Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A telescopic ladder, including a left column and a right column, which are symmetrical to each other and arranged longitudinally, and a plurality of steps which are arranged transversely, each of the columns being formed by socketing a smaller tube in a bigger tube, one of the steps being arranged between upper ends of two tubes of a same diameter; an instep-operable folding switch is provided below a first step on the bottom of the ladder; the instep-operable folding switch includes an operating lever on which an operating gasket is fixed; each of two ends of the operating lever comes into contact with a lower end of one transmission bar, an upper end of the transmission bar comes into contact an end of a pin switch for a second step, and the other end of the pin switch is hinged to a middle portion of a pin via a round pin; a front end of the pin is fitted in positioning holes of two columns corresponding to the second step, and a rear end of the pin is resisted against a return spring; and the return spring is located within a pin connector which is fixed within the second step. The present invention provides a telescopic ladder by which the safety risk caused by the operation of the folding switch by a hand can be effectively avoided and the safety can be enhanced.
A telescopic ladder, including a left column and a right column, which are symmetrical to each other and arranged longitudinally, and a plurality of steps which are arranged transversely, each of the columns being formed by socketing a smaller tube in a bigger tube, one of the steps being arranged between upper ends of two tubes of a same diameter; an instep-operable folding switch is provided below a first step on the bottom of the ladder; the instep-operable folding switch includes an operating lever on which an operating gasket is fixed; each of two ends of the operating lever comes into contact with a lower end of one transmission bar, an upper end of the transmission bar comes into contact an end of a pin switch for a second step, and the other end of the pin switch is hinged to a middle portion of a pin via a round pin; a front end of the pin is fitted in positioning holes of two columns corresponding to the second step, and a rear end of the pin is resisted against a return spring; and the return spring is located within a pin connector which is fixed within the second step. The present invention provides a telescopic ladder by which the safety risk caused by the operation of the folding switch by a hand can be effectively avoided and the safety can be enhanced.
TELESCOPIC LADDER
AUSZIEHBARE LEITER
ÉCHELLE TÉLESCOPIQUE
PAN YUEJIN (Autor:in)
14.08.2019
Patent
Elektronische Ressource
Englisch
IPC:
E06C
LADDERS
,
Leitern