JP4832977B2 - Up and down elastic structure of furniture legs - Google Patents

Description

  The present invention relates to a vertically extending structure of legs used for furniture such as a table that can be raised and lowered.

In the furniture such as a table for raising and lowering the top plate, there is an advantage that the height of the top plate can be adjusted according to the physique of the user, the work content, etc., and a comfortable work environment can be formed.
For such furniture, a leg that can be expanded and contracted is used, and examples of the conventional leg stretchable structure include those described in Patent Documents 1 to 3.
JP 2001-128744 A JP 2003-125849 A Japanese translation of PCT publication No. 2003-530181

  Each of the leg stretchable structures described in Patent Documents 1 and 2 has a fixed outer leg that touches the floor and an inner part that is fitted into the leg so as to move up and down via a lifting mechanism. Because of the one-stage nesting structure with the legs, it is not possible to secure a lifting stroke that is greater than the fitting part between the outer legs and the inner legs, and the more the inner legs are raised, the more the fitting dimensions with the outer legs are. Since it becomes small and becomes wobbled easily, the upper limit height of the top plate is naturally limited.

  On the other hand, in the telescopic structure of the leg described in Patent Document 3, the leg is configured to be able to move up and down with respect to the stationary outer leg, an intermediate inner leg fitted therein so as to be movable up and down, and the intermediate inner leg. Since it has a two-stage nesting structure with the internally fitted inner legs, it is possible to secure a large lifting stroke as compared with those of Patent Documents 1 and 2.

  However, when the lifting mechanism is operated to extend the legs, the intermediate inner legs are lifted simultaneously with respect to the outer legs, and the inner legs are lifted simultaneously with respect to the intermediate inner legs. Not only does the sliding resistance of the moving surface increase, but even when it is not necessary to increase the height of the leg too much, a two-step difference is formed in the middle part of the outer peripheral surface of the leg, Appearance worsens.

  Further, the intermediate inner leg and the inner leg are simultaneously lifted and lowered by a screw moving type lifting mechanism having a complicated structure housed therein, so that the leg width and the like are increased in size and the cost is increased. There is a problem.

  The present invention has been made in view of the above problems, and can raise and lower the stroke of the leg, and at a predetermined height, only the inner leg or the intermediate inner leg is raised while being fitted to the inner leg. In order to reduce the sliding resistance of the sliding surface and prevent the formation of two steps of upper and lower steps on the outer peripheral surface, and further simplify the structure of the lifting mechanism, so that it is small and inexpensive. The object is to provide a vertically extending structure for furniture legs.

According to the present invention, the above problem is solved as follows.
(1) Immovable and cylindrical outer legs that face in the vertical direction, cylindrical intermediate inner legs that are fitted in the outer legs so as to be able to be raised and lowered, and inner legs that are fitted in the intermediate inner legs so as to be raised and lowered. In a vertically extending structure of the leg of the furniture in which the leg is constituted by an inner leg that supports the top plate and the like, and the leg is expanded and contracted by an elevating mechanism provided in the leg, the inner leg is In addition to being able to be raised and lowered by the elevating mechanism, the intermediate inner leg is always urged downward by the downward urging means, and when the inner leg is raised to a predetermined position, it is interlocked with the inner leg. The intermediate inner leg is raised against the urging means.

(2) In the above item (1), the downward biasing means is provided inside the outer leg and the intermediate inner leg, and the lower end is locked to the lower end of the outer leg and the upper end is locked to the intermediate inner leg. A tension coil spring.

(3) Immovable and cylindrical outer legs facing upward and downward, cylindrical intermediate inner legs fitted in the outer legs so as to be able to be raised and lowered, and fitted into the intermediate inner legs so as to be raised and lowered, and furniture by an upper end. In a vertically extending structure of the leg of the furniture in which the leg is constituted by an inner leg that supports the top plate and the like, and the leg is expanded and contracted by an elevating mechanism provided in the leg, the inner leg is The lifting mechanism can be moved up and down, and the intermediate inner leg is always biased upward by an upward biasing means so that the intermediate inner leg can be lifted together with the inner leg while being fitted on the inner leg. When the intermediate inner leg and the inner leg are raised to a predetermined position, the raising of the intermediate inner leg is stopped by the stopper means so that only the inner leg is raised.

(4) In the above item (3), the upward biasing means is provided inside the intermediate inner leg and the cylindrical inner leg, the lower end is the lower end of the intermediate inner leg, and the upper end is the lower end portion of the inner leg. The tension coil springs are respectively locked.

(5) In any one of the above items (1) to (4), the elevating mechanism is screwed into the female screw rod with the lower end fixed to the lower end of the outer leg and facing upward and the female screw rod, and the upper end And a screw shaft fixed to the upper end of the inner leg or the lower surface of the top plate or the like.

(6) In any one of the above items (1) to (5), either the inner peripheral surface of the outer leg or the outer peripheral surface of the intermediate inner leg, and the inner peripheral surface of the intermediate inner leg and the outer peripheral surface of the inner leg Is provided with a slider made of a synthetic resin having a small frictional resistance, which is in sliding contact with the other.

(7) In any one of the above items (1) to (6), stoppers are provided inwardly on the inner surfaces of the upper ends of the outer leg and the intermediate inner leg, and the outer surface in the intermediate inner leg and the inner leg is vertically oriented. A projecting portion for stopping the intermediate inner leg and the inner leg at the upper limit position is provided outwardly by contacting the stopper at a position slightly below the center.

(8) In any one of the above items (1) to (7), the lower ends of the intermediate inner leg and the inner inner leg are brought into contact with the inner surfaces of the lower end portions of the outer leg and the intermediate inner leg, so that they are stopped at the lower limit position. The stopper to be projected protrudes inward.

According to the first aspect of the present invention, since the intermediate inner leg rises with respect to the stationary outer leg and the inner leg rises with respect to the intermediate inner leg, the lifting stroke of the leg can be increased.
Further, until the inner leg is raised to a predetermined position, the intermediate inner leg is restricted from being raised from within the outer leg by the biasing means, and only the inner leg is raised. The sliding resistance of the sliding surface at the time of ascent is reduced, and when the height of the leg does not need to be so high, it is prevented that two steps of upper and lower steps are formed on the outer peripheral surface of the leg. , The appearance is better.

  Further, the intermediate inner leg is raised in conjunction with the inner leg and lowered by the downward biasing means, and there is no need for a lifting means for directly raising and lowering the intermediate inner leg. There is no need to provide an elevating mechanism, the leg can be miniaturized, and cost can be reduced.

  According to the second aspect of the present invention, the intermediate inner leg can be reliably urged downward by the general-purpose inexpensive tension coil spring, and also when the leg is lowered from the upper limit position, It can be lowered in order of legs.

  According to the invention of claim 3, as in the case of claim 1 above, the lifting and lowering stroke of the leg can be increased, and the intermediate inner leg rises in a state fitted to the inner leg and rises to a predetermined position. In this case, since the rise of the intermediate inner leg is stopped and only the inner leg is raised, the sliding resistance of the sliding surface when rising to a predetermined height is reduced.

  Further, as in the first aspect, when the height of the leg body does not need to be so high, there is no upper and lower two-step difference on the outer peripheral surface, and the lifting and lowering that directly raises and lowers the intermediate inner leg. Since no means is required, the leg can be reduced in size and cost can be reduced.

  According to the invention described in claim 4, as in the invention of claim 2, the intermediate inner leg can be reliably urged upward by the general-purpose inexpensive tension coil spring, and the leg is lowered from the upper limit position. Even in this case, the inner leg and the intermediate inner leg can be lowered in order.

  According to the invention described in claim 5, the structure of the lifting mechanism is simple and the front / rear / left / right dimensions can be minimized. By simply selecting the length of the shaft, the lifting stroke of the leg can be changed relatively easily.

  According to the sixth aspect of the present invention, since the sliding resistance of the sliding surfaces of the outer leg and the intermediate inner leg and between the intermediate inner leg and the inner leg is reduced, the load applied to the lifting mechanism is reduced. At the same time, the legs can be easily expanded and contracted.

  According to the seventh aspect of the present invention, by providing the protrusion that contacts the stopper of the inner surface of the upper end portion of the outer leg and the intermediate inner leg slightly below the center of the intermediate inner leg and the inner leg in the vertical direction, Even if the inner leg and the inner leg are raised to the upper limit position, a relatively large fitting allowance is secured between them and the outer leg and the intermediate inner leg. No, it can stably support the top plate and the like.

  According to the invention described in claim 8, since the intermediate inner leg and the inner leg are stopped at the lower limit position by the stopper, a load such as a top plate is not directly applied to the elevating mechanism at the lower limit position. By using this together with the upper limit stopper, the lifting stroke of the leg can be accurately set.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a table to which the present invention is applied. This table is a pair of left and right legs (1) and (1), and before and after connecting their opposing surfaces (hereinafter referred to as FIG. 1). There are provided two connecting plates (2) and (2), which will be described with the diagonally lower right as the front, and a top plate (3) supported on the upper ends of both legs (1) so as to be adjustable in height.

  The left and right legs (1) stand up from the center of the base legs (4) and (4) facing the front and rear direction at the lower end as shown in the exploded perspective view of FIG. The outer leg (5) is made of steel or the like that is wide in the front-rear direction and is open at both upper and lower ends, and the upper and lower ends are fitted into the outer leg (5) so as to be vertically movable. An intermediate inner leg (6) such as an aluminum alloy having a rectangular tube shape, and an aluminum alloy having an angular tube shape that is fitted in the intermediate inner leg (6) so as to be vertically movable and open at both upper and lower ends. The inner leg (7) and the upper leg of the outer leg (5), the middle inner leg (6) and the thick part (8) formed at the front and rear ends of the inner leg (7) A pair of female screw holes (9) and (9) are formed in front and rear, which face the direction.

  At the upper end of the inner leg (7), the lower surface of the center part of the top plate support member (11) having a square bottomed hole (10) in the center part is inserted through the bottomed hole (10). The two front and rear bolts (12) and (12) are fixed by screwing into the female screw holes (9) at the upper end of the inner leg (7). (13) and (13) are a pair of front and rear top plate support rods connecting the opposing surfaces of the left and right top plate support members (11).

  On the front and rear surfaces of the lower end of the intermediate inner leg (6) and the inner leg (7), as shown in an enlarged view in FIG. The flat fixed sliders (14), (14) with ridges have upper and lower split elastic protrusions (15), (15) projecting on their facing surfaces on both front and rear sides of the intermediate inner leg (6). It is attached by press-fitting into the drilled fitting holes (16) and (16), and fixed to the front and rear ends of the lower ends of the left and right side surfaces, two front and rear with the outer surface forming a flat surface. The sliders (17) and (17) are attached by press-fitting the elastic protrusions (18) provided on the opposing surfaces into the fitting holes (19) and (19) on both the left and right sides. .

  Each of the fixed sliders (14) and (17) is formed of a hard synthetic resin having a low frictional resistance, such as polyacetal, and the outer surfaces thereof are in the hollow holes of the outer leg (5) and the intermediate inner leg (6). The inner surface of the front, rear, left and right can be slidably contacted up and down.

  Since the middle inner leg (6) and inner leg (7) are formed slightly below the center in the vertical direction on both front and rear sides, the screw hole (20) (the inner leg is not shown) has a pair of front and rear bolts. (21) (21) is screwed, and its head functions as an upper limit stopper projection for stopping the intermediate inner leg (6) and the inner leg (7) at the upper limit position (details will be described later). The front and rear dimensions of the head of the bolt (21) are slightly smaller than the plate thickness of the fixed slider (14) so as not to be in sliding contact with the inner surfaces of the outer leg (5) and the intermediate inner leg (6).

  As shown in FIG. 8, on the inner surfaces facing the front and rear at the lower ends of the outer leg (5) and the intermediate inner leg (6), fixed sliders at the front and rear of the intermediate inner leg (6) and the inner leg (7), respectively. (14) When the lower ends of (14) are brought into contact with each other, lower limit stopper protrusions (22) and (22) for stopping both the legs (6) and (7) at the lower limit position are provided inwardly. The stopper protrusion (22) may be brought into direct contact with the lower ends of the intermediate inner leg (6) and the inner leg (7) instead of the fixed slider (14).

  As shown in FIGS. 3 and 8, a tension coil spring is provided between a lower end portion in the intermediate inner leg (6) and a closing plate (23) fixed to the lower surfaces of the base legs (4) and (4). (24) locks its lower end into a locking hole (25) provided in the closing plate (23), and its upper end is inserted into the center of the lower part of the intermediate inner leg (6). By engaging with the annular groove (26a) of the locking bolt (26) facing in the left-right direction, the tip of which is screwed into the female screw hole, the intermediate inner leg (6) is always urged downward. It is stretched.

  A long hole (27) opening downward that can be fitted to the locking bolt (26) from above is formed at the center of the lower end of the left and right side walls of the inner leg (7). Can move to the lower limit without interfering with the locking bolt (26).

  In FIG. 2, (28) is an elevating mechanism for the left and right legs (1), which is a rectangular tube-shaped female screw rod (29) that is longer than the outer leg (5) and faces the vertical direction, A box-shaped case attached to the upper end of the screw shaft (30) and the screw shaft (30), which is approximately the same length as the female screw 杆 (29), and is screwed into the female screw (not shown) in the vertical direction. The driven bevel gear (32) (see FIG. 8), which is housed in the rotary drive unit (31) and rotates integrally with the screw shaft (30), is meshed with the driven bevel gear (32) and faces in the left-right direction. It is a known screw-moving type comprising a drive bevel gear (33) (see FIG. 8) that rotates about an axis.

  The elevating mechanism (28) is located slightly above the inside of the inner leg (7), the intermediate inner leg (6) and the outer leg (5) from above the bottomed hole (10) of the top plate support member (11). The lower end of the screw rod (29) is fixed by a set screw (34) inserted from below the closing plate (23) so as to be inserted and brought into contact with the upper surface of the closing plate (23) (see FIG. 8). . At the time of fixing, the upper end portion of the female screw rod (29) is positioned slightly above the upper end of the outer leg (5) in order to ensure the required lifting stroke of the leg body (1). (See FIG. 8).

  The rotary drive part (31) of the lifting mechanism (28) is fixed to the bottomed hole (10) of the top plate support member (11) by two set screws (35) (35) inserted from the outside. Has been.

(36) is a drive shaft connected to the drive bevel gear (33) of the left and right lifting mechanism (28). By rotating the drive shaft (36) by a motor or an operation handle (both not shown), The screw shaft (30) of the elevating mechanism (28) can be rotated synchronously via the drive bevel gear (33) and the driven bevel gear (32).
As a result, the left and right screw shafts (30) move in the vertical direction in synchronization with the female screw rod (29), and the height of the top plate (3) is adjusted.

  As shown in FIG. 2 and FIG. 8, the intermediate inner leg (6) and the inner leg (7) are inserted into the upper ends of the outer leg (5) and the intermediate inner leg (6), respectively, so Synthetic resin guide members (37) and (37) that are slidably held and guided are attached.

  Both guide members (37) have the same structure except for the size, and as shown in FIGS. 4 to 6, the outer leg (5) and the intermediate inner leg (6) are hollow in both upper and lower sides. A sleeve (37a) that is long in the front-rear direction that can be fitted into the hole, and a hollow hole on the upper surface of the outer leg (5) and the intermediate inner leg (6) connected to the opening edge of the upper end. And a horizontal hook-shaped cover piece (37b) that can cover the outer peripheral portion.

  At the center of the outer surface of the front and rear of the sleeve (37a), a vertically extending ridge (38) is formed, and on the inner surface of the corresponding sleeve (37a), a vertically extending groove (39) is formed. Is formed. The lower end of the sleeve (37a) also serves as a stopper for stopping the intermediate inner leg (6) and the inner leg (7) at the upper limit position when the head of the bolt (21) contacts.

  The front and rear ridges (38) are formed with two upper and lower female screw holes (40) and a through hole (41) penetrating inward and outward at a central portion therebetween.

  On the inner surface of the front and rear of the sleeve (37a), a flat plate-like movable slider (42) (42) facing the up-down direction has a protrusion (42a) facing the up-down direction at the center of the outer surface to the concave line (39). Attached so that it can be moved inward and outward by fitting a split elastic protrusion (43) at the center of the ridge (42a) into the through hole (41) while fitting from the inside. It has been.

  The movable slider (42) is formed of a hard synthetic resin having a low frictional resistance, such as polyacetal.

  A bottomed recessed hole (44) (44) is formed at a position corresponding to the female screw hole (40) of the sleeve (37a) at the upper and lower ends of the protrusion (42a) of the movable slider (42). The movable slider (42) is pushed inward by inserting the end of a hexagon socket head screw (45) (45) screwed into the upper and lower female screw holes (40) into both concave holes (44). be able to.

  That is, as shown in FIG. 7, after the guide member (37) is fitted to the intermediate inner leg (6) and the inner leg (7), the screw (45) is tightened to move both the movable sliders (42) inward. , The gap and pressure contact force between the inner surfaces of both movable sliders (42) and the front and rear outer surfaces of the intermediate inner leg (6) and inner leg (7) can be finely adjusted. This prevents the middle inner leg (6) and the inner leg (7) from wobbling in the front-rear direction, and makes the legs (6) (7) stable and smooth by optimizing the sliding resistance. Can be lifted and lowered.

  In the two front and rear through holes (46) and (46) drilled in the left and right side pieces of the sleeve (37a), there are disk-shaped fixed sliders (47) and (47) whose inner surface forms a flat surface. The plurality of elastic protrusions (47a) on the outer surface are attached by press-fitting the sleeves (37a) into the through holes (46). On the inner surface of the mounting portion of each fixed slider (47), a concave portion (48) having a downward U-shape when viewed from the side is formed so that the fixed slider (47) does not protrude greatly inward.

  Similarly to the movable slider (42), the fixed slider (47) is made of polyacetal or the like having a low frictional resistance, and has an intermediate inner leg (6) and inner legs (7) on the inner surface of the four fixed sliders (47). ) Can slide up and down smoothly.

  As shown in FIG. 2, the upper and lower guide members (37) for guiding the intermediate inner leg (6) and the inner leg (7) are fitted with sleeves (37a) inside the legs (6) and (7) from above. After joining, the countersunk screws (50) inserted in the front and rear tapered mounting holes (49, 49) of the cover piece (37b) are provided in the screw holes ( It is fixed to the upper ends of both legs (6) and (7) by screwing to 9).

Next, with reference to FIGS. 8-10, the effect | action at the time of leg (1) expansion-contraction is demonstrated.
FIG. 8 shows a partially cutaway longitudinal side view when the elevating mechanism (28) is not operated, that is, when the height of the top plate (3) is at the lower limit. The leg (6) and the inner leg (7) are positioned at the lower limit in the outer leg (5) due to the spring force of the tension coil spring (24) and the load of the top plate (3), respectively. The vertical dimension of 1) is the smallest.

In this state, when the drive bevel gear (33) and the driven bevel gear (32) of the elevating mechanism (28) are actuated, as shown in FIG. 30) moves upward so that the top end is fixed to the top plate support member (11), top plate (3), and top plate support member (11) fixed to the top end of the screw shaft (30). The legs (7) rise as a unit first.
At this time, since the intermediate inner leg (6) is biased downward by the tension coil spring (24), it does not rise.

  When the inner leg (7) is raised to the upper limit position, that is, the heads of the bolts (21) on both front and rear sides thereof are in contact with the lower end of the guide member (37) attached to the upper end of the intermediate inner leg (6), As shown in FIG. 10, the intermediate inner leg (6) is lifted together with the inner leg (7) while extending the tension coil spring (24), and the bolts (21) on both front and rear sides of the intermediate inner leg (6) are lifted. The head stops at the upper limit position where it abuts the lower end of the guide member (37) attached to the upper end of the outer leg (5).

Thereby, the height of the top plate (3) becomes the highest.
When the elevating mechanism (28) is reversed from the state of FIG. 10 and the top plate (3) is lowered, first, the intermediate inner leg (6) urged downward by the tension coil spring (24) is first removed. The inner leg (7) is accommodated in the intermediate inner leg (6).

  As described above, in the leg stretchable structure of the above-described embodiment, the leg (1) includes the intermediate inner leg (6) fitted in the stationary outer leg (5) and the intermediate inner leg ( 6) Since it is nested in two stages with the inner leg (7) for supporting the top plate (3) fitted inside, a large lifting stroke can be secured, and the upper limit of the top plate (3) can be secured. The height can be increased.

  Further, in the first stage, since the rise of the intermediate inner leg (6) is stopped and only the inner leg (7) is raised, the sliding resistance of the sliding surface is reduced and the leg ( 1) When there is no need to increase the height of the top plate (3), the upper and lower steps are not formed on the outer peripheral surface of the leg (1), and the appearance is improved. .

  Furthermore, when the inner leg (7) is raised to a certain height, the intermediate inner leg (6) is also raised in conjunction therewith, so there is no need to use a screw moving type lifting mechanism having a complicated structure, and the leg (1 ) Can be reduced in size (thinner) and cost can be reduced.

  The intermediate inner leg (6) and inner leg (7) are adjusted so as to have an optimum pressure contact force and sliding resistance by a pair of movable sliders (42) which can adjust the front and rear positions provided on the guide member (37). Therefore, even when the legs (6) and (7) are raised to the vicinity of the upper limit position, the leg (1) is stable and the expansion and contraction motion is smooth.

11 and 12 show another embodiment of the present invention.
In this embodiment, between the lower end of the intermediate inner leg (6) and the inner leg (7), a tension coil spring that constantly biases the intermediate inner leg (6) upward, that is, toward the inner leg (7). When the intermediate inner leg (6) and the inner leg (7) are raised at the same time and the intermediate inner leg (6) is raised to the upper limit in the first stage, as shown in FIG. A second stage rise is performed by the legs (7).

  When lowering from the upper limit position, the inner leg (7) is first lowered and accommodated in the intermediate inner leg (6), and then the intermediate inner leg (6) is accommodated in the outer leg (5). .

  Also in this embodiment, in the first stage, the rise of the inner leg (7) with respect to the intermediate inner leg (6) is stopped, and only the intermediate inner leg (6) rises. When the resistance is reduced and the height of the top plate (3) does not need to be so high, it is possible to prevent the upper and lower steps from being formed on the outer peripheral surface of the leg (1).

  In this embodiment, instead of the tension coil spring (24), an upward biasing force such as a compression coil spring is provided between the intermediate inner leg (6) and the closing plate (23) of the base leg (4). Means may be provided.

  The means for constantly urging the intermediate inner leg (6) downward is fixed to a weight suspended by a wire or the like or a lower end portion of the intermediate inner leg (6) instead of the tension coil spring (24). Sometimes used as a weight.

It is a perspective view of the table to which this invention is applied. Similarly, it is an exploded perspective view of one leg. It is a disassembled perspective view which shows the detail of the lower part of an intermediate | middle inner leg. It is a disassembled perspective view of a guide member. FIG. 5 is an enlarged cross-sectional plan view taken along line VV in FIG. 4. It is the VI-VI line expansion vertical side view of FIG. Similarly, it is an enlarged vertical side view when the movable slider is moved inward. It is a vertical side view of the principal part when a leg body exists in the lowest limit position. Similarly, it is a vertical side view of the main part when the inner leg is raised to the upper limit. Similarly, it is a vertical side view of the main part when the leg is extended to the upper limit position. In other embodiment of this invention, it is a vertical side view of the principal part when an intermediate | middle inner leg and an inner leg raise simultaneously. Similarly, it is a vertical side view of the main part when the leg is extended to the upper limit position.

Explanation of symbols

(1) Leg
(2) Connecting plate
(3) Top plate
(4) Base leg
(5) Outer legs
(6) Intermediate inner leg
(7) Inner leg
(8) Thick part
(9) Female thread hole
(10) Bottomed hole
(11) Top plate support member
(12) Bolt
(13) Top plate support
(14) Fixed slider
(15) Elastic protrusion
(16) Mating hole
(17) Fixed slider
(18) Elastic protrusion
(19) Mating hole
(20) Female thread hole
(21) Bolt
(22) Lower limit stopper protrusion
(23) Blocking plate
(24) Tension coil spring
(25) Locking hole
(26) Locking bolt
(26a) Annular groove
(27) Long hole
(28) Lifting mechanism
(29) Female thread 杆
(30) Screw shaft
(31) Rotation drive unit
(32) Driven bevel gear
(33) Drive bevel gear
(34) Set screw
(35) Set screw
(36) Drive shaft
(37) Guide member
(37a) Sleeve
(37b) Cover piece
(38) Projections
(39) Recess
(40) Female thread hole
(41) Through hole
(42) Movable slider
(42a) ridge
(43) Elastic protrusion
(44) Recessed hole
(45) Screw
(46) Through hole
(47) Fixed slider
(47a) Elastic protrusion
(48) Recess
(49) Mounting hole
(50) flat head screw

Claims (8)

A stationary and cylindrical outer leg facing up and down, a cylindrical intermediate inner leg fitted inside the outer leg so that it can be raised and lowered, and an inner top leg fitted inside the middle inner leg so that it can be raised and lowered, and the top of the furniture by the upper end In the vertical extension structure of the leg of the furniture in which the leg is constituted by the inner leg that supports the leg and the leg is extended and retracted by the lifting mechanism provided in the leg,
The inner leg can be moved up and down by the elevating mechanism, and the intermediate inner leg is constantly urged downward by the downward urging means, and when the inner leg is raised to a predetermined position, A vertically extending structure for a leg of furniture, wherein the intermediate inner leg rises against the urging means in conjunction with the leg.   The downward biasing means is provided as a tension coil spring provided inside the outer leg and the intermediate inner leg, the lower end being locked to the lower end of the outer leg and the upper end being locked to the intermediate inner leg, respectively. Up-and-down elastic structure of furniture legs. A stationary and cylindrical outer leg facing up and down, a cylindrical intermediate inner leg fitted inside the outer leg so that it can be raised and lowered, and an inner top leg fitted inside the middle inner leg so that it can be raised and lowered, and the top of the furniture by the upper end In the vertical extension structure of the leg of the furniture in which the leg is constituted by the inner leg that supports the leg and the leg is extended and retracted by the lifting mechanism provided in the leg,
The inner leg can be moved up and down by the lifting mechanism, and the intermediate inner leg can be lifted together with the inner leg while being fitted on the inner leg. The furniture is characterized in that when the intermediate inner leg and the inner leg are lifted to a predetermined position, the intermediate inner leg is stopped by the stopper means and only the inner leg is raised when the intermediate inner leg and the inner leg are raised to a predetermined position. The upper and lower elastic structure of the leg.   A tension coil spring provided with an upward biasing means inside the intermediate inner leg and a cylindrical inner leg, with the lower end locked to the lower end of the intermediate inner leg and the upper end to the lower end of the inner leg. The up-and-down elastic structure of the leg of the furniture of Claim 3.   The elevating mechanism is screwed into the female screw く facing the vertical direction with the lower end fixed to the lower end of the outer leg, and the rotational drive part at the upper end is fixed to the upper end of the inner leg or the lower surface of the top plate, etc. The vertically extending structure of the leg of furniture according to any one of claims 1 to 4, comprising a screw shaft.   A composite with low frictional resistance that is in sliding contact with either the inner peripheral surface of the outer leg or the outer peripheral surface of the intermediate inner leg, or the inner peripheral surface of the intermediate inner leg or the outer peripheral surface of the inner leg. The up-and-down elastic structure of the leg of furniture in any one of Claims 1-5 provided with a resin-made slider.   A stopper is provided inwardly on the inner surfaces of the upper ends of the outer leg and the intermediate inner leg, and the stopper is brought into contact with the stopper slightly below the vertical center of the outer surface of the intermediate inner leg and the inner leg, respectively. The vertically extending structure of the leg of furniture according to any one of claims 1 to 6, wherein the intermediate inner leg and a protrusion for stopping the inner leg at the upper limit position are provided to project outward.   8. The stopper according to claim 1, wherein a stopper for stopping the lower end of the intermediate inner leg and the inner leg is inwardly protruded inwardly by contacting the lower ends of the outer leg and the intermediate inner leg with the lower end portions of the inner leg. A vertically extending structure of the leg of the furniture according to any one of the above.

Images