US1669094A - Sanding machine - Google Patents

Description

May 8. 1928.

1,669,094 A4 R. LANDQUlsT SANDING MACHINE Filed May 29. 1926 2 Sheets-She 1 May s, 192s. 1,669,094

A. R. LANDQUIST SANDING MACHINE Filed May 1926 2 Sheets-Sheet 2 Patented May 8,1928. i

4Ppxrlazlar oFFICE.

ANDREW n. IiANDoUIsT, or MINNEAPOLIS, MINNESOTA.

SAN DING MACHINE.

Aliplieauon med may v29,Y

This invention relates toa sanding 4machine particularly adapted for use 1n connection with the sandingv `of articles having surfaces thereon of varying heights and fvarying curvatures such, for example, as Schooldesls and` seats, tables, chairs, etc;V

` It is an object of this invention to provide ay sanding Vmachine having a sanding`"'belt therein mounted on a carriage ywhich will' be vertically adjustable to quickly position the working run of the sanding belts'at various heights.

Itis another *objectA of the invention to provide in such av machineA a counter-balanced carriage upon which the sanding belt is mounted.

These'and other objects and advantages of the invention will more fully appear from the following description made in connection with the accom anying drawings in which like reference c aracters refer to the saine or similar parts throughout the several views and in which Fig. 1 is` a view in front elevation of the device, certain of th'e parts being broken away; v v Fig. 2 is a horizontal section taken on the line 2--2l of Fig. 1 as indicated by the arrows; and A 3Q Fig. 3 is a vertical section takenpn the line 3 3 of Fig. 1 as indicated by `the arrows. 'y

Referring to the drawings, preferably a base a is provided havinglsecuredjthereto the vertical standards rectangularly spaced in yrelation to onenanother .to form an upright frame preferably gof greater length than. width; The end standards .5 of the `'frame are transversely connected together at their tops by the bars 6 shown as I bars extending transversely ofthe frame. Facing inwardly from the yends of the frame, the tracks 7, shownas I bars, are provided secured to the standards 5 and extending vided comprising guide members 8, shown as inwardly flanged channel bars which slidably engage with tracks 7, and the bars 9,

shown as channel bars, secured to-the guide members 8 and extending longitudinally of lthe frame between the Vrespective front and rear members'8. V The .ends of 4the carriage are connectedtogether by suitable bracing 10 extending between the respective end guides while the angular braces 11 are preferably provided connected tothe bars 9 and substantially vertically. A carriage is pro 1926. seriaiNo. 112,499.

`to the guides 8 at spaced points. LBars-12, `shown as angle bars, are secured to the bars 6 inwardly of the standards 5` and extend longitudinally of the frame formed bysaid standards at the top thereof. y i f l n Two bars13 are fixed .transversely between the bars 9 `at the central portion of the1,car riagc and form a seat upon which ya motor 14 ofany common Vtype may be secured. The Inotor `14 has an elongated shaft-,projecting rearwardly therefrom upon which .is mounted the pulley 15, the rear end of the shaft being journaled in the bearing 16 secured to the rear bar 9. Horizontal shafts 17 and 17a are journaled in bearings 18sel cured adjacent the lower ends of the guide members 8. An endless belt 19 placed over` pulley 15 drives one of the shafts, as 17, through the pulley 2O secured on the shaft opposite the pulley 15, the shaft accordingly forming the drive .shaft for the machine.

Sanding belt pulle s 21 are secured to shafts 17 and 17'a at their front ends forward of the front bearings 18. A shaft 22 journaled in bearings 23 and 24, secured respectively tothe front bar 9 and the barsvlQ, carries the pulley Q5 thereon extending forwardly` of. the front-bar 9 of the carriage and alined with the `pulleys 21. Asanding belt 26 having an jabra-sive outer surface fits overthe pulleys 21 `and 25, the 'belt beingloosely stretched over the pililleys." A bracket 127" extends downwardly from `the frontrbarj9 of the carriage and has `pivoted thereto the armQS to one Vend of which in turn .the pulley,k 29 is journaled, said` arm 28 having its 4other end. Pulley 29v extends forwardly `of arm LQS-and is adapted ,to contact the conveniently raising, or lowering the car- `the adjustable weight 30 lsecuredthereto at riage in the frame. Brackets 35 securedto the inner rsides ofthe bars 9 and .projecting downwardly therefrom have journaled therein theshaft y36 provided at itsj outer endy withV the steering wheel. 37 and havingjsecured at itsfkcentral portion thek drum 38.

Arected when in operation.

' comprising a body portion 42, bearings 43,

axles 44 and flanged wheels 45 secured at the Vouter ends of the axles 44, is placed on the tracks 41. A dust collecting casing 46 having the sliding door 47 at its lower extremity is secured at the front side of a front stand ard 5 at the end of the frame towards which the working run of the sanding belt is di- Casing 46 partially encompasses one of the pulleys 21.

Rotating tools as the sanding disk 48 secured to shaft 17 and the drill chuck 49 secured to shaft 17a may be placed on the free ends ofthe shafts 17 and 17 a.

Operation.

An article to be sanded is placed on the body portion 42 of the work holding platform and the platform is pushed inwardly on the tracks 41 towards the rear of the frame until the portion of the surface of the article to be operated upon isplaced directly below the sanding' belt 26. The carriage is n ow slidably lowered by rotation of the steering wheel 37 of the steering wheel windlass until the lower or working run of the belt 26 is positioned with its abrasive surface closely adjacent the surface of the article to be sanded, the guidemembers 8 of the carriage sliding downwardly on the tracks 7 ofthe frame until this position is reached. The

- weights 34 will counter-balance the carriage so that the same'will be capable of being quickly and readily moved as the drum of the steering'wheel windlass is turned. The motor 14 may now be started and power will be'transmit-ted through the pulley 15, belt 19, pulley 20, shaft 17 and pulley 21 fixed on shaft 17 to the sanding belt 26. The sanding belt 26 will vaccordingly be rapidly rotated over the pulleys 21 and 25. An operator may now stand in front of the article to be sanded and by a suitably shaped block (not shown) may hold the working run of the belt against the surface to be sanded. As the belt 26 fits loosely over the pulleys, the same may be curved to fit the various curvatures of the article operated upon. IThe belt tightener comprising the members 28, 29 and 30 will properly tension the belt at all times to prevent the same from slipping. By varying'the position of the' weight 30 on the arm 28, the tension of the belt tightener may lb@ varied. f The majority of dust from the sanding operation will be carried by the belt 26 to the dust collecting casing 46, the sliding door 47 providing a handy means for removal of the dust from the casing 46. As the work progresses, the work-holding platform maybe pushed to `or from the belt as desired, to operate upon various portions of the surface of the'article.

When it is desired to vary the vertical position of the working run of the sanding belt, as for example, when a surface of an article standing at a greater height or lesser height than the surface being worked upon is tobe operated upon, the windlass wheel 37 may again be revolved and the carriage and lower run of the sanding belt accordingly `quickly raised or lowered through the sliding engagement of the guide members 8 with the tracks 7 until the proper vertical level is reached.

As in the present invention all the operating mechanism for the sanding belt is mounted directly upon the sliding carriage, no adjustment of power transmission mechanism is necessary when the vertical position of the sanding belt is changed. The device can accordingly be quickly and easily raised or lowered to properly position the sanding belt for engagement with articles of variable heights.

When the machine is not in use, the workholding platform may be pushed inwardly under the carriage to the position shown in Fig. 2 so that the platform will be out of the way. The sanding disk 48 and drill chuck 49 or other rotating tools that may be carried by the shafts 17 and 17a will be found convenient for use in connection with the other parts of the machine.

Various types of abrasive or polishing belts may be used in connection with the machine, the device being equally eective for polishing articles as for sanding them. The specific type of belt tightener, steering wheel windlass, and counter-balancing vmeans may be varied, while the positions of the motor, driving shaft and the sanding belt pullleys may be changed as desired. The frame and carriage construction can also be considerably varied.

lllhe device comprises few parts, is simple in operation and may be comparatively cheaply made and assembled. The device has been amply demonstrated in actual practice and has been found to be very successful for the purposes set forth.'

It will, of course, be understood that various changes may be made in the form, details, arrangments and proportions of the parts Vwithout departing from the scopepof applicants invention which, generally stated, consists in the matter yshown and described and set forth in the appended claims.

`What is claimed is: V

1. A sanding machine having in combination, rectangularly spaced standards forming vertical tracks, a carriage slidable on said tracks, a motor mounted onksaid carriage, al plurality of pulleys mounted for rotation on said carriage, means for driving one of said pulleys from said motor, an abrasive belt adapted to run over said pulleys, the lower run of said belt projecting downwardly from said carriage, means for counter-balancing said carriage to hold the same in any desired position or to permit the same being quickly shifted to different levels, and means for moving the carriageto any desired level.

2. The structure defined in claim 1, said last mentioned means comprising a cable secured at both ends to stationary supports 4and extending substantially vertically beside the carriage, and a drum journaled in said carriage and around which the medial portion of said cable is wound, the said drum being capable of being turned.l

In testimony whereof I affix my'signature.

' f ANDREW R. LAIIDQUIST.y

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