CA2372484A1 - Compact sliding compound mitre saw - Google Patents
Compact sliding compound mitre saw Download PDFInfo
- Publication number
- CA2372484A1 CA2372484A1 CA 2372484 CA2372484A CA2372484A1 CA 2372484 A1 CA2372484 A1 CA 2372484A1 CA 2372484 CA2372484 CA 2372484 CA 2372484 A CA2372484 A CA 2372484A CA 2372484 A1 CA2372484 A1 CA 2372484A1
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- CA
- Canada
- Prior art keywords
- saw
- pivot arm
- rotunda
- pivot
- slide rails
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/04—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever
- B23D45/042—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever
- B23D45/046—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever the pivoted lever being mounted on a carriage
- B23D45/048—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever the pivoted lever being mounted on a carriage the saw blade being adjustable according to angle of cut
Abstract
A sliding compound mitre saw more compact in arrangement than known existing art, yet retaining all the advantages of the existing art, with in addition to the advantages oaf very compact arrangement, ha-ving the advantages of imposing less bending moment on the axial sliding bearings, thus improving accuracy and tending to avoid "stiction", and having critical parts out of harm's way.
Description
~' a a 2 , ~~ompact Sliding compound Mitre Saw. g FlEhD OF THE INVENTION.
'This invention relates to power tools intended to sever long mate-rials in two pieces for each cut, ~~ore particularly, the invention will have its primary use in woodworking.
Compact eliding Uompound Mitre haw. Yage 3.
BACKGRUU1~D OF THE 1NYEN'1'ION.
It is known in the art relating to woodworking that the smoothest cut is obtained when the cutting teeth o.f the circular saw blade exit the material at as small an angle as possible. wood fibres tend to tear out at the surface when the cutting teeth exit at lar-ge angles and this problem is unacceptable for accurate finishing work where appearance is paramount. 'lo overcome this problem, the sawbla de must enter the flat lying piece of material from above, and at the same time the circular blade Must be large enough to complete the cut without having the teeth exit the material at a large angle. At the same time the blade must be prevented from wob-bling due to lack of support or due to lack of rigidity in the ma-chine members controlling the Planar motion of the blade, as well as due to play in any supporting bearings controlling the planar motion of the blade. ffo accomodate these demands the existing "com-pound mitre saw".was created. '.~'he saw mechanism is a compact direct drive unit provided with a very rigid pivot arm, which is provided v~ri.th rugged and accurate pivot means at its far end, which in turn is rigidly mounted to the surface which supports the material to be cut. '1'o prevent the material from moving while being cut, a ri-gid "fence" is Provided, against which the material is held by the human operator; or the material may be clamped in place. 'lo allow bevel cuts, the pivot means, above, itself is provided with a bevel pivot means , the axial centerline of which lies on the centerplane of the saw blade, as well as lying on the special-extension of the supporting surface far the material to be cut. '1'his ensures that the saw blade enters the same slot in the supporting surface. 'fhe bevel pivot means is looked solid during a cut so that any play in 'Compact Sliding compound Mitre Saw.
Page ~.
its mechanism is cancelled out in an effort to maintain accuracy of the cut. To allow angle cute, known as "mitre" cuts in the ~~S.A.~
the supporting surface for the material to be sut consists normally in the form of a "rotunda", a rigid horizontal disc, rotatably moun-ted in a main table, and locked during a cut. 'The vertical axis of rotation for the rotunda lies approximately under the center of the saw blade to allow for the same capacity of the cut whether a right hand or left hand mitre cut is made. The above fence spans across the rotunda without contacting it, and is rigidly fastened to the main table at each end, where the main table protrudes sideways from the rotunda. While all the above accomodations to ensure "c'?eanliness" and accuracy of cut, so paramount in finishing work, have admirably been met in the existing art, the next most impor-tant asset of the art, compactness and light weight, did not go un-noticed to woodworkers engaged in other than finishing woodwork, where rough cuts due to fibre breakout are not objectionable. 'The problem was that previously existing units did not have enough cross cut capacity. '-~'o accomodate this new demand for greatly incre-ased cross cut capacity, the sliding compound mitre saw was created in two known forms. In one form, the rotunda is provided with two horizontal axial bearings, parallel to each other and parallel to the centerplane of the saw blade. Slideably disposed in said bear-ings are a pair of rigid steel tubes extending backwards and suppor-ting the normal conventional bevel pivot boas at the far ends mutu-ally. Said boss in'turn supports the conventional pivot arm pivot and thus the pivot arm and saw mechanism, with the pivot arm longer than those on non-sliding saws, to allow for a greater throat depth.
'Throat depth in the case of machines as described herein, is the Compact Sliding Compound Mitxe haw. fags 5.
distance from the edge of the material to be cut nearest to the hu-man operator, to the vertical obstruction composed by the bevel pi-vot boss and its upward extending pivot arm pivot tower. 'this full throat depth cannot be utilised because the bevel pivot boss and pi-vot arm pivot tower arc toward the human operator against the back-side of the fence when the rotunda is adjusted for a mitre or com-pound cut; it is also for this reason that the fence is located well forward of the bevel pivot bass. wince sliding action causes fibre breakout at the cut, the operator does not use it to cut finishing lumber; instead the saw is located above the material and simply brought down into the material as in conventional saws of this kind, with only the extra precaution required of holding the handle of the saw extra securely and firmly to prevent the saw from dumping for-ward towards the operator. Except for this extra precaution, and for the extra flexibility of the sliding tubes and any play in the axial bearings,, fir the sliding tubes, thus creating a greaterpotential for inaccuracy of the cut, the sliding compound mitre saw retains the primary advantage of the conventional compound mitre saw, namely the ability to bring the blade down into the material with less tendency for fibre breakout. In the second known form of the sliding compound mitre saw, the conventional location for the bevel pivot boss , that is directly mounted on the backside of the rotunda, is retained. 'l~hi8 boss is provided with a pair of mutually connected backward extending and slightly upward pointing arms, at the end of which a pair of parallel oriented axial beariz~,gs is provided; said bearings axially also parallel to the centerplane of the saw blade.
Disposed slideably in these bearings is a pair of slide tubes, at the near end of which a conventional pivot arm pivot is provided.
compact Aiding compound nitre haw. .gage b.
r'or the rest of a description, everything said above for the first form of a sliding compound mitre saw applies.
Compact :Aiding Oompound mitre haw. rage 7.
SU MNIARY OF THE 1?~TSIE','TT 102T .
'1'he present invention provides a sliding compound mitre saw having two primary advantages over the known existing art as described above, namely~ a pair of slide tubes is provided which do not extend backward from a ro'~unda, if a rotunda is used, thus providing for a more compact overall machine while in the rest position; and, sec-ondly, the axial bearings, disposed on said tubes, and allowing for the required sliding motion of the saw blades have a rigid relati-onship geometrically to the center of the saw blade, and by being located close to said center, are creating less bending moment, due to the weight of the saw mechanism and due to reaction forces acting on the saw blade while in use. Less bendingmoment on said bearings avoids stiction, allows smaller shorter bearings, and en-sures greater accuracy of the cut, with any play not magnified by an ever longer moment arm as is the case with the existing art in which the saw mechanism is displaced relative to the axial bearings.
'These and other features and advantages of the invention will be more fully understood from the following description of several preferred alternative embodiments taken together with the accompa-nying drawings.
Compact Sliding compound Nritre Saw. Page 8.
~3RTEF DESCRIPTION OF TH'E DRAWINGS.
The following definitions apply for the terms used in this disclo-sure. A "saw" is a ocular blade mounted an a rotating shaft, the "arbor", capable of severing, named the "cut", a piece of materi-al in two pieces, the whole piece being the "cut member". '1'he arbor has a gear at one end, which is driven by a pinion gear on the mo-tor; this arrangement is a "direct drive". Z'he cutting members on the circumference of the saw are the "teeth", but alternatively may be abrasives when cutting metals. '~-'he spatial extension in line with the centerplane of the saw is the "plane", or if descriptive of in-line motion of said plane, is "planar", vertical displacement of the plane is "chopping", while horizontal displacement in-line is "sliding". The housing supporting the arbor and enclosing the gears is the "gearbox". The horizontal surfaces defining a cut mem-ber are the "top" and "bottom" while the vertical surfaces are the "far" and "near" edges, with far and near relating to the location of the human operator. "Forward" motion means motion towards the human operator, and ''backward" motian means motion away from said operator.If a cut is square to all surfaces of the cut member, it is a "straight" cut. if square to the tog and bottom, but not to the edges, it is a "mitre" cutr If square to the edges, but not to the top and bottom, it is a "bevel" cut. If neither square to top and 'bottom nor the edges, it is a"compound"cut. '1'he motion of the saw is limited to circular and planar by machine members. Chop-p~ng motion is rigidly controlled by a "pivot arm", an approxima-tely horizontal longitudinal rigid machine member extending back wards from the gearbox, rigidly attached to same, and provided with a horizontal axis "pivot arm pivot", parallel to the arbor, at the compact Sliding compound PZitre Saw. rage 9.
far end. The arbor and saw travel through an arc about said pivot arm pivot during cutting and caused by the human operator. The pi-vor arm pivot is supported in the top of a vertical "pivot arm pi-vot tower.", which has a second pivot at the bottom end, said second pivot being the "bevel pivot" and having a longitudinal centerline which is parallel to the centerplane of the saws said l~gitudinal centerline or "aria" closely in line with, or in line with the sup-porting surface on the machine for the bottom of the cut member.
Said bevel pivot supported in and by a "bevel pivot boss" and rigs d 1y locked to said boss during a cut. The bevel pivot boss may be di:
rectly attached rigidly to the support surface for the cut member in a conventional machine, or, alternatively, may be rigidly atta a-ched to the far ends of a pair of "slide rails" controlling sliding motion of the saw, 1f used. ~y arranging the long axis of the bevel pivot to lie on both the centerplane of the saw as well as on the spatial extension of the support surface" the saw enters said sup..
port surface always in the same "slot" regardless of bevel adjust-went, making for a simpler usage of the machine. if above mentioned slide rails are deployed in the design of the machine, with the be-vel pivot boss rigidly attached to the far ends of said rails a first arrangement of existing art is arrived at. 2n this case the slide rails are axially slideably disposed in a pair of axial bea-rings, installed rigidly on the bottom of the suppirrt surface for the cut member. Alternatively, in a second arrangement of ex3.sting art, the bevel pivot boss is rigidly attao~.ed to the backward edge or near the backward edge, of the support surface for the cut mem-ber, as is the case with conventional arrangement of the art. howe-ver~ in this case, the bevel pivot boss is provided with a pair of Corlpact Sliding Compound r°litre Saw. ~;
.~a a 10 .
upward and backward extending arms, in the tap end of which are dis-posed a pair of axial bearings, with their long axis parallel to the centerplane of the saw. Supported within these axial bearings are a pair of parallel slide rails, slideably disposed. Rigidly at-tached to the forward end of said sliderails is a pivot arm pivot tower, which in form supports the pivot arm and gearbox in the con-ventional manner. In bath cases of the existing art of sliding com-pound mitre saws the pivot arm is longer than in the conventional arrangement, to create a deeper "throat depth", necessary to acco-modate the wider lumber far which these saws are intended. "Throat depth" is the horizontal distance between the near edge of the cut member and the vertical. obstruction created by the pivot arm tower.
hut this throat depth cannot be fully exploited 'because the conven-tional supporting surface for the cut member is a "rotunda", a flat horizontally disposed circular disc, provided with a i'rotating- wit-hin-limits" support means, having a vertical axis of rotation which lies close ~co the center of the saw. Since the pivot arm pivot tower arcs about the vertica7~ axis of rotation of the rotunfa, said tower moves forward when adjusting the rotunda for a maximum mitre cut, bringing said tower against the backside of a transversely arranged "fence", a barrier spanning across the rotunda and rigidly attached to the "main table", said fence lacau on within the "throat" of the machine thus limiting the useable portion of the throat depth. 'lhe fence has the dual function. of keeping the cut Member safely in pla-ce during cutting, as well as forming the reference surface for the degree of mite cut. The main table forms the base of the machine, rotatabl.y-within-limits aupportin.,g the rotunda, providing support for the locking means of the rotunda, and having laterally extending rage 11.
compact Sliding ~or~pound P'iitre :yaw.
swings" which have upper surfaces flush with the upper surface of the rotunda, providing additional support for the cut member. The "handle" is an attachment, rigidly mounted on the gearbox opposite the pivot arm, which the operator grips firmly to bring the saw down and through the cut. "counter. balance bias means" is a flexi-ble force means, constantly acting, of enough strength to keeep the saw mechanism sus-pended in the highest possible position allowed by "travel stops" on the pivot arm pivot, said travel stops limiting the upper and lower position of the saw, the lower position designed to provide for maximum overall cutting capacity of the saw. '1'he axis of rotation is the "long Axis'" . '~'he generic name for a complete saw of the kind described is a "sliding pivot arm saw", since all combine ne the motion of an arc provided by a pivot arm with the ability, if desired, to move the saw '~_inearly. The complete package of saw and its its drive is the "saw mount" . '~'he combines? ability of a mitre and a bevel cut makes the complete saw a "sliding pivot arm compound mitre saw"; if bevel cut ability is excluded, the saw is a "sliding pivot arm mitre saw". dust likes øhe long axis of the bevel pivot lies on both the centerplane of the saw as well. as on the spatial extension of the support gurface for the cut member, to ensure that the saw always enters the same clearance slot in the said support surface, regardless of bevel adjustment, so does the vertical axis of rotati-cm for the rotunda lie on the centerplane ref the saw as well as on i;he spatial extension of the working face of the vertical fence, to ensure that the saw always enters the same clearance slot in said working surface of the fence, regardless of mitre adjustment. laid clearance slot in the fence creates a left "wing" and a right wing compact :Aiding Uompound ~':itre :~s,w.
rage 12.
of the fence, said wings tied rigidly together by a horizontally ~.ying , crescent shaped, "~°ence bridge".
13R1EF DESURIPTI021 OF T~~E D.E~AWINGS , ( C ontinued . ~
1'IG.l is a simplified cross section, vertically taken, of the first y"orm of the existing art.
FIG. z is the same as above, of the second form of the existing art.
~~n both cases, the stroke of the sliding rail system has been incre-ased from known embodiments to accomodate the cutting of a 2 inch by ~_4~ inch size cut member, with drawings made to scale for better comes:.
parison purposes.
I'1G. 3 is a plan view of the embodiment of .~'ig. 2, to clarify the relationship between the components making up a typical embodiment of the known existing art.
compact Sliding ~%ompound nitre saw. rage 13.
FIG. a is a vertical cross section , taken on the centerplane of the saw , showing the vain novel feature of the invention, namely two slide rails rigidly supported at both ends underneath and by the rotunda, having slideable axial bearings disposed on said ri-gidly fixed slide rails, said bearings rigidly joined together by to saw carriage composed of a downward and forward extending rigid extension of the bevel pivot boss, which protrudes upward and for-ward through the rotunda.
I'1G. 5 is a view labelled ~ in I'ig. ~+, showing the end supports of the slide rails in the backward extremity of the rotunda, with also the clearance opening in the backward extremity of the rotun-da shown as required by the novel .,9aw carriage , as it travels backward during use of the saw.
FIG. 6 is an upward view labelled ~-~ in Fig. 5, showing the total-ly hidden and thin well protected novel fixed slide rails and slide-ably disposed saw carriage, provided with a clearance slot, if desi-red, for a vertical axis central pivot for the rotunda. The novel saw carriage, by virtue of its inherent rigidity, also allows the bevel pivot boss to become robustly integrated into said carriage, with the clamping force between the pivot arm pivot tower and the bevel pivot boss concentrated in a robust area close to the axial sliding bearings of the saw carriage.
FIG. 7 is a cross section labelled G-~ in fig. 6, rotated to the horizontal position, showing the relation between the clearance slot in the supporting surface of the rotunda for the cut member, and the novel saw carriage with its rigidly integrated linear axial bearings, slideably disposed on the novel rigidly fixed sli-de rails.
ya a 14.
Compact Sliding Compound Mitre haw, g F1G. 8 is the same as fig. ?, except the round tubelar slide rails of fig. ? have been substituted by either conventional channel sli-de rails, at the left, or by yet another alternative slide rail sys-tem, square bars and low friction plastic bearings with the saw car:-riage arranged to accomodate the required linearly travelling bear rings, four in number in these cases, ~'TG. g is the same as x'ig. ?, except the round tubelar slide rails of fig. 7 have been substituted by traditional "bar and rod" slide rails, the saw carriage provided with four horizontally disposed ball bearings, which have special outer races circumferentially groved to engage the rode on said slide rails, FIG. 10 is a cross section labelled ~-~ in fig. 6, showing a prefer-red alternative vertical rotatable~.w~.thin-limits support bearing means for the rotunda, thus eliminating the central vertical bear-ing means shown in fig. b. 'This means has the advantage of elimina-ting the clearance slot in the long axis of the saw carriage for the central vertical axis bearing means of the rotunda, greatly impro-ving the rigidity of said saw carriage.
Compact Sliding Compound mitre Saw. Wage 15.
DESCRIPTION OF THE PREFERRED EMBODIMENTS.
Referring first to ~'xt~~1, there is shown a transverse cross section of a representative e~abodiment of a first form of existing art, indicated by numeral 10. Sliding compound mitre saw 10 inclu-des a direct drive saw 11, a circular saw 12, an integrated rigid pivot arm 13, rigidly attached to direct drive saw 11, a pivot arm pivot 14, arranged parallel to the lateral axis of saw 12, a pivot arm pivot tower 15, at the first end, the tap end , supporting pi-vot arm pivot 14~, and arcing downward and backward , provided with a horizontal axis bevel pivot 16 at the second end, the bottom end. A screw clamping means 17 locks pivot arm pivot tower rigid-ly to bevel pivot boss 18, when tightened manually after adjusting the angle of saw l2 to the desired bevel for the cut of cut member 19, a two inch by fourteen inch piece of material, the maximum si-ze possible for this particular embodiment. bevel pivot boss 18 is rigidly attached to the backward ends of two tubelar slide rails 20 parallel arranged to each other and also parallel to the center-plane of saw 12, as well as parallel to the long axis of bevel pi-vot 16. laid long axis of bevel pivot 16 also lies on the center-plane of saw 12 as well as on the spacial extension of the support surface for the cut member 19, said support surface the top surface of rotunda 21, rotatably supported by vertical axis rotunda pivot 22, said vertical axis lying on the center of rotunda 21. '1'he rea--°
son for having the long axis of bevel pivot 16 located as described is to ensure that saw 12 always enters the same clearance slot pro-vided in the top surface of rotunda 21 regardless of bevel ad~ust-ment. Rotunda pivot 22 and additionally arranged radially, radial bearings 22 support rotunda 21 on main table 24 so that rotunda 21 Compact Sliding Compound r~i~tre :yaw. rage 16.
may rotate within limits relative to main table 24 to adjust for the desired mitre cut, after which adjustment rotunda 21 is locked solid to main table 2~ by rotunda lock 25. Spanning across the top surface of rotunda 21 is fence 26 comprising a vertical barrier a-gainst which the far side of cut member 19 is held firmly by the o-perator. Fence 26 comprises a left wing 27 and a right wing 28, to-tally separated to allow saw 12 clearance, but rigidly connected to-gether by horizontally disposed crescent shaped fence bridge 28A.
Fence 26 is rigidly ajctached at each of its ends to the left wing 29 and the right wing 30 of main table 24. 'i'he vertical axis of ro-tunda 22 lies on the centerplane of saw 12 and at the same time on the spacial extension of the working faces of fence 26 to ensure that saw 12 enters the same clearance slot in fence 26 regardless of which mitre angle is adjusted for. 'iubelar slide rails 20 are slideably disposed in two linear axial bearings 31, with their long axis parallel to the centerplane of saw 12, said axial bearings ri-gidly attached under the top surface of rotunda 21 at its far side.
Stops 32 at the ends of slide rails 20 ensure that said rails will not be allowed to exit axial bearings 37., while the forward face of bevel pivot boss 18 forms the forward travel limit for slide rails 20o A counterbalance spring means 33 is biassed to arc direct drive saw 11 against rest stop 34 while chap travel limit stop 35 ensures that saw 12 cannot enter the clearance slot in the top surface of rotunda 21 beyond a certain limit. The operator manipulates saw 12 by holding handle 36, rigidly attached to direct drive saw 11, for-cing handle 36 smoothly downward to the downward limit of saw 12 and thence backward towards the backward limit of the elide action tre vel provided by stops 32.
Compact Aiding compound nitre haw, fags 17.
Turning now to F1G. 2' there is shown a transverse crass section of a representative embodiment of a second form of ex-fisting art. The numerals and description for Fig. 1 apply equally to fig. 2, except as followa~
bevel pivot boss 1$ is rigidly attaohed to the backward face of rotunda 21, with the long axis of bevel pivot 16 again lying on the centerplane of saw 12 and the spacial extension of the top surface of rotunda 21, for the same reason as described for ~'ig. 1.
A novel bevel pivot tower 37 is provided with a bevel pivot flange 3$ to mate with bevel pivot boss 1$ and a pair of linear axial bea-rings 31 a~ tts backward end, with the long axis of said axial bea-rings 31 lying well above the long axis of bevel pivot 16, and para-llel to the centerplane of saw 12 and parallel to the top surface of rotunda 21. yivot arm pivot tower 1~ is decreased in size and atta-ches rigidly to the forward ends of elide rails 20, which are slide-ably disposed in axial bearings 31. moth at rest and during use the bevel pivot tower 3~ and part of slide rails 20 protrude from the 'back of sliding coMpound mitre saw 10, thus making far a larger en-velope site of the overall machine. All the rest of the description :for Fig. 1 applies.
'1'urnin,g now to FIG~ 3, there is shown a plan view of the embodiment of Fig. 2, intended to clarify the relationship be-tween the components making up a typical embodiment of the known ex-isting art. The numerals and description given for Fig. 2 apply.
'i'urning now to F1G~4, there is shown a vertical cross section , taken on the centerplane of saw 12, of a preferred embodi-ment of the invention. Aiding compound mitre saw 10 inoludes a di-rect drive saw 11, a circular saw 12, an integrated rigid pivot arm Compact Sliding compound P~litre :yaw. rage 18.
1'i, rigidly attached to direct drive saw 11, a pivot arm pivot 14, having a long axis parallel to the lateral axis of saw 12, a pivot arm pivot tower 15, which at its first end, the top end, supports pivot arm pivot 14, and arcing downward and backward, is provided with a horizontal axis bevel pivot 16 at its secorx~end, its bottom end. Said bevel pivot 16 in ttris case being a spigot anal flame ar-rangement concentric with A horizontal axis which lies on both the centerplane of saw 12 as well as lying on the special extension of the top surface of rotunda 21, thus functionally acting the same as a pivot pin. Conventionally the bevel pivot arrangement as shown shown in I''ig. 1 comprises a bevel pivot 16 in the form of a bolt and self locking nut. ~n order to rotate easily for purposes of be-vel adjustment, the nut of bevel pivot 16 is left loose, and after adjustment for the desired bevel, screw o'!ampin~; means 17 is firm-ly tightened thus taking up all clearance in the flat face joint between bevel pivot boss 18 and pivot arm pivot tower 15. The nut of bevel pivot 16 now no longer is in tight contact w~_th its con-tact surface in pivot arm tower 15, and thus the bolt and nut ma-king up bevel pivot 16 contribute nothing to the stiffness and ri-gidity of the face joint. i'he only rigidity is now provided by screw clamping: means 17 which comprises an extra large bolt in the case of this preferred embodiment, exploiting the extra robustness in the area under consideration provided by the backward end of saw carriage 39. mo avoid havin,~ the operator back off the clamping nut on screw clampin,~ means 17 too much, a self locking nut may be provided as shown, adjusted permanently to allow backing off of the clamping nut of screw clamping means 17 over one turn only. screw clamping means 17 operates in a semi-circular slotted opening to Compact Sliding Oompounc~ Nitre Saw. Page 19.
form a quadrant concentric with the horizontal axis of bevel pivot 16. Bevel pivot boss 1~ is integrated robustly in the backward end of saw carriage 39, comprising an elongated flattened body, with up-ward reaching bevel pivot boss 18 at one end, and two parallel dispo-sed linear axial bearings 31 on either side of said elonga-ted flattened body at its forward end. Saw carriage 39 protrudes up-ward through the backward side of rotunda 21, with the rest disposed underneath the top surface of rotunda 21 and within its confines.
Rigidly supported by rotunda 21 and within its confines are a pair of slide rails 20, arranged on either side of the horizontal back-to-front centerline of rorunda 21, and arranged parallel to the cen-terplane of saw 12 and also parallel to the top surface of rotunda 21, said slide rails 20 rigidly attached at both ends to the forward and backward extremities of rotunda 21 underneath its top surface.
Linear axial bearings 31 are slideably disposed on slide rails 20, with the linear travel of the saw carriage limited the exposed length of slide rails 20. The novel feature of the invention, fixed slide rails 20, supported underneath and directly by, and within the confines of, rotunda 21, and with linear axial bearings 31 slide-ably disposed on said slide rails also within the bottom confines of rotunda ~1 has these advantages: Zn the case of known existing art, as shown in fig's 1 and ~, the sl~.de rails 20 are cantilevered beams which for the same stiffness require twiCP the moment of inertia of simple beams supported at both ends, as is the case for the inven-tion. The invention thus allows much smaller slide rails 20. In the case of the known existing art, for the sane capacity of cut, the ho-rizontal distance between the center of gravity of direct drive 11 and the center of linear axial bearings 31, both changes as direct Compact Sliding Compound P~iitre Saw. Pale 20.
said drive 11 traverses, as well is much greater than distance for the in-vention, meaning that the stress in the case of the known existing az:~t in axial bearings 31 is greater than that in the case of the in-vention. this also means that any play or sloppiness of fit is ampli-fied more in-the known existing art than in this invention9 for the fit of slide rails 20 in axial bearings 31. mhe invention also is much more compact than the known existing art of Fib. 2, with no external protrusions while at rest, and both the slide rails 20 as well as axial bearings 31 are protected from accidental damage and most dust in the case of the invention, both elements being dispos-ed within the confines of rotunda 21. Since the saw carriage 39 ex-its from the backward extremity of rondo 21, thus requiring a sui-table opening in said backward extremity, rotunda stiffening flame 40 is provided, spanning across said opening. For the rest, the nu-merals and descriptions for Fig. 1 apply for this drawing.
Rotunda 21 comprises a generally hat-like structure, having a disc-like top surface, horizontally disposed, to form the support surface for the cut member 19, said top surface penetrated by a trough-like clearance channel 41 for the bottom edge of saw 12 in the bottommost cutting position, said clearance channel ~1 exten-ding beyond the circumferential extremity of rotunda 21 to accomoda-te the slide trajectory of saw 12 in the forward position. Rotunda 21 is approximately symmetrically disposed about the fore to aft di-rection of the trajectory of saw 12, and at its circumference is provided with skirt-like circumferential side wall 4~2, which in the preferred embodiment is prov3.ded with a planar bearing flange 43 on its bttommost edge, said planar bearing flame concentrically dis-Compact Sliding Compound Mitre Saw. Page 21.
posed with the said top surface of rotunda 21. The back extremity of rotunda 21 is provided with saw carriage clearance opening 44, while side wall 42 is penetrated by line bored holes for slide rails 20 in the fore and aft direction. Alternative to concentric planar bearing flange ~3 may be vertically disposed central pivot bearing 45, which, if used, requires a clearance slot 46 in saw carriage 39 to accomodate fore and aft travel of same. To assemble, rotunda 21 is held upside down and saw carrage 3g is maneuvered into position, having axial bearin,,~s 31 prefitted. Next slide rails 20 are insert-ed through their support holes and t3zrou~;h axial bearings 31, and locked in position with rollpine, Turning now to ~''IG~~, there is shown an end view of the assembled sliding compound mitre saw 10 from the aft direction labelled A-~ in Fib. ~. Shown is clearance opening 44~ for saw car-riage 39 in the back cireumferential side wall 42 of rotunda 21, and the end view of pivr~t arm pivot tower 15 and its bevel pivot 16 complete with screw clamping means 17 in its quadrant slot.
Turning now to CIO. 6, there is shown a bottom view of the invention, taken on the plane labelled $--B in Fip. ~. Rotunda 21 is rotatable within :Limits mounted in main table 2~. The rotata-ble within limits means may be either a centrally mounted rotunda pivot 22 turnable in central- pivot bearing 45. or preferably may be circumferentially mounted planar bearing flame 43, turnably within limits mounted in a closely matching bearing race machined in main table 2~, complete with retai.nin~ collars as shown in Fib. 10 in mo-re detAil. Latter concentric rotatin.~ provision has the great advan-tage of allowin.~t the elimination of clearance slot 44 in saw carria-~e 39. greatly simplifying and strengthening said carriage. Clearly Compact :~lidin.~ Compound Mitre Saw, Page 22.
shown is the forward location of linear axial bearing 31 in rela-tion to the vertical axle of rotation for rotunda 21 in the rest po-sition, in a fixed horizontal relationship to direct drive 11 and saw 12. Said fixed horizontal relationship is much smaller in size than that for the known existing art, meaning less "overhu~xi~" load-ink: of Linear axial bearings 31, and a smaller magnification of any play in said axial bearings, at the cut. Shown is the fixed moun-ting of slide rails 20 in through holes , line bored, in mounting bosses provided for that purpose on the inside of circumferential side wall 42 of rotunda 21. To make for as compact an arrangement as possible, an objective of the invention, bevel pivot boss 18 is arranged as far forward as possible, narrowly clearing rotunda stiffening flame 40, which in turn narrowly clears fence bridge 28A. In the ~5 degree mitre position, bevel pivot boss 18 still clears the backside of fence 26 adequatly, as shown by the phan-tom outline of said boss in said position. To have the sought for capacity of cutting a 14 inch wide cut member, the rotunda diame-tre of the invention is about 17 inches in diametre, as necessita-ted by adequatly long linear axial bearin~a 31. The mounting bos-ses for slide rails 20 located on the inside of circumferential si-de wall 42 of rotunda 21 serve as travel lim~.t stops for saw carri age 39, in both directions,.
Turning now to FIG. 7, there is shown a cross section turned to the horizontal position of saw carriage 39 at the locati-on of the outboard mounts for linear axial bearings 31, showing the3.r relationship to saw clearAnee channel 41 in the top surface of rotunda 21. Rotunda central pivot beaxing clearance slot 46 in saw carriage 39 will not be required in the preferred embodiment of :., ~,, compact Sliding Oompound Mitre haw. Page 23.
the invention, which uses concentrically machined planar bearing flame 4~3 as shown in Fib. 10. This view is labelled 0-0 in Fi~.6, Turning now to fIO's 8 and 9, there are shown cross sections identical to Fib. 7, except that the preferred tubelar slide rails 20 of Fib. ~ are substituted with conventional chan-nel slide rails, ~ left aide of. F~.~. 8, ~ or conventional square bar or square tube slide rails, ~ right side of Fi~~ 8,) or tradi-tional square bar and rod elide rails, ~ left side of Fi~o 9.) The left side views show the traditional uge of suitably made ball bearings as bearings, while the right aide of Fig. 8 shows low fric-tion plastic bearings as the sliding provision for saw carriage 39;
latter arrangement intended for economy versions of the invention , keeping in mind that too low a friction for the slide bearings can be dangerous when amateurs use the saw, since it tends to jump for-ward with great force toward the operator when the saw blade first contacts the material to be cut. These views are labelled ~-C in 1''~~. 6.
Turning now to Fl~. 10, there is shown a cross sec-tion turned to the horizontal position of the preferred vertical ax-is concentric rotatable-within-limits mountinae of rotunda 21 in main table 24o Circumferential side wall 42 of rotunda 21 is provi-ded with concentrically machined planar bearing flame 43, which is rotatably mounted in a match~.n~ plain bearing race in main table 24, while retained in position b,y crescent shaped retainers as shown.
This embodiment has the great advantage of eliminating central pi-vot bearing 45, thus avoidir~ the need for central pivot bearing clearancQ slot 46 in saw carriage 'i9. as shown in fig. 6. This view is labelled D--D in fiat. b p Compact eliding Compound Mitre Saw. fate 24.
It should be understood that rotunda 21 may be in-tegrated solidly in main table 24, eliminating the means of rota-tion for said rotunda, said rotation only serving the purpose of providing for the ability to make mitre eutso Said ability may readily be provided for by replacing fixed fence 26 with a fence which is ad~uetable far mitre cuts, latter fence simply having a vertical pivot means with a lox~,~ axis which lies on the centerpla-ne of saw 12, as well as lying on the special extension of the working face of said latter fence. paid latter fence is the subject of a separate patent appli.~ation by this inventor. All the advan-tages of the present invention apply to this simpler alternative embodiment of the invention. Again, also, in many applications pro-visions for bevel cute ie not required; accordingly, bevel pivot means including items 1b, 1? and 18 may be eliminated without af-fectin~ the advantages of the present invention.
~'rhile the invention has been disclosed by reference to specific preferrred embodiments, it should be understood that numerous changes could be made within the scope of the inventive concepts disclosed. Accordingly, the invention is not intended to be limited by the disclosure, but rather to have the full scope permitted by the language of the following claims.
'This invention relates to power tools intended to sever long mate-rials in two pieces for each cut, ~~ore particularly, the invention will have its primary use in woodworking.
Compact eliding Uompound Mitre haw. Yage 3.
BACKGRUU1~D OF THE 1NYEN'1'ION.
It is known in the art relating to woodworking that the smoothest cut is obtained when the cutting teeth o.f the circular saw blade exit the material at as small an angle as possible. wood fibres tend to tear out at the surface when the cutting teeth exit at lar-ge angles and this problem is unacceptable for accurate finishing work where appearance is paramount. 'lo overcome this problem, the sawbla de must enter the flat lying piece of material from above, and at the same time the circular blade Must be large enough to complete the cut without having the teeth exit the material at a large angle. At the same time the blade must be prevented from wob-bling due to lack of support or due to lack of rigidity in the ma-chine members controlling the Planar motion of the blade, as well as due to play in any supporting bearings controlling the planar motion of the blade. ffo accomodate these demands the existing "com-pound mitre saw".was created. '.~'he saw mechanism is a compact direct drive unit provided with a very rigid pivot arm, which is provided v~ri.th rugged and accurate pivot means at its far end, which in turn is rigidly mounted to the surface which supports the material to be cut. '1'o prevent the material from moving while being cut, a ri-gid "fence" is Provided, against which the material is held by the human operator; or the material may be clamped in place. 'lo allow bevel cuts, the pivot means, above, itself is provided with a bevel pivot means , the axial centerline of which lies on the centerplane of the saw blade, as well as lying on the special-extension of the supporting surface far the material to be cut. '1'his ensures that the saw blade enters the same slot in the supporting surface. 'fhe bevel pivot means is looked solid during a cut so that any play in 'Compact Sliding compound Mitre Saw.
Page ~.
its mechanism is cancelled out in an effort to maintain accuracy of the cut. To allow angle cute, known as "mitre" cuts in the ~~S.A.~
the supporting surface for the material to be sut consists normally in the form of a "rotunda", a rigid horizontal disc, rotatably moun-ted in a main table, and locked during a cut. 'The vertical axis of rotation for the rotunda lies approximately under the center of the saw blade to allow for the same capacity of the cut whether a right hand or left hand mitre cut is made. The above fence spans across the rotunda without contacting it, and is rigidly fastened to the main table at each end, where the main table protrudes sideways from the rotunda. While all the above accomodations to ensure "c'?eanliness" and accuracy of cut, so paramount in finishing work, have admirably been met in the existing art, the next most impor-tant asset of the art, compactness and light weight, did not go un-noticed to woodworkers engaged in other than finishing woodwork, where rough cuts due to fibre breakout are not objectionable. 'The problem was that previously existing units did not have enough cross cut capacity. '-~'o accomodate this new demand for greatly incre-ased cross cut capacity, the sliding compound mitre saw was created in two known forms. In one form, the rotunda is provided with two horizontal axial bearings, parallel to each other and parallel to the centerplane of the saw blade. Slideably disposed in said bear-ings are a pair of rigid steel tubes extending backwards and suppor-ting the normal conventional bevel pivot boas at the far ends mutu-ally. Said boss in'turn supports the conventional pivot arm pivot and thus the pivot arm and saw mechanism, with the pivot arm longer than those on non-sliding saws, to allow for a greater throat depth.
'Throat depth in the case of machines as described herein, is the Compact Sliding Compound Mitxe haw. fags 5.
distance from the edge of the material to be cut nearest to the hu-man operator, to the vertical obstruction composed by the bevel pi-vot boss and its upward extending pivot arm pivot tower. 'this full throat depth cannot be utilised because the bevel pivot boss and pi-vot arm pivot tower arc toward the human operator against the back-side of the fence when the rotunda is adjusted for a mitre or com-pound cut; it is also for this reason that the fence is located well forward of the bevel pivot bass. wince sliding action causes fibre breakout at the cut, the operator does not use it to cut finishing lumber; instead the saw is located above the material and simply brought down into the material as in conventional saws of this kind, with only the extra precaution required of holding the handle of the saw extra securely and firmly to prevent the saw from dumping for-ward towards the operator. Except for this extra precaution, and for the extra flexibility of the sliding tubes and any play in the axial bearings,, fir the sliding tubes, thus creating a greaterpotential for inaccuracy of the cut, the sliding compound mitre saw retains the primary advantage of the conventional compound mitre saw, namely the ability to bring the blade down into the material with less tendency for fibre breakout. In the second known form of the sliding compound mitre saw, the conventional location for the bevel pivot boss , that is directly mounted on the backside of the rotunda, is retained. 'l~hi8 boss is provided with a pair of mutually connected backward extending and slightly upward pointing arms, at the end of which a pair of parallel oriented axial beariz~,gs is provided; said bearings axially also parallel to the centerplane of the saw blade.
Disposed slideably in these bearings is a pair of slide tubes, at the near end of which a conventional pivot arm pivot is provided.
compact Aiding compound nitre haw. .gage b.
r'or the rest of a description, everything said above for the first form of a sliding compound mitre saw applies.
Compact :Aiding Oompound mitre haw. rage 7.
SU MNIARY OF THE 1?~TSIE','TT 102T .
'1'he present invention provides a sliding compound mitre saw having two primary advantages over the known existing art as described above, namely~ a pair of slide tubes is provided which do not extend backward from a ro'~unda, if a rotunda is used, thus providing for a more compact overall machine while in the rest position; and, sec-ondly, the axial bearings, disposed on said tubes, and allowing for the required sliding motion of the saw blades have a rigid relati-onship geometrically to the center of the saw blade, and by being located close to said center, are creating less bending moment, due to the weight of the saw mechanism and due to reaction forces acting on the saw blade while in use. Less bendingmoment on said bearings avoids stiction, allows smaller shorter bearings, and en-sures greater accuracy of the cut, with any play not magnified by an ever longer moment arm as is the case with the existing art in which the saw mechanism is displaced relative to the axial bearings.
'These and other features and advantages of the invention will be more fully understood from the following description of several preferred alternative embodiments taken together with the accompa-nying drawings.
Compact Sliding compound Nritre Saw. Page 8.
~3RTEF DESCRIPTION OF TH'E DRAWINGS.
The following definitions apply for the terms used in this disclo-sure. A "saw" is a ocular blade mounted an a rotating shaft, the "arbor", capable of severing, named the "cut", a piece of materi-al in two pieces, the whole piece being the "cut member". '1'he arbor has a gear at one end, which is driven by a pinion gear on the mo-tor; this arrangement is a "direct drive". Z'he cutting members on the circumference of the saw are the "teeth", but alternatively may be abrasives when cutting metals. '~-'he spatial extension in line with the centerplane of the saw is the "plane", or if descriptive of in-line motion of said plane, is "planar", vertical displacement of the plane is "chopping", while horizontal displacement in-line is "sliding". The housing supporting the arbor and enclosing the gears is the "gearbox". The horizontal surfaces defining a cut mem-ber are the "top" and "bottom" while the vertical surfaces are the "far" and "near" edges, with far and near relating to the location of the human operator. "Forward" motion means motion towards the human operator, and ''backward" motian means motion away from said operator.If a cut is square to all surfaces of the cut member, it is a "straight" cut. if square to the tog and bottom, but not to the edges, it is a "mitre" cutr If square to the edges, but not to the top and bottom, it is a "bevel" cut. If neither square to top and 'bottom nor the edges, it is a"compound"cut. '1'he motion of the saw is limited to circular and planar by machine members. Chop-p~ng motion is rigidly controlled by a "pivot arm", an approxima-tely horizontal longitudinal rigid machine member extending back wards from the gearbox, rigidly attached to same, and provided with a horizontal axis "pivot arm pivot", parallel to the arbor, at the compact Sliding compound PZitre Saw. rage 9.
far end. The arbor and saw travel through an arc about said pivot arm pivot during cutting and caused by the human operator. The pi-vor arm pivot is supported in the top of a vertical "pivot arm pi-vot tower.", which has a second pivot at the bottom end, said second pivot being the "bevel pivot" and having a longitudinal centerline which is parallel to the centerplane of the saws said l~gitudinal centerline or "aria" closely in line with, or in line with the sup-porting surface on the machine for the bottom of the cut member.
Said bevel pivot supported in and by a "bevel pivot boss" and rigs d 1y locked to said boss during a cut. The bevel pivot boss may be di:
rectly attached rigidly to the support surface for the cut member in a conventional machine, or, alternatively, may be rigidly atta a-ched to the far ends of a pair of "slide rails" controlling sliding motion of the saw, 1f used. ~y arranging the long axis of the bevel pivot to lie on both the centerplane of the saw as well as on the spatial extension of the support surface" the saw enters said sup..
port surface always in the same "slot" regardless of bevel adjust-went, making for a simpler usage of the machine. if above mentioned slide rails are deployed in the design of the machine, with the be-vel pivot boss rigidly attached to the far ends of said rails a first arrangement of existing art is arrived at. 2n this case the slide rails are axially slideably disposed in a pair of axial bea-rings, installed rigidly on the bottom of the suppirrt surface for the cut member. Alternatively, in a second arrangement of ex3.sting art, the bevel pivot boss is rigidly attao~.ed to the backward edge or near the backward edge, of the support surface for the cut mem-ber, as is the case with conventional arrangement of the art. howe-ver~ in this case, the bevel pivot boss is provided with a pair of Corlpact Sliding Compound r°litre Saw. ~;
.~a a 10 .
upward and backward extending arms, in the tap end of which are dis-posed a pair of axial bearings, with their long axis parallel to the centerplane of the saw. Supported within these axial bearings are a pair of parallel slide rails, slideably disposed. Rigidly at-tached to the forward end of said sliderails is a pivot arm pivot tower, which in form supports the pivot arm and gearbox in the con-ventional manner. In bath cases of the existing art of sliding com-pound mitre saws the pivot arm is longer than in the conventional arrangement, to create a deeper "throat depth", necessary to acco-modate the wider lumber far which these saws are intended. "Throat depth" is the horizontal distance between the near edge of the cut member and the vertical. obstruction created by the pivot arm tower.
hut this throat depth cannot be fully exploited 'because the conven-tional supporting surface for the cut member is a "rotunda", a flat horizontally disposed circular disc, provided with a i'rotating- wit-hin-limits" support means, having a vertical axis of rotation which lies close ~co the center of the saw. Since the pivot arm pivot tower arcs about the vertica7~ axis of rotation of the rotunfa, said tower moves forward when adjusting the rotunda for a maximum mitre cut, bringing said tower against the backside of a transversely arranged "fence", a barrier spanning across the rotunda and rigidly attached to the "main table", said fence lacau on within the "throat" of the machine thus limiting the useable portion of the throat depth. 'lhe fence has the dual function. of keeping the cut Member safely in pla-ce during cutting, as well as forming the reference surface for the degree of mite cut. The main table forms the base of the machine, rotatabl.y-within-limits aupportin.,g the rotunda, providing support for the locking means of the rotunda, and having laterally extending rage 11.
compact Sliding ~or~pound P'iitre :yaw.
swings" which have upper surfaces flush with the upper surface of the rotunda, providing additional support for the cut member. The "handle" is an attachment, rigidly mounted on the gearbox opposite the pivot arm, which the operator grips firmly to bring the saw down and through the cut. "counter. balance bias means" is a flexi-ble force means, constantly acting, of enough strength to keeep the saw mechanism sus-pended in the highest possible position allowed by "travel stops" on the pivot arm pivot, said travel stops limiting the upper and lower position of the saw, the lower position designed to provide for maximum overall cutting capacity of the saw. '1'he axis of rotation is the "long Axis'" . '~'he generic name for a complete saw of the kind described is a "sliding pivot arm saw", since all combine ne the motion of an arc provided by a pivot arm with the ability, if desired, to move the saw '~_inearly. The complete package of saw and its its drive is the "saw mount" . '~'he combines? ability of a mitre and a bevel cut makes the complete saw a "sliding pivot arm compound mitre saw"; if bevel cut ability is excluded, the saw is a "sliding pivot arm mitre saw". dust likes øhe long axis of the bevel pivot lies on both the centerplane of the saw as well. as on the spatial extension of the support gurface for the cut member, to ensure that the saw always enters the same clearance slot in the said support surface, regardless of bevel adjustment, so does the vertical axis of rotati-cm for the rotunda lie on the centerplane ref the saw as well as on i;he spatial extension of the working face of the vertical fence, to ensure that the saw always enters the same clearance slot in said working surface of the fence, regardless of mitre adjustment. laid clearance slot in the fence creates a left "wing" and a right wing compact :Aiding Uompound ~':itre :~s,w.
rage 12.
of the fence, said wings tied rigidly together by a horizontally ~.ying , crescent shaped, "~°ence bridge".
13R1EF DESURIPTI021 OF T~~E D.E~AWINGS , ( C ontinued . ~
1'IG.l is a simplified cross section, vertically taken, of the first y"orm of the existing art.
FIG. z is the same as above, of the second form of the existing art.
~~n both cases, the stroke of the sliding rail system has been incre-ased from known embodiments to accomodate the cutting of a 2 inch by ~_4~ inch size cut member, with drawings made to scale for better comes:.
parison purposes.
I'1G. 3 is a plan view of the embodiment of .~'ig. 2, to clarify the relationship between the components making up a typical embodiment of the known existing art.
compact Sliding ~%ompound nitre saw. rage 13.
FIG. a is a vertical cross section , taken on the centerplane of the saw , showing the vain novel feature of the invention, namely two slide rails rigidly supported at both ends underneath and by the rotunda, having slideable axial bearings disposed on said ri-gidly fixed slide rails, said bearings rigidly joined together by to saw carriage composed of a downward and forward extending rigid extension of the bevel pivot boss, which protrudes upward and for-ward through the rotunda.
I'1G. 5 is a view labelled ~ in I'ig. ~+, showing the end supports of the slide rails in the backward extremity of the rotunda, with also the clearance opening in the backward extremity of the rotun-da shown as required by the novel .,9aw carriage , as it travels backward during use of the saw.
FIG. 6 is an upward view labelled ~-~ in Fig. 5, showing the total-ly hidden and thin well protected novel fixed slide rails and slide-ably disposed saw carriage, provided with a clearance slot, if desi-red, for a vertical axis central pivot for the rotunda. The novel saw carriage, by virtue of its inherent rigidity, also allows the bevel pivot boss to become robustly integrated into said carriage, with the clamping force between the pivot arm pivot tower and the bevel pivot boss concentrated in a robust area close to the axial sliding bearings of the saw carriage.
FIG. 7 is a cross section labelled G-~ in fig. 6, rotated to the horizontal position, showing the relation between the clearance slot in the supporting surface of the rotunda for the cut member, and the novel saw carriage with its rigidly integrated linear axial bearings, slideably disposed on the novel rigidly fixed sli-de rails.
ya a 14.
Compact Sliding Compound Mitre haw, g F1G. 8 is the same as fig. ?, except the round tubelar slide rails of fig. ? have been substituted by either conventional channel sli-de rails, at the left, or by yet another alternative slide rail sys-tem, square bars and low friction plastic bearings with the saw car:-riage arranged to accomodate the required linearly travelling bear rings, four in number in these cases, ~'TG. g is the same as x'ig. ?, except the round tubelar slide rails of fig. 7 have been substituted by traditional "bar and rod" slide rails, the saw carriage provided with four horizontally disposed ball bearings, which have special outer races circumferentially groved to engage the rode on said slide rails, FIG. 10 is a cross section labelled ~-~ in fig. 6, showing a prefer-red alternative vertical rotatable~.w~.thin-limits support bearing means for the rotunda, thus eliminating the central vertical bear-ing means shown in fig. b. 'This means has the advantage of elimina-ting the clearance slot in the long axis of the saw carriage for the central vertical axis bearing means of the rotunda, greatly impro-ving the rigidity of said saw carriage.
Compact Sliding Compound mitre Saw. Wage 15.
DESCRIPTION OF THE PREFERRED EMBODIMENTS.
Referring first to ~'xt~~1, there is shown a transverse cross section of a representative e~abodiment of a first form of existing art, indicated by numeral 10. Sliding compound mitre saw 10 inclu-des a direct drive saw 11, a circular saw 12, an integrated rigid pivot arm 13, rigidly attached to direct drive saw 11, a pivot arm pivot 14, arranged parallel to the lateral axis of saw 12, a pivot arm pivot tower 15, at the first end, the tap end , supporting pi-vot arm pivot 14~, and arcing downward and backward , provided with a horizontal axis bevel pivot 16 at the second end, the bottom end. A screw clamping means 17 locks pivot arm pivot tower rigid-ly to bevel pivot boss 18, when tightened manually after adjusting the angle of saw l2 to the desired bevel for the cut of cut member 19, a two inch by fourteen inch piece of material, the maximum si-ze possible for this particular embodiment. bevel pivot boss 18 is rigidly attached to the backward ends of two tubelar slide rails 20 parallel arranged to each other and also parallel to the center-plane of saw 12, as well as parallel to the long axis of bevel pi-vot 16. laid long axis of bevel pivot 16 also lies on the center-plane of saw 12 as well as on the spacial extension of the support surface for the cut member 19, said support surface the top surface of rotunda 21, rotatably supported by vertical axis rotunda pivot 22, said vertical axis lying on the center of rotunda 21. '1'he rea--°
son for having the long axis of bevel pivot 16 located as described is to ensure that saw 12 always enters the same clearance slot pro-vided in the top surface of rotunda 21 regardless of bevel ad~ust-ment. Rotunda pivot 22 and additionally arranged radially, radial bearings 22 support rotunda 21 on main table 24 so that rotunda 21 Compact Sliding Compound r~i~tre :yaw. rage 16.
may rotate within limits relative to main table 24 to adjust for the desired mitre cut, after which adjustment rotunda 21 is locked solid to main table 2~ by rotunda lock 25. Spanning across the top surface of rotunda 21 is fence 26 comprising a vertical barrier a-gainst which the far side of cut member 19 is held firmly by the o-perator. Fence 26 comprises a left wing 27 and a right wing 28, to-tally separated to allow saw 12 clearance, but rigidly connected to-gether by horizontally disposed crescent shaped fence bridge 28A.
Fence 26 is rigidly ajctached at each of its ends to the left wing 29 and the right wing 30 of main table 24. 'i'he vertical axis of ro-tunda 22 lies on the centerplane of saw 12 and at the same time on the spacial extension of the working faces of fence 26 to ensure that saw 12 enters the same clearance slot in fence 26 regardless of which mitre angle is adjusted for. 'iubelar slide rails 20 are slideably disposed in two linear axial bearings 31, with their long axis parallel to the centerplane of saw 12, said axial bearings ri-gidly attached under the top surface of rotunda 21 at its far side.
Stops 32 at the ends of slide rails 20 ensure that said rails will not be allowed to exit axial bearings 37., while the forward face of bevel pivot boss 18 forms the forward travel limit for slide rails 20o A counterbalance spring means 33 is biassed to arc direct drive saw 11 against rest stop 34 while chap travel limit stop 35 ensures that saw 12 cannot enter the clearance slot in the top surface of rotunda 21 beyond a certain limit. The operator manipulates saw 12 by holding handle 36, rigidly attached to direct drive saw 11, for-cing handle 36 smoothly downward to the downward limit of saw 12 and thence backward towards the backward limit of the elide action tre vel provided by stops 32.
Compact Aiding compound nitre haw, fags 17.
Turning now to F1G. 2' there is shown a transverse crass section of a representative embodiment of a second form of ex-fisting art. The numerals and description for Fig. 1 apply equally to fig. 2, except as followa~
bevel pivot boss 1$ is rigidly attaohed to the backward face of rotunda 21, with the long axis of bevel pivot 16 again lying on the centerplane of saw 12 and the spacial extension of the top surface of rotunda 21, for the same reason as described for ~'ig. 1.
A novel bevel pivot tower 37 is provided with a bevel pivot flange 3$ to mate with bevel pivot boss 1$ and a pair of linear axial bea-rings 31 a~ tts backward end, with the long axis of said axial bea-rings 31 lying well above the long axis of bevel pivot 16, and para-llel to the centerplane of saw 12 and parallel to the top surface of rotunda 21. yivot arm pivot tower 1~ is decreased in size and atta-ches rigidly to the forward ends of elide rails 20, which are slide-ably disposed in axial bearings 31. moth at rest and during use the bevel pivot tower 3~ and part of slide rails 20 protrude from the 'back of sliding coMpound mitre saw 10, thus making far a larger en-velope site of the overall machine. All the rest of the description :for Fig. 1 applies.
'1'urnin,g now to FIG~ 3, there is shown a plan view of the embodiment of Fig. 2, intended to clarify the relationship be-tween the components making up a typical embodiment of the known ex-isting art. The numerals and description given for Fig. 2 apply.
'i'urning now to F1G~4, there is shown a vertical cross section , taken on the centerplane of saw 12, of a preferred embodi-ment of the invention. Aiding compound mitre saw 10 inoludes a di-rect drive saw 11, a circular saw 12, an integrated rigid pivot arm Compact Sliding compound P~litre :yaw. rage 18.
1'i, rigidly attached to direct drive saw 11, a pivot arm pivot 14, having a long axis parallel to the lateral axis of saw 12, a pivot arm pivot tower 15, which at its first end, the top end, supports pivot arm pivot 14, and arcing downward and backward, is provided with a horizontal axis bevel pivot 16 at its secorx~end, its bottom end. Said bevel pivot 16 in ttris case being a spigot anal flame ar-rangement concentric with A horizontal axis which lies on both the centerplane of saw 12 as well as lying on the special extension of the top surface of rotunda 21, thus functionally acting the same as a pivot pin. Conventionally the bevel pivot arrangement as shown shown in I''ig. 1 comprises a bevel pivot 16 in the form of a bolt and self locking nut. ~n order to rotate easily for purposes of be-vel adjustment, the nut of bevel pivot 16 is left loose, and after adjustment for the desired bevel, screw o'!ampin~; means 17 is firm-ly tightened thus taking up all clearance in the flat face joint between bevel pivot boss 18 and pivot arm pivot tower 15. The nut of bevel pivot 16 now no longer is in tight contact w~_th its con-tact surface in pivot arm tower 15, and thus the bolt and nut ma-king up bevel pivot 16 contribute nothing to the stiffness and ri-gidity of the face joint. i'he only rigidity is now provided by screw clamping: means 17 which comprises an extra large bolt in the case of this preferred embodiment, exploiting the extra robustness in the area under consideration provided by the backward end of saw carriage 39. mo avoid havin,~ the operator back off the clamping nut on screw clampin,~ means 17 too much, a self locking nut may be provided as shown, adjusted permanently to allow backing off of the clamping nut of screw clamping means 17 over one turn only. screw clamping means 17 operates in a semi-circular slotted opening to Compact Sliding Oompounc~ Nitre Saw. Page 19.
form a quadrant concentric with the horizontal axis of bevel pivot 16. Bevel pivot boss 1~ is integrated robustly in the backward end of saw carriage 39, comprising an elongated flattened body, with up-ward reaching bevel pivot boss 18 at one end, and two parallel dispo-sed linear axial bearings 31 on either side of said elonga-ted flattened body at its forward end. Saw carriage 39 protrudes up-ward through the backward side of rotunda 21, with the rest disposed underneath the top surface of rotunda 21 and within its confines.
Rigidly supported by rotunda 21 and within its confines are a pair of slide rails 20, arranged on either side of the horizontal back-to-front centerline of rorunda 21, and arranged parallel to the cen-terplane of saw 12 and also parallel to the top surface of rotunda 21, said slide rails 20 rigidly attached at both ends to the forward and backward extremities of rotunda 21 underneath its top surface.
Linear axial bearings 31 are slideably disposed on slide rails 20, with the linear travel of the saw carriage limited the exposed length of slide rails 20. The novel feature of the invention, fixed slide rails 20, supported underneath and directly by, and within the confines of, rotunda 21, and with linear axial bearings 31 slide-ably disposed on said slide rails also within the bottom confines of rotunda ~1 has these advantages: Zn the case of known existing art, as shown in fig's 1 and ~, the sl~.de rails 20 are cantilevered beams which for the same stiffness require twiCP the moment of inertia of simple beams supported at both ends, as is the case for the inven-tion. The invention thus allows much smaller slide rails 20. In the case of the known existing art, for the sane capacity of cut, the ho-rizontal distance between the center of gravity of direct drive 11 and the center of linear axial bearings 31, both changes as direct Compact Sliding Compound P~iitre Saw. Pale 20.
said drive 11 traverses, as well is much greater than distance for the in-vention, meaning that the stress in the case of the known existing az:~t in axial bearings 31 is greater than that in the case of the in-vention. this also means that any play or sloppiness of fit is ampli-fied more in-the known existing art than in this invention9 for the fit of slide rails 20 in axial bearings 31. mhe invention also is much more compact than the known existing art of Fib. 2, with no external protrusions while at rest, and both the slide rails 20 as well as axial bearings 31 are protected from accidental damage and most dust in the case of the invention, both elements being dispos-ed within the confines of rotunda 21. Since the saw carriage 39 ex-its from the backward extremity of rondo 21, thus requiring a sui-table opening in said backward extremity, rotunda stiffening flame 40 is provided, spanning across said opening. For the rest, the nu-merals and descriptions for Fig. 1 apply for this drawing.
Rotunda 21 comprises a generally hat-like structure, having a disc-like top surface, horizontally disposed, to form the support surface for the cut member 19, said top surface penetrated by a trough-like clearance channel 41 for the bottom edge of saw 12 in the bottommost cutting position, said clearance channel ~1 exten-ding beyond the circumferential extremity of rotunda 21 to accomoda-te the slide trajectory of saw 12 in the forward position. Rotunda 21 is approximately symmetrically disposed about the fore to aft di-rection of the trajectory of saw 12, and at its circumference is provided with skirt-like circumferential side wall 4~2, which in the preferred embodiment is prov3.ded with a planar bearing flange 43 on its bttommost edge, said planar bearing flame concentrically dis-Compact Sliding Compound Mitre Saw. Page 21.
posed with the said top surface of rotunda 21. The back extremity of rotunda 21 is provided with saw carriage clearance opening 44, while side wall 42 is penetrated by line bored holes for slide rails 20 in the fore and aft direction. Alternative to concentric planar bearing flange ~3 may be vertically disposed central pivot bearing 45, which, if used, requires a clearance slot 46 in saw carriage 39 to accomodate fore and aft travel of same. To assemble, rotunda 21 is held upside down and saw carrage 3g is maneuvered into position, having axial bearin,,~s 31 prefitted. Next slide rails 20 are insert-ed through their support holes and t3zrou~;h axial bearings 31, and locked in position with rollpine, Turning now to ~''IG~~, there is shown an end view of the assembled sliding compound mitre saw 10 from the aft direction labelled A-~ in Fib. ~. Shown is clearance opening 44~ for saw car-riage 39 in the back cireumferential side wall 42 of rotunda 21, and the end view of pivr~t arm pivot tower 15 and its bevel pivot 16 complete with screw clamping means 17 in its quadrant slot.
Turning now to CIO. 6, there is shown a bottom view of the invention, taken on the plane labelled $--B in Fip. ~. Rotunda 21 is rotatable within :Limits mounted in main table 2~. The rotata-ble within limits means may be either a centrally mounted rotunda pivot 22 turnable in central- pivot bearing 45. or preferably may be circumferentially mounted planar bearing flame 43, turnably within limits mounted in a closely matching bearing race machined in main table 2~, complete with retai.nin~ collars as shown in Fib. 10 in mo-re detAil. Latter concentric rotatin.~ provision has the great advan-tage of allowin.~t the elimination of clearance slot 44 in saw carria-~e 39. greatly simplifying and strengthening said carriage. Clearly Compact :~lidin.~ Compound Mitre Saw, Page 22.
shown is the forward location of linear axial bearing 31 in rela-tion to the vertical axle of rotation for rotunda 21 in the rest po-sition, in a fixed horizontal relationship to direct drive 11 and saw 12. Said fixed horizontal relationship is much smaller in size than that for the known existing art, meaning less "overhu~xi~" load-ink: of Linear axial bearings 31, and a smaller magnification of any play in said axial bearings, at the cut. Shown is the fixed moun-ting of slide rails 20 in through holes , line bored, in mounting bosses provided for that purpose on the inside of circumferential side wall 42 of rotunda 21. To make for as compact an arrangement as possible, an objective of the invention, bevel pivot boss 18 is arranged as far forward as possible, narrowly clearing rotunda stiffening flame 40, which in turn narrowly clears fence bridge 28A. In the ~5 degree mitre position, bevel pivot boss 18 still clears the backside of fence 26 adequatly, as shown by the phan-tom outline of said boss in said position. To have the sought for capacity of cutting a 14 inch wide cut member, the rotunda diame-tre of the invention is about 17 inches in diametre, as necessita-ted by adequatly long linear axial bearin~a 31. The mounting bos-ses for slide rails 20 located on the inside of circumferential si-de wall 42 of rotunda 21 serve as travel lim~.t stops for saw carri age 39, in both directions,.
Turning now to FIG. 7, there is shown a cross section turned to the horizontal position of saw carriage 39 at the locati-on of the outboard mounts for linear axial bearings 31, showing the3.r relationship to saw clearAnee channel 41 in the top surface of rotunda 21. Rotunda central pivot beaxing clearance slot 46 in saw carriage 39 will not be required in the preferred embodiment of :., ~,, compact Sliding Oompound Mitre haw. Page 23.
the invention, which uses concentrically machined planar bearing flame 4~3 as shown in Fib. 10. This view is labelled 0-0 in Fi~.6, Turning now to fIO's 8 and 9, there are shown cross sections identical to Fib. 7, except that the preferred tubelar slide rails 20 of Fib. ~ are substituted with conventional chan-nel slide rails, ~ left aide of. F~.~. 8, ~ or conventional square bar or square tube slide rails, ~ right side of Fi~~ 8,) or tradi-tional square bar and rod elide rails, ~ left side of Fi~o 9.) The left side views show the traditional uge of suitably made ball bearings as bearings, while the right aide of Fig. 8 shows low fric-tion plastic bearings as the sliding provision for saw carriage 39;
latter arrangement intended for economy versions of the invention , keeping in mind that too low a friction for the slide bearings can be dangerous when amateurs use the saw, since it tends to jump for-ward with great force toward the operator when the saw blade first contacts the material to be cut. These views are labelled ~-C in 1''~~. 6.
Turning now to Fl~. 10, there is shown a cross sec-tion turned to the horizontal position of the preferred vertical ax-is concentric rotatable-within-limits mountinae of rotunda 21 in main table 24o Circumferential side wall 42 of rotunda 21 is provi-ded with concentrically machined planar bearing flame 43, which is rotatably mounted in a match~.n~ plain bearing race in main table 24, while retained in position b,y crescent shaped retainers as shown.
This embodiment has the great advantage of eliminating central pi-vot bearing 45, thus avoidir~ the need for central pivot bearing clearancQ slot 46 in saw carriage 'i9. as shown in fig. 6. This view is labelled D--D in fiat. b p Compact eliding Compound Mitre Saw. fate 24.
It should be understood that rotunda 21 may be in-tegrated solidly in main table 24, eliminating the means of rota-tion for said rotunda, said rotation only serving the purpose of providing for the ability to make mitre eutso Said ability may readily be provided for by replacing fixed fence 26 with a fence which is ad~uetable far mitre cuts, latter fence simply having a vertical pivot means with a lox~,~ axis which lies on the centerpla-ne of saw 12, as well as lying on the special extension of the working face of said latter fence. paid latter fence is the subject of a separate patent appli.~ation by this inventor. All the advan-tages of the present invention apply to this simpler alternative embodiment of the invention. Again, also, in many applications pro-visions for bevel cute ie not required; accordingly, bevel pivot means including items 1b, 1? and 18 may be eliminated without af-fectin~ the advantages of the present invention.
~'rhile the invention has been disclosed by reference to specific preferrred embodiments, it should be understood that numerous changes could be made within the scope of the inventive concepts disclosed. Accordingly, the invention is not intended to be limited by the disclosure, but rather to have the full scope permitted by the language of the following claims.
Claims (7)
1. A sliding pivot arm saw, including fixed slide rails, comprising in combination a main table definining a base for mounting the saw, a pair of slide rails, rigidly mounted in said table at both ends of said slide rails, said rails arranged in parallel and under and parallel to the working surface of said main table, and ha-ving aft end and forward end, a set of slide rail bearings sliceable disposed on said slide rails, a saw carriage, defining an elongated rigid means disposed between said slide rails, said carriage having a cantilevered aft end and having means for mounting said slice rail bearings on the forward end by way of outboard mounts, allowing said carriage linear travel only parallel to said slide rails, a pivot arm tower, defining an elongated rigid means, at the bot-tom end rigidly attached to said cantilevered aft end of said saw carriage, and provided at the top end with a pivot arm pi-vot means having an axis of rotation parallel to the working surface of said main table and square with the long axis of said slide rails, a pivot arm, defining an elongated rigid means having an aft and forward end, pivotably engaging said pivot arm pivot means at the aft end and allowing said arm to arc within limits in a plane which is parallel to said slide rails, a saw arbor, defining a shaft rotatably mounted on the forward end of said pivot arm on an axis of rotation parallel to said pivot Page 26.
arm pivot means, a circular saw, mounted on said arbor, a drive means to rotate said circular saw, a fence defining a barrier disposed on the working surface of said main table to retain material to be cut by said circular saw, a handle defining a handgrip rigidly attached to the forward end of said pivot arm to glide the saw and to move said saw carria-ge linearly, whereby a sliding pivot arm saw is provided for which the slide rails are rigidly mounted at both ends and out of harm's way below the working surface of the saw and wherein the slide rail bearings have a fixed relationship to the pivot for the pivot arm avoiding differences in accuracy for the planar disposition of the saw as the saw completes its trajectory to complete a cut.
arm pivot means, a circular saw, mounted on said arbor, a drive means to rotate said circular saw, a fence defining a barrier disposed on the working surface of said main table to retain material to be cut by said circular saw, a handle defining a handgrip rigidly attached to the forward end of said pivot arm to glide the saw and to move said saw carria-ge linearly, whereby a sliding pivot arm saw is provided for which the slide rails are rigidly mounted at both ends and out of harm's way below the working surface of the saw and wherein the slide rail bearings have a fixed relationship to the pivot for the pivot arm avoiding differences in accuracy for the planar disposition of the saw as the saw completes its trajectory to complete a cut.
2. A slicing pivot arm saw in accordance with claim 1 wherein said fence comprises a pivotable fence defing a fence having a pivot ro-tatable on an axis square to the working surface of said main table and on the plane of the centerplane of said saw, whereby a sliding pivot arm mitre saw is provided.
3. A sliding pivot arm mitre saw in accordance with claim 2, wherein said saw carriage cantilevered aft end is provided with a bevel pi-vot means, and wherein said pivot arm tower is separate and is ro-tatably mounted at the bottom end on said bevel pivot means allow-ing said pivot arm tower to rotate in a limited arc on a plane which is square to the long axis of said slide rails on an axis of rotation which is in line with the centerplane of said circular saw and in line with the working surface of said main tables, said bevel pivot means including a clamping means for locking said pivot Page 27.
arm tower rigid to said main table as desired.
whereby a sliding pivot arm compound mitre saw is provided.
arm tower rigid to said main table as desired.
whereby a sliding pivot arm compound mitre saw is provided.
4. A sliding pivot arm mitre saw, including fixed slide rails, compri-sing in combination a base for mounting the saw, a rotunda, defining a flat top circular table, mounted to rotate within limits in said base and lockable to said base, a pair of slide rails, rigidly mounted at both ends in said rotun-da, said rails arranged in parallel and under and parallel to said flat top of the rotunda, one rail on each side of the axis of rotation of the rotunda, a set of slide rail bearings, slideably disposed on said slide rails, a saw carriage, defining an elongated rigid means disposed between said slide rails, said carriage having a cantilevered aft end and mounts for said slide rail bearings along both sides on the forward end, allowing linear travel for said carriage only while guided and supported by said slide rails, a pivot arm tower, defining an elongated rigid means, at the bottom end rigidly attached to said cantilevered aft end of said saw carriage, and provided at the top end with a pivot arm pivot means having an axis of rotation parallel to said flat top of the rotunda, and square with the long axis of said slide rails, a pivot arm defining a rigid arm having an aft and a forward end, and pivotably engaging said pivot arm pivot means at the aft end to allow said arm to arc within limits in a plane which is paral-lel to said slide rails, a saw arbor, defining a shaft rotatably mounted on the forward end Page 28.
of said pivot arm on an axis of rotation parallel to said pivot arm pivot means, a circular saw, mounted on said saw arbor, on a plane passing through the axis of rotation of said rotunda, a drive means, to rotate said circular saw, a fence, defining an elongated barrier disposed across the center of said rotunda and rigidly attached at its ends to said base, to retain material to be cut, a handle, defining a handgrip rigidly attached to the forward end of said pivot arm to guide the saw and move said saw carriage linearly, whereby a sliding pivot arm mitre saw is provided for which the slide rails are rigidly attached at both ends by and within the confines of said rotunda and out of harm's way and wherein the slide rail bearings have a fixed relationship to the pivot for the pivot arm avoiding differences in accuracy for the planar dis-position of the saw as the saw completes its trajectory to comple-te a cut.
of said pivot arm on an axis of rotation parallel to said pivot arm pivot means, a circular saw, mounted on said saw arbor, on a plane passing through the axis of rotation of said rotunda, a drive means, to rotate said circular saw, a fence, defining an elongated barrier disposed across the center of said rotunda and rigidly attached at its ends to said base, to retain material to be cut, a handle, defining a handgrip rigidly attached to the forward end of said pivot arm to guide the saw and move said saw carriage linearly, whereby a sliding pivot arm mitre saw is provided for which the slide rails are rigidly attached at both ends by and within the confines of said rotunda and out of harm's way and wherein the slide rail bearings have a fixed relationship to the pivot for the pivot arm avoiding differences in accuracy for the planar dis-position of the saw as the saw completes its trajectory to comple-te a cut.
5. A sliding pivot arm mitre saw in accordance with claim 4 wherein said pivot arm tower is pivotably attached to said cantilevered aft end of said saw carriage allowing said pivot arm tower to ro-tate within limits in an arc which is square to said slide rails and having an axis of rotation in line with the centerplane of said circular saw and in line with said flat top of said rotunda and including a means to lock said tower rigid to said rotunda, whereby a sliding pivot arm compound mitre saw is provided.
6. A sliding pivot arm mitre saw in accordance with claim 4 wherein Page 29.
said rotunda is rotatably mounted in said base by means of a par-tially circumferential planar flange bearing defining in combina-tion an outward facing planar flange arranged concentrically with the axis of rotation for said rotunda on the bottom edge of the ro-tunda, a concentrically arranged planar seat in said base to rota-tably engage said planar flange, and retaining means to retain said flange in said seat, whereby a sliding pivot arm mitre saw is provided in which the inte-rior confines of the rotunda are clear of obstructions to interfere with said saw carriage allowing said carriage to be made simpler and stronger.
said rotunda is rotatably mounted in said base by means of a par-tially circumferential planar flange bearing defining in combina-tion an outward facing planar flange arranged concentrically with the axis of rotation for said rotunda on the bottom edge of the ro-tunda, a concentrically arranged planar seat in said base to rota-tably engage said planar flange, and retaining means to retain said flange in said seat, whereby a sliding pivot arm mitre saw is provided in which the inte-rior confines of the rotunda are clear of obstructions to interfere with said saw carriage allowing said carriage to be made simpler and stronger.
7. A sliding pivot arm compound mitre saw in accordance with claim 5 wherein said rotunda is rotatably mounted in said base by means of a partially circumferential planar flange bearing defining in combi-nation an outward facing planar flange arranged concentrically with the axis of rotation for said rotunda on the bottom edge of said ro-tunda, a concentrically arranged planar seat in said base to rotata-bly engage said planar flange, and retaining means to retain said flange in said seat, whereby a sliding pivot arm compound mitre saw is provided in which the interior confines of the rotunda are clear of obstructions to interfere with said saw carriage allowing said carriage to be made simpler and stronger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2372484 CA2372484A1 (en) | 2002-02-19 | 2002-02-19 | Compact sliding compound mitre saw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2372484 CA2372484A1 (en) | 2002-02-19 | 2002-02-19 | Compact sliding compound mitre saw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2372484A1 true CA2372484A1 (en) | 2003-08-19 |
Family
ID=27792737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2372484 Abandoned CA2372484A1 (en) | 2002-02-19 | 2002-02-19 | Compact sliding compound mitre saw |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2372484A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1690622A3 (en) * | 2005-02-15 | 2006-10-11 | GMCA PTY Ltd | Powered saw apparatus |
| CN111093920A (en) * | 2017-09-21 | 2020-05-01 | 豪迈面板分割科技有限公司 | Method for dividing a preferably plate-shaped workpiece |
| EP3983160A4 (en) * | 2019-06-21 | 2024-01-17 | Milwaukee Electric Tool Corp | Miter saw |
-
2002
- 2002-02-19 CA CA 2372484 patent/CA2372484A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1690622A3 (en) * | 2005-02-15 | 2006-10-11 | GMCA PTY Ltd | Powered saw apparatus |
| CN111093920A (en) * | 2017-09-21 | 2020-05-01 | 豪迈面板分割科技有限公司 | Method for dividing a preferably plate-shaped workpiece |
| CN111093920B (en) * | 2017-09-21 | 2022-03-29 | 豪迈面板分割科技有限公司 | Method for dividing a preferably plate-shaped workpiece |
| EP3983160A4 (en) * | 2019-06-21 | 2024-01-17 | Milwaukee Electric Tool Corp | Miter saw |
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