JP3955670B2 - Telescopic tube structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic tube structure including an outer tube and an inner tube, and more particularly to a telescopic tube structure of a lifting frame and an opening frame used for a ladder, a ladder-ladder stepladder, a stepladder, a work platform, a work tower, and the like.
[0002]
[Prior art]
Conventionally, for example, a work platform 80 shown in FIG. 11 includes a scaffold plate 82 made of a horizontally long rectangular plate having a work floor surface 81 on its upper surface, and upper and lower ends of the scaffold plate 82 folded on the left and right ends of the scaffold plate 82. A pair of support legs 86 and 87 that are foldably connected via 84 and whose lower ends are placed on the floor surface 85 are provided.
[0003]
Here, the support legs 86 and 87 are configured as a lifting frame having a telescopic tube structure. That is, the support leg 86 (the support leg 87 is the same), as shown in FIG. 11, a pair of support columns 88 and 89 extending in the vertical direction with a predetermined interval, and the vertical direction between the support columns 88 and 89. It is formed from a plurality of step bars 90 that are horizontally mounted at intervals. In addition, as shown in FIG. 12, each support 88 (the same as the support 89) is a telescopic leg (inner) having a hollow rectangular cross section in a main leg (forming an outer tube) 91 having a hollow rectangular cross section. It has a telescopic tube structure in which 92 is slidably fitted. Further, a rack groove 93a is provided on the outer surface of the telescopic leg 92, and rack teeth provided in the fixing device 93 and urged in an engagement direction by a spring are detachably engaged with the rack groove 93a. be able to.
[0004]
Therefore, after extending the telescopic leg 92 to the main leg 91 by an arbitrary length, the height from the floor surface 85 to the scaffold plate 82 is adjusted by engaging the rack teeth with the rack groove 93a by the fixing device 93. can do.
[0005]
[Problems to be solved by the invention]
However, the above-described telescopic tube structure of the lifting frame still has the following problems to be solved.
That is, the operation of adjusting the height from the floor surface 85 to the scaffolding plate 82 is performed by first pressing the operation lever 94 of the fixing device 93 with a constant pressing force to release the rack teeth from the rack groove 93a, and then the telescopic legs. 92 is slid relative to the main leg 91, and then the pressing force of the operation lever 94 is released, and the rack teeth are engaged with the rack groove 93a.
However, as shown in FIG. 11, the fixing device 93 is exclusively located in the middle portion of the support legs 86 and 87, and is disposed inside the columns 88 and 89. Moreover, the fixing device 93 is disposed between the tread bars 90.
[0006]
Therefore, the operator cannot operate the foot to adjust the height from the floor surface 85 to the scaffolding plate 82 by operating the fixing device 93. It is necessary to operate the fixing device 93 by hand. Further, in order to press the operation lever 94, a considerable pressing force may be required due to the biting of a foreign substance, but since it is manually operated, there is a possibility that a sufficient pressing force cannot be generated.
This invention is made | formed in view of such a situation, and it aims at providing the expansion-contraction pipe | tube structure which can perform an expansion-contraction operation | movement easily and reliably by using a leg | foot etc.
[0007]
[Means for Solving the Problems]
The telescopic tube structure according to claim 1, which meets the object, includes an outer tube, an inner tube slidably fitted into the outer tube, and fixing the inner tube to the outer tube at a predetermined sliding position. In a telescopic tube structure comprising a fixing device capable of
The fixing device includes an engagement groove formed of a plurality of through holes formed on one side wall of the outer tube at an interval in the axial direction, and is disposed in the inner tube and is detachable from the engagement groove at a tip portion. An engaging claw advancement / retraction member having an engagement claw engageable with the inner claw, and a distal end of the engagement claw advancement / retraction member that is engaged with the base of the engagement claw advancement / retraction member via an operating rod connection mechanism. And an operating rod with the proximal end led out from the end of the inner tube ,
The outer tube is formed by a fixed leg, Ru used support leg the inner pipe is formed by stretching the legs.
[0008]
[0009]
The telescopic tube structure according to claim 2 , wherein a fixed leg having a hollow rectangular cross section, a telescopic leg having a hollow rectangular cross section slidably fitted in the fixed leg, and a predetermined slide on the telescopic leg with respect to the fixed leg. In the telescopic tube structure comprising a fixing device that can be fixed at a position, the fixing device includes a plurality of engagement grooves formed on one side wall of the fixing leg at intervals in the axial direction, and the telescopic leg. And both ends are fixed to the inner surface of the telescopic leg, and at least one side has an engaging claw retracting opening that opens toward the engaging groove, and both side plates have pivot mounting holes. A fixed frame made of a rectangular frame having a starting shaft guide vertical hole, and disposed in the fixed frame, and a base portion is pivotally connected to a lower end portion of the fixed frame by a pivot, and is attached to a front portion. An engaging claw that can be advanced toward the engaging groove through the engaging claw retracting opening of the fixed frame. And an engaging claw advance / retreat member provided with an activation shaft guide inclined hole that aligns with the activation shaft guide vertical hole, and surrounds the fixed frame and is relatively movable in the axial direction with respect to the fixed frame A sliding frame provided with a pivot guide vertical hole that is slidably fitted into both side plates of the pivot shaft, and an activation shaft mounting hole. An activation shaft that is inserted through the activation shaft guide vertical hole and the activation shaft guide inclined hole, and whose both ends are pivotally supported by activation shaft mounting holes provided on both side plates of the sliding frame, and a tip that is slid Between the operating frame that is connected to the moving frame and whose other end is led out from the lower end of the telescopic leg, and the connecting portion that connects the upper end of the fixed frame and the upper ends of both side plates of the sliding frame A spring that is interposed between and urges the sliding frame in a direction opposite to the pulling-out direction of the operating rod. Comprising a.
Here, the fixed leg is a concept for the telescopic legs, and means all the legs that cannot move in the axial direction unlike the telescopic legs. Accordingly, even if one end is pivotally supported and swings around the pivot point, it is included in the fixed leg unless it can move in the axial direction.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Hereinafter, with reference to FIGS. 1-8, the expansion-contraction pipe | tube structure which concerns on one embodiment of this invention is demonstrated. In the present embodiment, the telescopic tube structure is applied to the telescopic tube structure of the lifting frame and the opening frame used for the work platform A.
As shown in FIG. 1, the work platform A substantially includes a scaffold plate 11 formed of a horizontally long rectangular plate having a work floor 10 on the upper surface, and upper ends of the scaffold platform A are folded and connected to the left and right ends of the scaffold plate 11. A folding frame 15 and an opening frame 16 are provided, which are foldably connected via the mechanisms 12 and 13, and whose lower ends are placed on the floor surface 14.
[0011]
Here, the lifting frame 15 extends in the vertical direction with a predetermined interval in the width direction in the side view shown in FIGS. 1, 3, and 4, and the upper end is folded and connected to the left end portion of the scaffold plate 11. A pair of left and right struts 17 and 18 connected via a mechanism 12, a plurality of step bars 19 horizontally mounted with left and right struts 17 and 18 spaced vertically, and left and right struts The lower connecting pipe 20, which is an example of an outer pipe that connects the lower ends of 17 and 18, and the upper end is pivotally supported on the outer surface of the left and right struts 17 and 18, and the lower end is the left and right struts 17. The left and right auxiliary struts 21 and 22 extend downward from the lower end surface of the floor 18 and can be grounded to the floor surface 14, and are interposed between the left and right auxiliary struts 21 and 22 and the lower connecting pipe 20. The left and right overhang adjustments are examples of inner pipes that regulate the overhang in the width direction of the right auxiliary struts 21 and 22. ; And a 23 and 24.
[0012]
As shown in FIGS. 1 and 3 to 5, the left and right auxiliary struts 21 and 22 each have a telescopic leg 26, which is an example of an inner pipe, nested in a fixed leg 25, which is an example of an outer pipe. That is, it has a telescopic tube structure that is slidably inserted in the axial direction, and includes a fixing device 27 (see FIG. 6) that can fix the telescopic leg 26 at an arbitrary sliding position (extensible position). To do. That is, the first telescopic tube structure is formed by the fixed leg 25, the telescopic leg 26 and the fixing device 27.
Further, as shown in FIGS. 1 and 3 to 5, the left and right projecting amount adjusting pipes 23 and 24 are inserted into both ends of the lower connecting pipe 20 in a nested manner, that is, slidable in the axial direction. As a result, the telescopic tube structure is formed, and the fixing device 28 is provided that can fix the left and right projecting amount adjusting tubes 23 and 24 at arbitrary telescopic positions. That is, the second telescopic tube structure is formed by the lower connecting tube 20, the left and right projecting amount adjusting tubes 23 and 24, and the fixing device 28.
[0013]
On the other hand, as shown in FIG. 1, the opening frame 16 extends in the vertical direction with a predetermined interval in the width direction, and has a pair of upper ends connected to the right end portion of the scaffold plate 11 via a folding connection mechanism 13. The left and right struts 29, 30, the lower connecting pipe 31 that connects the lower ends of the left and right struts 29, 30, and the upper ends are pivotably supported on the outer surfaces of the left and right struts 29, 30. The width of the left and right auxiliary struts 32 and 33 and the width of the left and right auxiliary struts 32 and 33 extending in the width direction can be grounded to the floor 14 by extending below the lower end surfaces of the left and right struts 29 and 30. Left and right projecting amount adjusting pipes 34 and 35 to be regulated are provided.
[0014]
As shown in FIG. 1, each of the left and right auxiliary support columns 32 and 33 has a telescopic leg 37, which is an example of an inner tube, inserted into a fixed leg 36, which is an example of an outer tube, so as to be slidably inserted. And a fixing device capable of fixing the expansion / contraction leg 37 at an arbitrary sliding position (extension / contraction position). That is, the first telescopic tube structure is formed by the fixed leg 36, the telescopic leg 37 and the fixing device. Although not shown, a fixing device that fixes the telescopic legs 37 to the fixing legs 36 also has the same configuration as the fixing device 27.
In addition, the telescopic tube structure is formed by slidably inserting left and right projecting amount adjusting pipes 34 and 35, which are examples of inner pipes, into both ends of the lower connecting pipe 31, which is an example of the outer pipes. The fixing device 39 is formed and can fix the left and right projecting amount adjusting pipes 34 and 35 at arbitrary expansion and contraction positions. That is, the second telescopic pipe structure is formed by the lower connecting pipe 31, the left and right projecting amount adjusting pipes 34 and 35, and the fixing device 39.
[0015]
The present embodiment is characterized in that, in the work platform A having the above-described configuration, the fixing device 27 in the first telescopic tube structure in the elevating frame 15 and the opening frame 16 is configured to be operated by feet. Have.
[0016]
Hereinafter, the first telescopic tube structure will be described in detail with reference to FIGS. 1 to 10, particularly FIGS. 5 to 10.
As shown in FIGS. 5 and 9, the one side wall 40 of the fixed leg 25 having a hollow rectangular cross section is provided with an engagement groove 41 including a plurality of horizontally long through holes spaced in the axial direction. A rack is formed by these engagement grooves 41. The engagement groove 41 can be formed not only by the above-described through-hole, but also on a flat plate as described in, for example, JP-A-8-68283 and JP-A-7-35119. It is also possible to form a large number of protrusions by planting them integrally or by bonding together with a parallel interval in the longitudinal direction.
On the other hand, as shown in FIGS. 6 to 9, a vertically elongated rectangular opening 43 is formed in the side wall 42 facing the one side wall 40 at the top of the telescopic leg 26 having a hollow rectangular cross section like the fixed leg 25. Yes.
[0017]
A fixed frame 44 is disposed in the upper part of the telescopic legs 26. As shown in FIG. 10, the fixed frame 44 is composed of a rectangular frame made up of left and right side plates 45 and 46 and upper and lower end plates 47 and 48. The upper and lower end plates 47 and 48 are shown in FIG. And as shown in FIG. 7, it fixes to the expansion-contraction leg 26 by connecting with the other side wall 51 of the expansion-contraction leg 26 by the fixing bolts 49 and 50, respectively.
On the front surface of the fixed frame 44, as shown in FIG. 10, an engaging claw retracting opening that opens toward the engaging groove 41 of the fixed leg 25 provided on the opening 43 and the extension 43 provided on the extension leg 26. 52 is formed.
[0018]
As shown in FIG. 10, the side plate 45, 46 of the fixed frame 44 is provided with a pivot mounting hole 53 and an activation shaft guide vertical hole 54 at positions aligned with each other in a side view.
As shown in FIGS. 6 to 10, a triangular engagement claw advance / retreat member 55 is disposed inside the fixed frame 44 in a side view, and a pivot through hole 56 is provided at the base thereof. Yes. Then, the pivot 57 is passed through the pivot through hole 56 and both ends thereof are supported by the pivot mounting holes 53 of the fixed frame 44, so that the engaging claw advance / retreat member 55 is engaged with the lower end side (one end side) of the fixed frame 44. Can be pivotally connected to each other.
[0019]
As shown in FIGS. 5 to 7 and 10, a plurality of engaging claws 58 project from the front surface (tip portion) of the engaging claw advance / retreat member 55 at intervals in the axial direction of the telescopic legs 26. And rack teeth are formed.
The engaging claw advance / retreat member 55 is formed with an activation shaft guide inclined hole 59 that penetrates the engagement claw advance / retreat member 55 in the width direction. , One end is positioned substantially immediately above the pivot through hole 56 and the other end is formed as a rearward inclined slit extending while being inclined rearward.
As shown in FIGS. 5 to 10, a sliding frame 60 made of a U-shaped frame surrounds the fixed frame 44 in the telescopic leg 26 so as to be movable in the axial direction of the telescopic leg 26. It is arranged so as to be movable relative to the fixed frame 44.
[0020]
As shown in FIG. 10, the sliding frame 60 includes left and right plates 61 and 62 and a connecting plate 63 that connects the upper ends of the left and right plates 61 and 62. In the sliding frame 60, a pivot guide vertical hole 64 is formed at a position where the pivot mounting hole 53 provided in the fixed frame 44 and the pivot through hole 56 provided in the engaging claw advance / retreat member 55 are aligned. . And both ends of the pivot 57 are pivotally supported in the pivot guide vertical hole 64 so as to be slidable in the vertical direction.
[0021]
On the other hand, as shown in FIG. 10, an activation shaft mounting hole 65 is provided at a position where the activation shaft guide vertical hole 54 provided in the fixed frame 44 and the activation shaft guide inclined hole 59 provided in the engaging claw advance / retreat member 55 are aligned. Is formed. Then, both ends of the starting shaft 64 a through which the starting shaft guide vertical hole 54 and the starting shaft guide inclined hole 59 are inserted can be supported by the starting shaft mounting hole 65.
As shown in FIGS. 6 and 7, a long operation rod 66 is concentrically disposed in the telescopic leg 26, and an engagement ring 67 is attached to the upper end (tip) of the operation rod 66. Yes. As shown in FIGS. 6 to 8, the engagement ring 67 is engaged with an engagement shaft 68 installed between the lower ends of the left and right plates 61 and 62 of the sliding frame 60, thereby 66 can be connected to the sliding frame 60. As shown in FIG. 10, engagement shaft mounting holes 69 for supporting the engagement shaft 68 are provided at the lower ends of the left and right plates 61 and 62 of the sliding frame 60.
As described above, in this embodiment, the operating rod coupling mechanism that interlocks and connects the upper end of the operating rod 66 to the base of the engaging claw advance / retreat member 55 substantially includes the fixed frame 44, the sliding frame 60, and the engagement. It is formed by the ring 67 or the like.
[0022]
On the other hand, the lower end (base end) of the operating rod 66 extends downward through an advance / retreat guide hole 71 provided in an advance / retreat guide member 70 attached to the lower end of the extendable leg 26 and bends 90 ° to bend the extendable leg 26. The foot lever 72 is formed to protrude laterally (outside) from the side surface.
Further, a spring 73 is interposed between the upper surface of the upper end plate 47 of the fixed frame 44 and the connecting plate 63 of the sliding frame 60, and the sliding frame 60 is moved in the direction opposite to the operation rod 66 from the fixed frame 44. That is, it is biased upward (in the direction opposite to the pulling-out direction).
[0023]
Next, the operation of the telescopic tube structure having the above-described configuration will be described.
In order to adjust the height of the work floor 10 of the work platform A, when the telescopic leg 26 is pulled out from the fixed leg 25, first, a step lever 72 provided at the lower end of the telescopic leg 26 is stepped on and the operation rod 66 is moved. Pull down. By the pulling operation of the operating rod 66, the sliding frame 60 is lowered in the fixed leg 25, and the starting shaft 64a integrated with the sliding frame 60 is also lowered. Since the starting shaft 64a is fitted in the starting shaft guide inclined hole 59, the engaging claw advance / retreat member 55 rotates rearward around the pivot 57 by the lowering of the starting shaft 64a. By this rotation, the engagement claw 58 provided on the front surface of the engagement claw advance / retreat member 55 is retracted from the engagement groove 41 provided on the fixed leg 25 and released. Therefore, the telescopic leg 26 can be pulled out from the fixed leg 25 by a predetermined length. As the sliding frame 60 is lowered, an urging force is generated in the spring 73 interposed between the upper surface of the upper end plate 47 of the fixed frame 44 and the connecting plate 63 of the sliding frame 60. .
[0024]
In this way, after the telescopic leg 26 is pulled out by a predetermined length and then the pulling force of the operating rod 66 is released, the upper surface of the upper end plate 47 of the fixed frame 44 and the connecting plate 63 of the sliding frame 60 are removed. Due to the biasing force of the interposed spring 73, the engaging claw advance / retreat member 55 rotates forward around the pivot 57, and the engaging claw 58 provided on the front surface thereof advances toward the engaging groove 41 and again. The telescopic legs 26 can be firmly fixed to the fixed legs 25 by being fitted into the engaging grooves 41.
[0025]
Thus, in this embodiment, the operator can operate the fixing device 27 in a normal posture using his / her legs without bending his back, so the operability of the telescopic tube structure can be improved. The height adjustment work of the work floor 10 of the work platform A can be easily and quickly performed. Further, since the fixing device 27 is substantially housed in the telescopic legs 26, it is possible to prevent accidents such as collision with external objects and damage.
[0026]
The other configuration in the above-described embodiment will be described. As shown in FIGS. 7 and 10, the tip portion of the starting shaft guide inclined hole 59 provided in the engaging claw advance / retreat member 55 is convex toward the front. In the state where the activation shaft insertion groove 73a is formed and the engagement claw 58 is inserted into the engagement groove 41 and the telescopic leg 26 is fixed to the fixed leg 25, the activation shaft 64a is formed in the activation shaft insertion groove 73a. It is inserted. Therefore, in this state, even if the pressing force from the direction orthogonal to the axis of the telescopic leg 26 acts on the engaging claw advance / retreat member 55, the activation shaft 64a is prevented from moving along the activation shaft guide inclined hole 59. Therefore, it is possible to prevent the telescopic leg 26 from being erroneously released from the fixed leg 25 by the backward rotation of the engaging claw advance / retreat member 55.
[0027]
The fixing devices 28 and 39 shown in FIG. 1 have the same configuration as the fixing device previously disclosed by the present applicant in JP-A-9-177460. That is, in FIG. 3, a leaf spring is bent and housed in a U shape inside the ends of the left and right overhang adjustment tubes 23 and 24, and a convex portion is formed at one end of the leaf spring. The protrusions are engaged with holes formed in the left and right projecting amount adjusting pipes 23 and 24, and positioning pins 74 are attached to the other ends of the leaf springs, and positioning holes 75 provided on the side wall of the lower connecting pipe 20 and The through holes provided in the left and right overhang adjustment pipes 23 and 24 can be inserted. The lower connecting pipe 20 is provided with a plurality of positioning holes 75 and 76.
[0028]
With this configuration, the distal end portion of the positioning pin 74 is pushed into the inner side of the lower connecting pipe 20, and the fitting state of the positioning pin 74, the positioning hole 75, and the through hole is released, so , 24 can be slidable. Further, when the positioning pin 74 comes to the position of the positioning hole 76 by sliding the left and right projecting amount adjusting pipes 23, 24, the positioning pin 74, the positioning hole 76 and the through hole are again engaged, The right projecting amount adjusting pipes 23 and 24 cannot be slid from the lower connecting pipe 20 so that the projecting amounts of the left and right projecting amount adjusting pipes 23 and 24 to the left and right outer sides can be adjusted.
[0029]
1, 3, and 4, a receiver 77 made of a short cylinder is swingably attached to the ends of the left and right projecting amount adjusting pipes 23 and 24 by a pivot pin 78. A fixed leg 25 is slidably held on the metal receiver 77. Therefore, even if the left and right overhang adjustment pipes 23 and 24 expand and contract, the metal receiver 77 swings with respect to the left and right overhang adjustment pipes 23 and 24 and slides with respect to the fixed leg 25. Therefore, the left and right projecting amount adjusting pipes 23 and 24 can be kept in a horizontal state.
[0030]
As shown in FIGS. 5 to 8, a leg socket 79 is attached to the lower end of the telescopic leg 26. The lower end of the telescopic leg 26 and the foot socket 79 are provided with cutout grooves 79a and 79b for securing the forward / backward operation of the foot lever 72.
[0031]
Although the telescopic tube structure according to the present invention has been described with respect to the telescopic tube structure composed of the fixed leg 25 and the telescopic leg 26 constituting the elevating frame 15, the fixed leg 36 and the telescopic leg 37 constituting the opening frame 16 are described. The same applies to the telescopic tube structure made of.
[0032]
As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
[0033]
【The invention's effect】
In expansion pipe structure according to claim 1, wherein, arranged the engagement claw reciprocating members constituting the main part of the fixing device for fixing the outer tube and the inner tube constituting the expansion pipe structure to the inner tube, the engaging claws Similarly, since the advancement / retraction member can be operated from the outside using an operating rod disposed in the inner tube, the fixing device can be operated at an easy-to-operate position, and the operability of the fixing device can be improved. In addition, since the engaging claw advance / retreat member is disposed in the inner tube, it is possible to prevent accidents such as contact with external objects and damage.
[0034]
The telescopic tube structure is used as a support leg in which a telescopic leg is slidably fitted to a fixed leg, and an outer tube is formed by the fixed leg and an inner tube is formed by the telescopic leg. Therefore, since the operator can operate the fixing device in a normal posture using his / her legs without bending down, the operability of the telescopic tube structure can be improved, and the work floor surface of the work scaffolding platform can be improved. Can be easily and quickly performed. Further, since the fixing device is substantially housed in the telescopic legs, it is possible to prevent an accident such as collision with an external object and damage.
[0035]
In the telescopic tube structure according to claim 2, by pulling out the operating rod with the foot, the engaging claw is surely detached from the engaging groove through the engaging claw advance / retract member, and the fixed leg and the telescopic leg are engaged. The telescopic leg can be quickly slid with respect to the fixed leg, and the pulling-out force of the operating rod can be released at any sliding position and engaged using the biasing force of the spring. The claw can be reliably engaged with the engaging groove again, and the usability of the fixing device can be improved.
[Brief description of the drawings]
[Figure 1]
It is a perspective view of the scaffold for work which comprises the expansion-contraction pipe | tube structure which concerns on one embodiment of this invention.
[Figure 2]
It is a front view of the scaffold for work which comprises the expansion-contraction pipe | tube structure which concerns on one embodiment of this invention.
[Fig. 3]
It is a side view of the scaffold for work which comprises the expansion-contraction pipe | tube structure which concerns on one embodiment of this invention.
[Fig. 4]
It is a side view of the scaffold for work which comprises the expansion-contraction pipe | tube structure which concerns on one embodiment of this invention.
[Figure 5]
It is a front view of the expansion-contraction tube structure of the raising / lowering frame which concerns on one embodiment of this invention.
[Fig. 6]
It is sectional drawing by the II line | wire of FIG.
[Fig. 7]
It is a principal part enlarged view of FIG.
[Fig. 8]
It is sectional drawing by the II-II line of FIG.
FIG. 9
It is sectional drawing by the III-III line of FIG.
FIG. 10
It is a disassembled perspective view of the principal part of a fixing device.
FIG. 11
It is a perspective view of the scaffold for work which comprises the conventional elastic tube structure.
FIG.
It is a cross-sectional view of a conventional telescopic tube structure.
[Explanation of symbols]
A Working scaffold base 10 Working floor surface 11 Scaffold plate 12 Folding coupling mechanism 13 Folding coupling mechanism 14 Floor surface 15 Lifting frame 16 Opening frame 17 Left column 18 Right column 19 Step bar 20 Lower coupling tube 21 Left auxiliary column 22 Right auxiliary column 23 Left overhang adjustment tube 24 Right overhang adjustment tube 25 Fixed leg 26 Telescopic leg 27 Fixing device 28 Fixing device 29 Left column 30 Right column 31 Lower connection tube 32 Left auxiliary column 33 Right auxiliary column 34 Left overhang adjustment tube 35 Right Overhang amount adjusting pipe 36 Fixed leg 37 Telescopic leg 39 Fixing device 40 Side wall 41 Engaging groove 42 Side wall 43 Opening 44 Fixed frame 45 Left side plate 46 Right side plate 47 Upper end plate 48 Lower end plate 49 Fixing bolt 50 Fixing bolt 51 Side wall 52 Engaging claw Entry / exit opening 53 Pivot mounting hole 54 Start shaft guide vertical hole 55 Engaging claw advance / retreat member 56 Pivot through hole 57 Pivot 58 Engaging claw 59 Starting shaft guide inclined hole 60 Sliding frame 61 Left side plate 62 Right side plate 63 Connecting plate 64 Axial guide vertical hole 65 Starting shaft attaching hole 66 Operating rod 67 Engaging link 68 Engaging shaft 69 Engaging shaft attaching hole 70 Advancement / retraction guide member 71 Advancement / retraction guide hole 72 Foot lever 73 Spring 73a Starting shaft insertion groove 74 Positioning pin 75 Positioning hole 76 Positioning hole 77 Receiving 78 Pivot pin 79 Foot socket 79a Notch groove 79b Notch groove

Claims (2)

In an expandable tube structure comprising an outer tube, an inner tube that is slidably fitted into the outer tube, and a fixing device that can fix the inner tube to the outer tube at a predetermined sliding position.
The fixing device includes an engagement groove formed of a plurality of through holes formed on one side wall of the outer tube at an interval in the axial direction, and is disposed in the inner tube and is detachable from the engagement groove at a tip portion. An engaging claw advancement / retraction member having an engagement claw engageable with the inner claw, and a distal end of the engagement claw advancement / retraction member that is engaged with the base of the engagement claw advancement / retraction member via an operating rod connection mechanism. And an operating rod with the proximal end led out from the end of the inner tube ,
The outer tube is formed by a fixed leg, telescopic pipe structure, wherein Rukoto used support leg the inner pipe is formed by stretching the legs. A fixed leg having a hollow rectangular cross section, a telescopic leg having a hollow rectangular section slidably fitted in the fixed leg, and a fixing device capable of fixing the telescopic leg to the fixed leg at a predetermined sliding position. In a telescopic tube structure comprising:
The fixing device includes a plurality of engaging grooves formed on one side wall of the fixing leg at intervals in the axial direction;
It is disposed in the telescopic leg, has both ends fixed to the inner surface of the telescopic leg, and has an engaging claw protrusion opening that opens toward the engaging groove on at least one side, and pivots on both side plates. A fixed frame comprising a rectangular frame having a mounting hole and a starting shaft guide vertical hole;
The base is pivotally connected to the lower end of the fixed frame by a pivot and is pivotally connected to the lower end of the fixed frame by the pivot. An engaging claw advancement / retraction member provided with an activation shaft guide inclined hole aligned with the activation shaft guide vertical hole,
A pivot that surrounds the fixed frame and is formed of a U-shaped frame that is movable relative to the fixed frame in the axial direction, and is slidably fitted into both side plates of the U-shaped frame at both ends of the pivot. A sliding frame provided with a guide vertical hole and a starting shaft mounting hole;
An activation shaft that is inserted through the activation shaft guide vertical hole and the activation shaft guide inclined hole and whose both ends are pivotally supported by activation shaft mounting holes provided on both side plates of the sliding frame;
An operating rod in which the tip is connected to the sliding frame and the other end is led out from the lower end of the telescopic leg,
A spring interposed between an upper end portion of the fixed frame and a connecting portion that connects upper ends of both side plates of the sliding frame, and biases the sliding frame in a direction opposite to the pulling direction of the operation rod; A telescopic tube structure comprising:

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