JP2023176693A - telescopic device - Google Patents

Abstract

To provide a telescopic device which is small in the number of part items, whose main component is formed of a simple shape, and which is easy in a layout and manufacturing, and high in productivity.SOLUTION: In a telescopic device, when a lock block 60 is pulled down to the lowest position, a lock ball 90 is brought into a lock state in a lock region of a position regulation recess via a control plate 80 for making one end part 81 abut on a first protrusion 51 of a lock bar 50, and when the lock block 60 is pushed down to a prescribed position after pulling it up to the prescribed position, the lock ball 90 is sandwiched between an engagement hole 54 of the lock bar 50 and a bottom face of the lock region in the position regulation recess, and the lock block 60 is brought into a lock state by a wedge effect. When the lock block 60 is pulled up to the highest position, the lock ball 90 is elastically held in a holding region in the position regulation recess via the control plate 80 for making the other end part 82 abut on a second protrusion 52 of the lock bar 50.SELECTED DRAWING: Figure 9

Description

The present invention relates to a telescoping device, such as a telescoping device that can be used for a height-adjustable side table.

Conventionally, as shown in FIGS. 1 to 3 of Patent Document 1, a telescoping device has conventionally included a lock plate having a plurality of engagement parts attached to an outer cylinder, and a lock plate that is pivotally supported by an inner cylinder and is attached to the inner cylinder. has a length adjustment mechanism including a lock claw that engages with the engaging portion of the lock plate only in the direction in which the inner cylinder is housed in the outer cylinder, and the inner cylinder is moved through the length adjustment mechanism. a leg body slidably inserted into the outer cylinder, a cap that closes the opening is fitted into an opening at one end of the outer cylinder, and the lock plate is detachably fixed to the cap; A leg body characterized in that the outer cylinder is provided with a locking part that fits between the cap and the lock plate and prevents the lock plate from leaving the outer cylinder (Patent Document 1) Reference) is disclosed.

Jitsukaisho 61-95330

However, the leg structure has a large number of parts, and the lock pawl 6, which is a main component, has a complicated shape that tends to cause stress concentration, so it is not easy to design and manufacture. In particular, since assembly work is time-consuming, there is a problem in that productivity is low.
In view of the above-mentioned problems, it is an object of the present invention to provide a telescoping device that has a small number of parts, the main components have simple shapes, is easy to design and manufacture, and has high productivity.

In order to solve the above problems, the telescopic device according to the present invention has the following features:
Outer cylinder body 20;
an inner cylindrical body 30 that is inserted into the outer cylindrical body 20 and is slidable along the longitudinal direction;
A first protrusion 51 is provided at one end and a second protrusion 52 is provided at the other end, and engagement holes 54 are provided at a predetermined pitch between the first protrusion 51 and the second protrusion 52. a lock bar 50 that is housed in the outer cylinder body 20 and fixed to the outer cylinder body 20 so as not to be displaced in the longitudinal direction;
It has a cross-sectional area that allows sliding movement within the outer cylinder body 20, and can be divided into a first block body 61 and a second block body 62, and the lock bar 50 is attached to the joint surface of the first block body 61. A lock block 60 having a guide groove 64 for guiding, and a position regulating recess 65 on the joint surface of the second block body 62, and is slidably attached to the lock bar 50;
a spring member 70 assembled within the position regulating recess 65 of the second block body 62;
It has a diameter that can be engaged with and disengaged from the engagement hole 54 of the lock bar 50, is housed in the position regulating recess 65 of the second block body 62, and is attached to the spring member 70 on the lock bar 50 side. consisting of a biased lock ball 90;
When the lock block 60 is pulled down to the lowest position, the lock ball 90 becomes locked in the lock region 65a of the position regulating recess 65 via the first protrusion 51 of the lock bar 50,
When the lock block 60 is pulled up to a predetermined position and then pushed down, the lock ball 90 is held between the engagement hole 54 of the lock bar 50 and the bottom surface of the lock area 65a in the position regulating recess 65, The lock block 60 is in a locked state due to the wedge effect,
When the lock block 60 is pulled up to the highest position, the lock ball 90 is elastically held in the holding area 65c in the position regulating recess 65 via the second protrusion 52 of the lock bar 50.

According to the present invention, by holding the lock ball between the engagement hole of the lock bar and the bottom surface of the positioning recess of the lock block, the lock block can be brought into a locked state by a wedge effect. Therefore, not only can the height be adjusted with fewer parts than in the conventional example, but there is no need for components with complicated shapes, which makes it easy to design and manufacture, and provides a highly productive telescoping device.

Other expansion and contraction devices according to the present invention include:
Outer cylinder body 20;
an inner cylindrical body 30 that is inserted into the outer cylindrical body 20 and is slidable along the longitudinal direction;
A first protrusion 51 is provided at one end and a second protrusion 52 is provided at the other end, and engagement holes 54 are provided at a predetermined pitch between the first protrusion 51 and the second protrusion 52. a lock bar 50 that is housed in the outer cylinder body 20 and fixed to the outer cylinder body 20 so as not to be displaced in the longitudinal direction;
It has a cross-sectional area that allows sliding movement within the outer cylinder body 20, and can be divided into a first block body 61 and a second block body 62, and the lock bar 50 is attached to the joint surface of the first block body 61. A lock block 60 having a guide groove 64 for guiding, and a position regulating recess 65 on the joint surface of the second block body 62, and is slidably attached to the lock bar 50;
a spring member 70 assembled within the position regulating recess 65 of the second block body 62;
It has a diameter that can be engaged with and disengaged from the engagement hole 54 of the lock bar 50, is housed in the position regulating recess 65 of the second block body 62, and is attached to the spring member 70 on the lock bar 50 side. consisting of a biased lock ball 90;
When the lock block 60 is pulled down to the lowest position, the lock ball 90 is locked in the lock area 65a of the position regulating recess 65 via the control plate 80 whose one end 81 is in contact with the first protrusion 51 of the lock bar 50. state,
When the lock block 60 is pulled up to a predetermined position and then pushed down, the lock ball 90 is held between the engagement hole 54 of the lock bar 50 and the bottom surface of the lock area 65a in the position regulating recess 65, The lock block 60 is in a locked state due to the wedge effect,
When the lock block 60 is pulled up to the highest position, the lock ball 90 is held in the holding area 65c in the position regulating recess 65 via the control plate 80 whose other end 82 contacts the second protrusion 52 of the lock bar 50. It may also be configured such that it is elastically held.

According to the present invention, the height can be adjusted by regulating the position of the lock ball via the control plate. The same effects as those described above can be obtained.
In particular, since the position of the lock ball can be regulated via the control plate, the positioning accuracy with respect to the lock ball is increased, variations in operating characteristics are reduced, and reliability is improved.

In another embodiment of the present invention, the lock ball 90 may be elastically held by a pair of spring portions 66, 66 provided to face each other in the holding area 65c.
According to this embodiment, since the lock ball is held between both sides by the pair of spring parts, the holding strength is improved.

In another embodiment of the present invention, positioning portions 66a, 66a with which the lock ball 90 can engage and disengage may be provided at opposing positions of the pair of spring portions 66, 66, respectively.
According to the present embodiment, since the lock balls are engaged with and detachable from the pair of positioning holes, it is possible to obtain a telescopic device with small variations in operating characteristics.

FIG. 1 is a perspective view of a side table to which the first embodiment of the present invention is applied. FIG. 2 is a front view of the side table shown in FIG. 1. FIG. FIG. 2 is a left side view of the side table shown in FIG. 1. FIG. FIG. 2 is a left side view showing the side table shown in FIG. 1 in a state where the support (extension device) is extended. FIG. 2 is a perspective view of the side table shown in FIG. 1 viewed from below. FIG. 2 is a perspective view of a modified example of the side table shown in FIG. 1 viewed from below. This is the right side of the side table shown in FIG. 6. 7 is a perspective view showing main components of the side table shown in FIG. 6. FIG. FIG. 2 is an exploded perspective view of a single telescoping device (post) of the side table shown in FIG. 1; FIG. 2 is an exploded perspective view of the telescoping device shown in FIG. 1 viewed from a different angle. FIG. 2 is a cross-sectional view of the single telescopic device shown in FIG. 1; FIG. 2 is a perspective view showing the arrangement of main components of the telescoping device shown in FIG. 1. FIG. FIG. 2 is a perspective view of the arrangement of main components of the telescoping device shown in FIG. 1, viewed from a different perspective. 11 is a perspective view of the second block body shown in FIG. 10. FIG. 11 is a cross-sectional view for explaining the operation of the lock ball shown in FIG. 10. FIG. FIG. 2 is a partially sectional perspective view for explaining the operation of the expansion and contraction device shown in FIG. 1. FIG. FIG. 17 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 16; FIG. 18 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 17; FIG. 19 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 18; FIG. 20 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 19; It is an exploded perspective view of a single telescopic device according to a second embodiment of the present invention. FIG. 22 is an exploded perspective view of the single telescopic device shown in FIG. 21 viewed from a different perspective. FIG. 22 is a partially sectional perspective view showing the arrangement of main components of the telescopic device shown in FIG. 21; FIG. 22 is a partially sectional perspective view of the arrangement of main components of the telescopic device shown in FIG. 21, viewed from a different perspective. FIG. 22 is a partially sectional perspective view for explaining the operation of the expansion and contraction device shown in FIG. 21; FIG. 26 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 25; FIG. 27 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 26; FIG. 28 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 27; FIG. 29 is a partially sectional perspective view for explaining the operation of the expansion and contraction device following FIG. 28;

Embodiments according to the present invention will be described with reference to the accompanying drawings of FIGS. 1 to 29.
The first embodiment is applied to the side table shown in FIGS. 1 to 5.
The side table has a table plate 13 attached to a telescoping device 11, which is a support provided on a pedestal 10, via a mounting bracket 12 that is substantially rectangular in plan view.

Note that the side table to which the present invention is applied is not limited to the above-mentioned side table; for example, as shown in FIGS. 6 to 8, a mounting bracket 12 that is circular in plan view may be used, and the shape of the mounting bracket may be It is not particularly limited.

As shown in FIGS. 9 to 11, the telescopic device 11 includes an outer cylinder 20, an inner cylinder 30, a fixed block 40, a lock bar 50, a lock block 60, a spring member 70, and a lock ball 90. and a control board 80.

As shown in FIGS. 9 to 11, the outer cylindrical body 20 has a polygonal cross section in which an inner cylindrical body 30, which will be described later, can be slidably housed therein. A fixing block 40, which will be described later, is fixed to the lower end of the outer cylinder 20. Further, the outer cylinder body 20 is equipped with an annular guide cap 24 that can be divided into two and guides an inner cylinder body 30, which will be described later, at its upper end opening.

As shown in FIGS. 9 to 11, the inner cylindrical body 30 has a cross-sectional shape that is slidable along the inner circumferential surface of the outer cylindrical body 20, and has retaining holes 31 at opposing positions at its lower end. is provided.

As shown in FIGS. 9 to 11, the fixed block 40 has a cross-sectional shape that can be accommodated within the outer cylindrical body 20. Further, the fixed block 40 is provided along its axis with an insertion groove 41 (see FIG. 17) having a substantially Π-shaped cross section into which a lower end portion of a lock bar 50, which will be described later, can be inserted. The insertion groove 41 communicates with a through hole 42 for inserting the screw 22 that prevents the lock bar 50 from coming off. Note that the fixed block 40 may have a shape that can be divided into two.

As shown in FIGS. 9 to 11, the lock bar 50 is a bar member having a substantially Π-shaped cross section (see FIG. 11), and has a first protrusion 51 cut near one end (lower end) for regulating the position. On the other hand, a second protrusion 52 for regulating the position is cut and raised at the other end (upper end). A through hole 53 is provided near one end of the first protrusion 51 . Furthermore, engagement holes 54 are provided between the first protrusion 51 and the second protrusion 52 at a predetermined pitch. Note that the lock bar 50 may be, for example, a flat bar with a rectangular cross section.

As shown in FIGS. 9 to 11, the lock block 60 has an outer circumferential shape that can be stored in the outer cylindrical body 20, and can be divided into a first block body 61 and a second block body 62. Further, the lock block 60 includes a fitting receiving portion 63 on its upper end surface into which the lower end portion of the inner cylinder 30 can be fitted. The fitting receiving portion 63 has retaining protrusions 63a protruding from opposing positions on its inner peripheral surface (FIG. 13).

As shown in FIG. 11, the first block body 61 has a pair of guide grooves 64, 64 formed in parallel on the joint surface with the second block body 62 to slidably guide the lock bar 50. be.

As shown in FIG. 14, the second block body 62 has a position regulating recess 65 formed in the center of its joint surface along the axial direction. The position regulating recess 65 is provided on the same straight line so as to communicate with the lock area 65a, the loose fit area 65b, and the holding area 65c.
As shown in FIG. 15, the lock region 65a has a shallow bottom shape, and holds the lock ball 90 (shown by dotted lines in FIG. 15) engaged with the engagement hole 54 of the lock bar 50 with a wedge effect. Therefore, the downward sliding movement of the lock block 60 is restricted, and the height of the table plate 13 can be adjusted.
The loose fit area 65b is a space area that holds the lock ball 90 in a rollable manner. However, since the lock ball 90 is urged toward the lock bar 50 by the elastic arm portion 72 of the spring member 70, no rattling occurs.
As shown in FIG. 14, the holding area 65c has spring parts 66 each provided with a positioning part 66a on both sides thereof. Therefore, the lock balls 90 engaged with the positioning parts 66a, 66a are elastically held by the spring parts 66, 66. This embodiment has the advantage that by engaging with the positioning part 66a provided on the spring part 66, the lock ball 90 can be accurately positioned at a desired position with high positioning accuracy. Note that the positioning portion 66a is not limited to a through hole, and may be a simple recess.

Further, as shown in FIG. 14, the second block body 62 has a slit into which a spring member 70 can be inserted along the bottom surface of the position regulating recess 65 from the lower end surface of the second block body 62 toward the loose fitting region 65b. 67 is formed. The elastic arms 72, 72 of the spring member 70 press against the lock ball 90 and urge it toward the lock bar 50.

Furthermore, a guide slit 68 is formed in the second block body 62 along the bottom surface of the position regulating recess 65 from the bottom surface of the fitting receiving portion 63a of the second block body 62 toward the holding area 65c. A control plate 80, which will be described later, is slidably fitted into the guide slit 68.
Therefore, the lock ball 90 moves and is held within the position regulating recess 65 while being controlled in position via the spring member 70 and the control plate 80 attached to the second block body 62.

The spring member 70 forms an engaging portion 71 and a pair of elastic arm portions 72, 72 by bending a rod-shaped spring material into a substantially U-shape in a plan view and then into a substantially L-shape in a side view. It has been done.
The spring member 70 is press-fitted into the slit 67 provided in the second block body 62 to constantly urge the lock ball 90 toward the lock bar 50 side. Therefore, the spring member 70 prevents the lock ball 90 from falling off due to its own weight when it engages with the engagement hole 54 so that the lock block 60 moves smoothly.

The control plate 80 is a plate-shaped body in which a substantially Π-shaped control portion 83 is integrally formed between one end portion 81 and the other end portion 82 located on the same straight line. The control section 83 has a size and shape that allows the lock ball 90 to be accommodated in a rollable manner.
Further, the control plate 80 is slidably inserted into the guide slit 68 provided in the second block body 62 by the control section 83, and slides along the surface of the lock bar 50. The one end 81 and the other end 82 of the control plate 80 can alternately protrude from the bottom surface of the fitting receiving portion 63 of the lock block 60 and the lower end surface of the lock block 60, respectively.

The lock ball 90 is spherical and is housed in a position regulating recess 65 formed in the second block body 62 of the lock block 60 that can be divided into two. The lock ball 90 then rolls along the surface of the lock bar 50 via the spring member 70 and the control plate 80, and repeatedly engages and disengages from the engagement hole 54.

The procedure for assembling the above-mentioned components will be explained.
First, the spring member 70 is assembled into the slit 67 provided in the second block body 62 of the lock block 60, and then the control plate 80 is inserted into the guide slit 68. Then, the lock ball 90 is engaged with the positioning parts 66a, 66a of the spring parts 66, 66 located in the holding area 65c of the position regulating recess 65, and is elastically held. Then, the inner cylinder body 30 is assembled to the fitting receiving portion 63 of the second block body 62, and the retaining hole 31 is engaged with the retaining projection 63a. Furthermore, the lock bar 50 is positioned on the second block body 62, and then the first block body 61 is assembled.

Furthermore, the lower end of the lock bar 50 is inserted into the insertion groove 41 of the fixed block 40, which has a substantially Π-shaped cross section, to perform temporary assembly. Then, the inner cylinder 30 and the like are inserted and assembled into the outer cylinder 20, and the fixing block 40 is positioned at the lower end of the outer cylinder 20. Next, the screw 22 is inserted into the through hole 21 of the outer cylinder 20 and the through hole 42 of the fixed block 40, and the screw 22 is screwed into the nut 23, thereby fixing the fixed block 40 to the outer cylinder 20. Then, by attaching the guide cap 24 to the upper opening of the outer cylinder 20, the assembly work is completed.

Next, a method for adjusting the height of the table plate 13 will be explained.
As shown in FIG. 16, when the inner cylindrical body 30 is pulled down to the lowest end, one end 81 of the control plate 80 comes into contact with the first protrusion 51 of the lock bar 50 and slides within the guide slit 68. The lower end surface of 60 is closest to the upper end surface of fixed block 40. Therefore, the control plate 80 is pushed up relatively, and the control section 83 pushes up the lock ball 90 that is elastically held between the spring sections 66 and 66. As a result, the lock ball 90 separates from the holding area 65c and moves from the loose fit area 65b to the lock area 65a.

Then, as shown in FIG. 17, when the inner cylindrical body 30 and the lock block 60 are pulled up, the lock ball 90 repeatedly engages and disengages from the engagement hole 54, and rises while emitting a clicking sound.

Then, for example, as shown in FIG. 18, after pulling up to a height at which the lock ball 90 engages with the second engagement hole 54 from the bottom, the lock block 60 is pushed down to apply downward force. As a result, the lock ball 90 located in the loose fit region 65b engages with the engagement hole 54 and comes into pressure contact with the bottom surface of the lock region 65a of the second block body 62 (see FIG. 15). Therefore, due to the wedge effect, the lock block 60 is in a locked state, and the downward movement of the lock block 60 is restricted. As a result, the table plate 13 can be held at a predetermined height and the height can be adjusted.

When performing a new height adjustment, the inner cylinder 30 is pulled up to the highest level, as shown in FIG. With this operation, the lock block 60 is also pulled up to the uppermost position, and the other end 82 of the control plate 80 comes into contact with the second protrusion 52 of the lock bar 50. Therefore, the control plate 80 relatively slides within the guide slit 68 of the lock block 60, and one end portion 81 protrudes from the lower end surface of the lock block 60. At this time, the control section 83 of the control plate 80 pushes down the lock ball 90 against the spring force of the spring member 70. Therefore, the lock ball 90 is pushed down from the loose fit area 65b into the holding area 65c. As a result, the lock ball 90 engages with the positioning portion 66a of the spring portion 66 and is elastically held between the spring portions 66, 66. Therefore, the lock block 60 is in the released state, and the inner cylinder 30 and the lock block 60 are movable in the reciprocating direction along the lock bar 50.

Next, by pushing down the inner cylindrical body 30, one end 81 of the control plate 80 is brought into contact with the first protrusion of the lock bar 50 (see FIG. 20). Furthermore, by pushing down the lock block 60, the lower end surface of the lock block 60 comes closest to the upper end surface of the fixed block 40, resulting in the same state as in FIG. 16 described above. Thereafter, the height of the table board 13 can be adjusted by performing the same operations as described above.

As shown in FIGS. 21 to 29, the second embodiment according to the present invention is almost the same as the telescopic device according to the first embodiment described above, and the major difference is that the control plate is eliminated. Therefore, the second block body 62 is not provided with a guide slit for guiding the control plate.

The outer cylindrical body 20 and the inner cylindrical body 30 are both cylindrical bodies having a circular cross section, as shown in FIGS. 21 and 22. Further, the fixed block 40 also has a circular cross section, and the other parts are substantially the same as those of the first embodiment described above, so the same parts are given the same numbers and the explanation will be omitted.

Next, a method for adjusting the height of the table plate 13 according to the second embodiment will be described.
As shown in FIG. 25, when the inner cylindrical body 30 is pulled down to the lowest end, the lower end surface of the lock block 60 approaches the upper end surface of the fixed block 40. At this time, the lock ball 90, which is elastically held between the spring parts 66 and 66, comes into contact with the first protrusion 51 of the lock bar 50 and is pushed up relatively. As a result, the lock ball 90 separates from the holding area 65c and moves from the loose fit area 65b to the lock area 65a.

Then, as shown in FIG. 26, when the inner cylindrical body 30 and the lock block 60 are pulled up, the lock ball 90 repeatedly engages and disengages from the engagement hole 54, and rises while emitting a clicking sound.

Then, for example, as shown in FIG. 27, after the lock block 60 is pulled up to a height at which the lock ball 90 engages with the second engagement hole 54 from the bottom, a force is applied downward to the lock block 60. . By this operation, the lock ball 90 located in the loose fit region 65b engages with the engagement hole 54 and comes into pressure contact with the bottom surface of the lock region 65a of the second block body 62. Therefore, due to the wedge effect, the lock block 60 is in a locked state, and movement of the lock block 60 downward is restricted. As a result, the table plate 13 can be held at a predetermined height and the height can be adjusted.

When performing a new height adjustment, the inner cylinder 30 is pulled up to the highest level, as shown in FIG. As a result, the lock bar 50 is also pulled up to the highest position. Therefore, the lock ball 90 comes into contact with the second protrusion 52 of the lock bar 50, and the lock ball 90 is pushed down against the spring force of the spring member 70. Therefore, the lock ball 90 moves from the loose fit area 65b into the holding area 65c. As a result, the lock ball 90 engages with the positioning portion 66a of the spring portion 66 and is elastically held between the spring portions 66, 66. Therefore, the lock block 60 is in the released state, and the inner cylinder 30 and the lock block 60 are movable in the reciprocating direction along the lock bar 50.

Furthermore, by pushing down the inner cylindrical body 30 and pushing down the lock block 60, the lock block 60 is brought closer to the fixed block 40, and the lock ball 90 is brought into contact with the first protrusion 51 (see FIG. 29). Then, by bringing the lower end surface of the lock block 60 closest to the upper end surface of the fixed block 40, the same state as in FIG. 25 described above is achieved. Thereafter, the height of the table board 13 can be adjusted by performing the same operations as described above.

Although the above-described embodiments have been described with respect to movement in the vertical direction for convenience of explanation, the movement is not necessarily limited to this. For example, it can also be used as a position adjustment device that slides the lock block along the horizontal direction or diagonal direction.

In the above-described embodiment, the case where the present invention is applied to a side table has been described, but the present invention is not necessarily limited to this, and it goes without saying that the present invention may be applied to, for example, the legs of a chair that requires height adjustment.

10 Pedestal 11 Expanding device (post)
12 Mounting bracket 13 Table plate 20 Outer cylinder 21 Through hole 22 Screw 23 Nut 24 Guide cap 30 Inner cylinder 31 Preventing hole 40 Fixed block 41 Insertion groove 42 Through hole 50 Lock bar 51 First protrusion 52 Second protrusion 53 Penetration Hole 54 Engagement hole 60 Lock block 61 First block body 62 Second block body 63 Fitting receiving part 63a Retaining protrusion 64 Guide groove 65 Position regulating recess 65a Lock area 65b Loose fit area 65c Holding area 66 Spring part 66a Positioning Part 67 Slit 68 Guide slit 70 Spring member 71 Engagement part 72 Elastic arm part 80 Control plate 81 One end part 82 Other end part 83 Control part 90 Lock ball

Claims (4)

Outer cylinder body 20;
an inner cylindrical body 30 that is inserted into the outer cylindrical body 20 and is slidable along the longitudinal direction;
A first protrusion 51 is provided at one end and a second protrusion 52 is provided at the other end, and engagement holes 54 are provided at a predetermined pitch between the first protrusion 51 and the second protrusion 52. a lock bar 50 that is housed in the outer cylinder body 20 and fixed to the outer cylinder body 20 so as not to be displaced in the longitudinal direction;
It has a cross-sectional area that allows sliding movement within the outer cylinder body 20, and can be divided into a first block body 61 and a second block body 62, and the lock bar 50 is attached to the joint surface of the first block body 61. A lock block 60 having a guide groove 64 for guiding, and a position regulating recess 65 on the joint surface of the second block body 62, and is slidably attached to the lock bar 50;
a spring member 70 assembled within the position regulating recess 65 of the second block body 62;
It has a diameter that can be engaged with and disengaged from the engagement hole 54 of the lock bar 50, is housed in the position regulating recess 65 of the second block body 62, and is attached to the spring member 70 on the lock bar 50 side. consisting of a biased lock ball 90;
When the lock block 60 is pulled down to the lowest position, the lock ball 90 becomes locked in the lock region 65a of the position regulating recess 65 via the first protrusion 51 of the lock bar 50,
When the lock block 60 is pulled up to a predetermined position and then pushed down, the lock ball 90 is held between the engagement hole 54 of the lock bar 50 and the bottom surface of the lock area 65a in the position regulating recess 65, The lock block 60 is in a locked state due to the wedge effect,
When the lock block 60 is pulled up to the highest position, the lock ball 90 is elastically held in the holding area 65c in the position regulating recess 65 via the second protrusion 52 of the lock bar 50. Device. Outer cylinder body 20;
an inner cylindrical body 30 that is inserted into the outer cylindrical body 20 and is slidable along the longitudinal direction;
A first protrusion 51 is provided at one end and a second protrusion 52 is provided at the other end, and engagement holes 54 are provided at a predetermined pitch between the first protrusion 51 and the second protrusion 52. a lock bar 50 that is housed in the outer cylinder body 20 and fixed to the outer cylinder body 20 so as not to be displaced in the longitudinal direction;
It has a cross-sectional area that allows sliding movement within the outer cylinder body 20, and can be divided into a first block body 61 and a second block body 62, and the lock bar 50 is attached to the joint surface of the first block body 61. A lock block 60 having a guide groove 64 for guiding, and a position regulating recess 65 on the joint surface of the second block body 62, and is slidably attached to the lock bar 50;
a spring member 70 assembled within the position regulating recess 65 of the second block body 62;
It has a diameter that can be engaged with and disengaged from the engagement hole 54 of the lock bar 50, is housed in the position regulating recess 65 of the second block body 62, and is attached to the spring member 70 on the lock bar 50 side. consisting of a biased lock ball 90;
When the lock block 60 is pulled down to the lowest position, the lock ball 90 is locked in the lock area 65a of the position regulating recess 65 via the control plate 80 whose one end 81 is in contact with the first protrusion 51 of the lock bar 50. state,
When the lock block 60 is pulled up to a predetermined position and then pushed down, the lock ball 90 is held between the engagement hole 54 of the lock bar 50 and the bottom surface of the lock area 65a in the position regulating recess 65, The lock block 60 is in a locked state due to the wedge effect,
When the lock block 60 is pulled up to the highest position, the lock ball 90 is held in the holding area 65c in the position regulating recess 65 via the control plate 80 whose other end 82 contacts the second protrusion 52 of the lock bar 50. 1. A telescoping device characterized by being elastically held in a. 3. The telescopic device according to claim 1, wherein the lock ball 90 is elastically held by a pair of spring portions 66, 66 provided to face each other in the holding area 65c. 4. The telescopic device according to claim 3, further comprising positioning portions 66a, 66a in which the lock ball 90 can engage and disengage, respectively, provided at opposing positions of the pair of spring portions 66, 66.

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