A brush is attachable to the top edge of a chain saw blade and is used
to remove saw dust and clogged debris from a chain saw cut. Two
brackets attached to the blade and the motor cover support an
expandible bar that carries the bristles. An agitator is attached to
the bristle carrying bar and includes a pair of rollers adapted to
contact the moving chain. The brush is employed to clean the chain saw
cut in order to keep the saw from binding or becoming gummed up with
saw dust. The agitator may be selectively employed depending upon the
difficulty of the cleaning task.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a cleaning device attachable to a chain saw
for the purpose of cleaning chain saw cuts.
2. Description of the Related Art
The problem of keeping saw blades clean has received some attention in
the prior art. For example, U.S. Pat. Nos. 109,436 and 417,093 disclose
brush attachments used for cleaning the teeth of band saws and circular
saws respectively. In those cases the brushes contact the saw teeth
directly and not the cut made by the saw teeth. The foregoing
represents efforts to keep old fashioned, non-portable saws from
becoming sawdust bound.
Over the last few decades, with the advent of the chain saw, the
problem of keeping the saw clean has become more acute. There are
basically two problems. The first problem is that saw dust clogs the
chain saw motor and decreases the efficiency of the cutting teeth. The
second, and more important problem, is that saw dust stuck in the chain
saw cut will cause the chain to snag in the cut. On occasion, this can
have serious, if not fatal, consequences. Insofar as can be determined,
no serious effort has been made to attack this problem directly even
though there have been several indirect attempts. For example, U.S.
Pat. No. 4,193,193 describes a guard for a chain saw which is intended
to keep individuals from getting hurt if the chain should grab.
U.S. Pat. No. 4,211,007 describes a method for decreasing the saw dust
problem. That method comprehends the use of two saw dust knock-out
holes in the rear of the guide bar.
The concept of attachments for chain saws is known though not widely
used. For example, it is known to use self lubricating devices in order
to keep a chain saw oiled.
Lastly, efforts have been made to improve the structure of a chain saw
in order to minimize the chance of saw dust clogging. See, in
particular, U.S. Pat. Nos. 3,829,971 and 4,530,679. In each case the
prior art appears to attack the symptom of the problem rather than deal
with the problem directly.
SUMMARY OF THE INVENTION
Briefly described the invention comprises a brush device attachable to
the top edge of a chain saw blade and used to remove saw dust and
clogged debris from a chain saw cut. A pair of brackets are mounted on
the chain saw blade and the motor cover in such a fashion as to give
the chain clearance to pass there through. The two brackets carry an
expandible bar which in turn supports a row of relatively stiff long
bristles. The two mounting brackets permit the bar to wiggle or vibrate
a little bit in a direction substantially parallel to the long
dimension of the chain saw blade. An optional agitator mechanism is
attached to the bar and adapted to contact the underside of the moving
chain. A saw chain typically includes a row of teeth carried on links
having hour glass shapes. A pair of rollers attached to the underside
of the agitator rides on the bottom side of the chain in such a fashion
as to couple agitating motion to the resilient bar thereby causing the
bristles to vibrate. The agitator is an optional feature depending upon
the severity of the cut clogging problem. These and other features of
the invention will be more fully appreciated by referring to the
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the preferred embodiment of the
invention shown as the chain saw makes a typical chain saw cut.
FIG. 1A is a detailed perspective view of the front mounting bracket.
FIG. 1B is a detailed perspective view of the second mounting bracket
shown attached to the motor cover and the bar length adjustment
FIG. 2 shows the preferred embodiment of the invention as employed to
clear a chain saw cut.
FIG. 3 is a cross sectional view of the agitator mechanism illustrating
the manner in which the rollers thereof contact the moving underside of
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
During the course of the description like numbers will be used to
describe like features as found in the various figures which illustrate
The preferred embodiment of the invention 10 is illustrated attached to
a conventional chain saw 12 in FIG. 1. The hands 14 of the chain saw
operator guide the blade 18 and moving chain 20 into the cut 60 in log
16. The chain 20 normally moves away from the chassis 38 on the
underside of blade 18 in the direction of arrow 36 and toward chassis
38 on the top side of blade 18 in the direction of arrow 34.
The invention 10 essentially comprises a plurality of brush bristles 62
forming a brush 22 carried on a resilient bar 24 supported by the front
end by a front bracket 26 and at the rear end by a chassis mounted rear
bracket 40 attached to motor cover 38. Rear bracket 40 is attached by
metal screws 42 to the metal case 38 of the chassis of the chain saw
12. Front bracket 26 is attached to blade 18 by a pair of U-shaped
mounting blocks 30 located on opposite sides of the blade 18. A metal
pin or rivet 28 passes through the two blocks 30 and the blade 18 and
serves to support the two vertical arms of the front mounting bracket
26. Pin 28 is important because it holds the bracket 26 in place yet
permits it to wriggle and vibrate a bit in order to accommodate the
backward and forward motion of the brush 22. The two vertical arms of
the bracket 26 support a horizontal cross member 32 which in turn
supports the resilient bar 24. Brush bristles 22 are preferably made
from a hard plastic material such as Nylon®. Bristles 22 may vary
in length from between 1/2 of an inch to 2 inches but are preferably in
the neighborhood of 1 inch. The width of the brush bristles 22 should
not exceed the width of the chain 20 as shown in FIG. 3. Accordingly
the width of the pile of the brush bristles 22 would normally not
exceed 1/4 of an inch. A length adjusting and vibration compensating
mechanism is illustrated in FIG. 1B. The resilient carrying bar 24
includes a slot 44 therein adapted to receive a threaded stud 46
secured loosely in place by a threaded nut 48. The length adjuster
serves two purposes. First, it permits the cut cleaning apparatus 10 to
be attached to chain saws of various sizes. It is well known that chain
saw are available in a variety of sizes ranging from approximately 12
inches for small home saws up to 26 inches or more for industrial
lumbering equipment. Second, the length adjuster also permits a modest
amount of resilient give in the mechanism so that the resilient bar
does not absorb all of the stress of the cleaning activity.
The invention is normally used to make a cut 60 in a piece of wood 16
in the conventional fashion as shown in FIG. 1. After the cut is made
the chain saw 12 is typically inverted, so that the top portion of the
blade is facing downward. The brush bristles 62 are then placed in the
cut 60 and moved back and forth to clear the debris out of the cut 60.
This is typically down when the cut 60 is sufficiently deep to cause
the chain saw to begin to bind. An experienced chain saw operator can
tell by the feel and sound of the chain saw 12 if the chain saw 12 is
having difficulty cutting through wood due to the accumulation of saw
dust in the cut 60 or on the saw itself. This problem is frequently
associated with soft gummy woods such as white pine but is probably a
problem with other woods too, depending upon their moisture content,
sap characteristics, size, time of year, and the nature of the nature
of the chain saw being used.
If the brush 22 tends to bind in cut 60 or if it doesn't do an adequate
job of clearing the debris, then the agitator attachment 50 may be
employed to enhance the cleaning characteristics of the brush bristles
62. Agitator 50 comprises a pair of U-shaped arms 52 which attach the
carrying bar 24 to a pair of rollers 54 located on opposite sides of
blade 18. A typical saw chain 20 includes a plurality of links which
carry the teeth on one side and are normally bare on the other. The
links have an hour glass shape such that as they pass over rollers 54
they cause the arms 52 to vibrate carrying bar 24 which in turn
vibrates brush bristles 62. Therefore, the lumpy shape of the underside
of the chain 20 causes the agitator 50 to vibrate the bristles 62 both
up and down and back and forth. The up and down motion comes from the
lumpy nature of the underside of the chain 20. The back and forth
motion comes from the fact that the chain is traveling in direction 34
thereby causing the rollers 54 to be carried in that direction for a
short period of time and then spring back due to the resilience of the
bracket 26 and carrying bar 24.
Normally, if the invention 10 is used without the agitator 50, it is
not necessary to turn on the chain saw 12. However, for those difficult
situations where enhanced cut cleaning is necessary, the use of
agitator 50 can be employed. Use of agitator 50 requires that the chain
saw 12 be turned on and turned upside down or sidewise with respect to
its normal attitude. This circumstance is acceptable for short periods
of time with most chain saws and is not a problem if the cut 60 is
horizontal rather than vertical as shown in FIGS. 1 and 2.
While the invention has been described with reference to the preferred
embodiment thereof it will be appreciated by those of ordinary skill in
the art that various changes can be made to the structure and parts of
the invention without departing from the spirit and scope of the
invention as a whole.
1. A chain saw cut cleaning apparatus for use with a chain saw having a
saw blade, said apparatus comprising:
cleaning means for cleaning out a chain saw cut, said cleaning means
comprising a brush including bristles and a bristle carrying bar for
supporting said bristles;
a bracket means attached to said bristle carrying bar of said cleaning
means for attaching said cleaning means to said chain saw; and,
agitator means attached to said brush for agitating said brush.
2. A chain saw cut cleaning apparatus comprising:
a brush including bristles and a bristle carrying bar means for
supporting said bristles;
a bracket means for attaching said brush to said chain saw; and,
agitator means attached to said brush for agitating said brush.
3. A chain saw cut cleaning apparatus for use with a chain saw having a
saw blade and a chain used to cut wood, said apparatus comprising:
a bristle carrying bar attached to said brush bristles; and,
bracket means for attaching said bristle carrying bar to said chain saw;
wherein said bristle carrying bar and said brush bristles are located
in substantially the same plane as said chain saw blade and on the
opposite edge thereof from the side of said chain saw blade that makes
cutting contact with the wood to be cut.
4. The apparatus of claim 1 wherein said agitator means include chain
contacting means for transmitting agitating motion through said
agitator means to said brush.
5. The apparatus of claim 4 wherein said bracket means comprise:
a front bracket attachable to said saw blade, said front bracket
including two arms on opposite side of said saw blade and a horizontal
member connected to said arms in such a fashion as to straddle the
chain and provide enough clearance so that it can pass easily there
through, said horizontal member being connected to said
bristle-carrying bar, and,
a rear bracket means for attaching the rear portion of said
bristle-carrying bar to the chassis of said chain saw.
6. The apparatus of chain 5 wherein the chain contacting means of said
agitator means comprises a pair of rollers which contact the underside
of said saw chain opposite the saw teeth normally carried by said saw
7. The apparatus of claim 6 further comprising:
length adjusting means for adjusting the length of the bristle-carrying
bar to accommodate chain saws blades of different lengths.
8. The apparatus of claim 7 wherein said bristlecarrying bar comprises
two sections, one of which has a slot therein and said length adjusting
means comprises a stud in one of the sections for passing through said
slot, said stud including thread thereon for carrying a nut for
engagement with said stud.
9. The apparatus of claim 8 further including:
a rod-like means for attaching said front bracket to said saw blade and
for permitting limited movement of said bracket with respect to said
10. The apparatus of claim 9 wherein said brush bristles are in the
range of 1/2 inch to 2 inch long.
11. The apparatus of claim 10 wherein said brush bristles are
approximately 1 inch long.
12. The apparatus of claim 11 wherein said bristles comprise a
Nylon®-like plastic material.
U.S. Patent Documents
3042088 July 1962
Fillion et al.
4193193 March 1980
4211007 July 1980
4530679 July 1985
Foreign Patent Documents
127962 Feb., 1901
|Int. Cl. B27B 17/02
Current U.S. Class: 30/383 ; 15/160;
Field of Search:
Primary Examiner: Watts; Douglas D.
Attorney, Agent or Firm: Woodbridge; Richard C.