JPH0735111A - Clamp provided with spring - Google Patents

Abstract

PURPOSE:To provide a clamp provided with spring, by which a substance to be fixed can be fixed at a low cost, and which satisfies the function of a conventional clamp by forming the entire cramp by single parts, simplifying fastening work, and by increasing the tightening force of the part separated from the fastening part. CONSTITUTION:A clamp 1 comprises a band 2 made of plate spring, which has a cylindrical surface, an engagement mechanism 11 for engaging the both ends of a band 1, the hooked parts 5, 5 of a pair of sandwiching tools, which are formed in such a way that the engagement mechanism 11 is sandwiched between the one end side and the other end side of the band 2, and which are formed by protruding a part of a place spring 6 forming the band 2 to the outside, and the plate spring 6, for which the intermediate part of the band 2 is stamped into a specific shape and the part surrounded by a stamping line is curved inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band-shaped clamp for fixing a cover or the like to the outer periphery of a pipe, and more particularly to a spring-loaded clamp suitable for fixing an insulator of an exhaust pipe of an automobile engine.

[0002]

2. Description of the Related Art The exhaust pipe of an automobile engine is covered with an insulator made of an aluminum cover in the vicinity of the catalytic converter for purifying exhaust gas and other necessary parts in order to prevent the surroundings from being burnt out due to heat radiation. . The insulator is fastened to the main part of the exhaust pipe by being stopped by a band-shaped clamp. Conventionally, as this clamp,
A structure composed of a band-shaped metal plate band having a substantially cylindrical surface, a flanged plate with holes formed by bending both ends thereof outward, and bolts and nuts for overlapping the fastening plates at both ends and inserting and fastening the holes. Stuff was being used.

[0003]

The above-mentioned conventional clamp has a large number of parts, requires a lot of labor for fastening, is high in cost, and has an object to be fixed (insulator) by a band.
The binding force to V is large in the vicinity of the fastening portion, and the binding force is low in the farthest portion of the fastening portion, and there is a drawback that a uniform clamping force cannot be obtained. The object of the present invention is to construct the entire clamp with a single component, simplify the fastening work, and increase the binding force of the portion away from the fastening portion. It is to provide a spring-loaded clamp satisfying the same clamp mechanism as the above.

[0004]

The clamp of the present invention comprises:
A band made of a metal plate having a substantially cylindrical surface, an engaging mechanism for engaging both ends of the band, and the engaging mechanism formed on one end side and the other end side of the band to form the band. It is composed of a pair of pinching tools formed by projecting a part of the leaf spring outward and a leaf spring bulged inward of the band at an intermediate portion of the band.

[0005]

The operation and effect of the present invention has the following effects. a) The engagement mechanism can be easily engaged by sandwiching the hooking portion with a tool, and the engagement mechanism can be easily disengaged by sandwiching the inclined plate with the tool and pulling it in the inclination direction. b) It can be used as a clamp as it is as it is manufactured and does not require other parts. c) Since the spring is provided, the binding force of the fixed object at a position apart from the engagement mechanism can be increased, and the fastening of the object to be fastened can be performed securely and firmly.

[0006]

1 to 4 show a clamp 1 with a spring according to a first embodiment of the present invention. The clamp 1 has a leaf spring band 2 having a substantially cylindrical surface. A rectangular punched hole 31 is formed at one end of the band 2 to form a retaining ring 3, and a tip end thereof is an inclined plate 32 inclined outward. At the other end of the band 2, a hook 4 that forms an engaging mechanism 11 together with the retaining ring 3 is provided. The hook 4 includes a wedge plate 41 extending from the other end of the band 2 and the wedge plate 41.
Pair of dorsal fin claws 4 protruding outward from both sides of the tip of the
It consists of 2, 42. The front edge 43 of each claw 42 is a curved edge having a substantially arc shape, and the rear edge 44 is a straight edge having a receding angle.

In the engagement mechanism 11, the hook 4 enters the retaining ring 3 and the rear edges 44, 44 of the pawls 42, 42 are inclined plates 32.
The upper surface 33 is brought into contact with the upper surface 33 to be detachably engaged. If the rear edges 44, 44 and the inclined plate 32 are both acutely angled with respect to the tangential direction, it is difficult to disengage them. Also, the trailing edge 44,
44 and the upper surface 33 have almost the same height (the difference is within 1 mm)
It is desirable to set the above to the extent that the amount of protrusion of the band 2 from the cylindrical surface to the outside is reduced.

At both ends of the band 2, a pair of hooks 5 and 5 formed by bulging the band wall outward are provided so that the band 2 can be pinched by a pinching tool 200 (see FIG. 3). ing. In this embodiment, the hooks 5, 5 are
Forming a pair of substantially U-shaped punches 21 and 22 in a backward direction on both ends of the band 2 and bending the remaining portion surrounded by the punched portions 21 and 22 outward to form a semicircle having a small curvature or more. It is formed in a substantially cylindrical surface shape. The hooking portion 5 of this structure has a merit that the amount of protrusion from the outer peripheral surface of the band 2 can be set to be large, and the work of sandwiching with the sandwiching tool is easy to perform. In addition,
The punched-out portions 21 and 22 may have other shapes such as a U-shape and a V-shape, which are folded back.
If the tip ends 51, 51 of 5 are rounded as shown in the drawing and the edges are taken, it is possible to prevent an operator from injuring a hand or the like.

In the middle portion of the band 2, two leaf springs 6,
6 is formed by displacing a part of the band wall inward. The leaf springs 6 and 6 are formed by providing a long H-shaped punching 23 facing the band wall along the longitudinal direction and displacing the remaining portion inward.
No. 1 is bent outward to prevent the pressing force from concentrating on the held member. Since the binding force to the object to be fastened (insulator) which is held by the clamp 1 at the time of use is the largest in the vicinity of the engaging mechanism 11, and the farthest portion of the engaging mechanism 11 has a lower binding force, the leaf springs 6, 6 are used. Has a function of reinforcing the binding force of the intermediate portion of the band 2 (the farthest portion from the fastening portion) where the binding force is the lowest.

Before use, the clamp 1 has both ends 2A and 2B of the band 2 open, as shown in FIGS. 2 (a) and 2 (b), and is fitted to the exhaust pipe 101 shown in FIG. 4 through this opening. The heat insulating material 102 is externally fitted to the fastening portion of the insulator (aluminum tubular jacket) 103. Next, using the pliers-shaped pinching tool 200 shown in FIG.
When the two ends 2A and 2B are butted with each other so as to sandwich them, the front edge 4 of the claws 42, 42 is attached to the inclined lower surface 34 of the inclined plate 32.
3,43 contact.

When further pinched by the pinching tool 200, the front edges 43, 43 and the lower surface 34 slide and the claws 42, 42 enter into the rectangular punched hole 31. Clip tool 2 in this state
When 00 is loosened, the claws 42, 42 are hooked on the inclined upper surface 33 of the inclined plate 32 with the trailing edges 44, 44. To disengage the engaging mechanism 11, the inclined plate 32 is grasped by the pinching tool 200 and pulled in the direction of arrow K shown in FIG.

5 and 6 show a second embodiment. In this embodiment, a U-shaped punch 24 is formed on the wall of the band, and the remaining portion is displaced inward so that the plate spring 6 in the shape of a cantilever 3 is formed.
Individually arranged. The hook portions 7, 7 have a bridge shape in which the middle of the slits 25, 25 formed in the band wall in parallel with the axial direction is outwardly bulged and deformed in an arc shape. The hook portions 7, 7 of this structure have high strength to withstand a large external force, and are suitable when the band 2 is thin. The number of leaf springs 6 may be four or more as required.

FIG. 7 shows a third embodiment. In this embodiment, an oval punching hole 8 is provided between the hook portions 7, 7 and the leaf springs 6, 6. The punching hole 8 is the band 2
This portion has a function of preventing the rigidity of this portion from becoming larger than that of the other portions, and making the rigidity uniform.
The binding force applied to 03 is equalized. The engagement mechanism 11
May have another structure as long as it can be attached and detached with one touch.

FIG. 8 shows a fourth embodiment. In this embodiment, in addition to the configuration of FIG. 1, the leaf springs 6, 6 are formed separately, and the root ends 62, 62 thereof are fixed to the wall surface of the band 2. As shown in the figure, the fixing is performed by a desired method such as studs and welding other than caulking. In this case, the material of the band 2 does not necessarily have to be the spring material, and only the leaf spring 6 may be used as the spring material.

[Brief description of drawings]

FIG. 1 is a perspective view of a clamp according to a first embodiment of the present invention.

2A and 2B are a plan view and a front view of a main part in a state where a clamp according to the first embodiment is opened.

FIG. 3 is a front view and a left side view of the clamp according to the first embodiment in a closed state.

FIG. 4 is a usage state diagram of the clamp according to the first embodiment.

FIG. 5 is a front view of the clamp according to the second embodiment of the present invention in an opened state.

6A and 6B are a left side view and a front view of a clamp according to a second embodiment in a closed state.

FIG. 7 is a left side view of the clamp according to the third embodiment of the present invention.

FIG. 8 is a perspective view of a clamp according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Clamp 2 Band 3 Retaining Ring 4 Hooks 5 and 7 Hooking Part 6 Leaf Spring 8 Punching Hole 11 Engaging Mechanism 41 Wedge Plate 42 Claw 200 Clamping Tool

Claims (7)

[Claims] 1. A metal plate band having a substantially cylindrical surface, an engagement mechanism for engaging both ends of the band, and one end side and the other end side of the band formed so as to sandwich the engagement mechanism, A clamp composed of a hooking portion of a pair of pinching tools formed by protruding a part of a leaf spring forming the band outward, and a leaf spring bulged inward of the band at an intermediate portion of the band. . 2. The clamp according to claim 1, wherein the leaf spring is formed by punching an intermediate portion of the band into a predetermined shape and bending a portion surrounded by the punching line inward. 3. A leaf spring band having a substantially cylindrical surface, and a retaining ring formed by forming a punched hole at one end of the band and having an inclined plate whose tip is inclined outward, and It consists of a wedge plate portion extending the other end of the band and a pair of dorsal fin-like pawls protruding outward from both sides of the tip end portion of the wedge plate portion and enters the retaining ring so that the pawl is engaged with the inclined plate. An engaging mechanism composed of mating hooks, and one end side and the other end side of the band are formed so as to sandwich the engaging mechanism, and a part of a leaf spring forming the band is formed to project outward. A clamp comprising a pair of hooking parts of a sandwiching tool, a cantilever spring formed by punching an intermediate part of the band into a predetermined shape, and bending the part surrounded by the punching line inward. 4. The method according to any one of claims 1 to 3,
The hooking portion of the sandwiching tool has a U formed on the band.
A clamp characterized by being formed by bending outward a portion surrounded by a punching line having a folded shape such as a V shape, a V shape, and a U shape. 5. The clamp according to claim 3, wherein the inclined plate portion has an acute inclination angle with respect to a tangential direction. 6. The punching hole according to claim 3,
A clamp formed by biting into the inclined plate. 7. The method according to any one of claims 1 to 6,
A clamp for fixing an insulator, which is placed on the outer circumference of an exhaust pipe of an automobile engine, to the exhaust pipe.