Hydraulic circuit for linearly driving a movable...

Details Hydraulic circuit for linearly driving a movable... Hydraulic circuit for linearly driving a movable...

2007-12-25

2007-12-25

Banks, Derris H. (Department: 3725)

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

C072S175000

Reexamination Certificate

active

10483833

ABSTRACT:
A hydraulic circuit for linearly driving a movable roller-holder slider of a pipe bending machine, comprising a hydraulic cylinder (5) whose piston rod is connected to a slider holding a movable roller, the cylinder being fed with pressurized fluid from a reservoir (16) by a pump (15), through a three-position four-way valve (18), a check valve (12, 13) and an interposed throttling valve (19), that is operated to generate an increased pressure in said low pressure chamber of the hydraulic cylinder (5) in order to slow down the slider holding the upper roller in its primary motion when a programmable interval is reached from said predetermined position for each working pass.

REFERENCES:
patent: 2494984 (1950-01-01), Bauer
patent: 3180124 (1965-04-01), Robra
patent: 4918958 (1990-04-01), Glomb et al.
patent: 6173598 (2001-01-01), Caporusso et al.
patent: 22 57 368 (1974-06-01), None
patent: 197 51 504 (1998-07-01), None

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