JPH0627757Y2 - Ladder fall arrester - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a fall prevention device for a ladder, and more specifically, to an improvement of a fall prevention device that safely supports a ladder in an upright use state. is there.

"Conventional Technology and Problems" Conventionally, many proposals have been proposed for this kind of ladder fall prevention device, and among them, the following are technical documents related to the present invention.

(3-1) There is a stable support structure for ladders in Japanese Utility Model Publication No. 55-39117. The gist of the structure is to attach a pair of legs to the lower ends of both frames of the ladder so that they can swing freely, and to attach each of the rectangular ground plates. It has a structure in which four outriggers are attached to the corners so as to extend outward and a ladder self-supporting device is further provided, and the effect is to stably and reliably support the lower ends of both frames of the ladder to the grounding surface.

(3-2) There is a ladder lateral fall prevention device of Japanese Utility Model Publication No. 59-471. The gist of the device is to form a pair of left and right pillars of the ladder with a U-shaped cross section to prevent lateral collapse of the ladder. The mounting bracket provided on the upper end of the tubular support rod is slidable up and down along the column, and it can be fixed at any position on the column by a set screw. It is to support the ladder by fixing it to the position.

Among those described in the prior art, Jitsuko 55-39117
In No. 6, the ladder can be prevented from tipping over by stable support on the ground contact surface, but it has a problem that it is inconvenient to handle because it has a complicated and large-sized support structure.

Also, in JP-B-59-471, the support rod can be easily fixed at any position, but the adjusting screw for fixing the support rod is loosened during the adjustment, so be careful not to collapse the ladder. In addition, since the support rod is tubular, the storage state when not in use becomes bulky.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is to support a ladder in an upright use state by an easy and stable adjustment and prevent its fall. The present invention provides a ladder fall prevention device that can be stored in a column of a ladder when the ladder is not used.

[Means for Solving the Problem] In order to achieve the above object, the ladder fall prevention device according to the present invention is mainly composed of a pillar having a U-shaped cross-section, an auxiliary pillar, and a glide pillar. As a constituent element, an engaging piece having a saw-toothed groove along the longitudinal direction and a flat guide rail are provided in the column, and the tip of the auxiliary column is engaged with the groove of the engaging piece of the column via a meshing relationship. It is provided with a locking frame that fits and is movable along the guide rail, and the glide column is configured to be connected between the middle portion of the auxiliary column and the column and to be pulled toward the ladder by a spring.

"Operation" When the ladder is in the upright use state, the locking frame at the tip of the auxiliary column is engaged with the groove of the engaging piece of the column at any position, and the lower end of the auxiliary column is opened to the outside of the column. In this state, the ladder is grounded, and the ladder is supported at the lower ends of the pair of left and right columns and auxiliary columns, that is, at four points, to prevent the ladder from falling.

When the ladder is not in use, the U-shaped cross-section slidable column is housed in a larger auxiliary column with a "U" -shaped cross section, and the auxiliary column is larger than that. By being housed in the pillar having a square cross section, the entire fall prevention device is housed in the pair of left and right pillars.

[Examples] Examples will be described with reference to figures.

The ladder fall prevention device is a pair of left and right columns 1, 1 and auxiliary columns 2,
2 and the pillars 3 and 3 as main constituent elements,
Auxiliary pillar 2 and shinkai pillar 3 are large, medium and small in this order.
It has a V-shaped cross-sectional shape, and the vertical columns 3 can be stored in the auxiliary columns 2, and the auxiliary columns 2 can be stored in the columns 1. Engaging pieces 4 along the longitudinal direction in the pillar 1.
Is provided with a saw-toothed groove portion 5, and similarly, a flat plate-shaped guide rail 6 is provided at a constant interval from the engaging piece 4 along the longitudinal direction. An engagement frame 7 is provided at the tip of the auxiliary column 2, and the guide rail 6 is provided on the engagement frame 7.
Is inserted, and the engagement between the locking frame 7 and the groove of the engaging piece 4 is maintained. Also,
The locking frame 7 maintains the meshing relationship with the groove portion of the engaging piece 4,
On the other hand, since the engagement frame 7 and the engagement piece 4 are in a free relationship, the engagement frame 7 is configured to move in the vertical direction while engaging with the groove portion of the engagement piece. Further, a spring 8 for pulling the slidable column 3 toward the ladder and a slip stopper 9 for preventing the slip of the ladder at the lower end are provided. In the figure, 10 is a handle provided on the auxiliary column 2.

Next, the operation will be described. When the ladder is in use, the column 1 is in an upright state, and the slip stopper 9 prevents slippage on the contact surface with the ground. Auxiliary pillar 2
Is in an open leg state, the lower end of which is in contact with the ground at the outer position of the ladder, and a rectangular frame-shaped locking frame 7 provided at the tip.
Is set to an arbitrary position by moving in the vertical direction while engaging with the sawtooth-shaped groove portion 5 formed in the engaging piece 4 in the supporting column 1 in a state where the guide rail 6 prevents the outward release. Support the upright ladder from falling. The slidable column 3 is provided between the lower end of the column 1 and the intermediate part of the auxiliary column 2, and is pulled toward the ladder by a spring 8 to assist the engagement state of the locking frame 7. With the above structure, the ladder in the upright state is stably supported, and the support state of the ladder is maintained due to the engagement due to the meshing even during the adjustment. When the ladder is not used, the pillar 1, the auxiliary pillar 2, and the shinkai pillar 3 are completely housed in the pillar 1 due to the cross section of the "U" shape that is large, medium and small in this order. Although not shown, the left and right lengths of the auxiliary column 2 can be set to be long and short, and the auxiliary column 2 can be installed even on a slope. However, in this case, three points will be supported.

"Effect of Invention" The present invention is configured as described above, and specifically,
The engagement between the groove portion of the engaging piece provided on the column and the engagement frame provided on the auxiliary column and the disengagement of the groove and the engagement frame are prevented through the guide rail, and the engagement frame of the auxiliary column is Since the auxiliary column moves up and down along the groove of the engaging piece and the auxiliary column expands and contracts, expansion and contraction of the auxiliary column can be done with one touch, and the pivoting structure of the auxiliary column is simple and easy, and can be provided at low cost. . Moreover, since the structure is simple, various failures due to the expansion and contraction of the auxiliary column are extremely small.

Further, the present invention has a structure in which the guide rail, the engaging piece, the auxiliary pillar and the slidable pillar can be completely housed in the pillar, so that the fall prevention device can be completely housed in the pillar when the ladder is not used. This facilitates the handling of the ladder.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a usage state of a fall prevention device of a ladder, FIG. 2 is a partial front view of the fall prevention device in a stored state, and FIG. 3 is a partial plan view of the fall prevention device. FIG. 4 is a perspective view of an essential part showing the engagement state of the locking frame. DESCRIPTION OF SYMBOLS 1 ... Struts, 2 ... Auxiliary columns 3 ... Sliding columns, 4 ... Engaging pieces 5 ... Grooves, 6 ... Guide rails 7 ... Locking frames, 8 ... Springs 9 ... Anti-slip pieces

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right columns that stand upright in a use state, a pair of left and right auxiliary columns that support the columns in an open state when in use, and are provided between the columns and auxiliary columns to assist the combined state of both columns. A pair of left and right shinkai pillars are the main constituent elements, and each of the stanchions, auxiliary pillars and shinkai pillars has a large, medium and small cross section in the shape of "U". Is configured so that it can be housed in a column, and is movable in the vertical direction via an engagement relationship between an engaging piece having a sawtooth groove provided in the column and the groove of the engaging piece. A rectangular frame-shaped locking frame provided at the tip end portion of the auxiliary column, and a flat plate-shaped locking frame that is provided in the column and that is inserted into the frame of the locking frame to prevent the locking frame from coming off. It consists of a guide rail and a spring that pulls the above-mentioned pillars toward the ladder. Anti-tip device ladders being.