DE2115851A1 - Lifting vehicle with loading fork - Google Patents

Description

PATENT Attorney DIPL.-ING. JOACHIM STREET HC HANAU · KOMERSTR. If · PO Box 7 »S · TELtMW TELEQRAMME: HANAUPATENT · TELEXs 4 IMTM p * t P O T Λ I N Hanau, March 31, 1971 Societe Anonyme _{Zo / Me} . _{1Q 6Q3}

CHEVILLY LARÜE France

HebefahrzGug with loading fork

The present invention relates to an idle vehicle for moving loads with a chassis carried by front and rear wheels which receives a movable joint unit controlled by screw jacks with a lattice loading fork.

A lifting vehicle or forklift of known construction has a vertical mast at the front along which a platform or loading fork can be raised or lowered. Oieae device has, inter alia, the disadvantages that on the one hand, the fork can only be moved vertically along the mast and, on the other hand, the extent of this displacement the height of the mast is limited, which defines the space required by the device. Furthermore, the presence of the mast and the guide organs in the boom is limited in front of the Chassis of the forklift significantly exceeds the maximum weight permitted as payload.

Such a forklift truck must be lifted vertically 3oiner loading fork with the load, for example along a

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Tusks or a stack of goods, inagesamt are moved to the To move the fork with its load before the latter can be deposited on top of the stack. This process is at heavy loads dangerous if they are lifted to great heights at the front of the forklift and the floor, on which the vehicle is moving is uneven. Another disadvantage is that the use of stabilizers fixing the chassis of the forklift to the ground is not possible,

Eg the object of the present invention is a lifting vehicle to create where the loading fork is horizontal and vertical is kept constant, regardless of the position of the actuators.

The solution to this problem is that the joint unit a support bracket that can be moved back and forth on the chassis, a boom articulated at the top of the support bracket as well as having an arm articulated to this, one of which End is connected to the grid loading fork, which in turn still has an extendable arrangement on a hinge axis of the Boom is articulated, creating a constant horizontal cladding the loading fork, regardless of the position and direction of the movable elements, is possible.

In a further embodiment of the invention, a telescopic boom is provided with a boom base and a boom tip that can be retracted into it, the boom base being articulated on a hinge axis of the boom bracket and connected to the boom bracket via a screw jack and the boom tip receiving a screw jack and the hinge axis. The synchronization between the screw jacks can take place in various ways, for example mechanically or hydraulically.

The arrangement for keeping the alignment of the grid

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BAD OBiGlNAL

Loading fork is preferably a screw jack which is hinged to the grid loading fork and to the arm, the Control of the scrolls is carried out via hydraulic control elements, which automatically control the movement of the screw jack with the screw jacks that control the boom and arm synchronize.

The length of the boom and arm and the height of the joint axis of the boom above the chassis on the support frame are advantageously chosen in such a way that a touchdown the nitter loading rack either above the axles of the front wheels on the chassis or directly in front of the front wheels ™ at a level below the level of the wheels is.

The invention is explained below with reference to the in the drawing illustrated AusfüSarungsbeispiels explained in more detail.

Cs show:

Fig. 1 shows a section through a forklift vehicle with lowered! Loading fork and

Fig. 2 shows the forklift truck with the boom extended.

The vehicle shown in Fig. 1 and 2 has a chassis, which on front drive wheels 2 and on rear Steering wheels 3 is placed. On the chassis I slide rails 4 are arranged: on which a movable support block is located 5 builds up. This can be moved forwards or backwards on the slide rails 4, as shown by the double arrow in FIG Fig. 2 indicates.

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At the tip of the support block 5, a transverse axis 7 is provided, to which an alignable arm 8 is articulated. The boom 8 has an axis 9 at the front to which an arm 10 is articulated. The arm 10 points to the side of the axis 9 an axis 11, which has an additional screw winch 12 with an axis 13 of the boom 8 is connected. This axis 13 is via a main screw jack 14 with an axis 15 of the support bracket 5 connected.

At the end opposite the axis 11, the arm 10 carries an axis 16 to which the lower part of a lattice loading fork is attached 17 known type is hinged. Above the axis 16, the grid loading fork 17 is provided with a further hinge axis 18, which is connected to the axle 9 via an adjusting screw jack 19.

The device works in the following way:

Ea can be seen that by lengthening the main screw jack 14 the boom 8 is raised about the axis 7, as the arrow 20 in FIG. 2 shows. By pulling in at the same time the additional screw jack 12, the arm Io is raised in relation to the boom 8 about the axis 9 (Flg. 2, arrow 21). The direction of the fork 17 is kept constant by extending the screw jack 19, for example horizontally. It is sufficient to operate the device to synchronize the three screw jacks 12, 14 and 19. This synchronization can be done with With the help of known devices, not shown, which are manually operated or work automatically. That is enough it is to connect the three screw jacks 12, 14 and 19 to a common hydraulic control distributor. By moving of the support block 5 on the slide 4, it is possible to move the load carried by the fork 17 horizontally into the position shown in Fig. With dashed lines, wherein the chassis 1 and the wheels 2 and 3 are fixed. Especially

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Otherwise, this device does not allow the use of stabilizers shown, which are supported on the ground and ensure extensive stability during operation, even when a heavy load is moved high above the ground.

Furthermore, it can be seen from Fig. 1 that the platform of the fork 17 can be below the level of the wheels 2 and 3, whereby it is possible to move loads which are located immediately in front of the wheels 2. These loads can be loaded or unloaded by simply pushing the support frame 5 forwards or backwards on the slide rails 4 without moving the chassis 1; From Fig. 2 it can be seen that the platform can also be withdrawn between the wheels 2 and 3 of the axles above the wheels.

It is also possible to use a telescopic boom which has a boom foot which is attached to the axis 7 is articulated and the screw jack 14 receives and a boom tip that can be pushed into the boom and the Elements 9 and 12 accommodates.

Claims: M

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Claims (4)

- 6 - Claims: 1. J ile vehicle for moving loads with a front and rear wheels supported chassis, which has a movable, by screw jacks controlled joint unit with a lattice loading fork, characterized that the joint unit has a support frame (5) which can be moved back and forth on the chassis (1), has a boom (8) hinged to the top of the support frame (5) and an arm (10) hinged to it, one end of which is connected to the grid loading fork (17), which in turn has an extendable Arrangement is articulated on a hinge axis (9) of the boom (8), whereby a constant horizontal position of the Loading fork (17), regardless of the position and direction of the movable elements, is possible. 2. Ilebefahrzeug according to claim 1, characterized in that that a telescopic boom with a boom foot and a boom tip that can be retracted into this is provided, the boom foot being articulated on a hinge axis (7) of the boom bracket (5) and over a screw jack (14) is connected to the boom bracket (5) and the boom tip receives a screw jack (12) and the hinge axis (9). 3. Lifting vehicle according to one of the two claims 1 and 2, characterized in that the arrangement for keeping the alignment of the grid loading fork constant (17) is a screw jack (19) which is hinged to the grid loading fork (17) and to the arm (10), the control of the screw jack (19) takes place via hydraulic control elements, which automatically control the movement 109343/1240 Synchronize the flow of the screw jack (19) with the screw jacks (14, 12) controlling the boom (8) and arm (10). 4. Ilebef ahrzeug according to one or more of the above Claims 1 to 3, characterized in that the length of the boom (8) and the arm (10) and the height of the hinge axis (7) of the boom (81 above the chassis (1) on the support block (5) are selected such that the grid-Iiadegabel (17) is placed on either above the axles of the front wheels (2) on the chassis (1) or lying directly in front of the front wheels (2) at a level below the level of the wheels (2) and (3) is. 109843/1240 Blank page