the tightening band 12 and the tightening mechanism 14. Is effectively prevented from being damaged or destroyed.

FIG. 4 shows a procedure for clamping the hose H to the connected state using the hose clamp 10 of the present embodiment.
As shown in the figure, first, a hose clamp 10 is loosely fitted on an elastic and flexible hose H such as a rubber hose, and in this state, the hose H is swelled radially outward at the tip. It inserts in the rigid other party pipe 42 which has the protrusion part 44, and is set as an extrapolation state.
Thereafter, the male screw member 18 of the tightening mechanism 14 in the hose clamp 10 is rotated with a set torque to reduce the diameter of the tightening band 12, and the hose H is moved from the outer peripheral surface to the mating pipe 42 by the diameter of the tightening band 12. Tighten and clamp the hose H in the connected state.

At the time of tightening, in the hose clamp 10 of the present embodiment, the male screw member 18 has an angle θ with respect to the tangential direction of the fastening band 12 even though the male screw 26 of the male screw member 18 has a tapered shape. ₁ , the screw threads 26-1, 26-2, 26-3 and 26-4 of the male screw 26 are satisfactorily engaged with the slit-like screw groove 16 of the fastening band 12. The end 12A of the tightening band 12 can be rotated in the clockwise direction in FIG. 2B by screw feed by its own rotation, and the diameter of the tightening band 12 can be reduced.
On the other hand, since the head portion 24 of the male screw member 18 is separated from the fastening band 12 in the upper side in the figure, even if the end portion 12A of the fastening band 12 is rotated to the head portion 24 side, the head portion 24 is the end portion. Interference with 12A can be avoided.

In the present embodiment as described above, the head 24 of the male screw member 18 is positioned farther from the tightening band 12 than the conventional worm gear type hose clamp, so the male screw member 18 is rotated to tighten the tightening band. When the diameter of 12 is reduced and the hose H is tightened from the outer peripheral surface, the head 24 of the male screw member 18 hits and interferes with the end 12A of the tightening band 12 that advances toward the head by screw feed. Can be avoided.
Accordingly, due to the interference between the head 24 and the tightening band 12, a part of the tightening torque applied to the male screw member 18 is absorbed there, whereby the tightening force for the hose H becomes weaker than the set tightening force. Can be solved.

  Further, since the head 24 of the male screw member 18 rides on the outer surface of the fastening band 12, the force in the direction of pulling the housing 20 away from the fastening band 12 does not act strongly. Even when the tightening band 12 is strongly tightened, the problem that the housing 20 is partially or entirely peeled off from the tightening band 12 and is damaged can be solved.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a perspective view of the hose clamp which is one Embodiment of this invention. (A) is a side view of the hose clamp of the embodiment, (B) is an enlarged view of the tightening mechanism. It is the figure which showed the housing and male screw member of the clamping mechanism in the hose clamp of the embodiment in the state of each single item. It is a figure which shows the procedure of the connection of the hose using the hose clamp of the embodiment. It is a figure which shows an example of the conventional hose clamp. It is a figure for demonstrating the malfunction of the hose clamp of FIG.

DESCRIPTION OF SYMBOLS 10 Hose clamp 12 Tightening band 26-1, 26-2, 26-3, 26-4 Thread 14 Tightening mechanism 16 Thread groove 18 Male thread member 20 Housing 22 Screw shaft 24 Head 26 Male thread 42 Counter pipe P axis

Claims (3)

(A) a tightening band wound in an annular shape in which slit-like screw grooves are formed at a predetermined pitch on one end side of a rigid band-shaped member and each end portion is overlapped with the one end side being the outer side;
(B) (A) a screw shaft having a male screw formed on the outer peripheral surface, and a head having a diameter larger than that of the screw shaft, the thread of the male screw is engaged with the screw groove, and A tightening mechanism comprising: a male screw member for reducing the diameter of the tightening band; and (b) a housing fixed to the other end of the tightening band and rotatably holding the male screw member;
A worm gear type hose clamp that clamps the hose in a connected state to the mating pipe by tightening the outer peripheral surface of the hose in the diameter-reducing direction with the clamping band in a state where the hose is extrapolated to a rigid mating pipe wherein the external thread of the male screw member, together with the threads that engaged makes with the external thread of the tapered shape gradually increased in diameter toward the side of the head to the screw groove, the housing, is pre-Symbol head the clamping in the axis of the screw shaft in a direction away from the biasing band state of being inclined with respect to the tangential direction of the fastening band at the mounting position of the fastening mechanism, Ri Nashitea and to hold the externally threaded member,
The housing has a pair of bent pieces on the back side opposite to the one end side of the other end side of the fastening band, and the pair of bent pieces are welded to each other. A fixing part to the other end side,
The pair of bent pieces are welded to each other at a position close to the head side of the male screw member. 2. The pair of bent pieces according to claim 1, wherein the pair of bent pieces are from the part separated from the end opposite to the head of the bent pieces to the end on the head side. A hose clamp characterized by being welded and joined at a close position. In Claim 2, the part spaced apart to the head side is an end opposite to the head from the center of the end of the bent piece opposite to the head and the end of the head side. A hose clamp characterized by being a part close to.

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