CN202157739U

CN202157739U - Tripodal extension ladder

Info

Publication number: CN202157739U
Application number: CN2011201766486U
Authority: CN
Inventors: 张梅珍
Original assignee: SUZHOU RONGLIDA TOOL CO Ltd
Current assignee: SUZHOU RONGLIDA TOOL CO Ltd
Priority date: 2011-05-30
Filing date: 2011-05-30
Publication date: 2012-03-07
Anticipated expiration: 2021-05-30

Abstract

A tripodal extension ladder is characterized in that the extension ladder is formed by a front lateral ladder rack and a back prop through hinge joint, wherein the front lateral ladder rack includes two upright posts, a ceiling plate and a plurality of steps; the retractable foot structures are arranged at the bottom ends of the two upright posts and the back prop; each retractable foot structure consists of a sleeve, a retractable foot and a hook pin positioning mechanism; the sleeves, as well the bottom ends of the upright posts and the back prop are integrally connected or fixedly connected; the retractable feet penetrate the sleeves so as to be connected in a sliding manner; each hook pin positioning mechanism includes a hook pin, an elastic element and a plurality of positioning holes; the tail ends of the hook pins are hinged on the sleeves, and the head parts of the hook pins are bent, penetrate the pipe walls of the sleeves, and extend in the sleeves; the positioning holes correspond to the head parts of the hook pins and are formed on the retractable feet; and the elastic elements are acted on the hook pins, so that the head parts of the hook pins extend into the sleeves and are inserted in the positioning holes in a matched manner. The tripodal extension ladder has a simple structural design, and is particularly suitable for steps at special sites such as agricultural terraced fields.

Description

The tripod extension ladder

Technical field

The utility model relates to ladder, is specifically related to a kind of double ladder of tripod.

Background technology

Ladder is the climb to a higher point daily apparatus of usefulness of people.Ladder can be divided into vertical ladder (or claiming yi shaped ladder) and double ladder basically on the structure kind, double ladder generally is by two hinged forming in ladder top, is supported over the ground by four pin; Above-mentioned existing ladder; Generally be only applicable to the level land, and inapplicable this type of step privileged place, for example agriculture terraced fields.

Summary of the invention

The utility model purpose provides a kind of tripod extension ladder, to be applicable to this type of step privileged place.

For achieving the above object; First kind of technical scheme that the utility model adopts is: a kind of tripod extension ladder; By a front side ladder with a back prop is hinged constitutes, the front side ladder is made up of two columns, one day plate and a plurality of marking time, and said two columns are at a distance of being provided with; It plate laterally is connected between the top of two columns, and a plurality of marking time also is connected between two columns and is parallel to each other; Said back prop top is hinged with the rear side middle part of day plate; The telescopic leg structure is all established in the bottom of said two columns and back prop; Said telescopic leg structure is made up of sleeve pipe, telescopic leg and hook pin detent mechanism, and said sleeve pipe is connected with the bottom one of column and back prop or is fixedly connected, and is slidingly connected in the telescopic leg threading; Said hook pin detent mechanism is made up of hook-shaped pin, flexible member and a plurality of locating hole; Said hook-shaped pin tail end is articulated on the sleeve pipe, and its head bending pass the cover tube wall stretch in the sleeve pipe, said locating hole is opened on the telescopic leg corresponding to the head of hook-shaped pin; Said flexible member acts on the hook-shaped pin, the head of hook-shaped pin is stretched in the sleeve pipe insert with locating hole to cooperate.

Related content in the technique scheme is explained as follows:

1, in the such scheme, said column is made up of head tree and secondary column, and the head tree top is fixedly connected with a day plate; Be fixedly connected with said sleeve pipe on its bottom; Secondary column is positioned at the rear side of head tree, and its top also is fixedly connected with the sky plate, and also is fixedly attached on the said sleeve pipe after the bending of bottom.

2, in the such scheme, the bottom of said telescopic leg is provided with grabs the lower margin ware, and this grabs the lower margin ware is a quadrangle or polygonal sheet material its downward bending in each bight to be made up of.

The design principle and the beneficial effect of the utility model are:

The utility model adopts the front side ladder to form with afterwards lateral brace is hinged; By two columns and a back lateral brace bottom supported at three point over the ground; And be equipped with the telescopic leg structure on two columns and the lateral brace bottom, back; So when using, can the back lateral brace be shortened, for example set up on the agriculture terraced fields so that be adapted at step.

The utility model structure design is simple, and is specially adapted to special places such as step such as agriculture terraced fields.

Description of drawings

Fig. 1 is the utility model embodiment schematic perspective view;

Fig. 2 is the sketch map of the telescopic leg among the utility model embodiment;

Fig. 3 is the sketch map of the sleeve pipe among the utility model embodiment.

In the above accompanying drawing: 1, front side ladder; 2, back prop; 3, column; 4, day plate; 5, mark time; 6, back prop reinforcing bar; 7, sleeve pipe; 8, telescopic leg; 9, hook-shaped pin; 10, grab the lower margin ware; 11, locating hole; 12, pipe fitting.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment: shown in accompanying drawing 1～accompanying drawing 3:

A kind of tripod extension ladder; See Fig. 1; By a front side ladder 1 with a back prop 2 is hinged constitutes, front side ladder 1 is marked time by two columns 3, one day plate 4 and a plurality of and 5 is formed, and said two columns 3 are at a distance of being provided with; It plate 4 laterally is connected between the top of two columns 3, and a plurality of marking time 5 also is connected between two columns 3 and is parallel to each other.

See Fig. 1; Said back prop 2 tops are hinged with the rear side middle part of day plate 4, and concrete day plate 4 is for having a quadro frame, a sheathed pipe fitting 12 on this day plate 4 the back side frame; These pipe fitting 12 middle parts are fixedly connected with the top of back prop 2, constitute the articulated structure of back prop 2 and day plate 4 with this.And, also be provided with two back prop reinforcing bars 6, between each oblique two ends and back prop 2 that are connected pipe fitting 12 of this two back props reinforcing bar 6.

See Fig. 1-3; The telescopic leg structure is all established in the bottom of said two columns 3 and back prop 2; Said telescopic leg structure is made up of sleeve pipe 7, telescopic leg 8 and hook pin detent mechanism; Said sleeve pipe 7 is connected with the bottom one of column 3 and back prop 2 or is fixedly connected, and is slidingly connected in the telescopic leg 8 upper end threadings 7.

See Fig. 1-3, said hook pin detent mechanism is made up of hook-shaped pin 9, flexible member and a plurality of locating hole 11, and said hook-shaped pin 9 tail ends are articulated on the sleeve pipe 7; And its head bending is passed sleeve pipe 7 tube walls and is stretched in the sleeve pipe 7; Said locating hole 11 is opened on the telescopic leg 8 corresponding to the head of hook-shaped pin 9, said flexible member (figure is last not to be drawn), but we can expect can using flexure strip here; Also can be torsion spring, stage clip etc.; Present embodiment uses flexure strip for example, and it acts on the hook-shaped pin 9, the head of hook-shaped pin 9 is stretched in the sleeve pipe 7 insert with locating hole 11 to cooperate.

See Fig. 1, concrete said column 3 is made up of head tree and secondary column, and the head tree top is fixedly connected with a day plate 4; Be fixedly connected with said sleeve pipe 7 on its bottom; Secondary column is positioned at the rear side of head tree, and its top is fixedly connected with a day plate 4, and also is fixedly attached to after the bending of bottom on the said sleeve pipe 7.The sleeve pipe 7 that said back prop 2 is corresponding with it connects for one, and promptly 2 of back props are bodys, and its bottom is promptly as sleeve pipe 7.

See Fig. 2; The bottom of said each telescopic leg 8 is provided with grabs lower margin ware 10; This grabs lower margin ware 10 is a quadrangle or polygonal sheet material its downward bending in each bight to be made up of, and grabs lower margin ware 10 with this and makes this tripod extension ladder be fit to be set up in mire more, is specially adapted to use on the agriculture field.

The foregoing description only is the technical conceive and the characteristics of explanation the utility model, and its purpose is to let the personage who is familiar with this technology can understand content of the utility model and enforcement according to this, can not limit the protection domain of the utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection domain of the utility model.

Claims

1. tripod extension ladder; It is characterized in that: by a front side ladder with a back prop is hinged constitutes; The front side ladder is made up of two columns, one day plate and a plurality of marking time; Said two columns are at a distance of being provided with, and a day plate laterally is connected between the top of two columns, and a plurality of marking time also is connected between two columns and is parallel to each other; Said back prop top is hinged with the rear side middle part of day plate; The telescopic leg structure is all established in the bottom of said two columns and back prop; Said telescopic leg structure is made up of sleeve pipe, telescopic leg and hook pin detent mechanism, and said sleeve pipe is connected with the bottom one of column and back prop or is fixedly connected, and is slidingly connected in the telescopic leg threading; Said hook pin detent mechanism is made up of hook-shaped pin, flexible member and a plurality of locating hole; Said hook-shaped pin tail end is articulated on the sleeve pipe, and its head bending pass the cover tube wall stretch in the sleeve pipe, said locating hole is opened on the telescopic leg corresponding to the head of hook-shaped pin; Said flexible member acts on the hook-shaped pin, the head of hook-shaped pin is stretched in the sleeve pipe insert with locating hole to cooperate.

2. according to the said tripod extension ladder of claim 1; It is characterized in that: said column is made up of head tree and secondary column; The head tree top is fixedly connected with a day plate, is fixedly connected with said sleeve pipe on its bottom, and secondary column is positioned at the rear side of head tree; Its top also is fixedly connected with the sky plate, and also is fixedly attached on the said sleeve pipe after the bending of bottom.

3. according to the said tripod extension ladder of claim 1, it is characterized in that: the bottom of said telescopic leg is provided with grabs the lower margin ware, and this grabs the lower margin ware is a polygonal sheet material its downward bending in each bight to be made up of.