JPH0756480Y2 - Stepping device for tripod type self-supporting ladder - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention includes a pair of ladder columns,
The present invention relates to a tripod type self-supporting ladder which is pivotally connected to one self-supporting column at each upper end portion thereof so as to be self-supporting in a tripod type.

[0002]

2. Description of the Related Art As shown in FIG. 6, when a worker works at a high place such as pruning trees in a landscaping or an orchard, the unevenness of the ground is severe and unstable. A self-standing ladder cannot be used, and a tripod type self-supporting ladder having a so-called three-point support structure is used.

As shown in FIG. 6, this tripod type self-supporting ladder has a pair of ladder columns 2 and 3 for bridging ladder ladders 1 at appropriate intervals in the longitudinal direction, and a foot rail 4 for footing near the upper end. It consists of one self-supporting prop 5 to be installed, and both props 2, 3, 5
The upper end of the is spread as an A-shape as a pivot point 6 and is used as a tripod type self-supporting. This ensures that the ladder can stand on its own even if the ground is unstable.

As described above, in the tripod type self-supporting ladder, in order for an operator to rest his / her both feet at the upper end portion thereof as shown in FIG. 6, the ladder rung 1 bridged to the pair of ladder posts 2 and 3 is provided. Besides, a foot rail 4 is horizontally projected near the upper end of the self-supporting column 5 by welding so as to be opposed thereto.

[0005]

As described above, the footrest 4 is considerably protruded in the horizontal direction from the self-supporting column 5 so that the worker can work stably. As a result, as shown in FIG. Even when both pillars 2, 3 and 5 are pulled close to each other and folded down to make them bulky, only the footrest 4 is considerably protruding from the self-supporting pillar 5 as indicated by L, which is why the footrests are carried during transportation or storage. There is a problem in that the crossing bar 4 becomes an obstacle and becomes bulky.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to fold the tripod type self-supporting ladder as low as possible, and to keep the transportation cost and storage space low. The purpose is to be able to.

[0007]

In order to achieve the above-mentioned object, in claim 1 of the present invention, a pair of bridge ladders 1 are bridged by the reference numerals attached to the embodiments. Of the ladder columns 2 and 3 and a single self-supporting column 5 having a step rail 4 projecting near the upper end are pivotally attached at their respective upper ends to be used as a tripod type. In the tripod ladder, as shown in FIGS. 2 and 3, the footrest 7 is used.
Is loosely fitted to the self-supporting column 5 to surround the outer peripheral surface of the self-supporting column 5.
The cylindrical body 8 that can be rotationally displaced in the direction
It is composed of the stepping frame 9 which is integrally projected in the direction.
Use the projecting frame 5 and the step frame 9 for self-supporting
Buried position displaced to the columns 2 and 3 for the ladder facing the column 5.
Locking means 10 for maintaining the device without displacement
The self-standing ladder 5 and the footrest 7
Is adopted.

[0008]

[0009] In the second aspect, as shown in FIG. 2, claim in which the foot hold for踏桟7 in the free-standing upright 5 is provided with a stopper 11 for preventing the falling off downward together The configuration described in 1 or 2 is adopted.

[0010]

According to claim 1 of the present invention, since the footrest 7 is provided so that the outer peripheral surface of the self-supporting support 5 can be displaced in the circumferential direction, the footrest 7 is not used, transported or stored. 7 is displaced to the side of the ladder columns 2 and 3 facing the self-supporting column 5 and folded, so that the footrest 7 for the footrest becomes the ladder columns 2 and 3.
Also, it does not project from the folded state of the self-supporting column 5.

According to the first aspect of the present invention, the footrest crossing bar 7 is loosely fitted to the self-standing column 5 and the outer peripheral surface of the self-standing column 5 is rotatably displaced in the circumferential direction. It comprises a step frame 9 which is integrally provided on the tubular body 8 so as to project in the horizontal direction, and instead of welding the conventional foot frame 4 to the self-supporting column 5, the step frame of the foot frame 7 is used. It is only necessary to weld 9 to the tubular body 8.

Further, the tread frame 9 is maintained in the use position in which it projects from the self-supporting column 5 and the buried position in which the step frame 9 is buried on the side of the ladder columns 2 and 3 facing the self-standing column 5. Cross frame 9
Locking means 10 for restricting displacement of the vehicle from both positions
Is provided over the self-supporting ladder 5 and the footrest pedestal 7, so that the worker can work safely when using the footrest pedestal 7, and the footrest pedestal 7 can be safely used when not in use, especially during transportation. Since it does not displace from the self-supporting column 5, it is not damaged or given a danger due to shock or vibration during transportation.

According to claim 2 , the self-supporting support column 5
In addition, since the stopper 11 for preventing the footrest pedestal 7 from moving downward is integrally provided, the footrest pedestal 7 falls down even if the operator puts his / her weight on the footrest pedestal 7. There is nothing to do.

[0014]

EXAMPLE As shown in FIG. 1, a pair of ladder columns 2, 3
Is formed into a substantially eight-shape and spreads toward the end, and ladder ladders 1 are bridged between both columns 2 and 3 at appropriate intervals from the lower end to the upper end. Reinforcing vertical bars 12 (also shown in FIG. 4) are attached along the columns 2 and 3 to reinforce them. The uppermost step 13 is attached to the upper ends of the ladder columns 2 and 3 and the self-supporting column 5, respectively, of which the ladder columns 2 and 3 and the uppermost step 13 are fixed at a predetermined angle. The self-supporting column 5 and the uppermost step 13 are pivotally attached to the uppermost step 13 by the pivot shaft 6 so that the self-supporting column 5 is rotatable. Therefore, at the time of folding, as shown in FIG. 4, the ladder columns 2 and 3 and the self-supporting column 5 are attracted to each other around the pivot point 6. A foot rail 7, which is an essential part of the present invention, is attached near the upper end of the self-supporting column 5.

As shown in FIGS. 2 and 3, the stepping bar 7 for legs is composed of a tubular body 8 which is loosely fitted to the self-supporting support column 5 and a stepping bar frame 9 which horizontally projects from the tubular body 8. The tubular body 8 is made of an aluminum pipe, and the step frame 9 is formed by bending an aluminum rod so as to surround the outer peripheral surface of the tubular body 8 to form a lattice, as shown in FIG. The foot frame 15 is horizontally projected from the tubular body 8 by welding the tip portion 14a and the bent portion 14b of the tubular body 8 to the tubular body 8, and the aluminum rod is bent into a substantially U-shape and bent. The portion 14c is surrounded by the tubular body 8 and both are fixed by aluminum welding, and the tip end portion is aluminum-welded to the footing frame 15 so that the reinforcing frame 16 is integrally attached to the footing frame 15 and the tubular body 8. It will be.

Further, as shown in FIG. 2, a ring-shaped stopper 11 is fitted to the self-supporting column 5 and its predetermined position 14
Similarly, the stopper 11 is fixed to the self-supporting column 5 by aluminum welding at d. Therefore, the tubular body 8 of the footrest 7 is restricted by the stopper 11 so that the self-supporting strut 5 is supported.
It does not fall downward from the predetermined position.

Further, between the tubular body 8 and the self-supporting support column 5,
Locking means 10 is provided for restricting the footrest 7 from shifting the outer peripheral surface of the self-supporting column 5 in the circumferential direction.

As shown in FIG. 2, the locking means 10 is provided with through holes 17a and 17b which are horizontally aligned with each other over the tubular body 8 and the self-supporting support column 5, and a substantially L-shaped lock pin 18 is inserted therein. However, it has a structure in which it is held by a latch 19 at the tip of the lock pin and a spring 20 at the rear end of the lock pin so as to maintain a locked state. The projecting position from the self-supporting column 5 is maintained without displacement.

FIG. 4 shows ladder columns 2 and 3 and self-standing column 5.
Shows a state in which the and are pulled toward each other around the pivot point 6 and folded, and at this time, the lock pin 18 of the lock means 10 is once provided with both through holes 17 of the self-standing column 5 and the tubular body 8.
a, 17b, as shown in FIG. 5, via the tubular body 8 so that the step frame 9 of the step rail 7 for footrest is displaced to the side of the ladder columns 2 and 3 facing the self-standing column 5. The frame 7 is circumferentially displaced on the outer peripheral surface of the self-supporting column 5 (FIG. 4), and the lock pin 1 is placed at a position where both through holes 17a and 17b are aligned again.
As shown in FIG. 4, by inserting 8 into both through holes 17a and 17b and locking them, the footrest 7 is buried in the ladder columns 2 and 3 so as not to project from the self-supporting column 5. It can be kept in position. 2 and 5, reference numeral 21 is a chain for locking the lock pin 18 to the stopper 11.

[0020]

As described above, according to the first aspect of the present invention, since the footrest for crossing the foot is provided so that the outer peripheral surface of the self-supporting column can be displaced in the circumferential direction, it is not used, transported or stored. If you fold the footrest step pedestal by displacing it toward the ladder column side facing the self-supporting column, it will not be bulky because the footrest step column does not project from the folded state of the ladder column and the self-supporting column. It can be folded compactly, and it can be efficiently operated with the minimum space required for transportation or storage.

According to the first aspect of the present invention, the footrest crosspiece is loosely fitted to the self-supporting column so that the outer peripheral surface of the self-supporting column can be rotationally displaced in the circumferential direction. It consists of a horizontal hull that projects integrally, and instead of welding it to a self-supporting strut as compared to the conventional footrest, it is only necessary to weld the horizontal frame to the tubular body. , The production cost hardly increases.

Further, the locking means for restraining the displacement of the step frame is self-supported by the use position where the cross frame is projected from the self-supporting prop and the buried position where the step cross frame is displaced to the side of the ladder prop facing the self-support column. Since it is installed over the ladder and footrest, the worker can work safely while using it, and the footrest is displaced from the self-supporting prop when not being used, especially during transportation that is subject to vibration. Since it does not occur, it is practical without being damaged by shock or vibration during transportation and giving no danger.

According to the second aspect of the present invention, the self-supporting column is integrally provided with a stopper for preventing the footrest crossing bar from moving downward. Even if it is hung up, the step rail for stepping does not fall down, and it can be used safely from this aspect.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a front view showing a main part of the embodiment.

FIG. 3 is a perspective view showing a main part of the embodiment.

FIG. 4 is a front view showing a folded state of the embodiment.

FIG. 5 is a front view of a main part of the same embodiment in a folded state.

FIG. 6 is a diagram showing a usage state of a conventional technique.

FIG. 7 is a front view showing a folded state of the related art.

[Explanation of symbols]

 1 Ladder Struts 2 Ladder Struts 3 Ladder Struts 5 Self-Standing Struts 6 Pivot Points 7 Foot Straddle Strands 8 Cylindrical Body 9 Step Ladder Frames 10 Locking Means 11 Stoppers

Claims (2)

[Scope of utility model registration request] 1. A tripod type in which a pair of ladder columns for bridging ladder columns and one self-supporting column projecting footrests near the upper ends are pivotally attached at their respective upper ends. in the tripod type ladder to be used so as to free standing on, the foot hold
The support rail is loosely fitted to the self-supporting prop so that the outer peripheral surface of the self-supporting prop is secured.
A cylindrical body that can be rotationally displaced in the circumferential direction and a horizontal direction on the cylindrical body.
It is composed of a stepping frame that projects integrally with the
Use position protruding from the pillar and the traverse frame facing the self-supporting prop
To keep the buried position displaced to the side of the ladder
Locking means for self-supporting ladders and footrests
A tripod device for a tripod type self-supporting ladder. 2. The foot rail for lowering the foot is mounted on the self-supporting pillar.
Be sure to provide an integrated stopper to prevent
The tripod device of the tripod type self-supporting ladder according to claim 1 .