Two-pipe clamp

Details Two-pipe clamp Two-pipe clamp

2000-06-05

2001-10-30

Braun, Leslie A. (Department: 3632)

Supports

Pipe or cable

Brackets

C248S074200

Reexamination Certificate

active

06308921

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a two-pipe clamp or clip with two clamping bodies forming a pair of clamping cheeks. Between the cheeks two passages are formed, with each passage intended for a tubular body. The cheeks can be pressed against one another by at least one tightening screw extending between the passages from a cover plate on the top end to base plate. The pair of clamping cheeks are held between the cover and base plates.
BACKGROUND OF THE INVENTION
Pipe clamps for two pipes are known commercially, and are disclosed in DIN 3015, Part 3. With pipe clamps of this structural type, only rigid materials are considered for the production of the plastic bodies forming the clamping cheeks, for example, polypropylene plastics of PA (polyamide) materials, because the force resulting from the tightening torque generated by the tightening screw is transferred directly onto the clamping bodies and the inserted and clamped pipes or similar conduit systems. When materials of low inherent stability are used, the omission of a limiting device for the tightening torque risks deformation or damage to the pair of clamping cheeks if the tightening torque is too high. On the other hand, when the tightening torque is too low, the clamped pipes could burst forth from the side of the clamping arrangement.
However, the use of rigid materials for the clamping bodies, due to the poor sound and vibration stabilization or attenuation of the rigid materials, is not advantageous. Also, sensitive pipes or other types of conduit systems can be damaged by being clamped between hard or rigid plastic bodies.
SUMMARY OF THE INVENTION
Objects of the present invention are to provide a two-pipe clamp with improved operation properties.
The foregoing objects are basically attained by a two-pipe-clamp comprising first and second clamping bodies defining first and second passages therethrough, each for receiving a tubular body. Each clamping body has an outer end surface, two side surfaces extending from the outer end surface and an inner end surface having recesses defining the passages. The passages are spaced from said side surfaces. A top cover plate is adjacent the outer end surface of the first clamping body. A base plate is adjacent the outer end surface of the second clamping body. A tightening screw extends through the clamping bodies between the passages, and extends from the cover plate to the base plate. First and second securing strips each have a central segment and two bent legs extending from opposite sides of the respective central segment. The central segments of the first and second security strips extend between the cover plate and the first clamping body and between the second clamping body and the base plate, respectively. The legs extend along the side surfaces and have leg ends remote from the respective central segments. The respective ends of the first and second security strips face one another and engage one another to limit compression of the clamping bodies and clamping forces thereof.
The framing of the pairs of clamping bodies provided in the present invention permits the use of softer materials for construction of the pair of clamping bodies, without generating the risk of the pipe or similar conduit systems bursting forth from the side upon loading or under stress. The desired beneficial damping or attenuating properties are also obtained. The security strips also limit the clamping force by the cooperation of the legs at the sides of the frames. The risk of deformation or damage to the pair of clamping bodies is also avoided, which could otherwise result from the force produced by excessive torque from the tightening screw.
The security strips are preferably formed by a C-shaped bent sheet of metal, preferably sheet steel.
A thermoplastic elastomer, for example, a synthetic rubber, can be provided as the material for the clamping body. The Shore hardness of that material preferably lies in the range of approximately 50 to 75.
The two-pipe clamp according the present invention can be provided with a base plate serving as a welding plate. On the interior of the base plate, a nut can be provided for cooperation with the tightening screw.
Alternatively, the base plate can be formed by a supporting rail in the form of a hollow profile with a longitudinal slot. In this case, the tightening screw works in cooperation with a supporting rail nut which extends through the longitudinal slot and out of the interior space of the hollow profile in which is held a bayonet foot of the supporting rail nut.
Other objects, advantages and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, disclose a preferred embodiment of the present invention.


REFERENCES:
patent: T100605 (1981-05-01), Christian
patent: 2354919 (1944-08-01), Lockwood
patent: 2355742 (1944-08-01), Morehouse
patent: 2361943 (1944-11-01), Issoglio et al.
patent: 2404531 (1946-07-01), Robertson
patent: 3531071 (1970-09-01), Kubli
patent: 3856244 (1974-12-01), Menshen
patent: 3982304 (1976-09-01), Menshen
patent: 4273465 (1981-06-01), Schoen
patent: 5257768 (1993-11-01), Juenemann
patent: 5794897 (1998-08-01), Jobin et al.
patent: 36 02 625 C1 (1987-03-01), None

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