Bed

• US 3,993,051 A
• Filed: 01/26/1976
• Issued: 11/23/1976
• Est. Priority Date: 02/08/1975
• Status: Expired due to Term

• Current Assignee: Shinjiro Maruyama
• Original Assignee: Shinjiro Maruyama
• Inventors: Maruyama, Shinjiro
• Primary Examiner(s): Gilliam, Paul R.
• Assistant Examiner(s): Calvert, Andrew M.
• Application Number:
  US05/652,457
• Time in Patent Office: 302 Days
• Field of Search: 5/62, 5/64, 5/66, 5/365, 5/327, 272/98, 248/188.2, 128/24 R, 128/70
• US Class Current: 601/5
• CPC Class Codes: A47C 19/045 with entire frame height or inclination adjustments
• CPC Class Codes: A61G 7/002 having adjustable mattress frame

Abstract

The invention provides a bed which, when an individual lies down upon it, allows him to take the "Yoga Slant Position" -- with the head lower than the feet -- through its automatic tilting operation, which gently returns the bed to its normal horizontal position after a short time. The bed is supported by a pair of hydraulic support means disposed respectively at the front and rear section, each oil chamber of the hydraulic support means being connected to an oil chamber of an oil tank which is provided separately, via a variable throttle valve.

Claims

1. A bed comprising the combination of;

a bed frame;

a base;

a pair of hydraulic support means disposed respectively at the front and rear section of said base, each of said hydraulic support means consisting essentially of a cylinder erected vertically on said base, a piston incorporated in said cylinder, an oil chamber defined below said piston, and a piston rod the upper end of which is connected to said front or said rear section of said base;

an oil tank including a separator capable of displacement inside an airtight vessel erected on said base so as to divide it into an oil chamber and a compressed air chamber while maintaining airtightness; and

a pair of pipes, each being equipped with a variable throttle valve and connecting said oil chamber of said oil tank to the bottom of each oil chamber of said hydraulic support means.

2. The bed as defined in claim 1 wherein said bed frame is connected to said base by a pantagrahic link mechanism such that said bed frame maintains a parallel relationship with said base in a plane perpendicular to the longitudinal direction of said bed frame.

3. The bed as defined in claim 1 wherein said oil chamber of said oil tank is connected by pipes to said oil chamber of said hydraulic means at the position of an intermediate height on the same plane, each of said pipes provided with a variable throttle valve.

4. The bed as defined in claim 3 including:

a manual switch valve provided on each said pipes connecting said oil chamber of said oil tank to said oil chamber of said hydraulic support means;

said cylinder being erected on said base, and having a piston defining an oil chamber at the lower portion thereof and a compressed air chamber at the upper portion;

a pipe connecting the bottom of said oil chamber of said piston to the bottom of said oil chamber of said oil tank via a variable throttle valve; and

link means connecting said manual switch valve to the upper end of said piston rod penetrating slidably and in as airtight condition through said cylinder in a fashion such that when said piston reaches a predetermined height, said manual switch valve is caused to open by the action of said link means.

5. The bed as defined in claim 1 further comprising:

a main body constituting said bed frame;

a moving frame constituting said bed frame jointly with said main body and moving back and forth thereabove;

a plurality of springs connecting said main body to said moving frame;

at least one stopper member disposed on the upper surface of said main body; and

at least one pin member disposed on the lower surface of said moving frame to engage with said stopper member, either said stopper member or said pin member being displacable back and forth.

6. The bed as defined in claim 1 wherein the inlet of said pump is connected to said oil chamber of said oil tank and the outlet of said pump is connected to each oil chamber of said hydraulic support means via a check valve that allows oil to flow only from said pump to said oil chamber of said hydraulic support means.