JPH1061356A - Support device for stepladder and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support device that is simple structurally, is easy to handle, and is high in safety during use. SOLUTION: This device includes right and left supports 1, a plurality of rungs 2 ... placed between the supports 1, curved legs 7 placed at the bottoms of the supports 1, leg guides provided at the lower ends of the supports to guide the curved legs 7, and a leg adjuster 10 provided approximately in the center position of the lowest rung 2. The leg adjuster 10 has a fixed frame 12 attached to the lower surface of the rung 2, the fixed frame 12 has a pair of connectors 14, 14 each freely rotationally attached thereto via one end, and a control lever 16 is freely rotationally attached 15 to the other end of each connector 14 at its middle part. A clamp 18 constructed of an elastic plate with an inverted-V-shaped side with a curved part formed at each end is freely rotationally attached 17 to one end of the control lever 16 at one of its curved parts, the other curved part is attached 21 to the fixed frame, and the curved leg 7 is supported by the clamp 18 in such a way that its position is freely adjustable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for a ladder, a stepladder, and a ladder dual-purpose stepladder used on a slope, a stair, or the like.

[0002]

2. Description of the Related Art Conventionally, various inventions have been made to stably stand a stepladder upright on an installation surface on which a stepladder is not flat, for example, on a staircase or an inclined surface. The prior application technology is disclosed in, for example, Japanese Patent Publication No. 63-64593,
No. 61159, Japanese Utility Model Publication No. 4-30315 and the like.

In the prior application described in Japanese Patent Publication No. 63-64593, one end of a link is pivotally attached to the lower end of a leg and the link is turned when lifted or fixed with a cam surface when lowered. Thus, the arc leg is moved so that it can be used even on a slope. However, while this prior art technology makes it easy to adjust the arc legs, the stability of the arc legs during use depends on the weight of the person using the stepladder, so that the stability when a person gets on and off is not necessarily sufficient. There was a problem that was not.

[0004] The prior application described in Japanese Patent Publication No. 1-61159 has a feature that the arc-shaped legs are adjusted so that the legs can be used on a sloped ground, and can be used for stepladders of various sizes. Although it is versatile, there are problems that many members are required, the structure becomes complicated, and the weight increases. In the prior application described in Japanese Utility Model Publication No. 4-30315, an arcuate sheath tube is used to attach to ladders of different sizes, but there is a problem that handling becomes complicated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and has a simple structure, is easy to handle, and has a high stability during use. To provide a supporting device.

[0006]

According to another aspect of the present invention, there is provided a supporting device for a stepladder or the like, comprising: a left and right column, a plurality of steps provided between the columns, and a lower portion of the columns. A curved leg with a curved shape arranged in the, a leg guide for guiding the curved legs provided at the lower ends of both columns, and a leg adjuster provided at a substantially central position of the lowermost tread, comprising a leg adjuster, A fixed frame is attached to the lower surface of the step, and a pair of connecting tools are rotatably mounted on the fixed frame via one end thereof, and an operating lever is rotatable at the other end of the connecting tool at an intermediate portion thereof. A fastening tool, which is formed of a plate having elasticity in the shape of an inverted side and having curved portions formed at both ends thereof, is rotatably mounted at one of the curved portions. The other bending portion is mounted on a fixed frame, and the bending leg is supported by the fastening tool so that the position of the bending leg can be adjusted. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. (Overall Configuration) The ladder / stepladder A according to the present invention can be selected in the state of use as a stepladder shown in FIG. 2 and the state of use as a ladder shown in FIG. 3, and the basic configuration is shown in FIG. As described above, the three-step stairs 2 are bridged between the left and right supports 1, 1 and fixed using the rivets 2a. Attach the reinforcing bracket 3 as necessary.

A top plate 4 is provided at the top of the columns 1 and 1. Such a ladder-shaped object formed in the same shape in the front and rear is axially attached by the connecting shaft 4a, and is provided to bend and extend freely,
In order to fix the angle in the open state, an opening stopper 5 is additionally provided. Link-shaped leg guides 6 are attached to the lower ends of the left and right columns 1, 1, and the leg guides 6 support a part of the arc-shaped curved leg 7. A leg cap 8 is rotatably mounted on both ends of the curved leg 7 via a leg shaft 9, and a leg adjuster 10 for supporting the top of the arcuate curved leg 7 is attached to the step rail 2.

(Leg Adjuster 10) The leg adjuster 10 is the basis of the present invention, and adjusts the posture of the curved leg 7 according to the unevenness of the ground contact surface. For example, when the installation surface is a stair as shown in FIG. 4, the curved leg 7 is rotated approximately 45 degrees from the state shown in FIG.

[0010] As shown in FIG.
Since the lower surface of the ladder is also used by inclining the ladder portion of the ladder / ladder A, it is formed to be inclined at a certain angle. Leg adjuster 10
1 will be described with reference to FIGS. A side U-shaped mounting bracket 11 is fixed to the lower surface of the step bar 2 using a rivet 2a, and a fixed frame 12 having at least a part of a side inverted L shape is attached to a lower portion thereof using the rivet 11a. The part other than the above part may be substantially U-shaped in side surface shape that holds the curved leg 7.

The upper ends of rod-like connecting members 14 and 14 having a fixed length are rotatably mounted on the left and right sides of a first shaft 13 provided at one end of the fixed frame 12. An intermediate portion of the operation lever 16 is rotatably mounted via the second shaft 15. The portion of the operation lever 16 where the second shaft 15 is provided is formed in a U-shaped cross section, the grip portion 16a is formed in a flat plate shape, and one end of the end on the U-shaped cross section is provided with a third shaft. 1
A fastening tool 18 having an inverted V-shape is mounted on the shaft 7 via a rotatable shaft 7.

As shown in FIG. 8, the fastener 18 is a plate having a fixed width on the left and right sides and is made of an elastic material, for example, a metal material such as steel. Both ends of the fastener 18 are hooked curved portions 18.
a, 18b are formed, and one of the curved portions 18a is
7 and the other curved portion 18b is locked to the fourth shaft 21 provided at the lower end of the fixed frame 12. The fastener 18 supports and fixes a rack 19 disposed below the curved leg 7 described below from below. In other words, the curved leg 7 is fixed to the fixed frame 12 and the fastener 18.
Thus, it is supported and fixed from the surroundings via the rack 19.

The curved leg 7 is formed in a circular arc shape and its cross section in the radial direction is formed in a square pipe shape. A rack 19 is attached to the lower surface of the curved leg 7 over a predetermined length, for example, between the two leg guides 6. A plurality of rivets 20 are provided on the lower surface of the rack 19.
Are attached at regular intervals. Therefore, when the posture of the curved leg 7 is changed from the state shown in FIGS. 1 and 7 (A), the clamp 18 is loosened by rotating the grip 16a of the operation lever 16 clockwise. Further, when the connecting tools 14 and 14 are further rotated clockwise while rotating about the first shaft 13, the fastening tool 18 is moved downward and FIG.
The position becomes the position (B), and the curved leg 7 becomes movable.

In this case, the rack 19 is moved together with the curved leg 7, and when the curved leg 7 is in a proper posture, the operation lever 16 is rotated counterclockwise this time to move it to the position shown by the solid line in FIG. At this point, the curved leg 7 is fixed by the fastener 18. In the present embodiment, not only is the fixing and movement of the curved leg 7 free by simply rotating the operation lever 16, but also
Since the connecting members 14 and 14 are elastically supported counterclockwise around the first shaft 13 through the operating lever 16 by the elastic force of 8, that is, the elasticity as a plate spring, the curved leg 7 is firmly supported.

In order to maintain such an effect, in particular, as shown in FIG. 7A, when the curved leg 7 is fixed, the position of the third shaft 17 is changed to the first shaft 13 and the third shaft 17. Must be to the left of the line connecting. In this state, the fastener 18 is pressed against the curved leg 7 by the elastic force of the fastener 18.

When the operating lever 16 is rotated clockwise in such an operating state as shown in FIG. 7 (B), there is a little resistance due to the spring pressure of the fastener 18 at the beginning of rotation. When the shaft 17 comes to the right of the line connecting the first shaft 13 and the second shaft 15, the operation lever 16 can rotate lightly. In this state, the fixing of the curved leg 7 is released and the position adjustment is easy, and at the same time, the operation lever 1 is
On the contrary, when the clamp 6 is rotated counterclockwise and presses the fastener 18 against the curved leg 7, the curved leg 7 can be reliably held by the elastic force of the clamp 18. Such posture adjustment of the curved leg 7 is effective both when used as a stepladder or when used as a ladder.

[0017]

Since the present invention is constructed as described above, the structure is simple and easy to handle, and the holding of the curved legs is reliable and the safety is high. Moreover, the adjusting device can be attached to an existing stepladder or ladder, and is highly versatile.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the ladder / stepladder according to the present invention is used as a stepladder.

FIG. 3 is an exemplary perspective view showing a use state as a ladder of the embodiment.

FIG. 4 is an exemplary front view showing a use state as a stepladder on the stairs according to the embodiment;

FIG. 5 is an explanatory side view of a main part of the embodiment.

FIG. 6 is a front view of the leg adjuster of the embodiment.

FIGS. 7A and 7B are explanatory diagrams of the operation of the leg adjuster of the embodiment, in which FIG. 7A shows a fixed state of the curved leg, and FIG. 7B shows a fixed state of the curved leg.

FIG. 8 is a perspective view of the fastener of the embodiment.

[Explanation of symbols]

 A: Ladder combined stepladder 1 ... Prop 2 ... Stepping bar 2 a ... Rivets 3 ... Reinforcement bracket 4 ... Top plate 4 a ... Connecting shaft 5 ... Opening stopper bracket 6 ・..Leg guide 7 ・ ・ ・ Bent leg 8 ・ ・ ・ Leg cap 9 ・ ・ ・ Leg shaft 10 ・ ・ ・ Leg adjuster 11 ・ ・ ・ Mounting bracket 11a ・ ・ ・ Rivet 12 ・ ・ ・ Fixed frame 13 ・··· First shaft 14 ··· Connecting device 15 ··· Second shaft 16 ··· Operation lever 16a ··· Grip part 17 ······· Third shaft 18 ··· Fastener 18a ··· (Operation Curved portion 18b (on the lever side) Curved portion (on the fixed frame side) 19 Rack 20 Rivet 21 Fourth axis

Claims (1)

[Claims] 1. Left and right columns, a plurality of steps provided between the columns, and curved legs having a curved shape disposed below the columns.
It has a leg guide provided at the lower ends of both struts for guiding curved legs, and a leg adjuster provided substantially at the center of the lowermost tread, and the leg adjuster has a fixed frame attached to the lower surface of the tread. A pair of connecting tools are rotatably mounted on the fixed frame via one end thereof, and an operating lever is rotatably mounted on the other end of the connecting tool at an intermediate portion thereof, and one end of the operating lever is provided. Then, a fastening tool composed of a plate having elasticity in the shape of an inverted side and having curved portions formed at both ends thereof is rotatably mounted on one of the curved portions, and the other curved portion is mounted on the fixed frame. A supporting device for a stepladder or the like, wherein the bending leg is supported by the fastening tool so that the position of the curved leg can be adjusted.