Knapsack type working machine

Details Knapsack type working machine Knapsack type working machine

1998-06-24

2000-04-25

Vo, Peter

Tool driving or impacting

With means engaged by part of human other than hand

302961, 173171, 224634, B26B 2700

Patent

active

060532599

ABSTRACT:
A knapsack type working machine has a first frame and a second frame. A prime mover for driving a working instrument is carried on the first frame. The second frame has a back pad and shoulder straps. The first frame and the second frame are separable from each other. The first frame has a locking engagement member. The second frame engages with the locking engagement member and has a pivotal locking member urged by a spring in a direction of engagement with the locking engagement member. By releasing the locking engagement member from engagement with the pivotal locking member, the first frame is separated from the second frame.

REFERENCES:
patent: 1981076 (1934-11-01), Sells
patent: 3219129 (1965-11-01), Yamada
patent: 3540123 (1970-11-01), Yamada
patent: 3854204 (1974-12-01), Gonzales, Jr.
patent: 4145028 (1979-03-01), Kelley et al.
patent: 4213276 (1980-07-01), Jennings
patent: 4483070 (1984-11-01), Junkermann
patent: 4572414 (1986-02-01), Blatt
patent: 4662551 (1987-05-01), Dudley et al.
patent: 4989323 (1991-02-01), Casper et al.
patent: 5829874 (1998-11-01), Breeding
Communication from European Patent Office and attached Search Report, Oct. 21, 1998.

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