JPS6238967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a mechanism for adjusting the length of the legs of a desk, chair, or table.

Generally, when using a desk or chair, it is preferable that the height of the desk, chair, etc. can be arbitrarily adjusted depending on the height of the user and the purpose of use.

Therefore, conventionally, the legs of desks, chairs, etc. are formed from, for example, an outer cylinder and an inner cylinder that is slidably inserted into the outer cylinder, and a plurality of screw holes are formed in the inner cylinder at predetermined intervals. An adjustment bolt that is screwed into the screw hole is attached to the outer cylinder, and the length of the leg body can be adjusted as appropriate by selecting the screw hole into which the adjustment bolt is screwed.

However, with the structure described above, each time the length of the leg body is adjusted, the adjustment bolt must be unscrewed and removed from the threaded hole in the inner cylinder, and then the inner cylinder must be slid relative to the outer cylinder. Furthermore, it is necessary to align a suitably selected screw hole with the adjustment bolt and then screw the adjustment bolt again, which requires a lot of time and effort as a whole, resulting in poor work efficiency.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a leg length adjustment mechanism that allows the length of the leg to be adjusted with one touch and extremely easily.

The present invention will be described below based on embodiments shown in the drawings.

In FIGS. 1 to 4, A is a leg of the table, and the leg A is made up of a cylindrical outer cylinder 1 and a cylindrical inner cylinder 2 that is slidably inserted into the outer cylinder 1. The top plate 3 of the table is screwed to the upper end of the outer cylinder 1 via a bracket 30.

Reference numeral 4 denotes a rectangular lock plate that is loosely inserted and fixed into the outer cylinder 1, and the lock plate 4 includes:
A plurality of engaging portions 41 consisting of square holes in the length direction,
41... are formed at predetermined intervals, and a fixing piece 42 is integrally formed on the upper end of the lock plate 4,
By welding this fixing piece 42 to the inner peripheral surface of the upper end of the outer cylinder 1, the lock plate 4 is fixed to the outer cylinder 1, and the lock plate 4 can be loosely inserted into the inner cylinder 2. ing.

Reference numeral 5 denotes a support provided in the inner cylinder 2, and the support 5 includes a first support plate 51 extending along the inner peripheral surface of the inner cylinder 2 and an axial direction of the first support plate 51. a second support plate 52 extending from the center so as to oppose the lock plate 4;
A fixed piece 51a integrally formed on one end of the support plate 51
The support body 5 is fixed within the inner cylinder 2 by welding to the inner peripheral surface of the upper end portion of the inner cylinder 2.

The pivot 5 is attached to the second support plate 52 of the support body 5.
3, the lock pawl 6 is pivotally supported in a swingable manner, and one end of a spring 60 loosely inserted into the pivot shaft 53 is locked to the second support plate 52, and the other end is locked to the lock pawl 6, respectively. The resilient force of the spring 60 constantly urges the lock pawl 6 in the direction of engagement with the engaging portion 41 of the lock plate 4.

The lock pawl 6 is configured such that the inner cylinder 2 is connected to the outer cylinder 1.
It is designed to engage with the engaging portion 41 only in the direction in which the inner cylinder 2 is accommodated (upward direction in Figure 1), and in the direction in which the inner cylinder 2 protrudes from the outer cylinder 1 (downward direction in Figure 1). In contrast, a control surface 61 provided on the lock pawl 6 allows the lock pawl 6 to be disengaged from the engaging portion 41.

Therefore, the sliding of the inner cylinder 2 in the direction in which the inner cylinder 2 is housed with respect to the outer cylinder 1 is stopped by the engagement of the lock pawl 6 with the engaging portion 41, while the outer cylinder 1
The movement of the inner cylinder 2 in the direction in which it protrudes is caused by the engagement portion 41 of the lock pawl 6 via the control surface 61.
It can be slid freely because the engagement is cancelled.

On the other hand, a regulating body 7 having a regulating piece 72 for regulating the engagement of the lock pawl 6 with the engaging portion 41 is reciprocably attached to the support body 5, and the forward movement of the regulating body 7 locks the lock. By disengaging the pawl 6 from the engaging portion 41 and returning the regulating body 7, the lock pawl 6 is released.
is engaged with the engaging portion 41.

That is, in the embodiment shown in the figure, a first control piece 43 is freely attached and detached at the lower end of the lock plate 4 in the longitudinal direction, and a second control piece 44 is integrally provided at the upper end. By forming an elongated hole 71 in the support member 7 and inserting one end of the pivot shaft 53 into the elongated hole 71 and inserting a retaining ring 53a into the insertion end, the regulating body 7 is secured to the support member 5. It is installed so that it can reciprocate over a predetermined stroke.

At the end of the regulating body 7 on the lock plate side, there are provided a regulating piece 72 for regulating the engagement of the lock pawl 6 with the engaging part 41, a first abutting piece 73 that comes into contact with the first controlling piece 43, and A second abutment piece 74 that abuts the second control piece 44 is integrally provided, and as the inner cylinder 2 slides with respect to the outer cylinder 1, the first abutment piece 73
is brought into contact with the first control piece 43 or the second contact piece 74 is brought into contact with the second control piece 44, and the lock claw 6 and the engaging portion 41 are engaged with the regulating body 7 with respect to the support body 5. The lock claw 6 is configured to move forward to a restriction position where it is released, or to move back to an engagement position that allows the lock pawl 6 to engage with the engagement portion 41. Claw 6 and the engaging portion 4
1 to the regulating position where the regulating body 7 is released from engagement with 1.
The forward movement of the locking pawl 6 causes the locking pawl 6 to swing in the direction of retreating from the movement path of the regulating body 7 via the control surface 61, so that the locking pawl 6 is received by the inner surface of the regulating piece. At the same time, the regulating piece 72 is removed from the locking claw 6 by the return movement of the regulating body 7 to the engagement position where the locking claw 6 engages with the engaging portion 41. When the lock claw 6 is released, the lock claw 6 is urged toward the engaging portion 41.

Further, in the embodiment shown in the figure, a groove 72a having a curved cross section is provided on the inner surface of the regulating piece 72, and the groove 72a has a curved cross section.
By engaging the locking pawl 6 with the locking claw 2a, the regulating body 7 is prevented from inadvertently moving relative to the support body 5.

In the figure, reference numeral 11 indicates a through hole provided in the outer cylinder 1, and a mark (not shown) attached to the outer peripheral surface of the inner cylinder 2 through the through hole 11 can be inserted as appropriate according to the length adjustment of the leg body A. It can be confirmed.

Further, reference numeral 21 in the figure denotes a detent piece fixed to the inner circumferential surface of the upper end opening of the inner cylinder 2, and the detent piece 21
The inner tube 2 and the outer tube 1 are prevented from rotating relative to each other by contacting the lock plate 4 with the inner tube 2 and the outer tube 1.

The present invention has the above configuration. For example, when it is desired to further increase the length of the leg A from the state shown in FIG. ) by a predetermined amount to engage the lock pawl 6 with the desired engagement portion 41.

Next, when it is desired to shorten the length of the leg body A, by further pulling out the inner cylinder 2 with respect to the outer cylinder 1, the first contact piece 73 of the regulating body 7 locks into the lock plate 4.
After engaging with the first control piece 43 of the first control piece 43, the regulation body 7 moves forward by a predetermined stroke with respect to the support body 5, and as a result, the lock pawl 6 engages with the first control piece 43 of the regulation piece 72 through the control surface 61. It swings in the direction of retreating from the moving path (counterclockwise in FIG. 2), and the lock pawl 6 is held by the inner surface of the regulating piece 72 of the regulating body 7, and the engagement with the engaging portion 41 is released. (see FIG. 2), therefore, the inner tube 2 can slide in the housing direction (upward in FIG. 1) with respect to the outer tube 1.

Therefore, when the inner cylinder 2 is slid in the storing direction with respect to the outer cylinder 1, the second contact piece 7 of the regulating body 7 near the sliding end position as shown in FIG.
4 engages with the second control piece 44 of the lock plate 4, the regulating body 7 moves back by a predetermined stroke with respect to the support body 5, and as a result, the regulating piece 72 moves away from the lock pawl 6. In order to disengage, the lock claw 6 is urged in the direction of engagement with the engaging portion 41 by the resilient force of the spring 60.

Therefore, from this state, the inner cylinder 2 is replaced with the outer cylinder 1 again.
By appropriately pulling out the locking pawl 6 and engaging the locking claw 6 with an arbitrary engaging portion 41, the leg A can be immediately adjusted to a desired length.

In addition to the embodiments described above, the present invention may be constructed as shown in FIGS. 6 to 8.

That is, the outer cylinder 1 and the inner cylinder 2 are shaped like rectangular cylinders, and the lock plate 4 is fixed to the outer cylinder 1 while being disposed between the inner surface of the outer cylinder 1 and the outer surface of the inner cylinder 2. In addition, the first control piece 43 is also removably attached to the outer cylinder 1 while being disposed between the inner surface of the outer cylinder 1 and the inner surface of the inner cylinder 2.
The insertion hole 81 for the lock pawl 6 and the first and second contact pieces 73 are provided in the side wall facing the lock plate 4.
74 slide holes 82 are formed, and the insertion holes 81
The lock pawl 6 engages with the engaging portion 41 of the lock plate 4 through the slide hole 82, and the first and second contact pieces 73 and 74 engage with the first control piece 4 through the slide hole 82.
3 and a second control piece 44 formed integrally with the lock plate 4.

In the second embodiment, the lock plate 4 is formed with an engaging portion 41 to fix the lock plate 4 to the outer cylinder 1. A plurality of protruding protrusions may be integrally formed to form the engaging portion 41.

Further, in the above embodiment, the engaging portion 41 is provided on the outer cylinder 1, and the support body 5 on which the lock pawl 6 and the regulating body 7 are assembled is provided on the inner cylinder 2.
The engaging portion 41 may be provided on the inner tube 2 and the support body 5 may be provided on the outer tube 1.

As described above, the present invention is a length adjusting mechanism in which an inner cylinder is slidably inserted into an outer cylinder, and the outer cylinder and the inner cylinder are connected to one of the outer cylinder and the inner cylinder. A plurality of engaging portions are provided along the length direction, a support is provided on the other cylinder, and a lock pawl that engages with the engaging portion is pivotally supported on the support. ,
Further, a spring is provided between the lock pawl and the support body to constantly bias the lock pawl in a direction to engage with the engaging portion, and to restrict engagement of the lock pawl with the engaging portion. A regulating body having a regulating piece is attached to the support body so as to be reciprocally movable between an engagement position where the lock claw is engaged with the engagement portion and a regulation position where the engagement is released. The regulating body is brought into engagement position with respect to the support body by contacting first and second control pieces provided on the one cylinder side and on both sides of the engaging portion in the direction of the reciprocating movement of the regulating body. First and second contact pieces are provided for reciprocating between the locking member and the regulating position, and the locking claw is provided with first and second contact pieces that move the locking member back and forth from the engaging portion when the inner cylinder is extended with respect to the outer cylinder. Since a control surface is provided for swinging the locking pawl in the direction of retreating from the movement path of the regulating piece when the regulating piece is moved to the regulating position, the operation is extremely simple, for example, by simply sliding the inner cylinder relative to the outer cylinder as appropriate. This made it possible to instantly adjust the legs to the desired length.

[Brief explanation of the drawing]

The drawings show an embodiment of the adjustment mechanism according to the present invention, and FIGS. 1 to 3 are sectional views showing the operating state thereof, FIG. 4 is a sectional view taken along the line of FIG. 1, and FIG.
The figure is a side view of an adjustment mechanism in which the outer cylinder and inner cylinder are omitted, and Figures 6 to 8 show other embodiments.
The figure is a sectional view thereof, FIG. 7 is a side view with the outer cylinder and inner cylinder separated, and FIG. 8 is a sectional view taken along the line of FIG. 6. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 6... Lock claw, 2... Inner cylinder, 7... Regulator, 41... Engagement part, 5... Support body, 43... First control piece, 44... Second control piece, 73... First stopper. Piece, 74...
Second piece.

Claims (1)

[Claims] 1. A length adjusting mechanism in which an inner cylinder is slidably inserted into an outer cylinder, and a length adjustment mechanism is provided on one of the outer cylinder and the inner cylinder along the length direction of the outer cylinder and the inner cylinder. A support body is provided on the other cylinder, and a lock pawl that engages with the engaging portion is pivotably supported on the support body, and the lock pawl and the lock pawl are pivotably supported. A spring is provided between the support body and the lock pawl to constantly urge the lock pawl in a direction to engage the engaging portion, and a regulating piece is provided for restricting engagement of the lock pawl with the engaging portion. A regulating body is attached to the support body so that it can reciprocate between an engagement position that allows the lock pawl to engage with the engagement portion and a regulation position that releases the engagement, and the reciprocating movement of the regulation body the regulating body is brought into contact with first and second control pieces provided on the one cylinder side and on both sides of the engaging portion in the direction in which the regulating body is disposed in the engagement position and the regulating position with respect to the supporting body; While providing first and second contact pieces to be reciprocated,
The locking pawl is provided with a locking mechanism that disengages the locking pawl from the engaging portion when the inner cylinder extends relative to the outer cylinder, and moves the locking pawl away from the movement path of the regulating piece when the regulating body moves to the regulating position. A leg length adjustment mechanism characterized by having a control surface that swings in a retreating direction.