JPS5889593A - Pantagraph type jack for automobile - 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 is for automatic 1 [Bantagraphno 1! ! This relates to an improvement to the jack, and involves a modification to the gear retaining part of the lower arm of the two pieces of wood supported on the pedestal.

As is well known, most of the automobile gearboxes are of the pantograph type as shown in Figure 1, and are used for 1M, which is equipped with an upper loading platform (1). Bank graph between both (2) and the lower pedestal (3), and the left and right screw rod holders (4) and (5)! (l!) The first arm (6) (7) and the lower arm (8) (Q) are rotatably supported, and the threaded rod (It ) is inserted into the 4'//? structure.

The lower arm (8) (tl
) without wobbling, and when the loading platform is used to jerk up the car body by applying liquid to the car body, it must be able to withstand the unbalanced load caused by the tilt of the car body. 411 (Various improvements have been made. In order to prevent the front sound A-J from wobbling, place the lower arm (8) on the pedestal (3).
tl) is supported by two lower connecting pins (11) (+9), and the lower ends of the lower arms are interlocked with each other between the teeth ll(), which has already been put into practical use.l-
However, it is not possible to deal with the latter unbalanced load by simply meshing gears, so it is necessary to calculate the unbalance in advance and change the arm length, gear ratio, or lower connecting bin. Efforts have been made to absorb the uneven stress caused by the inclination of the jack by using a long support on one side of the jack.11 However, the inclination of the car body when the jack is up depends on factors such as vehicle height, road surface conditions, and the installation position of the jack. The present invention solves the above-mentioned drawbacks.The present invention solves the above-mentioned drawbacks. This was obtained as a result of various studies, and the gist of the study was to change the shape of the gear in the gear retaining part of the lower arm or the pin receiving hole of the lower connecting pin, and to Under normal conditions, the gears maintain a normal meshing state, but when an unbalanced load is applied to jack up the vehicle body, the meshing between the gears disengages or becomes loose, resulting in large play.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

First, we will explain examples in which the shape of the teeth if has been devised.As shown in Figure 2, there is a combination of spur gears with a length of 1m, and as shown in Figure 3, a gearless part is provided at the top of the gear part. Examples include gears with different sizes of pack bushes, or gears with different sizes of pack bushes.

The first example is shown in Figure 2, where the lower arm (8)
(9) Tooth 1 (slanted spur gear Sakaki α→
When a certain amount of skin contact force is applied to this gear, a force is generated in the direction shown by the arrow, and the gears are held elastically against the side of the lower arm from the thrust direction so that they may rattle or come off. It is a structure.

Inclined spur tooth +11 (+:) (The shape of +4 may seem complicated at first glance, but it is relatively simple as it can be press molded or resin molded.

The second example is shown in Fig. 3, where the bank graph is lower and the upper arm and lower arm are close to each other. The locking gear part is set at 0 o'clock, and the part in the unbalanced load state after contact is set to a toothless part with no locking at 00.Depending on the type of car, the body and the ground are different from each other. Although the distance varies, the height at which the jack loading platform contacts the vehicle body and an unbalanced load begins to be applied is approximately 200 υ.Therefore, the gear portion αυ00 with no play in the no-load state up to that height. By maintaining this, the jack can be stably increased, and when more unbalanced loads are applied, the gearless parts a, Q, and the like, where there are no gears, are formed, and the jack can be smoothly tilted along the inclination of the body. This made it possible to do so.

In the sixth example, unlike the second example, the gear part and the non-gear part are not clearly separated and illustration is omitted, but the gear part engaged in the no-load state is held in an unevenly loaded state. This is a structure in which the diameter of the gear is made smaller toward the desired gear part, or the teeth themselves are made smaller. In other words, the gear provided at the lower end of the lower arm has normal metal teeth in the unloaded state to prevent the arm from wobbling, and in an unbalanced load state where the jack's loading platform contacts the car body and an uneven load is applied to the jack arm, the gear will not move when the jack is in an unloaded state. As a large retaining tooth, the object of the present invention is achieved.

The following three examples are all unique in the shape of the gear, but in the next example, the tooth i1 of the lower arm (part connecting bottle (+1) This is shown in Figure 4 as a fourth example, in which there are two elongated V-shaped holes that open downward on the pedestal (3). (J) supports the lower connecting bin (1υ (1 frame), and the lower arm (8) (9) is sticky x<u
t', that is, in the no-load state, the connecting pin comes to the two parts of the V-shaped elongated hole as shown by (-), and the gears mesh, and when the lower arm is in the upright state, where the load is applied, as shown in Fig. 4 (b). ), the connecting pin comes to the bottom of the elongated hole and the gears disengage, allowing the left and right lower arms to operate independently.

Such engagement and disengagement of the gear part, fP, even if it does not depend on the C-shaped elongated hole (a) σ of the 4 examples, the @ 5 examples can be either A structure in which the gear part is provided with a long shaft whose major axis is the diameter of the hole, and the tension coil μ spring (211) is used to engage the gear works similarly. In this case, unlike the fourth example, the tension coil spring 211 is not a necessary member. Become.

If the pitch of the gears in gear part Q~ is selected so that when the jack is used under normal conditions, even if the gears become misaligned, they will not mesh with the next gear, and when the jack is returned to its original position, the gears will mesh properly. Return to original position. However, in the case of abnormal use, that is, if the gears are completely out of mesh and the angle of inclination of the lower arm becomes large, the gears may shift by one peak when the gears return to mesh. In such a case, in order to automatically return to the original state when the lower arm descends, protrusions @ (c) are provided on both sides of the pedestal (3) as shown in Figure 6 (a). Either support the arm (8) (9) from below and correct the meshing of the gear part (1G), or as shown in Figure 6 (b), in addition to the pedestal convex part (c), attach the lower arm to the lower arm side. A similar correction is made by providing a convex portion ■■.

Since the present invention has the structure described in detail above, stable vertical movement during no load is guaranteed by relatively simple modification of the gear part, and damage to the jack due to unbalanced load during load can be prevented. , no more strength than necessary is required,
This has had the effect of reducing the weight and cost of the jack.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view, Figs. 2 to 5 are embodiment views showing the structure of the gear retaining part of the lower arm, and Fig. 2 is a perspective view of the tooth 4.
3-4(a), (b) and FIG. 5 are side views. FIG. 6(a) (11) is a plan view showing a convex portion of a stopper for returning gears to meshing and maintaining. (1) Loading platform <2) 1 part A person mounting bracket (3) Pedestal (4), (5)
Threaded rod holder ((1), (7) - 1 part arm
(Kaya)), (9) Lower arm 0O threaded rod
(1υ, (1 k) Lower connecting pin H, (l) Inclined tooth spur gear OQ Tooth it part 00 Gearless part
0η Partial gear...Convex shaped pedestal long hole t211 Tension coil spring hole Stud hole (to) Leaf spring or more

Claims (1)

[Scope of Claims] In a jack comprising a pantograph-shaped upper arm, two lower arms, and a threaded rod made of 12 wood, the lower arm is gear-engaged with the base of the jack, in which the lower end of the lower arm The meshing portion between the provided gears maintains a normal meshing state in the unloaded state until the loading platform contacts the automobile body, and in the unevenly loaded state after contact, the meshing between the gears may become disengaged or Automotive pantograph type jack 2 formed to have a large play.The gear provided at the lower end of the lower arm is a mesh of inclined tooth spur gears inclined in the axial direction, and the gear is attached to the side surface of the lower arm in the thrust direction. A pantograph-type jack for an automobile according to claim 1, wherein the jack is held under pressure. 3. The gear provided at the lower end of the lower arm is a partial gear that engages only in the unloaded state, and is non-geared and non-coupled in the unbalanced load region after contact. Pantograph type jack for automobiles. 4. The gear provided at the lower end of the lower arm has normal retaining teeth in the unloaded state, and retaining teeth with large backlash in the portion t''ni in the unbalanced load state after contact. Pantograph-type jack for automobiles according to item 1. 5. The gear provided at the lower end of the lower arm supports the lower connecting pin with a V-shaped elongated hole provided in the pedestal that opens downwards, and uses the jack's own weight or elastic force to support the lower connecting pin. The pan tag hook-type jack for an automobile according to claim 1, which is meshed and engaged.6 The gear provided at the lower end of the lower arm is formed by a rectangular elongated hole provided on the gear side or a long diameter of the elongated hole. A pantograph-type jack for an automobile according to claim 1, which has a hollow hole having a diameter of , is supported on a base by a lower connecting pin, and is meshed and engaged by the jack's own weight or elastic force.