CN2076057U

CN2076057U - Crooked wheel-fork and long-handle cart for climbing up stairs

Info

Publication number: CN2076057U
Application number: CN 89215553
Authority: CN
Inventors: 张建平; 黄少华
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-08-16
Filing date: 1989-08-16
Publication date: 1991-05-01

Abstract

The utility model relates to a crooked wheel-fork and long-handle cart for climbing up stairs which is an improved multi-star wheel type cart for climbing up stairs. Every wheel fork is provided with two wheels of front and back small wheels, and the relative position of the two wheels are determined by an angle (theta) and the radius (R1, R2) of two concentric distribution circles. The function of the climbing up stairs is realized by the rolling of a small wheel on the short radius (R1) and a small wheel on the long radius (R2) next to the wheel fork on vertical two ladder surfaces, and the trace of the centre point of the wheel fork disc is close to the parallel line of the slope oblique line of the stairs. The labor saving effect corresponds to the most labor saving state in theory, and the utility model has simple structure. The utility model is a labor saving tool with practicability and can go up and down stairs with heavy goods.

Description

Crooked wheel-fork and long-handle cart for climbing up stairs

The utility model is the cart for travelling up or down stairs about a kind of improved multi-satellite wheel type, particularly a kind of labor-saving effect and the very approaching cart for travelling up or down stairs of the most laborsaving state in theory: the laborsaving instrument in the upper and lower building of a kind of carrying heavy goods.

Normally Samsung is wheeled, four stars is wheeled and five-pointed star is wheeled for the cart for travelling up or down stairs of existing multi-satellite wheel type, all makes the straight-bar type wheel fork, has symmetric shape.It is by its two steamboats of adjacent alternately on two vertical treads scrolling realization its climb the building function, for exempting to interfere, the steamboat comparison of sizes is big.This project organization is simple, cost is low, realized the tool of Weight upstairs climbing, and certain labor-saving effect is arranged in many cases.Because all steamboat is on same distribution circle, the track of its wheel disc center-point is a curve (four stars is wheeled to be straight line) that is cut in 45 ° of oblique lines, the maximum slope angle four stars wheel of its tracing point is that 45 °, pentacle weel are that 47 °, tri-star wheel are 49 °, be far longer than 30 ° of the gradient angle of general standard stair, if consider influences such as dolly deadweight, friction force, can feel painstaking in the time of upstairs greater than former weight gravity at the situation pulling force that has, downstairs impulse force is big, feels not stable again.

From theoretical analysis, know, serviceable tool with weight carrying upstairs or downstairs the time the most laborsaving state of theory be that whole center of gravity is moved along the parallel lines of the gradient oblique line of stair own.The purpose of this utility model is to design the cart for travelling up or down stairs that a kind of labor-saving effect and the very approaching and simple in structure degree of the most laborsaving state in theory are more or less the same with former multi-satellite wheel type again.

The utility model is achieved in that the tooth bar of stair being regarded as scalene right angle tooth, the method that becomes with model designs toothed disc a kind of and the stair conjugation, it has the starfish shape, its tooth is crooked, on this toothed disc, do some its corresponding simplified and optimization, the shape of getting this toothed disc is as the wheel fork dish, makes wheel fork have bending or tortuous shape or makes wheel fork with respect to wheel fork disk center (O) biasing (e) (Fig. 1, a Fig. 2) be arranged.Design a steamboat (II) at the secondary contact point place of the convex side of crooked tooth and replace profile of tooth.Also design a steamboat (I) at the tooth top place of crooked tooth and replace profile of tooth, therefore every wheel has been stuck former and later two steamboats, the concentric distribution circle at place has major radius (R2) and short radius (R1) respectively, and two steamboat centers constitute certain angle (θ) to the line of wheel fork disk center, like this, the engagement of the flank of tooth changes the rolling engagement of steamboat and tread, favourable reducing friction into.Through above-mentioned improvement, the function of climbing the building mainly is to stick steamboat (III) on the major radius (R2) scrolling realization on two vertical treads by steamboat (II) on the short radius (R1) and adjacent wheels, the maximum oblique angle of its wheel fork disk center locus of points is that 32.5 °, minimum are that 29.5 °, aviation value are 31 °, and aviation value can determine through the position of adjusting steamboat (II) according to the requirement of stair, generally gets the value more bigger than stair gradient angle (α) (α+1 ° to α+4 °).Curve (y2) very near the parallel lines (y3) of the gradient oblique line of stair own (Fig. 3), has good labor-saving effect like this.

The utility model is taken turns the steamboat of sticking than former multi-satellite wheel type of only Duoing at each, and structure is also fairly simple.Although the cost of wheel fork dish manufacturing may slightly improve and since on the track of its wheel fork disk center's point the each point inclination angle about 30 ° (be here according to the staircase design of α=30 °) labor-saving effect than the former height that manys star-wheel.

Below with reference to accompanying drawing utility model is described in further detail:

Fig. 1, Fig. 2 are the wheel fork dish structural representations that four-wheel V shape and five is taken turns V shape in the utility model.The former adopts forniciform wheel fork, the latter then to adopt the direct rod shape wheel fork of an Offset (θ).Each takes turns pronged shape is asymmetric with respect to the mean line at its place, and this utility model can also adopt the three-wheel V shape, and structure is the same similar.

Fig. 3 be finish single step stepwise movement (O-O ') three kinds of geometric locuses of process, y1 is the geometric locus of a kind of former four stars wheel sold on the market, and y2 is that geometric locus, the y3 of four-wheel V shape in the utility model is the parallel lines of the gradient oblique line of stair itself, the i.e. the most laborsaving trajectory of theory.As can be seen from the figure, y2 than y1 near y3.

Fig. 4 is to use the best strained condition figure of cart for travelling up or down stairs, can determine also therefrom to guarantee that the needed wheel fork of this state disk center's point (O) arrives the distance of gloves (9) (OA), and it must be sufficiently long.Because the P that makes a concerted effort that tensile force f and people's body weight G produces.This three's absolute value has following relation (P-G)＜F, and (P-G) that finally act on the person passes through the human body line of centers, and this state is not only laborsaving but also make the people feel steady.

Fig. 5 is that the embodiment of four-wheel V shape in the utility model is always schemed.A wheel fork dish (1) is installed on the axletree of vehicle body frame (7), can freely rotate, and determine endplay by axle sleeve (10) and fixing screw (11).Wheel fork dish (1) can be inblock cast or punch forming, can use the framing member welding fabrication as adopting the offset structure.Its angle (θ) should be in 5 ° to 35 ° value, ratio (R1:R2) should be in 2/5 to 4/5 value.Steamboat (2) constitutes the double linked wheel structure by the hole on pivot pin (3) and the wheel fork dish (1).By spring cotter (4) location, guarantee that steamboat rotates flexibly.The steamboat material should adopt the all-metal manufacturing, and the ratio (d:L) of diameter (d) and single-order ladder long (L) should be between 1/12 to 1/8.Handlebar stem (8) is connected with vehicle body frame (7) by hinge axis (6), and wheel fork disk center point (O) be to should getting 1.4 meters to 1.6 meters to the distance of gloves (9) (OA), and this car can folding storage, determines its straight-bar state by slotting Xiao (5).This car is as being used to load and transport LP gas cylinder.Then full car weight force line adds that by its wheel fork disk center point (O) the O locus of points is the shape of y2 among Fig. 3, feels laborsaving, steady in the use.

Claims

1, a kind of cart for travelling up or down stairs of the multi-satellite wheel type of forming by wheel fork dish [1], steamboat [2], vehicle body frame [7] and handlebar stem [8], it is characterized in that on the wheel fork dish of this cart for travelling up or down stairs, every wheel fork has former and later two steamboats [I, II], be in respectively on two concentric distribution circles of major radius [R2] and short radius [R1], and two steamboat centers [O1, O2] constitute certain angle [θ] to the line of wheel fork disk center [O], thereby make wheel fork have bending or tortuous shape, perhaps make wheel fork a biasing [e] be arranged with respect to wheel fork disk center.

2, by the described cart for travelling up or down stairs of claim 1, it is characterized in that every wheel sticks two steamboat center (O1, O2) is advisable with 5 ° to 35 ° to certain angle (θ) that line constituted of wheel fork disk center (O), the ratio (R1:R2) of two distribution circle radiuses of its line defined, its ratio is advisable with 2/5 to 4/5.

3, by claim 1,2 described cart for travelling up or down stairss, the wheel fork bar number that it is characterized in that the wheel fork dish is three of well-distributeds, four or five.

4, by the described cart for travelling up or down stairs of claim 1, it is characterized in that the steamboat material is an all-metal system, the ratio (d:L) of its diameter (d) and single-order ladder long (L) is advisable with 1/12 to 1/8.

5, by claim 1,2 described cart for travelling up or down stairss, it is characterized in that wheel fork disk center (O) is to the distance of gloves (9) (OA) is advisable with 1.4 meters to 1.6 meters.