JPH0756304Y2 - Pantograph jack - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pantograph jack which fully satisfies the basic structure of a jack and contributes to improving its function.

[0002]

2. Description of the Related Art A conventional pantograph jack has a gear structure, has a large number of parts, and is not practically compact.

[0003]

When mounting on a vehicle, it is difficult to make the device compact, and restrictions are placed on increasing the height of the vehicle, so that functional deterioration cannot be avoided. Moreover, in order to prevent the arm from slipping off when it is fully extended, it was necessary to crimp after assembling the arm. The present invention does not require gears, has a low contraction length, maintains a high lift ratio function, and can be made compact.Also, when assembling the arm, by adding an angle phase to a part of the arm shape, The purpose of the invention is to provide a pantograph jack that can prevent the arms from coming off during extension and that has a minimum number of parts.

[0004]

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art. The gist of the present invention is that four types of arms are pivotally attached to each other in a quadrilateral shape. In a pantograph jack constituted by a rod-chain link mechanism, both lower arms are made up of inner and outer lower folding arms and one upper arm of an overhang mechanism in which the folding portions are extended from the pivot pins by return arms. The return arm of the load receiving part is formed as the inner upper folding arm of the overhang mechanism in which the side of the folding part is extended from the pivot pin, and female screws or bearings for screw rods are respectively engaged and pivoted on the upper and lower arms. Each has a slant notch
A pantograph jack in which the arm is prevented from coming off at the time of maximum extension and is attached so as to prevent the arm from coming off.

The present invention will now be described in detail with reference to the following embodiments with reference to the drawings. First, according to the present invention, in a pantograph jack constituted by a four-bar chain link mechanism in which four kinds of arms are pivotally attached to each other in a quadrilateral shape, the right and left lower arms are respectively returned arms by the return portions 1c and 2c. Of the overhang mechanism extended from the pivot pin 3, the outer lower folding arms 1 and 2 are formed, and one (left) upper arm is the return arm to form the load receiving portion 5, and the folding portion 4c side is the pivot pin 13 side. It is the inner upper folding arm 4 of the overhang mechanism extended further. 1
a and 1b are arm plates of the inner and lower folding arms 1, and 2
a and 2b are arm plates of the outer lower folding arm 2 and further 4
Reference numerals a and 4b are arm plates of the inner upper folding arm 4. Reference numeral 6 denotes an upper support arm composed of two arm plates 6a and 6b each having one end pivotally attached to the inner upper folding arm 4 by a pivot pin 13. And, each of the upper and lower arms 1, 6, 2, 4 is provided with an inclined notch 7, 8, 10, 11 for engaging and pivoting a female screw or a bearing 9, 12 for the threaded rod 14 respectively, and a pantograph is provided. When the jack is fully extended, the arm is prevented from coming off, and the jack is attached so as not to come off. Reference numeral 15 is a handle joint, and 16 is a fitting hole.

[0006]

EFFECTS OF THE INVENTION In the pantograph jack of the present invention, the conventional arm, the top arm holder and the bed can be used in common by using the U-shaped folded arm structure, and the number of parts can be reduced. Further, since it has a structurally high rigidity, it does not require an arm collar, and therefore contributes to weight reduction, and it is easy to assemble and the assembly cycle is shortened. Moreover, the use of an overhang mechanism eliminates the need for a fall prevention gear and has the advantage that the fulcrums of the arms can be shortened, so it can be made extremely compact. Further, by providing the arm with the angle of the inclined cut, it is possible to prevent the arm from coming off when the jack is fully extended even after the assembling without caulking. Incidentally, the difference in the number of parts between the current basic jack and the jack using the return arm of the present invention is about 20 points for the current basic jack and about 10 points for the present jack, which is about half the number of parts.

[Brief description of drawings]

FIG. 1 is a perspective view of a pantograph jack of the present invention.

FIG. 2 is a front view of the pantograph jack of the present invention when it is extended.

FIG. 3 is a front view of the proposed pantograph jack at the time of contraction.

[Explanation of symbols]

 1,2,4 Folding arm 1a, 1b, 2a, 2b, 4a, 4b, 6a, 6b Arm plate 1c, 2c, 4c Folding part 3,13 Pivoting pin 5 Load receiving part 6 Vertical support arm 7,8,10, 11 Inclined cut 9,12 Female thread or bearing 14 Threaded rod 15 Handle joint 16 Fitting hole

Claims (1)

[Scope of utility model registration request] In a pantograph jack constituted by a four-bar chain link mechanism in which four kinds of arms are pivotally attached to each other in a quadrilateral shape, both lower arms are respectively provided as return arms, and the folding portions 1c, 2c side are extended from the pivot pin 3 In the overhang mechanism, the outer lower folding arms 1 and 2 are formed, and the upper arm of one side is formed by the return arm to form the load receiving portion 5 and the folding portion 4c side is extended from the pivot pin 13 in the overhang mechanism. The upper folding arm 4 is not provided, and the upper and lower arms are provided with slant notches 7, 8, 10 and 11 for respectively engaging and supporting the female threads or the bearings 9 and 12 for the threaded rod 14 respectively, and the arm at the time of maximum extension. A pantograph jack that is prevented from coming off and is attached so that it does not come off.