AUTOMATIC STOP JIG

MONTAGE A ARRET AUTOMATIQUE

English Abstract

A miter saw or radial arm saw accessory comprising of a moveable stop- structure. Designed to function as a workpiece restraining stop by default. It is propelled by means of an apparatus composed of electrical or mechanical elements that move the stop- structure away from or towards the sawblade. As this apparatus is activated by the saw switch or other means, it moves the stop-structure away from the sawblade and into a non-restraining position. As a result this frees the restrained workpiece, that otherwise would be forcibly jammed during the sawing process.

French Abstract

Un accessoire de bras de scie à onglets ou de scie radiale comprenant une structure d'arrêt mobile. Il est conçu pour fonctionner comme une butée de retenue de la pièce par défaut. Il est actionné au moyen d'un appareil composé d'éléments électriques ou mécaniques qui déplace la structure d'arrêt à l'écart ou en direction de la lame de scie. Lorsque cet appareil est actionné par l'interrupteur de la scie ou par un autre moyen, il déplace la structure d'arrêt à l'écart de la lame de scie et dans une position de non-retenue. Par conséquent, cela libère la pièce retenue qui autrement serait bloquée de force pendant le sciage.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1: A Radial and Miter Saw accessory which enables a safer and more rapid
process for
repetitive cutting procedures.
2: An aligned extension of the existing saw table and fence.
3: A C-channel to be installed behind and along the extended fence.
4: A hold down clamp provisioned to slide in said C-channel as defined in
claim 3.
5: One of many implementations of this automatic fence stop concept herein
labeled as
Model A comprising of the following claims.
6: A mounting board onto which is mounted C- channel containing a sliding
metal bar.
7: A wooden fence stop installed onto the sliding metal bar as defined in
claim 6.
8: A solenoid mounted at the end of the C-channel as defined in claim 3.
9: A brace linked between a solenoid and a specially shaped T-bracket.
10: Said specially shaped T-bracket is hinged to the sliding metal bar as
defined in claim
6 and will maneuver in a swing-like fashion and slide when pulled by the
activated solenoid.
11: Said T-bracket is machined to contain a rectangular shaped cut out
12: A metal step configurated to fit into the T-bracket's cut-out is affixed
to thetop of the
C-channel and located below the T-bracket's cut-out.
13: A spring is connected to the very front of the jig via a bridge bracket
and other side
of the spring is attached to the T-bracket as defined in claim 9.
14: Said spring will pull the described assembly towards itself and will also
lock the
T-bracket into its cut-out, thereby locking the fence stop in stable position.
15: There is a spring attached to the end of the sliding metal bar in order to
take out any
slack among the connections.
16: The electricity for the solenoid is supplied over the saw switch via an
extra installed
8

conductor.
17: A capacitor might be needed to prolong the deactivation time until the saw
blade
comes to a hold.
18: Another means of triggering the solenoid is via a current sensing relay
which would
be inductively coupled to the power line of the saw.
9

Description

CA 02270693 1999-OS-07
Automatic Jia Stop
Page 2
I. This invention is designed for Radial Arm and Miter Saws. It enables the
cutting of wood in a safer and fasterW ay, making the work place a much more
frustration free environment. This automatic jig stop is a new technique of
operating
these types of saws as opposed to the common cutting procedures. It is a new
tool for
single and repetitive cuts of variable dimensions. There is a need for this
functional
idea in private or business situations. It is an improvement to the existing
technology.
Traditionally, cutting in single or repetitive fashion means that the piece to
be
cut off is positioned between the stop located on the left side of the saw,
and the saw
blade. It is secured against the fence by the operators left hand. The saw
carriage is
then positioned and the wood is cut. This is the accepted way, however often
dangerous and accident causing (especially when the desired wood piece is
small).
The following instructions will explain the improvements made by this new
invention.
Specification
II. In order to be able to operate this jig the following specifications have
to be
met: The existing saw table & fence has to be extended to a total measure of
approximately 30 inches in length (measured from the saw center to the right).
The
width should be about 10 inches. This installation serves as a good extended
saw
table for general purpose cutting as well. A piece of plywood, level with the
saw-table
top and a 3/4" x 3/4" strip of wood aligned with the existing fence of the saw
has to be
mounted beside the saw {see general top view). Subtract 1 /2 of the existing
saw table
(which amount to about 10 inches) from the 30 inches that are required,
leaving 20
inches in length for the plywood board.
Furthermore, a movable hold down clamp on a sliding extrusion should be
installed in
order to position the jig stop at the desired location for the wood to be cut.
Follow the operating instructions in III.
Instructions
III. A hold down clamp on the extended right hand table holds the automatic
jig
in the preset/desired stop position (see II). The saw operator positions the
entire piece
of wnad with his left hand against the.fence_ Then, the piece of wood to be
cut aff is
gently moved towards and against the automatic jig stop of the invention. It
is held
there safely; far away from the teeth of the blade. The arm of the saw blade
is then
positioned over the wood and the saw is switched on to cut the wood. During
this
procedure, the automatic jig becomes activated until the cutting procedure is
completed. After the saw blade comes to a stand still, it is moved out of the
way and
the automatic jig moves_back to its mechanically designed stop position. The
"out-off
piece", which is resting loose on the right hand side of the saw table, is
then ready to
be removed. Most saws today have built in automatic brakes and are well suited
for
this operation. It is important to understand, that this kind of stop-release
mechanism

CA 02270693 1999-OS-07
page 3
prevents "cut-off pieces" from being jammed, damaging the saw blade
or fence, or flying and inuring the operator.
The operation can be repeated over and over again.
Descriptions of functions
IV. As the the switch is turned on to cut the wood, the automatic jig
invention
becomes activated by moving the "jig-stop" out of the way from its
mechanically
designed "stop" position. The wood, which was pushed against that stop, is now
no
loner confined between the blade and the automatic jig-stop of this invention.
However, the wood stays in the desired cutting position because it is still
firmly held by
the operators left hand far away from the teeth of the blade.
The automatic jig's movements are mechanically activated by a solenoid via a
current-sensing relay. The use of an electrical motor instead of a solenoid,
is another
passibility_ :The current sensing relay (inductively coupled to the power line
of the saw)
"senses" the electricity floating to the running saw motor and by means of
internal
contacts, gives electricity to the solenoid of the invention. Therefore, the
solenoid stays
activated as long as the saw is switched on. Furthermore, as the cutting is
completed,
the relay becomes deactivated and the jig goes back to its mechanically
designed stop
position.
This invention can be built to be operated manually, or be driven by a
solenoid
or electric motor. The Current sensing relay used for all models is not a "do
it yourself
project", it is a unit made by relay companies and is available in electronic
specialty
stores.
This application is an attempt to cover the basic invention of an
automatic.jig
stop (as described) with all possibilities of different mechanical driving
systems. Some
driving systems are shown and demonstrated in the following diagrams. All
shown
models are available and functional.
Parts
V. Extrusion 7 1 /2" long
Metal bar 8" long
Parts according to models
Metal cover for the mechanics 10"(L) x 4"(W) x 2-1/2"(H) approx.
Hold down clamp
electrical

CA 02270693 1999-OS-07
page 4
automatic jia stop
general top view for model 1,2 and 3
This is the top view of the automatic jig invention with the added plywood saw
table and the
extended fence. Note: drawings are not to scale. Abbreviation for center to
center: "c-c"
Extrusion
extended fenc
original miter saw fence
extended table
Saw center 30" from center
(1 ) The automatic jigs mechanism is covered in metal enclosure.
( 2 ) The wiring goes to an electrical outlet, which is controlled by the
sensing relay.
( 3 ) A hold down clamp is mounted on an sliding extrusion enabling it to hold
the
automatic jig in the desired positions for wood cutting
The following instructions are for model 1, 2 and 3, which are
available and in working order.

CA 02270693 1999-OS-07 ~~ ,..~,:a .."~.;~,~"","",,r~~
Page 5
_automatic iia stop model 1
side view in non activated mode
The mechanics are covert by a metal enclosure (not shown) which is about 12"
long and mounted
on a 24" x 4" wooden board. Except for the mechanics, the instructions and the
electrical
connections, are similar for models 1, 2 and 3. -
a) metal brace The solenoid is mounted on a block of wood or plastic
3 Bridge bracket for softer operation due to solenoid impact.
same for models 2 and 3
1
All moving parts connected to and running
in the extrusion are referred to as: the carriage
wood stop ~ ' ,~ assembly.
i ~ b) This small brace, which holds and hinges the T-bracket is welded to the
1 1/2" metal bar which runs along the inside of the metal extrusion. The wood
stop
and the carriage assembly are also attached to this metal bar.
c) This metal step-stop is mounted solid and causes the T-bracket to unhook or
dead lock.
I d) The metal extrusion enabling the metal bar to slide inside.
e) The metal bar running back and forth al
ong the inside of the extrusion
1 T-bracket
This T-bracket is hinged by a small brace to the sliding metal bar and
linked to the solenoid. The activated solenoid rocks the T-bracket to the
unhooked position. As soon as the solenoid is deactivated, the T-bracket
engages itself back into-the dead lock position via a spring. This design
has the least movement toss" over the other models.
2 This spring pulls the T-bracket and the connected carriage assembly back to
its set position.
The spring is attached to a bridge-bracket (3) at the front of the jig and at
the upper T-bracket.
2
automatic 'ia model 1
~~~,,. ~. -
'' side view of in activated mode
. . W . , ,s"~;~" ~ . . ~ ... . .... . . .~'"~"'~1
Top view of non-activated mode. For clarity, shown only with the step-stop and
the open extrusion
with the inside metal bar and the solenoid.
~,. .-.;,.. . .t~----r.-=.-,.;~: f ----~"
,__
.". ...::.r ~ .~I
w~~.:~s~.,
wooa stop .~"~~~F~~~
step stop
~..
As wood to be cut is pushed against the jig stop, this hidden spring (4) takes
out any
possible slack caused by the slightest movements of the hinged metal braces.
Hence the cut wood
pieces are always of the same exact size.

CA 02270693 1999-OS-07
Page 6
automatic jig stop modal 1 continued
Parts & Dimensions
Remarks
Abbreviations in model 1, 2 and 3: c-c means markings measured center to
center.
In all models, a dimensional flexibility in the c-c specifications of the
brace exists in
order to find the ideal balance between the solenoids strokes and power, and
the
resulting "away" or "inward" movement of the wood stop.
Part Numbers
1) T-bracket: 3" x2" high, the two holes are 1" apart
2) Extension spring: 3116" dia.
3) Bridge bracket: a metal bar bent to bridge over the extrusion. It is
screwed
dawn on bath sides of the extrusion. Sea model 1
4) Extension spring attached to sliding metal bar
a) metal brace: holes are 2" center to center
b) small brace: 3/4" high, the hole is in the center
c) step stop: 2" x 1/2" metal bar mounted across and on top the extrusion. It
has
to fit snugly into the T-bracket.
d) metal extrusion: 7-1 /2" long
e) metal bar: 8" long. The wood stop is screwed to one end of this bar.
llllood board and wood stop: 24" x 4" x 1 /4" high and 1 1 /2" x 2" x 3/4"
high,
The solenoid is mounted on 3/4" block.
The metal enclosure is approximately 12" x 4" x 2" high
see diagrams

CA 02270693 1999-OS-07 . .._,r , ~,~...w,., ,.....~..a,,.~..,,.:.~.,~"
Page 7
automatic iio stop
top view of model 2 in non activated mode
dia4ram exnlanations~
angle iron is hinged here, far on the outside
~''ri ,.. -.. ~~ ti
"",-
* 3/4"X 24" wood base
Solenoid 1-1/4" stroke
a) 2 metal braces. Holes are 1-1/2" c-~, linked to the solenoid
b)1 brace has 1-1/4" holes c-c, the other brace has 3" holes c-c .When
deactivated, the
movement is mechanically stopped from going further to the left by the
overlapping
nozzle * (note the little overlapping nozzle on larger brace).
c) Wood.stop mounted to an 4" X 2" angle iron. Please note the hole where the
angle iron is hinged.
automatic iia stop
Top view of model 2 in activated mode
2
( 1 ) spring is for bringir~ the movement back to the non activated position.
( 2) spring is for taking any slack out when operating the saw.
This model 2 jig_ can also be built to be hand operated. The stop would have
to be modified and
extended at a right angle towards the operator by a 3>4" square piece of wood
about 12" long. The
jig is clamped against the extended fence in the same fashion as the other
jigs. As the wood is
being out the operator has to move the stop in and out by hand. This requires
simultaneously
thinking about cutting and the jig operation. Due to noise and the monotony of
this work, it can lead
to accidents.

CA 02270693 1999-OS-07
Page 8
model 2 continued
Parts and Dimensions
a) 2 braces, each with holes 1-1/2 " center to center
b) 2 braces, one with holes 1-114" c-c, and the other with holes 3" c-c.
The overlapping nozzle is soldered to this larger brace
c) Angle iron, measuring 6" x 2". The hinging holes measured from left to
right:
1-1/2" and 4-3/4" (see drawing).
1 ) Spring for bringing movement back: 3/16" dia.
2~ S.pring for taking out any slack: 3/1 fi" dia.
For more information see model 1.

CA 02270693 1999-OS-07
Page 9
Diaclram explanations:
1w
automatic jia stop
side view of model 3 in non activated mode
solenoid
wood stop I a) metal extrusion.
b) small stationary brace, holding and hinging the corner bracket.
c) 90° cornerbracket.
d) small brace welded to the sliding bar
which is running along the inside of the extrusion.
e) sliding metal bar.
'l This spring pulls back the whole assembly to its set position when
deactivated.
Shown is the unmounted bridge bracket to which spring is attached.
automatic jia stop
side view of model 3 in activated mode
automatic jig stot~
top view in non-activated mode
t .
~:.~ar~au~,~..~,rw~~s~,m~arxuu~anwem~auxwer~v"
~ small stationary [ 2 shown without mechanics
f?race
2 This spring is connected to.the end of the sliding metal bar inside, and
causes a
strain on the assembly when deactivated. Thus taking out any slack when wood-
pieces are. pushed against the stop before cutting begins.
Spring is omitted because it is shomrn in itte nQn activated diagram above

CA 02270693 1999-OS-07
page 10
model 3 continued
Parts arrc~ Dimensions
a) metal extrusion: 7-1 /2" long
b~ small brace: This 3/4" high brace is actually 2 bent brackets screwed down
on both sides of the extrusion. Its purpose is to hinge the corner bracket.
c) 90 degree corner bracket: one hole is 3/4" up from the corner hole, the
other
hold is 1-1 /4" to the left and is connected to a brace with 1-1 /4" holes c-c
(The 3/4" hole in the corner bracket is further apart in the drawing than in
the
actual model. Building it this way would result in an acceptable,
shorter inward stroke distance of the wood stop).
d) small brace: This 3/4" high brace which is linked to the brace above (see
c),
and is welded to the sliding metal bar.
e) metal sliding bar: 8" long
l~ Spring: 3/16 dia. Connected to the corner bracket and the bridge-bracket.
The bridge bracket is shown unmounted.
2~ Spring:.3/16" dia. steadily pulling back the metal bar.

Representative Drawing