JP6771236B2 - Telescopic device - Google Patents

Description

The present invention relates to a telescopic device such as a ladder or a stepladder that can be expanded and contracted.

For example, in the telescopic device of the strut of the stepladder, a pair of telescopic bodies having a mantle body and an insert body stretchably inserted into the mantle body are connected by a crosspiece member at intervals, and the insert body is connected to each mantle body. A lock mechanism for fixing the lock mechanism at an expanded / contracted position and an operating member for unlocking the lock mechanism are provided, and an operating means for manually operating the pair of operating members at the same time is provided between the pair of operating members. There is something.

In this type of conventional telescopic device, a conductor such as a wire is connected to an unlocking lever (operating member) of a locking mechanism, passed through a tube from there, and stored in the back of a top plate for flexible operation. An operating means that is connected to the operating member of another locking mechanism that is opposed to the other operating member of the locking mechanism, which is passed through the lever and then another tube, and manually operates the pair of operating members at the same time. There is one that is composed of an operation lever housed on the back side of the plate and is operated by the user in a standing position while holding the stepper to unlock the pair of lock mechanisms at the same time (for example, Patent Document). 1).

Japanese Unexamined Patent Publication No. 2005-61033

However, in the past, a pair of lock mechanisms can be unlocked at the same time to easily expand and contract a pair of stretchable bodies such as columns, but only one lock mechanism can be unlocked and one stretchable body can be stretched and adjusted. Therefore, when there is an inclination or unevenness in the ground contact place such as a stepladder, it is not possible to easily adjust the expansion and contraction of only one of the elastic bodies, and the pair of elastic bodies have different lengths. It has been difficult to adjust the expansion and contraction so that it can be installed stably and quickly even in a place with inclination or unevenness.

In view of the above problems, it is an object of the present invention to provide an expansion / contraction device capable of locking and unlocking the lock mechanism in the vicinity of the upper tread member using a long tread member. ..

Specific means for solving the problem in the present invention are as follows.
The technical means of the present invention for solving this technical problem is a pair of left and right telescopic bodies 5 having a mantle 8 and an inserter 9 which is stretchably inserted into the mantle 8 and whose lower end can be grounded. , The upper, middle, and lower three-stage tread members 6 in which both ends in the longitudinal direction are connected to the facing surfaces of the outer body 8 of the left and right telescopic bodies 5 so as to face each other, and the inserts inserted into each outer body 8. A telescopic device including a lock mechanism 7 for fixing the 9 to the mantle 8 at a telescopic position, and an operating member 69 for locking and unlocking each lock mechanism 7.
Each of the lock mechanisms 7 is arranged in the vicinity of the connection position between the locked portion 11 provided on the insertion body 9 along the longitudinal direction, the mantle body 8 and the lower tread member 6, and is covered with the insertion body 9. It has a locking member 23 that engages with the locking portion 11 in a detachable manner.
The operating member 69 is arranged close to the facing surface of the mantle 8 and vertically movable along the longitudinal direction.
An insertion space 21 through which the operation member 69 is inserted is formed between the longitudinal end portion of the tread member 6 in the middle stage and the facing surface of the mantle body 8.
The operating member 69 extends to the vicinity of the connecting position between the mantle body 8 and the upper tread member 6, and an upper end portion to which a force for moving the operating member 69 up and down is applied is formed on the upper portion of the operating member 69. ,
The operating member 69 is located below the upper surface of the upper tread member 6 and along the upper tread member 6.
The point is that an operation stick 96 for applying a force for moving up and down is arranged at the upper end portion of the above.

Further, in another technical means of the present invention, the upper tread member 6 is provided with a recess which is open downward below the upper surface, and the operation stick 96 is operably arranged in this recess. At the point.
Further, in another technical means of the present invention, an interlocking portion 95 is provided at the end of the operating rod 96, and the interlocking portion 95 is engaged with the interlocking portion 95 in a disengaged manner to move the operation of the operating rod 96 up and down of the operating member 69. An engaging portion 94 that converts into motion is provided at the upper end portion of the operating member 69.

Further, another technical means of the present invention is an upper guide member that regulates the upper part of the operating member 69 from separating from the facing surface of the outer body 8 in the vicinity of the connecting position between the outer body 8 and the upper tread member 6. 76 is provided,
A lower guide member 77 that regulates the lower part of the operating member 69 from separating from the facing surface of the outer body 8 is provided in the lower part of the outer body 8.

Further, another technical means of the present invention is that a connecting body 82 is provided between the lower portion of the operating member 69 and the locking member 23 to engage and disengage the locking member 23 by moving the operating member 69 up and down. It is in.
Further, in another technical means of the present invention, each lock mechanism 7 includes a pivot shaft 24 that swingably supports the lock member 23, a spring 90 that urges the lock member 23 in a locking operation, and a spring 90. It has a handle 25 that swings the lock member 23 around the pivot shaft 24 against the spring 90.

Further, in another technical means of the present invention, each lock mechanism 7 is fixed to a pivot shaft 24 that swingably supports the lock member 23 and a facing surface of the mantle body 8, and the pivot shaft 24 is fixed. Has a support frame 18 and supports the
The upper end of the insertion body 9 is provided with a retaining member 15 that comes into contact with the support frame 18 and regulates the removal from the mantle 8.

According to the present invention, the locking operation and the unlocking operation of the lock mechanism can be performed in the vicinity of the upper tread member by using a long tread member.
Further, according to the present invention, the operating member 69 that locks and unlocks the lock mechanism 7 is arranged close to the facing surface of the mantle 8 and vertically movable along the longitudinal direction, and is arranged so as to be vertically movable along the longitudinal direction. It is inserted into the insertion space 21 between the longitudinal end of the member 6 and the facing surface of the outer body 8, extends to the vicinity of the connecting position between the outer body 8 and the upper tread member 6, and is extended to the upper part of the operating member 69. An upper end portion to which a force for moving the operation member 69 up and down is applied is formed, and further, up and down on the upper end portion of the operation member 69 at a position below the upper surface of the upper tread member 6 and along the upper tread member 6. Since the operation rod 96 for applying a force for moving is arranged, the operation member 69 can be operated in the vicinity of the upper tread member 6 to perform the lock operation and the unlock operation of the lock mechanism 7, and the operation can be performed. The member 69 can be protected and smoothly moved.

Further, according to the present invention, the upper tread member 6 is provided with a recess that is open downward below the upper surface, and the operation stick 96 is operably arranged in this recess. The operation member 69 can be moved up and down while touching the member 6.
Further, according to the present invention, an interlocking portion 95 is provided at the end of the operating rod 96, and is engaged with the interlocking portion 95 in a disengaged manner to convert the operation of the operating rod 96 into a vertical movement of the operating member 69. Since the engaging portion 94 is provided at the upper end portion of the operating member 69, the interlocking portion 95 is operated by engaging the engaging portion 94 with the engaging portion 94 from the disengaged state and disengaging from the engaged portion. The member 69 can be moved up and down, and the operation member 69 can be moved up and down while touching the upper tread member 6 at a position horizontally separated from the upper end portion of the operation member 69.

Further, according to the present invention, not only the insertion space 21 of the tread member 6 in the middle stage but also the upper guide member 76 and the lower guide member 77 are provided, so that the upper and lower parts of the operating member 69 face each other with the mantle body 8. It is possible to regulate the separation from the surface, and the operating member 69 can be protected and smoothly moved.
Further, according to the present invention, since the connecting body 82 that engages and disengages the lock member 23 by moving the operating member 69 up and down is provided between the lower portion of the operating member 69 and the lock member 23, the operating member 69 Can reliably transmit the vertical movement of the operating member 69 to the lock member 23 even when the lock member 23 is located along the mantle body 8 and away from the mantle body 8.

Further, according to the present invention, each lock mechanism 7 has a pivot shaft 24, a spring 90, and a handle 25 that swings the lock member 23 around the pivot shaft 24. Therefore, the lock member 23 Can be locked and unlocked in the vicinity of the lower tread member 6.
Further, according to the present invention, each lock mechanism 7 has a pivot shaft 24 and a support frame 18 that supports the pivot shaft 24, and a retaining member 15 is provided at the upper end of the insert body 9. Therefore, when the retaining member 15 comes into contact with the support frame 18, it is possible to prevent the inserter 9 from coming out of the mantle 8.

It is a partial cross-sectional front view of the stepladder which shows the 1st Embodiment of this invention. It is a perspective view of the support. It is a side view seen from the inside of the support. It is a front sectional view of the lower part of the support. It is a front sectional view of the lower part of a column in a state where the lock is released. It is a front sectional view of the upper part of the support. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 6 is a cross-sectional view taken along the line BB of FIG. It is an exploded perspective view of a lock member, a handle and the like. It is an exploded perspective view of a lower guide member, a connecting body, an interlocking tool and the like. It is a perspective view of the upper part of the support. It is an overall side view of a stepladder. It is an overall perspective view of the platform which shows the 2nd Embodiment of this invention. It is a perspective view of the upper part of the support. It is a perspective view of the upper part of the column which shows the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 12 show a first embodiment in which the telescopic device of the present invention is mounted on a stepladder. In FIGS. 1 and 12, the stepladder 1 is mainly configured by pivotally supporting the upper portions of a pair of ladders 2 arranged so as to face each other with a pin 4 via a bracket 3. This stepladder 1 can be used by leaning a pair of ladders 2 against a ground plane, and unlocks the opening stoppers that lock both ladders 2 so as not to open the pair of ladders 2. It can be used by rotating it around the pin 4.

The ladder 2 has a pair of struts 5 (expandable bodies) that are arranged at intervals on the left and right and can be expanded and contracted, a plurality of tread members (bar members) 6 that connect the left and right stanchions 5, and the stanchions 5 and treads. It has a lock mechanism 7 provided between the crosspiece member 6.
In the following description, for convenience of explanation, as shown in FIG. 1, the step ladder member 6 can be viewed from the front, and the direction in which the columns 5 are arranged in parallel (the left-right direction on the paper surface in FIG. 1) is defined as the left-right direction. As shown in 11, the parallel direction of the ladder 2 (the left-right direction on the paper surface of FIG. 11) is the front-back direction.

Each column 5 has a column body 8 (mantle body) formed of a channel material and a square tubular pedestal 9 (insertion body) inserted into the column body 8. The column 5 is expandable and contractible by sliding in the axial direction (vertical direction), and the pedestal 9 is fixed by the lock mechanism 7 so as not to be movable in the axial direction at a predetermined position expanded and contracted. There is.
In FIGS. 1 to 10, the support column body 8 is formed of a metal system such as aluminum in a substantially U-shape in cross section, and an opening groove 10 is formed in the longitudinal direction on the facing portion side of the support column body 8 facing the support column body 8. Is formed.

The pedestal 9 is formed of a metal material such as aluminum like the column main body 8, and a plurality of locked portions 11 (rack portions) are mounted on the side wall at a position corresponding to the opening groove 10 on the opposite side of the column main body 8. Is formed. A grounding member 12 is attached to the lower end of the pedestal 9, and the grounding member 12 allows the ladder 2 to ground to the grounding surface in a stable state. At the top, which is the insertion base of the pedestal 9,
A retaining member 15 that comes into contact with the support frame 18 of the lock mechanism 7, which will be described later, and prevents the pedestal 9 from coming off from the pillar main body 8 is provided so as to project outward from the opening groove 10.

As shown in FIG. 6, the retaining member 15 is detachably fixed to the pedestal 9 with a fixing tool 17 such as a bolt.
Of the stepping members 6 of the ladder 2, the lowermost stepping member 6 (6a) and the intermediate stepping member 6 (6b) are formed in a square tubular shape, and the upper and lower surfaces of these stepping members 6 are formed. Is inclined so as to move upward or downward from the front side to the rear side, and unevenness for slip prevention is formed on the inclined portion 16 on the upper surface side along the longitudinal direction thereof.

The tread member 6 (6b) at the intermediate portion of the ladder 2 is fixed between the left and right support main bodies 8 via plate-shaped brackets 14 mounted on the front and rear walls 13F and 13R of the support main body 8.
A pair of front and rear plate-shaped brackets 14 are arranged corresponding to the outer ends of the rivet members 6, and each bracket 14 has a support column fixing portion 14a and a rivet fixing portion 14b via a step portion 14c. The strut fixing portion 14a is fixed to the strut body 8 with a fixing tool 22 such as a rivet, and the tread fixing portion 14b is fixed to the outer end portion of the tread member 6 with a fixing tool 22 such as a rivet, and is shown in FIG. As described above, an insertion space 21 for the operation member 69, which will be described later, is formed between the outer surface of the support column main body 8 and the end portion of the tread member 6.

Of the stepping members 6 of the ladder 2, the uppermost stepping member 6 (6c) is formed in the shape of a side cross section having a concave groove 19 which opens downward.
The lock mechanism 7 is provided between the tread member 6a at the lowermost stage of the ladder 2 and the support column 5, and one lock mechanism 7 is provided for each support column 5, and the opposite surfaces of the left and right support column main bodies 8 are provided. The lock mechanism 7 is attached to the ladder.

The lock mechanism 7 is pivotally supported by a support frame 18 fixed to the support column body 8 and swingably in the left-right direction (direction a in FIGS. 4 and 5) with respect to the support frame 18, and is covered by the pedestal 9. The lock member 23 that engages with the locking portion 11, the pivot shaft 24 that swingably supports the lock member 23, and the lock member 23 that is supported by the pivot shaft 24 and swings apart from the pedestal 9 ( It has a handle 25 (which operates the lock member 23 to be released).

As will be described later, the lock member 23 is swingable in the left-right direction around the pivot shaft 24 supported by the support frame 18, and can be freely engaged with and disengaged from the pedestal 9 by swinging the lock member 23. You can do it.
Further, the lock mechanism 7 has an interlocking tool 27 movably supported on the support frame 18 at the lock position X and the unlock position Y shown in FIGS. 2, 4 and 5, and the lock member 23 and the interlocking tool. When the interlocking tool 27 moves to the lock position X, the lock member 23 is engaged with the pedestal 9, and when the interlocking tool 27 moves to the unlocking position Y, the lock member 23 is moved to the pedestal 9 When the interlocking means 29 and the interlocking tool 27 move to the lock position X, the locking member 23 is prevented from swinging apart, and when the interlocking tool 27 is disengaged from the lock position X, the locking member 23 is disengaged and swung. Withdrawal preventing means 30 is provided.

The support frame 18 is formed in a box shape by bending a single metal-based plate material such as aluminum, and can be attached to the column main body 8 and the tread member 6, and is attached to the column 9 side (column 5). The side) is open, and a pair of front and rear side wall portions 32F and 32R mounted on the front and rear walls 13F and 13R of the column main body 8 and extended to the facing portion side, and a locked portion of the pedestal 9 A pair of treads that face the 11 and are arranged between the front and rear side wall portions 32F and 32R, and a pair of treads that protrude downward from the lower part of the front and rear side wall portions 32F and 32R and are attached to the tread member 6. It has mounting portions 34F and 34R.

The outer side portions of the front and rear side wall portions 32F and 32R of the support frame 18 are formed so that the front and rear walls 13F and 13R of the support column main body 8 can be sandwiched. , 13R is sandwiched and fixtures 22 such as rivets are struck against them, so that the support frame 18 is attached to the support column main body 8.
The rivet mounting portions 34F and 34R of the support frame 18 are formed so as to be able to sandwich the end sides of the front and rear walls 26F and 26R of the rivet member 6, and the rivet mounting portions 34F and 34R are formed in front of and behind the rivet member 6. The support frame 18 is attached to the tread member 6 by sandwiching the end sides of the walls 26F and 26R and striking fixtures 22 such as rivets against them.

Therefore, the support frame 18 has a function of a bracket for connecting the tread member 6 to the support column 5, thereby reducing the number of brackets for attaching the treadle member 6 to the support column 5. it can.
When the support frame 18 is attached to the tread member 6, the inclined portion 16 on the upper surface side of the tread member 6 plunges into the support frame 18. The back wall portion 33 of the support frame 18 is formed in the shape of a vertical plate in the front-rear direction.

The pivot shaft 24 is formed in a columnar shape, is provided through the front and rear side wall portions 32F and 32R of the support frame 18, and is rotatably supported in the same direction as the swing direction of the lock member 23.
A retaining ring 37 having a diameter larger than that of the pivot shaft through hole 36R (one of the pivot shaft through holes 36F and 36R) of the rear side wall portion 32R is attached to the tip of the pivot shaft 24. When the support shaft 24 is pulled forward, the retaining ring 37 comes into contact with the rear side wall portion 32R to serve as a stopper, and the pivot shaft 24 is prevented from falling out of the through hole 36R for the pivot shaft.

As shown in FIGS. 3, 4, 5, and 9, the handle 25 includes a grip portion 41 and an actuating portion 42 protruding from the grip portion 41 toward the interlocking tool 27, and the grip portion 41 is a pivot shaft. It is fixed to one end (front end) of 24 by welding or the like, is arranged along the outer surface of the front side wall 32F, and connects the front side of the pivot shaft 24 and the operating portion 42. The operating portion 42 is formed in a columnar shape, and protrudes in the rear direction at a position radially separated from the pivot shaft 24. The pivot shaft 24, the grip portion 41, and the actuating portion 42 are formed in a substantially U-shape in side view.

The actuating portion 42 of the handle 25 is inserted through the actuating portion through hole 44 provided in the lower part of the front wall portion 32F of the support frame 18. The through hole 44 for the operating portion is formed in an arc shape centered on the axial center of the pivot shaft 24 (the center of the through holes 36F and 36R for the pivot shaft).
The grip portion 41 of the handle 25 integrally connects the pivot shaft 24 and the actuating portion 42. A synthetic resin handle cover 47 is externally fitted to the front portion of the grip portion 41 and the pivot shaft 24 and the front portion of the actuating portion 42, and the handle cover 47 is mounted on the front portion of the grip portion 41 and the pivot shaft 24 and the actuating portion. It covers the outer circumference of 42 with the front part. Left and right narrow knobs 48 are projected downward from the lower part of the handle cover 47.

The lock member 23 is arranged between the front and rear wall portions 32F and 32R of the support frame 18, and is arranged outside the pivot shaft mounting portion 49 mounted on the front and rear substantially central portion of the pivot shaft 24 and the operating portion 42. It has a swinging protrusion 51 and a locking portion 52 that engages with the locked portion 11 of the pedestal 9.
The pivot shaft mounting portion 49 of the lock member 23 is rotatably fitted to the pivot shaft 24, and the lock member 23 is swingably supported around the pivot shaft 24 in the left-right direction (a direction). ing. A pressing portion 54 is projected toward the interlocking tool 27 at the lower portion (free end side) of the lock member 23, and an operation piece 55 is projected inward at the pivot shaft mounting portion 49.

As shown in FIGS. 4, 5, and 10, the interlocking tool 27 has a back that connects the upper wall 27b that connects the pair of front and rear side walls 27a and the upper part of the front and rear side walls 27a and the inner end portion of the front and rear side walls 27a in the left-right direction. It is formed in a box shape having an opening on the outside side having a wall 27c, and is arranged so as to project upward in the lateral direction of the lock member 23 in the support frame 18, and is formed on the inner surface of the back wall portion 33 of the support frame 18. It is held so that it can slide (move) up and down along it. Therefore, the interlocking tool 27 of the left and right support frames 18 is movably held along the facing surfaces of the left and right support columns 8 in the longitudinal direction thereof.

A square cylinder 57 is projected outward from the upper part of the back wall 27c of the interlocking tool 27, the upper part of the square cylinder 57 is the first push piece 58, and the lower part is the second push piece 59. The first pushing piece 58 and the second pushing piece 59 are vertically separated from each other with the tip of the operating piece 55 sandwiched vertically. A regulation portion 60 is projected outward from the lower side of the square cylinder 57 of the back wall 27c, and a pair of front and rear cam walls 61 having arc-shaped cam surfaces 61a are provided on both front and rear sides of the regulation portion 60.

A pair of front and rear connecting pieces 62 are projected upward from the upper wall 27b of the interlocking tool 27, and each connecting piece 62 is provided with a mounting hole 63.
Thus, the interlocking means 29 includes an operation piece 55 projecting from the lock member 23, and a first pushing piece 58 and a second pushing piece 59 projecting from the interlocking tool 27, and the first pushing force 29. Piece 58 and 2nd push piece 5
The operation piece 55 is sandwiched between the 9 and the interlocking tool 27 in the moving direction of the interlocking tool 27, and when the interlocking tool 27 moves to the lock position X, the first pushing motion piece 58 operates to swing the lock member 23 in the engaging direction. The second pushing piece 59 is configured to push the operating piece 55 in order to push the piece 55 and swing the lock member 23 in the release direction when the interlocking tool 27 moves to the unlocking position Y. There is.

In the case of the present embodiment, when the interlocking tool 27 moves from the unlocking position Y to the locking position X, the regulating unit 60 first pushes the pressing unit 54 downward to move the locking member 23 in the engaging direction. After swinging, the first pushing piece 58 pushes the operating piece 55 downward, and when the interlocking tool 27 moves to the lock position X, the locking member 23 swings in the engaging direction. The movement is to be completed.

Further, the detachment preventing means 30 includes a pressing portion 54 projecting toward the interlocking tool 27 on the swinging end side of the lock member 23, and a regulating portion 60 projecting toward the pressing portion 54 on the interlocking tool 27. When the interlocking tool 27 moves to the lock position X, the pressing portion 54 and the restricting portion 60 face each other to prevent the lock member 23 from swinging apart, and the interlocking tool 27 is disengaged from the lock position X. The restricting portion 60 is configured to sometimes deviate from the position facing the pressing portion 54 to allow the locking member 23 to swing apart.

Further, in FIG. 4, when the interlocking tool 27 moves from the lock position X to the lock release position Y, the locking member 23 starts to swing apart after the regulating portion 60 is released from the pressing portion 54. As shown, an idle gap 65 is formed between the second pushing piece 59 and the operating piece 55.
By rotating the handle 25 around the pivot shaft 24 inward to the left and right in the direction of the arrow a, the interlocking tool 27 is pushed to the unlocked position Y against the urging of the urging member 91 described later. The tool pushing means 67 is provided between the grip portion 41 and the interlocking tool 27. The interlocking tool pushing means 67 is composed of an outer peripheral surface of the operating portion 42 and a cam surface 61a of the front and rear cam walls 61 of the interlocking tool 27.

As shown in FIGS. 2, 3, 6, 8, and 10, the operating member 69 for operating the lock member 23 moves up and down so as to close the opening groove 10 on the facing surface (outer surface) of the left and right column main bodies 8. Arranged in the direction. The operating member 69 is formed to be elongated in the vertical direction, and is movably held in the longitudinal direction along the facing surface (outer surface) of the support column main body 8, and is vertically movable and held in the insertion space 21. Has been done. The interlocking tool 27 is connected to the lower end (one end) of the operating member 69 via a connecting body 82 described later, whereby the operating member 69 is interlocked with the lock member 23. The upper part of the operating member 69 reaches the vicinity of the lower side of the uppermost tread member 6c.

The operation member 69 has a plate-shaped operation wall portion 69a long in the vertical direction and a pair of front and rear side wall portions 69b protruding outward from both front and rear ends of the operation wall portion 69a, and is located below the operation wall portion 69a. The upper locking hole 71 and the lower locking hole 72 are provided at a vertical interval, and these locking holes 71 and 72 are formed in a long rectangular shape in the front-rear direction.
The column main body 8 is provided with an upper guide member 76 and a lower guide member 77 that movably guide the operation member 69.

As shown in FIGS. 2, 3, 6, and 11, the upper guide member 76 includes a pair of front and rear side walls 76a and a pair of front and rear mounting walls 76b extending inward to the upper part of the front and rear side walls 76a. It has a horizontal plate-shaped upper connecting wall 76c connected to the upper part of the front-rear mounting wall 76b and a vertical plate-shaped lower connecting wall 76d connected to the lower part of the front-rear side wall 76a, and the front-rear side wall 76a is a rivet or the like. By striking the fixture 22, it is fixed to the front and rear side walls 13F and 13R of the column main body 8. The left and right ends of the uppermost tread member 6c are fitted inward between the upper connecting wall 76c and the front / rear mounting wall 76b, and are fixed to the front / rear mounting wall 76b with a fixture 22 such as a rivet.

As shown in FIGS. 2, 3 and 10, the lower guide member 77 protrudes inward from the pair of front and rear side walls 77a, the back wall 77b connecting the inner ends of the front and rear side walls 77a, and the back wall 77b. It has a pair of front and rear storage side walls 77c, and an upper spring receiving wall 79 projecting inward from the upper part of the back wall 77b so as to close between the upper parts of the storage side wall 77c.
A step portion 80 is provided in the middle of the front-rear side wall 77a in the left-right direction, an engaging piece 81 is projected inward in the front-rear direction inward of the step portion 80, and the outer portion of the front-rear side wall 77a is a rivet. By striking a fixture 22 such as, etc., it is fixed to the front and rear side walls 13F and 13R of the support column main body 8, and the front and rear ends of the operating member 69 are movably sandwiched between the step portion 80 and the engaging piece 81. ing.

As shown in FIGS. 2, 3, 4, 5, and 10, a connecting body 82 is provided between the interlocking tool 27 and one end of the operating member 69. The connecting body 82 has a front wall 82a and a back wall 82b on the left and right sides, the back wall 82b projects upward from the front wall 82a, and the upper wall 82c projects inward from the upper part of the back wall 82b. On the outer side of the upper wall 82c, an upper engaging piece 83 bent in a stepwise manner upward and outward is provided. A bottom wall 82d that connects the lower part of the back wall 82b and the lower part of the front wall 82a is provided, a cylindrical connecting cylinder 85 is provided between the back wall 82b and the bottom wall 82d, and the upper part and the back of the front wall 82a are provided. A lower spring receiving wall 86 for connecting the intermediate portion of the wall 82b is provided, and a connecting wall 82e for connecting the front wall 82a, the back wall 82b, the bottom wall 82d, and the lower spring receiving wall 86 is provided. A lower engaging piece 84 is projected outward from the upper part of the front wall 82a in a hook shape.

By engaging the upper engaging piece 83 with the upper locking hole 71 of the operating member 69 in a detachable manner and engaging the lower engaging piece 84 with the lower locking hole 72 in a detachable manner, the connecting body 82 Is detachably connected and fixed to the lower part of the operating member 69 in a downward protruding shape.
The connecting body 82 is placed on the upper wall 27b of the interlocking tool 27 via the bottom wall 82d, and is connected by inserting and tightening a tightening tool 88 such as a bolt nut through the front and rear connecting pieces 62 and the connecting cylinder 85. The body 82 is detachably connected to the interlocking tool 27.

Thus, the spring storage case 89 is formed by the upper half of the back wall 82b of the connecting body 82, the lower spring receiving wall 86, the front and rear storage side walls 77c of the lower guide member 77, and the upper spring receiving wall 79.
The coil spring 90 is housed in the spring storage case 89 in the vertical direction, the upper end of the coil spring 90 is received by the upper spring receiving wall 79, the lower end of the coil spring 90 is received by the lower spring receiving wall 86, and the lower guide member 77 is received by the coil spring 90. The connecting body 82 to the interlocking tool 27 are urged downward. Therefore, the interlocking tool 27 is urged to the lock position X by the urging member 91 formed by the coil spring 90.

Further, the upper engaging piece 83 and the lower engaging piece 84 are removed from the upper locking hole 71 or the lower locking hole 72 to remove the connecting body 82 from the operating member 69, and the fastener 88 is removed to interlock the connecting body 82. By removing it from the tool 27, the connecting body 82 can be retracted from between the operating member 69 and the interlocking tool 27 to open the opening groove 10.
Further, by removing the connecting body 82 from the operating member 69, loosening the fastener 88, and rotating the connecting body 82 inward around the tightening tool 88, the connecting body 82 can be linked with the operating member 69. The opening groove 10 can be opened by retracting from the space 27.

As a result, a tool can be inserted through the opening groove 10 to remove the retaining member 15 attached to the upper part of the pedestal 9, whereby the damaged pedestal 9 can be taken out from the column body 8 and replaced or repaired. Can be done.
As shown in FIGS. 2, 3, 6 and 11, an operating means 93 for manually operating the pair of operating members 69 at the same time is provided between the pair of operating members 69. The operating means 93 has an engaging portion 94 provided on each operating member 69, and an operating rod 96 having an interlocking portion 95 that engages with the engaging portion 94 of the left and right operating members 69.

The engaging portion 94 is formed in an engaging body 98 that is formed separately from the operating member 69, and the engaging portion 98 is formed in an L-shaped bent mounting portion 101 and inward in the left-right direction from the mounting portion 101. The mounting portion 101 integrally includes a protruding engaging portion 94, and the mounting portion 101 has a vertical wall 103 and a horizontal wall 104 projecting outward in the left-right direction from the upper end portion of the vertical wall 103, and the engaging portion 94 is a horizontal wall. It is projected inward in the left-right direction from 104, and has a pair of front-rear engaging pieces 107 and a horizontal plate-shaped connecting wall 108 that connects the lower parts of the front-rear engaging pieces 107. Its upper surface is inclined downward inward in the left-right direction, and is formed in a tapered shape in which the vertical width gradually narrows inward in the left-right direction.

The vertical wall 103 of the mounting portion 101 is arranged along the inner surface of the operating member 69 in the left-right direction, and the horizontal wall 104 is engaged with the upper end of the operating member 69 from above and operated by a fixture 22 such as a rivet. It is fixed to the upper part of the member 69.
The operating rod 96 is formed in a rectangular cylinder shape that is long in the left-right direction, and the concave groove 19 of the uppermost tread member 6c.
It is arranged in the left-right direction along the longitudinal direction of the tread member 6c, so that it can be manually operated from the lower side of the tread member 6c. The left and right ends of the operating rod 96 are interlocking portions 95, and the interlocking portions 95 are fitted onto the engaging portions 94 of the operating member 69, respectively, whereby the operating rod 96 is connected to the left and right operating members 69, and the left and right ends are connected to each other. The interlocking portion 95 is engaged with the engaging portion 94 of the left and right operating members 69, respectively, and the left and right operating members 69 are simultaneously pulled upward by the upward movement (movement in the unlocking direction) of the operating rod 96 to the left and right. The lock mechanism 7 can be unlocked.

Plays a1 and a2 are provided above and below between the interlocking portions 95 on both the left and right sides of the operation stick 96 and the engaging portion 94 corresponding to the interlocking portion 95, and one interlocking portion 95 of the operating rod 96 is engaged. When engaged with the portion 94 and moved in the unlocking direction (upward direction), the other interlocking portion 95 of the operation stick 96 is disengaged from the engaging portion 94. Therefore, by pushing one of the left and right end portions (left-right interlocking portion 95) of the operation stick 96 upward, the operation stick 96 is tilted to the left or upward by the play a1 and a2, and one of the operation members 69 is tilted. Only one of the left and right lock mechanisms 7 can be unlocked by moving it upward.

According to the embodiment, as shown in FIG. 4, the lock member 23 is engaged with the locked portion 11 of the pedestal 9, and the left and right pedestals 9 are immovably locked with respect to the support body 8. In this state, when the left and right columns 5 are expanded and contracted at the same time, a finger is inserted into the concave groove 19 of the uppermost tread member 6c from the lower side, and the central portion of the operation rod 96 in the left-right direction is pressed upward. , The left and right operating members 69 are pulled in the unlocking direction (upward), and the left and right interlocking tools 27 move from the locking position X to the unlocking position Y against the urging of the urging member 91. Alternatively, when the knob 48 of the handle cover 47 is picked up and the left and right handles 25 are swung inward to the left and right in the direction of arrow a around the pivot shaft 24, the left and right operating portions 42 push the cam surface 61a upward and interlock. The tool 27 moves from the lock position X to the unlock position Y against the urging of the urging member 91.

Then, in the left and right lock mechanisms 7, when the interlocking tool 27 moves from the lock position X to the unlock position Y, there is an idle gap 65 between the second push piece 59 and the operation piece 55. The upward movement of the interlocking tool 27 disengages the regulating portion 60 from the position facing the pressing portion 54, releases the locking member 23 from being prevented from being released by the release preventing means 30, and enables the lock member 23 to swing. After that, the second pushing piece 59 pushes the operation piece 55 upward, the release swing of the lock member 23 is started, and the lock member 23 swings in the release direction. When the interlocking tool 27 moves to the unlocked position Y, the release of the pedestal 9 of the lock member 23 from the locked portion 11 is completed. As a result, the left and right pedestals 9 can be moved with respect to the column main body 8, and the columns 5 can be expanded and contracted.

In order to lock the left and right pedestals 9 immovably with respect to the support main body 8 after expanding and contracting the support column 5, the upward pressure of the operation stick 96 is released, or the left and right handle 25s are swung. When the urging member 91 is urged, the operating member 69 to the interlocking tool 27 moves downward, and the left and right interlocking tools 27 move from the unlocked position Y to the locked position X.
When the interlocking tool 27 moves from the unlocking position Y to the locking position X, the regulating portion 60 first pushes the pressing portion 54 downward to swing the locking member 23 in the engaging direction. After that, the first pushing piece 58 pushes the operating piece 55 downward, and when the interlocking tool 27 moves to the lock position X, the swing of the lock member 23 in the engaging direction is completed.

Further, when the left and right interlocking tools 27 move to the lock position X, the pressing portion 54 and the regulating portion 60 face each other, and the release preventing means 30 prevents the lock member 23 from swinging in the release direction. As a result, the lock member 23 engages with the locked portion 11 of the pedestal 9, whereby the pedestal 9 is immovably locked with respect to the column body 8. Moreover, the detachment preventing means 30 can prevent the lock member 23 from swinging in the detaching direction, and can surely prevent the pedestal 9 from unexpectedly expanding and contracting with respect to the support column main body 8.

Therefore, when the left and right interlocking tools 27 move to the lock position X, the interlocking means 29 engages the lock member 23 with the pedestal 9, and at the same time, the disengagement preventing means 30 engages the lock member 23 with the pedestal 9. It is possible to prevent the case from coming off unexpectedly. Moreover, when the interlocking tool 27 is released from the lock position X, the release preventing means 30 allows the lock member 23 to swing apart, and the interlocking tool 27 moves from the lock position X to the lock release position Y, so that the lock member 23 is moved. The engagement with the pedestal 9 and the disengagement from the pedestal 9 can be easily changed, and the expansion / contraction adjustment operation can be easily performed.

Further, when adjusting the expansion and contraction of only one of the left and right support columns 8 of the support column 5, a finger is inserted into the concave groove 19 of the uppermost tread member 6c from the lower side, and one end of the operation rod 96 in the left-right direction. Is pressed upward, only one end of the operating rod 96 in the left-right direction moves upward, only one of the left and right operating members 69 is pulled in the unlocking direction (upward), and one interlocking tool 27 moves the urging member 91. It moves from the lock position X to the unlock position Y against the urge to move. Alternatively, when the knob 48 of the handle cover 47 is picked up and one of the left and right handles 25 is swung inward to the left and right in the direction of the arrow a around the pivot shaft 24, one of the operating portions 42 moves the cam surface 61a. When pushed upward, the interlocking tool 27 moves from the lock position X to the unlock position Y against the urging of the urging member 91. As a result, only one of the lock mechanisms 7 is unlocked, only one of the columns 5 can be expanded and contracted, and only one of the columns 5 can be easily expanded and contracted.

Therefore, in the unlock operation by the operation stick 96, the operator can perform the unlock operation in a standing posture, and when the central portion of the operation stick 96 is operated in the unlock direction, the entire operation stick 96 moves in the unlock direction. The pair of operating members 69 move in the unlocking direction at the same time, the pair of lock mechanisms 7 are unlocked, the pair of columns 5 can be expanded and contracted at the same time, and the pair of columns 5 can be easily expanded and contracted at the same time. Can be done.

Further, since play a1 and a2 are provided between the interlocking portions 95 and the engaging portions 94 on both sides, when one end of the operating rod 96 is operated in the unlocking direction, one end of the operating rod 96 is unlocked. Moving in the direction, the other end of the operating rod 96 becomes free with play a1 and a2, keeps the disengaged state, and moves within the range of play a1 and a2, and the operating rod 96 moves to the left or to the right. Tiltd so that only one operating member 69 moves in the unlocking direction, the other operating member 69 does not move in the unlocking direction, one locking mechanism 7 is unlocked, and the other locking mechanism 7 Remains locked.

Therefore, only one of the columns 5 can be expanded and contracted, and only one of the columns 5 can be easily expanded and contracted. Therefore, for example, when the ground contact location of the stepladder 1 is inclined or uneven, the pair of columns 5 can be easily expanded and contracted to different lengths, and the stepladder 1 is stable even in the inclined or uneven place. And it will be possible to install it quickly.
Further, since the operation member 69 is arranged along the outer surface of the support column main body 8, the lock mechanism 7 and the operation member 69 do not interfere with the use of the stepladder 1. Moreover, since the lock mechanism 7 and the operating member 69 are arranged outside the pedestal 9, the pedestal 9 can be formed of a tubular body, which is advantageous in terms of strength. Further, by using the operation member 69, it is possible to easily operate the engagement of the lock member 23 with the pedestal 9 and the disengagement from the pedestal 9 from a position away from the lock mechanism 7.

13 and 14 show a second embodiment in which the telescopic device of the present invention is mounted on the step 111. In FIGS. 13 and 14, the step 111 is mainly configured by pivotally supporting the upper portions of a pair of ladders 2 arranged to face each other on both ends of a top plate 112 with pins 116 via a pair of left and right brackets 115, respectively. There is. The step 111 can be used by opening a pair of ladders 2 around the pin 116 and grounding the ground surface, and can also lock and store both ladders 2 so as not to fold and open the pair of ladders 2. ..

As in the case of the first embodiment, the ladder 2 includes a pair of stretchable columns (expandable bodies) 5, a plurality of tread members (bar members) 6 connecting the left and right columns 5, and the columns 5. It has a lock mechanism 7 provided between the step ladder member 6. Further, the pair of columns (expandable body) 5 are connected by a tread member (bar member) 6 at intervals, and the lock mechanism 7 and the operation member 69 are attached to each column body (cloak body) 8 of the pair of columns 5. And are provided, and an operating means 93 for manually operating the pair of operating members 69 at the same time is provided between the pair of operating members 69, and the operating means 93 is provided with an engaging portion 94 provided on each operating member 69 and an interlocking portion. It has an operation stick 96 having 95.

Then, unlike the case of the first embodiment, the engaging portion 94 has a bottom wall 119, an upper wall 120, a pair of front and rear side walls 121, and a closing wall 122 located at an outer end portion in the left-right direction. It is formed in the shape of a bottomed square tube with an opening on the inner side in the left-right direction.
The operation stick 96 is formed in a horizontal plate shape in the left-right direction, is arranged in the concave groove 19 of the uppermost step member 6c in the left-right direction along the longitudinal direction of the step member 6, and is arranged at both left and right ends of the operation stick 96. The portions are referred to as interlocking portions 95, and the interlocking portions 95 are fitted in the engaging portions 94 of the operating members 69 in a loose-fitting manner. As a result, the operation stick 96 can be manually operated from the lower side of the tread member 6c, and the left and right interlocking portions 95 are engaged with the engaging portions 94 of the left and right operation members 69, respectively, and above the operation stick 96. By moving, the left and right operating members 69 can be pulled upward at the same time to unlock the left and right locking mechanisms 7.

Plays a1 and a2 are provided between the interlocking portions 95 on the left and right sides of the operation stick 96 and the engaging portion 94 corresponding to the interlocking portion 95, and one interlocking portion 95 of the operating rod 96 is attached to the engaging portion 94. When engaged and moved in the unlocking direction (upward direction), the other interlocking portion 95 of the operation stick 96 is disengaged from the engaging portion 94.
FIG. 15 shows a third embodiment, in which the operating means 93 for manually operating the pair of operating members 69 includes an operating rod 96 connecting the pair of operating members 69 and an engaging body 98, and the operating rod 96 has a cross section. It is formed in the shape of an I-shaped plate, and the left and right ends of the operating stick 96 are connected and engaged with a pair of operating members 69 via an engaging body 98, respectively.

The engaging body 98 integrally includes an L-shaped bent mounting portion 101 having a vertical wall 103 and a horizontal wall 104, and a pair of front and rear connecting pieces 131 protruding inward in the left-right direction from the mounting portion 101, and is mounted. The portion 101 is fixed to the upper part of the operating member 69 by a fixing tool 22 such as a rivet, as in the case of the above embodiment.
The front and rear connecting pieces 131 are provided with mounting holes 132, and the left and right ends of the operating rod 96 are provided with mounting holes 134 corresponding to the mounting holes 132, and the left and right ends of the operating rod 96 are between the front and rear connecting pieces 131. The left and right ends of the operation stick 96 are fastened and fixed to the front-rear connecting piece 131 by a connecting tool 136 such as a bolt and a nut that is internally fitted into the mounting holes 132 and 134. As a result, by moving the operating rod 96 upward (moving in the unlocking direction), the left and right operating members 69 can be pulled upward at the same time to unlock the left and right locking mechanisms 7, and the left and right ends of the operating rod 96 can be released. Operation due to the gap between the mounting hole 134 and the connecting tool 136, the gap between the mounting hole 132 of the connecting piece 131 and the connecting tool 136, and the bending deformation of the pair of operating members 69 inward in the left-right direction. When one end of the rod 96 is moved in the unlocking direction (upward), the movement of the other end of the operating rod 96 is relaxed and absorbed in the unlocking direction (upward) to be suppressed, and the operating rod 96 is moved to the left or It is tilted upward to the right and only one of the operating members 69 is moved upward so that only one of the left and right lock mechanisms 7 can be unlocked. Therefore, when the pair of operating members 69 and the left and right ends of the operating rod 96 are operated in the unlocking direction of the operating rod 96, the operating rod 96 is tilted to unlock only one of the operating members 69. Engaged movably in the direction.

Although not shown, in the same manner as in the case of the above-described embodiment, the operation stick 96 has the longitudinal length of the tread member 6c in the concave groove 19 of the uppermost tread member 6c as in the case of the above-described embodiment. It is arranged in the left-right direction along the direction, so that it can be manually operated from the lower side of the tread member 6c.
The invention according to the present embodiment is not limited to the above embodiment. In the above embodiment, the telescopic device is applied to the stepladder 1 or the step 111 having the telescopic support 5, but the telescopic device may be applied to the ladder or the like instead.

Further, the telescopic body is not limited to the strut 5 composed of the strut body 8 and the pedestal 9, and the telescopic body may be a member that expands and contracts as a whole by inserting the pedestal 9 into the tubular member.
Further, in the above embodiment, when the interlocking tool 27 moves from the unlocking position Y to the locking position X, the regulating portion 60 first pushes the pressing portion 54 downward and swings the locking member 23 in the engaging direction. After moving, the first pushing piece 58 pushes the operating piece 55 downward, but instead of this, when the interlocking tool 27 moves from the unlocking position Y to the locking position X, the first pushing piece 58 moves. 1 The lock member 23 may swing in the engaging direction only when the pushing piece 58 pushes the operating piece 55 downward.

1 Stepladder (expansion and contraction device)
2 Ladder 5 Support (expandable body)
6 Tread member (bar member)
7 Lock mechanism 8 Support body (cloak body)
9 pedestal (insertion body)
11 Locked part 23 Lock member 24 Pivot shaft 25 Handle 69 Operation member 94 Engagement part 95 Interlocking part 96 Operation stick 98 Engagement body a1 Play a2 Play 111 Step (extension device)

Claims (6)

A pair of left and right telescopic bodies (5) having a mantle (8) and an insert body (9) that is stretchably inserted into the mantle (8) and whose lower end can be grounded, and the left and right stretchable bodies (5). ), The upper, middle, and lower three-stage tread members (6), which are connected to the facing surfaces of the outer body (8) in the longitudinal direction so as to face each other, and the insertion inserted into each outer body (8). Expansion and contraction including a lock mechanism (7) for fixing the body (9) to the mantle body (8) at an expanded and contracted position, and an operating member (69) for locking and unlocking each lock mechanism (7). It ’s a device,
Each of the lock mechanisms (7) is near the connection position between the locked portion (11) provided on the insert body (9) along the longitudinal direction, the outer body (8), and the lower tread member (6). It has a lock member (23) that is arranged in the insert body (9) and engages with the locked portion (11) of the insert body (9) in a disengaged manner.
The operating member (69) is arranged so as to be close to the facing surface of the mantle body (8) and to be vertically movable along the longitudinal direction.
An insertion space (21) through which the operation member (69) is inserted is formed between the longitudinal end of the tread member (6) in the middle stage and the facing surface of the mantle (8).
The operating member (69) extends to the vicinity of the connecting position between the mantle body (8) and the upper tread member (6), and the operating member (69) is moved up and down above the operating member (69). The upper end where the force is applied is formed,
An operation stick (96) that applies a force for vertically moving the upper end of the operation member (69) at a position below the upper surface of the upper step member (6) and along the upper step member (6). Have been placed and
Each of the lock mechanisms (7) has a pivot shaft (24) that swingably supports the lock member (23) and the pivot shaft (24) that is fixed to the facing surface of the mantle body (8). It has a support frame (18) to support and
An expansion / contraction device characterized in that a retaining member (15) is provided at the upper end of the insertion body (9) so as to come into contact with the support frame (18) and regulate the removal from the mantle body (8) . A pair of left and right telescopic bodies (5) having a mantle (8) and an insert body (9) that is stretchably inserted into the mantle (8) and whose lower end can be grounded, and the left and right stretchable bodies (5). ), The upper, middle, and lower three-stage tread members (6), which are connected to the facing surfaces of the outer body (8) in the longitudinal direction so as to face each other, and the insertion inserted into each outer body (8). Expansion and contraction including a lock mechanism (7) for fixing the body (9) to the mantle body (8) at an expanded and contracted position, and an operating member (69) for locking and unlocking each lock mechanism (7). It ’s a device,
Each of the lock mechanisms (7) is near the connection position between the locked portion (11) provided on the insert body (9) along the longitudinal direction, the outer body (8), and the lower tread member (6). It has a lock member (23) that is arranged in the insert body (9) and engages with the locked portion (11) of the insert body (9) in a disengaged manner.
The operating member (69) is arranged so as to be close to the facing surface of the mantle body (8) and to be vertically movable along the longitudinal direction.
An insertion space (21) through which the operation member (69) is inserted is formed between the longitudinal end of the tread member (6) in the middle stage and the facing surface of the mantle (8).
The operating member (69) extends to the vicinity of the connecting position between the mantle body (8) and the upper tread member (6), and the operating member (69) is moved up and down above the operating member (69). The upper end where the force is applied is formed,
An operation stick (96) that applies a force for vertically moving the upper end of the operation member (69) at a position below the upper surface of the upper step member (6) and along the upper step member (6). Have been placed and
The upper踏桟member (6) is recessed is opened downward is provided on the lower side than the upper surface, Shin characterized in that said operating rod (96) is operatively disposed in the recessed Shrink device. A pair of left and right telescopic bodies (5) having a mantle (8) and an insert body (9) that is stretchably inserted into the mantle (8) and whose lower end can be grounded, and the left and right stretchable bodies (5). ), The upper, middle, and lower three-stage tread members (6), which are connected to the facing surfaces of the outer body (8) in the longitudinal direction so as to face each other, and the insertion inserted into each outer body (8). Expansion and contraction including a lock mechanism (7) for fixing the body (9) to the mantle body (8) at an expanded and contracted position, and an operating member (69) for locking and unlocking each lock mechanism (7). It ’s a device,
Each of the lock mechanisms (7) is near the connection position between the locked portion (11) provided on the insert body (9) along the longitudinal direction, the outer body (8), and the lower tread member (6). It has a lock member (23) that is arranged in the insert body (9) and engages with the locked portion (11) of the insert body (9) in a disengaged manner.
The operating member (69) is arranged so as to be close to the facing surface of the mantle body (8) and to be vertically movable along the longitudinal direction.
An insertion space (21) through which the operation member (69) is inserted is formed between the longitudinal end of the tread member (6) in the middle stage and the facing surface of the mantle (8).
The operating member (69) extends to the vicinity of the connecting position between the mantle body (8) and the upper tread member (6), and the operating member (69) is moved up and down above the operating member (69). The upper end where the force is applied is formed,
An operation stick (96) that applies a force for vertically moving the upper end of the operation member (69) at a position below the upper surface of the upper step member (6) and along the upper step member (6). Have been placed and
An interlocking portion (95) is provided at the end of the operating rod (96), and is engaged with the interlocking portion (95) in a disengaged manner to move the operation of the operating rod (96) up and down. engaging portion to be converted to (94) is stretched or squeezed device you characterized in that it is provided at the upper end of the operating member (69). An upper guide member (76) that regulates the upper part of the operating member (69) from separating from the facing surface of the outer body (8) in the vicinity of the connecting position between the outer body (8) and the upper tread member (6). Is provided,
A claim characterized in that a lower guide member (77) for restricting the lower part of the operating member (69) from separating from the facing surface of the mantle body (8) is provided in the lower part of the mantle body (8). Item 6. The telescopic device according to any one of Items 1 to 3. A connecting body (82) for engaging and disengaging the lock member (23) by moving the operating member (69) up and down is provided between the lower portion of the operating member (69) and the lock member (23). The telescopic device according to any one of claims 1 to 4. Each of the lock mechanisms (7) includes a pivot shaft (24) that swingably supports the lock member (23), a spring (90) that urges the lock member (23) in a locking operation direction, and the spring (90). Any one of claims 1 to 5, characterized in that it has a handle (25) that swings the lock member (23) around a pivot shaft (24) against a spring (90). The telescopic device described in.

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