JPH10203792A - Underfloor elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily realize correspondence to an uneven load by elevating and operating an underfloor storage main body in a stable and horizontal state. SOLUTION: This device is furnished with an elevating frame 1 to support elevation of an underfloor storage main body, one each of rotary shafts 2 is provided on each of both end sides of the elevating frame 1, a sprocket pair 3 made of two pieces of sprockets is arranged on each of these two rotary shafts, and an electric motor 4 is connected to one of there rotary shafts. Thereafter, each of chain pairs 5 made of two chains each upper and lower ends of which are fixed is extended to be seen an they cross with each other between two piece of the sprockets 31 positioned on the same side in two sets of the sprocket pairs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor elevating device. More specifically, the present invention relates to an underfloor elevating device that can operate to elevate and lower an underfloor storage main body in a stable horizontal state and easily cope with uneven loads.

[0002]

2. Description of the Related Art Conventionally, it has been considered to reduce the burden on an operator by lowering the main body of an underfloor storage provided under the floor of a house or the like, so that the main body can be moved up and down between the floor and the floor. Some underfloor storages are available on the market. This vertically movable storage room is generally provided with a lifting mechanism on the side or bottom surface of a frame suspended from the floor opening, and the storage body is moved from below the floor to above the floor by a driving mechanism such as an electric motor or a hydraulic cylinder. A lifting device is provided.

[0003]

However, in the underfloor storage, it is often the case that stored items are stored unevenly inside the main body, so that the main body can be raised and lowered in a stable horizontal state. However, it is urgently necessary for the lifting device to cope with uneven loads.
Guides and the like require considerable rigidity and special design, and it is not easy to cope with uneven loads. In addition, there are many parts, and it is difficult to change the stroke (operating length), and it is difficult to automatically open and close the lid.

The present invention has been made in view of the above circumstances, and solves the drawbacks of the conventional lifting device used for the underfloor storage, thereby raising and lowering the underfloor storage body in a stable horizontal state. It is another object of the present invention to provide an underfloor elevating device capable of easily realizing an uneven load.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided with an elevating frame for assisting the elevating of the underfloor storage main body, and one rotating shaft is provided at each end of the elevating frame. And a pair of sprockets is provided on each of these two rotating shafts,
An electric motor is connected to one of the rotating shafts, and each of a pair of chains having upper and lower ends as fixed ends is connected between two sprockets located on the same side by two sets of sprocket pairs. Underfloor elevating device, characterized in that the chains are stretched so as to cross each other.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The underfloor elevating device of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a perspective view schematically showing an example of the underfloor elevating device of the present invention. As shown in FIG. 1, the underfloor elevating device according to the present invention is provided with an elevating frame (1) for supporting the elevating and lowering of the underfloor storage main body for storing articles, and the elevating frame (1) is provided at both ends. Are provided with one rotating shaft (2). A pair of sprockets (3) is provided on each of these two rotating shafts (2). The two sprockets (31) constituting the sprocket pair (3) are provided on the rotating shaft (2) so as to rotate in the same direction at the same speed. An electric motor (4) serving as a drive source of the underfloor elevating device is connected to one rotating shaft (2).

A pair of chains (5) having fixed upper and lower ends is provided, and each of these chains (5) is a pair of two sprocket pairs (3) located on the same side. As shown in FIG. 1, the two chains (5) are stretched between the sprockets (31) so that the two chains (5) appear to cross each other when viewed from the front side and the back side of the sprocket (31). .

In the underfloor elevating device of the present invention, as shown in FIG. 1, two sets of sprockets (3) for one rotating shaft (3) are provided on both sides of the elevating frame (1), for example, at four corners. Can be provided. In this case, two pairs of chains (5) can be provided for each pair of sprocket pairs (3) arranged on the same side with respect to the lifting frame (1). That is, two chains (5) can be provided. These two chains (5)
Then, as for the set, as described above, each of the two sets of chains (5) has two sprocket pairs (3) and two sprockets (31) located on the same side.
In between, the two chains (5) are stretched so that they appear to cross each other.

The underfloor elevating device according to the present invention has a structure shown in FIG.
As shown, the upper and lower frames (6,
7) are separated from each other by a predetermined distance, connected to each other by a hanging frame (8), and the lifting frame (1) can be disposed between these upper and lower frames (6, 7) so as to be able to move up and down. In this case, the upper end and the lower end of the chain (5) are connected to the upper frame (6) and the lower frame (7), respectively, and can be fixed ends.

For example, in the underfloor elevating device of the present invention having the above structure, when the electric motor (4) operates, the rotary shaft (2) to which the electric motor (4) is connected rotates, and is provided on the rotary shaft (2). The rotational force is transmitted to the two sprockets (31) of the sprocket pair (3). This rotational force is generated by a pair of chains (5).
The other sprocket pair (3) has two sprockets (3
It is transmitted to another rotating shaft (2) via 1). These two rotating shafts (2) are a set of two chains (5).
As a result, the lifting frame (1) moves up and down while maintaining the horizontal state, as shown in FIG. Even if the stored items are stored unevenly in the storage main body that supports the elevation, the elevation of the storage main body is a stable operation.
The rigidity of the frame, guides, and the like, which are required to cope with uneven loads in the conventional underfloor storage that can be moved up and down, and special designs are eliminated. Correspondence to uneven load is easily realized.

In particular, as shown in FIG. 1, when the sprocket pairs (3) are arranged at appropriate portions such as four corners on both sides of the lifting frame (1), a more stable lifting frame (1) is provided. A lifting operation is obtained. In addition, underfloor storage used under conditions where offset load is not so severe, for example,
The underfloor elevating device shown in FIG. 3 can be employed.

In the underfloor elevating device shown in FIG. 3, one set of two sprockets (3) is provided for one rotating shaft (2).
And each pair of chains (5) is
2 sprockets (31) located on the same side in two sets of sprocket pairs (3), similar to the underfloor elevating device shown in FIG.
In between, the two chains (3) are stretched so that they appear to cross each other. The arrangement position of the sprocket pair (3) is preferably on the center line of the lifting frame (1) or in the vicinity thereof in order to surely cope with an uneven load.

As described above, the underfloor elevating device according to the present invention comprises:
A compact configuration is also possible. FIG. 4 is a main part perspective view showing another example of the underfloor elevating device of the present invention. In FIG. 4, the sprocket and the chain are partially omitted in order to clearly show the configuration. However, the underfloor elevating device shown in FIG. 4 is exactly the same as the underfloor elevating device shown in FIG. 1. A sprocket pair (3) and a chain (5) are provided.

In the underfloor elevating device shown in FIG. 4, the lid of the underfloor storage can be automatically opened and closed in conjunction with the elevating of the main body to improve convenience. That is, in the underfloor elevating device shown in FIG. 4, the end of the lid (10) of the underfloor storage, which is rotatable with respect to the floor surface (9) and can be freely opened and closed, on the side of the rotating shaft (11). Is connected to the upper end of the chain (5). Although not shown in FIG. 4, in this underfloor elevating device, each chain (5)
When the lifting frame (1) is at the lower end as shown in FIG. 4A, a tension relieving means is provided to prevent tension from acting.

As the tension reducing means, for example, a chain slightly longer than the stroke of the lifting frame (1) is exemplified. By adopting this chain for each chain (5), the chain (5) is provided with the tension reducing means. In addition, a spring having an appropriate spring constant can be used as the tension relieving means. In this case, the spring connects in the middle of each chain (5).

For example, the underfloor elevating device shown in FIG. 4 having the above configuration operates as follows. As shown in FIG. 4A, when the lifting frame (1) is at the lower end, the lifting frame (1) is supported by the lower frame (7), and each chain (5) is supported by the tension relieving means. Is not under tension.

When a rotational force is applied to one of the rotary shafts (2) by the electric motor (4) shown in FIG. 1, this rotational force is transmitted to the sprocket (31) of the sprocket pair (3) and the chain (5). ) Winding starts. Each chain (5) is subjected to a pulling force due to the weight of the storage body and the lifting frame (1), and also the weight of the storage items stored in the storage body. Due to this pulling force, a rotational moment is generated in the lid body (10) in a direction in which the lid body (10) opens about the rotation axis (11). As a result, FIG.
As shown in <b>, the lid (10) rotates with respect to the floor surface (9) and starts the opening operation.

The required pulling force of the chain (5) for generating the rotational moment is equivalent to the lifting frame (1).
Is much smaller than the force required for lifting and lowering, so that the lifting frame (1) is completely opened by the lid (10).
It does not rise until it stands up as shown in FIG. 3 <c>. After the lid (10) is in the upright state, the tension of the chain (5) enables the pulling force to generate a rotational moment for maintaining the upright state of the lid (10) and the lifting of the lifting frame (1). Becomes equal to the resultant force with the pulling force. Thus, the lifting operation of the lifting frame (1) in a state where the lid (10) is completely opened is realized.

When the lifting / lowering frame (1) moves downward, the lid (1) is in the middle of the downward movement in the same manner as during the upward movement.
The standing state of 0) is stably maintained by the rotational moment in the opening direction generated by the pulling force of the chain (5) due to the weight of the storage main body, the lifting frame (1), and the like.
When the lifting frame (1) reaches the lower end shown in FIG. 4A and is supported by the lower frame (7), the tension of the chain (5) decreases. The tension at this time is
0) is not enough to generate a rotational moment that can be maintained in an upright state. For this reason, the lid (10) is rotated and closed by its own weight by a rotational moment in the closing direction about the rotation axis (11).

As described above, the underfloor elevating device of the present invention comprises:
Automatic opening and closing of the lid (10) in conjunction with the elevation of the elevating frame (1) can be easily realized without providing a special mechanism. In the case of the underfloor elevating device shown in FIG. 4, the lid (10) may be of a single-opening type or a double-opening type. In the case of the one-sided lid (10), the lid (1
The upper end of the chain (5) located on the end (ie, the rotating end) opposite to the rotating shaft (11) of (0) is, for example, the upper frame (6) shown in FIG. And so on.

The underfloor elevating device shown in FIG. 3 may be applied to such an underfloor elevating device capable of automatically opening and closing the lid. In this case, the chain (5) whose upper end is located on the rotation shaft (11) side of the pair of chains (5).
May be connected at the upper end to the end of the lid (10) on the rotation axis (11) side. FIG. 5 is a perspective view of an essential part showing still another example of the underfloor elevating device according to the present invention.

The underfloor elevating device shown in FIG. 5 is applied to an underfloor storage provided with a double-opening lid (10). In this underfloor elevating device, as shown in FIG. 5A, each of the four chains (5) in the underfloor elevating device shown in FIG.
Is connected to a rotating end of a lid (10) which can be rotated and opened and closed freely. The storage main body (12) can be placed on the lifting frame (1).

When the storage main body (12) is lifted by such an underfloor elevating device, as shown in FIG. 5B, first, the lid (10) is manually moved to the rotating shaft (11). To open. Then, it is held upright by a lock mechanism (13) attached to the underfloor storage to prevent the lid from falling. At this time, the four chains (5)
It is stretched straight from the lower frame (7) to the rotating end of the lid (10) arranged above the floor surface (9).

In this state, when the electric motor (4) shown in FIG. 1 is operated, as shown in FIG. 5 <c>, the lifting frame (1) exceeds the floor surface (9) and further rises above the floor surface (9). It is possible to ascend to the rotation end of the lid (10). In the underfloor elevating device shown in FIG. 5, the stroke of the elevating frame (1) is extended to the length of the lid (10) of the underfloor storage when placed upright with respect to the floor (9). ing.

As described above, the underfloor elevating device of the present invention comprises:
The change of the stroke of the lifting frame (1) can be easily realized without providing a special mechanism. Of course, the present invention is not limited by the above examples. It goes without saying that various aspects are possible for details such as the configuration and structure of the electric motor, the frame and the chain.

[0026]

As described above in detail, according to the present invention, even if the stored items are stored unevenly, the underfloor storage main body can be moved up and down in a stable horizontal state. It is easy to cope with uneven loads, and the cost of the underfloor elevating device and the underfloor storage can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an example of an underfloor elevating device according to the present invention.

FIG. 2 is a perspective view of a main part illustrating an ascending and descending state of the underfloor elevating device shown in FIG. 1;

FIG. 3 is a perspective view of an essential part schematically showing another example of the underfloor elevating device according to the present invention.

FIGS. 4A and 4B are main part perspective views schematically showing another example of the underfloor elevating device and the opening operation of the lid, respectively, of the present invention.

FIGS. 5A and 5B are main part perspective views schematically showing another example of the underfloor elevating device and the opening operation of the lid, respectively, of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevating frame 2 Rotating shaft 3 Sprocket pair 31 Sprocket 4 Electric motor 5 Chain 6 Upper frame 7 Lower frame 8 Hanging frame 9 Floor 10 Cover 11 Rotating shaft 12 Storage body 13 Lock mechanism

Claims (8)

[Claims] 1. A lifting frame for supporting lifting and lowering of an underfloor storage main body, wherein a rotating shaft is provided at both ends of the lifting frame.
A pair of sprockets is provided for each of the two rotating shafts, and an electric motor is connected to one of the rotating shafts, and the upper and lower ends are fixed ends. The underfloor elevating device wherein each of the set of chains is stretched between two sprockets located on the same side by two sets of sprocket pairs so that the two chains appear to cross each other. apparatus. 2. Two pairs of sprockets are provided on each side of the lifting frame for one rotating shaft, and each of two pairs of four chains is composed of two pairs of sprockets arranged on the same side with respect to the lifting frame. The underfloor elevating device according to claim 1, wherein two chains of one set are stretched so as to intersect each other between two sprockets located on the same side. 3. A pair of sprockets is provided for one rotating shaft, and each pair of two chains is connected between two sprockets located on the same side of the two pairs of sprockets. The underfloor elevating device according to claim 1, wherein the chains are stretched so as to cross each other. 4. An upper frame and a lower frame, which are spaced apart from each other by a predetermined distance, are connected by a suspension frame, and an elevating frame is arranged between the upper and lower frames so as to be able to move up and down. A frame and a lower frame are connected to each other.
The underfloor elevating device according to any one of the above. 5. An upper end of a chain is connected to an end of the underfloor storage lid, which is rotatable with respect to the floor surface and can be freely opened and closed, on the rotation shaft side, and a lifting frame is attached to each chain. The underfloor elevating device according to any one of claims 1 to 4, further comprising tension relaxation means for preventing tension from acting when at the lower end, and enabling automatic opening and closing of the lid in conjunction with elevating the elevating frame. 6. The underfloor elevating device according to claim 5, wherein each chain is longer than a stroke of the elevating frame as the tension relieving means. 7. The underfloor elevating device according to claim 5, wherein the tension relieving means is a spring, and the spring is connected to the middle of each chain. 8. An upper end of a chain is connected to a rotating end of a double-opening type underfloor storage lid which is rotatable with respect to the floor and can be freely opened and closed, and the stroke of the lifting frame is adjusted to the floor. The underfloor elevating device according to any one of claims 1 to 4, wherein the length of the lid is up to the length of the lid when the lid is placed upright.