JP2001197962A - Hydraulic device which vertically moves bed under horizontal state - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and light-weight device without requiring a parallel moving mechanism in order to keep the bed surface horizontal, in a vertically moving type bed. SOLUTION: A double acting type hydraulic cylinder is used as the legs of a bed, and a piping connection is performed in such a manner that the piston moving amounts of the double acting type hydraulic cylinders may become equal. Thus, the vertical moving of the bed under a horizontal state is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home bed or a medical bed.

[0002]

2. Description of the Related Art A conventional elevating bed requires a complicated link mechanism for elevating the bed in parallel while keeping the bedding surface horizontal.

[0003]

The conventional parallel movement mechanism is a large-scale one which is installed at the lower part of the bedding surface, has a large weight, and prevents the use of the lower part of the bed as a storage part. The present invention has been devised to eliminate these disadvantages.

[0004]

According to the present invention, the structure of the bed is simplified by directly extending and retracting all the legs of the bed by a double-acting hydraulic cylinder, and the bed is hydraulically connected to extend and contract by an equal distance. It is. By connecting the lower oil chamber of one hydraulic cylinder to the upper oil chamber of the next hydraulic cylinder and connecting all the cylinders in the same manner in order, all the cylinders expand and contract by the same distance, and the bedding The surface is kept horizontal. The horizontal movement of the bedding surface is ensured by the double-acting hydraulic cylinders connected in this manner, so that the power for raising and lowering the bedding surface may be human power or mechanical power.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings.
FIG. 1 shows the entire bed and shows a state in which four double-acting hydraulic cylinders 11 are arranged at four corners as legs of the bed. The piston rod 3 moves in and out to adjust the height of the bed. In FIG. 1, the illustration of the hydraulic pipe 10 is omitted. FIG. 3 shows a cross-sectional view of one double-acting hydraulic cylinder 11. The upper oil chamber 5 and the lower oil chamber 6 have the same effective sectional area, and the sum of the volumes of the upper oil chamber 5 and the lower oil chamber 6 is constant regardless of the position of the piston 2.

FIG. 2 shows all of these double-acting hydraulic cylinders 1.
1 shows the connection state. One double-acting hydraulic cylinder 11
The lower oil chamber 6 and the upper oil chamber 5 of the adjacent double-acting hydraulic cylinder 11 are connected by a hydraulic pipe 10 and sequentially connected in the same manner. Since the sum of the volumes in the two oil chambers connected by the hydraulic pipe 10 is always constant, when one piston rod 3 moves, the piston rod 3 moves by the same distance in all the double-acting hydraulic cylinders 11. .
Thus, the bedding surface can be moved up and down while always being horizontal.

FIG. 4 shows an example of raising and lowering by a hydraulic pump.

[0008]

According to the present invention, since a parallel moving mechanism is not required, the structure is simplified and the weight can be reduced. The space under the bed is available.

[0009]

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire bed.

FIG. 2 is a schematic view illustrating the principle of the present invention. .

FIG. 3 is a schematic sectional view of a double-acting cylinder.

FIG. 4 is a diagram showing an example of ascending and descending by a hydraulic pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston 3 Piston rod 4 Packing 5 Upper oil chamber 6 Lower oil chamber 7 Mounting part 8 Bedding surface 9 Hydraulic pump 10 Hydraulic pipe 11 Double-acting hydraulic cylinder

Claims (1)

[Claims] 1. A double-acting hydraulic cylinder having an equal effective area is disposed at each of the four corners of a bed, and their piston rods are used as legs for supporting the bed. A hydraulic system that connects to the oil chamber and horizontally raises and lowers the bed that connects all cylinders in the same manner in order.