JPH0678829A - Ascending/descending device for cabinet - Google Patents

Abstract

PURPOSE:To provide the ascending/descending device for a cabinet, which is arranged between the cabinet and the wall surface, can be covered with the cabinet at the time of being housed, and can protrude the cabinet forward from a housing position to the lower part at the time of use. CONSTITUTION:A parallel link mechanism 6 is provided in a square fitting frame 3. By this parallel link mechanism 6, a cabinet 1 is supported in freely ascendable and descendable between the housing position in the upper part and a use position in the front of the lower part. In the inside of the fitting frame 3, a gas damper 7 for offsetting load weight of the cabinet 1 is provided. A wire rope 11 whose one end is connected to the cabinet 1 is used as a power transmission body, it is wound round a movable pulley 12 supported axially by one end of the gas damper 7, and the load weight of the cabinet 1 is supported by the gas damper 7 through the wire rope 11 and the movable pulley 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for a cabinet which is arranged between a cabinet and a wall surface and supports the cabinet so as to be able to move up and down between an upper storage position and a downward use position which extends forward. Regarding

[0002]

2. Description of the Related Art A lifting device of this type is disclosed in, for example, Japanese Patent Laid-Open No.
It is known from Japanese Patent No. 265506. There, a balancing mechanism is constructed by using a constant force spring unit as an actuation source, and the spring force cancels out the total weight of the cabinet, facilitating the lifting operation. Specifically, a winding pulley is fixed to the output shaft of the constant load spring unit, and the cabinet is suspended and supported by the metal tape wound around the pulley. The cabinet is guided and supported by a pair of guide rails fixed to the wall surface in order to prevent wobbling during lifting. Further, a security mechanism is provided on the output shaft so as to mitigate the sudden rise and stop impact of the cabinet. Although the constant load spring unit is a kind of spiral spring, it has a feature that it can always output a constant spring force regardless of the withdrawal stroke of the spring plate.

[0003]

SUMMARY OF THE INVENTION In the above lifting device,
For example, when a cabinet arranged on a wall surface is to be supported, an elevating device is arranged above the cabinet and a guide rail is fixed to the wall surface. In such a usage form, the guide rail is exposed on the lower wall surface of the cabinet in the stored state, and the appearance is bad. The lifting device at the top of the cabinet also contributes to the harmony of the room. In particular, when the cabinet is pushed forward from the upper storage position to the lower front, the guide rail must be projected from the wall surface, which is not only bad in appearance but also obstructs the guide rail. When the cabinet is arranged on the wall surface near the ceiling, the installation space for the lifting device may not be secured.

The balance mechanism using the constant load spring unit as an operation source is advantageous in that it outputs a substantially constant balance force, but it has a disadvantage that it is difficult to cope with variations in load weight. For example, when the applied load becomes small, the acceleration when the cabinet rises increases, which in turn causes a large stopping impact, and the components housed inside are scattered. In order to avoid such a situation, a safety mechanism including a ratchet mechanism and a brake mechanism is indispensable in the conventional device, and the structure is complicated and the cost is increased accordingly.

An object of the present invention is to obtain a lifting device for a cabinet which is arranged on the back surface of the cabinet and can be covered with the cabinet when stored, and which is thin and which does not hinder the harmony of the room. is there. Another object of the present invention is to eliminate the need to use an extra mechanism such as a ratchet mechanism or a brake mechanism even when the load is changed, and to stop the cabinet ascending / descending speed within a speed range that does not hinder the structure. It is to obtain a lifting device for a cabinet that is simple and reduces the manufacturing cost. Another object of the present invention is to provide a balance mechanism using a gas damper in which pressurized gas is enclosed as an operation source, which can be used without any trouble even when the lifting stroke of the cabinet greatly exceeds the withdrawal stroke of the gas damper. To get the lifting device.

[0006]

The lifting device of the present invention comprises:
The cabinet 1 is attached to the rectangular mounting frame 3
A parallel link mechanism 6 that supports up and down between an upper storage position that covers the outer surface of the cabinet and a use position that extends downward and forward from the storage position, and a balance mechanism that cancels the load weight of the cabinet 1. That is, the balancing mechanism includes a pressurized gas-filled gas damper 7 having one end fixed to the mounting frame 3, and a movable pulley 12 pivotally supported on the other end of the gas damper 7.
And a transmission 11 having one end fixed to the cabinet 1 and the other end fixed to the mounting frame 3 with the middle part thereof being wound around the movable pulley 12, and when the cabinet 1 descends, The requirement is that the transmission 7 is wound around the movable pulley 12 in the direction in which the extension length of the damper 7 decreases.

Specifically, the gas damper 7 is obliquely arranged along the diagonal line of the mounting frame 3, and the deflection pulleys 13, 14, 15 for guiding the transmission body 11 to the movable pulley 12 are transferred.
Is provided on the mounting frame 3. A wire rope can be applied to the transmission body 11, and either the transmission body 11 and the mounting frame 3 or the transmission body 11 and the cabinet 1 can be provided with the cabinet 1
A load adjusting mechanism 24 that changes the extension length of the gas damper 7 and changes and adjusts the initial operation of the gas damper 7 when the gas damper 7 is in the storage position is provided.

[0008]

In the stored state, the parallel link mechanism 6 constituting the lifting device is folded inside the mounting frame 3, and the balance mechanism is housed in the mounting frame 3. The mounting frame 3 is covered with the cabinet 1 and the inside thereof cannot be visually observed. In this way, the lifting device is installed in the cabinet 1 in the stored state.
By adopting the form of covering up with, it is possible to prevent the harmony of the room from being disturbed by the lifting device.

Gas damper 7 filled with pressurized gas
Urges the piston rod 7c to extend by the internal gas pressure. When a load is applied, the piston rod 7c retreats into the cylinder 7a, and the gas pressure in the compartment on the side pressed by the piston 7b increases at this time, so the pressurized gas passes through the piston 7b and has a small diameter communication passage. It flows from the chamber with high pressure to the chamber with low pressure through 7f. Although the flow velocity of the gas changes depending on the change in the load, the fluctuation range of the moving speed of the piston 7b is small because the cross-sectional area of the communication passage is sufficiently small. This means that the fluctuation range of the extension speed or the retreat speed of the gas damper 7 is small even if the load applied to the cabinet 1 fluctuates, that is, the fluctuation of the ascending / descending speed of the cabinet 1 is kept within a speed range that does not hinder. This means that it is possible to eliminate the rapid movement and stop impact of the cabinet 1 by utilizing the operating characteristics of the gas damper 7 itself.

When the gas damper 7 is arranged along the diagonal line of the mounting frame 3, its extension stroke can be set large. Further, when the movable pulley 12 is pivotally supported on one end of the gas damper 7 and the midway portion of the transmission body 11 is wound around the movable pulley 12, the movable pulley 12 exhibits a function equivalent to that of a moving pulley. Even when the stroke of the damper 7 is greatly exceeded, it can be dealt with without any trouble.

[0011]

According to the present invention, the quadrangular mounting frame 3, the balancing mechanism using the gas damper 7 provided therein as a power source, and the parallel link mechanism 6 constitute an elevating device, and in the stored state, The entire lifting device is covered with the cabinet 1. Therefore, it is possible to improve the appearance in the use state and to prevent the harmony in the room from being disturbed by the lifting device. Since the cabinet 1 is moved up and down between the storage position and the use position where the parallel link mechanism 6 pushes the storage position downward and forward, for example, even if furniture or a workbench is installed below the cabinet 1. Therefore, articles can be easily put in and taken out of the cabinet 1 without being disturbed by them. Lifting device is cabinet 1 and wall 2
Since it is placed between the upper and lower parts of the cabinet 1, it is not necessary to secure an installation space, and it can be installed at an arbitrary position on the wall surface compared to the conventional lifting device, and there is almost no restriction on the installation space. Is.

Since the balancing mechanism is constructed by using the gas damper 7 as an operation source, even if the load load of the cabinet 1 varies, the gas damper 7 alone can utilize the shock absorbing action to prevent the speed variation of the cabinet 1. Can fit in no speed range. Therefore, compared with the conventional lifting device, the structure of the entire lifting device can be simplified and the manufacturing cost thereof can be reduced. In the housed state, both the parallel link mechanism 6 and the balance mechanism are housed in the mounting frame 3, which is also advantageous in that the overall shape of the lifting device can be made thin.

Regarding transmission of the up-and-down movement of the cabinet 1 to the gas damper 7 via the transmission body 11 such as a wire rope, the transmission body 11 is wound so that the movable pulley 12 functions as a moving pulley. Regarding the above, it is advantageous in that the raising / lowering stroke of the cabinet 1 can be set up to twice the stroke of the gas damper 7, and even if the raising / lowering stroke of the cabinet 1 is large, it is possible to cope with it without any trouble.

[0014]

In FIG. 5, reference numeral 1 is a cabinet, 2 is a wall surface, and an elevating device is arranged between the both. As shown in FIG. 2, the lifting device includes a mounting frame 3 assembled in a square shape, and brackets 4 fixed to both lower corners of the mounting frame 3.
5, a parallel link mechanism 6 having one end connected to it, a balance mechanism using a pressurized gas-filled gas damper 7 as an operation source, and the like.

The parallel link mechanism 6 is composed of a pair of left and right links, each including a lower link 6a and an upper link 6b, and a mounting bracket 9 for loading the cabinet 1 on the swinging ends of the upper and lower links 6a and 6b. Set up. A stopper 10 is provided on the outer surface of the mounting bracket 9 so as to contact the lower link 6a and define the lower limit of the parallel link mechanism 6 (see FIG. 5). By supporting the cabinet 1 with the parallel link mechanism 6, the cabinet 1 is in a storage position where the cabinet 1 covers the outer surface of the mounting frame 3 (state shown in phantom in FIG. 5).
It is possible to move up and down between the storage position and the use position (solid line state in FIG. 5) which is pushed forward and downward from the storage position. In the storage position, the links 6a and 6b are vertically folded into the opening surface of the mounting frame 3, and the cabinet 1 contacts the outer surface of the mounting frame 3.

A balance mechanism is provided to gently lower the cabinet 1 and move it up more smoothly. In FIG. 2, the balance mechanism includes two gas dampers 7 arranged in parallel along a diagonal line of the mounting frame 3 and having one end fixed to the bracket 4 described above, and a wire for transmitting the vertical movement of the cabinet 1 to the gas damper 7. Rope (transmission body)
11, the two movable pulleys 12, 12 pivotally supported on the free end of the gas damper 7, and three deflection pulleys 13, 14, 15 for deflecting and guiding the wire rope 11.

The gas damper 7 is a commercial product, and is composed of a cylinder 7a, a piston 7b, a piston rod 7c, and fittings 7d and 7e fixed to the ends of the cylinder 7a and the piston rod 7c, as shown in FIG. Has been done.
High-pressure nitrogen gas is sealed inside the cylinder 7a, and an operating force in a direction in which the piston rod 7c extends is always output due to the pressure difference between the inside and the outside of the cylinder. Piston 7
A small-diameter communication passage 7f that communicates the compartments partitioned by the piston 7b is provided in b. When the piston 7b moves, the pressure in the compartment in front of the moving direction increases,
Since the gas flows into the other compartment via the communication passage 7f,
The gas pressures in both compartments are balanced at the storage position and the use position. The operating force of the gas damper 7 takes a minimum value in the maximum extension state, and gradually increases as the piston rod 7c retracts into the cylinder 7a. By utilizing this, the initial operating force of the gas damper 7 can be changed.

As shown in FIG. 4, the two movable pulleys 12 and 12 are rotatably supported by the pulley shafts 16 mounted on the fixtures 7e of the piston rods 7c, and the shafts are supported by collars. is there. 3 deflection pulleys 13 and 14
15 is attached to the vertical frame 23 fixed to the left and right central portions of the mounting frame 3 via holders 17, 18, and 19, respectively. Specifically, the deflection pulley 13 is fixed to the upper outer surface of the mounting frame 3 by the holder 17, and the deflection pulley 14 is mounted by the holder 18.
Is fixed to the inner surface of the central portion of the (see FIG. 3), and the deflection pulley 15 is fixed to the outer surface of the central portion of the mounting frame 3 by the holder 19 in an inclined posture. As a result, the deflection pulley 13 idles around the left and right horizontal axes, and the deflection pulley 14 idles around the front and rear horizontal axes.
The deflection pulley 15 idles around an axis orthogonal to the tilt axis of the gas damper 7.

The wire rope 11 is wound around each of the pulleys 12 to 15 as follows to amplify the stroke of the gas damper 7. One end of the wire rope 11 is connected and fixed to the back wall of the cabinet 1 via a stopper 21 (see FIG. 5), and a middle portion thereof is deflected by a deflection pulley 13 and a deflection pulley 14.
And is guided in the direction along the tilt axis of the gas damper 7. Further, after the wire rope 11 is wound around one of the movable pulleys 12, it is wound around the deflection pulley 15 located between the pair of gas dampers 7 and reversed, and is wound around the remaining movable pulleys 12. The end of the wire rope 11 extending from the movable pulley 12 is fixed to the bracket 4.

When the piston rod 7c of the gas damper 7 is displaced back and forth, the pair of movable pulleys 12 move together with the piston rod 7c to function as a moving pulley. Therefore,
The lifting stroke of the cabinet 1 can be set to an arbitrary amount within a range that does not exceed four times the stroke of the gas damper 7. In FIG. 2, the front surface of the mounting frame 3 excluding the operation area of the parallel link mechanism 6 is covered with a convex cover 21.
Although not shown, a plurality of places of the mounting frame 3 are fixed to the wall surface 2 with bolts. In FIG. 5, reference numeral 22 is an operation handle.

According to the lifting device configured as described above,
The cabinet 1 can be moved up and down between a storage position and a use position that is pushed forward and downward from the storage position. In the use position, the user can easily take in and out the articles stored in the cabinet 1 in a natural posture. be able to. When the cabinet 1 is in the storage position, the gas damper 7 is in the extended state. When the operation handle 22 is grasped from this state and the cabinet 1 is pulled down and operated, the cabinet 1 follows the trajectory defined by the parallel link mechanism 6 and descends while pushing out while maintaining the upright posture.

With the lowering of the cabinet 1, the wire rope 11 is pulled out from the mounting frame 3 by the amount of the lowering. At this time, the tension acting on the wire rope 11 is borne by the pair of gas dampers 7 via the movable pulley 12. As described above, the gas damper 7 constantly outputs an operating force due to the pressure of the pressurized gas inside, and when the retreat speed of the piston rod 7c exceeds a certain value, the compression reaction force of the pressurized gas. In response to this, the operating force is further increased. Therefore, the cabinet 1 slowly descends due to the velocity impact action of the gas damper 7 itself, and does not move rapidly or cause a large stop impact at the end of the descending stroke. Even when the operating force of the user or the load weight of the cabinet 1 varies, the descent speed can be slowly lowered for the same reason, although there is a slight difference in the descent speed.

In the use position, the parallel link mechanism 6 bears a part of the weight of the cabinet 1 loaded. In this state, if the maximum load weight of the cabinet 1 is set so that the tension acting on the wire rope 11 slightly exceeds the operating force of the gas damper 7, the cabinet 1 will naturally rise by the operating force of the gas damper 7. Can be stopped. In this case, when the cabinet 1 is returned to the storage position, if the cabinet 1 is pushed down to the midpoint of the rising stroke, the cabinet 1 automatically returns to the storage position thereafter.

As described above, the two movable pulleys 12 each function as a moving pulley. Therefore, the stroke of the gas damper 7 is smaller than the stroke of the wire rope 11, and only a part of the stroke is used,
Alternatively, a small gas damper 7 with a smaller stroke can be used. When there is a margin in the withdrawal stroke, the initial operating force of the gas damper 7 can be changed and adjusted by changing the fixed position of the wire rope 11 on the bracket 4.

The lifting device of the present invention can adopt the following embodiments other than the above-mentioned basic embodiment.
A decorative wall that completely covers the outer peripheral surface of the mounting frame 3 is provided on the periphery of the back wall of the cabinet 1 to prevent the mounting frame 3 from being seen from the outside in the storage position. Between the parallel link mechanism 6 and the mounting bracket 9, in the use position, the vertical link 6a
A lock mechanism that automatically engages with at least one of 6b to prevent displacement of the upper and lower links 6a and 6b is provided, and the position of the cabinet 1 pulled down to the use position can be maintained. In this case, a lever or button for unlocking the lock mechanism is provided near the operation handle 22. As shown in the principle explanatory view of FIG. 1, the gas damper 7 can be arranged in a substantially vertical portrait orientation. As the transmission body 11, a strip-shaped material such as stainless tape can be used in addition to the wire rope. The cylinder 7a
In the case of using the gas damper 7 having the lubricating oil built therein, the cylinder 7a is attached to a dedicated bracket provided at the upper corner of the attachment frame 3.

FIG. 7 shows an embodiment of the load adjusting mechanism 24 for changing and adjusting the initial operating force of the gas damper 7. This is because the adjustment shaft 25 made of a pipe material is fixed to the bracket 4 with an adjustment nut 26, and a ball catch type wire fixture 27 is installed inside the shaft protruding end of the adjustment shaft 25. Fix one end of 11. When the fixed position of the adjusting shaft 25 is changed by operating the adjusting nut 26, the movable pulley 12 is moved according to the amount of displacement.
Since the position of is changed, the initial power of the gas damper 7 can be changed.

A bracket dedicated to the gas damper 7 is provided,
Even if the mounting position of the bracket with respect to the mounting frame 3 can be changed, the initial operating force of the gas damper 7 can be changed in the same manner as described above.

It is preferable that one end of the gas damper 7 is fixed to the bracket 4, and then the vertical frame 23 is utilized as shown in FIG. Specifically, the cylinder 7 is provided on both side walls 23a of the vertical frame 23.
The cylinder 7a is pressed and fixed by the holding metal fitting 29 which receives the peripheral surface of a and is fixed together with the holder 18 for the deflection pulley 14.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of a lifting device according to the present invention.

FIG. 2 is a front view of a lifting device.

3 is a cross-sectional view taken along the line AA in FIG.

4 is an enlarged view of part B in FIG.

FIG. 5 is a vertical sectional side view showing an operating state of the lifting device.

FIG. 6 is a cross-sectional view schematically showing the structure of a gas damper.

FIG. 7 is a cross-sectional view showing a load adjusting mechanism.

FIG. 8 is a cross-sectional view showing another embodiment of the mounting form of the gas damper.

[Explanation of symbols]

 1 Cabinet 2 Wall Surface 3 Mounting Frame 6 Parallel Link Mechanism 7 Gas Damper 11 Transmission Body (Wire Rope) 12 Movable Pulley 13 ・ 14 ・ 15 Deflection Pulley

Claims (3)

[Claims] 1. A parallel link for supporting a cabinet 1 on a quadrangular mounting frame 3 so as to be vertically movable between an upper storage position where the cabinet 1 covers the outer surface of the mounting frame 3 and a use position where the cabinet 1 extends downward and forward from the storage position. A mechanism 6 and a balance mechanism for canceling the load weight of the cabinet 1 are provided. The balance mechanism includes a gas damper 7 of a pressurized gas sealed type with one end fixed to the mounting frame 3, and a gas damper 7 other than the gas damper 7. The cabinet includes a movable pulley 12 rotatably supported at the end, and a transmission body 11 having one end fixed to the cabinet 1 and the other end fixed to the mounting frame 3 in a state where the midway portion is wound around the movable pulley 12, An elevating device for a cabinet in which the transmission 7 is wound around the movable pulley 12 in a direction in which the extension length of the gas damper 7 decreases when 1 is lowered. 2. A gas damper (7) is obliquely arranged along a diagonal line of the mounting frame (3), and deflection pulleys (13, 14, 15) for guiding the transmission body (11) to a movable pulley (12) are provided on the mounting frame (3). A lifting device for a cabinet according to claim 1. 3. The gas damper in which the transmission body 11 is made of a wire rope, and the cabinet 1 is located at the storage position on either one of the transmission body 11 and the mounting frame 3, or between the transmission body 11 and the cabinet 1. The load adjusting mechanism 24 for changing the extension length of 7 and changing and adjusting the initial operation thereof.
An elevating device for a cabinet according to claim 1 or 2, further comprising: