Connecting sleeve for extension ladder

Abstract

A connecting sleeve for an extension ladder is provided, which includes a connecting ring (1) and a connecting block (2). A rotary seat (3) and a rotary panel (4) are set on the joint surface between the connecting block (2) and the connecting ring (1). The rotary seat (3) is fixed relative to the connecting ring (1), and a socket (31) is set in the centre of the rotary seat (3). A rotating shaft (32) extends to the centre of the socket (31) from two sides of the socket (31) respectively, and a vertical part (41) of the rotary panel (4) is inserted into the socket (31); furthermore, a torque spring (5) is installed outside the rotating shaft (32) so that the horizontal part (42) of the rotary panel (4) can be rotated towards the connecting block (2) about the rotating shaft. When the extension ladder is folded, a fixed safe space between the rungs of the ladder is provided by the rotary panels (4) for preventing fingers from being clamped, meanwhile, the integral height of the ladder can be reduced so as to facilitate package and transportation of the ladder when the horizontal part (42) of the rotary panel (4) is folded.

Description

technical field [0001] The invention relates to the technical field of telescopic ladders, in particular to a connecting sleeve for telescopic ladders. Background technique [0002] Ladders have been widely used in construction, decoration, advertising, and family housing fields. At present, the more popular ones on the market are telescopic ladders that can be retracted up and down. When not in use, they can be shortened and are easy to store and carry. As the patent No. is ZL200420091638.2 (announcement number is CN2716479Y) prior patent "a kind of telescopic ladder", just discloses such a kind of telescopic ladder, and it comprises horizontal bar and vertical bar, and vertical bar is that several joint casing pipes can It is telescopically socketed, a plurality of horizontal bars are placed between two opposite vertical bars, and telescopic pivot pins are respectively arranged at both ends of each transverse bar, and the pivot pins are respectively opened in the casing a...

AI Technical Summary

Problems solved by technology

When this kind of telescopic ladder is in use, since there is no fixed gap between the upper and lower cross bars, the user's hands are generally supported on a certain cross bar. When the telescopic ladder is folded, the upper cross bar will be pressed to the bottom Fingers on the crossbar, there is an unsafe hidden danger

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