Material or article handling – Elevator or hoist and loading or unloading means therefor – Elevator wherein means comprises guide mounted for relative...
Reexamination Certificate
1999-10-04
2001-08-14
Olszewski, Robert P. (Department: 2167)
Material or article handling
Elevator or hoist and loading or unloading means therefor
Elevator wherein means comprises guide mounted for relative...
C414S620000, C414S642000, C187S223000, C187S224000
Reexamination Certificate
active
06273669
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a load handling apparatus for a counterbalance type forklift in which actions of lifting and lowering a fork, and tilting a mast are conducted by means of a single operating lever for handling a load. The load handling apparatus is configured so as to prevent the action condition from being suddenly changed by an erroneous operation, thereby improving safety.
2. Description of the Related Art
In a conventional counterbalance type forklift in which actions of lifting and lowering a fork, and tilting a mast are conducted by means of a single operating lever for handling a load. In such a counterbalance type forklift, a push button switch is disposed on the load operating lever, and an operation of only the load operating lever and that of both the load operating lever and the push button switch are selectively employed. When, during a period when both the load operating lever and the push button switch are operated, the push button switch is released by any reason, therefore, the action condition intended by the driver is suddenly changed to that not intended by the driver, thereby producing a problem in that the driver may receive any injury.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a load handling apparatus for a counterbalance type forklift which prevents the above defects with the conventional apparatus.
To achieve the above object, according to the present invention, there is provided a load handling apparatus for a counterbalance type forklift in which a tiltable operating lever is disposed on a body of the forklift, a mast which is tiltable in an anteroposterior direction is disposed on the forklift, a liftable fork is disposed on the mast, and a tilting speed of the mast and lifting and lowering speeds of the fork are controlled by a degree of opening of a solenoid proportional control valve, the degree of opening being proportional to a tilting angle of the operating lever, wherein a number of the operating lever disposed on the body is one, a switch is attached to the operating lever, and the apparatus comprises a controller which performs controls in the following manner: when the operating lever is tilted under a state where the switch is operated, a signal for tilting the mast is output; when only the operating lever is operated, a signal for lifting or lowering the fork is output; and, when the switch is changed to a inactive condition under a state where the operating lever is in an tilting operation condition, actions of lifting and lowering the fork are disabled unless the operating lever is returned to a neutral condition.
REFERENCES:
patent: 4097791 (1978-06-01), Bivens et al.
patent: 4757712 (1988-07-01), Jurca
patent: 5238086 (1993-08-01), Aoki et al.
patent: 63-293230 (1988-11-01), None
patent: 3-240113 (1991-10-01), None
patent: 4-365798 (1992-12-01), None
patent: 8-268696 (1996-10-01), None
patent: 8-282994 (1996-10-01), None
patent: 11-092099 (1999-04-01), None
Nippon Yusoki Co., Ltd.
O'Connor Gerald J.
Olszewski Robert P.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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