JP2507057Y2 - Fall prevention device for stepladder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepping prevention device for a stepladder, and more particularly to a double stepping device for preventing a stepladder from which the upper end of a subject ladder is pivotally foldable. Is.

[0002]

2. Description of the Related Art In the conventional double stepladder, the upper ends of the left and right symmetrical ladders are simply pivoted to be foldable. Then, normally, it is folded in two and a stepladder is formed by leaning back and forth of both ladders, and the stepladder is used to work at a high place. It is also used as one long ladder by extending and fixing both ladders through the pivotal attachment.

However, such a conventional stepladder often falls during work and may cause serious injury to a worker. Therefore, there arises a technical problem to be solved in order to prevent such a stepladder from inadvertently tipping over during the work, and the present invention aims to solve the problem.

[0004]

This invention has been proposed in order to achieve the above-mentioned object, and the upper end portion of the subject ladder is pivotally attached so as to be foldable, and the upper end of one ladder is In a stepladder in which supporting pieces configured to be able to ground the lower ends to both side surfaces of the two parts are pivotally supported , respectively, one end of each of the two hook pieces is provided in the middle of the two supporting pieces. Swings
It is freely pivoted, and the other end of each hook piece is
There is provided an anti-tip device stepladder, characterized in that it is configured to allow the ring to disengageably engaged provided at an intermediate portion of the ladder.

[0005]

[Operation] When the stepladder is folded in two, both bearing pieces are hung down to the middle of each ladder and slightly expanded outward, and the lower end of the ladder is fixed to the ground.
The other end of the two hooks, one end of which is pivotally supported on the support piece, is locked to a ring provided on the facing ladder. In that case, the stepladder is stable due to the attachment of both ladders and the bearing pieces and hook pieces that have been spread slightly outward between these ladders and anchored on the ground, so that the stepladder will not fall unintentionally. Absent.

In addition, it is extended through the pivotal joints of both ladders,
When it is formed like a ladder, the upper end of it is hooked in place and the whole is tilted, and the extended ladder is used to perform work in high places. The hooks are spread to both sides of the ladder and grounded, and the hooks provided on the middle part of the lower ladder facing each other using one of the hook pieces pivotally supported by the hook piece. The tip of the piece is locked and fixed to the ring.
In such a case, it is natural that the ladder does not fall in the front-rear direction, but it does not inadvertently fall because it is supported in the left-right direction by the support piece.

Further, when the stepladder is not used, it can be folded in two and folded, and the supporting piece and the hook piece can be piled up on the side of the ladder.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. For the sake of convenience of description, a configuration which is conventionally known will be described at the same time. In the figure, 1 is a double stepladder, and the stepladder 1 is pivotally attached to the upper ends of the subject ladders 2 and 2 by a hinge-like metal fitting 3 which can be rotated only in one direction. Therefore, the stepladder 1 can also be used as a single ladder by extending it linearly via the metal fitting 3.

Then, the supporting pieces 4 and 4 are pivotally supported on both side surfaces of the upper end portion of one ladder 2 of the stepladder 1. Various means of this pivotal support are conceivable, but in the case of this embodiment, the rings 5, 5 are fixedly mounted on the metal fitting 3, and further other rings 5a, 5a for engaging with the rings 5, 5 are provided. It is fixed to the upper ends of the support pieces 4 and 4 and is swingably supported. Further, the rings 5, 5 are fixed to the intermediate portions of the supporting pieces 4, 4, and the other rings 5a, 5a engaged with the rings 5, 5 are attached to the hook pieces 6, 6, 6, 6 respectively. Is fixed to one end of each of them and pivotably supported. On the other hand, the other ends of the hook pieces 6, 6, 6, 6 are bent downward 6a, 6a, 6a, 6a. Then, the rings 5, which are fixed to the side surfaces of the intermediate portions of the two ladders 2 and 2, are fixed.
The bent portions 6a, 6a, 6a, 6a are inserted into the 5, 5, 5 so that they can be engaged with each other.

Further, slidable core rods 4a, 4a are fitted and inserted under the supporting pieces 4, 4, and the supporting pieces 4, 4 are inserted.
4 is adjusted to an arbitrary height so that it can be fixed with bolts 7, 7, and the lower ends of the core rods 4a, 4a have seat pieces 8, 8 that can be grounded on the ground or floor at any angle. They are attached to stabilize the grounding of the support pieces 4 and 4. Incidentally, reference numerals 9 and 9 in the figure are fixing metal fittings which have been conventionally used.

[0011]

Since the present invention has a construction as described in detail in the above-mentioned one embodiment, the stepladder spreads the subject ladder forward and backward through the pivotal attachment portion of the upper end and grounds the lower end thereof. Of course, it can be used as an ordinary stepladder. At this time, the two support pieces are expanded to the left and right, the lower end portions thereof are grounded, and the hook pieces are engaged with the ring in the middle portion of the ladder. In that case, the stepladder stabilizes the landing due to the front-rear, left-right, and mutual connection by the hook pieces, and prevents accidental tipping.

When both ladders of the stepladder are linearly extended and used as a single ladder, the upper end of the ladder is hooked on a roof or the like at a constant angle, so that it cannot be tilted forward or backward. Absent. At this time, if one end of a rope or the like is fastened to the upper end of the ladder and the rope is used to tie it to an appropriate portion of the roof, it is useful for preventing the forward and backward tilting. Further, if the supporting pieces are expanded to the left and right and the lower end portions thereof are grounded, and the hook pieces on one side are respectively locked to the ladder, the ladder is stably supported in the left and right directions and will not accidentally fall. .

Thus, during work at a high place, the danger that the stepladder or the ladder extended in a straight line may fall and cause a serious accident can be eliminated. It is a device.

[Brief description of drawings]

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

FIG. 2 is a front view when the stepladder is extended.

FIG. 3 is a side view of FIG.

FIG. 4 is a partially cutaway side view showing a pivotally connected portion at an upper end portion of a ladder.

FIG. 5 is a perspective view showing how hook pieces are attached.

[Explanation of symbols]

 1 stepladder 2 ladder 3 metal fittings 4 support piece 4a core rod 5,5a ring 6 hook piece 6a bent part 7 bolt 8 seat piece 9 fixing metal fitting

Claims (1)

(57) [Scope of utility model registration request] 1. An upper end of a symmetrical ladder is pivotally attached so as to be foldable, and a lower end is provided on both side surfaces of the upper end of one ladder.
Pivotally support each support piece that can be grounded
In the stepladder made up of
One end of the two hook pieces is swingably supported,
Furthermore, the other end portion of each hook piece fall prevention device stepladder, characterized in that the ring provided at an intermediate portion of the ladder is configured to allow disengageably engaged.