Motors: expansible chamber type – Position maintaining type
Patent
1987-02-26
1988-07-05
Nilson, Robert G.
Motors: expansible chamber type
Position maintaining type
F15B 13042
Patent
active
047546921
ABSTRACT:
A fluid control system of this invention is constituted by a controller and a cylinder (21). The controller comprises: for example, a box (4) having a first chamber (18) having a fixed volume to which a fluid is supplied from a fluid pressure generating source and a second chamber (19) of a variable volume which is connected to a cylinder port (29), such chambers (18) and (19) communicating with each other by a fluid passage (2); a casing (8) engaged with the box (4) for relative movement in the direction of action of a load and having a fluid discharging passage (15) communicating with said second chamber (19) of said box (4); and a valve (5) arranged so that fluid passages (2, 3) respectively between the first chamber (18) and the second chamber (19) and between the second chamber (9) and the fluid discharging passage (15) are closed in the case of no application of a load or an external force while they get into different states in the case of application thereof. The control automatically detects the load, and the fluid modulated to a pressure matched with the detected load is supplied to the cylinder port (29), thereby maintaining the balance of forces with respect to the load. This invention enable the provision of load transfer apparatus or pressure applying apparatus in which the manufacturing cost is further low, the operation is safe and easy and the energy consumption is further low.
REFERENCES:
patent: 3428298 (1969-02-01), Powell
patent: 3621756 (1971-11-01), Ulbing
patent: 3894476 (1975-07-01), Cobb
Hitachi Juki Sekkei Co.
Nilson Robert G.
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