JPH0389898U

JPH0389898U -

Info

Publication number: JPH0389898U
Application number: JP15024289U
Authority: JP
Priority date: 1989-12-28
Filing date: 1989-12-28
Publication date: 1991-09-12

Description

[Brief explanation of the drawing]

第１図〜第５図は本考案の第１実施例を示す図
で、第１図、第２図及び第３図はこの考案の脚立
を示す正面図、側面図及び平面図、第４図は本考
案の要部を示す斜視図、第５図イは第４図の横断
面図、同ロは同じく縦断面図である。第６図は本
考案の第２実施例で第５図に相当する要部横断面
図イ及び縦断面図ロである。第７図は本考案にお
ける第３実施例で内嵌パイプに形成される３種の
凹凸の縦断面形状を示し、第８図は本考案におけ
る第４実施例の要部横断面図イ及び縦断面図ロ、
第９図は同じく第５実施例の要部横断面図イ及び
縦断面図ロを示す。第１０図〜第１３図は各々従
来技術の側面図、要部拡大正面図、要部拡大断面
側面図および要部横断面図である。なお、図面において、１，４０……踏板、２，
３，４２……梯子脚、４，４１……ステツプ、５
，６……補強材、７，２６……爪部、８，４３…
…支え脚、９，４４……内嵌パイプ、９ａ，１０
ａ……偏平部、１０，４５……外嵌パイプ、１１
……凹凸、１２……押圧手段、１３……ブラケツ
ト、１４……当座、１５……固定ネジ部、１６…
…移動ネジ部、１７……カム、１８……カム軸、
１９……レバー、２０……バネ、２１，４７……
連通孔、２７……ホルダー、２８……取手、２９
……フツク、３０……鎖、３１……補助踏板、４
６……貫通孔、４８……ボルト、である。 1 to 5 are views showing the first embodiment of the present invention, and FIGS. 1, 2, and 3 are front, side, and plan views showing the stepladder of this invention, and FIG. 5 is a perspective view showing a main part of the present invention, FIG. 5A is a cross-sectional view of FIG. 4, and FIG. FIG. 6 is a cross-sectional view (A) and a vertical cross-sectional view (B) of a main part of a second embodiment of the present invention, which correspond to FIG. 5. FIG. 7 shows the vertical cross-sectional shapes of three types of unevenness formed on the inner pipe in the third embodiment of the present invention, and FIG. Surface drawing b,
FIG. 9 similarly shows a cross-sectional view A and a vertical cross-sectional view B of the main part of the fifth embodiment. 10 to 13 are a side view, an enlarged front view of the main part, an enlarged cross-sectional side view of the main part, and a cross-sectional view of the main part, respectively, of the prior art. In addition, in the drawing, 1, 40...treadboard, 2,
3,42...Ladder leg, 4,41...Step, 5
, 6... Reinforcement material, 7, 26... Claw portion, 8, 43...
...Support leg, 9, 44...Inner pipe, 9a, 10
a... Flat part, 10, 45... Outer fitting pipe, 11
... Unevenness, 12 ... Pressing means, 13 ... Bracket, 14 ... Temporary stop, 15 ... Fixing screw part, 16 ...
...Moving screw part, 17...Cam, 18...Cam shaft,
19...Lever, 20...Spring, 21,47...
Communication hole, 27...Holder, 28...Handle, 29
...Hook, 30...Chain, 31...Auxiliary tread, 4
6...through hole, 48...bolt.

Claims

[Claims for Utility Model Registration] (1) The upper ends of a pair of substantially opposing ladder legs, which are connected to each other by a plurality of steps and are framed in the form of a ladder, are respectively fixed to one side of the tread, and the upper ends of the ladder legs are fixed to the other side of the tread. A work stepladder comprising a supporting leg pivoted opposite to a ladder leg, wherein the supporting leg has a telescoping structure in which a pair of pipes are fitted into each other so as to be movable forward and backward;
A plurality of projections and recesses are provided in the longitudinal direction of an inner pipe that constitutes one of these pipes and is fitted inward, and a stop that contacts and presses the recesses, and an inner pipe that constitutes the other of the pair of pipes and is inserted from the outside. For work that is characterized by drilling a through hole in the fitting external pipe to allow the corresponding seat to pass through, and providing a pressing means for pressing the corresponding seat to fix the pair of pipes to an arbitrary length. Stepladder extension device. (2) The extension/retraction device for a working stepladder according to claim 1, wherein the pressing means for pressing the seat is a screw, a cam lever, or a spring mechanism. (3) The operation according to claim 1 or 2, characterized in that each of the pair of pipes is formed with a mutually engageable flat portion extending in the longitudinal direction to prevent rotation of each other. Telescoping device for stepladders.