JP2003093174A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator which can smoothly ascend and descend regardless of variation of weight of articles to be contained in the elevator. SOLUTION: The center terminal part of a spiral spring 22 is fixed to a rotary shaft 21 to which a rear support link 17 constituting one side of parallel support links is rotatably fixed. A trident stopper 36 rotatable centering on a shaft 37 is attached under the spiral spring 22. An operating lever 46 is rotatably connected via a shaft 45 to a support part 44. The stopper 36 is moved to a position of the solid line, the two-dot chain line, or the broken line by adjusting a position of the operating lever 46 drawn out from the frame body 27. Thus an engaged position of the engaging part 51 on the outer end part of the spiral spring 22 is varied to change resiliency by the spiral spring 22 transmitted to the rear support link 17 via the rotary shaft 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device,
In particular, the present invention relates to an elevating device used for elevating shelves in kitchens, shoe boxes at entrances, and the like.

[0002]

2. Description of the Related Art FIG. 5 is a front view showing an external shape of a lifting device used as a conventional kitchen lifting rack, and FIG. 6 is a sectional view taken along line VI-VI shown in FIG.

With reference to these figures, an elevating shelf 13 also having an open front is housed inside a box-shaped storage case 14 having an open front. A parallel support link including a front support link 16a and a rear support link 17a is attached to the left side surface of the elevating shelf 13 via a mounting plate 18. Similarly, a parallel support link including a front support link 16b and a rear support link 17b is attached to the right side surface of the elevating shelf 13.

The lower end portion of the front support link 16a is attached to the side surface of the mechanism box 20 so as to be rotatable about the rotation shaft 33. On the other hand, the lower portion of the rear support link 17a is rotatably centered on the rotary shaft 21.
It is attached to the 0 side. The rotary shaft 21 is inserted into the mechanism box 20, and the spiral spring 61 is attached to the rotary shaft 21 inside the mechanism box 20.

A shaft 29 is attached to the lower end of the rear support link 17a. The shaft 29 is inserted into the mechanism box 20 and one end of the oil damper 25 is connected thereto. The other end of the oil damper 25 is connected to a predetermined position inside the mechanism box 20.

Since the lifting device 11 is configured in this manner, the lifting shelf 13 is stored in the storage case 1 as indicated by an arrow.
It is possible to pull out to the lower front while keeping the horizontal state with respect to 4. As a result, it becomes easy to store and take out articles from the elevating shelf 13. When the elevating shelf 13 is lifted rearward and upward as shown by the arrow when the storage of the articles is completed, the elevating shelf 13 is stored in the storage case 14.

Here, the oil damper 25 is used for the lifting shelf 13.
It is provided in order to suppress abrupt movement during the raising and lowering operation of the.

On the other hand, the spiral spring 61 is provided to reduce the force required to move up and down the lift shelf 13. Therefore, the detailed structure of the spiral spring 61 will be described with reference to FIG. 7.

FIG. 7 is an enlarged view of the mounting portion of the spiral spring shown in FIG.

Referring to the figure, the center end of a spiral spring 61 is fixed to a rotary shaft 21 attached to a rear support link 17a and inserted through the inside of a mechanism box 20.
The outer end portion of the spiral spring 61 is bent as an engaging portion 62, and is fixed to the side surface of the mechanism box 20.
Engage 3. That is, at the position where the engaging portion 62 is engaged with the pin 63, the movement in the clockwise direction is already blocked.

When the elevating shelf 13 is pulled down to the front lower side, the rear support link 17a rotates clockwise around the rotation shaft 21. Therefore, the rotary shaft 21 also rotates clockwise in the same manner. As a result, the spiral spring 6
The inner end of 1 is rotated clockwise, and the spiral spring 61 generates a counterclockwise rotational force as a repulsive force with respect to the rotary shaft 21.

In other words, the spiral spring 61 produces a resistance force when the rear support link 17a is rotated clockwise. Therefore, with respect to the weight of the lifting shelf 13 itself and the weight of the articles stored inside the lifting shelf 13, the lifting shelf 1
The force applied to the rear support link 17a when pulling down 3 is offset and reduced. Further, the repulsive force of the spiral spring 61 also works to reduce the force required when the elevating shelf 13 is housed in the housing case 14 from the state of being pulled out forward and downward. This makes it possible to smoothly move up and down the elevating shelf 13.

[0013]

The conventional lifting device as described above has no particular problem when the weight of the articles stored in the lifting rack is constant. However, in general, the weight of the items to be stored often varies. Therefore, if the repulsive force of the spiral spring is constant, the lifting / lowering operation of the lifting / lowering shelves becomes too light or heavy, and smooth lifting / lowering of the lifting / lowering shelves tends to be difficult.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a lifting device capable of smoothly moving up and down regardless of a change in weight of articles stored in a lifting shelf. And

[0015]

In order to achieve the above object, the invention according to claim 1 is characterized in that the elevating shelf is moved forward from the storage case by a parallel support link attached to the elevating shelf stored in the storage case. An elevating device that is movable downward, and a spiral spring whose center end is fixed to a rotation shaft of at least one of the support links of the parallel support link,
And a spring adjusting means capable of changing the engaging position of the spiral spring with respect to the outer end portion to two or more positions.

With this structure, the repulsive force of the spiral spring is adjusted in at least three stages.

According to a second aspect of the present invention, in the structure of the first aspect of the invention, the spring adjusting means is rotatable about an axis and extends outward from the axis to form a spiral spring at each end thereof. It includes a stopper including a first branch portion and a second branch portion having engaging pins that can be engaged with each other, and an operation lever that is connected to the stopper and that is rotatable about an axis of the stopper.

With this structure, the engaging position of the spiral spring changes according to the position of the operating lever.

According to a third aspect of the invention, in the configuration of the second aspect of the invention, the stopper includes a support portion extending further outward from the shaft, and the operation lever is connected to an end portion of the support portion. Is.

According to this structure, the rotation of the stopper is controlled by the position of the operation lever via the support portion.

According to a fourth aspect of the present invention, in the configuration of the third aspect of the invention, the first branch portion, the second branch portion and the support portion are arranged in a three-pronged shape around the axis, and the first position of the support portion is provided. In, the end portion of the first branch portion engages with the spiral spring, and at the second position of the support portion, neither the first branch portion nor the second branch portion engages with the spiral spring, and In the third position, the end of the second branch engages the spiral spring.

According to this structure, the engagement state of the stopper with the spiral spring changes according to the position of the support portion.

According to a fifth aspect of the present invention, in the structure of the fourth aspect of the invention, the operating lever is such that the support portion moves from the first position to the third position via the second position. Is attached to the tension spring, and three notches for preventing the movement of the operation lever are formed against the biasing force of the tension spring. Each of the notches is a frame in which the spiral spring is stored. It detachably engages with a part of the body.

With this structure, the operation lever can be moved easily and the movement stopped state can be stabilized.

According to a sixth aspect of the present invention, in the structure according to any one of the first to fifth aspects, a second spiral spring whose center end is further fixed to the rotary shaft is provided. The outer end of the mounted, second spiral spring engages a pin that is fixed in position.

With this configuration, the types of repulsive force applied to the support link increase.

[0027]

As described above, according to the first aspect of the present invention, since the repulsive force of the spiral spring can be adjusted in at least three steps, the adjustment range according to the weight of the articles stored in the elevating shelf can be adjusted. It can be expanded and raised and lowered more smoothly, improving usability.

According to a second aspect of the invention, in addition to the effect of the first aspect of the invention, since the engaging position of the operating spring changes according to the position of the stopper, the repulsion of the spiral spring can be achieved only by operating the operating lever. It becomes easy to select the force.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, since the operation lever is connected to a support portion independent of the first branch portion and the second branch portion, the arrangement of the stopper is arranged. Will be easier.

According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, since the engagement state between the stopper and the spiral spring changes according to the position of the supporting portion, the repulsive force of the spiral spring is increased. Control is stable.

In addition to the effect of the invention described in claim 4, the invention described in claim 5 facilitates the movement of the operation lever and stabilizes the movement stopped state, so that the spiral spring can be easily adjusted and the usability is improved. To do.

According to the invention of claim 6, in addition to the effect of the invention of any one of claims 1 to 5, the number of types of repulsive force applied to the support link is increased, so that the invention is more detailed. It becomes easy to adjust the repulsive force to the support link.

[0033]

1 is a sectional view showing a schematic structure of a lifting device according to a first embodiment of the present invention, and corresponds to the sectional view of FIG. 6 shown in a conventional example.

Referring to the drawing, the elevating device 11 comprises a box-shaped storage case 14 whose front is opened, and a box-shaped elevating shelf 13 which is housed inside the storage case 14 and whose front is opened. The elevating shelf 13 is movable up and down in the direction indicated by the arrow in the figure.

A front support link 16 and a rear support link 17 forming a parallel support link are attached to the left side surface of the elevating shelf 13. Specifically, the upper end portion of the front support link 16 has an attachment plate 18 fixed to the side surface of the elevating shelf 13.
Is rotatably connected via a shaft 34. The lower end portion of the front support link 16 is attached to the side surface of the frame body 27 forming the mechanism box 20 so as to be rotatable around the rotation shaft 33.

On the other hand, the upper end of the rear support link 17 is connected to the mounting plate 18 so as to be rotatable around a shaft 28. The lower portion of the rear support link 17 is attached so as to be rotatable around a rotation shaft 21, and the rotation shaft 21 is attached to the frame body 2.
It is attached in a state of penetrating the side surface of 7 and being inserted into the inside thereof. Further, with respect to the rotary shaft 21 inside the frame 27, as will be described later, the spiral spring 22 and the spiral spring 2 are provided.
3 is attached.

Further, the lower end portion of the rear support link 17 has the shaft 2
It is attached so as to be rotatable around 9 and the shaft 29
Is in a state of penetrating the frame 27 and being inserted inside. Inside the frame 27, the lower end of the oil damper 25 is rotatably attached to the shaft 29. On the other hand, the upper end of the oil damper 25 is rotatably connected to a shaft 30 fixed to the frame 27.

A spring adjusting device 26, which will be described later, is attached inside the frame 27 below the spiral spring 22 and the spiral spring 23.

With the elevating device 11 thus constructed, the elevating shelf 13 housed in the housing case 14 as shown by the arrow moves up and down in a horizontal state.

FIG. 2 is a view showing the detailed structure of the spring adjusting device shown in FIG. 1, and the description of the oil damper 25 shown in FIG. 1 is omitted. 3 is a cross-sectional view taken along the line III-III shown in FIG.
FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 2.

With reference to these figures, two spiral springs 22 and 23 are attached in parallel to a rotary shaft 21 inserted in the frame 27. The center end of the spiral spring 23 is fixed to the rotating shaft 21, and the outer end of the spiral spring 23 is configured to engage with a pin (not shown) fixed inside the frame 27. ing.

A stopper 36, which is rotatable about a shaft 37, is attached diagonally below the spiral spring 22. The stopper 36 is configured such that the two plates are arranged at a predetermined interval via the engagement pin 39, the engagement pin 42, and the shaft 45. Each of the parallel plates is arranged in a three-pronged shape, extends in one direction around the shaft 37, and has a first branch portion 38 to which an engaging pin 39 is attached at the tip thereof, and another plate around the shaft 37. A second branch portion 41 extending in a direction and having an engaging pin 42 attached to its tip, and a support portion 44 extending in another direction around the shaft 37 and having a shaft 45 attached to its tip. ing.

One end of a rod-shaped operating lever 46 is rotatably connected to the shaft 45 of the stopper 36. Further, a tension spring 49 is provided in the opening 50 at the center of the operation lever 46.
The lower end of is attached. The upper end of the tension spring 49 is attached to the pin 53 on the side surface of the frame body 27.
Further, saw-shaped notches 47a to 47c are provided at three positions on the other end side of the operating lever 46. Notch 47a
Any one of to 47c is configured to engage with the opening 48 engaged with the front surface of the frame body 27 depending on the position of the operation lever 46. Spring adjusting device 2 as spring adjusting means
6 is composed of such a stopper 36 and an operating lever 46.

On the other hand, the outer end of the spiral spring 22 whose center end is fixed to the rotary shaft 21 inside the frame 27 is bent as shown in the figure to form the engaging portion 51, and Drive shaft 21
The engaging portion 51 moves along the one-dot chain line circular orbit along with the rotation.

Next, a usage state of the spring adjusting device 26 will be described.

First, in the first position shown by the solid line, the engaging pin 42 of the stopper 36 is engaged with the engaging portion 5 of the spiral spring 22.
The stopper 36 rotates about the shaft 37 so that the stopper 36 is positioned on the movement path of 1. That is, the operating lever 46 is pulled out from the frame 27 to the maximum position, and the notch 47 a engages with the opening 48 of the frame 27 at this position. In this state, the lower end of the tension spring 49 moves to the frame body 27 side, so that the spring 49 is in an extended state and urges the operation lever 46 to the left in FIG.

In this way, the operation lever 46 is fixed by the engagement of the notch 47 with the opening 48 and the tensile force of the tension spring 49, and the stopper 36 stops at the position indicated by the solid line. As a result, the engaging portion 51 of the spiral spring 22 engages with the engaging pin 42 of the stopper 36. When the elevating shelf 13 is pulled down from the storage case 14 in this state, the rear support link 17 rotates together with the rotating shaft 21 in the clockwise direction. As a result, a large counterclockwise repulsive force is generated from the spiral spring 22.

That is, the spring adjusting device 2 is placed in the first position.
By adjusting 6, the repulsive force applied to the rear support link is the sum of the one due to the spiral spring 22 and the one due to the spiral spring 23. Therefore, even when a heavy object is stored in the lift shelf 13, the lift shelf 13 can be smoothly moved up and down.

Next, the engagement state of the operating lever 46 with respect to the opening 48 is released, and the bent portion 52 is operated to engage the second notch 47b with the opening 48. This position is the second position of the spring adjusting device 26 shown by the chain double-dashed line. At this position, the engaging pin 39 and the engaging pin 4 of the stopper 36
Each of the two moves to a position deviated from the orbit of the engaging portion 51 of the spiral spring 22. Therefore, since the engaging portion 51 of the spiral spring 22 does not enter the engaged state at any position,
The repulsive force generated by the spiral spring 22 does not occur, and only the repulsive force from the spiral spring 23 is transmitted to the rear support link 17 via the rotary shaft 21. That is, this state is appropriate when the articles stored in the elevating shelf 13 are the lightest.

When the notch 47b is disengaged from the opening 48 and the bent portion 52 is operated to engage the notch 47c at the tip of the operating lever 46 with the opening 48 of the frame 27, The spring adjusting device 26 is in the third position shown by the broken line.
At this position, the engagement pin 39 of the stopper 36 is
The spiral spring 22 is positioned on the orbit of the engaging portion 51 of the spiral spring 22, and engages with the engaging portion 51 as the spiral spring 22 rotates clockwise.

This engagement position is a position advanced by a predetermined distance in the clockwise direction from the engagement position of the engagement pin 42 at the first position. Therefore, the counterclockwise repulsive force generated in the spiral spring 22 due to the clockwise rotation operation of the rear support link 17 becomes smaller than the repulsive force at the first position. As a result, the repulsive force applied to the rear support link 17 is the sum of the revolving spring 22 and the revolving spring 23. As a result, this third
In the position, the weight of the articles that can be stored in the elevating shelf 13 is suitable for an intermediate weight between the first position and the second position.

By thus providing the spring adjusting device 26 and changing the degree of withdrawal of the operating lever 46 from the frame 27 via the bent portion 52, a spiral spring adapted to the weight of the stored items in the elevating shelf 13. It is possible to easily adjust the repulsive force generated by the coil 22 and the spiral spring 23.

In the above embodiment, the stopper is provided with the support portion, but without providing the support portion, the operation lever is directly rotatable to the first branch portion or the second branch portion of the stopper. It may be configured to be connected.

Further, in the above embodiment, the stopper has a three-pronged shape, but the shape is not limited to this, and other shapes may be used as long as there are at least two engaging points with the spiral spring. Needless to say.

Further, in the above embodiment, the position of the stopper is adjusted and fixed by using the operation lever, but other adjustment and fixing means other than the operation lever may be used.

Further, in the above embodiment, the tension spring is attached to the operating lever, but other biasing means may be used instead of the tension spring.

Further, although the spring adjusting means is attached to the rear support link in the above-mentioned embodiment, it may be attached to the front support link. Alternatively, the spring adjusting means may be attached to both the front support link and the rear support link.

Further, in the above embodiment, the parallel support links are mounted on both sides of the elevating shelf, but it is also possible to mount the parallel support links on only one of them.

Further, in the above-mentioned embodiment, the present invention is applied to the elevating shelf of the kitchen, but it goes without saying that it is also applicable to other elevating devices such as a shoe box at the entrance.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an elevating device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a specific configuration of the spring adjusting device shown in FIG.

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

4 is a cross-sectional view taken along line IV-IV shown in FIG.

FIG. 5 is a front view showing a schematic configuration of a conventional lifting device.

6 is a cross-sectional view taken along line VI-VI shown in FIG.

7 is an enlarged view showing a detailed structure of the spiral spring shown in FIG.

[Explanation of symbols]

11 ... Lifting device 13 ... Lifting shelf 14 ... Storage case 16 ... Front support link 17 ... Rear support link 21 ... Rotation axis 22, 23 ... spiral spring 26 ... Spring adjusting device 27 ... Frame body 36 ... Stopper 37 ... Axis 38 ... First branch 41 ... Second branch 44 ... Supporting part 46 ... Operating lever In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (6)

[Claims] 1. An elevating device capable of moving the elevating shelf forward and downward from the accommodating case by a parallel supporting link attached to the elevating shelf housed in the accommodating case, wherein at least one of the parallel supporting links. Elevating and lowering, which includes a spiral spring whose center end is fixed to the rotation shaft of the support link, and spring adjusting means capable of changing the engaging position of the spiral spring with respect to the outer end to two or more positions. apparatus. 2. The first branch, wherein the spring adjusting means is rotatable about an axis and extends outwardly from the axis and has an engaging pin at each of its ends for engaging with the spiral spring. The lifting device according to claim 1, further comprising: a stopper including a portion and a second branch portion; and an operation lever connected to the stopper and configured to rotate the stopper about the shaft. 3. The lifting device according to claim 2, wherein the stopper includes a support portion that extends further outward from the shaft, and the operation lever is connected to an end portion of the support portion. 4. The first branch portion, the second branch portion, and the support portion are arranged in a trifurcated shape about the axis, and at a first position of the support portion, an end of the first branch portion. A portion of the support portion is engaged with the edge spring, and at the second position of the support portion, neither the first branch portion nor the second branch portion is engaged with the spiral spring; 4. The lifting device according to claim 3, wherein, in the position, the end of the second branch engages the spiral spring. 5. The operation lever is attached with a tension spring for urging the operation lever so that the support portion moves from the first position to the third position via the second position. , Against the biasing force of the tension spring,
The lift according to claim 4, wherein three notches are formed to prevent movement of the operation lever, and each of the notches detachably engages with a part of a frame body in which the spiral spring is stored. apparatus. 6. A second spiral spring, the central end of which is fixed to the rotary shaft, and the outer end of the second spiral spring is fixed at a fixed position. The lifting device according to any one of claims 1 to 5, which engages with.