Tree pruner

Details Tree pruner Tree pruner

2001-06-28

2002-05-14

Payer, Hwel-Slu (Department: 3724)

Cutlery

Cutting tools

Plural cooperating blades

C030S245000

Reexamination Certificate

active

06385852

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a gardening implement, and more particularly to a tree pruner.
2. Description of Related Art
As shown in
FIG. 1
, a tree pruner of the prior art comprises a fixation seat
10
and a link rod
30
. The fixation seat
10
is provided at the bottom end with a connection portion
11
which is fastened with a rod
20
, and is provided with a first pulley set
12
. The fixation seat
10
is provided at the top end with a hook
13
and a blade
14
pivoted thereto. The hook
13
is connected at the top end with one end of a tension spring
15
. The link rod
30
is pivoted at the bottom end with the fixation seat
10
and the blade
14
and is provided with a second pulley set
31
. A pull cord
32
runs through the first pulley set
12
and the second pulley set
31
. The link rod
30
is connected at the top end with the top end of the tension spring
15
. In operation, the pull cord
32
is pulled to actuate the link rod
30
to turn on a pivot
33
on which the blade
14
is pivotally mounted. As the link rod
30
is actuated to turn, the blade
14
works to sever a tree twig in conjunction with the hook
13
. The application arm between the pivot
33
and the second pulley set
31
is relatively long and is devoid of any reinforcing structure, thereby undermining the overall efficiency of the prior art tree pruner. In other words, the user of the prior art tree pruner often fails to sever the tree twig in one try. When the pull cord
32
is pulled for the second time in an effort to sever the tree twig, the action stroke of the second application is lengthened in view of the recovery action of the tension spring
15
on the link rod
30
, thereby resulting in the disengagement of the blade
14
from the tree twig.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a tree pruner which is free of the deficiencies of the prior art tree pruner described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a tree pruner comprising a fixation seat, a cutter, a link rod, and an auxiliary rod member. The auxiliary rod member is formed of a support rod and an expandable push rod. The support rod is pivoted at one end with the link rod, and at the other end with an extension arm of the cutter. The expandable push rod is pivoted at one end with the link rod, and at the other end with the support rod. The auxiliary rod member serves to enhance the structural rigidity of the link rod, so as to improve the efficiency of the tree pruner.
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings.


REFERENCES:
patent: 4760645 (1988-08-01), Davis
patent: 5743018 (1998-04-01), Wang
patent: 5745998 (1998-05-01), Le et al.
patent: 5970617 (1999-10-01), Chang
patent: 5996232 (1999-12-01), Lin

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