US1504865A - Scroll-sanding machine - Google Patents

Description

E. F. BUTTS SCROLL SANDING MACHINE Filed dan. 25,/ .1925 g shgetsrsheer l INVENTOR E. F. [BUTTS s cRoLL SANDING MACHINE 2 Sheets-Sheet 2 I l `|NVENTOR Filed dan. 25

Patented Aug. 12, 1924.

UNITED: STATES@ seRoLn-'SANDING y-iviAcfHINn-f Applicatoniled January 25,1 1923;: Serial Nd. A614,888:

` Be itiknown that I, EMIUF; BUT'rs51a citi-` zenru of fthe Anited States,` and a resident -of Tacoma,` r in i the county of rPierce, rState 'of Washington, have Iinvented certain new vand usefulv Improvements r in Scroll-Sanding Machines, .of which :the followings-isla speci-V fcation.

This inventiorrrelates to niracliinesfused :in theVI -xnanufacturef of'l frn'iture, and kindred industries;y for the purpose of r f smoothing tli'evrough. surfdcei of'.` ciirved' and other spie,- cially shaped or moldec'l wood'enfv pieces after they-have b'een'fbronghttothe ldesiredzrough shape and #sizefA in the". other machinery.il

The obj ects .of the'finvention are toprovide a `machine".- which` willbrace'th'epi-ece-of wood.;V while'k it rv isbeing: manipulate'dfv to sl'no'oth' its:.varyingisurfaces'j to '.=i1rs1i^reftliat thesrnoothed surface isnislred at 'the corq rectA anglewith!the-"adjacent" surface; 1 to permit the part' 1 beiirgiesniootlied to @be swng into any position Aorder 'to lering` tlrevsnlr faceV into contact l with theA sanding? belt; toY perinit'ltlreZ-belt' toibe b'ent `inrorder to smooth specialk shapesgff which will 1greatly increase? the lspeed atwhichf this workfinay bedone; which -isfsiinplefto operate Y I attain' -tliese and? other* objectsfbylthe "devices nechanisrnsfand arrangements iillustrated n 'the Vaecompanyin'zg@. drawings; vin which@ Fig; 1 'isai? side elevation of my\ miachine,` 'showing the outline Lof' apart ofthe 'top 'railfof a' chair' back'f being "s1noothed thereby; Fig.= v2 is 'a ifronti.y elevation `thereof showing the work brace board in vertical position and; in'ldotted lines, in tippedposition to change the angle between'its'surfac'e an'd the" plane of'l the sandingI belt Fig. 3 is a plan thereof*;'jFig.L LLisa sectionlof'apart thereof', on tlde line 4'-'4 in Fig3, vand Fig.

` 5 is a side elevation'ofthecomplete machine. Similar ndm'eralsv of reference-i" refer to similar parts throughout-the severalI views. This invention'fre'lates" to that class of smoothing machinesfwhicli use a traveling sand belt and isa specialforrh of'sanding table:

The base table `1jis suitably'l supported which are cut in its vfrontlan'd -rear edges respectively. These notchesmay preferably loeniade withslantingendsd and 5, respec- "tively, as shown inFigsi-l and 3-and'are 9 to the' desired posit-ion., The vwork table' 9 `70 iswsecured lto the said vblocks 16 by, means-lof two bolts *10, whose heads are:- niounted l'in tl1e--cou1itersunkf slots 11 in the rupper`vsurfaces;Y of lthe two 4blocks',y said: slotsl :11. -eX1- tendin gfronifro'nt tofrearfof saidblo'cks 6'.

Thewnuts 12' off the bolts'jlO are countersunk into the topliof thefw'ork'talcle '9"'s`o as not-itc interfere with the :sand :belt passi-ngfthereon. The work table 49 may.therefore be adjusted firrtherl `forward or backward b'y loosening f the nutsi12 on thevbolts "andsliding :the table 9 andthe bolts 10i into tlrevsaid' desiredposition. As-seen'inFiglS, the-work'table 9 is providedi with a s broad` shallow: notch; 13 -in itsy `fro-nt. edge,- tlie part 14 forming; the rrear shown in 4f Also" af correspondingly positioned notch 15? isf forneed in thel rear asoroad ias the 'notch 13 ybt' isvniuch deeper and onlyleavesa narrowpartl ofthe tabl-'e 9` r between` it `and the 'notch #13s The upper rearedge 17 of'the part" 16"'is' roundedfas desiredf T wo lateral fclits vor' slots. I18 'eXtend freni-the twoinnerfcorners of thenotcli115, parallel with lthe' front edge 4' ofv the? table 9, theffrontsides offftlreisaid: cuts '18' beingi'a continuation Aof Vthe rear: edge 17.of the vpart 16,':1 and are roundedto 'makel a"gradual change? ofi shape- 'from :thelevel of' the work table" 9 lto lthe rounded part 17 The sand belt 19y travels on topi of" theA workftable 9 over the part `161fthereof,' and'inay. extend slightly .overtli'e rounded part' 17 'as shown in'Fig; 4.' The particular 'dimensions -off the l part 1G yand its curved part '1T-'depends AVon the work to be done in the machin@7 different tables :being provided for differenti parts to besnro'othed.

A collar orosocketfQO issecured tothe base table 1V at a pointv towards therear and to one side of the notch 3 therein. AKV column 21 is adjustably securedin vertical position in the collar 20, being held in adjusted position bythe set screw 22. The column 21 may thereforebe Vadjusted either vertically Y or angularly about the axis thereof. The

column carries, at its upper end, a head 23,

Y through which the horizontal bar 24 passes,

therein byitheset screw 25.

and this 4bar is `held in adjusted position t The bar 24 extends towards the front and its front end is offset, as at 26, towards the notches 2 and Y 3. The frontend of the bar carries Vthe work brace board 27 Therefore, bymeans of the setrrscrew 22 the brace lboard 27 may be ad- 'i VYj-,usted -in vertical height and in horizontal AFig.-1, having a Vstraight horizontal lower edge 28.heldabove the part 16 of the workv 'table to permitthe sand belt 19 to pass be- Y Y. tween tlieparts 16 and 28 (Fig. 4). Also a Vdownward extending Vlob/e 29 projects Asharply. from the front end of the straight part 28 and anl opposite lobe 30 extends-upward Yfrom the rear'end of the said straight Vpartf28; The upper edge ofthe board 27 is curved to make a convenient shape to brace .the part beingv smoothed and to permit the operators left arm to pass over it when the l"part thereof being held by 'thevleft `hand is :in or Vnear the rear notch 3' in the base table V1. The brace board 27Y is adjusted', asrabove describedyin' order toV bring it into the desiredposition relatively tothe traveling sand belt 19. Normally, of course, this position fis iatright angles to the belt'but in certain,

icasesthe smoothed surface makes a different Langel with the adjacent surface and in such 'cases the brace board must be adjusted. to

bring it tothe desired new position. Y

- VThe sand belt 19 usedV in this machine may Ybei of any desiredzwidth but in practice I Vuse' narrow belts, ffroni 2i/8 inch wide to 4 inches fwide, jacoording to Ythe particular needs ofthe pieces being smoothed. As seen 'in Figlr vthe sand belt 19.is mounted on the two .wlieels 31` and 32. 'The wheel 32 is driven by any suitable means as by the drive Vbelt 33 Vand draws the sand belt- 19 through the-machine in such manner as to drag the vpiece being smoothed against theV working fsurface of the brace board 27.

i ',My improved scroll sanding machine yis Voperated briefly in the'following nianne'rr'- It is,- of course,'understood that the machine is Vintendedforiise in a factory where a large number of exactly similar rpieces are to be smoothed in a lot. The proper work vtable 9, and belt 19 are therefore selected for the lot to be worked on, and the table and brace board are adjusted to suit the work tobe done. This lot usually consists of pieces from l@ inch to 6 inches in thickness, such as chair back top rails, chair back banisters, buffet toilet frames, with dillerently shaped ornaments, and other similar parts. When the parts are very thin a number of them may be temporarily secured together in proper alignment and all smoothed together at the same time, thus reducing the time and the cost of production further. As indicated in Fig. 1, the outline of these pieces comprises straight portions combined with concave and convex portions. When the straight portion is to be smoothed it is held firmly down on that part of the sand belt traveling on the flat surface of the part 16 and is held against the brace board 27, the straight edge 28 of which engages the lower .edge ofthe portion being smoothed adjacent to the sanding belt, and keeps it steady and straight while the belt is acting on it; similarly when the portion to be smoothed is rounded or convex in outline, the sharp corner at the beginning of the convex portion is irst placed at the edge of the belt, the shape of the undercut part 14 of the table` 16 permitting the belt to enter into the extreme corner, and then the portion is rolled on the belt (Fig. 1, dotted lines) being held rmly down thereon and thus the said convex part is smoothed. However, when the part to be smoothed is concave in profile, it is placed with the said concave portion pressing the rear edge of the sand belt 19 down over the rounded part 17 of the table Y16 Fig. 4) the belt gradually bending down to t ie required shape along the cut 18. Thus -it will be seen that a scroll of any outline may be smoothed in this machine by Amanipulating it to bring its various surfaces successively on to the sanding belt, and that the brace board will steady it and will guide it so that it will not be forced out of the cor- Y rect angle by the pull of the sand belt on the surface.

Having described my invention, what I claim is 1. In a scroll sanding machine, the combination of a traveling sand belt, having its abrasive surface upward; a work table whereon said belt travels,'said table being notched in its front and rear edges to permit the portions of the scroll piece not being `sanded to swing beyond the plane of the sand belt and thus permit the portion being sanded to be rolled on the said sand belt; and a work brace board supported over the traveling sand belt and adapted to brace and to guide the scroll piece held thereagainst and pressed on the sand belt.

2. An apparatus as set forth in claim 1,

wherein the work table is adjustable relatively to the path of the belt, whereby the edge of the table is brought to the edge of said belt.

3. An apparatus as set forth in'claim l, wherein the work table is notched in its front edge and is undercut to permit the scroll piece to be placed with the edge of the belt entering a reentrant scroll corner. l

4. An apparatus as set forth in claim l, wherein the work table is notched in its rear edge and the upper corner thus formed is rounded to permit the sand belt to be bent down thereover to smooth a concave portion of the scroll.

5. An apparatus as set forth in claim l, wherein the Work table is notched in its rear edge and is provided with slot extensions to said notched part, the upper corner thus formed being rounded to permit the sand belt to be bent down thereover to smooth a concave portion of the scroll.

6. An apparatus as set forth in claim l, wherein the work brace board comprises a loW horizontal section positioned over the work table and separated therefrom by a space for the traveling sand belt, together with a downward extending front lobe and an upward extending rear lobe. p

Signed at Tacoma, Wash., this 2nd day of August, 1922.

EMIL F. BUTTS.

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