U.S. patent application number 10/952605 was filed with the patent office on 2005-03-10 for trimmer head.
Invention is credited to Bridges, Roy, Harris, David.
Application Number | 20050050738 10/952605 |
Document ID | / |
Family ID | 29215367 |
Filed Date | 2005-03-10 |
United States Patent
Application |
20050050738 |
Kind Code |
A1 |
Harris, David ; et
al. |
March 10, 2005 |
Trimmer head
Abstract
A trimmer head for use with rotary vegetation cutting devices is
disclosed. The head has a wear guide that indicates when the body
of the trimmer head is worn down and needs replacement. In an
embodiment of the invention, the body comprises two plates that are
molded to fit together. The plates have bores for holding
connecting pins. The connecting pins not only hold the plates
together, but also pivotably support cutting blades, by fitting
into openings in the blades.
Inventors: |
Harris, David; (Rio Oso,
CA) ; Bridges, Roy; (Reno, NV) |
Correspondence
Address: |
DANIEL P. MAGUIRE
423 E ST.
DAVIS
CA
95616
US
|
Family ID: |
29215367 |
Appl. No.: |
10/952605 |
Filed: |
September 30, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10952605 |
Sep 30, 2004 |
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10127924 |
Apr 23, 2002 |
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6817102 |
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Current U.S.
Class: |
30/276 |
Current CPC
Class: |
A01D 34/733 20130101;
A01D 34/736 20130101 |
Class at
Publication: |
030/276 |
International
Class: |
B26B 007/00 |
Claims
We claim:
1.) A method of cutting vegetation, comprising: providing a trimmer
with a head, said head having a wear guide; trimming vegetation
with said trimmer; inspecting said wear guide; and replacing said
head when said wear guide appears worn.
2.) The method according to claim 1, wherein said head has a
bottom, and wherein said wear guide is on said bottom.
3.) The method according to claim 2, wherein said wear guide is a
protrusion.
4.) The method according to claim 2, wherein said wear guide is a
depression.
5.) A trimmer head comprising: a body, said body having a wear
guide for use in determining when to replace said body; and a
cutting blade attached to said body.
6.) The trimmer head according to claim 5, wherein said body has a
bottom portion, and wherein said wear guide is on said bottom
portion.
7.) The trimmer head according to claim 6, wherein said wear guide
comprises a depression in said bottom portion.
8.) The trimmer head according to claim 6, wherein said wear guide
comprises a protrusion in said bottom portion.
9.) The trimmer head according to claim 5, wherein said body has a
side portion, and wherein said wear guide is on said side
portion
10.) The trimmer head according to claim 9, wherein said wear guide
comprises a depression in said side portion.
11.) The trimmer head according to claim 9, wherein said wear guide
comprises a protrusion in said side portion.
12.) The trimmer head according to claim 5, wherein said blade is
made of metal, and has a plastic overcoat.
13.) A method of cutting vegetation, comprising: providing a
trimmer, comprising: a head; means for cutting associated with said
head; and means for determining whether to replace said head;
cutting vegetation with said trimmer; and inspecting said means for
determining whether to replace said head.
14.) The method according to claim 13, additionally comprising
replacing said head when said step of inspecting said means for
determining whether to replace said head indicates that said head
is worn.
15.) The method according to claim 13, additionally comprising
continuing to use said head when said step of inspecting said means
for determining whether to replace said head indicates that said
head is not worn.
Description
RELATED APPLICATION
[0001] The present application is a continuation of U.S.
application Ser. No. 10/127,924, filed on Apr. 23, 2002.
FIELD OF THE INVENTION
[0002] The present invention relates to heads for attachment to
rotary vegetation cutting devices.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] FIG. 1 is an exploded perspective view of a trimmer head
according to an embodiment of the present invention.
[0004] FIG. 2 is a top view of a trimmer head according to an
embodiment of the present invention.
[0005] FIG. 3 is a bottom view of a trimmer head according to an
embodiment of the present invention.
[0006] FIG. 4 is a top view of a bottom plate of a trimmer head
according to an embodiment of the present invention.
[0007] FIG. 5 is a side cut-away view of a trimmer head according
to an embodiment of the present invention, taken along line 5-5 in
FIG. 2.
[0008] FIG. 6 is a side view of a trimmer head according to an
embodiment of the present invention.
[0009] FIG. 7 is a bottom view of a trimmer head according to an
embodiment of the present invention.
[0010] FIG. 8 is a side cut-away view of a trimmer head according
to an embodiment of the present invention, taken along line 8-8 as
depicted in FIG. 7.
[0011] FIG. 9 is a bottom view of a top plate of a trimmer head
according to an embodiment of the present invention.
[0012] FIG. 10 is a perspective view of the interior surface of the
top plate.
[0013] FIG. 11 is a perspective view of an embodiment of a trimmer
head blade.
[0014] FIG. 12 is a top view of the blade depicted in FIG. 11.
[0015] FIG. 13 is a side view of the blade depicted in FIG. 11.
[0016] FIG. 14 is a cut-away side view of the blade depicted in
FIG. 12, taken along lines 14-14.
[0017] FIG. 15 is a front view of the blade depicted in FIG.
11.
[0018] FIG. 16 is a side view of a trimmer head according to an
alternative embodiment of the present invention, with a protrusion
wear guide on the side.
[0019] FIG. 17 is a side view of a trimmer head according to an
alternative embodiment of the present invention, with a protrusion
wear guide on the bottom.
[0020] FIG. 18 is a side view of a trimmer head according to an
alternative embodiment of the present invention, with a indentation
wear guide on the side.
DETAILED DESCRIPTION
[0021] The present invention is a trimmer head, for attachment to a
rotary vegetation cutter. It is comprised of a body and blades. In
one embodiment, the body is comprised of a top plate, bottom plate,
and pins.
[0022] As illustrated in FIGS. 1, 2 & 6, the top plate, 20, is
a one-piece plate that fits over the bottom plate. A central bore
30 extends through the top plate, and the bore is sized so as to
accommodate the arbor or shaft of a trimmer. As illustrated in FIG.
9, the top plate 20 has a first set of pin bores 40, 42, and 44 on
its interior surface for holding pins 130, 132, and 134. The top
plate also has a plate coupling well 50, which fits with the
coupling boss 80 of the bottom plate 60 when the top plate 20 and
bottom plate 60 are joined together.
[0023] As illustrated in FIG. 1, in an embodiment of the invention
the top plate is triangular shaped, although it could also be a
number of other difference shapes, including circular, square, or
octagonal. etc.
[0024] As illustrated in FIGS. 1, 2, 3, 4, 5, 6, and 7, the bottom
plate 60 is a one-piece plate that fits with the top plate 20 and
pins to form the body of the trimmer head. The bottom plate 60 has
a base 70 that extends upwardly from the bottom plate. The base 70
houses a second set of pin bores 90, 92, and 94 that can be aligned
with the first set of pin bores 40, 42 and 44. Atop the base is a
coupling boss 80 that is shaped and aligned so as to conjoin with
the top plate's coupling well 50. The central bore 30 extends
through the bottom plate.
[0025] On the exterior or bottom surface of the bottom plate is a
shaft attachment depression 110 within which is a fastener well
120. As illustrated in FIG. 10, the attachment depression is
essentially the hollow interior of the base 70 and the coupling
boss 80, and in one embodiment of the invention the depression is
circular and has a circumference less than the circumference of the
coupling boss. Within the attachment depression 110 is the fastener
well 120, which has side wall 122 and fitted opening 124. The
central bore 30 extends through the fastener well.
[0026] As illustrated in the above-referenced figures, in an
embodiment of the invention the bottom plate is circular, although
it could also be a number of other different shapes, including
triangular, scalloped-shape for easy removal by hand, etc.
[0027] The trimmer head is attached to a rotary vegetation cutter
by inserting the shaft of the trimmer all the way through the
central bore 30, and by placing a fastener, such as a hex nut or
bolt, in the fastener well and securing it to the shaft. The
trimmer head is designed to work with many different kinds of
trimmers, and therefore different fasteners may be necessary to fit
the head to different trimmers.
[0028] As shown in FIGS. 7 and 8, the exterior surface of the
bottom plate also may have wear guides 100 and 102. These wear
guides are depressions or indentations, and as the bottom plate
wears away from use, the wear guides become shallower and
shallower. The user can then decide when to replace the trimmer
head based on the depth of the wear guides. Other suitable wear
guides could be fashioned from a protrusion that would wear away
with use, tire-type treads that would wear down, or a subsurface of
a different color that would be apparent when the plate wears down.
The wear guide could be placed on any portion of the body that
wears down from contact or use, including but not limited to the
bottom or side. FIGS. 7 and 8 show indentations 100, 102 on the
bottom, FIG. 16 shows a protrusion 106 on the side, FIG. 17 shows a
protrusion 103 on the bottom, and FIG. 18 shows an indentation 105
on the side.
[0029] For purposes of this patent, the following definitions
apply. "Wear guide" refers to any structure that indicates the
deterioration of the body of the trimmer head. "Body" refers
generically to any blade-holding piece or pieces, such as the top
plate and bottom plate. "Bottom portion" refers to the exterior
surface of the bottom plate, or in the case of unibody versions of
this invention, the bottom portion of the unibody. "Side portion"
refers to any side or lateral portion of the top or bottom plate,
and in the case of unibody versions of this invention, refers to
any side or lateral portion of the unibody.
[0030] The top plate and bottom plate are held together with pins
130, 132, and 134, which fit into the first set of pin bores, 40,
42, and 44 and into the second set of pin bores 90, 92, and 94, as
illustrated in FIG. 1. The pins are sized to tightly fit within the
pins bores 40, 42, and 44 (described below), so that pins become a
part of the top plate.
[0031] The blades 140, 142, and 144 have openings 160, 162, and 164
at one end, and the blades are attached to the body by inserting
the pins through the openings and into the first set of pin bores
and second set of pin bores, as illustrated in FIG. 1. The blades,
which rotate and pivot around the pins with the movement of the
shaft, may have serrations 150, 152, 154 to enhance their cutting
ability.
[0032] As shown in FIGS. 11-15, in an alternative blade embodiment,
170, the blade itself, 190, is made of metal, but has a plastic
overcoat, 180, as well as an opening 200, for insertion of the
pins.
[0033] The top plate, bottom plate and blades can be made of
plastic, and other materials such as aluminum. The pins can be made
of metal, such as steel, and also could be made of other
materials.
[0034] The top plate and bottom plate can be made by injection
molding, or machined using lathes and drill presses. One skilled in
the art will appreciate that the present invention can be practiced
by other than the described embodiments, which are presented for
purposes of illustration and not limitation.
* * * * *