JPH028200A - Vertical lift jack - Google Patents

Abstract

PURPOSE:To facilitate the change of direction while under moving by fixing equally the distances from a supporting shaft to a fixed shaft, sliding shaft and pivot and fixing the both bottom angles of a down isosceles triangle formed by the supporting shaft, sliding shaft and pivot equally with the inclination to the floor face of a guide groove. CONSTITUTION:The distances from a supporting shaft 11 to a fixed shaft 9, sliding shaft 12 and pivot 19 are equally fixed and the both bottom angles of a down isosceles triangle formed by the supporting shaft 11, sliding shaft 12 and pivot 19 are fixed equally with the inclination to the floor face 2 of a guide groove 13. Now, a supporting arm 8 is rocked upward by extending a hydraulic cylinder 16. So the step 18 of bearing pivotally provided at the front end of a swing arm 10 is vertically ascended against a floor face 2 with holding its level and the load applied thereon is charged with a front wheel 3 and grounding base 7 being earthed on the floor face 2. A rear wheel 4 is provided at the center of a frame 1 and the change of direction while under moving is facilitated because the lower face 1a of the frame 1 is inclined rear upward from the vicinity of the rear wheel 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a jack used, for example, in inspection and repair of automobiles.

[Conventional technology]

The jacks used to lift the front or rear wheels of a car for repairing the car's tire bank, etc., are placed below the car body where the support for supporting the axle is low and the height of the jack is low. It is necessary to have scales that allow the wheel to be inserted as vertically as possible.

Various types of jackals that meet these demands are disclosed, for example, in Japanese Patent Publication No. 55-16960 and Japanese Patent Application Laid-Open No. 55-8479.
It is described in Japanese Utility Model Publication No. 8, Japanese Utility Model Application Publication No. 59-26496, and Japanese Utility Model Application Publication No. 59-173697.

[Problem to be solved by the invention]

The one described in Japanese Patent Publication No. 55-16960 is a Scott Russell type in which the loading platform rises and falls vertically, but the lower rear end of the main arm and the lower front end of the auxiliary arm must be at the same height from the floor. Therefore, there is no problem if it is a stationary type, but
If wheels were installed in the front and center to make it mobile, the rear of the jack would be close to the floor, making it difficult to lift the front wheels when changing direction mid-movement. .

To avoid this, increasing the distance between the jack and the floor will increase the height of the jack, and if the rear wheel is placed at the rear end of the jack, the front will be significantly heavier than the rear wheel, which will also cause the front wheel to float. Operation becomes difficult.

Swivel wheels make it easier to change directions.

It becomes complicated, large and expensive.

The device described in Japanese Patent Application Laid-open No. 55-84798 is not a Scott Russell type, and in order to raise and lower the receiving plate approximately vertically, the swinging rod (main arm) needs to be long. Since a large number of rods and pivot points are used, the structure is complicated, and if you want to make the jack strong, the rods etc. need to be made strong, making the jack large.

Further, since the hydraulic cylinder is installed vertically, the height of the jack is high, and in order to reduce this height as much as possible, if the hydraulic cylinder is installed at the rear, a powerful hydraulic cylinder will be required.

Moreover, like the one described in Japanese Patent Publication No. 55-16960, it is difficult to change direction during movement.

The device described in Japanese Utility Model Application Publication No. 59-26496 is similar to the Scott Russell type, but the rear lower end of the first swing arm moves along a slightly inclined guide groove together with the rear lower end of the second swing arm. Therefore, the receiver at the front upper end of the first swing arm moves up and down vertically by 1°, and since the hydraulic cylinder is installed vertically, there is the same problem with the height of the jack as described above.

Since the lower surface of the jack is close to the floor surface up to the rear, there is a problem similar to that described above when changing direction during movement.

The device described in Japanese Utility Model Application Publication No. 59-173697 is of the Scott Russell type, and the receiver moves up and down vertically, but a sub-arm of the same length as the main arm is provided below the main arm.
The rear part of the lower surface of the base is also close to the floor surface, and there is a problem similar to that described above when changing direction during movement.

[Means to solve the problem]

In the present invention, a support arm facing rearward is pivotally mounted with a fixed shaft on the front lower part of an underframe that can freely move forward and backward, and the rear end is pivotally attached with a support shaft to the central lower part of a swing arm facing forward and backward. The rear end of the swing arm is engaged with a guide groove facing in the direction of the stationary shaft provided on the inner surface of the underframe so as to be slidable back and forth with a sliding shaft, and the rear end of the swing arm is inserted through the rear upper end of the support arm. , a hydraulic cylinder is provided between the driving shaft located above the straight line connecting the fixed shaft and the sliding shaft, and the sliding shaft, and the support is pivoted on the front end of the swing arm with a pivot. By setting the distances between the sliding axis and the pivot axis equally, and setting both base angles of the downward isosceles triangle formed by the support axis, sliding axis, and pivot axis to be equal to the inclination angle of the guide groove with respect to the floor surface, This is an attempt to solve the above-mentioned problems.

In addition to the above configuration, the present invention further provides that the height of the sliding shaft from the floor surface is made higher than the support shaft, and the lower surface of the underframe is inclined rearward and upward from near the support shaft. Providing a rear wheel near the axle provides a vertical lift jack with an added configuration.

[For production]

Since the jack of the present invention applies a Scott Russell type mechanism, the support is vertically raised and lowered by the expansion and contraction of the hydraulic cylinder. Furthermore, when not in use, all the arms and hydraulic cylinders are almost horizontal, overlapping each other from side to side, so the height of the jack is significantly reduced.

In addition, when not in use, the sliding axis of the swing arm is located above the support shaft, so the bottom surface of the underframe can be tilted rearward and upward from below the support shaft, which is approximately in the center of the underframe. If a rear wheel for running is provided approximately in the center of the frame, the front part of the underframe can be easily raised above the floor surface, making it easy to change direction during movement.

〔Example〕

1 to 3 show an embodiment of the present invention,
A small-diameter front shaft (3) and a large-diameter rear wheel (4) are pivotally installed at the front (right side of the drawing) and rear of the underframe (1), respectively, for running on the floor (2). , the lower surface (1a) of the underframe (1) is
It is inclined rearward and upward from near the rear wheel (4).

At the rear end of the underframe (1), the lower end of a moving handle (5) is pivotally attached with a horizontal axis (6), and at the front end, a grounding platform (7) is also provided extending forward. Inside the front end of the underframe (1), two pairs of left and right support arms (8) facing rearward are pivotally mounted with immovable shafts (9) (the immovable shaft at the bottom in FIG. 1 is not shown).

At the rear lower part of each support arm (8), a support shaft (
11).

Both swing arms (10) (10) forming a pair of left and right swing arms (10)
) are connected to each other by sliding shafts (12), and the outer ends of each sliding shaft (12) are attached to the fixed shafts attached to the inner surfaces of both side plates (1b) of the underframe (1). (9) Tilt forward and downward toward the direction. Horizontal U-shaped guide groove (13)
is engaged in.

It passes through an arcuate hole (14) that extends above each sliding shaft (12) and the support shaft (11) of each support arm (8) and protrudes from the swing arm (10). A hydraulic cylinder (16) is provided between each drive shaft (15),
Both hydraulic cylinders (16) (16) are expanded and contracted by a hydraulic pump (17) placed at the rear of one frame (1).

A support (18) is supported with a pivot (19) at the front end of each swing arm (10), and a bracket (20) facing rearward and upward connected to the rear surface of the support (18) has a support for the swing arm. (10) Auxiliary arm (
The front end of 21) is pivoted with a horizontal pin (22),
The rear end of the auxiliary arm (21) is a swing arm (lO).
A horizontal pin (24) passing through an arcuate hole (23) drilled in the
The support arm (8) is pivotally connected to the rear and upper part of the support shaft (11).

Fixed shaft (9) and sliding shaft (12) from the above support shaft (11)
The distance between the support axis (19) and the support axis (19) are set equal.
11), the sliding shaft (12), and the pivot shaft (19), both base angles of the downward isosceles triangle form the floor surface (2) of the guide groove (13).
) is determined to be equal to the inclination angle.

In the above-described jack of the present invention, when the hydraulic cylinder (16) is extended, the support arm (8), whose front end is pivotally connected to the underframe (1) by the immovable shaft (9), can be moved by the drive shaft (15). Since it is located above the straight line connecting the stationary shaft (9) and the sliding shaft (12), it swings upward.

Therefore, the central part holds the support shaft (11) and the support arm (
8), the sliding shaft (12) at the rear end slides forward in the guide groove (13).
The receiver (18), whose front end swings upwards and is pivoted at the front end of the swing arm (10), remains almost horizontal due to the action of the auxiliary arm (21), and as will be described later, (
2), and the load applied to the support (18) is borne by the front shaft (3) and the ground platform (7), which are in contact with the floor surface (2).

If the hydraulic cylinder (16) is shortened, the upwardly inclined members operate in the opposite manner to the above, descending, and become horizontal so as to overlap left and right, so that the height of the jack becomes significantly lower than that of the conventional one.

In addition, the rear wheel (4) is provided approximately in the center of the underframe (1), and the lower surface (1a) of the underframe (1) is inclined rearward and upward from the vicinity of the rear wheel (4). The front part of the jack when not in use can be easily floated above the floor (2), making it easy to change direction during movement.

Next, the reason why the jackpot (18) rises and falls vertically is as follows.
FIG. 4 will be explained. Note that MN in the figure is a horizontal line passing through the stationary shaft (9) and the sliding shaft (12), respectively.

In the same figure, the horizontal distance between axes (12) and (19) is L
The horizontal distances between axes (9) and (12), between axes (9) and (11), and between axes (12) and (11) are L2 and ρ, respectively.
0, I22, then L1= 2 Q 0 cos α'
cos(θ-α)L, II□+Q = fl(cosθ+cos(e-2a)".

= fl 2- 〇O5(0-α) heat cos α
=2Q 1ICO8α1CO8(θ-α), and L1=2 at all times, so it goes up and down directly.

The receiver (15) is vertical. [Effects of the Invention] In the jack of the present invention, when the hydraulic cylinder is expanded and contracted, the swing arm swings up and down together with the support arm, and the receiver at the front end vertically moves up and down. Can lift cars, etc.

Also, when not in use, all the arms and hydraulic cylinders are horizontal so that they overlap left and right, so the height of the jack is lower than that of conventional models.

Furthermore, since the sliding axis of the swing arm located at the rear of the jack is located above the support shaft in the center, the lower surface of the jack is inclined toward the rear ball rather than near the support shaft, and If rear wheels are installed on the jack, the front part of the jack can be easily raised above the floor, making it easy to change direction while moving.

Since the jack of the present invention has such characteristics, it is particularly convenient to use when inspecting and repairing automobiles.

[Brief Description of the Drawings] Fig. 1 is a plan view showing an embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
1 is a cross-sectional view taken along the line A-A, FIG. 3 is a side view schematically showing the main parts of the jack of the present invention in use, and FIG. It is a line diagram corresponding to . (1) Underframe (1b) Side plate (3) Front shaft (5) Handle (7) Grounding platform (9) Fixed shaft (11) Support shaft (13) Guide groove (15) Drive shaft (17) Hydraulic pump (19) ) Pivot (21) Auxiliary arm (la) Lower surface (2) Floor surface (4) Rear wheel (6) Horizontal shaft (8) Support arm (10) Swing arm (12) Sliding shaft (14) Arc-shaped groove (16) Hydraulic cylinder (18) Receiver (20) Bracket (22) Horizontal pin

Claims (2)

[Claims] (1) A support arm facing rearward is pivotally mounted with a fixed shaft on the front lower part of the underframe that can freely move forward and backward, and the rear end is pivotally connected with the support shaft to the lower center of the swing arm facing forward and backward, The rear end of the swing arm is provided on the inside surface of the underframe.
The drive shaft is engaged with the guide groove facing the stationary shaft so as to be slidable back and forth with a sliding shaft, and is located above the straight line connecting the stationary shaft and the sliding shaft, and is installed through the rear upper end of the support arm. A hydraulic cylinder is provided between the front end of the swing arm and the sliding shaft, and the support is pivotally supported at the front end of the swing arm. A vertical lifting jack characterized in that both base angles of the downward isosceles triangle formed by the sliding shaft and the pivot are set equal to the inclination angle of the guide groove with respect to the floor surface. (2) The height of the sliding shaft from the floor is higher than the support shaft,
A claim in which the lower surface of the underframe is inclined rearward and upward from near the support shaft, and a rear wheel is provided near the support shaft (
The vertical lifting jack described in 1).