U.S. patent application number 09/885984 was filed with the patent office on 2002-04-18 for router tables.
Invention is credited to Apolinski, Edmund, Daniels, David R., Degen, Klemens.
Application Number | 20020043296 09/885984 |
Document ID | / |
Family ID | 24552996 |
Filed Date | 2002-04-18 |
United States Patent
Application |
20020043296 |
Kind Code |
A1 |
Daniels, David R. ; et
al. |
April 18, 2002 |
Router tables
Abstract
Router tables, generally used for woodworking, have fences used
to guide workpieces during cutting. The router table has a table
top which has a top work surface and a router bit hole through the
table top. A plurality of support legs are provided below the table
top. A safety shield is positioned above the router bit hole. The
workpiece fence has left and right fences which operate
independently of each other. The left and right fences slide on the
top work surface in a front to rear direction and a side to side
direction. A feather flap extends from the workpiece fence and
holds the workpiece down against the table top during cutting. A
miter guide is provided that has a slide guide for stabilizing the
work piece. Also, a dovetail/boxjoint bar that can be slidably
adjusted is provided. A variety of routers are accommodated by a
number of hole patterns provided in the table top.
Inventors: |
Daniels, David R.; (Lake
Villa, IL) ; Apolinski, Edmund; (Chicago, IL)
; Degen, Klemens; (Weibern, DE) |
Correspondence
Address: |
SCHIFF HARDIN & WAITE
6600 SEARS TOWER
233 S WACKER DR
CHICAGO
IL
60606-6473
US
|
Family ID: |
24552996 |
Appl. No.: |
09/885984 |
Filed: |
June 20, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09885984 |
Jun 20, 2001 |
|
|
|
09636702 |
Aug 11, 2000 |
|
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Current U.S.
Class: |
144/286.5 |
Current CPC
Class: |
Y10T 83/7697 20150401;
Y10T 409/30392 20150115; Y10T 83/7607 20150401; B23Q 11/06
20130101; B27G 21/00 20130101; B23Q 3/069 20130101; B27C 5/04
20130101 |
Class at
Publication: |
144/286.5 |
International
Class: |
B25H 001/00 |
Claims
What is claimed is:
1. A router table comprising: a table top having a top work surface
with a guide channel, and a router bit hole through the table top;
a plurality of support legs below the table top; a safety shield
positioned above the router bit hole; a workpiece fence slidably
positioned on the top work surface; and a feather flap extending
from the workpiece fence, wherein said feather flap is comprised of
a resilient material and is configured as a flat L-shaped
strip.
2. The router table as claimed in claim 1, further comprising a
miter guide, said miter guide comprising: a protractor having a
half-circular shape comprising a flat side and a
half-circular-shaped side, said protractor comprising: a protractor
adjustment slot that is parallel to said half-circular-shaped side;
and an angular scale comprising angular measurement indicators;
said miter guide further comprising: a miter bar that is affixed to
a bottom side of said protractor and that rides inside of said
guide channel permitting movement of said miter guide in a linear
direction, said miter bar utilizing a fastener between said miter
bar and said protractor adjustment slot for adjusting the angle of
said protractor; and a slide guide attached to said flat side of
said protractor that operates to hold a workpiece against a table
top by applying a downward force to said workpiece, said slide
guide being in contact with said workpiece.
3. The router table as claimed in claim 1, further comprising:
featherboard flaps that are flat and are generally L-shaped, said
L-shape defining a mounting leg of said featherboard flap and a
workpiece contacting leg of said featherboard flap, said
featherboard flap being mounted according to at least one of the
following configurations: a) said mounting leg being inserted into
a featherboard flap hole of said workpiece fence to provide a
downward force on said workpiece against said flat table top; and
b) said mounting leg being inserted into a featherboard flap hole
of said flat table top to provide an inward force on said workpiece
against a front surface of said workpiece fence.
4. A machining table having a table top, comprising: a
dovetail/boxjoint bar that is used to produce dovetail joints, box
joints, and combination joints, said bar having a cross-sectional
width that is equal to the diameter of a cutter mounted in said
machining table; wherein said dovetail/boxjoint bar is affixed
directly on said table top so that its inner edge is a distance
equal to the diameter of said cutter away from an outer edge of
said cutter.
5. The machining table as claimed in claim 4, wherein said
dovetail/boxjoint bar is affixed utilizing fasteners that pass
through two or more holes in said dovetail/boxjoint bar and
respective slots of said table top permitting said distance to be
adjusted.
6. A router table having a table top, comprising hole pattern
groups having Group B holes, Group C holes, Group D holes, Group E
holes, and group F holes within said table top.
7. The router table as claimed in claim 6, further comprising hole
pattern groups having Group A holes, a threaded pilot pin hole, and
a pilot pin storage hole.
8. A method for adding a dovetail/boxjoint bar to a router table
for producing dovetail joints, box joints, and combination joints,
comprising the steps of: affixing said dovetail bar having a same
width as the diameter of a router bit on a table top of said router
table, a horizontal mounting position of said dovetail/boxjoint bar
being located at a distance away from an outer edge of said router
bit that provides a gap between said outer edge of said router bit
and an inner edge of said dovetail/boxjoint bar that is equal to
the diameter of said router bit; said step of affixing comprising
the steps of placing two or more dovetail bar fasteners through two
or more respective holes in said dovetail bar and through two or
more respective dovetail bar mounting slots in said on said table
top, thereby permitting adjustment in a horizontal direction, said
fasteners having a securing mechanism for tightening the secure
mount of said dovetail bar to said table top.
9. A miter guide comprising: a protractor having a half-circular
shape comprising a flat side and a half-circular-shaped side, said
protractor comprising: a protractor adjustment slot that is
parallel to said half-circular-shaped side; and an angular scale
comprising angular measurement indicators; said miter guide further
comprising: a miter bar that is affixed to a bottom side of said
protractor and that rides inside of a guide channel permitting
movement of the miter guide in a linear direction, said miter bar
utilizing a fastener between said miter bar and said protractor
adjustment slot for adjusting the angle of said protractor; and a
slide guide attached to said flat side of said protractor that
operates to hold a workpiece against a table top by applying a
downward force to said workpiece, said slide guide being in contact
with said workpiece.
10. The miter guide according to claim 9, wherein said slide guide
is constructed of a flat strip of a resilient material, said slide
guide having a flattened end that slides into a slide guide slot
located on said flat side of said protractor.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a continuation in part of parent
application Ser. No. 09/636,702, filed Aug. 10, 2000. The parent
application is herein incorporated by reference.
FIELD OF THE INVENTION
[0002] The present invention generally pertains to power tools for
woodworking. More specifically, the present invention pertains to
router tables used with routers. The present invention also
pertains to fences used to guide workpieces during cutting.
BACKGROUND OF THE INVENTION
[0003] Woodworking power tools, such as a router mounted on a
router table, are commonly used to cut wood workpieces. Typically,
a power router and router table assembly has the router mounted
underneath table with the router bit facing vertically upward. The
router bit extends upward through a hole in the router table and
protrudes above the table. Existing router tables have had
adjustable fences on top of the table. The wood workpiece can be
slid on the table and along the fence to engage and be cut by the
router bit.
[0004] Examples of U.S. patents pertaining to wood working power
tools, including router and router tables, include the following
U.S. Patents:
1 U.S. Patent No. Title 404,233 Saw Table Gage 727,337 Guide for
Woodworking Machines 1,664,969 Guide for Molder Tables 3,101,104
Safety Device for Saws 3,905,273 Machine Tool Assembly 4,088,164
Portable Router Attachment 4,186,784 Tool Table Construction
4,615,247 Anti-Kickback System 4,719,951 Combination Drill Press,
Router and Shaper Table, and Methods of Constructing and Utilizing
Same 4,738,571 Routing Apparatus With Dust Extraction System
4,750,536 Router Vacuum Attachment 4,884,604 Guide Fence and Miter
Guide Assembly for Router Mounting Table 5,00,237 Jointer Cutter
Guard with Featherboard 5,024,257 Woodworking Machine 5,025,841
Multi-purpose Support Table for a Router 5,042,542 Router Table
Gauge 5,139,065 Auxiliary Drop-In Table Top Power Tool Base
5,611,378 Tilting Router Table 5,755,148 Adjustable Fence for a
Compound Miter Saw 5,755,319 Safety Power Switch 5,855,234 Router
Table Assembly with Microset Throat Plate 5,865,079 Adjustable
Workpiece Support Apparatus for a Compound Miter Saw 5,943,931
Adjustable Fence for a Compound Miter Saw Des 105,621 Shaper Table
Des 248,304 Table for Portable Cutting Tools Des 273,195 Power Tool
Table Des 334,388 Combination Bench Router and Shaper Des 343,846
Router Table
[0005] Existing router tables and other wood working power tools
have included fences for guiding the wood workpieces during
cutting. However, existing fences can be improved. Also, existing
woodworking power tools, such as router tables, can be improved.
For example, improvements can be made to hold down wood workpieces
during cutting.
[0006] One difficulty in accommodating various routers in router
work tables is that there is no universal standard for mounting
routers. Positions of attachment mechanisms tend to vary not only
from manufacturer to manufacturer, but even within a given
manufacturer, depending on the size or other characteristics of the
router.
[0007] In order to accommodate different router configurations,
various techniques have been employed. For example, according to
the Craftsman Router Adapter Plate for Industrial Router Tables:
Instructions for Assembly and Installation of Your Model No.
171.25333, January 1997, a template having concentric circles of
various sizes printed on it is attached to a router adapter plate
using tape. The router is placed on the adapter plate with the
template on, and the location of the base plate mounting holes are
marked using a pencil or felt tipped marker. Holes are then drilled
at the previously marked hole positions. The template is then
removed, and the router is attached to the base plate with screws
going through the holes that were previously drilled.
[0008] While this technique permits a base plate to accommodate any
router that has been designed with attachment screws/holes, it
involves a substantial amount of work on the part of the purchaser.
First, it requires that the user have a drill with the correct size
drill bits on hand. Second, it requires time and effort to properly
drill the required holes. The positions must be properly and
accurately marked--while using the template provided is a helpful
aid, it is by no means foolproof. Erroneous hole locations could
still potentially result--these would be difficult if not
impossible to correct. Also, the holes may be required to have a
particular countersink to work properly. Purchasing the necessary
tools to complete the job result in greater incurred expenses.
Furthermore, this process would have to be repeated for each and
every different router configuration that might be used.
[0009] In order to eliminate the step of users drilling the holes
themselves, adapter plates have been created which can accommodate
various router configurations. For example, the Craftsman Router
Universal Adapter Plate for Assembly and Operation--Owner's Manual
for Model No. 171.25326 provides an adapter plate that is
pre-drilled and slotted to accommodate a number of different
routers. Although the holes and slots are pre-drilled in this
adapter plate, however, various mechanism are utilized by it to
minimize the number of holes and slots in the plate. The use of
slots to accommodate router configurations of varying sizes does
allow flexibility, but results in a mounting that is not as solid
as one that exclusively used holes. There is a small degree of play
in the router that results from the use of slots--this results from
the inherent strength and stiffness of the material from which the
router plate is manufactured. Also, the additional material removed
from the adapter plate to make slots, as opposed to holes, results
in a weakened plate design over one that uses only holes, and is
not as durable. Although the strength could be increased with other
techniques such as using stronger material or making the plate
thicker, these techniques would result in an increased material and
production cost.
[0010] Furthermore, this design requires the use of additional
countersink bushings in order to accommodate the various types of
countersinks present on different router models. These countersink
bushings increase the cost of an adapter plate over a design that
doesn't require them, and make the plate more difficult to
install.
[0011] For these reasons, it is desirable to have a router adapter
base plate that can be quickly connected to a router and provides a
strong mounting for the router when the plate-router assembly is
mounted on a table.
SUMMARY OF THE INVENTION
[0012] The present invention provides new router tables for use
with routers to cut workpieces. The present invention also provides
new fences for guiding workpieces during routing. The new fences
have feather board flaps which provide support for the workpieces
by holding the workpieces securely against a table top. The feather
board flaps can reduce chatter and kickback.
[0013] One new router table according to the present invention
includes a table top having a top work surface and a router bit
hole through the table top. A plurality of support legs are
provided below the table top. A safety shield is positioned above
the router bit hole. A workpiece fence is slidably positioned on
the top work surface, and a feather flap extends from the workpiece
fence.
[0014] Preferably, the feather flap is removable from the workpiece
fence and can be inserted in various holes through the workpiece
fence. The feather flap may have a first portion extending from the
workpiece fence and a second portion extending from the first
portion downward toward the top work surface of the table top.
[0015] An alternate embodiment is provided in which the feather
flap may be constructed from a flat L-shaped strip of resilient
material.
[0016] The router table also has a switch box which has an
electrical outlet, and ON/OFF switch with a safety key, and a
resettable circuit breaker. The table top of the router table has
an exhaust hole for removing debris during cutting of the
workpiece.
[0017] The workpiece fence has a left workpiece fence which is
independent of a right workpiece fence. The left and right
workpiece fences have a fence base which is slidable in a front to
rear direction on the table top. A fence front is mounted to the
fence base and slides in a side to side direction.
[0018] One fence system for guiding a workpiece according to the
present invention includes a fence base having a left front edge
portion spaced apart from a right front edge portion by a gap. A
left fence front is slidably mounted to the left front edge portion
of the fence base, and a right fence front is slidably mounted to
the right front edge portion of the fence base. A feather flap
extends from at least one of the left and right fence fronts.
[0019] An alternate embodiment is provided that provides a dovetail
bar that can be used for making various types of joints.
Furthermore, the alternative embodiment provides an inventive
series of hole group patterns made to accommodate a number of
different routers without requiring drilling by the user and
without the use of slotted (and less stable) mounting holes.
[0020] Advantages of the present invention may become apparent upon
reading this disclosure including the appended claims and with
reference to the accompanying drawings. The advantages may be
desired, but may not necessarily be required to practice the
present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 is a perspective view of a router table according to
the principals of the present invention;
[0022] FIG. 2 is an exploded perspective view of the router table
of FIG. 1;
[0023] FIG. 3 is an enlarged, partial perspective view of the
router table of FIG. 1;
[0024] FIG. 4 is a top plan view of the router table of FIG. 1;
[0025] FIG. 5 is a partial top plan view of the router table of
FIG. 1;
[0026] FIG. 6 is a bottom view of the router table of FIG. 1;
[0027] FIG. 7 is a right side elevational view of the router table
of FIG. 1;
[0028] FIG. 8 is a perspective view of an alternative embodiment
according to the present invention;
[0029] FIG. 9 is an exploded perspective view of an inventive miter
guide;
[0030] FIG. 10 is a perspective view of the miter guide and feather
flaps for holding a workpiece in place;
[0031] FIG. 11 is a perspective view of a dovetail/boxjoint bar
mounted on the table top;
[0032] FIG. 12 is a perspective view of the dovetail/boxjoint bar
in use;
[0033] FIG. 13 is a top view of a hole pattern used to accommodate
a large variety of different routers; and
[0034] FIG. 14 is a perspective view illustrating mounting a router
to the router table.
DETAILED DESCRIPTION OF THE INVENTION
[0035] Although the present invention can be made in many different
forms, the presently preferred embodiments are described in this
disclosure and shown in the attached drawings. This disclosure
exemplifies the principles of the present invention and does not
limit the broad aspects of the invention only to the illustrated
embodiments.
[0036] One router table 10 according to the present invention is
shown in FIG. 1, and the router table 10 is shown partially
exploded in FIG. 2. The router table 10 has a flat table top 12 and
four support legs 14 attached to the underneath of the table top
12. The table top 12 has a top work surface 16 for supporting a
workpiece when routing. Leg extensions (not shown) can be attached
to the support legs 14, if desired. Various mounting holes 18 are
provided to mount various routers (not shown) to the router table
10 underneath the table top 12. A router bit hole 20 extends
through the table top 12 for a router bit 22 (FIG. 4). The table
top 12 has a circular-shaped recess 13 (FIG. 6) in the bottom side
and concentric with the router bit hole 20 for accommodating a
disk-shaped adapter plate that can be mounted to a router.
[0037] A safety shield 24 is provided to protect the operator of
the router table during routing. The safety shield 24 has a pivot
pin 26 on both the left and right sides of the safety shield 24.
The pivot pins are each rotatably received in left and right
eyebolts 28 to pivotally mount the safety shield 24 to the table
top 12.
[0038] A front portion of the safety shield 24 is positioned above
the router bit hole 20 and a rear portion of the safety shield 24
is positioned above an exhaust hole 30 through the table top 12
(see FIG. 2 for the exhaust hole 30). The left and right pivot pins
26 are positioned at the rear portion of the safety shield 24 in
the area of the exhaust hole 30. Accordingly, the front portion of
the safety shield 24 pivots upward when a workpiece passes
underneath the safety shield 24. Also, the safety shield can be
pivoted upward to expose the router bit hole 20 and the router bit
22.
[0039] The safety shield 24 has a top, left and right sides, and
front and back sides. The bottom of the safety shield 24 is open to
the top surface 16 of the table top 12. The inside of the safety
shield 24 is hollow which defines an exhaust flow path from the
router bit hole 20--and the router bit 22--to the exhaust hole 30
for debris from the workpiece being cut. The debris exhaust flow
path runs from the router bit hole 20 rearward and generally
parallel to the table top 12, and then downward through the exhaust
hole 30, generally perpendicular to the table top 12. The back side
of the of the safety shield 24 deflects the debris downward through
the exhaust hole 30. A vacuum hose can be connected to the exhaust
hole 30 underneath the table top 12 to assist in removing and
collecting the debris.
[0040] The left and right sides of the safety shield 24 each have a
workpiece pass-through hole 32. The workpiece pass-through holes 32
and the inside area of the safety shield 24 between the workpiece
pass-through holes 32 define an open path through the safety shield
24 for the workpiece, as shown in FIG. 7. Portions of two workpiece
fences 34 may extend through the workpiece pass-through holes 32 as
shown in FIG. 3. Some workpieces may have a small width and will
pass through the workpiece pass-through holes 32 without raising
the safety shield 24. Some workpieces may have a portion that
extends upward from the top face of the workpiece, and that portion
may pass through the workpiece pass-through holes 32. Some
workpieces may have a width sufficiently large enough that the
workpiece will pivot the front portion of the safety shield 24
upward to ride on top of the workpiece as the workpiece is passed
by the router bit 22.
[0041] The router table 10 also has a workpiece fence system for
guiding the workpiece during routing. The workpiece fence system
includes left and right workpiece fences 34 which operate
independently from each other. The left and right workpiece fences
34 are mirror images of each other, and each workpiece fence 34 has
a fence base 36 and a fence front 38. The fence base 36 has a
substantially flat body 40 with two parallel mounting slots 42 that
extend in a front to rear direction. Threaded bolts 42 extend
upward from the table top 12 and extend through the mounting slots
42. Knobs 46 are threaded onto the bolts 42 and are used to clamp
the fence base 36 in a desired position on the top work surface 16
of the table top 12. Raised areas 48 may be provided to strengthen
the fence base 36. Other mechanisms can be used to clamp the fence
base 36 in various positions on the table top 12, if desired.
[0042] The fence base 36 has a downwardly extending guide flange 50
along an edge of the flat body 40. The guide flange 50 extends in
the front to rear direction and slides in a slot 52 in the table
top 12 which also extends in the front to rear direction. The guide
flange 50 and the slot 52 restrict the movement of the fence base
36 in the front to rear direction. Of course, the front to rear
direction as used in this disclosure includes movement from the
front towards the rear and from the rear towards the front.
[0043] An upwardly extending guide flange 54 runs along a front
edge of the flat body 40 of the fence base 36 and generally
perpendicular to the guide flange 50. The fence front 38 has a slot
56 which receives the guide flange 54. Accordingly, the front fence
38 can slide in a side to side direction on the fence base 36.
Fasteners, such as wing nuts 58 and bolts 60 pass through elongated
slots 62 (FIG. 4) in a flange 64 of the fence front 38 to
adjustably mount the fence front 38 to the fence base 36. Referring
to FIG. 2, the front edges having the guide flanges 54 of the left
and right fence bases 36 are spaced apart from each other by a gap
55.
[0044] FIGS. 4 and 5 show the adjustability of the fence system.
Wing nuts 58 can be loosened to allow the left and right fence
fronts 38 to independently slide in the side to side direction
indicated by the arrows in FIG. 4. A reduced height portion 66 of
the fence front 38 can be positioned close to or away from the
router bit 22 as desired. Referring to FIG. 5, the knobs 46 can be
loosened to allow the left and right workpiece fences 34 to
independently slide in the front to rear direction as indicated by
the arrows. The fence fronts 38 of the left and right workpiece
fences 34 can be positioned aligned with each other (FIG. 4) or
offset from each other (FIG. 5) as desired.
[0045] Referring to FIGS. 2 and 3, the fence front 38 has a
vertical front workpiece face 68 for guiding the workpiece. A
plurality of holes 70 are provided through the fence front 38 at
the front workpiece face 68. One or more feather flaps 72 are
removably positioned in the holes 70 to hold the workpiece 74 (FIG.
3) securely against the table top 12. The feather flap 72 has a
first portion 76 extending from the workpiece fence 34 and a second
portion 78 extending from the first portion 76 downward toward the
top work surface 16 of the table top 12. An end of the second
portion 78 contacts the top of the workpiece 74 and the feather
flap 72 resiliently flexes to hold the workpiece 74 down as the
workpiece 74 slides along the workpiece fences 34 and under the
feather flaps 72. The first portion 76 of the feather flap 72 is
substantially parallel to the top work surface 16, and the second
portion 78 of the feather flap 72 forms an acute angle with the top
work surface 16. The first and second portions 76, 78 of the
feather flap 72 have rectangular shapes in cross-section
perpendicular to their longitudinal lengths.
[0046] Referring to FIG. 2, holes 70 for the feather flaps 72 can
be provided at various locations in the fence front 38 to allow for
flexibility in placement of the feather flaps 72. The feather flaps
72 can be used with various types and sizes of workpieces due to
the various locations of the holes 70. For example, upper holes 70
have a higher vertical elevation above the table top 12 than lower
holes 70 so that the feather flaps 72 can be used with various
thicknesses of workpieces.
[0047] Referring to FIGS. 1, 2, and 6, the router table 10 has a
switch box 80 mounted to the table top 12. The switch box 80 has an
electrical plug 82 extending from a housing 84. At least one
electrical outlet 86 is provided on a bottom side of the housing
84. An electrical ON/OFF switch 88 is provided on a front side of
the housing 84. The ON/OFF switch 88 has safety key 90 which is
engageable and disengagable with the ON/OFF switch 88 to enable and
disable the switch 88. A resettable circuit breaker 92 provides
electrical overload protection for the switch box 80.
[0048] Inside the housing 84, the switch box 80 is wired such that
the electrical plug 82 provides incoming power to the ON/OFF switch
88. The ON/OFF switch 88 is wired to the outlets 86 and turns the
power ON or OFF to the outlets 86 depending on whether the safety
key 90 is in the switch 88 and the position of the switch 88. The
circuit breaker 92 is wired between the electrical plug 82 and the
switch 88 to cut power to the switch 88 and the outlets 86 and turn
off the router or other device plugged into the outlets 86 during
an overload situation.
[0049] An alternate embodiment of the inventive router table can be
seen in FIG. 8. In FIG. 8, the router table 110 has a flat table
top 112 and four support legs 114 attached to the underneath of the
table top 112. The table top 112 has a top work surface 116 for
supporting a workpiece when routing. Leg extensions (not shown) can
be attached to the support legs 114, if desired. Various mounting
holes (FIGS. 13, A-H) are provided to mount various routers to the
router table 110 underneath the table top 112. A router bit hole
120 extends through the table top 112 for a router bit 22. The
router table 110 has a switch box 180 mounted to the table top 112.
A safety shield 24 is provided to protect the operator of the
router table during routing. The router table 110 also has a
workpiece fence system 134 for guiding the workpiece during
routing. The alternative embodiment shares numerous similar
features with the previously described embodiment, but there are
also a number of additional features.
[0050] Referring to FIGS. 8 through 10, a miter guide 200 is
provided for feeding a workpiece 250 into the router at various
angles. Note that FIG. 8 shows a standard miter guide 200; however,
the inventive miter guide 200 shown in FIGS. 9 and 10 can also be
utilized with the router table. Although the inventive router guide
200 is illustrated as being used with a router, it is understood
that this router guide could be used with a shaper, a mill, a
sanding machine, a band saw, or any other tool that fits the miter
guide 200 and that permits feeding work at an angle.
[0051] The miter guide 200 comprises a protractor 202, the
protractor 202 having an approximate D-shape, or a half-circular
shape, being flat on a side that interacts with the workpiece 250
providing force in a horizontal direction, and circular shape on
the other side. The protractor 202 also comprises a protractor
adjustment slot 204 that is parallel the half-circular shaped edge
of the protractor 202 (permitting angular adjustment of the
protractor) and an angular scale comprising angular measurement
indicator. The protractor 202 may be constructed of any material
that is rugged enough to serve the purpose of feeding a workpiece
250 into the router, such as cast steel or plastic.
[0052] The miter guide 200 also comprises a miter bar 214 that is
attached to the protractor using, for example, bolt 218 that passes
through a bolt hole 217 in the miter bar 214 and that may screw
directly into the base of the protractor 202. The miter bar 214 may
also be attached to the protractor 202 using a bolt 216 that passes
through the protractor adjustment slot 204 and that further screws
into a knob 210 after passing through a washer 212.
[0053] The miter bar 214 is designed to ride inside of the miter
guide channel 162 (FIG. 8) and permit movement of the miter guide
in a linear direction parallel to the front edge of the table top
112.
[0054] The angle of the protractor 202 may be adjusted by loosening
the knob 210, adjusting the router to the correct angle, and
tightening the knob 210 so that the angle of the protractor does
not change. The angle adjustment is assisted by a miter pointer 206
having a positioning mark, the miter pointer 206 being affixed to
the miter bar 214 with a screw 208.
[0055] The miter guide also comprises a slide guide 220 that may be
designed to fit into slide guide slots 230 on the flat side of the
protractor. The slide guide 220 is a strip of resilient material
that has been formed to have a flat end fitting into the slide
guide slots.
[0056] Note that other mechanisms for attaching a slide guide 220
to the protractor 202 are possible, as are other physical shapes
for the slide guide 220. What is important is that a resilient
element is physically attached to the protractor that applies
pressure to the workpiece 250 and stabilizes its relative position
by using friction resulting from this pressure.
[0057] This slide guide 220 helps to hold the workpiece 250 firmly
in place by applying pressure in a downward direction to force the
workpiece 250 against the table top 112 creating friction that
helps prevent movement of the workpiece at an angle other than that
permitted by the protractor 202.
[0058] In the exemplary embodiment, the slide guide 220 has a
flattened end 222 that is inserted into one of the slide guide
slots 230. The flattened end extends horizontally for approximately
3 cm before the first curve. Proceeding from the flattened end 222
to the workpiece contact end 228 is a downward sloping region 224
of a length approximately 4.5 cm that turns into a contacting bend
226. The contacting bend 226 is the portion of the slide guide 220
that delivers the downward force to the workpiece 250. The
contacting bend is adjacent to the workpiece contact end 228 of the
slide guide 220. The contact end 228 of the slide guide 220 is
approximately 2 cm in length. In the exemplary embodiment, the
slide guide 220 has a width of approximately 2 cm, and a thickness
of approximately 3 mm. It may be composed of a material such as ABS
plastic. These precise dimensions are not crucial--it should be
understood that what is important is that the slide guide 220
serves to hold the workpiece 250 firmly in place by applying
pressure in a downward direction.
[0059] More than one slide guide slot 230 may be provided that
permits a height adjustment of the slide guide 220 so that the
miter guide 200 can accommodate various wood thicknesses and/or
apply varying amounts of force to the workpiece. It is to be
understood that the particular shape in the embodiment described
above is not the only shape possible. Numerous shapes can be
utilized in addition to the one mentioned above. For example, the
bend could be cut at its center, leaving the workpiece contact end
to be an actual end in contact with the workpiece 250. What is
important is that the slide guide provides a mechanism for
delivering a downward force on the workpiece 250 against the table
top 112 for stabilization. Furthermore, other mechanisms for
attaching the slide guide to the protractor are possible, such as a
screw, nut and bolt, etc., that can easily be envisioned by
practitioners in the field.
[0060] The protractor 202 also comprises hold-down slots 232 that
can be used for affixing a larger push surface to the flat side of
the protractor 202. When used, a large push surface (such as a
board) can be fastened to the protractor 202 using fasteners that
are placed through the hold-down slots 232.
[0061] In this alternative embodiment, the featherboard flaps 172
(FIGS. 8, 10) comprise a flat L-shaped strip of resilient material,
the L-shape defining two legs: a mounting leg that attaches to the
flat table top 112 or the workpiece fence 134, and a workpiece
contacting leg that applies force to a workpiece. The two legs may
be of varying lengths, thus defining a long leg and a short leg.
The short leg may be either a mounting leg or a workpiece
contacting leg, and visa versa.
[0062] The featherboard flaps 172 provide support for the workpiece
by holding it securely, which helps to minimize chatter and
kickback.
[0063] The featherboard flaps 172 may be made of any resilient,
non-rigid material such as plastic (e.g., ABS) or metal that
inserts into the featherboard flap holes 166 (FIG. 8) of the
workpiece fence 134. The featherboard flap holes 166 may be angled
such that the mounting leg of each featherboard flap 172 is
inserted at an angle so that the workpiece leg of the L-shaped
strip defines a line that does not intersect the flat table top 112
perpendicularly, but rather intersects it at an angle so that the
resilience in the workpiece contact leg provides downward pressure
to the workpiece in a direction perpendicular to the surface of the
flat table top 112, thus utilizing friction between the table top
and the bottom surface of the workpiece to stabilize the position
and movement of the workpiece. Additional friction is provided
between the bottom edge of the featherboard flap and the top
surface of the workpiece for position and movement
stabilization.
[0064] An additional featherboard flap 172 of the shape described
above may have its mounting leg inserted into a featherboard flap
hole 164 of the flat table top 112 at an angle that provides a
force in a similar manner described above, with the exception that
the workpiece contacting leg of the featherboard flap is inserted
at an angle such that the workpiece leg of the L-shaped strip
defines a line that does not intersect the front surface of the
workpiece fence 134 perpendicularly, but rather intersects it at an
angle so that the resilience in the workpiece contact leg provides
inward pressure to the workpiece in a direction perpendicular to
the front surface of the workpiece fence 134.
[0065] The holding pressure of the featherboard flaps 172 can be
varied by switching between putting the long leg or the short leg
of the featherboard flaps 172 in the featherboard flap holes 164,
166. The holding pressure can be further varied by varying the
length of the exposed mounting leg.
[0066] The featherboard flap 172 may be constructed having a
thickness of 3 mm. The width of the featherboard flap may also be
constructed as having a width of approximately 2 cm. When the
featherboard flap is constructed as having different length legs
for the L-shape, the longer leg may be approximately 10.5 cm in
length (total length from edge to edge), and the shorter leg may be
approximately 6.5 cm in length (total length from edge to edge).
The featherboard flap 172 may have a hole drilled in one end
through which, for example, a pin can be driven to keep the
featherboard flap 172 in the featherboard flap holes 164, 166.
[0067] According to FIGS. 11 and 12, a dovetail/boxjoint bar 302
may be provided for producing dovetail joints, box joints, and
combination joints. The dovetail joint bar 302 is a bar that may
have a rectangular cross section and that may be affixed in any
suitable manner to the flat table top 112 that permits a horizontal
position adjustment; in the exemplary embodiment, the
dovetail/boxjoint bar is mounted directly on the flat table top
112.
[0068] In this exemplary embodiment, the dovetail joint bar 302 is
affixed to the table top 112 utilizing dovetail/boxjoint bar
sliding screws 314 placed through respective mounting holes 304 of
the dovetail bar 302 and dovetail bar mounting slots 306 of the
table top 112. The dovetail bar mounting slots 306 permit the
dovetail joint bar 302 to be moved in a horizontal direction (i.e.,
the bar forming a perpendicular to the front face of the workpiece
fence 134) toward and away from the router bit 22--any given
position thus being defined as the horizontal position of the
dovetail bar 302.
[0069] Dovetail nuts 216 are attached to a threaded end of the
sliding screws 214 to securely mount the dovetail bar 302 to the
table top 112. The horizontal position of the dovetail bar 302 is
defined by using a spacer bar 210 that corresponds in with to the
router bit 22 and the dovetail/boxjoint bar 302; the width of the
dovetail/boxjoint bar 302 should match the width of the router bit
22, which may be, for example, 3/8" or 1/4" (the spacer bar is
removed during operation; it is only used to space the
dovetail/boxjoint bar 302 from the router bit 22). This method of
fastening the dovetail/boxjoint bar 302 described above is
exemplary, and it is to be understood that other mechanisms for
affixing the dovetail/boxjoint bar 302 to the table top 112 are
within the scope of the invention.
[0070] According to FIG. 12, combined workpieces 318 (shown
staggered), are shown using the dovetail/boxjoint bar 302 for
spacing the cuts. A previous cut is placed over the
dovetail/boxjoint bar 302 and the combined workpieces 318 are moved
in a direction parallel to the dovetail/boxjoint bar 302, thus
producing another cut. This new cutout is then positioned over the
dovetail/boxjoint bar 302 and the process is repeated.
[0071] The use of a single isolated bar as the dovetail bar is
advantageous in that it represents an inexpensive and easy to use
mechanism for creating dovetails and other types of joints.
[0072] FIGS. 13 and 14 illustrate the inventive hole pattern for
mounting various routers to the router table. The four holes
designated with the reference character A form a group (Group A) of
holes used to mount a square adapter plate (not shown) that can be
drilled out for routers that mount with a hole pattern different
from those provided by the invention. The precise position of the
Group A holes is not critical, provided they match the hole
positions provided in the square adapter plate.
[0073] The four holes designated with the reference character B
form a group of holes (Group B) used to mount a type-B router to
the router table. Examples of such type-B routers are Ryobi.RTM.
models R160K, R160V, R165 and R180, and Craftsman.RTM. models
27500, 27510 and 27511.
[0074] The two holes designated with the reference character C form
a group of holes (Group C) used to mount a type-C router to the
router table. Examples of such type-C routers are Ryobi.RTM. models
R174 and RE175.
[0075] The relevant information pertaining to the holes in Group B
and Group C is as follows:
2TABLE 1 Measurement (distances Feature in mm) Description RBC
60.97 The distance from the router bit hole 120 center to the
center of holes B2, B4, and B1C1. RBC1 58.36 The distance from the
router bit hole 120 center to the center of hole B3C2.
.theta..sub.B2, B3C2 106.degree. The angle separating the centers
of holes B2 and B3C2 with respect to the center of the router bit
hole 120. .theta..sub.B3C2, B4 74.degree. The angle separating the
centers of holes B4 and B3C2 with respect to the center of the
router bit hole 120. .theta..sub.B4, B1C1 119.degree. The angle
separating the centers of holes B4 and B1C1 with respect to the
center of the router bit hole 120. .theta..sub.B1C1, B2 61.degree.
The angle separating the centers of holes B2 and B1C1 with respect
to the center of the router bit hole 120. R.sub.BL 4.1 The
non-countersink radius of holes in hole groups B and C at a bottom
surface. R.sub.BU 8.25 The countersink radius of holes in hole
groups B and C at an upper surface. D.sub.B 6.25 The depth of the
countersink of holes in hole groups B and C.
[0076] The three holes designated with the reference character D
form a 440 group of holes (Group D) used to mount a type-D router
to the router table. Examples of such type-D routers are Porter
Cable.RTM. models 690 and 6931.
[0077] The relevant information pertaining to the holes in Group D
is as follows:
3TABLE 2 Measurement (distances Feature in mm) Description R.sub.D
58.75 The distance from the router bit hole 120 center to the
center of holes D1, D2 and D3. .theta..sub.D1, D2 120.degree. The
angle separating the centers of holes D1 and D2 with respect to the
center of the router bit hole 120. .theta..sub.D2, D3 120.degree.
The angle separating the centers of holes D2 and D3 with respect to
the center of the router bit hole 120. .theta..sub.D3, D1
120.degree. The angle separating the centers of holes D3 and D1
with respect to the center of the router bit hole 120. R.sub.DL 2.9
The non-countersink radius of holes in hole groups D and E at a
bottom surface. R.sub.DU 5.25 The countersink radius of holes in
hole groups D and E at an upper surface. D.sub.D 4 The depth of the
countersink of holes in hole groups D and E.
[0078] The three holes designated with the reference character E
form a group of holes (Group E) used to mount a type-E router to
the router table. Examples of such type-E routers are Skil.RTM.
models 1823, 1835 and 1845-02, and Craftsman.RTM. models 17504,
17505, and 17506.
[0079] The relevant information pertaining to the holes in Group E
is as follows:
4TABLE 3 Measurement (distances Feature in mm) Description R.sub.E
59 The distance from the router bit hole 120 center to the center
of holes E1, E2 and E3. .theta..sub.E1, E2 120.degree. The angle
separating the centers of holes E1 and E2 with respect to the
center of the router bit hole 120. .theta..sub.E2, E3 120.degree.
The angle separating the centers of holes E2 and E3 with respect to
the center of the router bit hole 120. .theta..sub.E3, E1
120.degree. The angle separating the centers of holes E3 and E1
with respect to the center of the router bit hole 120.
[0080] Note that the radius and countersink dimensions for holes in
group E are identical to those in group D.
[0081] Two holes designated with the reference character F form a
group of holes (Group F) used to mount type-F rotary tools to the
router table. This group includes Dremel.RTM. Hobby tools and other
similarly configured rotary tools.
[0082] Hole G is provided as a threaded hole for a pilot pin. Hole
H is provided as a pilot pin storage hole, and the slots I are the
dovetail/boxjoint fixture mounting slots 306.
[0083] FIG. 14 illustrates the mounting of a router to the table.
Router 142 is inverted and attached to a bottom surface of the
table top 112, using a fastener 146 that passes through one of the
table top holes and into a router hole 144.
[0084] While the presently preferred embodiments have been
illustrated and described, numerous changes and modifications can
be made without significantly departing from the spirit and scope
of this invention. Therefore, the inventor intends that such
changes and modifications are covered by the appended claims.
* * * * *