JPH0161159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a movable base leg for a stepladder that is connected to a stepladder.

[Conventional technology]

Traditionally, stepladders are designed to be used standing upright on level ground, so the length of the four leg bars is the same. Therefore, it is best to install a stepladder in a place with steps such as stairs. There was a drawback that I couldn't do it.

[Problem to be solved by the invention]

The present invention is intended to enable a stepladder to be used in any location, such as on stairs or on a slope, without causing any hindrance to the use of the stepladder. To provide a movable stand leg for a stepladder that can be reliably connected to the ground.

[Means to solve the problem]

The present invention will be described in detail with reference to the accompanying drawings.

Support plates 19 are vertically provided at both left and right ends of the base tube 7, guide pipes 20 are provided at the lower ends of the left and right support plates 19, and a central guide pipe 3 is attached to the center of the lower surface of the base tube 7. The central guide pipe 3 is provided with a fixing device c that prevents the sliding movement of the arcuate leg 1 inserted into the center guide pipe 3, and the arcuate leg 1 is fitted into the central guide pipe 3 and both guide pipes 20 so as to be slidable left and right. The left guide pipe 2 and the right guide pipe 4 are slidably fitted near both ends of the arcuate leg 1, and are connected to the upper parts of the left guide pipe 2 and right guide pipe 4 through the shaft attachment parts 6', respectively. An adjusting device for adjusting the insertion and removal of the auxiliary base cylinder 13 into and out of the base cylinder 7 by fitting the auxiliary base cylinder 13 into and out of the left and right openings 7' of the base cylinder 7 by freely pivoting the pin 6 in a swinging manner. 21 is provided, and these left and right auxiliary base cylinders 13
A movable platform leg for a stepladder consisting of a movable platform leg a for the front leg, which has a mounting ring 14 with a leg bar fixing device 8 through which the leg bar 5 of the stepladder A is inserted, and a movable leg fixture b for the rear leg of the same structure. This is related to.

[Effect]

A stepladder A is attached to the mounting ring 14 attached to the auxiliary base cylinder 13.
Insert the left and right leg rods 5 of the front legs of the
The lower ends of the left and right leg rods 5 are connected to the joint pin 6 by adjusting them by moving the rods 3 in and out of the attachment ring 14.

At this time, the adjustment device 2 is used to insert and remove the auxiliary base cylinder 13.
1 by adjustment, and fixing of the leg bar 5 to the mounting ring 14 is done by a leg bar fixing device 8.

When connecting the leg rod 5 of the front leg of the stepladder A to the movable front leg leg fixture a, the connecting pin 6 can swing freely and the auxiliary base cylinder 13 can be freely pulled out from the base cylinder 7. Stepladders A of any size can be reliably connected.

Similarly, the leg rod 5 of the rear leg of the stepladder A is connected to the movable leg fixture b for the rear leg.

When the present invention is connected to the front and rear leg bars 5 of the stepladder A, and the stepladder A is to be erected on a staircase, for example, the fixing device c is released and the arcuate leg 1 is slid a predetermined length.

When the arcuate leg 1 is slid, the left guide pipe 2 and right guide pipe 4 are slidably fitted to the arcuate leg 1, so as the arcuate leg 1 slides, the left guide pipe 2 and the right guide pipe 4 Without sliding, the connecting pin 6 maintains the angle in which the leg rod 5 is connected.

〔Example〕

FIG. 1 shows a case where the present invention is attached to the front and rear leg bars 5 of a stepladder A, respectively.

The lower ends of the left and right leg rods 5 of the front and rear legs are pivotably connected to the left guide pipe 2 and the right guide pipe 4 via left and right joint pins 6, respectively.

The shaft attachment part 6' in the drawing has a connecting pin 6 that is inserted into the pipe hole of the leg rod 5 upright on the support rod 15.
The lower end of the right guide pipe 4 and the left guide pipe 2
A case is shown in which the mounting protrusion 17 provided on the holder is pivotally connected by a support shaft 18.

Further, the leg bar fixing device 8 in the drawings shows a case where a tightening fixing bolt 8' is employed.

The fixing device c in the drawing has an L-shaped handle 10 hanging down from a presser foot 9 that presses the arcuate leg 1 from below, and a screw part 11 provided at the base of the L-shaped handle 10 is attached to the lower surface of the central guide pipe 3. The case is shown in which the presser foot 9 is pressed against and fixed to the arcuate leg 1 by screwing into the nut 12 and rotating the L-shaped handle 10.

In addition, the adjusting device 21 in the drawing is a tightening bolt 2.
1' is illustrated.

〔Effect of the invention〕

Since the present invention is constructed as described above, the stepladder A is first placed on the movable front leg movable leg fixture a and the rear leg movable leg fixture b of the present invention, and the two are connected through the connecting pin 6. A is a stepladder A with movable legs.

When using this stepladder A with movable legs, for example, on stairs, release the fixing device c, set the arcuate legs 1 in a free state on the stairs, and slide the arcuate legs 1 so that the stepladder A stands upright. If so, even in a place with steps, the stepladder A can be easily installed upright as on a level ground by sliding the front and rear arcuate legs 1.

At this time, the central guide pipe 3 is provided with a fixing device c for the arcuate legs 1, so if you install the stepladder A upright and then fix the arcuate legs 1 with the fixing device c, the stepladder A will no longer wobble unstablely and will stand upright. It will maintain its condition and be erected stably.

In addition, the stepladder A and the movable front leg movable leg fixture a and the rear leg movable leg fixture b are connected by connecting the leg rod 5 and the joint pin 6 from the row through the joint pin 6 provided respectively. Stepladder A can be changed to stepladder A with movable legs by a simple operation.

Furthermore, in the present invention, the connecting pin 6 is pivotally attached to the left and right guide pipes 2 and 4, and the auxiliary base cylinder 13 is provided in and out of the base cylinder 7, so that the stepladder A can be used in any size. It will be installed securely.

In this way, by using the present invention in combination with stepladder A, the stepladder A can always be used even on stairs or on slopes where it was previously impossible to stand the stepladder A upright.
This is a movable base leg for a stepladder that exhibits excellent practicality as it can be stably erected in an upright position.

[Brief explanation of drawings]

Fig. 1 is a front view of the movable base leg for the front leg, Fig. 2 is a sectional view of the fixing device, Fig. 3 is an enlarged perspective view of the main parts,
FIG. 4 is a perspective view of the present invention attached to a stepladder. A... Stepladder, a... Movable platform leg for front leg, b...
Movable base leg fixture for rear legs, c... Fixing device, 1... Arc leg, 2... Left guide pipe, 3... Center guide pipe, 4... Right guide pipe, 5... Leg bar, 6...
...Joint pin, 6'...Shaft attachment part, 7...Base cylinder, 7'...
...Opening part, 8...Leg bar fixing device, 13...Auxiliary base cylinder, 14...Mounting ring, 19...Support plate, 20...
Guide pipe, 21...adjustment device.

Claims (1)

[Claims] 1. Support plates 19 are vertically provided at both left and right ends of the base tube 7, guide pipes 20 are provided at the lower ends of the left and right support plates 19, and a central guide pipe 3 is attached to the center of the lower surface of the base tube 7, The central guide pipe 3 is provided with a fixing device c that prevents the arcuate leg 1 inserted into the center guide pipe 3 from sliding, and the arcuate leg 1 can be slid left and right between the central guide pipe 3 and both guide pipes 20. The left guide pipe 2 and the right guide pipe 4 are slidably fitted near both ends of the arcuate leg 1, and the left guide pipe 2 and the right guide pipe 4 are connected to the upper part of the left guide pipe 2 and the right guide pipe 4 through the shaft attachment portions 6', respectively. An adjustment device for adjusting the insertion and removal of the auxiliary base cylinder 13 into and out of the base cylinder 7 by pivoting the dowel pin 6 so that it can freely swing and fitting the auxiliary base cylinder 13 into and out of the left and right openings 7' of the base cylinder 7. 21 is provided, and these left and right auxiliary base cylinders 13
A movable platform leg for a stepladder consisting of a movable platform leg a for the front leg, which has a mounting ring 14 with a leg bar fixing device 8 through which the leg bar 5 of the stepladder A is inserted, and a movable leg fixture b for the rear leg of the same structure. .