JPH0699863A - Hand lift truck - Google Patents

Abstract

PURPOSE:To enable the combined use of a ram cylinder, a hydraulic base, and the like conventionally used for manual propulsion structure, allow driving wheels to be mounted by simple working such as the welding of a unit frame, enable the fitting height of the ram cylinder to be lower compared to the conventional motor-driven propulsion structure, and reduce the manufacturing cost by the combined use of manual propulsion structure and also by four-wheel structure. CONSTITUTION:In a hand lift truck, a table 10 is provided in the horizontally rotatable state at an erected ram cylinder 4 on the lower face side of a hydraulic base 5 integrally fixed to the intermediate part of the ram cylinder 4 for supporting a load placing base 1, and an arm 11 with a front wheel protruding downward at the front part of the load placing base 1 is connected to the table 1. A travel unit frame 15 is integrally fixed to the table 10, and a rotatory- driving rear wheel 19 rotated by an electric motor 18 and a rotatable idling rear wheel are provided on either side of the unit frame 15. An axle frame 20 fitted with the driving rear wheel 19 is journalled to the unit frame in such a way as to be rotatable around a vertical axis, and the axle frame 20 can be connected to a hydraulic base through a steering link.

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 part of the luggage platform downward is connected to the table. The driving unit frame is integrally fixed, and drive rear wheels that are rotated by an electric motor and rotatable idle rear wheels are provided on both sides of the unit frame, and an axle frame for mounting the drive rear wheels is a unit that is rotatable about a vertical axis. The axle frame is pivotally supported, and the axle frame is connected to the hydraulic base via a steering link. This is because the ram cylinder of the conventional manual propulsion structure and hydraulic base are also used, and drive wheels can be installed by simple processing such as welding of the unit frame, and the mounting height of the ram cylinder is higher than that of the conventional electric propulsion structure. In addition to lowering the manufacturing cost, the manual propulsion structure can be used in combination and the four-wheel structure can easily reduce the manufacturing cost.

[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, the traveling unit frame (15) is integrally fixed to the table (10), and the direction-changeable idle rear wheel (17) provided with a brake pedal (16) is provided. A drive rear wheel (19) mounted on one side of the unit frame (15) and rotated by an electric motor (18) is connected to the other side of the unit frame (15) via an axle frame (20) rotatable about a vertical axis. The steering link (25) is connected to the bracket (21) of the hydraulic base (5) and the bracket (22) of the axle frame (20) through the pins (23) and (24). , The axle frame (20) is connected to the hydraulic base (5) via the steering link (25), and is provided around the steering axis of the rear wheel (19) provided on the axle frame (20). (26a), or a stopper for restricting the horizontal rotation of the bracket (21) (26b) (2
Within the range of 6b), 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 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, the traveling unit frame (15) is fixed to the table (10) by welding, and the bracket (21) is fixed to the hydraulic base (5) by welding. The wheels (17) and (19) are attached to the unit frame (15), and the left and right front wheels (2) and (2) and the left and right rear wheels (17) and (19) support the luggage carrier (1). The baggage platform (1) is moved up and down by the pumping operation of the plunger pump (6) and the depressurization lever (14) by swinging the handle (8) forward and backward, and the handle (8) is swung left and right. The driving rear wheel (19) is turned around via the directional link (25), and the electric motor (18) causes the rear wheel (19) to rotate forward and backward to travel forward and backward.

[0010]

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 horizontally rotatable, and an arm (11) for connecting the front wheel (2) at the front of the luggage carrier (1) downward is connected to the table (10) in the handlift truck. A traveling rear unit wheel (15) is integrally fixed, and a drive rear wheel (19) rotated by an electric motor (18) and a freely rotatable rear rear wheel (17) are provided on both sides of the unit frame (15). Only the rear drive wheel (1
9) The axle frame (20) for mounting is rotatably supported on the unit frame (15) about a vertical axis, and the axle frame (20) is attached to the hydraulic base (5) through a steering link (25). By connecting them, the ram cylinder (4) and hydraulic base (5) of the conventional manual propulsion structure can be used together, and the drive wheel (19) can be installed by simple processing such as welding of the unit frame (15), As compared with the conventional electric propulsion structure, the mounting height of the ram cylinder (4) can be made lower, and the manual propulsion structure can be combined with the four-wheel structure to easily reduce the manufacturing cost.

[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.

[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 (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, Tanue, Mihara Town, Minamikawachi District, Osaka Prefecture

Claims (1)

[Claims] 1. A ram cylinder for supporting a luggage platform is erected, a hydraulic base is integrally fixed to an intermediate portion of the ram cylinder, a plunger pump, an operation handle and an oil tank are provided on an upper side of the hydraulic base, and a lower surface of the hydraulic base is provided. In a hand lift truck in which a table is horizontally rotatably provided on a side ram cylinder and an arm for moving a front wheel of a front portion of a luggage platform downward is connected to the table, a traveling unit frame is integrally fixed to the table, and an electric motor is used. Drive rear wheels to be rotated by and free rotatable rear wheels are provided on both sides of the unit frame, and the axle frame to which the drive rear wheels are attached is rotatably supported on the unit frame about a vertical axis. A hand lift tiger characterized by being connected to a hydraulic base via a steering link. Kook.