Pipe joints or couplings – Essential catch
Reexamination Certificate
2000-07-17
2001-10-30
Nicholson, Eric K. (Department: 3627)
Pipe joints or couplings
Essential catch
C285S321000, C285S902000, C285S340000, C285S308000
Reexamination Certificate
active
06308995
ABSTRACT:
The invention relates to a quick release coupling device according to preamble of claim
1
and a device for establishing of quick release coupling.
Known are coupling systems that formlockingly connect with each annular flanges, which are provided on a separate hollow bodies, with screws or stirrupt bolts. The drawback of these systems consists in that a substantial time is required for screwing and unscrewing of a plurality of screws. Further, bayonet joints are also known. Those consist of an annular flange with recesses formed in its circumference and an annular mating flange with projections which engage in the recesses. A formlocking connection between separate hollow bodies is established by rotation of the hollow bodies in opposite direction by a width of one recess. The drawbacks here are high manufacturing costs and a need to rotate the hollow body or a separate ring about a rotational axis. Also, systems with toothed segments are also known which are pushed, from inside or from outside, in corresponding grooves in the hollow bodies with wedges or control rings. (White, U.S. Pat. No. 4,832,976, Rexroth, DE 1,475,128, Klepper, DE 717229, Sulzer, EPO-513466A1, Nippone Steel DE 3,932,225A1). Other solutions are based on radially displaceable clamp segments (Babcock, DE 1,050,139, Uhde, EPO 093878, ABB W093.19311, Udhe, DE 4,102,622A1, Unteco, DE 3,721,942A1).
These systems have a number of expensive and awkward parts which, in addition, do not correspond to a need for cleanness. Also are known couplings in which an elastically deformable ring is used as a force transmitting member. Those can have a cross-section of a round rod (R. Bosch, FR 2,678,027A3, Messerschmitt-Bolkow-Blom, DT 2,623,937A1, of a clamp (Scholz, DE 3,421907C1) or of a flat bar (General Descaling, EP 0129 349A2, Mondo, CH 525 415). Though round rods are very cost-effective and occupy less space, they are suitable only for small loads as the bearing surfaces are not uniformly loaded. In a U-shaped clamp, the transmitted forces cause bending stresses, so that the cross-section should be large, and the expanding mechanism should be correspondingly strong. Besides, the elastically deformable force transmitting elements do not insure safety against an undersized opening (Uhde, DE 4,102,662,A1).
It is also known to provide a pressure vessel and a cover with a device which can be relatively quickly secured and released in order to close or open the vessel. Such a device is disclosed in DE-A 39 32 225. This device includes an annular groove formed on the inner side of the vessel, a projection formed on the cover, and a plurality of holding segment-like elements which are put together to form a holding ring and which absorb forces generated by the inner pressure to force—or formlockingly connect the vessel parts. The drawback of this device consists in that it is designed for holding a cover.
The invention, as characterized in the claims, solves the object of improving the connection.
The advantages achieved by the invention consists in that a formlocking connection is rapidly established with simple and cost-effective means, and the requirements with respect to safety and ease of cleaning are met.
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Nicholson Eric K.
Sidley Austin Brown & Wood LLP
Simson Innovationen
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