JPH01308395A - Hydraulic jack - Google Patents

Abstract

PURPOSE:To prevent any load from being imposed on a horizontal adjusting driving cylinder installed between a cylinder and a truck base and its mounting part and thereby keep off the damage and deformation by supporting the truck base with the cylinder and legs via a sliding member. CONSTITUTION:Each of sliding members 50, 52 consists of a frame body provided with a plate at the bottom part, a sliding frame inserted into this frame body free of slide motion as engaging this body, a slider inserted into this sliding frame free of slide motion as engaging this frame and a bracket standing erect on this slider. A frame body of this sliding member is clamped to the side of a truck 8, a cylinder 9 and legs 15, 17 are clamped to the bracket in advance, and when pressure in vertical adjusting driving cylinder is exhausted, a truck base is supported by the cylinder and these legs via the sliding members, preventing this base from going down. In consequence, no load is added to horizontal adjusting driving cylinders 48, 49 installed between the cylinder and the base and their mounting parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic jack used for raising or lowering a heavy object, such as the underwing of an airplane.

[Conventional technology]

2. Description of the Related Art A hydraulic jack shown in FIG. 6, for example, has been developed as a hydraulic jack for raising and lowering a relatively large structurally heavy object, such as the wing of an airplane.

A ram 3 is inserted into the cylinder l via a piston 2 so as to be able to move up and down, three legs 5 are connected to the upper part of the cylinder l via a bracket 4, and casters 6 are attached to the lower part of each leg 5. A spring 7 is interposed between the caster 6 and the leg 5 to bias the leg 5 upward.

When lifting a heavy object, transport the entire hydraulic jack below the load support point via the caster 6, and then move the caster slightly in the right angle direction using input or lever to position the ram at the jack point. ing.

When the ground on which the leg 5 is to be grounded is sloped or uneven, the leg 5 is expanded and contracted each time to adjust its length and make fine adjustments so that the ram 3 stands vertically.

After adjusting the horizontal and vertical directions of the cylinder 2 and ram 3 with respect to the jacking point in this way, the ram 3 is extended to push up the heavy object. On the other hand, when the ram 3 is lowered, it is lowered to a position where the load of heavy objects does not act on the ram 3. At this time, the leg 5 and the cylinder 2 float due to the return force of the spring 7, and in this state, the leg 5 is manually compressed to complete the work.

With the above-mentioned hydraulic jack, when aligning the jack point of the load support part of a heavy object, the entire hydraulic jack is moved horizontally via casters manually or with a lever, so alignment is troublesome. The problem is that the larger the hydraulic jack, the more labor it takes and the lower the work efficiency. Therefore, a hydraulic jack was developed that allows easy and accurate horizontal and vertical adjustment of the jacking point of the hydraulic jack, and can significantly improve work efficiency (Japanese Patent Application No. 112776/1982).

The configuration of this hydraulic jack is such that the main body of the hydraulic jack is floatingly disposed on a truck, two horizontal drive cylinders are provided between the truck and the cylinder, and a drive cylinder for vertical adjustment is provided at the bottom of the truck. In addition, a support member for supporting the base is provided on the cylinder to prevent the base from descending.

As shown in Figure 5, the lower part of the hydraulic cylinder 9 protrudes downward through a central hole 81 of the base 20, and a support member 80 is extended from this lower part to support the base 20 with the support member 80. .

A hydraulic jack is installed at the load support point, and the drive cylinder 74
When the pressure of the drive cylinder 75 is released, the base 20 tries to descend by its own weight by the amount that the drive cylinders 74 and 75 have contracted, but at this time, the support member 80 provided on the hydraulic cylinder 9 In order to support the lower surface of the base 20, the base 20 is ultimately held by the legs 15 and 17 via the hydraulic cylinder 9, and the base 20 does not descend any further.

For this reason, the attachment of the horizontal adjustment drive cylinder 48 is prevented from being bent or displaced.

[Problem to be solved by the invention]

However, the hydraulic jack shown in Figure 5 above requires a plate-shaped support member with a length that corresponds to the horizontal movable range of the hydraulic cylinder, which is difficult to install due to its structure, and limits the combination of connections with the trolley. This is disadvantageous for the eaves, and there is also the risk that dirt or other foreign matter may enter the sliding portion of the support member, causing malfunction.

Therefore, the present invention allows the support mechanism that supports the base to be made compact, easy to install and connect, and has strong strength.
To provide a hydraulic jack that can also prevent foreign matter from entering.

[Means to solve the problem]

To achieve the above object, the present invention has a configuration in which a ram is movably inserted into a cylinder floatingly disposed on a truck, a plurality of legs are provided on the cylinder, and a driving cylinder is connected between the cylinder and the truck. In a hydraulic jack in which the cylinder and the leg are connected to the truck via a slide member, the slide member has a frame with a plate on the bottom and engages with the frame within the frame. It consists of a slide frame that is slidably inserted while engaging with the slide frame, a slider that is slidably inserted into the slide frame while engaging with the slide frame, and a bracket that stands up on the slider, and fixes the frame to the trolley side. However, the cylinder and legs are fixed to the bracket.

[For production]

When the pressure of the vertical adjustment drive cylinder is released, the base tries to lower, but at this time the cylinder and leg support the base via the slide member.

〔Example〕

An example of the implementation of the present invention will be described below based on Figures 1 to 3.

A cylinder 9 stands up freely on the trolley 8, and the cylinder 9
A ram IO is vertically movably inserted into the hydraulic jack main body A.

A ring bracket 11 is connected to the upper outer periphery of the cylinder 9, and the upper base end of the tripod leg 15° 16. The lower portions of 16 and 17 are rotatably connected to the support base 19 via spherical bearings.

The trolley 8 includes a base 20, a pair of casters 23, 23 connected to the lower part of the base 20 via a bracket 21, an arm 22, and a drive cylinder 74 for the spear 3, and a bracket and a drive cylinder 75 for the spear 4 to the base 20. It consists of a lever (not shown) connected via can be moved to any position.

When moving the entire hydraulic jack to a desired position, the tripod legs 15, 16, and 17 are suspended from the ground blade 1 and placed at a predetermined position, for example, at the jacking point below the wing of a heavy airplane. When it comes, extend each leg 15, 16 and 17,
The support stand 19 is brought into contact with the ground, and this leg 15.16.17
It is designed to support the lower part of an airplane's wings.

The horizontal positioning mechanism is performed by moving the cylinder 9 on the carriage 8. This basic principle is illustrated in Figures 3 and 4.

Horizontal drive cylinders 48, 49 are provided on the base 20 of the truck 8, one cylinder 48 is arranged horizontally on the line X-X, and the other cylinder 49 is arranged horizontally on the line Y-Y. The two cylinders 48 and 49 are each connected to the cylinder 9 and have a positional relationship in which their extension lines are perpendicular to each other.

The base 20 is provided with three slide members 50, 51, 52, which are slidably connected to the slide members 50, 51, 52 of each leg 15, 16, 17' via brackets 53, 54, 55. has been done.

The hydraulic cylinder 9 and the legs 15, 16, 17 are floatingly arranged on the base 20 via slide members 50, 51, 52, so that when the drive cylinder 48 of the spear 1 is extended, for example in the X direction, Hydraulic cylinder 9 and each leg 15, 16.1
7 moves in the X direction, and when the drive cylinder 49 of the other arm 2 is extended, for example, in the Y direction, the hydraulic cylinder 9 and the legs 15, 16, -17 move in the Y direction.

When the drive cylinders 48 and 49 are driven at the same time, they move in the diagonal direction.

E1. Drive cylinders 48 and 49 of fang 2, respectively,
When compressed in the i direction, the hydraulic cylinder 9 and leg 15.
16.17 moves in the X and Y directions. For this purpose, by expanding and contracting the drive cylinders 48 and 49 of Fang 1 and Fang 2 each time with respect to the jerking point, the ram 10 of the hydraulic cylinder 9 is
The top of the can be accurately aligned with the bottom of the jacking point.

The slide members 50, 51, 52 are shown in Fig. 1 and Fig. 2 and have the same structure. Slide members 50, 51.
52 are arranged on the base 20 at equal intervals of, for example, 60 degrees. This slide member 50, 51, 52 consists of a hollow rectangular frame 60 with a stainless steel plate 60α on the bottom, and a hollow rectangular frame 60 that is slidably inserted into the frame 60 via bearings 61 and 62 at the end. A slide frame 63 serving as a guide, and a bearing 6 at the end inside the slide frame 63.
4.65, a plate-shaped slider 66 slidably inserted through a bearing 67 at the bottom, and a slider 66
A bracket 69 that stands upright and has a plurality of different orientations is provided with a hole 68.

Each bearing 61, 62, 64, 65, 67 is molded from a smooth material such as Teflon butt.

The frame body 60 is constructed by stacking horizontal frames 60C and 60C on a mouth-shaped frame 60b, and one frame 6
0b, the horizontal frame 60C, and the plate 60a are connected via bolts 75, and one bolt 75 is connected to the plate 60.
It passes through α and is fixed to the base 20 of the truck 8. The slide frame 63 engages with the lower gap 76 of the horizontal frame 60C060C.

Bearings 61 and 62 slidably abut against the frame 60b. The slide frame 63 is a vertical frame 6
3α is stacked on a horizontal frame 63A and connected with bolts 78. vertical frame 6
A gap 77 is provided below 3α, and the end of the slider 66 is slidably engaged within this gap 77.

Brackets 53.54 provided on each leg 15, 16.17
．． 55 is connected to the bracket 69 of each slide member 50, 51, 52 through a bolt inserted into a hole 68. Furthermore, a bracket connected to the cylinder 9 is also connected to each bracket 69 of said slide member 50, 51, 52. At this time, if the orientation of the slide parts 50, 51, 52 and the orientation of the legs 15, 16, 17 are displaced, one of the holes 68 is used for mounting corresponding to the orientation of the legs 15, 16, 17. It is bolted together. Hydraulic cylinder 9 and leg 15 by driving drive cylinders 48 and 49
．． 16°17 in the X-X direction or the Y-Y direction, and this movement is transmitted to the bracket 69 of the slide member 50°51.52 via the bracket 53, 54, 55 and the bracket on the cylinder side.

Moreover, since the slide members 50, 51.52 are connected to the base 2o of the trolley 8, the slide parts 50, 51.52
The cylinder 9 and the legs 15, 16, 17 are connected to the base 2'0 of the truck 8 via.

When the cylinder 9 and legs 15, 16, 17 move in the X direction, the slider 66 slides in the X direction while being guided by the slide frame 63, and when they move in the Y direction, the slider 66 becomes integral with the slide frame 63 and slides into the frame 6o. guided by Y
move in the direction.

Therefore, the amount of expansion and contraction of the drive cylinders 48 and 49 is selected as 9 and '7
'15, 16. When you push or pull 17, the slide frame 63
．． Alternatively, the slider 66 slides in the same direction to finely adjust the hydraulic cylinder 9 to an arbitrary position.

Note that a cover 79 fixed to the slide frame 63 is placed on the frame body 6o.
A cover 80 is also provided on the one-piece pocket 69. Due to the breakage, there is dirt inside the slide member 50, 51, 52.
Prevents foreign matter from entering.

〔Effect of the invention〕

According to the present invention, there is a first-order effect.

■Even if the pressure is released from the constantly moving cylinder for vertical adjustment, the base of the trolley will not fall because it is supported by the cylinder and legs via the sliding member, which allows for horizontal adjustment between the cylinder and the base. The drive cylinder and its mounting do not place any load on the parts, preventing damage or deformation.

■Since the frame of the slide member is connected to the base on the trolley side, the structure is compact and installation is easy, and there is no restriction on the 1m connection.

■There are usually three sliding members, and these three places support the base, making it strong and safe.

[Brief explanation of the drawing]

Figure 1 is a vertical front view of the slide member, Figure 2 is a plan view of Figure 1, Figure 3 is a schematic front view of the hydraulic jack, Figure 4 is a plan view of Figure 3, Figure 5 is a plan view of Figure 1, Figure 3 is a schematic front view of the hydraulic jack, Figure 4 is a plan view of Figure 3, Figure 5 is a plan view of Figure 1, Figure 3 is a schematic front view of the hydraulic jack. FIG. 6 is a schematic front view of a conventional hydraulic jack. 8...Dolly, 9...Cylinder, lo...Ram, 1
5.16.17・War Φ leg, 48.49... Drive cylinder, 50, 51.52... Slide member, 60...
・Frame body, 6oα...Plate, 63...Slide frame, 66...Slider, 69...Bracket. Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) A ram is movably inserted into a cylinder floatingly disposed on a truck, and the cylinder is provided with a plurality of legs,
In a hydraulic jack, a driving cylinder is connected between the cylinder and the truck, and the cylinder and the leg are connected to the truck via a slide member. It consists of a slide frame that is slidably inserted into the body while engaging with the frame, a slider that is slidably inserted into the slide frame while engaging with the slide frame, and a bracket that stands up on the slider. , a hydraulic jack with a frame fixed to the trolley side and a cylinder and legs fixed to the bracket.