JP2981841B2 - Cargo handling vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides, for example, a fork-type carrier having a front moving wheel at the tip, a hydraulic cylinder for supporting the base end of the carrier and elevating the same, and a rear moving wheel for supporting the hydraulic cylinder. The present invention relates to a cargo handling vehicle such as a pallet lift truck.

[0002]

Conventionally, a front moving wheel is mounted on a front portion of a loading bed via a pivot arm so as to be able to move up and down.
There is a technology that attaches a rear moving wheel to the rear part of the bed via a hydraulic cylinder and moves the rear moving wheel by changing the direction with a pumping handle that drives the hydraulic cylinder, but if the road surface is inclined, if the load is heavy, Even if the handle is pulled backward by the handle, the force of descending forward is likely to be larger, and there is a problem that it moves down at high speed in a direction different from the desired direction. Also, even if a brake to be braked by the foot pedal is attached to the moving wheel, the operator cannot step on the pedal while maintaining the posture of pushing and pulling the handle, and a brake lever provided by the operator with the hand is provided. Also,
With a simple brake structure in which a brake shoe is pressed against a moving wheel, there is a problem in handling and structure such that a braking force tends to be insufficient, and a large brake lever operating force or an expensive brake structure is required.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a mobile
A loading platform that supports the wheels up and down via a hydraulic cylinder
Plunger pump to supply hydraulic pressure to the pressure cylinder
And a handle for moving the loading platform back and forth by pulling operation.
Crane brake shoes on moving wheels
A brake operating member for braking
Holder that supports the working member up and down freely and brake operation
Lock that locks the position when the member moves to the braking position
And an oil tank around the hydraulic cylinder.
The handle and the holder are swingably supported via a fulcrum shaft.
The handle and swing the handle to move the plunger
The brake and the brake operating member are operated, and a brake operation for pressing the brake shoe against the moving wheel can be easily performed as necessary while maintaining the posture in which the operator pushes and pulls the handle. The dual use can easily secure the moving wheel braking force and reduce the manual braking operation force by pressing the brake shoe, and can easily improve the handling operability and simplify the brake structure.

Further, a cam is provided for locking the brake operating member to the lock body when the brake operating member is moved to the braking position by operating the handle, so that an operation for locking the brake operating member at the braking position is performed. This can save the trouble of performing, and can surely perform the moving wheel braking in an emergency.

Further, a spring is provided for locking the brake operating member to the lock body when the brake operating member is moved to the braking position by operating the handle, and an operation for locking the brake operating member at the braking position is provided. This can save the trouble of performing, and can surely perform the moving wheel braking in an emergency.

Further, a base frame is connected to both ends of a fulcrum shaft of a handle, a brake operating member is mounted on the base frame via a holder, and the base frame is formed in a divided manner so as to be separable in a direction of a fulcrum shaft axis. Thus, the base frame can be detachably fitted to both ends of the fulcrum shaft in a state where the fulcrum shaft is inserted into the handle and the handle is assembled, and the mounting and dismounting operation of the pedestal frame can be performed without detaching the fulcrum shaft. Things.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a rear moving wheel portion, FIG. 2 is an overall side view of a pallet lift truck, FIG.
FIG. 4 is a side view of the rear portion of the loading platform. In the drawing, (1) is a forked fork-shaped loading platform having a chevron support (2). Circle (4)
(5) is mounted so that it can protrude downward. (6) is a jack device for supporting the base end of the carrier (1) and elevating the same, and the device (6) is a ram type hydraulic cylinder (7).
And the tip of the piston rod (8) of the cylinder (7) is brought into contact with the lower surface of the chevron support (2) of the carrier (1), and the carrier (1) is formed so as to be raised by hydraulic pressure. An axle (9) is pivotally attached to the lower end of the cylinder (7), and rear traveling wheels (10) (10) are mounted.

A base (11) for forming a hydraulic circuit is provided at an intermediate portion of the cylinder (7).
A plunger pump (12) is erected on the rear base (11), and an oil tank (13) is provided on the peripheral side of the cylinder (7) above the base (11). Further, the base (1
1) a pressure relief valve (not shown) for the cylinder (7) is provided;
The cylinder (7) and the pump (12) are connected via a discharge valve (not shown), the pump (12) and the oil tank (13) are connected via a suction valve (not shown), and the cylinder (7) is connected to the cylinder (7). A plurality of oil passages (not shown) communicating with the oil tank (13) via a pressure relief valve are formed in the base (11). The pressure relief valve is opened to release the oil in the cylinder (7). While returning to the tank (13) and lowering the loading platform (1), the oil of the pump (12) is supplied to the cylinder (7) via a discharge valve, and the oil of the tank (13) is supplied via the suction valve. 1
It is configured to suck in 2).

Next, a seat plate (15) is provided at the end of the plunger piston (14) of the pump (12), and the spring (1) is held so as to protrude the piston (14).
6) is attached. Then, a lever member (19) for supporting a roll (17) contacting the tip of the piston (14) at the lower end via a pivot shaft (18) is provided, and the lever member (19) is connected to the cylinder ( 7) The fulcrum bracket (13a) is supported via a fulcrum shaft (20) so as to rotate backward and forward in the front-rear direction. The fulcrum bracket (13a) is fixed to the oil tank (13).

Further, a lower end of a T-shaped pumping handle (21) is integrally connected and fixed to the upper surface of the lever member (19), and the pumping handle (2) is placed on the lever member (19).
1) is erected, the handle (21) is pivotally rotated in the front-rear direction to operate the plunger pump (12), and the hydraulic cylinder (7) is driven to raise the carrier (1). ing.

Further, a bearing plate (23) is rotatably provided on a peripheral side of the ram cylinder (7) below the base (11) via a bearing (22), and a support shaft (24) installed on the carrier (1). ), One end of an L-shaped arm (25) (25) pivotally connected to an intermediate portion is pivotally supported on both sides of the plate (23). The other ends of the arms (25) and (25) are connected to pivot arms (3) and (3) of front moving wheels (4) and (5) via connecting rods (26) and (26). )
The support portion (2) of the carrier (1) is lifted by the ram piston (8), and the arms (25) (2)
5) and the pivoting arms (3) and (3) are rotated via the rods (26) and (26), and the front moving wheels (4) and (5) are protruded below the loading platform (1) to make the tip of the loading platform (1). The handle (21) is raised and lowered while the loading platform (1) is kept horizontal. The pump (12) is operated by pumping the handle (21), and the tank (13) is moved by the plunger pump (12).
The oil inside the cylinder (7) is pumped into the hydraulic cylinder (7), and the ram piston (8) of the cylinder (7) is moved upward to keep the bed (1) horizontal, and the handle (21) is pushed. It is configured to carry pallet-mounted luggage by pulling and rotating.

Further, as shown in FIGS. 1 and 5, the lower end of the hydraulic cylinder (7) is fitted into a receiving cylinder (27), and an axle (9) is inserted into the hydraulic cylinder (7) and the receiving cylinder (27). The retaining pin (29) is engaged with the hydraulic cylinder (7) and the axle (9) through the opening (28) of the receiving cylinder (27), and the axle (9) is inserted into the lower end of the hydraulic cylinder (7). , The receiving cylinder (27) is detachably fixed. Further, the fulcrum arm (30) and the spring seat plate (31) are integrally fixed to the receiving cylinder (27), and the brake arm (33) is rotatably connected to the fulcrum arm (30) via the support shaft (32). Brake shoe (3) to be pressed against the outer peripheral surface of the rear moving wheel (10).
4) is fixed to the brake arm (33), and a brake release spring (3) is provided between the spring seat plate (31) and the brake arm (33) via a guide rod (35).
6), the brake arm (33) is lifted by the spring (36), and the brake shoe (34) is separated from the rear moving wheel (10).

Further, both ends of the inverted U-shaped stand frame (37) are rotatably supported on both sides of the fulcrum bracket (13a) via the fulcrum shaft (20), and the stand extends downward and obliquely downward. A cylindrical holder (38) is integrally fixed to the rear surface of the intermediate portion of the frame (37), and a cylindrical shaft body (39) serving as a brake operating member is inserted into the holder (38) so as to be freely movable up and down, and the holder ( 38), an L-shaped guide groove (40) is formed, and a guide pin (41) fixed to the shaft body (39) is slidably engaged with the guide groove (40). The guide pin (41) moves in the vertical groove of (40), and the shaft (39) moves up and down with respect to the holder (38), while rotating the shaft (39) around the shaft center at the lowest position. By the guide groove (40)
The guide pin (41) is engaged in the horizontal groove of the shaft body (3).
The brake lock state which restricts the vertical movement of 9) is configured to be maintained.

Further, a hemispherical cap (42) made of synthetic resin is put on the upper end of the iron shaft (39), and the handle (2)
When the 1) is tilted backward, the rear surface of the lever member (19) is brought into contact with the cap (42) to lower the shaft (39), and the upper end lock operation lever (4) of the shaft (39) is lowered.
3) is fixed, and the lever (43) is projected substantially horizontally. When the shaft body (39) is lowered, the lever (4)
3) The shaft (39) is rotated around the axis by the operation, the guide pin (41) is engaged in the horizontal groove of the guide groove (40), and the shaft (39) is locked in the lowered position. The shaft (39) is reversed by the reverse operation of the lever (43), and the guide pin (4) is inserted into the vertical groove of the guide groove (40).
1) is returned, and the shaft (39) is configured to be supported in a vertically movable manner.

The rear movable wheel (1) when the brake arm (33) is lifted by the bendable and rotatable ball joint (44) and the brake release spring (36).
The lower end of the shaft (39) is connected to the upper surface of the brake arm (33) via a bolt (45) for adjusting the distance between the brake arm (0) and the brake shoe (34). The vertical swing of (33) is interlocked. Thus, the pumping handle (21)
Is tilted backward to lower the shaft (39), and the spring (36)
The brake arm (33) is pressed down against the rear wheel (10), and a brake shoe (34) is pressed against the outer periphery of the rear moving wheel (10) to apply a brake. Brake arm (33)
And lift the brake shoe (3) from the rear moving wheel (10).
4), and the shaft body (39) is raised, so that the moving speed can be reduced when the vehicle descends on the inclined road surface, and the vehicle can be stopped in the middle of the inclined road surface. Also, the handle (21) is tilted down to rotate the shaft (3).
When the shaft (39) is rotated by the lock operation lever (43) when the 9) is lowered, the guide pin (41) is engaged in the horizontal groove at the lower end of the guide groove (40), and the brake shoe ( 34) is configured so that the braking state in which the rear moving wheel (10) is pressed against the rear moving wheel (10) is maintained.

As is clear from the above, the rear moving wheel (1)
0), a loading platform (1) that can be raised and lowered, a hydraulic cylinder (7) that raises the loading platform (1), and a swingable pumping handle (21) that moves the loading platform (1) by pushing and pulling operations. And a shaft (39), which is a brake operating member for pressing the brake shoe (34) against the rear moving wheel (10), is connected to the handle (21). Brake shoe (34) while maintaining the posture of pushing and pulling
The brake shoe (34) can be operated by pressing the handle (21) for operating the pump (12) and the push / pull operation while performing a braking operation for pressing the pressure on the moving wheel (10).
The rear moving wheel (10) is configured to be able to secure the braking force and reduce the brake operation force by the pressure bonding of the rear moving wheel (10).

Further, as shown in FIG. 6, the brake release spring (36) has a sandwiching spring structure and is wound around a support shaft (32), so that a spring seat (31) and a guide rod (FIG. 1) shown in FIG. 35) can be omitted to reduce the manufacturing cost,
Guard frame (47) integrally formed with bumper (46)
The bumper (46) collides with an obstacle when the handle (21) is moved backward by pulling the handle (21) with the bolt (48) to the brake shoe (34) to prevent damage to the brake arm (33) and the like. The guard frame (47) abuts on the worker's foot to prevent the worker's foot from being stepped on by the rear moving wheel (10).
The brake shoe (34) is pressed against the rear moving wheel (10) by the collision force of the above or the contact force of the guard frame (47), and the rear moving wheel (10) is automatically braked. In addition, the lock operation cam (49) is formed by bulging the rear slope of the base frame (37), and the guide groove (40), which is a lock body, is formed in a deformed V-shape. One of the V-shapes is a long groove and the other is a short groove.
The guide pin (41) moves in the long groove of the guide groove (40) by raising and lowering, and the guide pin (41) engages in the short groove of the guide groove (40) to lower the shaft (39) to the lower position. When the pumping handle (21) is tilted backward to lower the shaft (39), the lock operation lever (43) comes into sliding contact with the cam (49), and the cam (4)
By the guide of 9), the shaft body (39) rotates around the axis,
When the shaft body (39) is lowered to the lowest position, the guide groove (40)
The guide pin (41) moved in the long groove of the guide groove (4)
The brake shoe (34) is engaged in the short groove of (0), and automatically maintains a braking state in which the brake shoe (34) is pressed against the rear moving wheel (10). Further, a foot pedal (46a) is integrally fixed to the bumper (46), and when the vehicle is parked, the pedal (46a) is depressed with a foot and a brake shoe (34).
Is pressed against the rear traveling wheel (10), and the brake shoe (34) is held at the pressure-bonded position by the guide pin (41), whereby the parking brake can be operated. At this time, the operation of pressing down the handle (21) and pressing the brake shoe (34) is unnecessary.

As is clear from the above, the handle (2
1) A lock operation cam (4) for locking the shaft (39) in the guide groove (40) as a lock when the shaft (39) as a brake operation member is moved to a braking position by an operation.
9) to save the trouble of performing an operation for locking the shaft body (39) in the braking position.
0) The brake can be reliably performed, and the handle (21)
Even if the worker falls down during the traveling movement by pushing and pulling the, the rear traveling wheel (10) is automatically braked and maintained just by tilting the handle (21).

Further, as shown in FIG. 7, a pinch spring-type lock operation spring (5) for rotating the shaft body (39) around the axis.
0), the middle of the spring (50) is wound around the shaft (39), and the hook (51) of the base frame (37) and the shaft (3) are wound.
9) hook both ends of the spring (50) to the hook (52),
When the shaft (39) descends most, the shaft (39) is rotated by the force of the spring (50) to automatically engage the guide pin (41) in the horizontal groove of the guide groove (40). The brake (34) is pressed against the moving wheel (10) to maintain a braking state. When the handle (21) is operated to move the shaft (39), which is a brake operating member, to the braking position, the shaft (39). ) Is a guide groove (40) which is a lock body.
A lock operation spring (50) for locking the shaft (39) in the braking position is omitted as in FIG. 6, and an emergency rear moving wheel (10) is provided. ) Braking can be performed reliably. Note that both the cam (49) in FIG. 6 and the spring (50) in FIG. 7 may be provided at the same time.

As shown in FIGS. 8 and 9, the base frame (37) includes a pair of left and right frames (53) (5).
4) and a central frame (55) bent into a semicircle in plan view
And left and right frames (53) (54) are detachably fixed to both ends of the center frame (55) by bolts (56). Further, the holder (38) is integrally fixed to the inner side of the center of the semicircular portion of the central frame (55), and the shaft body (39) is mounted so as to be able to move up and down and rotate freely. A rear bumper (57) that covers the rear side is fixedly fastened to a bolt (58) on the center outer surface of the semicircular portion of the central frame (55).

The left and right frames (53) (5)
4) The hex bolt head of the fulcrum shaft (20) is rotatably fitted into the circular shaft hole (59) (59) of (4), and the left and right frames are rotatably connected around the fulcrum shaft (20) axis. (5
3) Bolt (56) on center frame (55) with (54)
… Fixed and fixed, while assembling the base frame (37), removing the bolts (56)
And the left and right frames (53) and (54) are disassembled and the fulcrum shaft (2)
0), the left and right frames (53) and (54) are separated from each other, and the base frame (37) is removed from the fulcrum shaft (20).
A base frame (37) is connected to both ends of the fulcrum shaft (20) of the handle (21), and a shaft body (39) serving as a brake operating member is attached to the base frame (37), and the base frame (37) is divided and formed. Then, the fulcrum shaft (20) is detachably attached in the axial direction, and the support frame (37) is inserted into the handle (21) to assemble the handle (21). 20) In a state where the spring (16) of the plunger pump (12) is compressed by detachably fitting the two ends, the mounting and dismounting operations of the base frame (37) can be performed without detaching the fulcrum shaft (20). Support bracket (13a) and lever member (19)
The attachment / detachment operation of the base frame (37) can be performed without performing the attachment / detachment operation of the fulcrum shaft (20) to be inserted or removed from the base frame (37).

[0022]

As is apparent from the above embodiment, the present invention is directed to moving the moving wheel (10) up and down through the hydraulic cylinder (7).
To the supporting platform (1) and the hydraulic cylinder (7)
Pump (12) for supplying pressure and push-pull operation
Handle (21) for moving the loading platform back and forth by
On the moving wheels (10)
-Brake operating member that applies pressure to (34) to apply braking
(39) and the brake operation member (39) can be moved up and down freely.
(38) and a brake operating member (3)
9) Lock that locks the position when moved to the braking position
And a hydraulic cylinder (7).
The oil tank (13) on the peripheral side is connected to the oil tank (13) via a fulcrum shaft (20).
The handle (21) and the holder (38) are swingably supported.
The plunger by swinging the handle (21).
Operate the pump (12) and the brake operating member (39).
The brake operation of pressing the brake shoe (34) against the movable wheel (10) can be easily performed as necessary while maintaining the posture in which the operator pushes and pulls the handle (21), and The moving wheel (1) formed by crimping of the brake shoe (34) by double use of the handle (21).
0) It is possible to easily secure the braking force, reduce the manual braking operation force, and the like, and to easily improve the handling operability and simplify the brake structure.

A cam (49) for locking the brake operating member (39) to the lock body (40) when the brake operating member (39) is moved to the braking position by operating the handle (21). , Brake operating member (39)
This makes it possible to save the trouble of performing an operation to lock the moving wheel (10) at the braking position, and to reliably perform the emergency braking of the movable wheel (10).

A spring (50) for locking the brake operating member (39) to the lock body (40) when the brake operating member (39) is moved to the braking position by operating the handle (21). , Brake operating member (39)
This makes it possible to save the trouble of performing an operation to lock the moving wheel (10) at the braking position, and to reliably perform the emergency braking of the movable wheel (10).

The fulcrum shaft (20) of the handle (21)
A base frame (37) is connected to both ends, and the base frame (3
7) Brake operation member (39) via holder (38 )
The pedestal frame (37) is divided and formed so as to be separable in the axial direction of the fulcrum shaft (20). The fulcrum shaft (20) is inserted into the handle (21) so that the handle (21) is inserted. 21) with the base frame (3) assembled.
7) can be detachably fitted to both ends of the fulcrum shaft (20), and the mounting and dismounting operations of the base frame (37) can be performed without detaching and attaching the fulcrum shaft (20).

[Brief description of the drawings]

FIG. 1 is a side view of a rear moving wheel.

FIG. 2 is an overall side view of a pallet lift truck.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of a rear portion of the loading platform.

FIG. 5 is a rear view of FIG. 1;

FIG. 6 is a side view showing a modification of FIG. 1;

FIG. 7 is a side view of the same.

FIG. 8 is a side view of the same.

FIG. 9 is a plan view of FIG. 8;

[Explanation of symbols]

 (1) Loading bed (7) Hydraulic cylinder (10) Rear moving wheel (21) Pumping handle (34) Brake shoe (37) Base frame (39) Shaft (brake operating member) (49) Lock operating cam (50) Lock Operation spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-99865 (JP, A) JP-A-56-48953 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B62B 3/06 B62B 5/04

Claims (4)

(57) [Claims] 1. A hydraulic cylinder (7) is attached to a moving wheel (10).
Loading platform (1) that can be moved up and down freely via a hydraulic cylinder
A plunger pump (12) for supplying hydraulic pressure to (7);
A handle (2) that moves the carrier back and forth by pushing and pulling
1) in the loading and unloading vehicle equipped with the moving wheels (10)
A brake that applies pressure by pressing the brake shoe (34)
Brake operating member (39) and brake operating member (39)
(38) for vertically moving the brake
Position fixed when working member (39) moves to braking position
And a hydraulic lock (40).
The fulcrum shaft (20) is attached to the oil tank (13) on the peripheral side of the
The handle (21) and the holder (38) are swung
With the handle (21)
Plunger pump (12) and brake operating member (39)
And a cargo handling vehicle configured to operate the following . 2. A cam (49) for locking the brake operating member (39) to the lock body (40) when the brake operating member (39) is moved to the braking position by operating the handle (21). The cargo handling vehicle according to claim 1, characterized in that: 3. A spring (50) for locking the brake operating member (39) to the lock body (40) when the brake operating member (39) is moved to the braking position by operating the handle (21). The cargo handling vehicle according to claim 1, characterized in that: 4. A base frame (37) is connected to both ends of a fulcrum shaft (20) of a handle (21).
A brake operating member (39) is mounted on the base frame via a holder (38), and the base frame (37) is formed in a divided manner so as to be separably mounted in a direction of a fulcrum shaft (20). Cargo handling vehicle described in.