JPS6236951Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a stepladder made of pipe.

Conventionally, pipe stepladders used in various construction works, etc., have top plates 5 and 6 fixed by welding to the upper ends of a pair of left and right pipe legs 1 and 2, as shown in Fig. 1.
The pipe legs 1 and 2 are foldably supported with their support shafts 9 as fulcrums, and a plurality of steps 3 and 4 are installed horizontally on the pipe legs 1 and 2 and fixed by welding. A left rod 14 and a right rod 15 are pivotally mounted on the upper support pieces 12 and 13 with support shafts 16 and 17, and the left rod 1
4 and the right rod 15 are supported so that they can be folded in half using the support shaft 18 as a fulcrum.

Therefore, when the stepladder is folded and closed, the two-fold support shafts 18 of the left and right rods 14 and 15 are pulled upward, and the support shafts 9 of the pair of left and right pipe legs 1 and 2 are used as fulcrums, as shown in Fig. 1. It can only be folded to the extent shown by the line, but it is folded in a bulkier state than necessary, and the bulkiness of many stepladders is significant when transporting or storing them, and the need for a thinner and more compact stepladder is lacking. It was hot.

In view of the above points, the present invention was devised to make the pipe stepladder as thin and compact as possible when the legs are folded and closed, without impairing the original function of the stepladder.

An embodiment of the present invention will be described with reference to the accompanying drawings starting from FIG. It consists of hind legs 1b and 2b.

Reference numerals 3 and 4 refer to tread plates having an inverted U-shaped cross section and fixed by welding between the front legs 1a and 2a and the rear legs 1b and 2b, and are arranged at positions that approximately divide the pipe legs 1 and 2 into four vertically. There is. Reference numerals 5 and 6 denote a pair of left and right top plates, on which the upper ends of the pipe legs 1 and 2 are welded and fixed to both front and rear sides on the inner side of the back side.

Reference numeral 7 denotes a support plate whose right base end is welded and fixed to both the front and back sides of the back surface of the right top plate 6 and the upper end of the right pipe leg 2, and which extends toward both the front and back sides of the left side of the left top plate 5; is a support plate formed on both the front and rear sides of the left side of the left top plate 5 by welding the right base end of the back side of the left top plate 5 to the upper end of the left pipe leg 1. The support plates 7 and 8 are arranged side by side on both front and rear sides of the back surface of the left top plate 5 in an overlapping state.

9 is a support shaft of the pipe legs 1 and 2, such as a bolt, nut or shaft pin, and is arranged at a position offset to the left end of the overlapping support plates 7 and 8, that is, at a position outside the left pipe leg 1. At the same time, a pipe is attached to a support plate 8 located on both front and rear sides of the left top plate 5, and a left tip of a support plate 7 extending from both front and rear sides of the right top plate 6 to an outer position of the pipe leg 1. The support shafts 9 of the legs 1 and 2 are inserted through the legs 1 and 2 so that they can be folded freely.

Numerals 10 and 11 are projecting pieces fixed to the front and rear ends of the top plates 5 and 6 in an inverted U-shape, and are used for work scaffolding boards to be constructed on the top plates 5 and 6 of adjacent pipe stepladders. Prevent back and forth movement.

Reference numerals 12 and 13 refer to support pieces protruding from both front and rear sides of the upper surface of the tread plates 3 and 4 in the center, and reference numerals 14 and 15 refer to a pair of left and right continuous rods forming a link between the left and right support pieces 12 and 13; , bolt the left side of the left rod 14.
The right side of the right rod 15 is pivoted to the support piece 12 by a support shaft 16 such as a pin, and the right side of the right rod 15 is similarly connected to the support piece 13 by a support shaft 17. The left side is connected by a support shaft 18 so that it can be folded in half. Reference numeral 19 is a stopper protrusion bent on the right side of the left rod 14, and functions as an opening stopper against which the upper left side of the right rod 15 stops. 20 is a cap fitted onto the lower end of the pipe legs 1 and 2.

When folding the stepladder according to the present invention which is in an open state as shown in FIG. 2, the pair of left and right connecting rods 14, 15 upward, fold it in half, and pull one of the pipe legs 1 and 2 toward the other pipe leg 1 and 2.

Then, the left and right pair of pipe legs 1 and 2 are folded into a substantially parallel state as shown in FIG. 4, using the support shaft 9 located on the outside of one pipe leg 1 as a fulcrum.

Further, the connecting rods 14 and 15 are folded upward and stored in two without being exposed between the parallel pipe legs 1 and 2.

In the present invention, as described above, the top plates 5 and 6 are fixed to the upper parts of the left and right pair of pipe legs 1 and 2, and the pipe legs 1 and 2 are supported foldably about the support shafts 9, and the pipe legs 1 and 2 are foldably supported. In a pipe stepladder in which a plurality of steps 3, 4 are fixed to the legs 1, 2, and a pair of left and right connecting rods 14, 15 are linked between the left and right steps 3, 4, the pipe legs 1, 2 are fixed. A pipe stepladder in which the support shaft 9 is arranged on the outside of one of the pipe legs 1, and the pipe legs 1 and 2 are folded into a substantially parallel state when the pipe legs 1 and 2 are closed. Therefore, without compromising the original function and form of this kind of pipe stepladder, when the stepladder's legs are closed, the positions of the left and right treads will shift and the steps will be different.
Since the left and right pipe legs can be folded into a nearly parallel state, each stepladder can be made thinner and more compact, dramatically improving the transportation efficiency and storage efficiency of this type of stepladder. Various practical effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional example of a pipe stepladder, Fig. 2 is a longitudinal sectional front view of the pipe stepladder according to the present invention, Fig. 3 is a right side view thereof, and Fig. 4 is a longitudinal sectional view showing a folded state. 5 is an enlarged view of the top plate portion, and FIG. 6 is an enlarged view of the tread plate portion. Code list, 1, 2... Pipe leg, 3, 4... Step board, 5, 6... Top plate, 7, 8... Support plate, 9...
Pipe leg support shaft, 10, 11... protrusion, 12, 1
3... Support piece, 14, 15... Continuous rod, 16, 1
7, 18...Spindle of the connecting rod, 19...Protruding piece for the stopper, 20...Cap.

Claims (1)

[Scope of claims for utility model registration] (1) A top plate 5,
6 is fixed, and the pipe legs 1 and 2 are attached to their support shafts 9.
A plurality of steps 3 and 4 are fixed to the pipe legs 1 and 2, and a pair of left and right connecting rods 1 are fixed between the left and right step boards 3 and 4.
In the pipe stepladder in which the pipe legs 1 and 15 are linked, the support shafts 9 of the pipe legs 1 and 2 are arranged on the outside of one of the pipe legs 1, and the pipe legs 1 and 2 are connected to each other.
A pipe stepladder characterized in that the pipe legs 1 and 2 are folded into a substantially parallel state when the legs are closed. (2) In the pipe stepladder described in claim 1 of the utility model registration claim, the support shafts 9 of the pipe legs 1 and 2
, support plates 8 located on both front and rear sides of one top plate 5, and support plates 7 extending from both front and rear sides of the other top plate 6 to an outer position of the pipe leg 1.
A stepladder made of pipe that is penetrated and supported. (3) In the pipe stepladder according to claim 1 or 2 of the utility model registration claim, of the pair of left and right top plates 5 and 6, the front and rear sides of the back of the right top plate 6 and the pipe legs 2 thereof A support plate 7 is provided with a base end fixed to the upper end and a distal end thereof extended toward the left top plate 5, and a support plate 8 installed in parallel with the support plate 7.
are fixed to both front and back sides of the back of the left top plate 5 and the upper end of the pipe leg 1, and supports for the pipe legs 1 and 2 are fixed to the tips of the support plates 7 and 8 located outside of the pipe leg 1. A stepladder made of pipe with a shaft 9 inserted and supported.