JPS58177896A - Support lever for pantagraph type jack - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an end configuration of four support rods that constitute a rhombic link structure of a pantograph jack.

As is well known, a pantograph type jack consists of five main parts: two upper support rods, two lower support rods, a spiral rod, a grounding board, and a pressure plate, as well as other accessory parts such as bearings and shafts. It is configured.

When operating a pantograph jack made up of the above-mentioned parts, it is necessary to raise the pressure plate while maintaining it parallel to the ground base plate, and to ensure that the left and right support rods always rotate at symmetrical angles. A gear-shaped portion is formed in which the lower ends of the lower support rod and the upper ends of the upper support rod are engaged with each other, which are respectively supported by a bearing portion connected to the ground substrate and a bearing portion connected to the pressure receiving plate. Various manufacturing methods and shapes have been developed, mainly cold forging, as a means of forming the gear-shaped portion at one end of each support rod. However, the gear shape, which is its main form, is universal and requires high precision during manufacturing. As mentioned above, the quick manufacturing method is K, and most of them are cold forged, which forces the meshing teeth forming part to undergo harsh processing, resulting in changes in the material, improving accuracy, strength, and wear and fire resistance. The value of satisfaction in terms of degree will decrease.

This invention completely eliminates the conventional gear-shaped meshing relationship as a means of contact transfer between one end of each support rod and the end of an adjacent support rod via a bearing, and this contact transfer The object of this invention is to have a cam contact structure in the means.

Next, as a prelude to a detailed explanation of the present invention, the panmegraph type jack containing the main parts of the invention will be explained in its entirety.

The bearing part (2) K connected to the grounding board (1) has a shaft hole (
41 (5) The lower end of the K lower support rod (7) ('I) is supported by the shaft all aml, and the pressure receiving plate (3) that comes into contact with the bottom of the car is provided in the bearing part (2) connected to the K. Shaft hole (4
) (!5) K upper support rod (6) The upper end of (6) is pivotally connected to the shaft auab, and each upper support rod (6)
The lower end of the lower support rod (7) and the upper end of the lower support rod (7) are coaxially pivotally connected to both sides of the bearing member 00 by the pin (13).
A bearing hole K is bored in a direction perpendicular to the axial direction of the bottle Q2 which is engaged with the bottle Q2.

The unthreaded part of the end of the operating rod I is rotatably supported, and the lower end of the other upper support rod (6), which is different from the upper support rod (6) and lower support rod (7), and the lower Support rod (
i) The upper end is screwed into a male screw part a provided on the operating rod α4, and the actuating rod α moves forward and backward by rotation of the operating rod α4.
In a pantograph jack equipped with an Ih bearing 09, pivoted with a pin 03, and provided with a rotary motion transmitting portion flGK provided at one end of an operating rod 04, a shaft till is provided at each bearing portion (2). This relates to the contact transfer portion of the upper support rod (6) (tj) and lower support rod (7) (e) which are pivotally connected at (11).

In the bearing part (2), which will be described in detail below, both the grounding board (on the side) and the pressure receiving part (3) and the pressure receiving part (3) are referred to simply as the bearing part (2) because they have the same structure and the same function. In addition, the upper support rod +e+ (j+ and the lower support rod (7) (
In i), the technical idea of the main part is single, so they are collectively referred to simply as the support rod (8), but the adjacent support rods corresponding to the ecological explanation are designated by the symbol (8).
) to explain.

The normal rotation angle of the support rod (8) described below is from about 10 degrees to about 80 degrees (from 190 degrees to 260 degrees) when the ground base plate (11) and pressure receiving part (3) are basically in a horizontal state. ), and even if you expand this and look at the maximum angle, it is from 0 degrees to 90 degrees (from 180 degrees to 270 degrees).
degree), and therefore the pin hole (9) through which the axis aυui+ at the -blade end of the support rod (8) is inserted (9)
The shaft is formed on the end side of the support rod (8) at an angle perpendicular to the longitudinal direction of the support rod (8). part becomes the cam part aη, and both cam parts αηα
When D is in contact with each other, the sum of the lengths of both cam parts an and an is the straight line II that connects the two minute points of the axis aDnb.
It is important to make the distance (j) h of (a) equal.

The shape of this cam IIa sword is a modified elliptical semi-recess consisting of a short radius and a long half-shape from the hole center of the bottle hole (9) into which the shaft (Ill (including the axis aυ)) is inserted in the support rod (8). The cam side (181) is formed by the circular arc line, and the length of the semi-major axis is made shorter than the straight line (181).

The cam side (181) as described above is formed on either the left or right end side of one support rod (8), and the opposite end side has exactly the same shape as the cam side 0υ formed above. The cam side part is formed by inverting the shape of 1.
In the book support rod (8), the shapes of the left and right cam sides (la) are different, and the radius forming the cam sides α& at the same position on both cam sides Although the radii of all the cam side O sand arcs are not the same, the length of the sum of the distances of these different radii is (
The distance 111 (tl) between the axes of the shaft holes (4) (including locations with the same radius) is formed to be exactly the same as the distance 111 (tl).

This means that in the bearing part (2), two support rods +8
) (j+ is the cam side α&
are brought into contact and joined, so the distance (11
When looking at the intermediate position as a reference, the cam part Qn on one side protrudes by an unspecified dimension from the intermediate reference position, and the cam part Q7+ on the other side protrudes from the intermediate reference position by the protruding dimension of the opposing cam 5a71. If the cam portions 071 of the two supporting rods (8) of the same configuration are brought together, the excess or deficiency distance will be canceled out with respect to the intermediate reference position, and the cam sides of both cam portions aD (contact at 181) will be offset. The sum of the radial distances of the locations is exactly the same as the distance (1), and this distance relationship is configured to be the same across all sides of the cam in the cam portion On.

The above description is about forming the cam part 0η at the -blade end of the support rod (8) in the cam part 0η configuration. 8) - It is optional to configure a support rod (8) fixedly connected to the blade end and having a cam portion Q71 at the tip.

As described above, this invention has two support rods (8) (8)
is supported by one bearing part (2), and both support rods (8) <
8) It is characterized by using a cam mechanism in the ridge contact part in order to join the tips and make them contact and roll.The cam structure allows both cams to slide using the well-known "rolling friction". This is to prevent this phenomenon from occurring. Unlike the contact between perfectly circular rollers, this contact rolling member uses the already established rolling friction effect in the contact rolling by a cam.

Even in this cam contact, if we look at the effect of only the cam contact on the - side with respect to the average load applied to both support rods +s) (8), the curvature of each cam side in contact is different, so Although there is no average rolling friction and there may be an uneven load on one of the cams, inverted cams are provided on both sides of the support rod (8) and the cams are joined together.

In other words, in a symmetrically reversed cam joint, the unbalanced load that may occur on one cam joint is canceled out by the symmetrical cam joint, so both support rods (8) ts'+ become an average load and always slide. It is a 5K model that can exhibit rolling friction without any phenomenon.

In this way, both support rods (8) (8) are rotated at the same rate by contact rolling of the cam, which is similar to the conventional meshing rotation of gear-like members. Since there are no errors due to line gaps, wear phenomena similar to wear of each tooth body due to meshing rolling are eliminated. Furthermore, due to the above structure, there is no distinction between left and right in the single support rod (81 (8)), and there is an advantage that the same type of rod can be assembled.
! The cam structure can be formed by a method equivalent to a single press, so unlike the manufacturing process of a gear-shaped body, it can be easily constructed. It also has the advantage that there is no risk of change. In this way, the cam structure is easier to use than conventional support rods, has a lower wear rate, and is safer to use.
Furthermore, it has the feature that it can be provided at low cost.

[Brief explanation of drawings]

Figure 1 is an overall side view of the pantograph jack, Figure 2 is a vertical sectional view of the main parts, Figure 3 is a plan view of the main parts, Figure 4 is a side view showing one end of the support rod, and Figure 5. is a longitudinal cross-sectional view of the bearing portion. (1)...Grounding board, (2)...Bearing part, (3)...Pressure receiving part, (4), (5)-11 is hole, t8) (8)"
”l'l rod, uan-・shaft, αη・cam part, 1 set・
・Cam side. Patent applicant: 1 person other than Ruken Kaki Kogyo Co., Ltd. 1111 Figure 1 Figure 2 vSa Figure 4

Claims (1)

[Claims] The shafts are inserted into both sides of the ends of the four supporting rods having a U-shaped cross section that make up the diamond-shaped link structure of the pantograph jack, and which are pivotally connected to each of the bearing parts of the grounding board and the bearing parts connected to the pressure receiving plate. A cam side of an arc consisting of a short axis and a long axis is formed with the shaft hole as the center, and when the support rod is pivoted to the bearing part, it comes into contact with the cam side provided at the opposite end of the support rod. A support rod of an intagraph type jack, characterized in that both support rods can be moved in contact with each other at the same rotation rate by rolling friction.