Cutlery – Combined cutlery or combined with ancillary feature – With material-holder or disposal
Reexamination Certificate
1999-08-05
2001-06-05
Rada, Rinaldi I. (Department: 3724)
Cutlery
Combined cutlery or combined with ancillary feature
With material-holder or disposal
C030S162000, C030S296100, C030S517000
Reexamination Certificate
active
06240642
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is in the field of pruning saws.
2. Description of Prior Art
Existing pruning saws with extendable handles are bulky, inconvenient to extend and retract, hazardous to carry and store, and can create noise while being carried or moved. These saws are not appropriate for use in the wilderness by hunters, and animal watchers. Existing pruning saws of all types use clamping devices or screws to secure the blade to the handle. These mechanisms are not convenient for changing blades in a hunter's blind or lookout platform in a tree.
SUMMARY OF THE INVENTION
The objectives of the present invention are provision of a very compact pruning saw that is safe and convenient to store and carry, can be quickly extended for use, and quickly retracted. It should have quick and easy means for attaching the blade to the handle without tools, and should hold a spare blade. It should be silent when carried, so that hunters and animal watchers who may need a small pruning saw to clear a lookout will avoid alerting the animals. It should be resistant enough to shock and damage in its retracted position to survive such activities as backpacking, camping, canoeing, and being dropped to the ground from trees.
The objectives of the present invention are achieved by a collapsible pruning saw with a telescoping series of coaxial nested tubes
1
-
4
that extend to provide an elongated handle. Each inner tube of the series has a back end with a gradual conical flare. Each tube that encloses a smaller tube has a front end with a gradual conical reduction. At full extension the tubes stop and bind against each other, so no clamps or screws are needed. A pruning saw blade
7
is attached to the front end of the innermost tube
4
. The innermost tube is shorter than the outer tube
1
by at least the length of the saw blade, so that all the tubes and the blade retract within the outer tube. Caps
10
and
13
close the outer tube on each end. A resilient damper in each cap presses against the ends of the inner tubes, preventing motion and noise among them. A spare saw blade can be enclosed in the innermost tube
4
. It can be retained in a hole in the back damper
11
, or in a resilient slotted plug in the innermost tube. The front cap
13
preferably includes a direction-finding compass
15
for wilderness use. A threaded bolt
14
or other attachment means preferably extends backward from the back cap for mounting the collapsed saw in a convenient location.
REFERENCES:
patent: Re. 34358 (1993-08-01), Miller
patent: 527240 (1894-10-01), Garies
patent: 1611886 (1926-12-01), Champlin
patent: 3861494 (1975-01-01), Grego
patent: 4654971 (1987-04-01), Fettes et al.
patent: 4669186 (1987-06-01), Liu
patent: 4823468 (1989-04-01), Kollogger
patent: 5228202 (1993-07-01), Liao
patent: 5569282 (1996-10-01), Werner
patent: 5842301 (1998-12-01), Cassem
patent: 5911481 (1999-06-01), Yost
Hall Melissa L.
Rada Rinaldi I.
Stewart John V.
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