JP2002177051A - Elevating device for top board of furniture and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevating device capable of being conveniently utilized to support an ascendable/descendable top board mounted on various kinds of furniture and the like. SOLUTION: A rod-shaped elevating body 2 is provided with a swinging piece 18 fitted with a main part 20 to be locked, which is engaged with a rack gear-like main locking part 11 on the side of a fixing guide member 1 so as to allow for the ascent of the elevating body 2 and block the descent thereof, a spring 22 for urging the swinging piece 18 to be switchable between an operative attitude and a retreating attitude, and a sub-part 23 to be locked, which is not engaged with the locking part 11. The guide member 1 is provided with a sub-locking part 16 for blocking the ascent of the elevating body 2 via the sub-part 23 when the main part 20 gets over the uppermost protrusion 10A of the locking part 11 in an upward direction. The descent of the elevating body 2 from this state makes the swinging piece 18 swing so as to make the main part 20 engaged with the upper section of the uppermost protrusion 10A and makes the sub-part 23 disengaged from the sub-locking part 16 for the purpose of allowing for the ascent of the elevating body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device used for supporting a top plate of a desk for schoolchildren, a top plate of a side desk, and other various types of furniture.

[0002]

2. Description of the Related Art A lifting device of this type comprises a rod-shaped lifting member mounted on a lifting member such as a top plate, and a fixed guide member mounted on a furniture body or the like and guiding the rod-shaped lifting member so that it can be raised and lowered. However, as a lifting device of this type, an automatic lifting device that can automatically lock the bar-shaped lifting member to the fixed guide member at the raised height only by lifting the rod-shaped lifting member to an appropriate height, A latch type is known.

[0003] This automatic latching type elevating device is provided with a rack gear-shaped locking portion provided on the fixed guide member side and a rod-shaped elevating member which is rotatably supported and allows the rod-shaped elevating member to rise but not to descend. A swinging piece provided with a main locked portion that engages with the main locking portion; and a swinging posture in which the main locked portion engages with the main locking portion. A spring that is switchably biased to a retracted position in which the locking portion is not engaged with the main locking portion. When the rod-shaped elevating body is lowered to the lower limit, the swinging piece is automatically returned from the retracted posture to the original working posture.

[0004]

However, in this type of the conventional automatic latch type lifting / lowering device, when the bar-shaped lifting / lowering body is pulled up to the limit, the swinging piece is switched to the retracted position as described above. As a result, the rod-shaped elevating body can be lowered to the lower limit. Therefore, when the rod-shaped elevating body is supported at the ascending limit height at which the locked portion is locked on the uppermost projection of the locking part, the rod-shaped elevating body is not pulled up to the ascending limit, and the position immediately before that is set. That is, when the locked portion has climbed over the uppermost protrusion of the locking portion, the lifting of the rod-shaped lifting body is stopped,
The locked portion must be engaged with the uppermost projection of the locking portion by the swing of the rocking piece. In other words, it is very difficult to support the rod-shaped elevating body at the ascending limit height, and in practice, of the number of supporting steps of the rod-shaped elevating body, only the area except the top is used. The entire length of the fixed guide member could not be used effectively.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lifting device capable of solving the above-mentioned conventional problems. In addition, a rod-shaped elevating member 2 attached to an elevating member such as a top plate, and a fixed guide member 1 attached to a furniture body or the like and guiding the rod-shaped elevating member 2 to be able to move up and down.
The fixed guide member 1 is provided with a main locking portion 11 in the form of a rack gear in the vertical direction, and the rod-shaped elevating body 2 is configured to allow the rod-shaped elevating body 2 to rise but prevent the descent. A swinging piece 18 provided with a main locked portion 20 that engages with the main locking portion 11, and the swinging piece 18 is connected to the main locked portion 2.
A spring 22 that urges switchably between an operating position in which the main locking portion 11 is engaged with the main locking portion 11 and a retracted position in which the main locked portion 20 is not engaged with the main locking portion 11; At the upper end of the main locking portion 11, an unlocking guide portion 13 that switches the swinging piece 18 from the operating position to the retracted position as the rod-shaped elevating body 2 rises is continuously provided, and the lower end of the main locking portion 11 is provided. A lifting / lowering device provided with a locking return guide portion 14 for returning the swinging piece 18 in the retracted position to the operating position as the rod-shaped lifting body 2 descends. On the side farther from the horizontal support shaft 17 than the main locked portion 20, a sub locked portion 23 which is not engaged with the main locking portion 11 is provided. When the vehicle gets over the uppermost protruding portion 10A of the main locking portion 11, the sub-locked portion 2
Sub-locking portion 16 for preventing rod-shaped lifting body 2 from moving up
When the rod-shaped elevating body 2 descends from this state, the swinging piece 18 swings, and the main locked portion 20 engages with the uppermost projection 10A of the main locking portion 11 and The sub-locked portion 23 is disengaged from the sub-lock portion 16 and the rod-shaped elevating body 2
Is allowed to rise.

More specifically, in implementing the apparatus of the present invention having the above-described structure, the main locking portion 20 is also used as a cylindrical pin that protrudes from the swinging piece 18 and locks one end of the spring 22. Can be done.

The main locking portion 11 is formed on one side of the elongated hole 9 provided in the fixed guide member 1 in the vertical direction, and the locking releasing guide portion 13 and the locking returning guide portion are provided. 14 is
The sub-locking portion 16 is formed by the oblique sides of the upper end and the lower end of the long hole 9, and the lower side of the inverted L-shaped tongue 15 formed to be bent inward at the upper end side of the long hole 9. Can be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
Is a fixed guide member vertically attached to a furniture body or the like, and 2 is a rod-shaped elevating body supported by the fixed guide member 1 so as to be able to ascend and descend, and an upper end supports an elevating member such as a top plate. The horizontal member 3 is mounted in a T-shape. The fixed guide member 1 is made of a metal having a hat-shaped cross section in which mounting plates 4 projecting outward from both left and right sides of the channel member are connected to each other. Caps 5 and 6 made of a synthetic resin are fitted inside and are fixed by screws 7. The rod-shaped elevating body 2 uses a metal channel formed in the opposite direction to the fixed guide member 1 and is vertically penetrated through U-shaped through holes provided in the caps 5 and 6. It is fitted inside the groove of the fixed guide member 1.

On the front plate portion 1a of the fixed guide member 1, a recessed portion 8 which is slightly lowered so as to enter the inside of the fixed guide member 1 is formed on almost the entire surface except for an appropriate region on the upper end side. An elongated hole 9 in the vertical direction is formed in the concave portion 8. On one side of the elongated hole 9, a rack gear-shaped main locking portion 11 in which saw blade-shaped protrusions 10 whose upper side is substantially horizontal and whose lower side is oblique is arranged at appropriate intervals in the vertical direction is formed. At the upper end of the main locking portion 11, a lock release formed by the oblique side of the upper end of the elongated hole 9, which is inclined obliquely upward from the side of the main locking portion 11 toward the opposite vertical side 12. Guide portion 13 is provided at a lower end of the main locking portion 11, and a locking return guide portion formed by a hypotenuse that slopes obliquely downward from the lower end of the vertical side 12 toward the main locking portion 11. 14 are provided.

Furthermore, between the uppermost projection 10A of the main locking portion 11 and the unlocking guide portion 13, it enters into the opposite side to the side having the vertical side 12 with respect to the uppermost projection 10A. At the position, a sub-locking portion 16 formed by cutting the front plate portion 1a of the fixed guide member 1 so as to be bent inward and formed in the lower side of the inverted L-shaped tongue piece 15, which is curved upward and recessed. Is provided.

In the groove of the rod-shaped elevating body 2, a cantilevered horizontal support whose inner end is fixed at a position close to the vertical side 12 of the elongated hole 9 on the fixed guide member 1 side at an intermediate height thereof. The swinging piece 18 is pivotally supported by the shaft 17 so as to be able to swing right and left.
A spring locking projection 19 made of a cut-and-raised tongue is formed just above the pivot support end of the swinging piece 18. In the vicinity of the free end of the oscillating piece 18, a main locked portion 20 composed of a cylindrical pin protruding toward the front plate 1a of the fixed guide member 1 is provided, and a circle forming the main locked portion 20 is provided. The tension coil spring 2 is positioned between the pivot groove 18 and the front plate 1a of the fixed guide member 1 between the intermediate groove 21 of the columnar pin and the spring locking projection 19.
2 is stretched. Further, on the side of the rocking piece 18 farther from the horizontal support shaft 17 than the main locked portion 20, the inner side of the main locking portion 11 and the back side of the concave recessed portion 8 of the front plate portion 1 a of the fixed guide member 1. Are provided. The sub-locked portion 23 is composed of a cylindrical pin having one end fixed to the free end of the swinging piece 18.

The operation of the lifting device having the above structure will be described.
FIG. 1 shows that the rod-shaped elevating body 2 is at an intermediate position of a support level switching area S between a lowermost support level L of the main locking portion 11 on the fixed guide member 1 side and an uppermost support level U of the uppermost projection 10A. The state in which it is supported is shown. At this time, the rocking piece 18 is in a state where the main locked portion 20 is fitted into the upper entering corner of the protrusion 10 at an intermediate height of the main locking portion 11 and cannot swing to the left or right. And prevents the rod-shaped elevating body 2 from descending from the position.

When the rod-shaped elevating body 2 is locked by the main locking portion 11 of the fixed guide member 1 as described above, the spring 22 moves the main locking portion 11 more than the horizontal support shaft 17 of the swinging piece 18. Side, the rocking piece 18 is moved to its main locked portion 20
Are urged in the direction of engagement with the main locking portion 11. Therefore, when the bar-shaped elevating body 2 is pulled up from this state, the main locked portion 2 of the rocking piece 18 is
0 rises along the main locking portion 11, rises along the lower oblique side of the protrusion 10 immediately above, and moves to the upper protrusion 1.
0 will enter the upper corner. Even when the main locked portion 20 gets over the projection 10, the spring 22 is located closer to the main locking portion 11 than the horizontal support shaft 17 of the rocking piece 18, and the rocking piece 18 is attached to the main locked portion. The locking portion 20 urges in a direction in which the locking portion 20 engages with the main locking portion 11.

Therefore, when the bar-shaped elevating body 2 to be lifted is stopped at an appropriate height, the rod-shaped elevating body 2 is operated to push down a little, or the hand is released to lower the bar-shaped elevating body 2 by its own weight. The main locked portion 20 is fitted to the upper entry corner of the projection 10 of the main locking portion 11 immediately below the main locked portion 20, and the bar-shaped elevating body 2 is supported at that level. become.

When it is desired to support the bar-shaped elevating body 2 at the uppermost support level U by the uppermost projection 10A, the bar-shaped elevating body 2 is pulled up to the ascending limit. As a result, as shown in FIG. 3, the main locked portion 20 of the swinging piece 18 gets over the uppermost protrusion 10A.
Immediately after passing over, the sub-locked portion 23 of the swinging piece 18 comes into contact with the sub-lock portion 16 on the fixed guide member 1 upward.
In other words, the position of the sub locked portion 23 with respect to the swinging piece 18 and the fixed guide member 1 are set so that such an operation is performed.
The position of the side sub-locking portion 16 is determined.

As shown in FIG. 4A, the ascending and descending movement of the rod-shaped elevating body 2 after the sub-locked portion 23 of the swinging piece 18 comes into contact with the sub-locking portion 16 on the fixed guide member 1 upward. The sub-locked portion 23 is fitted into the deepest portion of the sub-locking portion 16 in the curved concave portion, and prevents the rod-shaped elevating body 2 from further rising. At this time, the main locked portion 20 of the rocking piece 18 is positioned obliquely upward and outward with respect to the uppermost protrusion 10A of the main locking portion 11, but the rocking piece 18 is mainly moved by the biasing force of the spring 22. Locking part 11
Since it is urged to swing to the side, the rod-shaped elevating body 2 is operated so as to slightly push down the rod-shaped elevating body 2 from the state in which the lifting of the rod-shaped elevating body 2 is prevented as described above, or the hand is released by its own weight. When the rod-shaped elevating body 2 is lowered, the swinging piece 18 is swung toward the main locking portion 11 by the urging force of the spring 22 as the rod-shaped elevating body 2 is lowered, so that as shown in FIG. The locking portion 20 automatically fits into the upper entry corner of the uppermost projection 10A of the main locking portion 11, and the bar-shaped lifting / lowering body 2 is supported by the uppermost support level U.

As described above, in the process of shifting from the state where the lifting of the rod-shaped elevating body 2 is prevented (FIG. 4A) to the state where the rod-shaped elevating body 2 is supported by the uppermost support level U (FIG. 4B). Due to the swinging movement of the swinging piece 18 caused by the urging force of the spring 22, the sub-locked portion 23 of the swinging piece 18 is released outward from the sub-locking portion 16 on the fixed guide member 1 side. Therefore, when the rod-shaped elevating body 2 is further raised from the state where the rod-shaped elevating body 2 is supported by the uppermost support level U (FIG. 4B), as shown in FIG. The stop portion 23 rises through the rear side of the sub-locking portion 16 (inverted L-shaped tongue piece 15), and the main locked portion 20 of the swinging piece 18 is moved from the upper entry corner of the uppermost projection 10A. Guide part 13 for unlocking away from above (oblique side of upper end of long hole 9)
Will move up along.

As the main locked portion 20 of the rocking piece 18 moves upward along the unlocking guide 13 (the upper oblique side of the elongated hole 9), the rocking piece 18 Swings in a direction away from the main locking portion 11, and when the main locked portion 20 arrives at an entry corner between the unlocking guide portion 13 and the vertical side 12 of the elongated hole 9, That is, when the rod-shaped elevating body 2 reaches the ascending limit, as shown in FIG. 5A, the spring 22 biasing the swinging piece 18 is moved from the center of the horizontal support shaft 17 to the elongated hole 9.
The swinging piece 18 swings to a position displaced toward the vertical side 12 of the swing arm. In other words, the position of the horizontal support shaft 17 that supports the swinging piece 18 and the position of the spring locking projection 19 are determined so as to achieve such a state.

Therefore, when the rod-shaped lifting body 2 is lifted to the upper limit as described above, and the rod-shaped lifting body 2 is lowered, as shown in FIG. 20 descends while maintaining the retracted position (the position not engaged with the main locking portion 11) in contact with the vertical side 12 of the elongated hole 9. Immediately before the rod-shaped lifting and lowering body 2 reaches the lowering limit, the main locked portion 20 of the swinging piece 18 is connected to the vertical side 12 of the elongated hole 9.
And the main locked portion 20 moves along the locking / returning guide 14 as the rod-shaped lifting / lowering body 2 descends. The rocking piece 18 is rocked in a direction approaching the main locking portion 11. Thus, as shown in FIG. 6, when the swinging piece 18 reaches the lower end of the locking / returning guide portion 14, further lowering of the rod-shaped elevating body 2 is prevented, and the rod-shaped elevating body 2 is supported at the lowermost position. This means that the level L has been reached. At this time, the spring 22 for urging the swinging piece 18 is attached to the main locking portion 1 with respect to the horizontal support shaft 17.
1 and urges the rocking piece 18 toward the main locking portion 11, so that the rocking piece 18 is a source in which the main locked portion 20 is engaged with the main locking portion 11. Return to the working posture.

By lowering the rod-shaped elevating body 2 to the lower limit as described above, the rod-shaped elevating body 2 is supported at the lowest support level L. In this state, the rod-shaped elevating body 2 is supported.
As shown in FIG. 1, the rod-shaped lifting / lowering body 2 is moved by the engagement between the main locked portion 20 of the swinging piece 18 and the projections 10 of the main locking portion 11 in the operating posture. The main locked portion 20 can be supported at any intermediate level that fits into the upper entry corner of any protrusion 10.

[0021]

The lifting device according to the present invention can be implemented and used as described above. According to the lifting device according to the present invention, a bar-shaped lifting member for supporting a furniture top plate or the like can be used. With the auxiliary guide part attached to the furniture main body, etc., the sub-locking part and the sub-locked part of the swinging piece come into contact with each other and are raised to a level where they cannot be lifted. The main locked portion of the swinging piece is securely engaged with the upper side of the uppermost projection of the main locking portion, and the rod-shaped lifting body 2 can be supported at the highest support level. In other words, the operation for supporting the bar-shaped elevating body at the highest support level using the uppermost projection of the rack gear-shaped main locking part is as simple as raising the bar-shaped elevating body to the limit at which the lifting is prevented and slightly lowering it. Thus, the rod-shaped elevating body can be easily and reliably supported at the uppermost support level.

Further, from the state in which the rod-shaped elevating body is supported at the uppermost support level, the rod-shaped elevating body 2 is pulled up to the ascending limit to engage the main locking portion with the main locked portion of the rocking piece. Can be released, that is, the operation of switching the rod-shaped elevating body to a state in which it can be freely lowered can be performed in the same manner as in the prior art.

According to the second aspect of the present invention, the main locking portion on the swinging piece to be engaged with the main locking portion and the one-end locking member of the spring for biasing the rocking piece. It is possible to use both of them, and it is possible to reduce the number of parts and reduce the cost as compared with the case where both are composed of separate members.

According to the third aspect of the present invention, a special component can be formed by simply forming a long hole of a predetermined shape in the plate member of the fixed guide member and cutting and raising the inverted L-shaped tongue. The main lock, lock release guide, lock return guide, and sub-lock can be configured without adding any additional components, simplifying the configuration and further reducing costs. I can plan.

[Brief description of the drawings]

FIG. 1A is a partially cutaway front view showing an embodiment of an elevating device according to the present invention, and FIG. 1B is an enlarged sectional view taken along line XX of FIG.

FIG. 2 is an enlarged cross-sectional plan view of a main part of FIG. 1A.

FIG. 3 is a front view of a main part in a state where the rod-shaped elevating body is raised to a position immediately before being prevented from being raised.

FIG. 4A is a front view of a main part in a state where the lifting is prevented, and FIG. 4B is a front view of a main part in a state where the rod-shaped elevating body is supported at the uppermost support level.

FIG. 5A is a front view of a main part in a state where the rod-shaped lifting / lowering body at the uppermost support level is pulled up to a lifting limit, and FIG.
The figure is a front view of a main part in the middle of lowering the rod-shaped elevating body from the ascending limit.

FIG. 6 is a front view of a main part in a state where the rod-shaped elevating body has reached a lower limit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed guide member 2 Rod-shaped elevating body 9 Elongated hole 10 Projection of main locking part 10A Top projection 11 Rack gear-shaped main locking part 12 Vertical side of long hole 13 Lock release guide part 14 Lock release Guide portion 15 Inverted L-shaped tongue piece 16 Sub-locking portion 17 Horizontal support shaft 18 Swinging piece 20 Main locked portion 22 Spring 23 Secondary locked portion

Claims (3)

[Claims] 1. A bar-shaped elevating member attached to an elevating member such as a top plate, and a fixed guide member attached to a furniture body or the like and guiding the bar-shaped elevating member so as to be able to move up and down. A main locking portion in the direction of a rack gear is provided, and the rod-shaped lifting member is provided with a main locked portion that engages with the main locking portion so as to allow the lifting of the rod-shaped lifting member but prevent the lowering thereof. The swinging piece and the swinging piece are moved to an operation position where the main locked portion engages with the main locking portion and a retracted position where the main locked portion does not engage with the main locking portion. A spring that is switchably urged is provided, and an unlocking guide portion that switches the rocking piece from the operating position to the retracted position with the rise of the rod-shaped elevating body is provided continuously at the upper end of the main locking portion. At the lower end of the main locking portion, a swinging piece in a retreating posture is operated with the lowering of the rod-shaped elevating body. A lifting / lowering device provided with a locking / returning guide portion for returning to the swinging piece, wherein the rocking piece is engaged with the main locking portion on a side farther from the horizontal support shaft than the main locked portion. When the main locked portion climbs over the uppermost projection of the main locking portion upward, the fixed guide member is provided with the rod-shaped lifting / lowering body via the sub locked portion. A sub-locking portion for preventing the ascending is provided, and when the rod-shaped elevating body is lowered from this state, the rocking piece is rocked, and the main locked portion is engaged with the uppermost protrusion of the main locking portion. A lifting and lowering device such as a furniture top plate, wherein the sub-locked portion is disengaged from the sub-locking portion while allowing the rod-shaped elevating body to rise. 2. The lifting device for a furniture top plate or the like according to claim 1, wherein said main locking portion is also provided with a cylindrical pin projecting from a swinging piece and locking one end of said spring. . 3. The locking device according to claim 1, wherein the main locking portion is formed on one side of a vertically elongated hole provided in the fixed guide member. Formed by the oblique sides of the upper end and the lower end of the elongated hole, the sub-locking portion is formed by the lower side of an inverted L-shaped tongue formed to be bent inward at the upper end side of the elongated hole; An elevator device such as the furniture top plate according to claim 1.