US2311346A - Sandpapering machine - Google Patents

Description

Feb. 16, 1943 T. N

SANDPAPERING MACHINE 2 Sheets-Sheet 1 Filed March 26, 1942 Inventor Ja'bipk 2 1120272 1 Feb. 16, 1943. A. T; MUNN 2,311,346

SANDPAPERING MACHINE Filed March 26, 1942 2 Sheets-Sheet 2 Patented Feb. 16, 1943 OFFICE SANDPAPERING MACHINE Adolph T. Munn, Pageland, S. C. Application March 26, 1942, Serial No. 436,348

3 Claims.

My invention'relates to improvements in sandpapering machines for use in dressing down boards or planks. a

The invention is designed with the particular object in view of providing a simply constructed machine equipped for quickly and evenly sandpapering boards, or planks, of different gauge and which is economical to operate, install and service.

To the accomplishment of the above, and. subordinate objects presently appearing, a preferred embodiment of my invention has been illustrated in the accompanying drawings, set forth in detail in the succeeding description, and defined in the claims appended hereto.

In said drawings: a

Fig. 1 is a view in side elevation of a sandpapering machine embodying my improvements,

Figure 2 is a View in top plan, partly broken away,

Figure 3 is a fragmentary view in longitudinal vertical section, taken on the line 33 of Figure 2, and drawn to an enlarged scale, Figure 4 is a view in transverse section, taken on the line 44 of Figure 1, and drawn to an enlarged scale, and

Figure 5 is a similar view, taken on the line 5-5 of Figure l.

Referring to the drawings by numerals, my improved sandpapering machine comprises an elongated, rectangular bed I, of any suitable material, supported by side and end frame members 2, 3 forming a'rectangular frame beneath said bed I and which is in turn supported by corner legs 4.

Adjacent the transverse center of the bed I and also one end thereof are pairs of lower and upper transverse rollers 5, 6 for feeding boards or planks endwise therebetween longitudinally of the bed I. means presently described, and fastupon transverse shafts I journaled at their ends in bearing brackets 8 depending from the side members 2. The upper rollers 6 are idling pressure members fast upon shafts forming end trunnions 9 on said rollers and which are rotatable and vertically movable in vertically grooved bearing brackets H ari ing from opposite sides of the bed I and connected in pairs by upper transverse bars l2. Tension means is provided for each upper roller 6 for urging the same downwardly and comprising a hand screw l3 threaded downwardly through the bar 12 above the roller 6 for turning against an upwardly bowed leaf spring l4 having its ends projecting into the grooves of the bearing brack- The lower rollers 5 are driven, by

ets H and resting upon blocks l5 vertically slidable in said grooves and seated on the trunnions 9 of said roller 6.

Intermediate the described pairs of rollers 5, 6 and surmounting the bed I is a substantially rectangular sanding head 16 of flat form mounted, by means presently described, for reciprocation longitudinally of said bed with its sides parallel with the sides of said bed I. The mounting for the sanding head llicomprises a carriage including a pair of side rails I'l extending lengthwise along the outer sides of the members 2 and provided with longitudinally extending guides I8 slidable in suitable guideways l9 extending longitudinally along the outer sides of the members 2. A cross-bar 20 extending beneath the members 2 connects the rails I! in the transverse center thereof. A pair of forked ears 2! arise from each rail 11 adjacent the ends thereof, respectively, and which accommodate therein studs 22 extending laterally from the sides of the sanding head l6, whereby said head is coupled to the rails l1 and vertically movable relative thereto. Cotter pin 23 may be provided in the outer ends of the studs 22 for a purpose which will be apparent.

Tension means for exerting downward pressure on the sanding head I6 is provided as follows: Spanning the sanding head It in the transverse center thereof is a bar-like yoke of inverted U form having a vertical side leg 24 pivoted, as at, 25, to an upright 26 on the beforementioned. bar 20, and an opposite side leg- 21 adapted to rest on an upright 28 arising from the other end of the bar 20. A suitable latch is provided for securing the leg 21 to the upright 28. A hand screw 30 extends through the centerlof the described yoke in upright position. An upwardly arched spider 3|, is secured, as at am, to the top of the sanding block l6, saidspider have ing an apertured hub 32 slidable on the lower end of the hand screw 30 and retained on thefhand screw by means of a cotter pin 33 passing through the lower end of said hand screw. A coil spring 34 sleeved onto the hand screw 30 between said hub 32 and a collar 35 on said screw tends to urge the spider 3!, and hence the sanding head l6, downwardly.

The sanding head I6 is designed to carry a sheet of sandpaper, or the like, 36 stretched across the bottom face of the head with edges turned up alongside the transverse edges of said head. For securing the sheet of sandpaper 36 to the head, a pair of resilient bowed clamping bails 31 are provided to extend alongside said transverse edges of the sanding head to clamp the upturned edges of the sheet to the head, said bails 31 being pivoted, as at 38, to the sides of the head for vertical swinging to releasing position.

Driving means for reciprocating the described carriage and sanding head is provided and will now be described in detail. Adjacent one end of the bed I an electric motor 39 is suitably suspended from one of the members 2 and provided with a belt pulley 40 on the armature shaft 4| thereof which is connected by a belt 42 to a relatively larger pulley wheel 43 fast on one end of a transverse shaft 44 suitably journaled at its ends on the members 2. The pulley wheel 43 is provided with a crank pin 45 coacting with a vertically slotted head 46 on one end of a slidebar 47, the other end of which is fastened, as at 48, to one of the rails II. The slide bar 41 is suitably guided for endwise movement in bearings, as at 48, provided on one of the side members 2. Obviously, as the pulley wheel 43 is rotated, the slide bar 41 will be reciprocated and similar motion imparted to the sanding head l6 through the medium of the described carriage therefor. Any suitable means may be provided for controlling the motor 39.

Coming now to the drive for the lower rollers 5, extending along one member 2 is a worm shaft 49 suitably journaled in bearing brackets 50 depending from said member and provided with worm sections 5| meshing with a pair of worm wheels 52 fast on the before mentioned shafts 1, respectively. A jack shaft 53 operatively connected to the worm shaft 49 by bevel gearing 54 and suitably journaled in fixed bearings 55 opcrates said worm shaft 49. Intermediate the shaft 44 and jack shaft 53 is a suitably mounted reverse gearing including a worm wheel 59, a pair of worm shafts 5'! upon opposite sides of said wheel 56, and adapted to drive the same in opposite directions, respectively, a shaft 58 driven from the worm wheel 56 by bevel gearing 59 and operatively connected to the jack shaft 53 by bevel gearing 60; and a twin bevel gear unit 6| splined on the shaft 44 for shifting in opposite directions into mesh with bevel gears 62 on the worm shafts '51, respectively. A suitable shifter 62 operative by a slide rod 63 is provided for shifting the unit 6|.

The operation of the described machine will be readily understood. A board, or plank, 64 to be sandpapered is inserted between the rollers 5, 6 of either pair and underneath the sanding head I6 to be fed along the bed I in eitherdirection by said rollers according to the direction of the drive of said rollers as determined by a setting of the described reverse gearing. As the board is fed, the sanding head [6 is reciprocated over the same, as will be clear. As the sandpapering operation progresses along the board, it is fed in between the next pair of rollers 5, ,6 to be fed by said rollersalso. By unlatching the described yoke and swinging the same upwardly on the hinge 25, access may be had to the sanding head I6 to replace the sheet of sandpaper 36 when the latter becomes worn.

As will be understood from an inspection of Figure 3, the rollers 5 extend into transverse slots 65 in the bed I to engage the under side of the board, or plank,*64.

The foregoing will, it is believed, sufiice to impart a clear understanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modification without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the subjoined claims.

What is claimed is:

1. A board and plank sanding machine of the class described, comprising a bed upon which the work is adapted to be placed for sanding purposes, means on said bed for frictionally engaging and feeding and guiding the work, a carriage structure mounted for reciprocation on said bed, said carriage comprising parallelslidably mounted rails with upstanding notched lugs, a sandpaper block cradled in said lugs, a yoke carried by S id rails and spannin said block, and spring tensioning means on the yoke cooperating with the block, together with operating means for said carriage.

2. In a sanding machine, a bed, a reciprocating carriage'on the bed comprising a pair of parallel side rails having upstanding notched lugs, a sanding block having members fitting in said notches to support the block on said rails, means on said block for detachably attaching sheets of sandpaper thereto, and means to exert tension downwardly against said block comprising a yoke upstanding from said rails in straddling relation to the block and bed and having a top bar, a hand screw depending through said bar, a spider on said block in which one end of the screw is rotatably and slidably mounted, and spring means urging the spider downwardly of said screw.

3. In a sanding machine, a bed, a reciprocating carriage on the bed comprising a pairof parallel side rails having upstanding notched lugs, a sanding block having members fitting in said notches to support the block on said rails, means on said block fordetachably attaching sheetsof sandpaper thereto, and means to exert tension downwardly against said block comprising a yoke upstanding from said rails in straddling relation to the block and bed and having a top bar, a hand screw depending through said bar, a spider on said block in which one end of the screw is rotatably and slidably mounted, and spring means urging the spider downwardly of said screw, said yoke being hinged to one of said rails to be swung laterally clear of the bed, and said block, screw and spider being inseparable for swinging of the same with said yoke.

ADOLPH T. 'MUNN.

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