Cutlery – Cutting tools – Saw
Reexamination Certificate
2002-03-05
2004-03-02
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Saw
C030S383000
Reexamination Certificate
active
06698101
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a chain saw, and more particularly to a low-vibration and low-noise guide plate assembly for a chain saw, which includes a porous middle plate and two porous side plates that define a guide groove thereamong for running of an endless saw chain.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional chain saw
1
is shown to include a housing
2
, a guide plate assembly
3
, a driving gear
4
, a guide sprocket
5
, and a saw chain
6
. The guide plate assembly
3
is connected fixedly to the housing
2
, and has a middle plate
301
and two side plates
302
. The middle plate
301
is sandwiched and fixed between the side plates
302
. The outer peripheries of the middle plate
301
and the side plates
302
define a guide groove
303
thereamong for running of the saw chain
6
around the middle plate
301
. The driving gear
4
is mounted rotatably on the housing
2
. The guide sprocket
5
is mounted rotatably between the side plates
302
. The saw chain
6
has a serrated inner peripheral portion
601
trained between the driving gear
4
and the guide sprocket
5
, a plurality of aligned pairs of wings
602
, and an outer peripheral saw blade unit
603
. Each pair of the wings
602
are attached respectively to two opposite sides of the inner peripheral portion
601
, and contact the outer peripheries of the side plates
302
. As such, when the driving gear
4
rotates, the saw chain
6
runs within the guide groove
303
and around the middle plate
301
.
The aforesaid conventional chain saw
1
suffers from the following disadvantages:
(1) There is no vibration-absorbing means associated with the guide plate assembly
3
, thereby creating significant vibration of the saw chain
6
during operation that will result in loud noise, difficulty in handling the chain saw
1
, and damage to the guide plate assembly
3
and the saw chain
6
.
(2) Because the guide plate assembly
3
is relatively heavy, it is difficult to hold the chain saw
1
during operation.
SUMMARY OF THE INVENTION
An object of this invention is to provide a guide plate assembly for a chain saw, which has a vibration-absorbing design that can reduce the vibration of a saw chain.
Another object of this invention is to provide a lightweight guide plate assembly for a chain saw.
According to this invention, a guide plate assembly for a chain saw includes a middle plate that is sandwiched and fixed between two side plates so as to define a guide groove among outer peripheries of the middle plate and the side plates. A saw chain can run within the guide groove. The middle plate has a plurality of first holes formed therethrough. Each of the side plates has a plurality of second holes formed therethrough that are aligned and communicated with the first holes in the middle plate. Because the middle plate and the side plates are porous, they can absorb vibration transmitted from the saw chain during operation. Furthermore, the weight of the guide plate assembly is reduced due to the presence of the first and second holes.
REFERENCES:
patent: 5845402 (1998-12-01), Leini
Chen Kuen-Yan
Merchant & Gould P.C.
Watts Douglas D.
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