Expansible chamber devices – Piston – Open-ended hollow skirt type
Reexamination Certificate
1999-11-16
2001-07-17
Ryznic, John E. (Department: 3745)
Expansible chamber devices
Piston
Open-ended hollow skirt type
Reexamination Certificate
active
06260473
ABSTRACT:
The invention relates to a piston to be mounted, as defined in the introductory part of claim
1
. Such a piston is known from DE-OS 34 26 238.
FIG. 2
of the present patent document shows that the two connecting screws are arranged in the thrust/counter thrust direction. This type of construction is successfully employed in connection with certain highly stressed diesel engines such as, for example engines for locomotives or yachts.
However, the drawback of two-screw pistons lies in the fact that as compared to multi-screw pistons, stiffer screws have to be used, while the initial preclamping force is nonetheless lower.
Therefore, the invention is dealing with the problem of increasing in connection with a piston with a screw arrangement the total initial thrust force substantially in the thrust/counter thrust direction, thereby permitting the use of screws with higher elasticity.
The invention provides a piston with a thrust side and a counter thrust side. The piston comprises a top component and a bottom component joined together by two sets of screws. One set of screws is located on the thrust side and the second set of screws is located on the counter-thrust side. Further provided is a common pressure member connected to each set of screws.
By using two screws each on the pressure side and on the counter pressure side, said screws being arranged closely to each other in pairs, a higher initial pressure force is achieved and thus greater safety against mass force. The minimum spacing between the center axes of a screw arranged on the pressure side, and a screw arranged on the counter pressure side amounts in this connection to 50% of the diameter of the piston.
Furthermore, higher safety against loosening is obtained because screws with higher elasticity can be used.
The pressure members have a distinctly simpler structure than the pressure elements customarily employed. For example, the pressure members can be designed in the form of simple round plates with two bores, such plates abutting plane support surfaces of the interior of the piston.
REFERENCES:
patent: 1293846 (1919-02-01), Marmon
patent: 1331573 (1920-03-01), McKechnie et al.
patent: 1377438 (1921-05-01), Ricardo
patent: 2104347 (1938-01-01), Larkin
patent: 2464554 (1949-03-01), Bushby
patent: 3323503 (1967-06-01), Grosshans et al.
patent: 4084553 (1978-04-01), Forde et al.
patent: 34 26 238 (1986-01-01), None
patent: 35 27 812 (1987-02-01), None
patent: 44 16 120 (1995-11-01), None
patent: 0 237 853 (1987-09-01), None
patent: 384458 (1932-12-01), None
patent: 1 099 296 (1968-01-01), None
Barth Alois
Fuchs Reinhold
Messmer Dieter
Collard & Roe P.C.
Mahle GmbH
Ryznic John E.
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