JPH0240718Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application and purpose of the invention) This invention relates to a folding stepladder that can be used as a seat in the field of household goods. The purpose of the present invention is to make the rotation opening and closing mechanism relatively simple and mutually related in order to provide a stepladder which is extremely easy to handle and can be operated quickly by allowing the rotation opening and closing operations with the treadle to be performed simultaneously in one motion. .

(Prior art) For example, in the "folding children's chair that doubles as a stepladder" described in Publication of Utility Model Publication No. 55-22912, the rotating operation of the middle and lower steps that also serve as a seat board and the opening and closing operations of both the front and rear supporting legs are performed simultaneously. It has come to be carried out separately, and each of these mechanisms is complex and has no relation to each other.
The disadvantage is that the handling operation is very complicated and there is a high probability of failure in terms of construction and operation.

In addition, in the "folding chair that doubles as a stepladder" described in Utility Model Publication No. 55-21661, the first, second, and third
first and second rotating arms provided for rotating each step stool to a position where it functions as a stepladder, rotating it so that it functions as a chair, and operating the legs to open and close; The rotating mechanisms of the side rods, link levers, etc. require a wide variety of complex mechanisms, and each operation thereof is extremely complicated, resulting in a drawback in that it requires a lot of work and effort in terms of construction and operation.

(Technical problem to be solved) Therefore, there is a demand for a folding stepladder that can be used as a seat and that can be easily operated by eliminating the above-mentioned shortcomings and deficiencies in the conventional technology and in which the supporting legs and the treadle of the stepladder can rotate simultaneously and the operation thereof is extremely simple. This occurred, and in order to solve this problem, the following interlocking mechanism was adopted in the present invention.

(Means for solving the problem) Three steps are installed on a pair of left and right support legs that are pivoted to the top of the front legs so that the upper ends of the rear legs can be opened and closed. The middle and lower treads are pivotally connected to each other by a rotating shaft, and the front and rear ends of the middle and lower treads are pivotally connected to each other by a pair of parallel connecting rods on both sides of the husband. Both treads are configured to interlock in parallel with each other by a parallel link mechanism, and the pivoting portions at both rear ends of the middle tread are coaxially connected to the inner sides of the left and right rear legs. Both ends of the supporting rods of each treadle are pivotably connected to the corresponding positions of the left and right front legs, and both supporting legs can be opened and closed by the combination of the link mechanisms of the parallel connecting rods and each supporting rod. This constitutes an interlocking mechanism between the movement and the simultaneous rotation of both tread plates, and the above-mentioned interlocking mechanism is configured so that the opening/closing operation of the support leg can be performed simultaneously with the rotation operation of both tread plates.

(Embodiment of the invention) The embodiment will be explained with reference to the accompanying drawings. FIG. 1 shows the functional state as a stepladder, and FIG. 2 is a perspective view of the husband and husband showing the functional state as a stool. A pair of left and right supporting legs are provided on the upper part, with the upper ends of the hind legs 2 pivoted by a hinge plate 3 and a shaft 4 so that both legs can be opened and closed. Both rear ends of an upper tread plate 6 are pivotally connected to the rear end of the attached support base plate 5 by means of a rotary shaft 7 so as to be able to rotate freely, and the front ends of the upper tread plate and the support base plate correspond to positions. A pair of male and female gripping tools 8, 8' are built-in and attached, and when the upper step board is laid down on the support base plate, the gripping tools join and lock the two to prevent the step board from separating upward.

The left and right supporting legs are connected to each other by horizontal beams 9, 9' installed between the left and right legs at the lower portions of the front and rear legs.

The middle step tread 10 has its both rear ends pivotally connected to the upper part of the rear leg 2 by a shaft 11 so as to be able to rotate up and down, and the upper end of the rear connecting rod 12 is coaxially connected at the pivot joint part, and the side plate on the front side thereof The upper end of a front connecting rod 13 is pivotally connected to the front end portion by a shaft 14, and both the front and rear connecting rods are suspended parallel to each other.

The front and rear ends of both sides of the lower step board 15 are pivotally connected to the lower ends of the front and rear connecting rods 12 and 13 by shafts 16 and 17, and the middle and lower step boards are connected by a link mechanism of the front and rear parallel rods. They are configured to rotate in parallel and move up and down together.

Further, a support rod 18 for each step plate is installed between the intermediate portions of each side end of the step boards 10, 15 and corresponding positions on the inside of the left and right front legs, and both ends of the support rod 18 are rotatably pivoted by shafts 19, 20. As both treads rotate, this support rod interlocks and rotates to restrain the front leg, and when both treads are in a horizontal position, it is parallel to the side edges of the two treads, and a horizontal piece 18a provided at the front end rotates. It supports the bottom of the tread.

(Function) The function of the present invention will be explained using FIGS. 3, 4, and 5, as well as FIGS. 1 and 2.

FIG. 3 is an explanatory side view of the posture when used as a stepladder, in which the upper step tread 6 is supported by the support base plate 5 and lies down horizontally on the upper end of the front leg of the supporting legs with the legs spread, and the middle step tread is placed at the lower part. 10 is supported at its rear end on the upper part of the rear leg via a shaft 11, and its front end is supported by a horizontal piece 18a of a support rod 18 to maintain a horizontal position, and further below that, a lower step board 15 is attached to both the front and rear legs. It is supported by the rods 12, 13 and the support rod 18 to maintain a horizontal position, and the upper, middle, and lower steps form a three-step stepladder to maintain a usable state.

However, when folding the stepladder when not in use,
As shown in the figure, when the front end of the middle step tread is pulled up in the direction of the arrow, both the middle and lower step treads will rotate upward while maintaining their parallel positions due to the link mechanism of the front and rear parallel connecting rods 12 and 13. As the robot shifts to the standing position, the link mechanisms of the respective support rods 18 restrain and rotate both treadboards relative to the front legs, and the rear end pivot portion of the middle treadle pulls the back legs toward the front legs. Finally, as shown in Figure 5, both treads, front and rear parallel connecting rods, and each support rod are oriented upwards, narrowing the distance between each other, and the hind legs are in contact with the rear of the front legs, and the entire stepladder is Folds and contracts.

In addition, when opening this during use, by pulling down the middle step board in the opposite direction to the previous time, the state changes from the state shown in FIG. 4 to the state shown in FIG. 3, and is ready for use.

Furthermore, when this stepladder is used as a seat, the front end of the upper step board 6 is rotated rearward about the pull-up shaft 7 in the functional position as a stepladder shown in FIG. When the tread is placed in a standing position at the rear, the tread serves as a backrest, and the user sits on the middle tread and leans his back against the back of the upper tread;
The stepladder can be used as a seat by placing your feet on the lower tread or on the floor.

(Effect of the invention) In the present invention, the interlocking mechanism between the supporting legs and the tread plate is constructed by the combination of the front and rear parallel connecting rods provided on both sides of the middle tread plate and the lower tread plate, and the link mechanism of each tread support rod. When in use, by rotating the middle tread upward or downward, the lower tread and the supporting legs are rotated to open and close together, making the handling operation very simple and quick. Furthermore, when in the position of a stepladder, it can be used as a seat by rotating only the upper tread to the rear and standing up, so switching between the functions of a stepladder and a seat is extremely efficient, and the use can be quickly changed at any time. can.

In addition, when the chair is used as a seat, the legs can be alternately placed on the lower step board and on the floor to reduce fatigue of the human legs.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the functional state of the folding stepladder that can be used as a seat according to the present invention as a stepladder, and Fig. 2 is a perspective view showing the functional state of the stepladder as a seat.
FIG. 3 to FIG. 4 are explanatory side views of the stepladder in each position, illustrating the folded open/closed state.
Figure 3 shows the legs in the open position, Figure 4 shows them in the middle of opening and closing, and Figure 5 shows them in the folded position. 1...Front leg, 2...Back leg, 6...Upper step board, 1
0...middle step board, 12...rear continuous lever, 13...front continuous lever, 11, 14, 16, 17, 19, 20...
...Shaft, 15...Lower tread, 18...Support rod.

Claims (1)

[Scope of utility model registration request] In a folding stepladder, treads are installed in three tiers on a pair of left and right support legs, which are pivoted to the upper ends of the front legs so that they can be opened and closed. The rear ends of both sides of the middle step board 10 are pivotally connected to the upper part of the rear leg, and the front and rear parallel connecting rods are pivotally connected to the pivot joint and the front end of the side part of the step board on the front side thereof. The front and rear ends of both sides of the lower step board 15 are pivotally connected to the lower ends of 12 and 13, and both ends of the husband step board support rod 18 are pivotally connected to the both sides of the middle and lower step boards and the corresponding positions of the left and right front legs. A folding stepladder that can also be used as a seat, in which a linkage mechanism between the two parallel connecting rods and each of the treadle supporting rods constitutes an interlocking mechanism between the supporting leg and both treadles.