Force-saving pruner with a guiding roller arrangement

Details Force-saving pruner with a guiding roller arrangement Force-saving pruner with a guiding roller arrangement

2001-06-08

2002-10-29

Watts, Douglas D. (Department: 3724)

Cutlery

Cutting tools

Plural cooperating blades

C030S188000

Reexamination Certificate

active

06470575

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a force-saving pruner that utilizes a guiding roller arrangement to accomplish cutting of an object by one cut.
2. Description of the Related Art
FIG. 1
of the drawings illustrates a conventional pruner comprising a first handle
10
and a second handle
11
that are pivoted together at a pivot
12
. A jaw
13
is formed on an end of the first handle
10
and includes a hollow mediate portion through which a cutter
14
is extended. The cutter
14
includes a first end for performing a cutting operation together with the jaw
13
and includes a second end having a slot
17
. A transverse member
15
includes a first end
16
slidably received in the slot
17
and a second end to which an end of a spring
18
is attached, the other end of the spring
18
being attached to the cutter
14
. Thus, when the first and second handles
10
and
11
are pivoted relative to each other, the cutter
14
is moved, and the first end
16
of the transverse member
15
translates along the slot
17
.
The first end
16
of the transverse member
15
in
FIG. 1
is located in an end of the slot
17
before cutting. When the user applies a force to move the first and second handles
10
and
11
toward each other, the cutter
14
cuts an object
19
between the cutter
14
and the jaw
13
by about one-third (⅓) of the object
19
, as illustrated in
FIG. 2
, yet it is difficult to continue cutting in this state. The user must move the first and second handles
10
and
11
slightly away from each other for the next cutting. The cutting procedure repeats until the object
19
is completely cut, while the first end
16
of the transverse member
15
is moved to the other end of the slot
17
, as illustrated in FIG.
3
. Thus, a force-saving operation is provided during pruning. However, it takes at least two cutting operations to completely cut the object to be cut, and each time the user must move the handles
10
and
11
away from each other for the next cutting. The cutting operation is inconvenient and time consuming. The end face of the object after cutting is not flush.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a force-saving pruner that utilizes a guiding roller arrangement to accomplish cutting of an object by one cut.
In a preferred embodiment of the invention, a pruner comprises a first handle comprising a jaw on a first end thereof and a handle portion on a second end thereof, a second handle having an end pivotally mounted to the first handle, a first roller and a second roller rotatably mounted in the second handle and each including an outer periphery, and a cutter comprising a first end that cooperates with the jaw for performing a cutting function and a second end having a sliding portion. The cutter has an intermediate portion that is pivotally connected to the intermediate portion of the first handle.
The sliding portion of the cutter moves along a path during relative pivotal movement between the first handle and the second handle. A portion of the outer periphery of the first roller and a portion of the outer periphery of the second roller are located in the moving path of the sliding portion of the cutter for guiding the sliding portion of the cutter during the relative pivotal movement between the first handle and the second handle.
The portion of the outer periphery of each of the first roller and the second roller is beyond an inner side of the second handle. The outer periphery of each of the first roller and the second roller comprises an annular groove defined therein. The sliding portion of the cutter is in contact with at least one of a bottom wall defining the annular groove of the first roller and a bottom wall defining the annular groove of the second roller. Cutting of an object between the first end of the cutter and the jaw of the first handle is accomplished by one cut.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 113670 (1871-04-01), Howell
patent: 2385835 (1945-10-01), Neal
patent: 4058893 (1977-11-01), Boyajian
patent: 4249308 (1981-02-01), Boyajian

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