Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Relatively movable working members of unequal...
Patent
1990-09-19
1991-09-17
Look, Edward K.
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Relatively movable working members of unequal...
60563, 60591, F15B 1100
Patent
active
050483978
ABSTRACT:
The subject invention comprises a hydraulic pressure intensifier (10) including a cylinder (42) having a fluid inlet (44) at one end and a fluid outlet (46) at the other end. Two telescopically disposed pistons (54, 56) are slideably supported between the inlet (44) and outlet (46) ends of the cylidner (42). A spring (60) extending axially through the cylinder (42) urges the pistons (54, 56) toward the inlet end (44) of the cylinder (42). A spring biased valve member (70) seals a flow passage (62) extending through the pistons (54, 56) when the fluid pressure reaches approximately 150 psi at the inlet (44) to the cylinder (42). A pin (68) fixed to the inlet end (44) of the cylinder (42) actuates the valve member (70). The pistons (54, 56) move first in unison and then separately toward the outlet end (46) of the cylinder (42) as the hydraulic pressure increases at the inlet end (44). The valve member (70) includes a frustoconical sealing portion (72) which matingly engages a frustoconically shaped seat surface (64) in the flow passage (62) for full surface-to-surface engagement to positively prevent fluid leakage through the flow passage (62) at elevated pressures.
REFERENCES:
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patent: 3473328 (1969-10-01), Mayhew
patent: 3478518 (1969-11-01), Langerquist
patent: 3857243 (1974-12-01), Douglas
patent: 3942326 (1976-03-01), Hayashida
Denion Thomas
Look Edward K.
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