CN2122928U

CN2122928U - Positioning joint for foldable aluminium ladder

Info

Publication number: CN2122928U
Application number: CN 92224218
Authority: CN
Inventors: 林松洲
Original assignee: SHIYUAN INDUSTRY Co Ltd
Current assignee: SHIYUAN INDUSTRY Co Ltd
Priority date: 1992-06-04
Filing date: 1992-06-04
Publication date: 1992-11-25

Abstract

The utility model relates to a positioning joint for a folding aluminium ladder, which comprises a pair of inner and outer shell half bodies which are coaxially riveted together, wherein, the inner and the outer shells can be mutually changed angles. The outer margins of the circular disk parts of the inner shells are provided with a positioning slot mouth for embedding a lock block which is arranged at two outer shell half bodies and can be moved at a long square opening arranged at the corresponding position of two outer shell half bodies. An annular gap formed by the inner shells and the outer shells is provided with a circular ring piece which can be revolved by the same axial and a tension spring is linkedly arranged at one end of the circular ring piece and the outer shell half body at the same side. When the lock block is pried up to isolate any positioning slot mouths, the circular ring piece can be revolved by the tension of the spring to seal the slot mouths and the inner shells and the outer shells are mutually revolved to change angles.

Description

Positioning joint for foldable aluminium ladder

The utility model relates to a kind of improved collapsible aluminium ladder positioning joint.

The common used positioning joint of collapsible aluminium ladder adopts inner housing and shell body integrated two forms respectively, positioned internal assembly than class joint is to assemble in limited space when assembling, quite inconvenience, except assembly is difficult for, the setting of inner locking mechanism also causes the weakening of intensity, certainly will increase reinforced structure, reinforcement then causes the increase of manufacturing cost.The joint that other is made up of a kind of mode, the not enough installing in this type of inner space, joint locking mechanism, therefore locking mechanism certainly will be installed in the outside in joint, and locking mechanism there is situation about damaging because of accidental impact to take place outside being installed in the joint, and the inharmonic impression of outward appearance is arranged.

The purpose of this utility model is to overcome the many disadvantages that the employed positioning joint of folding aluminium ladder commonly used is produced, a kind of improved folding aluminium ladder positioning joint is proposed, this positioning joint adopts two pairs of inside and outside shell halfbodies of opposite, can be coaxial stacked successively and locking mechanism and inside and outside shell halfbody are combined, so, make the assembly in whole joint more convenient, quicker.

The folding aluminium ladder positioning joint of inspecting or reconfiguring also can be dismantled in position that can absolutely clear each member of affirmation when another purpose of the present utility model provides a kind of assembly if any fault.

A purpose more of the present utility model provides a kind ofly to be had above-mentioned particular configuration and can make lighter and handier, the laborsaving and safer folding aluminium ladder positioning joint of operation.

The utility model is by an inner housing, one shell body, in being placed in, rotational circle ring plate in the shell body, lock dog, spring, pull handle, and in inciting somebody to action, shell body can rotate the centrally-pivoted axle that combines freely relatively and constitute, wherein, shell body forms respectively and can close toward each other, form that an end has cake portion and the other end be the tubulose base portion on, down in two symmetry shapes, the shell halfbody, the central authorities of shell halfbody form dimple to hold the two ends head of above-mentioned centrally-pivoted axle, to be that the center is rotatable with the pivot be folded in above-mentioned circular ring plate freely, in following any side, between the shell halfbody, this circular ring plate has an annulus portion, one since then an epitaxial lateral overgrowth of annulus portion stretch and terminal first extension that forms upwards vertical bending catch, one contiguous this extension and being therewith extends in parallel and terminal second extension of vertical kink as the spring steady pin that make progress that form, and one be adjacent to that second extension extends in the same way and surpass steady pin, as the 3rd extension of block arm.

On the formed cake of two inner casing halfbodies, the one end portion outer rim side wall of the inner housing in the utility model,, can form a breach at least at equidirectional apart from locating notch one suitable distance.Circular ring plate the catch inboard of extended first extension can be formed with radial cut dentation projection.When the base portion of the base portion of two inner casing halfbodies and two shell halfbodies was a straight line (180 °), the adjacent side wall peristoma of the base portion of this two shells halfbody and dome portion can be butted on the side wall external surface of two inner casing halfbodies.Circular ring plate the catch end of extended first extension can radially extend between the inner casing halfbody of opposite side and the shell halfbody among the formed annular gap.

Above-mentioned and some other purpose of the present utility model can be obtained further understanding by the detailed description below in conjunction with accompanying drawing with characteristics.

Fig. 1 is an outward appearance phantom drawing of the present utility model;

Fig. 2 is the lateral view of the utility model partly cut-away;

Fig. 3 is the utility model folding state and the front elevation drawing of removing a shell halfbody;

Fig. 4 is one of operation chart of the present utility model;

Fig. 5 is two of an operation chart of the present utility model;

Fig. 6 is three of an operation chart of the present utility model;

Fig. 7 is four of an operation chart of the present utility model;

Fig. 8 is the phantom drawing of the utility model circular ring plate;

Top view when Fig. 9 is 180 ° for the utility model;

Figure 10 is the front elevation drawing of Fig. 9.

As shown in Figure 1, 2, the utility model by two

inner casing halfbody

1A, 1B and two

shell halfbody

2A, 2B with a pivot 3 can be mutually pivotally the pivot knot form together, wherein can turn round in the formed gap between the inner casing halfbody 1B of a side and the shell halfbody 2B and contain a circular ring plate 4(versatilely and see Fig. 2).

As shown in Figure 3, after one shell halfbody 2A removed, as seen another shell halfbody 2B goes up with body and washes off formation lock dog guide rod seat 21, and the movable slotted hole 22 of rectangular lock dog, install therebetween one can be in slotted hole 22 movable lock dog 5, lock dog 5 one sides are extended one and are levered up plate 51, a guide rod 52 is extended in the lower end of lock dog 5, be equipped with a pressure coil spring 53 on the guide rod 52, it props up guide rod seat 21.Tie a pull handle 6 with the correspondence position pivot of lock dog 5 on the shell body 1, pull handle 6 one the inners are extended one and can be reached lock dog and lever up sled pawl 61 in plate 51 scopes of activities.

Circular ring plate 4 shown in Fig. 3,8 forms a vertical catch 42 that bends on first extension 41 that the one side is extended, be formed with zigzag projection 43 on the catch 42, and the upper end of catch 42 also can oppositely bend, shown in the dotted line among Fig. 8; One near first extension and be second extension 44 that extends in parallel with it, its terminal spring steady pin 45 that upwards vertically is bent into; The outside of spring steady pin is in abutting connection with extending the 3rd extension as block arm 46 in the same way; Cross-under has a pulling force helical spring 47 between another spring steady pin 23, two steady pins 45 and 23 and form in the appropriate location of the shell halfbody 2B of correspondence.

As shown in Figure 3, cake portion 11 outer rims of inner casing 1 form several locating notches 12, and when both base portions of inner housing of the present utility model 1 and shell body 2 are parallel shape when (promptly being 0 ° of angle), lock dog 5 is resisting spring 52 to prop up catch 42.The interval clockwise one of the locating notch 12 of cake portion 11 outer edge sides of inner housing 1 is suitably apart from being formed with a breach 13 again.

As shown in Figure 4, when both base portions of inner housing 1 and shell body 2 drew back each other, circular ring plate 4 was along with the revolution of shell body 2A one, and the projection 43 of upper stop piece 42 is during by breach 13, and catch 42 is subjected to the compressing of lock dog 5, and projection 43 buckles in the breach 13.

As shown in Figure 5, continue to enlarge the angle between inner housing 1 and shell body 2 both base portions, be subjected to the compressing of lock dog 5 because of catch 42, also be subjected to stopping of breach 13, the surface that lock dog 5 promptly skids off catch 42 props up the outer rim of the cake portion 11 of inner housing 1, because of lock dog 5 and shell body 2 turn round integratedly, and circular ring plate 4 is motionless, so 47 on spring is by stay bolt.

As shown in Figure 6, continue to enlarge the angle between inner housing 1 and shell body 2 both base portions, when lock dog 5 passed through locating notch 12, lock dog 5 was embedded within the locating notch 12 by the compressing of spring 53, then inner housing 1 and the locked each other fixed angle that is of shell body 2.

As shown in Figure 7, when desiring another angle of conversion, as long as that pulls that pull handle 6 order sled pawls 61 prop up lock dog levers up plate 51, resisting spring 53 to prize lock dog 5,, lock dog 5 breaks away from locating notch 12 in case being levered up fully, and with the outer rim of cake portion 11 at interval during a gap, catch 42 is inserted in the aforementioned gap by the pulling force guiding of spring 47 promptly, and blocks locating notch 12 simultaneously, and lock dog 5 promptly must not enter notch again, then this moment, inside and outside housing was released each other, can launch or folding again.

When aforementioned lock dog 5 of the present utility model entering any location during notch 12, all adopt the same steps as shown in Fig. 3 to 7, so do not give unnecessary details in addition.

Shown in Fig. 9,10, when inside and outside shell base portion of the present utility model was 180 ° of expansion and locking, the edge of the back side wall 24 of

shell body

1A, 1B just propped up the back side wall 14 of

inner housing

1A, 1B, the intensity in the time of so can significantly strengthening this state.

As mentioned above, be not difficult to find out, the utility model is because of adopting inside and outside shell a pair of inner casing halfbody and a pair of shell halfbody form that is symmetry equally that is symmetry, the circular ring plate that adds a particular design constitutes, therefore its simple structure can be simplified the required skill of combination significantly in regular turn by part overlapping device location during assembly, reach Rapid Combination, the purpose that reduces cost.

Claims

1, a kind of collapsible aluminium ladder positioning joint, it is by an inner housing, one shell body, in being placed in, rotational circle ring plate in the shell body, lock dog, spring, pull handle, and in inciting somebody to action, shell body can rotate the centrally-pivoted axle that combines freely relatively and constitute, it is characterized in that: in above-mentioned, shell body form respectively can close toward each other form that an end has cake portion and the other end be the tubulose base portion on, down in two symmetry shapes, the shell halfbody, the central authorities of shell halfbody form dimple to hold the two ends head of above-mentioned centrally-pivoted axle, to be that the center is rotatable with the pivot be folded in above-mentioned circular ring plate freely, in following any side, between the shell halfbody, this circular ring plate has an annulus portion, one since then an epitaxial lateral overgrowth of annulus portion stretch and terminal first extension that forms upwards vertical bending catch, one contiguous this extension and being therewith extend in parallel and the terminal vertical kink that makes progress that forms as second extension of spring steady pin, and one be adjacent to that second extension extends in the same way and surpass three extension of steady pin as the block arm.

2, collapsible aluminium ladder positioning joint as claimed in claim 1 is characterized in that apart from locating notch one suitable distance, forming a breach at least at equidirectional on the formed cake of two inner casing halfbodies, the one end portion outer rim side wall of inner housing.

3, collapsible aluminium ladder positioning joint as claimed in claim 1, be characterised in that circular ring plate the catch inboard of extended first extension be formed with radial cut dentation projection.

4, collapsible aluminium ladder positioning joint as claimed in claim 1, when the base portion that it is characterized in that the base portion of two inner casing halfbodies and two shell halfbodies was a straight line (180 °), the adjacent side wall peristoma of the base portion of this two shells halfbody and dome portion was butted on the side wall external surface of two inner casing halfbodies.

5, collapsible aluminium ladder positioning joint as claimed in claim 1, it is characterized in that circular ring plate the catch end of extended first extension can radially extend between the inner casing halfbody of opposite side and the shell halfbody among the formed annular gap.