Material or article handling – Elevator or hoist and loading or unloading means therefor – Return – buffer – or counterweight feature
Patent
1997-07-18
2000-02-22
Werner, Frank E.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Return, buffer, or counterweight feature
414667, 414671, 414631, 414629, 414584, 414401, 184222, B66B 920
Patent
active
060273038
ABSTRACT:
A lift truck, especially for lifting boats, includes a self-propelled main frame having a pair of parallel rails extending in a fore-and-aft direction. The main frame is supported by front drive wheels and rear castor wheels. A mast is movable forwardly and rearwardly on the rails and carries a lift assembly that can pivot about a transverse axis. The lift assembly includes a pair of lift arms each having vertical and horizontal portions. The vertical portions are mounted to swing about respective fore-and-aft axes, and are horizontally movable toward and away from one another for increasing or decreasing the distance between those axes. The main frame does not carry a counterbalance weight, but rather has a latch which grips a ground-mounted anchor for anchoring the rear end of the main frame during vertical movement of the lift assembly.
REFERENCES:
patent: 1277214 (1918-08-01), Hoster
patent: 1307448 (1919-06-01), Lerch
patent: 2992751 (1961-07-01), Quayle
patent: 3754512 (1973-08-01), Kmety
patent: 4921075 (1990-05-01), Schumacher et al.
patent: 5374156 (1994-12-01), Simpson et al.
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