JPH0420692A - Auxiliary leg of ladder - Google Patents

Abstract

PURPOSE:To stabilize a ladder by mounting a bearing leg projecting forward with a specific angle to a fixed member provided with a C-shaped sectional form, fitted outward of a required position of a bearing column and capable of moving up and down, and driving a wedge between the fixed member and bearing column. CONSTITUTION:An auxiliary leg is constituted of a fixed member 1, wedge 2 and bearing leg 3 projecting forward with approximate 15 deg.-30 deg., and the fixed member 1 is fitted in an appropriate position of the lower part of a bearing column 4 having the lower foundation of a place against which a ladder is stood, and the auxiliary leg is pushed down while keeping the ladder in a stabilized state. After that, when the lower end of the bearing leg 3 of the auxiliary leg reaches the foundation, a wedge 2 is driven between the fixed member 1 and bearing column 4 to fix the fixed member 1 to the bearing column 4. The ladder is kept in a stabilized state. According to the constitution, the auxiliary leg is moved to a required position along the bearing column 4, and it is fixed at any position, so that the apparent length of the ladder can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an auxiliary leg that is attached to a support column of a ladder and whose apparent length is adjusted.

(Prior Art) Ladders are used when climbing up and down high places such as roofs, trees, and utility poles.

A ladder has horizontal rungs arranged at regular intervals between a pair of left and right support columns, and is used by leaning against the eaves of a roof.5 <Problems to be Solved by the Invention> ) Normally, the width of a ladder (length of the horizontal rung) is 30 to 5 t) c + n
It is long and narrow, with a height (length of the support column) of 2 meters to several meters, and as mentioned above, it is used by leaning over the eaves of a roof.

Therefore, when using a ladder, it is important that the ground is flat and that the left and right support columns are supported by bases of the same height. However, in reality, ladders are often used on uneven locations, so they slope laterally depending on the height difference of the base at that location. This is dangerous, and there is also the problem that ladders cannot be used when there is a large difference in height.

The present invention was made to solve these problems, and its purpose is to adjust the apparent upper length of the leg of one support column to correspond to the difference in height of the base. To provide auxiliary legs that can always keep a ladder in a stable state.

(Means for Solving the Problems) The auxiliary legs of the ladder according to the present invention have a cross-sectional shape, and can be externally fitted at a desired location on the support column, and can be fitted up and down along the support column. The support legs are placed on a fixed member that can be moved forward by about 15 to 30 degrees, and the fixed member is fixed to the support column with a wedge, so that the appearance of the support column of the ladder is A means is adopted which is characterized in that the length can be adjusted.

(Function) The auxiliary leg of the ladder according to the present invention has a fixed member with a cross-sectional shape of C.
It can be shaped into a shape and fitted onto the outside of the support column at a desired location, it can be moved up and down along the support column, and it can be fixed at any position on the support column using a wedge. Furthermore, by attaching the supporting legs to the fixed member with the support legs projecting forward by approximately 15 to 30 degrees, the apparent length of the support pillars of the ladder can be adjusted. This allows the ladder to remain stable even on uneven spots on the base.

In addition, since the supporting legs are attached with a 15 to 30 degree extension toward the front, when weight is added to the ladder, a force is applied to the supporting legs that tends to rotate in the direction f around the lower end of the supporting legs. .

Therefore, due to this force, the upper edge of the front surface of the fixing member is pressed against the wedge, and the lower edge of the rear surface is pressed against the support column of the ladder. As a result, the support column will be sandwiched between the fixed members, so
Even if the wedge is driven in somewhat loosely, the fixing member will be securely fixed to the support column.

(Example) Hereinafter, the auxiliary leg of a ladder according to the present invention will be specifically explained based on the illustrated example.

In this embodiment, the auxiliary legs are fixed members 1 and 2, and supporting legs 3.
It consists of.

The fixing member 1 is made of a silver material having appropriate strength, such as iron plate, and is formed into a rectangular tube shape that is slightly larger than the supporting column 4 of the ladder.

In particular, the fixing member 1 has a C-shaped cross section with one side 11 cut out, and the gap between the cutout parts is wider than the width of the support pillar 4 of the ladder. can be externally fitted onto the support column 4 at a desired location, and can also be moved up and down along the support column 4.

In addition, the distance between the front and rear surfaces 12 and I3 of the fixed member 1 is narrower than the length of the front and back width B of the support column 4 of the ladder plus the thickness of the proximal end of PA2, and the width of the support column 4 plus the tip of F2. It is formed wider than the length plus the thickness, and when it is fitted onto the support column 4, a gap is created between the front surface 12 of the support column 4 and the front surface 42 of the support column 4 into which the wedge 2 can be inserted. The fixing member 1 is fixed to the support column 4 by driving a wedge 2 into this gap.

The supporting leg 3 functions in place of the lower end of the supporting column 4 by fixing the fixing member 1 to the supporting column 4 and attaching the auxiliary leg to the supporting column 4.
It is attached to the fixing member 1 with a protrusion of about 30 degrees.

When using this auxiliary leg, the fixing member 1 is fitted into an appropriate position at the bottom of the lower support column 4 of the base where the ladder is to be propped up, and the auxiliary leg is pushed down while keeping the ladder in a stable state.

Then, when the lower end of the support leg 3 of the auxiliary leg reaches the base, the FA2 is driven into the gap between the fixing member 1 and the support column 4 to fix the fixation member to the support column 4.

Then, the supporting leg 3 functions as the lower end of the ladder, and the ladder is maintained in a stable state.

(Effects of the Invention) As detailed above, the auxiliary legs of the ladder according to the present invention are used by being fitted into the support columns of the ladder, and can be moved to any desired position along the support columns. By fixing it in position, the apparent length of the ladder can be adjusted.

Therefore, by adjusting the ladder according to the height of the base where the ladder is propped up, the ladder can be used even in places where the base is not flat, and safety during use can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the auxiliary leg of a ladder according to the present invention, and FIG. 2 is a side view showing the auxiliary leg attached to the ladder. 1: Fixed member 2: Wedge 3: Support rod 4: Support pestle

Claims (1)

[Claims] An auxiliary leg consisting of a fixing member, a wedge, and a supporting leg, where the fixing member has a ■-shaped cross section, is fitted onto a desired part of a support column, and is moved up and down along the support column. In addition, the distance between the front and rear surfaces is slightly wider than the front and rear width of the support column of the ladder, and by fitting this on the support column, the front surface and the front surface of the support column are connected. A ladder characterized in that the fixing member is fixed to the support column by driving a wedge between them, and the supporting legs are attached to the fixing member with the supporting legs extending forward by about 15 to 30 degrees. auxiliary legs.