Title: Piston structure, particularly for hydraulic machines

Abstract: The piston is formed with a piston head and a sleeve, fitted together such that the piston head has an outer end diameter matching the diameter of the cylinder, and then is formed with an offset inwardly extending shoulder, against which the piston sleeve can bear, to permit machining of the inner face of the piston head to form a bearing cup for a spherical head of a piston rod, and then assembly of the piston sleeve to bear against the abutment; drain line and oil connection lines may be formed in the piston to lead lubricating oil to the bearing cup. The piston head and sleeve can be connected by adhesives and, if necessary, tangentially located transverse pins.

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Inventors: Guntert, Karl (Oensingen, CH)

Application Number: 449286
Filing Date: 1974-03-08
Publication_date: 1976-01-06
Assignee: Von Roll AG (Gerlafingen, CH)
Primary Class(es): 92/160 91/488, 92/106, 92/172, 92/187, 92/255, 403/379.5
Other Classes:
US Patent Ref:

1216218	Feb, 1917	Eddowes	403/379.
2066802	Jan, 1937	Rowntree et al.	92/224.
2077688	Apr, 1937	Gottlieb	92/224.
2141935	Dec, 1938	Rose	91/488.
2974636	Mar, 1961	Farmer	92/255.
3073254	Jan, 1963	Hoover	91/488.
3172340	Mar, 1965	Blenkle	92/181.
3173376	Mar, 1965	Hulman et al.	91/488.
3183786	May, 1965	Defo, Jr.	92/169.
3343460	Sep, 1967	Jones	92/168.
3474710	Oct, 1969	Stryker	92/164.

Other Refs: 820,245551,362

Nov, 1951	DT
Feb, 1943	UK

Primary Examiner: Cohen, Irwin C.
Assistant Examiner:
Attorney: Flynn & Frishauf