JPH0651498U - Tripod stepladder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tripod stepladder that is more slippery. [Structure] The tread 8 is formed by connecting both ends of a horizontal tread plate 10 to both ends of a semi-cylindrical member 9 protruding downward. A plurality of ridges 12, 12A are arranged on the upper surface of the footboard 10. The ridges 12 and 12A are provided in directions intersecting with each other. [Effect] You can move up and down with good stability. Even if the footboard 10 is wet, the foot does not slip and can be safely moved up and down.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tripod stepladder used for gardening, landscaping, etc.

[0002]

[Prior art]

 Conventionally, as this type, Japanese Utility Model Publication No. 4-46080 discloses one or a plurality of grooves in which a plurality of ridges are provided in the central portion at substantially equal intervals in the longitudinal direction of the outer peripheral surface. The length of the outer peripheral surface, which has an underframe to which a central tube consisting of a book tube is attached, and a shape in which the upper end is attached to the front rod of the above-mentioned rod and is curved and spreads laterally as it goes downward. Direction, a pair of left and right leg pipes each having a groove formed between a large number of ridges provided at substantially equal intervals, and a tread attached at a distance between the leg pipes and the reinforcing pipe. It consists of a ladder consisting of pipes and a support pipe with the upper end rotatably attached to the rear pipe of the underframe and the upper part of which is provided with a handle / working footrest. The formed pipes form a pair of left and right leg pipes and a central pipe of the underframe to support the body by grasping and scaffolding. Sankyakuashi elevational capable of performing safe work without slipping when there is disclosed.

[0003]

[Problems to be solved by the device]

 In the above-mentioned prior art, since the pair of left and right leg pipes and the central pipe of the underframe are formed by the pipe in which the groove is formed between the plurality of axially extending projections, the projections and grooves are It is more slippery than the one without. However, since the ridges and grooves are in the axial direction, there is a problem that they are slippery when clay-like soil or rain adheres.

Therefore, the object of the present invention is to provide a tripod stepladder in which the pedestal is even more slippery.

[0005]

[Means for Solving the Problems]

 The present invention provides a pair of left and right leg tubes having a shape that widens downward, a multi-staged tread tube with a space between the left and right leg tubes, and an upper portion of the left and right leg tubes. In a tripod stepladder equipped with a support rod whose upper end is rotatably connected, the above-mentioned tread tube has both ends of a horizontal tread plate connected to both ends of a semi-cylindrical member projecting downward, and the upper surface of the tread plate is A plurality of ridges are provided, and the ridges are tripod steps provided in directions intersecting with each other.

[0006]

[Action]

 With the above configuration, when the foot is placed on the footboard, the footboard is horizontal and thus less likely to slip, and further, the ridges provided on the top surface of the footboard further prevent slippage.

[0007]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes an underframe, and this underframe 1 has one or two central tubes 3 connected to the inside of a frame tube 2 formed in a U shape. The frame tube 2 and the central tube 3 are made of an aluminum tube having a hollow circular cross section. Reference numeral 4 denotes a pair of left and right leg pipes. The leg pipe 4 has a shape that widens to both sides as it goes downward, and is formed by an aluminum pipe having a hollow circular cross section. An upper end of the leg pipe 4 is connected to an end portion provided on one side of the frame pipe 2, and a grounding member 5 having an L-shaped cross section is fixed to a lower end of the leg pipe 4. Reference numeral 6 is a reinforcing pipe provided along the leg pipe 4, and its upper end is connected to the corner portion on the other side of the frame pipe 2. The reinforcing pipe 6 is formed of an aluminum pipe having a hollow circular cross section and a ridge 7 formed on the outer peripheral surface in the axial direction.

Reference numeral 8 is a stepping pipe connected between the pair of left and right leg pipes 4 and arranged in multiple stages. This tread tube 8 is composed of a semi-cylindrical member 9 and a tread plate 10. The semi-cylindrical member 9 is a half-divided aluminum tube, the opening 11 side of which faces upward, and the central portion of which projects downward. The footboard 10 made of an aluminum plate is horizontally arranged in the opening 11, and both ends of the footboard 10 are fixed by welding or the like to be continuously connected to the semi-cylindrical member 9 to form a tubular shape. There is. Further, a plurality of ridges 12, 12A are provided on the upper surface of the step board 10. The ridges 12 and 12A are arranged integrally with the step plate 10 so that their directions intersect at 90 degrees. Further, a projection 13 having a circular plane is provided integrally with the step board 10 between the protrusions 12 and 12A. Reference numeral 14 denotes a tread frame pipe which is attached between the leg pipe 4 and the reinforcing pipe 6 with a space therebetween, and the tread frame pipe 14 is formed of an aluminum pipe having a hollow circular cross section. Reference numeral 15 is a vertical pipe that connects the foot pipe 8 and the foot frame pipe 14 on the lower side.

Reference numeral 16 denotes a support tube whose upper end is rotatably attached to the other side tube portion 17 of the frame tube 2. This support tube 16 has a projection 18 formed on the outer peripheral surface in the axial direction and has a cross section. Is formed by a hollow circular aluminum tube. A handle / working footrest 19 is provided on the upper portion of the support tube 16, and a grounding member 20 having an L-shaped cross section is fixedly attached to the lower end thereof. An outer pipe 21 is rotatably fitted on the other side pipe portion 17, and the upper end of the support pipe 16 is connected to the outer pipe 21.

Next, the operation of the above configuration will be described. At the time of use, the leg tube 4 and the support tube 16 are opened and grounded. In this state, the foot 8 and the foot frame tube 14 are placed on the underframe 1 for work. Even when the tread tube 8 and the tread frame tube 14 are wet with water when climbing up to the underframe 1, the ridges 12, 12A and the projection 13 prevent the tread tube 12 and the tread frame tube 14 from slipping. Further, since the tread plate 10 of the tread tube 8 is provided in a horizontal plane, it can be moved up and down with good stability, and the ridges 12 and 12A of the tread plate 10 are arranged so as to intersect with each other. , It always acts so that the foot does not slip, and it can safely go up and down.

As described above, in the above embodiment, the tread tube 8 can be stably moved up and down by connecting both ends of the horizontal tread plate 10 to both ends of the semi-cylindrical member 9 protruding downward. Further, a plurality of ridges 12 and 12A are arranged on the upper surface of the tread 10, and the ridges 12 and 12A are provided in a direction intersecting with each other, so that the tread 10 is wet with clay-like soil and water. Even if you are wearing it, you can safely move up and down without slipping your legs.

FIGS. 3 and 4 show a second embodiment and a third embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. . In the second embodiment, the foot pipe 8 has a foot plate body 31 made of an aluminum plate fixed to the opening 11 of the semi-cylindrical member 9 by welding or the like. The step plate body 31 is disposed slightly below the end of the semi-cylindrical member 9. A rubber tread 32 is fixed to the upper surface of the tread body 31. An arrow-shaped protrusion 33 is integrally molded on the lower surface of the step plate 32. By inserting the protrusion 33 into a hole 34 formed in the step plate body 31, the step plate 32 can be prevented from coming off and integrated. The upper surface of the tread plate 32 is provided substantially flush with the end of the semi-cylindrical member 9. On the other hand, on the upper surface of the tread plate 32, the projections 12 and 12A are arranged integrally with the tread plate 32 so as to intersect at 90 degrees. A projection 13 having a circular plane is disposed integrally with the step plate 32 between the protrusions 12 and 12A.

As described above, in the second embodiment, the rubber tread plate 32 is provided on the upper surface of the tread plate body 31 to prevent slipping, and the ridges 12 and 12A further prevent slipping to improve safety. it can.

In the third embodiment, the semi-cylindrical member 9 and the tread plate 10 are integrally extruded and molded, and the top surface of the tread plate 10 is pressed with the ridges 12, 12A and the projections 13. By integrally molding the pedal 8 in this manner, it is possible to reduce the cost. In addition, the non-slip ridges 12 and 12A and the projection 13 are pressed, so that they can be manufactured at low cost.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, in the embodiment, a case of a tripod stepladder with an underframe provided on the upper side is shown. The support pipe may be rotatably connected, or the support pipe may be divided into upper and lower parts so that one pipe is inserted into the other pipe so that the length can be adjusted. Various modifications are possible such as a chain being detachably connected between the support tube and the support tube so as to prevent the chain from opening. Although aluminum is used as the material in the embodiment, iron or the like may be used.

[0016]

[Effect of device]

 The present invention provides a pair of left and right leg tubes having a shape that widens downward, a multi-staged tread tube with a space between the left and right leg tubes, and an upper portion of the left and right leg tubes. In a tripod stepladder equipped with a support rod whose upper end is rotatably connected, the above-mentioned tread tube has both ends of a horizontal tread plate connected to both ends of a semi-cylindrical member projecting downward, and the upper surface of the tread plate is Since a plurality of ridges are provided and the ridges are provided in a direction intersecting with each other, even if the tread is wet with water or the like, it is possible to move up and down with peace without slipping.

[Brief description of drawings]

FIG. 1 is a partially enlarged perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of an essential part showing a first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a third embodiment of the present invention.

[Explanation of symbols]

 4 leg tube 8 tread tube 9 semi-cylindrical member 10 tread plate 12 12A ridge 16 support tube

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right leg tubes having a shape that widens downwardly, a tread tube mounted in multiple stages at intervals between the pair of left and right leg tubes, and an upper portion of the pair of left and right leg tubes. In a tripod stepladder having a support rod whose upper end is rotatably connected, the tread tube has both ends of a horizontal tread plate continuously connected to both ends of a semi-cylindrical member projecting downward, and the upper surface of the tread plate is A tripod stepladder characterized in that a plurality of ridges are provided and the ridges are provided in directions intersecting with each other.