JP2017048650A - Expansion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion device capable of preventing the separation and oscillation of a locking member, and capable of facilitating operation of expansion adjustment.SOLUTION: An interlocking unit 27 supported movably between a lock position X and a lock release position Y, interlocking means 29 for engaging a lock member 23 with an insertion body 9 when the interlocking unit 27 is moved to the lock position X and separating the lock member 23 from the insertion body 9 when the interlocking unit 27 is moved to the lock release position Y, and separation preventing means 30 preventing the separation and oscillation of the lock member 23 when the interlocking unit 27 is moved to the lock position X and allowing the separation and oscillation of the lock member 23 when the interlocking unit 27 comes off from the lock position X are provided on a support frame 18 of a lock mechanism 7 for fixing the insertion body 9 into a mantle body 8 in an expansion position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a telescopic device such as a ladder or a stepped strut that can be stretched.

  For example, the strut support device for the stepladder is provided with a lock mechanism for inserting the insert body into the mantle body so that the insert body can be extended and contracted, and fixing the insert body to the mantle body at a position where the maneuver body is expanded and contracted. And a lock member that is pivotally supported with respect to the support frame and engages with an engaged portion of the insert, and a handle that detaches and swings the lock member from the insert. .

  In this type of conventional expansion and contraction device, the handle is formed integrally with the pivot support portion that supports the lock member and is supported by the pair of side walls of the support frame so as to be movable in the axial direction. And a latching portion that swings the lock member, supports the handle movably in a direction perpendicular to the swinging direction with respect to the support frame, and latches the latching portion on the side wall portion of the support frame. When a locking hole is provided and the locking member locks the insert, the handle or the locking member is made non-oscillating by locking the locking portion to the locking hole by moving the handle. There is one that prevents the separation swing (for example, Patent Document 1).

JP 2006-52581 A

  However, in the conventional case, after engaging the lock member with the insertion body by the swinging operation of the handle, it is necessary to move the handle in a direction perpendicular to the swinging direction to hook the latching portion into the latching hole. When removing the lock member from the insert, first, the handle is moved in a direction perpendicular to the swinging direction to release the latching portion from the latching hole, and then the handle is swung. There is a problem that the lock member has to be detached from the insertion body by the operation, and the operation of the expansion / contraction adjustment is very troublesome.

  In view of the above problems, an object of the present invention is to provide an expansion / contraction device that can prevent the rocking movement of the lock member and can easily perform expansion / contraction adjustment.

Specific means for solving the problems in the present invention are as follows.
The technical means of the present invention for solving this technical problem is provided with a lock mechanism 7 for inserting the insert 9 into the outer shell 8 so as to be extendable and fixing the insert 9 at the extended position. The lock mechanism 7 includes a support frame 18 fixed to the outer cover 8, and a lock member 23 that is pivotally supported with respect to the support frame 18 and engages the locked portion 11 of the insert 9. The interlocking tool 27 is supported by the support frame 18 so as to be movable between the lock position X and the unlocking position Y, and the lock member 23 is inserted into the insert 9 when the interlocking tool 27 moves to the lock position X. And an interlocking means 29 for releasing the lock member 23 from the insertion body 9 when the interlocking tool 27 moves to the unlocking position Y, and a disengagement of the lock member 23 when the interlocking tool 27 moves to the lock position X. Prevents rocking and interlocks 27 and the detachable blocking means 30 to permit withdrawal swinging of the locking member 23 when the off-lock position X, lies in is provided.

In another technical means of the present invention, the interlocking means 29 includes an operation piece 55 projecting from the lock member 23 that is pushed by the movement of the interlocking tool 27, and the operating piece 55 is moved in the moving direction of the interlocking tool 27. The first pushing piece 58 and the second pushing piece 59 projecting from the interlocking tool 27 so as to be sandwiched between the two, and when the interlocking tool 27 moves to the lock position X, the lock member 23 is swung in the engaging direction. The first push piece 58 pushes the operation piece 55 to cause the second push piece 59 to move the lock member 23 in the disengagement direction when the interlocking tool 27 moves to the unlocking position Y. Configured to push 55,
The separation preventing means 30 includes a pressing portion 54 that protrudes toward the interlocking device 27 on the swing end side of the lock member 23, and a restriction portion 60 that protrudes toward the pressing portion 54 on the interlocking device 27. When the interlocking tool 27 moves to the lock position X, the pressing part 54 and the restricting part 60 face each other, and when the interlocking tool 27 moves away from the lock position X, the restricting part 60 comes out of the pressing part 54 facing position. Composed of
When the interlocking tool 27 moves from the lock position X to the lock release position Y, the second pushing piece is arranged so that the detachment swing of the lock member 23 is started after the restricting portion 60 is disengaged from the pressing portion 54. An idle gap 65 is formed between 59 and the operation piece 55.

As another technical means of the present invention, a biasing means 91 for biasing the interlocking device 27 to the lock position X is provided, and the lock mechanism 7 pivotally supports the lock member 23 in a swingable manner. 24, and a handle 25 supported by the pivot shaft 24. The handle 25 includes a grip 41 and an operating portion 42 protruding from the grip 41 to the interlocking device 27.
The interlocking tool pushing means 67 that pushes the interlocking tool 27 to the unlocking position Y against the biasing of the biasing member 91 by rotating the handle 25 around the pivot shaft 24 is interlocked with the grip portion 41. It exists in the point provided between the tools 27.

  Another technical means of the present invention is that the insert 9 is inserted into the outer shell 8 to form the stretchable body 5, the stretchable body 5 is arranged in parallel on the left and right, and the left and right outer shell 8 is connected to the footpiece member. 6 are connected to each other to form a ladder 2. Locking mechanisms 7 are provided on the opposing surfaces of the left and right outer shells 8, and the interlocking tool 27 can be moved along the opposing surfaces of the outer shell 8 in the longitudinal direction. It is in the point which holds in.

  According to the present invention, when the interlocking tool is moved to the lock position, the interlocking member engages the lock member with the insert, and at the same time, the disengagement preventing means prevents disengagement swinging of the lock member. Therefore, it is possible to prevent the engagement of the lock member with the insertion body from being accidentally released. In addition, when the interlocking tool moves to the unlocking position, if the interlocking tool is released from the locking position, the disengagement preventing means allows the lock member to swing, and when the interlocking tool moves to the unlocking position, the interlocking means is locked. Since the member is detached from the insertion body, the engagement of the locking member to the insertion body and the separation from the insertion body can be easily changed by moving the interlocking tool to the locked position or unlocking position, and the expansion and contraction can be performed. Adjustment operation can be easily performed.

It is a partial cross section front view of the stepladder which shows one Embodiment of this invention. It is a perspective view of the support | pillar. It is the side view seen from the inner side of the support | pillar. It is front sectional drawing of the same support | pillar lower part. It is front sectional drawing of the support | pillar lower part of the state which cancelled | released the lock | rock. It is front sectional drawing of the same support | pillar upper part. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a disassembled perspective view of a lock member and a handle. It is a disassembled perspective view of a lower guide member, a connection body, a interlocking tool, etc. It is a whole side view of a stepladder.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1-11 has shown the structure of the stepladder which implemented the expansion-contraction apparatus of this invention to the stepladder. 1 and 11, the stepladder 1 is mainly configured by pivotally supporting upper portions of a pair of ladders 2 arranged opposite to each other by a pin 4 via a bracket 3. The stepladder 1 can be used by standing a pair of ladders 2 against the ground surface, and unlocking the locking stoppers that lock the two ladders 2 so as not to open the pair of ladders 2 so that one ladder 2 can be used. It can be used by rotating around the pin 4.

The ladder 2 includes a pair of struts 5 (stretchable bodies) that are arranged to be stretchable and spaced from each other on the left and right sides, a plurality of step bars 6 that respectively connect the left and right struts 5, and the pillars 5 and 6 The locking mechanism 7 is provided between the two.
In the following description, for convenience of description, as shown in FIG. 1, the direction in which the traverse member 6 can be viewed from the front and the columns 5 are arranged in parallel (the left-right direction in FIG. 1) is the left-right direction. 11, the parallel direction of the ladder 2 (the left-right direction in FIG. 11) is the front-rear direction.

Each column 5 includes a column main body 8 (outer body) formed of a channel material, and a square cylindrical leg column 9 (insert) inserted into the column main body 8. The column 5 can be expanded and contracted by sliding it in the axial direction (vertical direction), and the leg column 9 is fixed so as not to move in the axial direction at a predetermined position expanded and contracted by the lock mechanism 7. Yes.
1 to 10, the column main body 8 is formed of a metal system such as aluminum and has a substantially U-shaped cross-sectional view, and an opening groove 10 is formed in the longitudinal direction on the opposite side of the column main body 8 facing the column main body 8. Is formed.

  The pedestal 9 is made of a metal such as aluminum like the column main body 8, and a plurality of locked portions 11 (rack portions) are provided 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 grounds the ladder 2 in a stable state to the grounding surface. A retaining member 15 that abuts a support frame 18 of the lock mechanism 7 described later and prevents the leg column 9 from coming off from the column main body 8 is provided on the upper part that is the insertion base of the leg column 9 so as to project outward from the opening groove 10. It has been.

As shown in FIG. 6, the retaining member 15 is detachably fixed to the leg portion 9 by a fixing tool 17 such as a bolt.
The crosspiece member 6 is formed in a rectangular tube shape, and the upper and lower surfaces of the crosspiece member 6 are inclined so as to move upward or downward from the front side toward the rear side, Non-slip unevenness is formed over the longitudinal direction.

The crosspiece member 6 (6b) in the middle part of the ladder 2 is fixed between the left and right column main bodies 8 via plate-like brackets 14 attached to the front and rear walls 13F and 13R of the column main body 8.
A pair of front and rear plate-like brackets 14 are arranged corresponding to the outer end portion of the footpiece member 6, and each bracket 14 has a column fixing portion 14a and a foothold fixing portion 14b via a stepped portion 14c. The column fixing part 14a is fixed to the column main body 8 with a fixing tool 22 such as a rivet, and the step rail fixing part 14b is fixed to the outer end of the step frame member 6 with a fixing tool 22 such as a rivet, as shown in FIG. Thus, an insertion space 21 for a long operation member 69 described later is formed between the outer side surface of the column main body 8 and the end portion of the traverse member 6.

The lock mechanism 7 is provided between the lowermost step bar member 6 a of the ladder 2 and the support column 5, and one lock mechanism 7 is provided for each support column 5. The lock mechanism 7 is attached to the.
The lock mechanism 7 is supported by a support frame 18 fixed to the column main body 8, and is pivotally supported so as to be swingable in the left-right direction (a direction in FIGS. 4 and 5). A lock member 23 that engages with the locking portion 11, a pivot shaft 24 that supports the lock member 23 in a swingable manner, and a handle that is supported by the pivot shaft 24 and that swings the lock member 23 away from the leg column 9. 25.

As will be described later, the lock member 23 is swingable in the left-right direction around a pivot shaft 24 supported by the support frame 18, and can be freely engaged with and disengaged from the leg pillar 9 by swinging of the lock member 23. It can be done.
The lock mechanism 7 includes an interlocking tool 27 supported on the support frame 18 so as to be movable between the lock position X and the unlocking position Y shown in FIGS. 2, 4, and 5. 27, when the interlocking tool 27 moves to the lock position X, the lock member 23 is engaged with the leg pillar 9 and when the interlocking tool 27 moves to the unlocking position Y, the lock member 23 is moved to the leg pillar 9. The interlocking means 29 for releasing the lock member 23 and the locking member 23 are prevented from swinging when the interlocking tool 27 moves to the lock position X. And a disengagement preventing means 30 for allowing

  The support frame 18 is formed in a box shape by bending a single metal plate such as aluminum, and can be attached to the column main body 8 and the tread bar member 6. Side) has an opening shape, and is attached to the front and rear walls 13F and 13R of the column main body 8 and extends to the facing portion side, and a pair of front and rear side wall portions 32F and 32R, and a locked portion of the pedestal 9 11 and a back wall portion 33 disposed between the front and rear side wall portions 32F and 32R, and a pair of step rails that project downward from the lower portions of the front and rear side wall portions 32F and 32R and are attached to the step rail member 6 It has mounting portions 34F and 34R.

The outer portions of the front and rear side wall portions 32F and 32R of the support frame 18 are formed so as to be able to sandwich the front and rear walls 13F and 13R of the column main body 8, and the front and rear walls 13F of the column main body 8 are formed outside the front and rear side wall portions 32F and 32R. , 13R, and the support frame 18 is attached to the column main body 8 by striking a fixture 22 such as a rivet against them.
The step rail mounting portions 34F and 34R of the support frame 18 are formed so as to be able to sandwich the end side of the front and rear walls 26F and 26R of the step rail member 6, and the step rail mounting portions 34F and 34R The support frame 18 is attached to the footpiece member 6 by sandwiching the end portions of the walls 26F and 26R and driving a fixture 22 such as a rivet against them.

Therefore, the support frame 18 has a function of a bracket for connecting the step rail member 6 to the support column 5, and this can reduce the number of brackets for mounting the step beam member 6 to the support column 5. it can.
When the support frame 18 is attached to the footpiece member 6, the inclined portion 16 on the upper surface side of the footpiece member 6 enters the support frame 18. The back wall portion 33 of the support frame 18 is formed in a vertical plate shape in the front-rear direction.

The pivot shaft 24 is formed in a cylindrical shape, is provided in a penetrating manner in the front and rear side wall portions 32F and 32R of the support frame 18, and is supported so as to be rotatable in the same direction as the rocking direction of the lock member 23.
The distal end of the pivot shaft 24 is fitted with a retaining ring 37 having a larger diameter than the pivot shaft through hole 36R (one of the pivot shaft through holes 36F, 36R) of the rear side wall portion 32R. 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 so that the support shaft 24 does not fall out of the support portion through hole 36R.

  As shown in FIGS. 3, 4, 5, and 9, the handle 25 includes a gripping portion 41 and an operating portion 42 that protrudes from the gripping portion 41 toward the interlocking device 27, and the gripping portion 41 is a pivot shaft. 24 is fixed to one end portion (front end portion) of 24 by welding or the like, arranged along the outer surface of the front side wall portion 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 rearward from the pivot shaft 24 at a position away from the pivot shaft 24 in the radial direction. The pivot shaft 24, the grip portion 41, and the operating portion 42 are formed in a substantially U shape in a side view.

The operating portion 42 of the handle 25 is inserted into an operating portion through hole 44 provided in the lower portion of the front wall portion 32F of the support frame 18. The operating portion through hole 44 is formed in an arc shape centered on the axis of the pivot shaft 24 (center of the pivot shaft through holes 36F and 36R).
A gripping portion 41 of the handle 25 integrally connects the pivot shaft 24 and the operating portion 42. A handle cover 47 made of synthetic resin is externally attached to the front portion of the grip portion 41 and the pivot shaft 24 and the front portion of the operation portion 42, and the handle cover 47 is attached to the front portion of the grip portion 41 and the pivot shaft 24 and the operation portion. The outer periphery of the front part of 42 is covered. A left and right narrow knob 48 projects downward from the handle cover 47.

The lock member 23 is disposed between the front and rear wall portions 32 </ b> F and 32 </ b> R of the support frame 18, and is disposed on the outer side of the operating portion 42 and the pivot shaft mounting portion 49 that is mounted at the substantially front and rear central portion of the pivot shaft 24. And a locking portion 52 that engages with the locked portion 11 of the pedestal 9.
A pivot shaft mounting portion 49 of the lock member 23 is rotatably fitted to the pivot shaft 24, and the lock member 23 is supported so as to be swingable around the pivot shaft 24 in the left-right direction (direction a). ing. A pressing portion 54 protrudes from the lower portion (the free end side) of the lock member 23 toward the interlocking tool 27, and an operation piece 55 protrudes inward from the pivot shaft mounting portion 49.

  As shown in FIG. 4, FIG. 5 and FIG. 10, the interlocking device 27 has a pair of front and rear side walls 27a, a top wall 27b that connects the upper parts of the front and rear side walls 27a, and a back that connects the left and right inner ends of the front and rear side walls 27a. The outer wall having a wall 27c is formed in an open box shape, and is disposed so as to project upward on the inner side in the left-right direction of the lock member 23 in the support frame 18, and on the inner surface of the back wall 33 of the support frame 18. It is held so as to be slidable (movable) vertically. Accordingly, the interlocking tool 27 of the left and right support frame 18 is held so as to be movable in the longitudinal direction along the opposing surfaces of the left and right support columns 8 respectively.

  A rectangular tube 57 is projected outward from the upper portion of the back wall 27c of the interlocking tool 27. The upper portion of the rectangular tube 57 is a first push piece 58, and the lower portion is a second push piece 59. The first push piece 58 and the second push piece 59 are spaced apart in the vertical direction with the tip of the operation piece 55 sandwiched in the vertical direction. A restricting portion 60 projects outwardly from the rectangular tube 57 of the back wall 27c, and a pair of front and rear cam walls 61 having arcuate cam surfaces 61a are provided on both front and rear sides of the restricting portion 60.

A pair of front and rear connecting pieces 62 project upward from the upper wall 27 b 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. The piece 58 and the second pushing piece 59 sandwich the operation piece 55 in the moving direction of the interlocking tool 27, and when the interlocking tool 27 moves to the lock position X, the lock member 23 is swung in the engaging direction. Therefore, when the first push piece 58 pushes the operation piece 55 and the interlocking tool 27 moves to the unlocking position Y, the second push piece 59 causes the operation piece 55 to swing in the disengagement direction. Is configured to push.

  In the case of the present embodiment, when the interlocking tool 27 moves from the unlock position Y to the lock position X, first, the restricting portion 60 pushes the pressing portion 54 downward to move the lock member 23 in the engaging direction. After that, the first pushing piece 58 pushes the operation piece 55 downward, and when the interlocking tool 27 moves to the lock position X, the lock member 23 is swung in the engaging direction. The movement is to be completed.

  The detachment preventing means 30 includes a pressing portion 54 projecting toward the interlocking device 27 on the swing end portion side of the lock member 23, and a regulating portion 60 projecting from the interlocking device 27 toward the pressing portion 54. When the interlocking device 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 detaching and swinging, and the interlocking device 27 is disengaged from the lock position X. In some cases, the restricting portion 60 is configured to be disengaged from the position opposed to the pressing portion 54 to allow the lock member 23 to detach and swing.

In addition, when the interlocking tool 27 moves from the lock position X to the lock release position Y, the separation member 60 starts to detach and swing after the restricting portion 60 is disengaged from the pressing portion 54 in FIG. As shown, an idle gap 65 is formed between the second push piece 59 and the operation piece 55.
By interlocking the handle 25 around the pivot shaft 24 in the left and right direction in the direction of arrow a, the interlock 27 is pushed to the unlock position Y against the bias of a biasing member 91 described later. A tool pushing means 67 is provided between the grip portion 41 and the interlocking tool 27. This interlocking tool pushing means 67 is constituted by the outer peripheral surface of the operating portion 42 and the cam surface 61 a of the front and rear cam walls 61 of the interlocking tool 27.

  As shown in FIGS. 2, 3, 6, 8, and 10, a long operation member 69 for operating the lock member 23 is disposed so as to block the opening groove 10 on the outer surface of the column main body 8. . The long operation member 69 is held so as to be movable in the longitudinal direction along the outer surface of the column main body 8 and is inserted and held in the insertion space 21 so as to be movable up and down. The interlocking device 27 is connected to the lower end portion (one end portion) of the long operation member 69 via a connecting body 82 described later, and the operation portion 70 is provided on the upper end portion (the other end portion) of the long operation member 69. .

The long operation member 69 has a plate-like operation wall portion 69a that is long in the vertical direction, and a pair of front and rear side wall portions 69b protruding outward from both front and rear end portions of the operation wall portion 69a. An upper locking hole 71 and a lower locking hole 72 are provided in the lower part with a space therebetween in the vertical direction, and the locking holes 71 and 72 are formed in a rectangular shape that is long in the front and rear direction.
The operation portion 70 is formed separately from the long operation member 69, and is bent outward from the attachment wall 70a disposed along the outer surface of the long operation member 69 and the upper portion of the attachment wall 70a. A top wall 70b disposed on the upper end surface of the long operation member 69, and the mounting wall 70a is fixed to the long operation member 69 by a fixture 22 such as a rivet, and is upward from the outer end of the top wall 70b. A finger-hanging piece 74 projects in a bowl shape toward the head.

The column main body 8 is provided with an upper guide member 76 and a lower guide member 77 for movably guiding the long operation member 69.
As shown in FIGS. 2, 3 and 6, the upper guide member 76 includes a pair of front and rear side walls 76a, a vertical plate-like back wall 76b connected to the left and right inner ends of the upper part of the front and rear side walls 76a, and a back. An inclined wall 76c that is inclined outwardly downward from the lower portion of the wall 76b and connected to the front and rear side walls 76a; a vertical plate-like support wall 76d that is erected upward from the lower portion of the inclined wall 76c and connected to the front and rear side walls 76a; The front and rear side walls 76a are fixed to the front and rear side walls 13F and 13R of the column main body 8 by hitting a fixture 22 such as a rivet, and the long operation member 69 is interposed between the support wall 76d and the outer surface of the column main body 8. The upper part is held movably up and down. In addition, the discharge hole for discharging rainwater is provided in the lower part of the inclined wall 76c.

As shown in FIGS. 2, 3 and 10, the lower guide member 77 protrudes inwardly 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. A pair of front and rear storage side walls 77c and an upper spring receiving wall 79 projecting inward from the upper portion of the back wall 77b so as to close the upper portion of the storage side wall 77c are provided.
A step portion 80 is provided in a middle portion in the left-right direction of the front / rear side wall 77a, an engagement piece 81 projects inward from the step portion 80 inward in the front / rear direction, and an outer portion of the front / rear side wall 77a is a rivet. Is fixed to the front and rear side walls 13F and 13R of the column main body 8 by striking the fixing tool 22 or the like, and the front and rear end portions of the long operation member 69 can be moved vertically between the step portion 80 and the engagement piece 81. It is pinched.

  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 long operation 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 protrudes upward from the front wall 82a, and an upper wall 82c protrudes inward from the upper part of the back wall 82b. An upper engagement piece 83 that protrudes upward and outward in a stepped manner is projected from the outer portion of the upper wall 82c. 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, and a cylindrical connecting cylinder 85 is provided between the back wall 82b and the bottom wall 82d. A lower spring receiving wall 86 for connecting the middle portion of the wall 82b is provided, and a connecting wall 82e for connecting the front and rear center portions of the front wall 82a, the back wall 82b, the bottom wall 82d, and the lower spring receiving wall 86 is provided, A lower engagement piece 84 projects in a hook shape outward from the upper portion of the front wall 82a.

The upper engagement piece 83 is detachably engaged with the upper locking hole 71 of the long operation member 69 and the lower engagement piece 84 is detachably engaged with the lower locking hole 72 to be connected. The body 82 is connected and fixed to the lower part of the long operation member 69 so as to protrude downward and be detachable.
The connecting body 82 is placed on the upper wall 27b of the interlocking tool 27 through the bottom wall 82d, and is connected by inserting and tightening a fastening tool 88 such as a bolt and nut into 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 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 form a spring storage case 89.
The coil spring 90 is stored 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. In contrast, the connecting body 82 to the interlocking tool 27 are urged downward. Accordingly, the interlocking device 27 is urged to the lock position X by the urging member 91 constituted by the coil spring 90.

Further, the upper engagement piece 83 and the lower engagement piece 84 are removed from the upper locking hole 71 or the lower locking hole 72, the connecting body 82 is removed from the long operation member 69, the fastening tool 88 is removed, and the connecting body 82 is removed. Is removed from the interlocking tool 27 so that the connecting body 82 can be retracted from between the long operating member 69 and the interlocking tool 27 to open the opening groove 10.
Alternatively, the connecting body 82 can be removed from the long operation member 69, the fastening tool 88 is loosened, and the connecting body 82 is rotated inwardly around the fastening tool 88, thereby connecting the connecting body 82 to the long operation member. The opening groove 10 can be opened by retreating from between 69 and the interlocking device 27.

As a result, a tool can be inserted through the opening groove 10 and the retaining member 15 attached to the upper part of the pedestal 9 can be removed, whereby the damaged pedestal 9 can be removed from the column main body 8 for replacement or repair. You can do it.
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 pedestal 9 is locked to the column main body 8 so as to be immovable. In the case of adjusting the expansion and contraction of the support column 5, when the finger is hooked on the finger hanging piece 74 of the operation unit 70 and the long operation member 69 is pulled upward, the interlocking tool 27 resists the urging of the urging member 91 to lock position X. To the unlocked position Y. Alternatively, when the knob 48 of the handle cover 47 is picked and the handle 25 is swung in the left and right directions in the direction of the arrow a around the pivot shaft 24, the operating portion 42 pushes the cam surface 61a upward to attach the interlocking tool 27. It moves from the lock position X to the lock release position Y against the bias of the biasing member 91.

  When the interlocking tool 27 moves from the lock position X to the unlocking position Y, there is an idle gap 65 between the second pushing piece 59 and the operation piece 55. The restricting portion 60 is disengaged from the position facing the pressing portion 54, and the disengagement prevention of the lock member 23 by the disengagement prevention means 30 is released, and the lock member 23 can be detached and swung. After that, the second push piece 59 pushes the operation piece 55 upward, and the detachment 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 unlocking position Y, the disengagement of the locking member 23 from the locked portion 11 of the pedestal 9 is completed. As a result, the pedestal column 9 can move with respect to the column main body 8, and the column 5 can be expanded and contracted.

To lock the pedestal 9 so that it cannot move with respect to the column main body 8 after the column 5 is expanded and contracted, the upward pulling of the long operation member 69 is released or the swing operation of the handle 25 is released. Then, due to the urging of the urging member 91, the long operation member 69 to the interlocking tool 27 move downward, and the interlocking tool 27 moves from the lock release position Y to the lock position X.
When the interlocking tool 27 moves from the unlocking position Y to the locking position X, first, the restricting portion 60 pushes the pressing portion 54 downward to swing the lock member 23 in the engaging direction. Thereafter, the first push piece 58 pushes the operation 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 interlocking tool 27 moves to the lock position X, the pressing portion 54 and the restricting portion 60 face each other, and the separation preventing means 30 prevents the lock member 23 from swinging in the separation direction. As a result, the lock member 23 engages with the locked portion 11 of the leg column 9, and thereby the leg column 9 is locked so as not to move with respect to the column main body 8. Moreover, the disengagement preventing means 30 can prevent the lock member 23 from swinging in the disengagement direction, and the leg column 9 can be reliably prevented from unexpectedly expanding and contracting relative to the column main body 8.

  Therefore, when the interlocking tool 27 moves to the lock position X, the interlocking member 29 engages the lock member 23 with the leg column 9 and at the same time, the disengagement preventing unit 30 causes the lock member 23 to engage with the leg column 9. It is possible to prevent accidental disconnection. In addition, when the interlocking tool 27 is disengaged from the lock position X, the disengagement preventing means 30 allows the lock member 23 to swing, and the movement of the interlocking tool 27 from the lock position X to the unlocking position Y causes the lock member 23 to move. It is possible to easily change and change the engagement with the pedestal 9 and the detachment from the pedestal 9, and the expansion / contraction adjustment can be easily performed.

  Further, since the long operation member 69 is disposed along the outer surface of the column main body 8, the lock mechanism 7 and the long operation member 69 do not interfere with the use of the stepladder 1. Moreover, since the lock mechanism 7 and the long operation member 69 are disposed outside the leg column 9, the leg column 9 can be formed of a cylindrical body, which is advantageous in terms of strength. Further, by using the long operation member 70, it is possible to easily operate the engagement of the lock member 23 to the leg column 9 and the disengagement from the leg column 9 from a place away from the lock mechanism 7.

The invention according to the present embodiment is not limited to the above embodiment. In said embodiment, although the expansion / contraction apparatus was applied to the stepladder 1 which has the support | pillar 5 which can be expanded-contracted, it may replace with this and you may apply an expansion / contraction apparatus to the ladder 2, a scaffolding stand, etc.
Further, the extendable body is not limited to the support column 5 composed of the support column main body 8 and the pedestal column 9, and the extendable body may be a member that expands and contracts as a whole when the pedestal column 9 is inserted into a cylindrical member.

  Further, in the above embodiment, when the interlocking tool 27 moves from the unlock position Y to the lock position X, first, the restricting portion 60 pushes the pressing portion 54 downward to swing the lock member 23 in the engaging direction. After that, the first pushing piece 58 pushes the operating piece 55 downward. Instead, when the interlocking tool 27 moves from the unlocking position Y to the locking position X, The lock member 23 may be swung in the engaging direction only when the one pushing piece 58 pushes the operation piece 55 downward.

1 Stepladder (extension device)
2 Ladder 5 Strut (Elastic body)
6 Treadle member 7 Lock mechanism 8 Prop body (outer body)
9 pedestal (insert)
DESCRIPTION OF SYMBOLS 10 Opening groove 11 Locked part 13 Retaining member 18 Supporting frame 21 Insertion space 23 Lock member 24 Pivot shaft 25 Handle 27 Interlocking tool 29 Interlocking means 30 Detaching prevention means 41 Gripping part 42 Actuating part 54 Pressing part 55 Operation piece 58 First pushing piece 59 Second pushing piece 60 Restricting part 65 Idle gap 67 Interlocking tool pushing means 69 Long operating member 70 Operating part 77 Lower guide member 82 Linked body 90 Coil spring 91 Energizing member

Claims (4)

A lock mechanism (7) is provided for inserting the insert (9) into the outer shell (8) in a telescopic manner and fixing the insert (9) in the extended position to the outer shell (8). 7) is a support frame (18) fixed to the outer casing (8), and is pivotally supported with respect to the support frame (18) so as to be engaged with the locked portion (11) of the insert (9). A locking member (23) to be engaged,
When the interlocking tool (27) is supported by the support frame (18) so as to be movable between the lock position (X) and the unlocking position (Y), and the interlocking tool (27) moves to the lock position (X). Interlocking means for engaging the locking member (23) with the insertion body (9) and detaching the locking member (23) from the insertion body (9) when the interlocking tool (27) moves to the unlocking position (Y). (29) and when the interlocking tool (27) is moved to the lock position (X) to prevent the locking member (23) from swinging and the interlocking tool (27) is released from the lock position (X). And a disengagement preventing means (30) for allowing disengagement swinging of the lock member (23). The interlocking means (29) includes an operation piece (55) protruding from a lock member (23) pushed by the movement of the interlocking tool (27), and the operation piece (55) in the moving direction of the interlocking tool (27). A first pusher piece (58) and a second pusher piece (59) projecting from the interlocking tool (27) so as to be sandwiched between the interlocking tool (27) and the interlocking tool (27) moving to the lock position (X). When the first pushing piece (58) pushes the operating piece (55) to swing the locking member (23) in the engaging direction, and the interlocking tool (27) moves to the unlocking position (Y). The second push piece (59) is configured to push the operation piece (55) so as to swing the lock member (23) in the disengagement direction,
The detachment preventing means (30) includes a pressing part (54) projecting toward the interlocking tool (27) on the rocking end side of the lock member (23), and a pressing part (54) on the interlocking tool (27). And a restricting part (60) projecting toward the door, and when the interlocking tool (27) moves to the lock position (X), the pressing part (54) and the restricting part (60) face each other. The restriction part (60) is configured to be disengaged from the position opposed to the pressing part (54) when (27) is disengaged from the lock position (X),
When the interlocking tool (27) moves from the lock position (X) to the lock release position (Y), the lock member (23) swings away after the restricting portion (60) is disengaged from the pressing portion (54). The telescopic device according to claim 1, characterized in that an idle gap (65) is formed between the second push piece (59) and the operation piece (55) so as to be started. An urging member (91) for urging the interlocking tool (27) to the lock position (X) is provided, and the lock mechanism (7) pivotally supports the lock member (23) in a swingable manner (24). ) And a handle (25) supported by the pivot shaft (24). The handle (25) is connected to the gripping part (41) and the gripping part (41) to the interlocking tool (27) side. And an operating portion (42) protruding to
An interlocking tool that pushes the interlocking tool (27) to the unlocking position (Y) against the biasing force of the biasing member (91) by rotating the handle (25) around the pivot shaft (24). The telescopic device according to claim 1 or 2, wherein the pushing means (67) is provided between the gripping part (41) and the interlocking tool (27). The insertion body (9) is inserted into the outer casing (8) to form the expansion / contraction body (5). ) To form a ladder (2), and a locking mechanism (7) is provided on each facing surface of the left and right outer shells (8), and the interlocking tool (27) is opposed to the outer shell (8). The expansion / contraction apparatus according to any one of claims 1 to 3, wherein the expansion / contraction apparatus is held so as to be movable in the longitudinal direction along the surface.

Images