JPS6259565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that effectively prevents furniture from falling forward due to vibrations such as earthquakes.

Generally, when an earthquake occurs, large box-shaped furniture without any anti-vibration measures vibrates back and forth as shown in Figure 3, and when the vibration becomes large, the drawers may extend forward or the doors may close. If the furniture opens forward, the center of gravity will move significantly forward, causing the furniture to tilt forward.

Therefore, in order to reliably prevent the furniture from tipping over, it is preferable to fix the furniture to the wall using appropriate fixing fittings, but if the wall is made of concrete or earth, it is not easy to fix the furniture. In addition, the fixing work is complicated and looks unsightly, so it is very rare for furniture users to proactively use fixing fittings to fix furniture.

Therefore, the present invention is normally stored inside a furniture frame in a state that is completely invisible from the outside, and when an earthquake occurs and the furniture vibrates, the front end of the furniture is automatically lifted according to the degree of vibration. The main purpose of this invention is to provide a device that automatically prevents furniture from tipping forward with an extremely simple structure and at low cost.

The details of the present invention will be described below based on the embodiments shown in the drawings.

A pair of hydraulic cylinders 3, each equipped with a piston 1 and a piston rod 2, with the piston rod 2 extending downward, are vertically attached to the inner surface of the front wall 15 of the furniture frame A. Said piston 1
is constantly pressed downward by the spring 4. Therefore, No. 5 is a cylinder upper chamber 3A and a cylinder lower chamber 3B divided by the piston.
A check valve (one-way valve) 6 is interposed in the middle of the hydraulic circuit, and the check valve allows oil to flow from the lower cylinder chamber 3B to the upper chamber 3A and prevents the reverse flow. It is configured. Further, reference numeral 7 is a bypass circuit connecting the cylinder 3A and the lower chamber 3B, and a manual on-off valve 8 that is manually opened and closed is interposed in the bypass circuit. Manual locking means 9 are also provided for locking and releasing the movement of the piston and the piston rod connected thereto. In the embodiment shown in the figure, the manual locking means is formed by a locking manual on-off valve 10 disposed in the middle of the hydraulic circuit 5.

In addition, the manual on-off valve 8 and the lock manual on-off valve 1
0 are holes 11 and 12 penetrating the front wall 15 of the furniture frame
It is designed so that it can be operated by inserting appropriate tools.

In the figure, reference numeral 13 indicates a base plate pivotally attached to the lower end of the piston rod, and reference numeral 14 indicates a hole cover.

In the above configuration, when the locking manual on-off valve 10 is opened after the furniture is placed in a predetermined position, the piston 1 is moved downward by the pressing force of the spring (in this case, the manual on-off valve 8 of the bypass circuit is closed). Then, the piston rod stops at the position where the base plate 13 at the lower end touches the floor surface B. In this case, the cylinder lower chamber 3B is opened only toward the cylinder upper chamber 3A through the check valve 6, so that the cylinder rod is pressed by the force of the spring 4 and can always move downward. If an earthquake were to occur in such a state, the furniture would vibrate back and forth as shown in Figure 3, but if the front end of the furniture lifts even a little due to this vibration, the lifting load on the piston rod will be removed, so the lifting force will be reduced. The piston rod will move downward. Due to this lowering, the weight of the furniture is applied to the piston rod, but the check valve 6 prevents the oil from flowing back into the lower cylinder chamber 3A, so the piston 1 cannot move upward.
The furniture is therefore held with the front end raised, ie tilted back.

If you want to return the furniture to its original position after the earthquake subsides, operate the manual on-off valve 8 to open the bypass circuit, and the upper and lower chambers of the cylinder will communicate, allowing the piston to rise and returning the furniture to its original position. can be restored to.

As described above, according to the present invention, if the front end of the furniture lifts even a little due to the vibration of the furniture due to an earthquake, the piston rod will sequentially protrude downward by the amount of the lift, changing the posture of the furniture to a backward position, that is, the position of the room. By keeping the furniture leaning against the wall, this prevents the furniture from tipping forward due to the forward leaning of the drawer or the natural opening of the door. Since the members are housed inside the furniture frame, they have great effects such as not damaging the appearance of the furniture. Furthermore, in the present invention, after the furniture is installed, when the front end of the furniture is lifted by hand by releasing the manual locking means, the piston rod is moved down by the amount of lifting, similar to the case of the furniture vibration described above. It is possible to easily correct the forward leaning posture and left/right balance of furniture without having to perform complicated work such as fitting wedges or floor plates into the underside of the front end of the furniture, and therefore it can also be used as a balancer for adjusting the posture of furniture in normal times. effective.

In the present invention, the manual locking means may be configured to mechanically lock and release the cylinder rod, for example, with a lock pin, instead of the above-mentioned manual locking valve 10, and these configurations are also included in the present invention. It is included in

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a sectional view showing the operating state, and FIG. 3 is an explanatory diagram showing the vibration state of furniture at the time of an earthquake. 1...Piston, 2...Piston rod, 3...Hydraulic cylinder, 3A...Cylinder upper chamber, 3B...Cylinder lower chamber, 4...Spring, 5...Hydraulic circuit, 6
...Check valve, 7. Bypass circuit, 8. Manual on-off valve, 9. Manual lock means, 10. Lock on-off valve.

Claims (1)

[Scope of Claims] 1. At least a pair of hydraulic cylinders equipped with a piston and a piston rod, with the piston rod extending downward, are installed vertically at both ends of the front part inside the furniture frame, and the piston is always connected to a spring. A hydraulic circuit with a check valve interposed between the cylinder upper chamber and a cylinder lower chamber separated by the piston, and a bypass circuit with a manual on-off valve interposed between the cylinder upper chamber and the cylinder lower chamber separated by the piston are provided. . The furniture tilting prevention device, wherein the check valve is configured to allow oil to flow from the lower cylinder chamber to the upper chamber and prevent the reverse flow, and further includes a manual lock mechanism for locking and releasing the movement of the piston rod. 2. The furniture tilting prevention device according to item 1, wherein a through hole is provided in the front wall of the furniture frame, and the manual lock mechanism and manual on-off valve are operated through the through hole.