CN202380969U

CN202380969U - Locking structure of extension ladder

Info

Publication number: CN202380969U
Application number: CN2011205413892U
Authority: CN
Inventors: 应逢若
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-22
Filing date: 2011-12-22
Publication date: 2012-08-15
Anticipated expiration: 2021-12-22

Abstract

The utility model discloses a locking structure of an extension ladder, comprising segment rods, a corresponding horizontal rail and a corresponding connecting sleeve, wherein the connecting sleeve comprises a sleeve ring part sleeved with the segment rod and an inserting part inserted into the horizontal rail; a bolt is arranged in the inserting part; the bolt can move horizontally relative to the connecting sleeve and can be exposed to lock neighbor two upper and lower segment rods together; a spring for enabling the bolt to keep exposed tendency and a push rod connected with the bolt are further arranged in the inserting part; a first propping surface is arranged on the bolt; a second propping surface matched with the first propping surface is arranged on the upper end of the push rod; the lower end of the push rod penetrates through the horizontal rail and is exposed on an anti-clamping jacket fixed on the lower end surface of the horizontal rail; when the lower end of the push rod is propped or pressed to move upwards, the bolt moves horizontally to achieve unlocking. The locking structure of the extension ladder has the advantages of simple structure, convenient manufacturing, low cost, accurate control, reliable unlocking and so on.

Description

A kind of latch-up structure of extension ladder

Technical field:

The utility model relates to extension ladder, particularly a kind of latch-up structure of extension ladder.

Background technology:

The release of extension ladder latch-up structure divides manual release and touches two kinds of structures of release in the prior art, and wherein, the extension ladder that touches unlocking structure is when drawing in, because the relative manual unlocking structure of operation is more easy, so use more at present.

Accompanying drawing 1 discloses a kind of comparatively common shake-up unlocking structure at present; It comprises pole 1 and corresponding crosspiece 2 and adapter sleeve 3; Be provided with in the adapter sleeve 3 can expose and with together latch 4 of adjacent two joint joint rod lock up and down, make latch 4 remain the spring 5 of the trend of exposing and the unlock switch 6 that links to each other with latch 4; Unlock switch 6 upper ends are fastened in the annular groove 41 of latch 4 rear ends; Unlock switch 6 lower ends are passed opening on the crosspiece 2 and are stretched into one and be fixed in the anti-pinch hand saver cover 7 of crosspiece 2 lower surfaces, and lower ends are provided with the push rod 8 replaced with unlock switch 6 lower ends in the anti-pinch hand saver cover 7, and the lower end of this push rod 8 exposes to anti-pinch hand saver cover 7; The upper end is embedded with a limiting plate 9 in the anti-pinch hand saver cover 7; Offer the horizontal concrete chute that supplies unlock switch 6 to pass and laterally move on this limiting plate 9, push rod 8 lower ends touched support or be pressed and on when moving, unlock switch 6 is touched and is driven latch 4 and laterally move the realization releases.Though this structure can realize upwards pushing the push rod in the next stage latch-up structure; Make push rod landing and next stage crosspiece in the upper level latch-up structure touch to and realize automatic unlocking to the upper level latch-up structure, but also have some defectives in the design, specifically; Touching of the horizontal release of latch is made up of the unlock switch that is combined together, push rod and three parts of limiting plate to structure; Not only complex structure has increased manufacture difficulty and cost of manufacture, and touches and in process, occur transmission error easily; Cause to latch laterally to separate lock control inaccurate, thereby influence the reliability of release.

The utility model content:

The goal of the invention of the utility model is to overcome the deficiency of above-mentioned prior art, provide a kind of simple in structure, easy to make, cost is low, the latch-up structure of precise control, the reliable extension ladder of release.

The utility model is realized by following technical scheme:

A kind of latch-up structure of extension ladder; Comprise pole and corresponding crosspiece and adapter sleeve; Said adapter sleeve comprises and the collar portion of pole socket and the insertion section of pegging graft with crosspiece, is provided with latch in the said insertion section, and this latch can move and can expose and two joints up and down that will be adjacent save rod lock together with respect to the adapter sleeve horizontal cross; Also be provided with spring that makes latch remain the trend of exposing and the push rod that links to each other with latch in the said insertion section; Said latch is provided with first support surface, and said push rod upper end is provided with second support surface of matching with first support surface, said push rod lower end pass crosspiece and expose to one be fixed on the crosspiece lower surface anti-pinch hand saver cover; When said push rod lower end touched to or be pressed and on when moving, said latch laterally moves and realizes release.

Said first support surface and second support surface are the inclined-plane; Also can be that said first support surface and second support surface are the mild arcwall face of angle.

Said push rod is by the round bar integral production moulding of perpendicular piece of the rectangle of upper end and lower end; Said second support surface is arranged on the upper surface of the perpendicular piece of said rectangle; The rear end of said latch is connected with the horizontal piece of a rectangle, and said first support surface is arranged on the soffit of the horizontal piece of said rectangle.

The utility model has following advantage with respect to prior art:

At first, the utility model with push rod directly and latch be connected, omitted these two intermediate members of unlock switch of the prior art and limiting plate; Therefore both simplified the structure on the one hand; Make things convenient for making, reduced cost of manufacture again, also can avoid the transmission error that exists in the indirect drive process on the other hand; Make the horizontal release precise control of latch, improve the reliability of release.

Secondly, the utility model is designed to inclined-plane or the mild arcwall face of angle with the support surface of push rod and latch, helps to increase the contact area of the two, improves the stability that cooperates between the two, and further guarantees the accurate control of push rod to the horizontal release of latch.

Description of drawings:

Fig. 1 is the shake-up unlocking structure sketch map of present common extension ladder latch-up structure.

Fig. 2 is the sketch map of the utility model extension ladder latch-up structure.

Fig. 3 is the decomposing schematic representation of the utility model extension ladder latch-up structure.

The specific embodiment:

As shown in Figures 2 and 3, be the preferred embodiment of the utility model.

The utility model extension ladder latch-up structure comprises pole 1 and corresponding crosspiece 2 and adapter sleeve 3; Adapter sleeve 3 comprises and the collar portion 31 of pole 1 socket and the insertion section 32 of pegging graft with crosspiece 2; Be provided with latch 4 in the insertion section 32; This latch 4 can with respect to adapter sleeve 3 horizontal cross move and can expose and two joint joint rod lock up and down that will be adjacent together, also be provided with the spring 5 that makes latch 4 remain the trend of exposing in the insertion section 32 and reach the push rod 6 that links to each other with latch 4.Latch 4 is provided with first support surface 41; Push rod 6 upper ends are provided with second support surface 61 of matching with first support surface 41; First support surface 41 and second support surface 61 are the inclined-plane; Push rod 6 lower ends pass crosspiece 2 and expose to one be fixed on crosspiece 2 lower surfaces anti-pinch hand saver cover 7, when push rod 6 lower ends touched support or be pressed and on when moving, latch 4 laterally moves and the realization release.

Push rod 6 is by the round bar 63 integral production moulding of perpendicular piece 62 of the rectangle of upper end and lower end, and second support surface 61 is arranged on the upper surface of the perpendicular piece 62 of rectangle, and the rear end of latch 4 is connected with the soffit that the horizontal piece of a rectangle 42, the first support surfaces 41 are arranged on the horizontal piece 42 of rectangle.

The structure of two-piece housings lengthening is adopted in the insertion section 32 of adapter sleeve 3, increasing the guiding length of latch 4, two-piece housing 321, be connected together between 322, and the Access Division is provided with the pilot hole 8 to 4 spacing guide effects of latch.

In addition, first support surface 41 and second support surface 61 also can all be designed to the mild arcwall face of angle, to improve the smoothness of fitting face.

The foregoing description only supplies to explain the usefulness of the utility model; And be not the restriction to the utility model; The those of ordinary skill in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to the category of the utility model, and the scope of patent protection of the utility model should be limited each claim.

Claims

1. the latch-up structure of an extension ladder; Comprise pole and corresponding crosspiece and adapter sleeve; Said adapter sleeve comprises and the collar portion of pole socket and the insertion section of pegging graft with crosspiece, is provided with latch in the said insertion section, and this latch can move and can expose and two joints up and down that will be adjacent save rod lock together with respect to the adapter sleeve horizontal cross; Also be provided with spring that makes latch remain the trend of exposing and the push rod that links to each other with latch in the said insertion section; It is characterized in that: said latch is provided with first support surface, and said push rod upper end is provided with second support surface of matching with first support surface, said push rod lower end pass crosspiece and expose to one be fixed on the crosspiece lower surface anti-pinch hand saver cover; When said push rod lower end touched to or be pressed and on when moving, said latch laterally moves and realizes release.

2. a kind of latch-up structure of extension ladder according to claim 1, it is characterized in that: said first support surface and second support surface are the inclined-plane.

3. a kind of latch-up structure of extension ladder according to claim 1, it is characterized in that: said first support surface and second support surface are the mild arcwall face of angle.

4. like the latch-up structure of claim 1 or 2 or 3 said a kind of extension ladders; It is characterized in that: said push rod is by the round bar integral production moulding of perpendicular piece of the rectangle of upper end and lower end; Said second support surface is arranged on the upper surface of the perpendicular piece of said rectangle; The rear end of said latch is connected with the horizontal piece of a rectangle, and said first support surface is arranged on the soffit of the horizontal piece of said rectangle.