Hydraulic circuit for a patient handling apparatus

A patient handling apparatus comprising:

• a patient support surface;
• a base;
• a hydraulic circuit including a pump, a fluid reservoir, and a hydraulic cylinder operable to selectively raise or lower the patient support surface or the base relative to the other of the patient support surface or the base, and the hydraulic circuit operable to control flow of hydraulic fluid between the hydraulic cylinder and the fluid reservoir;
• and
• wherein the hydraulic circuit includes a manual bypass circuit configured to selectively bypass the pump yet maintain fluid communication between the hydraulic cylinder and the fluid reservoir to allow manual operation of the hydraulic cylinder, wherein the manual bypass circuit includes a single manually operable valve assembly that is operable to selectively bypass the pump and to provide fluid communication between the hydraulic cylinder and the fluid reservoir.

A patient handling apparatus comprising:

• a patient support surface;
• a base;
• and
• a hydraulic circuit including a pump, a fluid reservoir, and a hydraulic cylinder operable to selectively raise or lower the patient support surface or the base relative to the other of the patient support surface or the base, and the hydraulic circuit operable to control flow of hydraulic fluid between the hydraulic cylinder and the fluid reservoir,
• wherein the hydraulic circuit includes a manual bypass circuit configured to selectively bypass the pump yet maintain fluid communication between the hydraulic cylinder and the fluid reservoir to allow manual operation of the hydraulic cylinder, and
• wherein the hydraulic circuit includes an accumulator in fluid communication with the fluid reservoir to maintain pressure of the hydraulic fluid in the hydraulic circuit.