CN2219955Y

CN2219955Y - Improved multipurpose hinge for folding ladder

Info

Publication number: CN2219955Y
Application number: CN 94221376
Authority: CN
Inventors: 樊作祯; 樊杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-16
Filing date: 1994-09-16
Publication date: 1996-02-14
Anticipated expiration: 2004-09-16

Abstract

The utility model relates to an improved multipurpose hinge for folding ladders. The hinge is simpler than the existing hinge structure, is easy to produce and decreases the chance of fault occurrence during use because of multiple parts and complicated structure. Three projecting points higher than outer circumference are arranged on the outer circumference of the circular end of the inner hinge; a special-shaped spring is arranged in the outer hinge; the actions of a key and a spring piece hook are controlled by the two ends of the special-shaped spring. A fussy device arranged for controlling the action of the key by the existing hinge is got rid of.

Description

Improved multipurpose folding ladder hinge

The utility model relates to a kind of improved multipurpose folding ladder hinge.

Multipurpose folding ladder hinge is generally by inner hinge, outer hinge, and the locking mechanism that is installed on the inside and outside hinge forms.Running for control locking mechanism has many different structures, can be with reference to preceding utility model patent 88201354.8, and other various structures of publishing.These existing hinge locking mechanism complexity are made and are installed cumbersomely, have increased the chance that in use breaks down.

The purpose of this utility model is exactly to propose a kind of improved multipurpose folding ladder hinge in order to overcome above-mentioned defective.The function that this hinge is realized is identical, and internal construction is but very simple.

Design scheme of the present utility model is; Form by inner hinge, outer hinge and the handgrip, key, deformed spring and the spring leaf hook that are installed on the inner locking of outer hinge mechanism; Inside and outside hinge mat one central axis connects as one; Three protruding points that are higher than excircle are set on the excircle of inner hinge round nose; The two ends of deformed spring are connected with the spring leaf hook with key respectively.

Be arranged at key its rear end in the outer hinge and be subjected to the thrust of deformed spring, order about it and enter lock-out state.The middle part of deformed spring and spring leaf hook mat one bearing pin are fixed in the outer hinge, the end pressuring spring sheet hook of deformed spring is that rotate towards the direction near key at the center with the bearing pin, when moving handgrip key is extruded latched position, the spring leaf hook is fixed key automatically, and state unlocks.When inside and outside hinge around central axis when increasing the angle direction and rotate, the protruding point on the inner hinge can be pushed the spring leaf hook open the control of having removed key, key reenters latched position under the promotion of deformed spring.

With reference to the accompanying drawings structure of the present utility model and operation are elaborated.

Fig. 1, inner hinge structure chart

Fig. 2, outer hinge arrangement figure

Fig. 3, locking mechanism form exploded view

One of Fig. 4, hinge locking state diagram

Two of Fig. 5, hinge locking state diagram

Fig. 6, the state of operation schematic diagram unlocks

Fig. 7, hinge folded position figure

Figure 1 shows that the structure of inner hinge 1: inner hinge is stamped to form by steel plate, has three keyways on its round nose, also has three protruding points that are higher than excircle on the excircle simultaneously.Figure 2 shows that the structure of outer hinge 2, outer hinge also is stamped to form by steel plate, has identical slot on its symmetrical both sides.Inner hinge 1 connects as one with outer hinge 2 mat central axiss 3, and can rotate around central axis 3 and see Fig. 4 to Fig. 7.

Fig. 3 has shown the locking Distribution of Institutions figure that is located at outer hinge inside.In the slot of hinge 2 key 4 is set outside, key 4 can move forward and backward in the hole, key 4 shape that is rectangle.Deformed spring 6 is connected within the outer hinge 2 with spring leaf hook 5 mat bearing pins 7.Deformed spring 6 is formed by the spring steel wire coiling, insert respectively in key 4 bodies on two tops, the two ends that are connected with key 4 are concentric semicircle respectively, mid portion coiled two symmetrical groups form concentric spirals, the rectangle that is opening between two groups of form concentric spirals, bearing pin 7 inserts in two groups of form concentric spirals of deformed spring 6, and the rectangular portion sub-support of deformed spring 6 middle part of spring leaf hook 5.Handgrip 8 mat bearing pins 9 are connected within the outer hinge 2.

Below operation of the present utility model is described.

As Fig. 4, shown in Figure 5, when keyway of inner hinge 1 with outside the slot of hinge 2 when overlapping, the promotion that key 4 is subjected to deformed spring 6 enters keyway, and inside and outside hinged lock is fixed on the predetermined angle.

Spring leaf hook 5 is subjected to the compressing of deformed spring 6 to key 4 directions, and when carrying handgrip 8 extruded keyways with key 4, spring leaf hook 5 was fixed on key 4 on the position outside the keyway automatically, and this moment, the lock-out state of inside and outside hinge was disengaged, and saw shown in Figure 6.

Under Fig. 6 state, inner hinge 1 along E to rotate or outside hinge 2 along F and rotation, the protruding point of inner hinge 1 can be pushed the spring leaf hook open automatically, has removed the control to key 4, key 4 withstands the outer circumference portion of inner hinge 1 under the promotion of deformed spring 6.Rotate inside and outside hinge again, key can be pushed in the keyway of a vicinity of inner hinge again, and inside and outside hinge is locked again.

Under Fig. 6 state, or under other unlocked states, inner hinge 1 along H to or outside hinge 2 along G to rotation, hinge can be amounted to into the state of Fig. 7.

In sum, design of the present utility model has been finished the function of hinge locking mechanism with several simple parts, has realized the design's purpose.

Claims

1, improved multipurpose folding ladder hinge, it is characterized in that: hinge is interior outside is that the center is provided with a deformed spring with a bearing pin, and an end of this deformed spring is connected with key, promotes moving of key, the other end is supporting the middle part of spring leaf hook, and pressuring spring sheet hook rotates towards the direction of key.

2, by the described improved multipurpose folding ladder hinge of claim 1, it is characterized in that: the excircle of inner hinge round nose is provided with three protruding points that are higher than excircle.

3, by the described improved multipurpose folding ladder hinge of claim 1, it is characterized in that: deformed spring is formed by the spring steel wire coiling.Its two ends that are connected with key are concentric semicircle respectively, are the rectangle of opening between the mid portion coiled two symmetrical groups form concentric spirals, two groups of form concentric spirals.