CN2227190Y

CN2227190Y - Metal ladder with fitting structure

Info

Publication number: CN2227190Y
Application number: CN 95208814
Authority: CN
Inventors: 叶进文
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-25
Filing date: 1995-04-25
Publication date: 1996-05-15
Anticipated expiration: 2005-04-25

Abstract

The utility model relates to a metal ladder with a fitting structure, particularly a metal ladder which is composed of a pedal lever and a ladder frame, which are buckled together. The utility model comprises two ladder frames, a plurality of pedal levers and a plurality of barrel type retaining rings, wherein, the surrounding dimensions of the outer wall of each retaining ring is a little smaller than the surrounding dimensions of the inside wall of each pedal lever. Each retaining ring is provided with a bending upset head which can be buckled and contacted with the outer lateral surfaces of the ladder frames when the retaining rings are nested with the end of each pedal lever. The other end can pass across the end part joints of each ladder frame and each pedal lever. The welding positions of the retaining rings with the pedal levers formed on the ladder frames and the pedal levers are all provided with convex parts which are obtained by fan borings. The utility model has the advantages of simple structure and firm combination.

Description

A kind of wire ladder of fastening structure

The utility model proposes a kind of wire ladder of fastening structure, refer to the wire ladder that constitutes in the snapping mode between a kind of treadle and ladder especially.

Two ladders of general conventional metals ladder are consolidated mode with the spiral shell of the fixed form multipurpose screw of treadle and nut, though such structure combined and instant the phenomenon that gets loose occurs after being scrunched the power effect repeatly easily.After be modified into the structure (application number: 95201258 of buckle, 8), it is the equally spaced through hole that each treadle is established on break-through two ladders respectively, the external surface of curved riveting end and each ladder lateral wall that deducts is made at the two ends of each treadle, and inside and outside surface of the inside wall of each treadle and each ladder and lateral wall inner surface contact position are set as the flange (as shown in Figure 4) that forms because of reaming respectively.Though buckle structure is than the solid mode firm and durable of spiral shell,, whether the quality of this effect structure and flange accurately has very big relation apart from the two ends size of treadle respectively if being provided with the position.If between each flange and its corresponding each treadle apart from inaccuracy, each curved riveting end can't suitably anchor ladder.If this distance is shorter than due length, the lateral surface of then curved riveting end and ladder has caused mutual extrusion and has destroyed curved riveting end.

The purpose of this utility model is to overcome the shortcoming on the said structure, with an end retaining ring of curved riveting end is arranged, and with treadle end snapping, exempts because of flange is provided with the defective that the position inaccuracy causes, and makes and reach simpler and easy, more effective bonding state.

Design scheme of the present utility model: a kind of wire ladder of fastening structure, comprise two ladders, several treadles, it is characterized in that being provided with several tubular retaining rings, the outer wall girth of each retaining ring is slightly less than the periphery of inner wall size of each treadle, and tool one curved riveting end, fashionable with this retaining ring of box lunch and each treadle cover, should bend the lateral surface that riveting end button supports each ladder, what the other end then extended through each ladder and each treadle respectively holds joint, and in each ladder and each treadle engaged at end place, each retaining ring with each treadle both, be equipped with the protuberance that a usefulness reaming makes.

The utility model has the advantages that: the treadle two ends are flat, and retaining ring is inserted in the end of treadle, and the curved riveting end of retaining ring props up the outer wall of ladder, reach ladder and combine simple and easy firm again purpose with treadle.

Enumerate two embodiment below in conjunction with accompanying drawing:

Embodiment 1: Fig. 1 is the part exploded perspective schematic diagram of present embodiment, and Fig. 2 is a retaining ring [3] among Fig. 1 and an end of a treadle [1] and the generalized section that a ladder [2] combines.From Fig. 1, treadle [1] is a hollow square bar, and ladder [2] is a hollow rectangle support body, which is provided with uniformly-spaced through hole, in the middle part of lateral wall [22] Yu the inside wall [23] of each ladder.The shape of this through hole is identical with the appearance profile of treadle, so that the two ends of each treadle stretch into therebetween, and stretches out a segment distance.Retaining ring [3] is that an end is the square short tube of curved riveting end [34], and its outer wall periphery is slightly less than the inner peripheral wall of treadle [1], so as can with treadle [1] fit one.The end of treadle [1] is stretched out one section short distance of ladder straightly and is not established curved riveting end.When the end of retaining ring [3] and treadle [1] is linked in a time-out, the curved riveting end [34] of retaining ring just props up the lateral surface [22] of ladder [2].From Fig. 2, with reaming tool treadle [1] is made three protuberances with the position and the retaining ring [3] of ladder [2] combination, be respectively [1], [12], [13], with [31], [32], [33], wherein protuberance [11] and [31], [12] and [32], and [13] make closed state respectively with [33].The length of retaining ring [3] must be able to extend through each junction of ladder [2] and treadle [1].

Embodiment 2: Fig. 3 is the generalized section of embodiment 2.Wherein treadle [1] is made four with ladder [2] junction with reaming tool and is anchored position [11], [12], [13] and [14], wherein anchor position [14] and be positioned at the end of treadle [1], therefore form an outer opening of opening, rather than the shape of protuberance [11], [12] and [13].The outer wall periphery of retaining ring [3] is slightly less than the inner peripheral wall of treadle [1], so that can be inserted in treadle [1].Owing to have four to anchor position [11], [12], [13] and [14] on the treadle [1], therefore bonding state is firmly enough and between ladder [2], so retaining ring [3] is different from the protuberance of the reaming formation that is provided with among the embodiment 1, the outer end of retaining ring [3] is a bending end, can avoid anchoring outside position [14] is exposed to.Thereby making ladder be suitable for the person escapes injury.

Below accompanying drawing is illustrated: Fig. 1 is a kind of part schematic perspective view of fastening structure wire ladder.Fig. 2 is the generalized section of retaining ring and treadle and ladder structure among Fig. 1.Fig. 3 is the retaining ring of embodiment 2 and the generalized section of treadle and ladder structure.The ladder schematic perspective view that Fig. 4 makes up for a kind of buckle mode.

Claims

1, a kind of wire ladder of fastening structure is made up of two ladders and several treadles, it is characterized in that being provided with several tubular retaining rings, the outer wall girth of each retaining ring is slightly less than the periphery of inner wall size of each treadle, and tool one curved riveting end, fashionable with this retaining ring of box lunch and each treadle cover, should bend the lateral surface that riveting end button supports each ladder, what the other end then extended through each ladder and each treadle respectively holds joint, and in each ladder and each treadle engaged at end place, each retaining ring with each treadle both, be equipped with the protuberance that a usefulness reaming makes.

2, ask the wire ladder of 1 described a kind of fastening structure as claim, the two ends and each the ladder outer side edges joint that it is characterized in that each treadle are set as the reaming end, and each tubular retaining ring is then with curved riveting end the conflict mode of lateral surface of each ladder and each end fit of each treadle.