A - Human Necessities – 61 – G
Patent
A - Human Necessities
61
G
138/62
A61G 7/00 (2006.01) A61G 7/012 (2006.01) A61G 7/018 (2006.01) F15B 1/027 (2006.01) F15B 13/042 (2006.01)
Patent
CA 1308626
ABSTRACT OF THE DISCLOSURE A hydraulic actuating unit for raising a hospital bed includes a reser- voir, a hydraulic piston cylinder device the cylinder of which has its ends con-nected to the reservoir through a supply conduit that contains a hydraulic plunger pump with suction and pressure valve means and through a return conduit which contains an orifice in a normally closed relief valve. A branch conduit leads to a hydraulic liquid accumulator from the supply conduit at a location between the cylinder and pressure valve means. A multiple pilot op- erated check valve of the differential type is provided in the branch conduit to- wards the accumulator. The largest and smallest end faces of the differential spool member are subject to the pressure in the branch conduit while the dif- ferential area of the spool member is subject to the pressure in a conduit whichleads from the return conduit at a location between the orifice and the relief valve. The pressure in the branch conduit to the accumulator tends to cause the spool member and the check valve to open while the pressure in the return conduit tends to move the spool member into a closed position.
603276
Oudelaar Tone
Schmale Fred W.
Applied Power Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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