JPH0429036Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is suitable for use when workers climb ladders to work at relatively high places, such as when caring for garden trees, working in orchards, or gardens. , relates to a so-called self-supporting ladder in which the ladder itself is supported in a self-supporting manner because there is no place to lean the ladder against.

(Prior art) As a self-supporting ladder of this type, for example, a vertically trapezoidal ladder in which a pair of side pillars are formed in an approximately figure-eight shape with a tread between them, such as a tripod ladder, is constructed with one supporting leg. There is a self-supporting ladder that is supported by This three-legged self-supporting ladder has a fairly wide space between the pillars on both sides at the ground contact point, making it very stable.However, on the other hand, having a wide space between the pillars on both sides means that the ladder itself becomes bulky, making it difficult to transport. , it is inconvenient to store, and the steps near the grounding part naturally become long, which weakens the strength.Furthermore, in manufacturing, the ladder must be formed into a special vertical trapezoidal shape as described above. However, the problem was that it was expensive.

(Problems to be Solved by the Invention) Therefore, the object of the present invention is to propose a self-supporting ladder that is stable and convenient for transportation and storage without using a bulky vertically elongated trapezoidal ladder.

(Technical means for solving the problem) In order to solve the above problem, the present invention
A pivot shaft 7 parallel to the rung 2 is rotatably provided at the upper half of the parallel ladder 1, which is made up of a parallel ladder 1 and a pair of side posts 3, 3 provided parallel to both ends thereof. The rods 8 and 9 are fixed so as to protrude opposite each other in a substantially figure-eight shape, and the opposing distance t between the tips of the two short rods 8 and 9 is formed to be approximately the same as the width of the parallel ladder 1. . A pair of support legs 4 and 5 are connected to a parallel ladder 1
It adopts a structure in which it is rotatable back and forth and detachable.

(Function) The parallel ladder has three points due to the pair of relatively narrow side posts 3 and 3 of the parallel ladder 1 and the pair of support legs 4 and 5 that extend outward from the parallel ladder 1 in an approximately figure eight shape. Stable and independent with support.

When the parallel ladder 1 stands on its own, the short rods 8 and 9 protruding from the pivot 7 and the tubular support legs 4 and 5 fitted thereto are pressed against each other by their own weight, and the short rods 8 and 9 By simply fitting the support legs 4 and 5 to the support legs 4 and 5, each short rod and the support leg are regulated on the same axis, and since the opposing angles of the support legs 4 and 5 are fixed, the short rods 8 and 9 There is no positive need for fixing means between the support legs 4 and 5.

The support legs 4, 5 are simply fitted to the short rods 8, 9, and the short rods 8, 9 can be removed from the support legs 4, 5, so when not in use, the support legs 4, 5 can easily be used as a parallel ladder. 1 can be separated.

(Example) In the example shown in the drawings, the parallel ladder 1 is the lower ladder 1a.
and an upper ladder 1b which is connected to this and extends upwardly from this in a telescopic manner, and a lower ladder 1
A pivot 7 is parallel to the step 2 and is rotatable in bearings 6, 6 fixed to the pillars 3, 3 on both sides by screws or the like in the vicinity of the step 2 one or two steps below the top step 2a of a. As shown in FIG. 2, a pair of short rods 8 and 9 are fixedly supported downwardly in a figure-eight shape and are protruded from this pivot 7 by means such as welding, as shown in FIG. The opposing distance t between the ends of the short rods 8 and 9 is made to be approximately the same as the width of the parallel ladder 1. Therefore, the pair of short rods 8 and 9 are rotatable together with the pivot shaft 7 in a substantially figure-eight shape corresponding to the required angle, and
When both the short rods 8 and 9 are folded along the parallel ladder 1, the tips of both the short rods 8 and 9 are formed so as not to protrude from the sides of the parallel ladder 1.

As shown in FIG. 3, tubular support legs 4 and 5 are removably fitted into the pair of short rods 8 and 9, respectively, and nut-shaped nuts welded to the support legs 4 and 5 are attached to the support legs 4 and 5, respectively. The female threaded portion 10 and the presser bolt 11 screwed into the female threaded portion 10 are attached, and the presser bolt 11 is attached when fitted.
Although the short rods 8 and 9 are pressed against each other to prevent them from coming apart, the holding bolt 11 may not be provided as will be described later.

An adjustment leg 12 is fitted to the lower part of the support legs 4 and 5, and an adjustment hole 13 is provided in the adjustment leg 12 at an appropriate interval in the longitudinal direction, and a mounting hole 1 is provided in the support leg 4 and 5.
By inserting a support pin 15 across the support legs 4 and 4, the overall length of the support legs 4 and 5 can be adjusted. In addition, 16 and 17 are the side pillar 3 and the adjustable leg 1.
This is a well-known grounding plate that is pivoted to the ground plate 2. Further, in FIG. 1, reference numeral 18 denotes a support leg distance maintaining strap detachably suspended between the support leg 5 of one side column 3 via a hook 19.

As shown in FIG. 1, a pair of support legs 4 and 5 are fitted to short rods 8 and 9, respectively, and both support legs are extended forward from side columns 3 and 3 using the pivot 7 as a fulcrum to form a parallel ladder 1. In order to stably stand up on its own by being supported at three points by the side pillar itself and a pair of support legs 4 and ₅ , the distance between the opposite sides of both support legs 4 and 5 should be It is preferable to determine the mounting angle of the pair of short rods 8, 9 so that _l2 is 3 to 5 times as wide, preferably 4 to 5 times as wide. Note that when the parallel ladder 1 stands on its own, the short rods 8 and 9 and the tubular support legs 4 and 5 externally fitted thereon are pressed against each other by their own weight and do not physically separate, so the above-mentioned presser foot Although it is not necessary to provide the bolt 11, it is better to provide the bolt in order to prevent attachment and detachment during short-distance movement.

Figure 2 shows the support leg 4 from the short rods 8 and 9 of the parallel ladder.
In this state, the short rods 8 and 9 do not protrude from both side pillars 3 and 3 on both sides as shown in the figure, so the overall size is not bulky.

Figure 4 shows the upper ladder 1b of the double ladder and the lower ladder 1.
It shows a state in which it is used by extending it from a to a high place A such as a high-rise building, and in this case, the lower ladder 1a
By grounding both supporting legs 4 and 5 which are pivotally connected to the ladder, it is possible to support the long double ladder and prevent the occurrence of deflection and galling of the elastic friction portions of both the upper and lower ladders.

(Effects) According to the present invention, a self-supporting ladder can be manufactured using a normal parallel ladder, and since the structure is simple, manufacturing costs can be reduced.

According to the present invention, since the parallel ladder is provided with a pair of support legs extending outward in a substantially figure-eight shape, the parallel ladder can be stably made to stand on its own by so-called three-point support.

According to the present invention, since both support legs are provided at the upper middle part of the parallel ladder, the upper part of the parallel ladder functions as a kind of handrail when in use, making it easy to use.

According to the present invention, the extension of the upper ladder is achieved by forming the parallel ladder into a double ladder consisting of a lower ladder provided with a pair of support legs and an upper ladder connected to the lower ladder and thereby extending telescopically upward. When in use, the support legs can be used as reinforcing bars.

According to the present invention, since the support legs are simply fitted to the pair of short rods protruding from the parallel ladder, both support legs can be easily removed from the parallel ladder, making it easy to handle during transportation or storage. advantageous to

According to the present invention, since the distance between the opposing ends of the pair of short rods is formed to be approximately the same as the width of the parallel ladder, the supporting legs can be separated from the pair of short rods protruding from the parallel ladder. When a pair of short rods are folded along a parallel ladder, both short rods do not protrude laterally from the parallel ladder, and can be folded compactly, without taking up bulk when transported or stored.

According to the present invention, when in use, the opposing angles of the pair of support legs, which are provided on the parallel ladder in a substantially figure-eight shape and extending toward each other, extend in a fixed manner, so that both support legs do not wobble during use. Parallel ladders can be made to stand on their own in a stable manner.

According to the embodiment of the present invention, the length of the pair of support legs is adjustable, so it can be easily adapted to cases where the ground surface is uneven or when used as a double ladder. .

According to the embodiment of the present invention, the spacing between the pair of supporting legs pivotally connected to the parallel ladder is set to be 3 to 5 times the width between the pillars on both sides of the parallel ladder.
It effectively demonstrates the point support function and allows the parallel ladder to stand on its own with even more stability.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a perspective view, FIG. 2 is a front view, FIG. 3 is a longitudinal sectional side view of a main part, and FIG. 4 is a side view showing an example of a state of use. 1...parallel ladder, 1a...lower ladder, 1b...
Upper ladder, 2... Step rung, 3, 3... Side post, 4, 5
... A pair of support legs, 7 ... Pivot, 8, 9 ... Short pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A parallel ladder consisting of a treadle and a pair of side posts provided parallel to each other at both ends thereof is provided with a pivot shaft parallel to the treadle in a rotatable manner in the upper part of the ladder; A pair of short rods are fixed so as to protrude oppositely in a substantially figure-eight shape, and the spacing between the ends of both short rods is formed to be approximately the same as the width of the parallel ladder, and a tubular support is attached to each of the short rods. The legs are removably fitted, so that the pair of support legs, which extend from the upper middle part of the parallel ladder in a substantially figure-eight shape with fixed opposing angles, are moved back and forth with respect to the parallel ladder. A self-supporting ladder that is rotatably and removably provided. 2. The parallel ladder is a self-supporting ladder according to claim 1, which is comprised of a lower ladder to which a pair of support legs are pivotally connected, and an upper ladder connected to the lower ladder and extending telescopically upward from the lower ladder. 3. The self-supporting ladder according to claim 1 or 2 of the utility model registration claim, in which the pair of support legs are provided so that their lengths can be freely adjusted. 4 For the opposing width between both side pillars of the parallel ladder, the opposing distance between the pair of supporting legs pivoted thereon should be 3 to 3.
A self-supporting ladder according to any one of claims 1 to 3 of the claims for utility model registration, which is formed into a five-fold structure.