Expansible chamber devices – With cushioning means effective over a portion only of stroke
Reexamination Certificate
2005-12-05
2008-01-29
Lopez, F. Daniel (Department: 3745)
Expansible chamber devices
With cushioning means effective over a portion only of stroke
C092S249000, C277S436000
Reexamination Certificate
active
07322272
ABSTRACT:
A piston for a fluid operated power cylinder has two mutually coaxial sealing lips axially extending away from each other and being able to radially yield, for sealing engagement with the piston running face of the power cylinder and adjacent to at least one piston end side an elastic buffer body serving for shock absorbing in the end of stroke position of the piston, said body having an impact face facing away from the piston. At least at one piston end face the sealing lip itself constitutes the buffer body and has the impact face at its end, groove-like recesses being formed on the inner periphery of the sealing lip with a distribution in the peripheral direction, such recesses opening toward said impact face.
REFERENCES:
patent: 1478561 (1923-12-01), Faessel
patent: 2902828 (1959-09-01), Felt
patent: 3176595 (1965-04-01), Schwartz
patent: 3913460 (1975-10-01), Wright
patent: 24 07 989 (1982-08-01), None
patent: 199 25 083 (2000-12-01), None
patent: 201 01 49 (2001-05-01), None
Festo AG & Co.
Hoffmann & Baron , LLP
Lopez F. Daniel
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