JPH10265198A - Lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply-constructed, low-cost lift capable of safely and easily adjusting the supported height of an object to be supported that is not so heavy, e.g. a washing bowl. SOLUTION: In a lift in which, of a pair of right and left double pipes 1, 2, the inner pipe 1 is fixed in a vertical position while an object 20 to be supported is supported against the upper end of the outer pipe 2 and the outer pipe is slid relative to the inner pipe in the direction of its axis so as to freely vary the supported height of the object to be supported, a sliding-motion stopping member 9 stopping sliding against the outer surface of the inner pipe is mounted on the inner surface of the outer pipe, and a frictional force produced by the sliding motion stopping member is almost balanced with the total weight of the object to be supported and the outer pipe supporting it. Sliding members 8 are provided on the inner surface of the outer pipe at both the upper and lower ends thereof, a coil spring 10 constantly urging the outer pipe upward is inserted between the lower end of the outer pipe and the fixed part of an inner-pipe lower connecting member 6, and a lock mechanism 7 is provided below the front surface of the wall of the outer pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the height of a workbench or the like, and more particularly, to an elevating apparatus for adjusting the height of a wash basin, for example.

[0002]

2. Description of the Related Art In general, it is desirable that the height of a worktable, for example, the height of a wash basin or a kitchen sink, can be adjusted according to the height of a person who uses it. Otherwise, the user will be forced to take an unreasonable posture, which may lead to various inconveniences in health or efficiency.

Various mechanisms for adjusting the height have been conventionally proposed. For example, those using a worm gear, those using an electric motor, and those using a gas spring are used. These mechanisms are generally capable of lifting and lowering a fairly large weight (100 kg or more), and are often complex and expensive.

However, the frequency at which the height adjustment is actually required is only once at the time of installation, or about several times in total even if the height is adjusted at the transition of a life stage such as the growth of a child or aging. Yes, and the weight to be raised and lowered is more than 10 kg
In some cases, it may be sufficient. In these cases, it is undeniable that any of the conventional height adjustment mechanisms is unnecessarily complicated and expensive.

[0005] Also, as a very simple height adjustment mechanism,
Adjustment bolts may be provided on the bottom of the base. However, the adjusting bolt is inconvenient to handle unless the equipment weight is extremely small. Adjustment bolts often have an insufficient adjustment range.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and low-cost lifting apparatus which can safely and easily adjust the supporting height of a supported object having a small weight such as a washbasin. To provide.

[0007]

The object of the present invention is to fix one of the inner pipe and the outer pipe of a pair of left and right double pipes vertically and to support a supported object at the upper end of the other pipe. In an elevating device that allows the supported height of the supported object to be changed freely by sliding the other tube in the axial direction with respect to one tube, slippage is suppressed in the gap between the outer surface of the inner tube and the inner surface of the outer tube. This problem can be solved by closely interposing the sliding stop member, and substantially balancing the frictional force of the sliding stop member with the total weight of the supported object and the other pipe.

The elevating device (hereinafter referred to as "the product") of the present invention is basically composed of a double tube and a sliding stopper, and one of the double tubes (fixed tube) vertically extends the entire device. The supported object is held at the upper end of the other tube (movable tube) while being held, and the supported object is raised and lowered by sliding the movable tube with respect to the fixed tube. For example, a commercially available steel pipe can be used as the double pipe, and various hard or semi-rigid synthetic resin foams or rubber-based elastic bodies can be used as the sliding stopper. Examples of synthetic resin foams include ester-based or ether-based semi-rigid foamed polyurethane elastomers, and examples of rubber-based elastic bodies include foam-type or solid-type NBR (acrylonitrile-butadiene rubber) -based and HNBR (hydrogenated NBR).
Type, XNBR (carboxyl NBR) type, CR (chloroprene rubber) type, or FKM (fluoro rubber) type elastic body.

The sliding stopper is fixed to the outer surface of the inner tube or the inner surface of the outer tube, and is loaded in a state of being strongly compressed so as to generate a sufficiently large frictional force with a mating surface. The magnitude of the frictional force is determined by the frictional area of the sliding stop member and the degree of compression given during loading. Thus, the total weight of the supported object and the movable tube supporting the same is substantially balanced by being supported by the frictional force of the slide stopping member, and when the supported object is moved to a desired height, the object is stopped at that position. Therefore, there is no danger that the supported object will drop when the lock is released,
In addition, adjustment to a target height can be easily performed at any time without using a special tool or the like.

[0010] One example of the object to be supported by the product is a wash bowl. In this case, the weight of the washbasin itself is at most
Since the weight is about 15 kg, the frictional force by the above-described sliding stop member may be of a size that is approximately balanced with the sum of the frictional force and the weight of the movable tube. However, there are rare cases where people climb or put things on it, so the double pipe as a structural member in this product has sufficient strength (for example, about 150 kg) to withstand such cases. We need to prepare.

The steel pipe, synthetic resin foam and the like used for this product are all inexpensive materials and the structure of the apparatus is simple. Therefore, even if the cost of other parts described later is taken into consideration,
This product can be realized at a considerably lower cost than a conventional height adjustment mechanism. A sufficiently wide adjustment range can be realized by increasing the sliding range of the double pipe, and a sufficiently large weight can be supported by appropriately selecting the thickness and thickness of the double pipe.

It is to be noted that there are two cases where the sliding stop member is attached at the outer surface of the inner tube and the inner surface of the outer tube. When mounted on the inner surface of the outer tube, the friction area of the sliding stop member is relatively small as compared to the opposite case,
On the other hand, the possibility of a straight inner tube with no accessories on the surface is conceivable.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of the present invention,
(1) When the inner tube is fixed and the length of the outer tube sliding on the outer surface is shorter than the length of the inner tube, the inner tube fixed on the upper and lower ends of the outer tube and sliding on the inner surface thereof If the length of the outer tube does not exceed the length of the outer tube, the inner tube at the upper end of the outer tube and the outer surface at the lower end of the inner tube, or the length of the inner tube to which the outer tube is fixed and slides on the inner surface is the outer tube When the length is longer than the length, the above-described lifting and lowering device in which sliding members are provided on the inner surfaces of the upper and lower ends of the outer tube to assist the sliding between the surfaces of the respective ends and the mating surface can be used.

The embodiment (1) relates to providing a sliding member for assisting sliding at a position where the inner and outer tubes constituting the double tube rub against each other strongly. Depending on which of the inner and outer tubes is fixed and the length thereof, the following three points are mechanically effective to provide the sliding member.
There are two cases.

That is, (a) when the length of the outer tube to which the inner tube is fixed and slides on the outer surface thereof is shorter than the length of the inner tube,
(B) When the length of the inner tube that is fixed on the outer tube and slides on the inner surface does not exceed the length of the outer tube, or (c) The length of the inner tube that is fixed on the outer tube and slides on the inner surface. Is longer than the length of the outer tube. In the case of (a), on the inner surface of the upper and lower ends of the outer tube,
In the case of (b), the sliding member is preferably provided on the inner surface of the upper end of the outer tube and the outer surface of the lower end of the inner tube, and in the case of (c), the sliding member is preferably provided on the inner surfaces of the upper and lower ends of the outer tube.

By providing a sliding member at each part determined according to each of the above cases, it is possible to prevent the frictional force from becoming abnormally large or small depending on how an external force is applied when the product is used. Smooth operation without sound or vibration becomes possible.

As the sliding member, polyacetal resin,
Rings made of nylon resin, fluorine resin, or the like, gunmetal that has been subjected to solid lubricant treatment, or thrust ball bearings are preferably used.

In another preferred embodiment of the present invention,
(2) When the inner tube is fixed and the length of the outer tube sliding on the outer surface is shorter than the length of the inner tube, the outer tube is fixed between the lower end of the outer tube and the lower fixed end of the inner tube. If the length of the inner pipe that slides on the inner surface does not exceed the length of the outer pipe, slide between the lower end of the inner pipe and the lower fixed end of the outer pipe, or slide the inner pipe with the outer pipe fixed. When the length of the inner tube is longer than the length of the outer tube, the other tube is always raised between the flange fixed to the surface of the inner tube so as to slide in the outer tube and the lower fixed end of the outer tube. A lifting device provided with a coil spring that urges the reciprocating force of the coil spring when the other tube is at the highest point of its sliding range, approximately to the total weight of the supported object and the other tube. And the repulsive force of the coil spring when the other pipe is at the lowest point of the sliding range is the total weight of the supported object and the other pipe. The above-mentioned lifting device, which corresponds to twice the root,
Can be mentioned.

In the embodiment (2), a coil spring for constantly urging the movable tube upward is provided between the lower end of the movable tube supporting the object to be supported and the lower fixed end of the fixed tube. About. The positions where the coil springs are provided are classified into three cases (a), (b), and (c) as in the embodiment (1). In the case of (c), the force of the coil spring is received not by the lower end of the movable tube but by the lower surface of the flange-shaped member provided at the center.

With this product, when an object to be supported in a stationary state is to be moved upward, a force larger than the sum of the weight of the object to be supported and the frictional force of the sliding stopper is always used. It is necessary to push it up, which is equivalent to twice or more the weight of the supported object or the like. Conversely, when moving the supported object downward, little force is required. In the present embodiment, the imbalance of the vertical force is reduced by providing a coil spring, and is intended to be averaged.

Even when the movable tube is at the lowermost point of its sliding range, the repulsive force in that state is adjusted so that the supported object is not pushed up naturally by the repulsive force of the coil spring. The spring constant is determined within a range not exceeding approximately twice the weight. In addition, even when the movable tube is at the highest point of the sliding range, the repulsive force of the coil spring and the weight of the supported object and the like generally match so that the supported object is not naturally pulled down by the spring force. Let it. When the movable tube is in the middle of its sliding range, the spring expands and the repulsion decreases. Therefore, when the object to be supported is moved upward, a force corresponding to the decrease in the spring force must be applied upward, and when the object is moved downward, a force corresponding to the remaining spring force must be applied downward.

As still another preferred embodiment of the present invention, there are provided (3) a threaded sleeve erected in a radial direction on the front surface of the outer wall of the outer tube, and a threaded portion having a threaded portion at the tip and a threaded portion at the tip of the sleeve. A handle to be inserted, a pin which is held in the sleeve so as to be able to advance and retreat, a tip of which penetrates a hole provided in the outer tube wall in the sleeve mounting base, and a pin which is inside the sleeve and constantly urges the pin in the tube direction. A lock mechanism comprising a small coil spring and a plurality of recesses provided at predetermined intervals on the front surface of the inner tube and adapted to the tips of the pins, wherein the inner and outer tubes are relatively moved in a state where the handle is loosened. When moving, the tip of the pin can be moved from one of the recesses to the other while contacting the inner tube surface by the action of the small coil spring, and when the handle is tightened, the tip of the pin is Fits in a specific recess and is fixed , Thereby the lifting device comprising a locking mechanism for relatively fixed inner and outer tubes, and the like.

Embodiment (3) relates to providing a lock mechanism on the product. As described above, in the present article, if the supported object is moved to a desired height, the object stops at that position. By using the lock mechanism of the present embodiment, the stationary state can be fixed or released only by turning the handle. In the fixed state, even if a person stands on the supported object, the total weight can be supported. The locking position of this locking mechanism is discontinuous because it is determined by which of the plurality of recesses provided on the inner tube surface the tip of the pin fits discretely, but the position and spacing of the recesses should be selected appropriately. Thus, practical inconvenience can be avoided.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of a lifting device according to the present invention will be described with reference to the accompanying drawings.

(First Embodiment) Various arrangement examples of the sliding stop member in the lifting device according to the present invention will be described. FIG. 1 is a schematic view showing an example of the arrangement of the sliding stopper. 1, reference numeral 1 denotes an inner pipe, 2 denotes an outer pipe, 9 denotes a sliding stopper,
Reference numeral 91 denotes a sliding stop member holder. FIG. 1 (A), (B)
FIG. 1 (C) shows a case where the sliding stop member 9 is disposed on the surface of the inner tube 1 and the inner surface of the outer tube 2 slides on the surface of the sliding stop member.
(D) and (E) show the case where the sliding stop member 9 is arranged on the inner surface of the outer tube 2 and the surface of the inner tube 1 slides on the surface of the sliding stop member.

FIG. 1A shows that the diameter difference is relatively large (10 m).
This is an example in which a combination of double tubes is adopted, and the sliding stopper 9 is disposed on the surface of the inner tube 1 together with the sliding stopper holder 91. In this case, since the sliding member can also be disposed in the gap between the double tubes, neither the inner nor the outer tube needs drawing or expanding.

FIG. 1B shows that the diameter difference is relatively small (several meters).
This is an example in which a combination of double pipes is adopted, a groove is formed on the surface of the inner pipe 1 by drawing, and the sliding stopper 9 is accommodated therein. This type is suitable when the sliding member can be omitted. However, when the sliding member cannot be omitted, it is necessary to secure a space for the sliding member by pipe expansion or drawing.

FIG. 1C shows an example in which the sliding stop member 9 and the sliding stop member holder 91 are arranged on the inner surface of the outer tube 2 in the same tube configuration as in FIG. 1A. is there.
In comparison with the case of FIG. 1 (A), it can be mentioned that the frictional area of the sliding stop member 9 is relatively small, but on the other hand, a case where a straight shape having no accessories on the surface of the inner tube 1 is adopted. It can be considered that the removal work becomes easy.

FIGS. 1D and 1E show a case in which the shape of the sliding stop member 9 is different in the same configuration as in FIG. 1C. 1 (A) to 1 (C), a ring-shaped sliding stop member 9 having a rectangular cross section suitable for a resin or rubber foam is used, whereas FIGS. The sliding stop member 9) has an irregular cross section. Such a sliding stopper 9 is suitable for a solid rubber elastic body having relatively high hardness. Note that such a sliding stop member 9 is also applicable to the cases of FIGS. 1 (A) and 1 (B).

(Second Embodiment) Next, a description will be given of a case where the lifting device according to the present invention is provided with the sliding members, coil springs and lock mechanisms described in the above embodiments (1) to (3).

FIG. 2 is a schematic view showing a state in which the elevating device of the present invention includes the sliding members, coil springs, and lock mechanisms described in the above embodiments (1) to (3). FIG. 2 exaggerates the difference in the thickness of the inner and outer pipes, schematically shows the shape of each element, and does not distinguish which of the inner and outer pipes the sliding restraining member is fixed to. sell).

In FIG. 2, reference numeral 7 is a lock mechanism for fixing the relative movement of the inner and outer tubes, 8 is a sliding member, 10 is a coil spring, 11 is a flange-like member provided at the center of the inner tube 1,
The symbol W indicates a load due to a supported object or the like. Other reference numerals are the same as those in FIG.

FIG. 2A shows the above embodiments (1) and (2).
Corresponds to the case (a) mentioned in the above description. That is,
The inner tube 1 is fixed to the outer wall surface and floor surface, and the outer tube 2 that is shorter than the inner tube 1 slides on the outside thereof, and the object to be supported is supported by the outer tube 2. In this case, the sliding member 8 is attached to the inner surfaces of the upper and lower ends of the outer tube 2, and the coil spring 10 is attached to the inner tube 1.
Is inserted between the lower fixed end (floor surface) of the outer tube 2 and the lower end of the outer tube 2, and the lock mechanism 7 is attached to the lower tube wall of the outer tube 1. Note that the lock mechanism 7 can be attached to the upper tube wall of the outer tube 2. Here, when the sliding stopper 9 is attached to the outer tube 2 in the mode shown in FIG. 1C, the shape of the straight inner tube 1 having no attachments on the surface of the inner tube 1 is adopted. It is conceivable that the removal work becomes easy.

FIG. 2B shows the above embodiments (1) and (2).
Corresponds to the case of (b) mentioned in the description. That is,
The outer tube 2 is fixed to the outer wall surface and floor surface, and the inner tube 1 having a length not exceeding the length of the outer tube 2 slides inside the inner tube 1.
The supported object is supported by. In this case, the sliding member 8 is attached to the inner surface of the upper end of the outer tube 2 and the outer surface of the lower end of the inner tube 1, and the coil spring 10 is fixed to the lower fixed end (floor surface) of the outer tube 2.
And the lower end of the inner tube 1. In this case, the lock mechanism 7 is attached to the upper tube wall of the outer tube 2 where the surface of the inner tube 1 always exists.

FIG. 2C shows the above embodiments (1) and (2).
Corresponds to the case (c) mentioned in the above description. That is,
The upper and lower ends of the outer tube 2 are fixed to the outer wall surface, and the inner tube 1, which is longer than the outer tube 2, slides inside the inner tube 1, and the object to be supported is supported by the inner tube 1. In this case, the sliding member 8 is attached to the inner surfaces of the upper and lower ends of the outer tube 2, and the coil spring 10 is attached to the outer tube 2.
And a flange-shaped member 1 provided at a central portion of the inner tube 1
1 is inserted between the first and lower surfaces. In this case, the lock mechanism 7
Is attached to the upper tube wall of the outer tube 2 avoiding the coil spring 10.

2 (A), 2 (B), and 2 (C), the inner tube 1 can be straightened in the case of FIG. It can be attached to the lower part of the outer tube 2 that is less likely to be shaded, and in other respects, it is more preferable than other cases.

(Third Embodiment) FIG.
An elevating device (reference numeral 100) adopting the form of (C) and configured as a practical machine will be described. 3A is a side view showing the lifting device 100, and FIG. 3B is a partially enlarged cross-sectional view of the double pipes 1 and 2 included therein. FIG.
(C) is a front view of the lifting device 100.

In FIG. 3, reference numeral 3 denotes left and right outer tubes 2.
, 31 is a rib connecting member for connecting the left and right ribs, 4 is an angle for supporting a supported object fixed to the left and right ribs 3, 5 is an upper connecting member for connecting the left and right inner pipes 1 at the upper end. , 6 are lower connecting members for connecting the left and right inner pipes 1 below, 2
0 indicates a wash bowl (indicated by a dotted line because it is outside the present invention) as an example of a supported object. Other reference numbers are in FIG.
It is the same as FIG.

As shown in FIG. 3, in the pair of left and right double tubes 1 and 2 of the elevating device 100, the inner tube 1 is longer than the outer tube 2 and the upper and lower ends of the inner tube 1 And is fixed to a wall or the like via the lower connecting member 6 and is held vertically on the floor. A rib 3 is attached to the upper end of the outer tube 2, and the supported object 2 is placed on an angle 4 horizontally supported by the rib 3.
0 is fixed. The outer tube 2 is slidable in the axial direction with respect to the inner tube 1 by the difference between the lengths of the two tubes, so that the support height of the supported object 20 can be changed.

At a substantially central portion of the inner surface of the outer tube 2, there is provided a sliding stopper 9 made of a semi-rigid polyurethane elastomer foam having excellent durability against shear stress. The sliding stopper 9 is inserted into a sliding stopper holder 91 fixed to the inner surface of the outer tube 2 and fixed in position, and the inner tube 1 is pushed into its central hole while being compressed in the radial direction. . Thus, the sliding stopper 9 exerts a frictional force on the outer surface of the inner tube 1, and supports the weight of the supported object 20 and the outer tube 2 supporting the same. The installation location of the sliding stop member 9 may be the upper or lower portion of the outer tube 2 where the mounting operation is easy.

Thrust ball bearings are provided as sliding members 8 on the inner surfaces of the upper and lower ends of the outer tube 1, and between the lower end of the outer tube 1 and the lower connecting member 6 (fixed portion) of the inner tube 2. A coil spring 10 for constantly urging the outer tube 1 upward is inserted. The coil spring 10 has a natural length of the inner and outer tubes 1, 2
Of a length (about 300 mm) equal to about twice the maximum sliding range of. In addition, a lock mechanism 7 is provided at the lower part of the front wall of the outer tube 1.
A pin 73 of the lock mechanism 7 is provided on the front surface of the inner pipe 1.
The concave portions 76 for receiving the leading ends of are provided at appropriate intervals.

FIG. 4 is a partially cutaway side view showing an example of the detailed structure of the lock mechanism 7. As shown in FIG. In FIG. 4, reference numeral 71 denotes a handle having a threaded portion at the tip, reference numeral 72 denotes a threaded sleeve, reference numeral 73 denotes a pin which is held in the sleeve 72 so as to be able to advance and retreat, and reference numeral 74 denotes a pin in the sleeve 72 which always keeps the pin 73 in the pipe direction. A small coil spring to be urged, 75 indicates a hole provided in the outer tube wall, and 76 indicates a concave portion provided at a predetermined interval on the inner tube surface. The operation of the lock mechanism 7 has already been described in the embodiment (3) and will not be described.

[0043]

According to the first aspect of the present invention, the total weight of the object to be supported and the movable tube supporting the object is generally balanced by being supported by the frictional force of the sliding stopper, and the object to be supported can be adjusted to a desired height. If it is moved to the desired position, it stops at that position, so that the effect of being able to adjust to the target height with a very simple mechanism at any time, safely and easily can be obtained.

According to the second aspect of the present invention, in addition to the above-mentioned effects, the action of the sliding member prevents the frictional force from becoming abnormally large or small depending on how external force is applied during use. The effect is obtained that a smooth operation without abnormal noise and vibration is realized.

According to the third aspect of the present invention, in addition to the above-described effects, when the object to be supported is to be moved upward, a force that is always twice or more the weight of the object to be supported is required. The imbalance in the vertical direction, which requires almost no force when moving an object downward, is reduced and averaged by the action of the coil spring.

According to the fourth aspect of the invention, in addition to the above-described effects, the effect that the support height of the supported object can be easily fixed or released simply by turning the handle of the lock mechanism can be obtained.

In summary, according to the present invention, it is possible to adjust the supporting height of an object to be supported such as a washbasin in a relatively large ascending / descending range safely and simply without using any special tool or the like. A simple and low-cost lifting device which can be performed in a simple manner is provided.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment relating to an example of disposition of a sliding stop member in a lifting device according to the present invention.

FIG. 2 is a schematic view showing a second example including the sliding member, the coil spring, and the lock mechanism described in the embodiment.

FIG. 3 is a side view showing an elevating device as a third embodiment and an enlarged sectional view of a double pipe portion.

FIG. 4 is a partially cutaway side view showing an example of a detailed structure of a lock mechanism in a third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Inner tube 2 ... Outer tube 3 ... Rib 4 ... Horizontal angle 5 ... Upper connecting member 6 ... Lower connecting member 7 ... Lock mechanism 8 ... Sliding member 9 ... Sliding stop member 10 ... Coil spring 11 ... Spring at the center of inner tube Receiving 20: Supported object (washing bowl) 31: Rib connecting material 71: Handle 72: Threaded sleeve 7
DESCRIPTION OF SYMBOLS 3 ... Pin 74 ... Small coil spring 75 ... Hole in outer tube wall 76 ... Recess on inner tube surface 91 ... Sliding stopper holding member 100 ... Elevating device

Claims (4)

[Claims] An inner pipe or an outer pipe of a pair of left and right double pipes is vertically fixed, and a supported object is supported on an upper end of the other pipe. An elevating device in which the supporting height of the object to be supported can be freely changed by sliding the tube in the axial direction, wherein the sliding for stopping the slip in the gap between the outer surface of the inner tube and the inner surface of the outer tube. An elevating device, wherein a stopping member is densely interposed, and a frictional force of the sliding stopping member and a total weight of the supported object and the other pipe are substantially balanced. 2. When the one tube is an inner tube and the length of the outer tube sliding on the outer surface is shorter than the length of the inner tube, the inner surface of the upper and lower ends of the outer tube is provided with the one tube. If the pipe is an outer pipe and the length of the inner pipe that slides on the inner surface does not exceed the length of the outer pipe, on the inner surface of the upper end of the outer pipe and the outer face of the lower end of the inner pipe, or If the one pipe is an outer pipe, and the length of the inner pipe sliding on the inner surface is longer than the length of the outer pipe, the inner surfaces of the upper and lower ends of the outer pipe are provided with the surfaces of the respective ends and the counterpart. The lifting device according to claim 1, wherein a sliding member for assisting sliding with the surface is fixed. 3. When the one pipe is an inner pipe and the length of the outer pipe sliding on the outer surface is shorter than the length of the inner pipe, a lower end of the outer pipe and a lower fixed end of the inner pipe. In the case where the one pipe is an outer pipe and the length of the inner pipe sliding on its inner surface does not exceed the length of the outer pipe, the lower end of the inner pipe and the lower part of the outer pipe Between the outer tube and the fixed end, or when the one tube is an outer tube and the length of the inner tube sliding on the inner surface is longer than the length of the outer tube, A lifting / lowering device comprising a coil spring for constantly urging the other tube upward between a flange fixedly slidably mounted on the outer tube and a lower fixed end of the outer tube; Is at the highest point of the sliding range, the repulsion force of the coil spring substantially matches the total weight of the supported object and the other tube, and the other tube As the repulsive force of the coil spring when in the lowest point of the sliding range is equivalent to approximately 2 times the total weight of the supported object and the other tube, the lifting device according to claim 1 or 2. 4. A threaded sleeve erected in a radial direction on a front surface of a wall of the outer tube, a handle having a threaded portion at a tip and screwed into the tip of the sleeve, and reciprocating into the sleeve. A pin that is freely held and has a tip that penetrates a hole provided in the outer tube wall in the sleeve mounting base; a small coil spring in the sleeve that constantly biases the pin in the tube direction; A plurality of recesses provided at predetermined intervals on the front surface of the tube and adapted to the tip of the pin, wherein the inner and outer tubes are relatively moved in a state where the handle is loosened. When making, the tip of the pin can move from one of the recesses to another while contacting the inner tube surface by the action of the small coil spring, and in a state in which the handle screw is tightened, The tip of the pin Is fixed fitted to the-option has been said recess, thereby provided with a locking mechanism, which relatively fixing the inner and outer tubes, the lifting device according to claim 1, 2 or 3.