JPH089332B2 - Hand lift truck - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand lift truck that lifts and conveys a pallet or the like on which luggage is placed.

[0002]

2. Description of the Related Art Conventionally, there has been a self-propelled structure having driving rear wheels rotated by an electric motor.

[0003]

In the above-mentioned prior art, since the drive rear wheels are arranged below the ram cylinder that supports the luggage carrier, a pair of rear wheels are rotatably provided on both lower sides of the ram cylinder for manual propulsion. Compared to the structure, the mounting position of the ram cylinder is higher and it is necessary to have a five-wheel structure with a pair of auxiliary wheels that prevent tipping over from side to side, and a ram cylinder with a manual propulsion structure cannot be used easily. However, there is a problem in that it is not possible to easily reduce the size of the ram cylinder portion and reduce the manufacturing cost.

[0004]

SUMMARY OF THE INVENTION However, according to the present invention, a ram cylinder for supporting a luggage platform is erected, a hydraulic base is integrally fixed to an intermediate portion of the ram cylinder, and a plunger pump, an operating handle, and an upper side of the hydraulic base are provided. In a hand lift truck in which an oil tank is provided, a table is horizontally rotatably provided on the ram cylinder on the lower surface side of the hydraulic base, and an arm for moving the front wheel of the front of the luggage platform downward is connected to the table by an electric motor. The vehicle includes a traveling unit frame provided with driving rear wheels for rotation and rotatable rear wheels on both left and right sides, and an axle frame for mounting the driving rear wheels is rotatably supported on the unit frame about a vertical axis. Then, the axle frame is connected to the hydraulic base via a steering link and is fixed to the underside of the table.
Of the ram cylinder on the outer periphery of the ram cylinder.
The unit frame via the bearing fulcrum shaft.
It can be freely supported and the unit frame
The maximum amount of rolling around the rolling fulcrum axis is defined.
By providing a stopper to control the ram cylinder and hydraulic base of the conventional manual propulsion structure, the drive wheel can be installed by simple processing such as welding the unit frame, compared to the conventional electric propulsion structure. mounting obtain the height low, combined well with obtaining aims to facilitate and reduce the manufacturing cost by four-wheel structure manually propelled structure, due to said unit frame is rolling around the fulcrum shaft
Te, obtained by lowering the driving rear wheels follow to the slope or unevenness of a road surface, and the ground maintains the driving rear wheels in which idling of the rear wheels (slip) may be readily prevented, in the table under side Ramushi
Compact and good strength for the receiver that is firmly installed on the outer circumference of the binder
Good support for the unit frame, drive rear wheels are always appropriate
Secure driving ground pressure to reliably propel the truck body
Unstable as the unit frame tilts above a certain level
In this condition, further tilting is regulated and this transportation operation is
It is possible to improve workability and safety in the industry .

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view of the ram cylinder part, FIG. 2 is a perspective view of the whole, and FIG. 3 is a plan view of the ram cylinder part. 2) The (2) (2) is attached to the front end of the platform (1), and a ram cylinder (4) that supports the chevron (3) on the rear side of the platform (1) is erected upright in the middle of the ram cylinder (4) The hydraulic base (5) is integrally fixed substantially horizontally, and the plunger pump (6) for driving the ram cylinder (4), the oil tank (7), and the operation handle (8) for pumping and steering are provided as described above. It is provided on the upper side of the hydraulic base (5),
A table (10) is horizontally rotatably mounted on a ram cylinder (4) on the lower surface side of the hydraulic base (5) through a bearing (9) to allow the front wheel (2) to move in and out below the luggage carrier (1). One end of the arm (11) is attached to the table (10).
, The plunger pump (6) is operated by pumping the handle (8), and the oil in the tank (7) is fed to the ram cylinder (4), and the ram piston (12).
To lift up the chevron (3), and the front wheel (2) is projected downward via the arm (11) and the rod (13) to raise the luggage carrier (1) while the handle ( By operating the pressure release lever (14) of 8), the oil of the ram cylinder (4) is returned to the tank (7), and the luggage carrier (1) is lowered.

Further, as shown in FIG. 4, a traveling unit frame (15) attached to the table (10) is provided, and a cylinder which allows the lower end of the ram cylinder (4) to be inserted and which is locked by the shaft (4a). The upper end of the body (10a) is welded and fixed to the lower surface of the table (10), and the tubular body (10a)
A fulcrum shaft (10b) is projected on the
The receiving cylinder (15a) through which the b) is rotatably inserted is integrally fixed to the unit frame (15), and the table (1
0) through the fulcrum shaft (10b) to the unit frame (1
5) is mounted so that it can be rolled freely within the range restricted by the stoppers (10c) (10c). Then, the direction-changing idle rear wheel (17) provided with the brake pedal (16)
Is attached to one side of the unit frame (15), and a drive rear wheel (19) rotated by an electric motor (18) is rotatable around a vertical axis center on the other side of the unit frame (15). A bracket (21) of the hydraulic base (5) and a bracket (22) of the axle frame (20) are mounted so that the direction can be freely changed.
The steering shaft (25) is connected to the hydraulic base (5) via the steering link (25) by connecting both ends of the steering link (25) to the shaft via the pins (23) and (24). A stopper (26a) around the steering axis of the rear wheel (19) provided on (20) or a bracket (2
Stoppers (26b) (26) that restrict the horizontal rotation of 1)
Within the range of b), the hydraulic base (5), the bracket (21), the steering link (25), the bracket (22), the axle frame (2) are operated by the steering operation of the handle (8).
It is configured to change the direction of the rear drive wheel (19) via 0).

Further, as shown in FIG. 5, the electrical equipment case (27) is fixed by screws to the chevron portion (3) of the luggage carrier (1), and the detachable rear face plate (28) can be opened and closed. The case (27) is formed in a closed rectangular box shape by the upper lid (29), the battery (30) and the charger (31) are housed in the shelf (32) inside the case (27), and the battery meter (33), The key switch (34) and the electric control circuit board (35) are fixed to the unit panel (36), and the panel (36) is detachably fixed to the rear face plate (28) through the mounting hole (37). ing.

Further, as shown in FIG. 6, there are provided forward and reverse and horn switches (38) (39) (40) attached to the operation handle (8), and the forward switch (3)
The forward relay (41) is connected to 8), the reverse switch (39) is connected to the reverse relay (42), and the horn switch (40) is connected to the horn (43). The forward relay (41) normally open switch (44). The electric motor (18) is rotated forward through the normally closed switch (45) of the reverse relay (42), while the normally open switch (46) of the reverse relay (42) is rotated.
And the forward relay (41) normally closed switch (47) to rotate the electric motor (18) in the reverse direction. The forward and backward switches (38) (39) are connected to the speed changeover switch (4).
8), a speed switching timer relay (49) is connected, and a timer switch (51) of the timer relay (49) is connected in parallel to a low speed rotation resistor (50) provided on one pole side of the electric motor (18). Connect the forward / reverse switch (3
8) During operation of (39), the electric motor (18) is rotated at a low speed through the resistor (50) for a predetermined time until the timer switch (51) is turned on, and when the predetermined time has elapsed, the timer switch (51) ) Is turned on and the electric motor (1
8) Rotate at a high speed at a constant speed and run at a low speed for a fixed time at the start of running to prevent meandering due to the dash of the driving rear wheel (19), and turn off the forward / reverse switches (38) (39) to switch each normally closed switch. Both poles of the electric motor (18) are short-circuited via (45) and (47) so that the motor (18) generates electric power during inertial rotation to provide braking force for braking.

As can be seen from FIGS. 1 to 4, the load platform (1) of manual propelling structure, the ram cylinder (4), the hydraulic base (5), the table (10), etc. are utilized. The electrical equipment case (27) is attached to the chevron portion (3) of the luggage carrier (1), and the switches (38) are also provided.
The operation handle (8) having (39) and (40) is mounted, and the traveling unit frame (15) is mounted on the fulcrum shaft (10b) of the table (10) so that it can be freely rolled.
The bracket (21) is welded and fixed to the hydraulic base (5), the rear wheels (17) and (19) are attached to the unit frame (15), the left and right front wheels (2) and (2) and the left and right rear wheels (17). ) (19) supports the luggage carrier (1) by four wheels, and the luggage carrier (1) is pumped by swinging the handle (8) back and forth and the luggage carrier (1) is operated by the pressure release lever (14). 1) Ascending / descending and swinging the handle (8) left and right to change the direction of the driving rear wheel (19) through the steering link (25), and the electric motor (18) reverses the rear wheel (19) in the forward and reverse directions. When the road surface is inclined or the road surface is uneven, the unit frame (15) is rolled around the fulcrum shaft (10b) to drive the rear wheels (1).
9) is moved up and down to follow the slope or unevenness of the road surface.

Further, FIGS. 7 and 8 show another embodiment in which the rear wheels are provided so that they can be freely rolled. FIG. 7 is a perspective view of the carrier, and FIG. 8 is a rear view of the same. Front wheel (5
2) A flat load carrying platform (54) of manual propulsion structure in which (52) is provided and a hand handle (53) is erected at the rear end.
An electric component case (57) having a battery (55), a charger (56), and a unit panel (56a) similar to those in the above-described embodiment is placed on the rear upper surface of the luggage mount (54). Further, similarly to the above-mentioned embodiment, a fulcrum shaft (58) is provided on the rear surface of the luggage carrier (54) so that the fulcrum shaft (5
8) is rotatably inserted into the receiving unit (59), which is integrally fixed to the traveling unit frame (60).
4) via the fulcrum shaft (58) to the unit frame (6
0) is mounted so that it can be rolled freely within the range regulated by the stoppers (61) (61), and a free-rotating rear wheel (62) which can be turned around is mounted on one side of the unit frame (60) and an electric motor (63). ), The drive rear wheel (64) is rotatably attached to the other side of the unit frame (60) through an axle frame (65) rotatable around a vertical axis, and the axle frame (65) is also provided.
The hand handle (66) is erected on the
Forward / reverse switches (67) (68) and horn switch (69) for reversing 3) are attached to the handle (66). Then, the drive rear wheel (64) is turned by swinging the handle (66) left and right, and the switches (6
7) When the electric motor (63) is operated by the operation (68) and the rear wheel (64) is rotated forward and backward to travel forward and backward, when the road surface is inclined or the road surface is uneven, the fulcrum shaft ( The unit frame (60) is rolled around 58) and the driving rear wheel (64) is moved up and down to follow the inclination or unevenness of the road surface.

Further, FIG. 9 shows a modification of FIG. 7, in which the forward / reverse switch (68) is attached to the hand handle (66).
(69) is attached, and a pair of left and right free-moving rear wheels (70) which can change direction are attached to the lower surface of the rear side of the luggage carrier (54) and the bracket (71) on the lower surface of the luggage carrier (54).
Is provided with a receiving cylinder (73) via a pitching fulcrum shaft (72), and the rolling fulcrum shaft (76) is rotatably received within a range regulated by stoppers (74) (75).
The axle frame (65) having the electric motor (63) and the drive wheel (77), and the rolling fulcrum shaft (7).
6), and the drive wheel (77) is grounded at approximately the center of the lower surface of the luggage carrier (54).
The weight (79) is fixed to the arm (5) via the arm (78), and the weight (B) is further separated from the distance (A) between the pitching fulcrum shaft (72) and the drive wheel (77) ground contact position. (79) is provided, the weight of the weight (79) is amplified by the lever action, and the drive wheel (77) is grounded by the pressure, and the drive wheel (77) is centered around each fulcrum shaft (72) (76). Pitching and rolling are made to follow the road surface.

Further, FIG. 10 shows the weight (79) of FIG.
Instead of the gas spring (80), the gas spring (8) is provided substantially parallel to the lower surface side of the luggage carrier (54).
0) is laid horizontally, and one end of the gas spring (80) is connected to the bracket (81) on the lower surface of the luggage carrier (54),
Link (8) to the arm (78) of the axle frame (65)
The other end of the gas spring (80) is connected via (2), and the gas spring (8) amplified by lever action is used.
The drive wheel (77) is grounded by the spring force of (0). In addition, the shaft support of the link (82) and the connection between the arm (78) and the link (82) use a ball bearing joint or the like so that the drive wheel (77) rolls around the fulcrum shaft (76). Are configured.

[0013]

As is apparent from the above embodiments, according to the present invention, the ram cylinder (4) for supporting the luggage carrier (1) is erected, and the hydraulic base (5) is provided in the middle portion of the ram cylinder (4). It is integrally fixed, and a plunger pump (6), an operating handle (8) and an oil tank (7) are provided on the upper side of the hydraulic base (5), and the table (10) is attached to the ram cylinder (4) on the lower surface side of the hydraulic base (5). ) Is rotatably rotatable, and an arm (11) for connecting the front wheel (2) at the front of the luggage carrier (1) downwards is connected to the table (10).
8) A drive rear wheel (19) rotated by means of a drive shaft and a traveling unit frame (15) provided with rotatable left and right rear wheels (17) on both left and right sides, and an axle frame (20) to which the drive rear wheel (19) is mounted. Is rotatably supported on a unit frame (15) about a vertical axis, and the axle frame (20) is connected to a hydraulic base (5) via a steering link (25), and the table (10) lower side Fixed to the ram
Receptor (10a) fitted and held on the outer periphery of the cylinder (4)
The horizontal rolling fulcrum shaft (10b)
If the frame (15) is supported so that it can roll freely
Both are rolling fulcrums of the unit frame (15)
Regulates the maximum amount of rolling around the axis (10b)
Since the stopper (10c) is provided, the ram cylinder (4) and the hydraulic base (5) of the conventional manual propulsion structure are also used, and the drive wheel ( 19) can be installed, the mounting height of the ram cylinder (4) can be made lower than that of the conventional electric propulsion structure, and the combined use of the manual propulsion structure and the four-wheel structure can easily reduce the manufacturing cost. A truck with rear wheels (19) that change direction as well as
Vehicle steering control can also be occupied easily done, and by the front <br/> SL unit frame (15) is rolling on the central pivot axis (10b), to follow the slope or unevenness of a road surface driving The rear wheels (19) can be raised and lowered,
Grounded maintain driving rear wheel (19) in which idle the rear wheel (19) to (slip) can be easily prevented, Table (1
0) Receiver that is firmly installed on the outer periphery of the ram cylinder (4) on the lower side
(10a) Rolling freely, compact and strong
To support the unit frame (15) in good condition
The driving rear wheel (19) is always kept at an appropriate driving ground pressure.
It can be secured and the truck body can be reliably propelled and steering controlled.
Can be made possible and unit frame
When (15) is in an unstable state where it tilts beyond a certain level,
By controlling the upward tilt, workability and safety in this transportation work
It has a remarkable effect such as being able to improve .

[Brief description of drawings]

FIG. 1 is a side view of a ram cylinder section.

FIG. 2 is an overall perspective view.

FIG. 3 is a plan view of the same.

FIG. 4 is a rear view of FIG.

FIG. 5 is an exploded view of an electric component case portion.

FIG. 6 is a control circuit diagram of the electric motor.

FIG. 7 is a perspective view of a carrier showing another embodiment.

FIG. 8 is a rear view of the same.

9 is a side view showing a modified example of FIG. 7. FIG.

FIG. 10 is a side view showing a modified example of FIG.

[Explanation of symbols]

 (1) Luggage stand (2) Front wheel (4) Ram cylinder (5) Hydraulic base (6) Plunger pump (7) Oil tank (8) Operation handle (10) Table (10b) Support shaft (11) Arm (15) ) Travel unit frame (17) Idling rear wheel (18) Electric motor (19) Drive rear wheel (20) Axle frame (25) Steering link

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Nakagawa 263 No. 263, Tangami, Mihara-cho, Minamikawachi-gun, Osaka Pref. Public Sho 63-13060 (JP, Y2)

Claims (1)

[Claims] 1. A ram cylinder for supporting a luggage carrier (1).
(4) is erected, the hydraulic base (5) is integrally fixed to the intermediate portion of the ram cylinder (4) , and the plunger pump (6), the operation handle (8), and the oil tank (7 ) are provided above the hydraulic base (5). ) Is provided, and a table (10) is horizontally rotatably provided on the ram cylinder (4) on the lower surface side of the hydraulic base (5) to allow the front wheel (2) at the front of the luggage carrier (1) to move in and out downward. (11) to the table (10)
In a handlift truck to be connected to a vehicle, a drive unit wheel (19) rotated by an electric motor (18) and a traveling unit frame (15) provided with rotatable left and right rear wheels (17) on both left and right sides are provided. Ring (19)
The axle frame (20) to be mounted is rotatably supported on the unit frame (15) about a vertical axis, and the axle frame (20) is connected to the hydraulic base (5) by a steering link (2 ).
5) and fixed on the lower side of the table (10).
Receiver (1) fitted and held on the outer periphery of the ram cylinder (4)
0a) through the horizontal rolling fulcrum shaft (10b)
The unit frame (15) is supported so that it can be rolled freely.
Rollin of the unit frame (15)
The maximum amount of rolling around the fulcrum axis (10b)
A hand lift truck, which is provided with a stopper (10c) for regulating .