US1191981A - Surfacing-machine. - Google Patents

Description

C. L. MATTISON.

SURFACING MACHINE. APPLICATION HLED' DEC-.21, 1914. 1,191,981. Patented 'July 25, 1916.

2 SHEETSSHEET I.

ED STATES FATE our CARL LAWRENCE MATTISON, 0F BELOI'I, WISCONSIN, ASSIGNOR T0 0. -MATTISON MACHINE WORKS, OF BELOIT, WISCONSIN, A CORPQRATION OF WISCONSIN.

sUnr AcING-MAcHINE.

Specification of Letters Patent.

Patented July 25, 1916..

Application filed December 21, 1914. Serial No. 878,228.

This invention relates to a surfacing machine of the type generally known as a rubbing or polishing machine, since it isusually employed for rubbing the varnished surface of an article of furniture during the process of finishing such surface. The machine, however, is also adapted for sandpapering and other similar operations.

It is one of the objects of the present in vention to produce an extremely compact machine of this character and one which is shorter in length than similar machinesheretofore known. I

Another object is to provide an improveddriving means for reciprocating the rubbing heads.

The invention also refers to improved guide means for the rubbing heads.

Another object of the invention is to provide improved means for preventing the polishing material from splashing up onto the bearings of the driving mechanism or onto the guideways for the rubbing heads.

Further objects and advantages will appear from the following detailed description.

In the accompanying drawings, Figure l is a longitudinal vertical sectional view through a surfacing machine embodying the features of my invention. Fig. 2 is a horizontal sectional plan view taken in the plane of line 2-2 of Fig. 1. Fig. 3 isa transverse vertical sectional view on line 33 of Fig. 1, Fig. 4 is a fragmental transverse section illustrating the guide means for the rubbing heads.

The machine shown in the drawings, which represents the preferred embodiment of my invention, comprises an elongated' lower portion of generally rectangular form and a circular upper portion disposed with its axis vertical and mounted on the middle of the lower portion. A pair of handles 9 fixed on opposite ends of the lower portion provide means for carrying the machine from place to place. The lower portion comprises a rectangular base frame 10 open at its lower side, and a top member 11 closlng the upper side of said frame and having a circular central portion 12. The upper part 13 constitutes the casing of an electric motor, the lower side of the casing being open. Between the lower edge of the casing 13 and the upper edge of the central portion 12 is a spider 14 having a central opening forming a bearing for the armature shaft 15 of the motor. Below the spider 14 the said armature shaft has teeth cut therein to upon pins or shafts 19 which are seated in sockets 20 in a transverse web of the member lland have squared upper ends 21 fitting into corresponding openings in the spider 14. 'The spur pinions 18 mesh with a central gear 22 which has :1, depending sleeve or hollow shaft 23 mounted in a ball bearing 24 in the member .11. Within the gear 22 is a bushing 25 which forms a bearing for the reduced lower end of the armature shaft 15. The described gearing reduces the high speed of the motor to a lower speed of the drive shaft or sleeve 23.

A double-throw crank-member 26, which may be of any suitable construction, has its upper end threaded into the lower end of the sleeve 23 and has its lower end rotatably mounted in a ball-bearing 27 mounted on a cross-bar 28 which is suitably supported at its ends by the rectangular base frame 10.

Pitmen 29 are connected to the opposite cranks of the crank-member 26, said pitmen extending in opposite directions from said member and being attached at their other ends to pivot pins which are seated in upstanding bosses 31 on the rubbing heads 32. Preferably, ball bearings 33 are provided at both ends of the pitmen 29.

'Each of the rubbing heads 32 is provided on its upper side with a pair of upwardly pointing wedge-shaped ribs 3-1 adapted to slide in guide grooves 35 formed in the lower faces of inwardly extending ledges 36 on the sides of the base frame 10. Vertical plates 43 are secured to the outer sides of the base frame and form dependin flanges which overlap the sides of the rubbing heads as shown in Fig. 3. Below the ribs 34 the heads 32 are horizontally undercut orgrooved to receive supporting ribs 37 which are formed on the inner sides of the .plates 43.

sides of the base frame 10. In the present 1 ary end plates 42 which extend from side to finishing furniture,

against the bearings of the drive mechanism,

instance the plate 39 is flat and one of the flanges 38 lies above and the other below said plate. At their outer sides the rubbing heads are slotted as at 40, and are provided with flanges 41 to cooperate with stationside of the base frame and completely close the open lower side thereof at the ends. The plates 42 are. turned up to provide end flanges 42? which in effect constitute a continuation of the end walls of thebase frame.

The rubbin heads-32 fit snugly between the plates or anges 43 .at opposite sides of the base frame so that the lower side of said frame is completely closed at all times by the central plate 39, the rubbing heads 32, and the end plates 42. This prevents any of the polishing material, commonly used in from splashing up or against the guideways for the. rubbing heads.

The lower side of each rubbing head has beveled faces 44 extending transversely of the direction of reciprocation ofthe rubbing heads. A rubbing shoe 45 for'each head is provided with undercutgrooves 46 in a stationary wall thereof and in a movable clampbar 47 to cooperate with the beveled faces 44 on the rubbinghead. The clamp-bar 47 is adjustably secured to the rubbing shoe by means of set screws 48. To the lower faces of the rubbing shoes are secured layers of' felt 49 or othersuitable material. If the machine is to be used for sand-papering, a sheet of sand-paper is attached to the lower side of each rubbing shoe.

It will be noted that when the rubbing heads are in their innermost position, as

shown in Fig. l, the driving pitmen 29 overlap each other to a considerable extent, so that a very compact construction is afforded, and the rubbing heads can approach each other very closely. By providing the central stationary splash-plate 39, the overlapping lnner' flanges 38.can bemade much shorter so that the rubbing heads-may come close together, and the said stationary plate will close the gap between the flanges when the rubbing heads are in their outermost position, so as to keep the lower side of the cas- 1ng constantly closed.

While I have herein described the preferred embodiment of my invention in, con-' siderable detail, I do not thereby intend to limit the invention to the form disclosed, ex-

cept'as recited in the appended claims.

I claim as my invention:

1. A surfacing machine having, in combi-' nation, a rectangular base frame, a top member closing the upper side of said frame and having a central circular chambered portion projecting upwardly, an electric motor disposed with its-axis in a vertical plane and having its casing shaped to fit upon and be supported by the upper edge of said circular portion, the motor having an armature shaft projecting down into the circular portion, a horizontal web extending across said circular portion and having bearings therein, reducing gearing supported in certain of said bearings and connected to said armature inv said web in alinement with the armature shaft and connected to said gearing to be driven at a reduced speed by the latter, a pair of slidable rubbing heads mounted in said base frame, and means operatively connecting said heads to said driving member.

2. In .a surfacing machine, in combination, a body having an open lower side, a centrally positioned stationary member partially closing the said open side, and a pair of surfacing elements reciprocably mounted on the body at opposite sides of said member and arranged to move toward and away from said member, said elements having parts cooperating with said stationary member to assist in closing said open side.

3. In a surfacing machine, in combination, a body having an open lower side, a pair of surfacing elements reciprocably mounted atthe lower side of the body,- a stationary horizontal plate mounted on the body between said elements, and horizontal guard flanges on the surfacing elements projecting toward each other and lying one above and one below said horizontal plate to cooperate therewith in closing-the said open side of the body.

4. In a surfacing machine, in combination, a body having an open lower side,

members fixed at opposite ends of the body and flanges adapted to slidably coact with said plates to assist in closing the said open side.

'6. In a surfacing achine, in combination, a body having an open lower side, a pair of surfacing elements reciprocably mounted at the lower side of the body, a stationary central. member and stationary end members arranged to partially close said lower side, and a pair of surfacing elements adapted to coact with said central member and end members, whereby to maintain said lower open side completely closed at all times.

7. In a surfacing machine, in combination, a body having an open lower side, a

central horizontal plate and end horizontal plates partially closing said open side, and a pair of surfacing elements reciprocably. mounted adjacent to the open side and having horizontal flanges to slidably coact with said horizontal plates, the inner flanges lying one above and one below the central plate.

8. In a surfacing machine, in combination, a body having an open lower side, a centrally positioned stationary member adjacent to the lower side, a pair of surfacing elements reciprocably associated with the body at opposite sides of said member, flanges on said elements extending toward each other and overlapping each other when the surfacing elements are at their inner end of the stroke, the said member filling the gap between said flanges when thesurfacing elements are at the outer ends of their stroke. a

9. A surfacing machine comprising an elongated rectangular base frame, a top member'closing the upper side thereof and having a central circular portion, an electric motor disposed with its axis in a vertical plane and mounted on said circular portion, a pair of slidable surfacing elements, and means within said base frame connecting the motor to said surfacing elements for reciprocating the latter. I

10. In a surfacing machine,- in combination, a rectangular base frame, a top member closing the upper sideof said frame and having a circular central upwardly projecting portion, an electric motor disposed with its axis vertical and comprising a casing having an open lower end resting upon the said circular central portion of the top member, reducing gearing mounted in said top member and driven by the motor, a pair of slidable rubbing heads mounted in said base frame, and crank means connecting thereducing gearing to said rubbing heads for reciprocating the latter.

'11. In a surfacing machine. in combination, a base having members provided at their lower faces with downwardly opening V-shapecl guide-grooves, a pair of rubbing heads mounted -beneath the A base, a pair of upwardly pointing wedge-shaped ribs mounted on opposite sides -of each of the rubbing heads, the latter being undercut or grooved at opposite sides, and rails engaging in said grooves forsupporting the rubblng heads when the machine is lifted.

12. In a surfacing machine, in combination, a base having therein downwardly facing V-shaped guide-grooves, a pair of rubbing heads mounted beneath the base frame, and upwardly pointing wedge-shaped ribs on said rubbing heads adapted to slide in said V-shaped grooves in the base.

13. In a surfacing machine, in combination, a rectangular baseframe having inwardly extending ledges at opposite sides thereof, said ledges having in the lower faces downwardly opening V-shaped guide- .grooves, a pair of rubbing heads mounted beneath opposite ends of said base frame and each having a pair of upwardly pointing wedge-shaped ribs adapted to enter and slide 1 I ,in said guide-grooves, and means fixed on the base frame and engaging in said heads for supporting the latter when the machine is lifted.-

v H. In a surfacing tion. a rectan ular base frame having inwardly extendlng ledges running along opp'osite sides thereof, the said ledges having in their lower faces downwardly opening V-shaped guide-grooves, a pair of rubbing heads mounted beneath opposite ends of said frame, a pair'of upwardly pointing wedgeshaped ribs on opposite sides of each rub; bing head adapted to enter said guidegrooves, each of said heads belng undercut or grooved at opposite sides, and a pair of rails fixed at the under side of said ledges 'machine, in combina and enteringthe grooves in the rubbing heads for supporting'the latter whenthe machine is lifted. v I

15. In a surfacing machine. in combination, a body having an open lower side, a pair of surfacing elements mounted atsald lower side 'to reciprocate toward and away from each other, and means for maintaining said lower side closed against the entrance of material from below, said means comprising a member stationarily mounted on the body between said surfaclng elements and parts moving with said surfacingelements and arranged to overlap said member.

In testimony whereof, I hereunto setmy hand in the presence of two witnesses.

J. V. DOWNING, E. M. IRISH.

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