Note: Descriptions are shown in the official language in which they were submitted.
- 1 -
PLANER HEAD
BACKGROUND
[0001] To manufacture plain wood lumbers, freshly cut wood logs
undergo a series of
transformations. Typically, the bark is first removed, then the cross-section
of the wood log is
transformed from a rounded shape to a cruciform shape. This shape
transformation
optimizes the number of wood lumbers that can be extracted from a given wood
log. In a
further step, wood lumbers are cut out of each of the cruciform shaped wood
logs, and
finally, the surfaces of the wood lumbers are trimmed to reduce roughness and
splinters, and
to obtain a consistent thickness throughout the length of the lumber.
[0002] The trimming step is generally carried out using one or more planer
heads. A
planer head has the general configuration of a large rotating wheel provided
with a plurality
of knives extending outwardly from its circumference. When a lumber passes
about a planer
head in rotation, the knives take off an outside layer of the wood lumber
(typically a 1/4 or 1/2
inch layer) thereby trimming and smoothing its surface. In most prior art
configurations, the
planer head includes a generally cylindrical body having a centrally disposed
bore coinciding
with an axis of rotation of the planer head (which is also its longitudinal
axis). The body is
plain and typically made of machined steel and includes a plurality of knife
pockets radially
disposed and uniformly distributed on a crenelated curved face defining the
circumference of
the body.
[0003] The knife pockets each include a first wall, and a second wall
spaced apart
and opposing the first wall. The first wall can be scalloped, while the second
wall is
substantially flat. Each of the knife pockets is configured to receive a
corresponding knife and
a knife holder for holding the knife into position during the operation of the
planer head.
[0004] Each knife includes a connection portion receivable in a knife
pocket to
connect to the body, and a cutting edge extending from the connection portion
to trim the
wood lumbers when the planer head is rotated about its axis of rotation.
[0005] Knife holders are typically radial members that collaborate
with a fastening
mechanism to retain the knives onto the body.
CA 3042114 2019-05-01
- 2 -
[0006] As will be appreciated by those skilled in the art, this
planer head configuration
suffers many drawbacks. One is the installation of bolts or other fastening
means on the
circumference of the planer head to fasten the knife holder. This arrangement
results in
significantly less area available for installation of knives. Since knives
realize the function of
the machine, this can result in lower throughput as well as lower quality of
finish in the
product being processed by the planer head. Furthermore, a planer head with a
large width
may require a plurality of fastening means (e.g. nuts and bolts) for each
knife and knife
holder. This makes maintenance and adjustment of a knife and knife holder a
more involved
process for the machine operator.
[0007] Therefore, there is a need for a planer head that will overcome at
least one of
the above-identified drawbacks.
BRIEF SUMMARY
[0008] According to a broad aspect, there is provided a planer head
comprising:
a cylindrical body having a rotational axis, the cylindrical body including at
least one
knife pocket on the periphery of the body having a first wall, a second wall
and a bottom wall,
the cylindrical body further including at least one bore extending parallel to
the rotational
axis, and at least one hole extending between the bottom wall of the pocket
and the at least
one bore,
at least one knife holder having a first wall, a second wall adjacent to the
second wall
of the knife pocket, a bottom wall, and at least one protrusion projecting
away from the
bottom wall of the at least one knife holder, the at least one protrusion
being configured to
engage the at least one hole of the cylindrical body and to partially extend
into the bore, the
knife holder being moveable in the knife pocket between a radially inward
position and a
radially outward position,
at least one knife received in the knife pocket of the cylindrical body, the
at least one
knife having a first wall adjacent to the first wall of the at least one knife
pocket, a second
wall adjacent the first wall of the at least one knife holder and a cutting
edge extending
radially away from the knife pocket, and
a fastening assembly for fastening the at least one knife holder to the
cylindrical body,
the fastening assembly including a longitudinal member and a fastening means,
the
CA 3042114 2019-05-01
- 3 -
longitudinal member being sized and shaped to fit within the bore of the
cylindrical body and
including a first end, a second end and at least one slot located between the
first end and the
second end, the at least one slot being shaped to interact with the at least
one protrusion of
the knife holder extending in the bore of the cylindrical body, the fastening
means of the
fastening assembly engaging the first end of the longitudinal member to force
the longitudinal
member from a released position toward a locked position, wherein when the
longitudinal
member is forced from the released position toward the locked position, the at
least one slot
of the longitudinal member engages the at least one protrusion of the knife
holder to urge
movement of knife holder from the radially inward position to the radially
outward position,
wherein the knife holder in the radially outward position secures the at least
one knife to the
cylindrical body.
[0009]
According to another broad aspect, there is provided a kit of a planer head
assembly comprising:
a cylindrical body having a rotational axis, the cylindrical body including at
least one
knife pocket on the periphery of the body having a first wall, a second wall
and a bottom wall,
the cylindrical body further including at least one bore extending parallel to
the rotational
axis, and at least one hole extending between the bottom wall of the pocket
and the at least
one bore,
at least one knife holder having a first wall, a second wall adjacent to the
second wall
of the knife pocket, a bottom wall, and at least one protrusion projecting
away from the
bottom wall of the at least one knife holder, the at least one protrusion
being configured to
engage the at least one hole of the cylindrical body and to partially extend
into the bore, the
knife holder being moveable in the knife pocket between a radially inward
position and a
radially outward position,
at least one knife receivable in the knife pocket of the cylindrical body, the
at least
one knife having a first wall adjacent to the first wall of the at least one
knife pocket, a second
wall adjacent the first wall of the at least one knife holder and a cutting
edge extending
radially away from the knife pocket, and
a fastening assembly for fastening the at least one knife holder to the
cylindrical body,
the fastening assembly including a longitudinal member and a fastening means,
the
longitudinal member being sized and shaped to fit within the bore of the
cylindrical body and
CA 3042114 2019-05-01
- 4 -
including a first end, a second end and at least one slot located between the
first end and the
second end, the at least one slot being shaped to interact with the at least
one protrusion of
the knife holder extending in the bore of the cylindrical body, the fastening
means of the
fastening assembly being engageable to the first end of the longitudinal
member to force the
longitudinal member from a released position toward a locked position, wherein
when the
longitudinal member is forced from the released position toward the locked
position, the at
least one slot of the longitudinal member engages the at least one protrusion
of the knife
holder to urge movement of knife holder from the radially inward position to
the radially
outward position, wherein the knife holder in the radially outward position
secures the at least
one knife to the cylindrical body.
[0010] In one feature, the at least one protrusion comprises a first
end adjacent the
bottom wall of the knife holder and a second end extending into the at least
one bore of the
cylindrical body.
[0011] In another feature, the second end of the at least one
protrusion comprises a
tapered end. Alternatively, the second end of at least one protrusion
comprises a
parabolically shaped end.
[0012] In yet another feature, the cylindrical body comprises three
holes extending
between the bottom wall of the at least one knife pocket and the bore and the
knife holder
comprises three protrusions configured to engage the three holes of the
cylindrical body and
to partially extend into the bore. In this feature, the longitudinal member
comprises three
slots configured to engage the three protrusions extending in the bore of the
cylindrical body.
[0013] In another feature, the cylindrical body further comprises a
mounting hole for
mounting the body to a rotating shaft, the mounting hole extending along the
rotational axis
at a center of the cylindrical body.
[0014] In yet another feature, the longitudinal member comprises a shaft
and a
threaded portion extending at the first end of the longitudinal member. In
this feature, the
fastening means comprises a nut engaging the threaded portion of the
longitudinal member.
[0015] In a further feature, the bore of the cylindrical body
comprises a first end, a
second end and a circular recess at the first end of the bore. The circular
recess of the bore
CA 3042114 2019-05-01
- 5 -
receiving the threaded portion of the longitudinal member and the nut engaging
the threaded
portion.
[0016] In still a further feature, the shaft of the longitudinal
member has a first
longitudinal axis, and the threaded portion of the longitudinal member has a
second
longitudinal axis, the second longitudinal axis of the threaded portion being
offset in a radial
direction from the first longitudinal axis of the shaft.
[0017] In yet a further feature, the bore has a third longitudinal
axis and the circular
recess has a fourth longitudinal axis, the fourth longitudinal axis the
circular recess being
offset relative to the third longitudinal axis of the bore in a radial
direction, wherein when the
longitudinal member is positioned in the bore, the second longitudinal axis of
the threaded
portion of the longitudinal member aligns with the fourth longitudinal axis of
the circular
recess.
[0018] In another feature, the longitudinal member further comprises
a flange
extending radially at the second end thereof.
[0019] In still another feature, the bore of the cylindrical body further
comprises a
second recess at the second end of the bore, the second recess of the bore
receiving therein
the flange extending at the second end of the longitudinal member. Preferably,
the flange at
the second end of the elongated member and the second recess at the second end
of the
bore have an oblong shape.
[0020] In yet another feature, the planer head comprises between 20 and 40
knife
pockets and a corresponding number of knives and knife holders. Preferably,
the planer
head comprises 24 knife pockets and a corresponding number of knives and knife
holders.
[0021] Additional and/or alternative features, aspects, and
advantages of
embodiments of the present will become apparent from the following
description, the
accompanying drawings, and the appended claims.
CA 3042114 2019-05-01
- 6 -
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] For a better understanding of the present, as well as other
aspects, and
further features thereof, reference is made to the following description which
is to be used in
conjunction with the accompanying drawings, where:
[0023] FIG. 1 is a right perspective view of a planer head according to a
first
embodiment;
[0024] FIG. 2 is a left perspective view of the planer head shown in
FIG. 1;
[0025] FIG. 3 is a right perspective, partially exploded view of the
planer head shown in
FIG. 1;
[0026] FIG. 4A is an enlarged, partial right view of the cylindrical body
of the planer head
shown in FIG. 1;
[0027] FIG. 4B is an enlarged, partial left view of the cylindrical body
shown in FIG. 4A;
[0028] FIG. 5A is a perspective view of a fastening assembly for the
planer head shown
in FIG. 1;
[0029] FIG. 5B is a front view of the fastening assembly shown in FIG. 5A;
[0030] FIG. 6A is a back left perspective view of a knife holder of the
planer head shown
in FIG. 1;
[0031] FIG. 6B is a side view of the knife holder shown in FIG. 6A;
[0032] FIG. 6C is a front left perspective view of the knife holder
shown in FIG. 6A;
[0033] FIG. 6D is a front view of the knife holder shown in FIG. 6A;
[0034] FIG. 7A is a front view of a knife of the planer head shown in
FIG. 1;
[0035] FIG. 7B is a front right perspective view of the knife shown in
FIG. 7A;
[0036] FIG. 8 is an enlarged, longitudinal cross-section view of the
planer head shown in
FIG. 1;
CA 3042114 2019-05-01
=
- 7 -
[0037]
FIG. 9 is a right view of the cylindrical body, knife holders and
knives of the planer
head shown in FIG. 1, with two knife holders and two knives removed;
[0038]
FIG. 10A is an enlarged right side view of a portion of the planer head
shown in
FIG. 1, showing one knife and knife holder prior to being fastened and
positioned;
[0039] FIG.
10B is another enlarged side view of a portion of the planer head shown in
FIG. 1, showing one knife and knife holder with a part of the fastening
assembly in place;
[0040]
FIG. 10C is another enlarged right side view of the portion of the
planer head
shown in FIG. 1, showing all knives and knife holders fastened and positioned;
[0041]
FIG. 11A is an illustration of a fastening assembly and a knife holder
prior to
fastening; and
[0042]
FIG. 11B is an illustration of the fastening mechanism and knife holder
shown in
FIG. 11A, after fastening.
DETAILED DESCRIPTION
[0043]
Referring to FIGs. 1 to 11B, an embodiment of a planer head 100 will be
described. In this embodiment, the planer head 100 includes a body 102, a
plurality of knives
104 and a corresponding plurality of knife holders 106. The planer head 100
also comprises
a corresponding plurality of fastening assemblies 108, each fastening assembly
108
including a longitudinal member 193 with a threaded portion 215 and nut 195.
Each fastening
assembly 108 collaborates with a corresponding knife holder 106 for securing
one knife 104
to the body 102 (only some knives 104 and knife holders 106 being identified
with reference
numerals).
[0044]
In the illustrated embodiment, the planer head 100 includes twenty-four
knives
104, twenty-four knife holders 106 and twenty-four fastening assemblies 108.
It is, however,
contemplated that the planer head 100 could comprise a different number of
knives 104,
corresponding knife holders 106 and fastening assemblies 108. For instance,
the planer
head 100 could comprise one or more knives 104, knife holders 106 and
fastening
assemblies 108. In one embodiment, the planer head 100 could comprise between
ten and
sixty knives 104, knife holders 106 and fastening assemblies 108, and
preferably between
twenty and forty knives 104, knife holders 106 and fastening assemblies 108.
CA 3042114 2019-05-01
- 8 -
[0045] With reference to FIGs. 1 and 2, the body 102 is generally
cylindrical and has
a generally circular right end 110, a generally circular left end 112 and a
crenelated curved
face 114 extending between the right end 110 and the left end 112 and defining
the
circumference of the body 102. The body 102 is preferably made of machined
steel. The
body 102 has a centrally disposed bore 116 extending between the right end 110
and the left
end 112 for mounting the planer head 100 on a rotating shaft (not shown), for
rotation about
an axis of rotation R1.
[0046] The body 102 includes a plurality of knife pockets 118
disposed on the curved
face 114 (best shown in FIG. 9). In the embodiment shown, the body includes
twenty-four
knife pockets 118. The person skilled in the art will appreciate that the
number of knife
pockets 118 could be different, and that the number of such knife pockets 118
will define the
number of knives 104 and knife holders 106 mountable to the body 102. The
knife pockets
118 are uniformly spaced apart (i.e. distributed) along the crenelated curved
face 114 or
circumference of the body 102.
[0047] Each knife pocket 118 is sized and shaped to receive a corresponding
knife
104 and a corresponding knife holder 106 therein. Each knife pocket comprises
a lower
receiving portion 120 and an upper receiving portion 122 (shown in FIG. 4A).
The lower and
upper receiving portions 120, 122 share a common front wall 124, which is
forwardly angled
at an angle 01 relative to a radius extending from the rotation axis R1 to the
bottom end 129
of the front wall 124 (see FIG. 4A). The lower receiving portion 120 is also
provided with a
back wall 126, spaced apart from the front wall 124 and extending parallel
thereto, as well as
a bottom wall 128 extending between the front wall 124 and the back wall 126
and
perpendicular thereto, at the bottom ends 129, 131 thereof.
[0048] The upper receiving portion 122 of the knife pocket 118
comprises a back wall
130 having a top end 132 and a bottom end 134. The back wall 130 is forwardly
angled at an
angle 02 relative to a radius extending from the rotation axis R1 to the
bottom end 134. As
one can appreciate from FIG. 4A, the angle 02 is smaller than the angle 01,
and therefore the
top end 127 of the front wall 124 converges toward the back wall 130, at an
angle 03, to
define somewhat of a funneled shaped knife pocket 118 (see FIG. 9). While in
the illustrated
.. embodiment, the front and back walls 124, 126 and 130 are generally flat,
it is contemplated
that in an alternative embodiment at least one of them could be scalloped to
increase
frictional engagement with the knife 104 and knife holder 106.
CA 3042114 2019-05-01
- 9 -
[0049] Extending between the bottom end 134 of the back wall 130 and
the bottom
end 131 of the back wall 126 of the lower receiving portion 120 is a knife
holder resting wall
136. The knife holder resting wall 136 extends perpendicular to the back wall
130 and
provides support to the knife holder 106 received in the knife pocket 118, as
it will become
apparent below.
[0050] As it will be appreciated, a portion of the body 102 extends
generally radially
between each pair of adjacent knife pockets 118. Together, the knife pockets
118 therefore
define a plurality of knife retaining members 138, each retaining member 138
comprising a
trailing face 140 (corresponding to the back walls 126 and 130 of a first
knife pocket 118), a
leading face 142 (corresponding to the front wall 124 of the adjacent knife
pocket 118) and a
backwardly and upwardly angled top face 144 extending between the trailing
face 140 and
the leading face 142. Each knife retaining member 138 also includes lower
portion 146
extending from the bottom wall 128 of the lower portion 120 to a junction J1,
as well as an
upper portion 148 extending from the junction J1 to the top face 144 of the
retaining member
138.
[0051] Extending longitudinally between the right and left ends 110,
112 is a plurality
of bores 160 for receiving therein the corresponding plurality of fastening
assemblies 108 to
secure the knife holder 106, as it will become apparent below. The bores 160
are pathways
with a circular cross section. On the right end 110, the body is provided with
a plurality of
circular recesses 152, one recess 152 being adjacent to each bore 160. As best
shown in
FIG. 4A, the circular recess 152 is offset or eccentric relative to the bore
160. On the left end
112, the body 102 is provided with a plurality of oblong recesses 150, one
oblong recess
being adjacent to each bore 160. As it will become apparent below, the
configuration of the
circular recesses 152 and oblong recesses 150 collaborate with the fastening
assemblies
108 to ensure proper positioning of the fastening assemblies 108 relative to
the body 102, to
ensure proper fastening of the knife holders 106.
[0052] Extending between each bore 160 and the knife holder resting
wall 136 of a
corresponding knife pocket 118 is a plurality of holes 189. As it will become
apparent below,
the holes 189 are sized, shaped and positioned to receive therein a
corresponding plurality of
protrusions 186 projecting from a knife holder 106 received in the knife
pocket 118, the
protrusions 186 extending in a corresponding bore 160 to be engaged by a
corresponding
fastening assembly 108.
CA 3042114 2019-05-01
=
- 10 -
[0053] Turning now to FIGs. 5A to 5B, a fastening assembly 108 will
now be
described in accordance with one embodiment. In this embodiment, the fastening
assembly
comprises a longitudinal member 193 comprising a left end 212, and a right end
210. Moving
from the right end 210 toward the left end 212, the longitudinal member 193
comprises a
threaded portion 215, a main shaft 179 and an oblong flange 199 projecting
radially from the
main shaft 179. The main shaft 179 is sized and shaped to be received in the
bore 160, while
the threaded portion 215 is configured to project in the circular recess 152
of body 102. As
best shown in FIG. 5B, the threaded portion 215 of the longitudinal member 193
is cylindrical
and has a smaller diameter than the main shaft 179, its longitudinal axis L2
being offset
relative to a longitudinal axis L1 of the main shaft 179. The threaded portion
is sized and
shaped to receive a plurality of washers 197 (in the illustrated embodiment,
three washers)
and a nut 195. Defined on the main shaft 179 of the longitudinal member 193 is
a plurality of
cuneal slots 191 positioned to be in registry with the holes 189 of the body
102 and to
receive therein the protrusions 186 of the knife holder 106 when the fastening
assembly 108
is in place in the body 102.
[0054] Although the slots are only found on one side in the preferred
embodiment,
other forms are possible without deviating from the invention. For example, an
alternative
embodiment may include slots spanning the circumference of the longitudinal
member.
[0055] The longitudinal axis L1 of the main shaft 179 aligns with a
longitudinal axis L3
of the bore 160. The longitudinal axis L2 of threaded portion 215 aligns with
a longitudinal
axis L4 of the recess 152 (see FIGs. 10B and 8). This allows the threaded
portion 215 to be
fastened to the body 102 using nut 195 only when L2 is centered in the recess
152. This
arrangement ensures that the cuneal slots 191 are in position to engage with
the protrusions
186 of the knife holder 106 during assembly.
[0056] On the left end 212 of the longitudinal member 193, the oblong
flange 199 is
sized and shaped to be received in the oblong recess 150 of the body. As it
will become
apparent below, the shape of the oblong lip, as well as the configuration of
the threaded
portion 215 of the longitudinal member 193, together with the oblong recess
150 and the
circular recess 152 of the body 102, respectively, ensure that the
longitudinal member 193 is
properly positioned in the bore 160 for ensuring proper interaction with
protrusions 186 of the
knife holder 106.
CA 3042114 2019-05-01
-11 -
[0057] Although a fastening mechanism has been described above per
the preferred
embodiment of the invention, the person skilled in the art will appreciate
that other fastening
means are possible. As a non-limiting example, a pin and lever type fastening
mechanism or
a different form of a threaded fastener may be used.
[0058] Turning now to FIGs. 6A to 6D, the knife holders 106 will be
described in
accordance with one embodiment. In this embodiment, each knife holder 106 has
a
longitudinal oriented slender body having a right end 164 and a left end 166.
The knife holder
106 further comprises a lower portion 168 comprising three protrusions 186
sized and
shaped to be received in holes 189 in the knife holder resting wall 136 and
cuneal slots 191
in the longitudinal member 193. Although in this embodiment the knife holder
106 comprises
three cylindrical protrusions 186 to engage a corresponding plurality of holes
189, it will be
understood that the body 102 and knife holder 106 could include a different
number of holes
189 and corresponding protrusions 186. Furthermore, it will be appreciated
that the holes
189 and protrusions 186 could have other shapes provided that the protrusions
186 can be
received in the holes 189 to engage cuneal slots 191. For example, the
protrusions 186 may
have parabolically shaped ends with the cuneal slots 191 shaped accordingly to
receive
them. The slots may have a linear or nonlinearly shaped slope. Alternatively,
the protrusions
186 and holes 189 may have a rectangular or another non-circular cross
section.
[0059] The knife holder 106 further comprises an upper portion 170,
sized and
shaped to be received in the upper receiving portion 122 of the corresponding
knife pocket
118. The upper portion 170 of the knife holder 106 includes a trailing face
172 configured to
abut the back wall 140 of the knife pocket 118, a bottom face 176 extending
between a
chamfered edge 180 and a surface 184. There is an angle 84 as measured between
the
trailing face 172 and the leading face 178 and the surface 184 is set at an
angle 05 to the
leading face 178. Extending between the trailing face 178 of the upper portion
170, and the
trailing face 172, at the upper end thereof, is a curved top face 182. At the
bottom end of the
trailing face 172 is a chamfered edge 180, while at the opposite side at the
bottom end of the
leading face 178, is a surface 184 set at an angle 05 to the leading face 178.
[0060] The person skilled in the art will understand that the knife
holder may be
manufactured as one part or may be assembled together. For example, it's
possible to
manufacture the upper portion 170 separate from the lower portion 168 in order
to reduce
material waste. The protrusions 186 can be attached to the upper portion 170
through
CA 3042114 2019-05-01
- 12 -
welding or other methods well known in the art. Alternatively, the protrusions
186 can remain
unattached to the upper portion 170, having one end in contact with the upper
face 170 and
another end in contact with the longitudinal member 193 when the planer head
100 is
assembled.
[0061] With reference to FIGs. 7A and 7B, each knife 104 has the general
shape of a
rectangular plate and comprises a connection portion 190 receivable in a
corresponding knife
pocket 118 and a cutting portion 192 extending therefrom. Each knife 104 has a
right end
194, a left end 196, as well as a leading face 198 and a parallel trailing
face 200 extending
therebetween. Extending perpendicularly to the leading and trailing faces 198,
200, at the
lower end thereof, is a bottom face 202, while a top face 204 extends
angularly (upwardly
and forwardly) from the upper end of the trailing face 200 toward the upper
end of the leading
face 198 to define a cutting edge 206. In one embodiment, each knife 104 is
made of
machined iron tool steel. The skilled addressee will appreciate that various
alternative
embodiments may be provided.
[0062] When the knife 104 is positioned in the knife pocket 118 (best shown
in FIGs.
10A and 10B), the connection portion 190 of the knife 104 is received in the
knife pocket 118,
and the cutting edge 206 extends outwardly from the body 102. The cutting
edges 206 of the
knives 104 are disposed so that they face a same forward direction to
effectively cut an
outside layer of the wood lumbers (not shown) when the planer head 100 is
rotated about the
axis R1.
[0063] Turning now to FIGs. 8 to 11B, the assembly of the planer head
100 now will
be described. In a first step, the knives 104 and knife holders 106 are
positioned in the knife
pockets 118, one knife 104 and one knife holder 106 being received in a
corresponding knife
pocket 118. A longitudinal member 193 is then inserted into the bore 160. The
protrusions
186 fit through holes 189 in the body 102 and into cuneal slots 191 in the
longitudinal
member 193. The cuneal slots 191 are tapered so that as the nut 195 is
tightened onto the
longitudinal member 193, the protrusions 186 are pushed upwards securing the
knife holder
106 against the knife 104. With tightening of the nut 195, the knife 104 is
therefore frictionally
engaged and secured. This step is repeated until all parts are in place. At
this point, the
planer head 100 can be operated.
[0064] While in the above-described embodiment the leading and
trailing faces 198,
200, 172, 178, 140 and 142 of the knives 104, knife holders 106 and knife
retaining members
CA 3042114 2019-05-01
-13-
138 are generally flat, it is contemplated that at least some of them could be
scalloped to
increase frictional engagement. Additionally, although in this embodiment the
protrusions 186
are circular, it is conceivable that they be of another suitable shape (e.g.
rectangular).
[00651 Modifications and improvements to the above-described
embodiments of the
present may become apparent to those skilled in the art. For instance, it
should be
understood that the planer heads described herein could be positioned in a
horizontal
position, vertical position, or any angled position between a vertical
position and a horizontal
position to smoothen a given surface of a lumber. It should also be understood
that the
planer heads described herein are not limited to be used with wood lumbers,
but could be
.. used with any other surface which may require smoothing and for which the
rotational cutting
of an external layer of that surface would be appropriate. Likewise, the
embodiments
described herein could find use in a cutter head provided with removable
knives other than
planer heads.
CA 3042114 2019-05-01
