Hydraulic system for laundry flatwork ironer
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United States of America Patent
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-
Nov 13, 1990
Grant Date -
N/A
app pub date -
Oct 11, 1988
filing date -
Oct 11, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic system for operating the rollers and one or more steam chests in a laundry flatwork ironer. A two-way, variable delivery, high pressure, main pump operates a hydraulic motor driving the ironer rollers. A one-way, fixed delivery, charge pump keeps the hydraulic circuit between the main pump and the hydraulic motor fully charged. The charge pump also powers a hydraulic control circuit for the main pump and controls the operation of steam chest lift cylinders. The control circuit for the main pump has a positioning cylinder and a speed control cylinder which jointly control the direction and delivery rate of the main pump, thereby controlling the direction and speed of the ironer rollers. The control circuit has a solenoid valve for stopping the hydraulic motor in an emergency and a solenoid valve for selectively controlling the speed of the chest lift cylinders.
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