JP3138818B2 - Hydraulic jack device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic jack device for a cargo-handling work vehicle or the like that lifts or transports a load by raising a table or fork-type bed by hydraulic pressure.

[0002]

Conventionally, a hydraulic cylinder mechanism and a plunger pump for raising and lowering a carrier are mounted on an oil passage base to form a hydraulic jack mechanism, and the hydraulic jack mechanism is mounted on a bogie frame on which a mast is erected. There is a technology to raise the bed by hydraulic pressure. However, when the plunger pump is erected on the upper surface of the oil passage base, the pumping handle is mounted at a high position, and there is a problem that the stepping operation position is increased. , The pumping handle is installed at a low position to facilitate stepping operation, but the mounting position of the hydraulic cylinder is high and the height of the bottom of the loading platform is high, which simplifies handling operations and improves cargo handling workability. Is not easily achieved. Further, in the hydraulic jack mechanism, since the vertical width of the oil passage base is significantly restricted, a valve for preventing the descent of the cargo bed cannot be incorporated in the oil passage base, and it is necessary to mount the valve on the hydraulic cylinder side, and to load the cargo. There is a problem in that the operation of adjusting the valve, which is performed by raising the loaded bed and increasing the load, cannot be easily performed.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a plunger pump operated by a pumping handle and a hydraulic jack device for mounting a hydraulic cylinder to an oil passage base, wherein a pump space for inserting the plunger pump is provided in the oil passage base. Formed on the bottom of the oil passage base.
Install the runner pump sideways on the top of the oil passage base.
Equipped with a hydraulic cylinder, a descent prevention valve for setting the descent speed
In the oil passage base between the hydraulic cylinder and the plunger pump.
With a plunger pump having a pumping handle, the pumping handle mounting position can be lowered so that the stepping operation can be performed at a lower position, and the hydraulic cylinder mounting position can be lowered to lower the lowest ground clearance of the carrier. The hydraulic jack mechanism that attaches the hydraulic cylinder to the oil passage base can be formed compactly, simplifying handling operations and improving cargo handling workability, and protecting the plunger pump with the oil passage base, and protruding the road surface. obtained without a problem of damaging by colliding a plunger pump at the object easily, also oil passage upper base surface side of the easily performed to obtain a maintenance such as cleaning the simplified, more installation dive prevention valve
Just secure the required vertical width to the left, right, and front of the oil passage base.
The rear width can be made compact, and a sudden drop prevention valve is installed.
Simplification of the mounting structure and improvement of the
Easy to assemble and assemble the sudden descent prevention valve
Business improvement and the manufacturing cost of those obtained Ri readily FIG like.

In addition, a sudden descent prevention valve is provided in the middle of the hydraulic connection between the lowering valve for lowering operation provided inside the oil passage base and the cylinder port of the hydraulic cylinder, and the valves and the cylinder port are short-circuited inside the oil passage base. It can be connected at a distance, and can easily maintain the function of the descent prevention valve and prevent oil leakage.

[0005] Further, a plurality of oil passages are formed in a multilayer shape at the upper part, side part, and front part of the oil passage base surrounding the pump space. Can be easily secured.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall side view, FIG. 2 is a plan view thereof, and FIG. 3 is a rear view thereof. A pair of right and left front wheels (1) and rear wheels (2) are mounted on a bogie frame (3), and viewed from the rear. The both ends of the gate-shaped round pipe mast (4) are fixed to the bogie frame (3), and the mast (4) is attached to the bogie frame (3).
Is erected. Further, a pair of left and right substrates (7) are integrally fixed on both sides of the rear portion of the table-type carrier (6) on which the load (5) is placed, and a pair of guide rollers (8) and guide pins (9) are provided on the substrate (7). The upper and lower guide rollers (8) are brought into sliding contact with the rear surface and the front surface of the mast (4), and the carrier (6) is attached to the mast (4) so as to be able to move up and down.

[0007] Further, a flat plate-shaped pedestal (1) is provided on the upper surface of the carriage frame (3) between both ends of the mast (4) at substantially the center in the left-right width.
0), an oil passage base (11) is removably fixed on the upper surface of the receiving stand (10), and a hydraulic cylinder (12) is inserted into an oil tank (13) so that the oil passage base (11) is inserted. ) Stand up on the upper surface and fix it.
2) A rear frame (1) of a mast (4) for supporting a sprocket (15) at the upper end of a piston (14) to be moved in and out on the upper end side and bolting and fixing an upper portion of an oil tank (13).
Load chain (17) connected to 6) and loading platform (6)
The intermediate portion is wound around a sprocket (15), and the loading platform (6) is moved up and down by the entrance and exit of the piston (14).

Further, as shown in FIGS. 4 and 5, a support shaft (18) is integrally fixed to the substrate (7) of the carrier (6), and a support shaft (18) is inserted into a shaft hole of the guide roller (8). Is rotatably inserted and fixed with a bolt (19).
A disk (20) projecting between the side surface of the mast (4) and the substrate (7) is formed integrally with one end of the guide roller (8), and the guide roller (20) having the disk (20) is formed. 8) is formed by molding synthetic resin, and the upper and lower guide rollers (8) made of synthetic resin are brought into contact with the mast (4) made of iron pipe from the rear and front to support the load (6) load. However, the guide roller (8) is rolled up and down.
As is clear from the above, a guide roller (8) for attaching the loading platform (6) to the mast (4) to be erected is provided on the loading platform (6), and between the side surface of the mast (4) and the loading platform (6). A part of the guide roller (8) is extended, and even if the shaft hole or the support shaft (18) of the guide roller (8) is worn, a disc (20) which is an extension of the guide roller (8) is provided. ) Prevents the substrate (7) of the carrier (6) from contacting the mast (4), prevents the mast (4) from being scratched, and also supports the guide shaft (18) of the guide roller (8). ) Is formed as short as possible so that the substrate (7) of the carrier (6) is brought close to the mast (4), the carrier (6) is stably supported on the mast (4), and the carrier (6) is allowed. By reducing the size and weight by increasing the supporting load or reducing the diameter of the guide roller (8) and the support shaft (18), the mass (4) Protection and bed (6) of achieving such simplification of the mounting structure.

Further, as shown in FIGS. 6 to 9, a pump space (21) having an opening on the lower surface side and the rear surface side is formed in the oil passage base (11), and the hydraulic cylinder (12) is formed.
The plunger pump (22) for operating the pump is installed in the pump space (21), and the pump (22) is mounted substantially horizontally in the front-rear direction inside the oil passage base (11).
A cylinder (23) which is detachably screwed and fixed to the oil passage base (11), and a return spring (2) via a spring seat (24).
5) is brought into contact with the piston (26) by the pump (2).
Prepare for 2).

A fast-forward lever (28) is rotatably supported at the rear opening of the oil passage base (11) via a fast-forward shaft (27), and a slow-feed shaft (29) is attached to the fast-forward lever (28). ), The slow-moving lever (30) is rotatably supported, and a pressure roller (31) provided on the slow-moving lever (30) is brought into contact with the piston (26) of the pump (22). An engaging body (32) for detachably engaging the feed lever (28).
Is provided on the delay lever (30), and a pumping handle (33) for stepping operation is provided on the delay lever (30),
As shown in FIG. 8, the lever (2) is connected by the engagement of the engaging member (32) by the stepping operation of the handle (33).
8) The plunger pump (22) is actuated by swinging the (30) integrally around the rapid feed shaft (27) to increase the lift of the bed (6) in one operation of the pump (22). The loading platform (6) is quickly raised when there is no load and the load is light (5), and as shown in FIG. 9, only the delay lever (30) is moved by the release of the engagement body (32) to the delay shaft (29). By swinging around, the plunger pump (22) is operated to reduce the stepping force of the handle (33) so that the heavy load (5) can be lifted easily.

As apparent from the above, the hydraulic cylinder (12) for raising and lowering the loading platform (6) and the plunger pump (2) operated by the pumping handle (33).
2) In a cargo-handling work vehicle in which the plunger pump (22) is inserted into an oil passage base (11), a pump space (21) for inserting the plunger pump (22) is formed in the oil passage base (11). The pump (22) is installed horizontally, the pumping handle (33) mounting position is lowered and the stepping operation is performed at a low position, and the hydraulic cylinder (12) mounting position is lowered to lower the loading platform (6) at the lowest level. The height is reduced, and the hydraulic jack mechanism for attaching the plunger pump (22) having the pumping handle (33) and the hydraulic cylinder (12) to the oil passage base (11) is formed compactly, thereby simplifying handling operations and handling workability. The plunger pump (22) is protected by an oil passage base (11), and the plunger pump (22) is brought into contact with a road surface protrusion. It is not eliminating the problem to be damaged and easily maintenance such as cleaning by simplifying the oil passage base (11) upper surface.

A pumping handle (33) is attached by providing a rapid feed shaft (27), which is a handle fulcrum shaft, in an opening of a pump space (21) on the rear surface of the oil passage base (11). Are formed at substantially the same height position as the plunger pump (22), so that the mounting height of the oil passage base (11) and the plunger pump (22) can be reduced, and the outer shape of the oil passage base (11) can be simplified. In addition, the maintenance work of the plunger pump (22) is simplified.

Further, the cylinder (23) of the plunger pump (22) is detachably fixed to the oil passage base (11), and a plunger pump (22) having a different specification is mounted also as the oil passage base (11). In addition to changing the amount of hydraulic oil pumped from the plunger pump (22) to the hydraulic cylinder (12) and increasing or decreasing the operating force of the pumping handle (33), the production cost of the oil passage base (11) is reduced and processed by mass production. A control valve (45) for improving the accuracy and setting the loading platform (6) to set the lifting load, described later (45)
And improve long-term management such as storage and maintenance of replacement parts.

Further, a rapid feed lever (28) is connected to the oil passage base (11) via a rapid feed shaft (27) which is a handle fulcrum shaft.
And a fast-forward lever (28) is provided with a slow-feed lever (30) via a slow-feed shaft (29), and the pumping handle (3) is provided.
3) is connected to the pressure roller (3).
1) through the piston (2) of the plunger pump (22)
6), and the fast forward lever (28) and the slow forward lever (3)
Both of the levers (28) and (30) are compactly arranged on the oil passage base (11), and the levers (28) and (30) are selectively used to improve the loading platform (6) and the operability of lifting.
In addition to simplifying the mounting structure of the (30), the engaging member (32) for connecting the fast forward lever (28) and the slow forward lever (30) is provided on the slow forward lever (30). A compact configuration in which the operation unit of the combination (32) is projected from the upper surface of the slow feed lever (30), and the fast feed lever (28) is clamped between the oil passage base (11) and the slow feed lever (30). Thus, the engagement body (32) for selectively using the levers (28) and (30) can be operated.

Further, a slow feed shaft (29) for connecting the fast feed lever (28) and the slow feed lever (30) and a pressure roller (3).
1) Right and left outer sides of the mounting portion are surrounded by an oil passage base (11), and a connecting portion between each of the levers (28) (30) and the plunger pump (22) is protected by a side surface of the oil passage base (11). The rear opening of the pump space (21) of the oil passage base (11) is closed by the delay lever (30), and the pump space (21) formed in the oil passage base (11) in a bag shape is delayed as a lid member. Lever (30)
In addition, the maintenance workability is improved by simplifying the outer shape of the oil passage base (11), and the plunger pump (22) is protected by the delay feed lever (30).

Further, as shown in FIGS. 10 to 13, a suction oil passage (35) provided with a suction valve (34) for supplying hydraulic oil to the plunger pump (22), and high-pressure oil is sent from the plunger pump (22). Discharge valve (36)
, A relief oil path (39) provided with a relief valve (38) for setting the maximum load on the loading platform (12), and the valves (34), (36), (3)
8) A pump port (40) for hydraulically connecting the plunger pump (22) to the plunger pump (22), and a loading platform (6) which is opened and closed by operating a lowering lever (41) automatically closed by a closing return spring (42a). A descending oil passage (43) provided with a valve (42), and each of the valves (34) and (38);
A tank port (44) for hydraulically connecting the (42) to the oil tank (13), and a sudden descent prevention valve (45) for adjusting the lowering speed of the bed (6) when lowering by opening the lowering valve (42). ) And the valve (45) are connected to the hydraulic cylinder (1).
A cylinder port (47) to be hydraulically connected to (2) is formed at the upper part, side part, and front part surrounding the pump space (21) of the oil passage base (11).

As is clear from the above, the oil passage base (1
Loading bed provided in 1) (6) Lowering valve for lowering operation (42)
A closing return spring (4) is
2a) is provided, and the lowering lever (41) moves backward just by releasing the hand of the operator during the lowering operation of the carrier (6), and the lowering valve (4)
2) Close the lowering valve (42) by closing the lowering valve (42). The lowering operation time during the lowering operation is shorter than that of the conventional manual closing operation. An appropriate lowering valve (42) is prevented from lifting when the bed (6) is closed.

A plunger pump (22) is provided at the bottom of the oil passage base (11), and a hydraulic cylinder (12) is provided on the upper surface of the oil passage base (11). (45) hydraulic cylinder (12)
The left and right and front and rear widths of the oil passage base (11) are reduced simply by installing the oil passage base (11) in the oil passage base (11) between the plunger pump (22) and the plunger pump (22). Formed in a descent prevention valve (45)
In addition to simplifying the mounting structure of the pallet and improving the operability of adjusting the lowering speed of the carrier (6),
5) To improve the assembly workability and reduce the manufacturing cost.

A descent prevention valve (45) is provided during the hydraulic connection between the lowering valve (42) for lowering operation and the cylinder port (47) of the hydraulic cylinder (12), which is installed inside the oil passage base (11). And each of the valves (42)
(45) and the cylinder port (47)
1) A short-distance connection is made inside to maintain the function of the descent prevention valve (45) and prevent oil leakage, etc., and a plunger pump (22) installed in the oil passage base (11). ) And a cylinder port (47) of the hydraulic cylinder (12) are provided with a sudden drop prevention valve (45) in the middle of the hydraulic connection, and also serves as a cylinder oil passage (46) connecting the discharge valve (36) and the cylinder port (47). The steep descent prevention valve (45) is arranged to simplify the hydraulic connection structure and prevent oil leakage.

Further, a plurality of oil passages (35), (37), (39), (43), and (46) are formed in a multilayer shape on the upper, side, and front portions of the oil passage base (11) surrounding the pump space (21). Formed and three-dimensional oil passages (35) (37) (39) (4)
3) By forming (46), the oil passage base (11) is reduced in size and the pump space (21) necessary for installing the plunger pump (22) is secured, and the oil passage base (1) is secured.
The load carrier (6) to be installed in 1) The pressure adjusting nut (38a) of the relief valve (38) for setting the maximum lifting load and the pressure adjusting nut (45a) of the sudden drop prevention valve (45)
By distributing and disposing the nuts (38a) and (45a) on the left and right sides of the oil passage base (11), a problem of misadjustment due to misidentification can be eliminated. Improve operability.

The pumping handle (33)
The hydraulic oil sucked from the oil tank (13) into the plunger pump (22) through the suction valve (34) by the foot operation of the hydraulic cylinder (12) through the discharge valve (36) and the control valve (45). Pumping the cylinder (1
The piston (14) of 2) is advanced upward, and the carrier (6) is raised below the set pressure of the relief valve (38).
Opening of the lowering valve (42) of the lowering lever (41) causes the hydraulic oil of the hydraulic cylinder (12) to be supplied to the oil tank (1).
Returning to 3), the loading platform (6) is lowered at a speed lower than the speed set by the rapid descent prevention valve (45), and the operator grips the push / pull handle (48) on the back of the mast (4) to move and move.

[0022]

As apparent from the above embodiments, the present invention relates to a hydraulic jack device for mounting a plunger pump (22) operated by a pumping handle (33) and a hydraulic cylinder (12) to an oil passage base (11). A pump space (21) in which the plunger pump (22) is inserted is formed in an oil passage base (11).
Plunger pump (22) at the bottom of base (11) sideways
And a hydraulic cylinder on the upper surface of the oil passage base (11).
(12) is provided, and a descent prevention valve (4
5) replace the hydraulic cylinder (12) with the plunger pump (2).
2) The pumping handle (33) is attached at a lower position so that the stepping operation can be performed at a lower position, and the hydraulic cylinder (1)
2) The plunger pump (22) having the pumping handle (33) and the hydraulic cylinder (12) can be lowered by lowering the mounting position to lower the lowest height of the bed (6).
The hydraulic jack mechanism for attaching the oil pump to the oil passage base (11) can be formed compactly, so that the handling operation can be simplified and the cargo handling workability can be easily improved, and the plunger pump (22) can be connected to the oil passage base (11). ), The plunger pump (22) can be easily prevented from being damaged by colliding with the road surface protrusion, and maintenance such as cleaning can be easily performed by simplifying the upper surface side of the oil passage base (11). And also a dive prevention valve
Oil passage only by securing the vertical width required for the
The left, right, front and rear widths of the base (11) can be made compact
Simplification of the mounting structure of the rapid descent prevention valve (45)
(6) Easy lowering speed adjustment operability, etc.
Of the sudden drop prevention valve (45)
Easy assembly workability and reduced manufacturing cost
It can be planned .

Further, a descent prevention valve (45) is provided in the middle of the hydraulic connection between the descent valve (42) for descent operation provided inside the oil passage base (11) and the cylinder port (47) of the hydraulic cylinder (12). In each of the valves (42)
(45) and the cylinder port (47)
1) Short-term descent prevention valve that can be connected for a short distance inside (45)
The function can be easily maintained and oil leakage can be easily prevented.

Further, a plurality of oil passages (35), (37), (39), (43), and (46) are formed in a multi-layer shape on the upper, side, and front portions of the oil passage base (11) surrounding the pump space (21). A three-dimensional oil passage (35) (37) (3
9) (43) (46) formation of oil passage base (11)
It is possible to easily reduce the size and secure the pump space (21).

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a plan view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is an enlarged plan view of a mast portion.

FIG. 5 is an enlarged plan view of a guide roller unit.

FIG. 6 is a side view of a hydraulic cylinder unit.

FIG. 7 is a side view of an oil passage base.

FIG. 8 is an explanatory diagram of the operation.

FIG. 9 is an explanatory diagram of the operation.

FIG. 10 is a hydraulic circuit diagram.

FIG. 11 is an enlarged plan view of an oil passage base.

FIG. 12 is an enlarged side view of the same.

FIG. 13 is an enlarged plan sectional view of the same.

[Explanation of symbols]

 (6) Loading bed (11) Oil passage base (12) Hydraulic cylinder (21) Pump space (22) Plunger pump (33) Pumping handle (35) Suction oil passage (36) Discharge valve (37) Discharge oil passage (38) Relief valve (39) Relief oil passage (42) Descending valve (43) Descending oil passage (45) Sudden descent prevention valve (46) Cylinder oil passage (47) Cylinder pot

Continuation of the front page (56) References JP-A-9-227087 (JP, A) JP-A-9-132390 (JP, A) JP-A-3-98996 (JP, A) JP-A-2-283975 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B66F 3/42, 9/06

Claims (3)

(57) [Claims] 1. A plunger pump (22) operated by a pumping handle (33) and a hydraulic jack device for mounting a hydraulic cylinder (12) to an oil passage base (11). A pump space in which the plunger pump (22) is inserted. (21) is formed in the oil passage base (11), and the plunger pump (2) is provided at the bottom of the oil passage base (11).
2) Install the hydraulic cylinder on the top of the oil passage base
(12), a descent prevention valve for setting the descent speed
(45) hydraulic cylinder (12) and plunger pump
A hydraulic jack device which is provided inside an oil passage base (11) between (22) . 2. A descent operation to be installed in an oil passage base (11).
The action lowering valve (42) and the hydraulic cylinder (12)
Drip prevention valve during connection of hydraulic port (47)
The hydraulic jack device according to claim 1, wherein (45) is provided . 3. An oil passage that surrounds a pump space (21).
A plurality of oil passages (3) are provided at the top, side and front of the base (11).
5) Form (37) (39) (43) (46) in multilayer
Hydraulic jack device according to claim 1, characterized in that the.