CN2217681Y - Self-locking positioning joint for folding ladder - Google Patents

Abstract

The utility model relates to a self-locking positioning joint for folding ladders, which can be operated by one person. The utility model has the advantages of free switching, adjustable regulation of blocking positions and simple structure. An unlock mechanism of the utility model adopts a handle type double-brake eccentric wheel integrating a handle and a double-brake eccentric wheel, the handle type double-brake eccentric wheel is positioned on an eccentric position corresponding to a central axis and arranged between circular disks of an inner and an outer casings of the positioning joint, and the double-brake eccentric wheel has a same axis with the inner and the outer casings. The handle type eccentric wheel is connected with the casing outside a lock via a reposition tension spring, and an arc surface of the eccentric wheel adopts an involute shape.

Description

Folding ladder lock-bit joint

The utility model relates to a kind of Folding ladder lock-bit joint, belongs to the structure member field of general ladder.

The Folding ladder positioning joint that has occurred in the market, as the patent No. is 88208536.0 technology, though have many good qualities, but still come with some shortcomings, show that mainly needing another hand of proficiency staircase that unlocking handle is revolved when unblanking adds anticlockwise power, simultaneously two terraced bars of same hinge are revolved and add opposite force, make it backward rotation and reach the folding adjusting, and every pair of Folding ladder has some to the lock-bit joint, bring certain difficulty to the unlock operation adjusting, especially difficulty more during the one man operation, its two, amount to and can only transfer a gear when regulating at every turn, regulate two above gears, then need the repetition aforesaid operations repeatedly, promptly the lock-bit joint can not schedule any gear by disposable lock, also has deficiencies such as complex structure simultaneously.

The purpose of this utility model is in order to overcome above-mentioned deficiency of the prior art, a kind of single can operation to be provided, once can tune to any gear, Folding ladder lock-bit joint easy to use simple in structure.

The utility model Folding ladder lock-bit joint, form by inner and outer shell, self-locking mechanism, unlocking mechanism, central axis, its unlocking mechanism be handle and double-gate eccentric wheel be integrated with respect to the handle type double-gate eccentric wheel of central axis in eccentric position, between the dish portion of positioning joint inner and outer shell garden, coaxial with inner and outer shell, this eccentric wheel garden arc adopts the involute cambered surface, and roller is equipped with in the positioning sliding block end in its self-locking mechanism.

Fig. 1 is a Folding ladder self-locking joint structural representation.

Fig. 2 is a Folding ladder lock-bit joint BB sectional view.

Referring to accompanying drawing, 1 is self-latching hinge joint shell body among the figure, 2 is the hinge joint inner housing, 3 is handle type double-gate eccentric wheel, be to open a tool square opening 5 on 1 the shell body tube 4 at label, positioning sliding block 6 is arranged in the hole, pallet 7 pilot pins 8, stage clip 9, carriage 10, pulley 11 is equipped with in the end of positioning sliding block 6, pivot pin 12, the groove garden dish portion centre bore of inner housing 2 is equipped with liner 13, on the rivet shaft 14 of the centre bore of inner and outer shell with being through at handle type double-gate eccentric wheel 3, have some square locating notches 15 on week in inner housing garden dish portion garden, inner housing pipe dress portion is 16, when hinge casing body 1 and inner housing 2 are one, tube 5 by central axis 14 riveted joints, 16 in line during state, handle type double-gate eccentric wheel is under the effect of extension spring 12, unlatching puts in place, and positioning sliding block 6 embeds in a certain locating notch of inner housing 2 under the active force of stage clip 9, and positioning joint is locked, when desire changes the positioning joint angle, the shank type double-gate eccentric wheel 3 of shaking hands earlier, the handle up time rotate in place, near shell body 1, this moment, eccentric wheel pressed down positioning sliding block 6 synchronously outside inner hinge housing 2 a certain breach, and promptly rotatable inner housing 2 and shell body 1 are in any gear; Otherwise release handle formula double-gate eccentric wheel 3 puts in place relative to hinge housing 1 counter-clockwise the rotation at the effect lower handle of stage clip 9, and positioning sliding block 6 pallets 7 are within a certain breach that embeds inner housing 2 under the active force of stage clip 9 again.

The utility model has following advantage than prior art:

1, random angle is made in the same a pair of self-latching hinge joint of single with the hands while manipulation ladder Degree is regulated.

Positioning sliding block breaks away from locating notch when 2, unblanking, and not limited by gear, promptly once can transfer to any gear.

3, adopt handle type double-gate eccentric wheel structure, have simple in structurely, used part is few in addition, and cost is low.

Claims (2)

1, a kind of Folding ladder lock-bit joint is mainly by hinge casing body, inner housing, self-locking mechanism, unlocking mechanism, central axis is formed, it is characterized in that unlocking mechanism be handle and double-gate eccentric wheel be integrated with respect to the handle type double-gate eccentric wheel of central axis in eccentric position, between the dish portion of positioning joint inner and outer shell garden, coaxial with inner and outer shell, roller is equipped with in the positioning sliding block end in this self-locking mechanism.

2, handle type double-gate eccentric wheel as claimed in claim 1, its garden cambered surface adopts the involute cambered surface.

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