US1921513A - Floor finishing machine - Google Patents

Description

Aiig 8, 1933. A. N. EMMONS FLOOR FINISHING MACHINE Filed NOV. 9, 1928 INVENTOR.

Patented Aug 8, 1933' FLOOR FINISHING MACHINE Arthnr N. Emmons, Nedl'ow, N, Y., assignor to The Porter-Gable Machine Company, Syracase, N. Y., a Corporation of New York O Application Novemlicr 9, 1928. Serial No. 318,143 3 Claims. tel. 51-474) This invention relatesto abrading machines, particularlyportable abradin'g machines or surface. and'floor sanders, and has for its object means by which a ,floor board and the like can be finished close up to the end thereof with the grain of the wood without having the belt come in contact with surface at an angle to the end'of 'the board as a mop board, wall and the like.

The invention consists in the novel features of the belt 4 has an angular formation with the m and in the combinations and constructions hereinafterset forth and claimed.

In describing this invention, referenee is hard to the accompanying drawings in whichlike charactersdesignate corresponding parts inall the views.

Figure 1 is a side elevation vided with my invention.

Figure. 2 is a plan view thereof, partly broken away and parts being omitted. q Figure 3 is a fragmentary elevation of a modifled form of the nose or apex over which the belt Figure 4' is a fragmentary plang'view of the apex Y lustratedas provided by a felt padding 18. A

membershown inFigure 1.

The abrading machine comprises generally, a

' suitable frame 1, front and rear rollers 2, 3 suite,

ably mounted on the frame, an abrading belt i running over the rollers, means as an electric motor mounted in a housing 5 onthe frame and con- 3o nected to one of the rollers, as the rear roller 3 by any suitable mechanism, and means for deflecting the portion of the belt in front of the front roller to form an apex at the front of the machine, the run of. the belt from the lower side '35 of the apex bein'g in nearly a horizontal plane be-" low a plane tangent to the lowermost portion of the front roller 2, and the portion of the belt above the apex being inclined but slightly out of a vertical plane or extending a little distance in front 4, of a plane tangent to the frontmostiportion of the front roller 2.

- .The rear roller is supported-on a suitable axle and the front roller is preferably adjustable forwardly and rearwardly to tighten the belt, the

axle thereof being carried by a yoke 6 having a stem lslidable' in an opening in a block 8-forming 'part of the frame, the stem beingpressed in one direction by a spring 9 and havingan adjusting nut 10 for moving it against the action of a. spring. The. axle 11 for the front roller'is carried by an angle lever. 12 pivoted at its angle 13 to the yoke 6, one arm of the angle lever extending along a sidemember 14 of the yoke 6 and being connected thereto by suitable means, as a screw by which the lever 12 can be moved on its pivot 13 of a machine pro-' the .block 8 and spaced apart from the lower run ta varythe angularity of the axle for the purpose of causing the belt torun straight.

This invention comprises an apex or nose 15 extending transversely of the'front end-of the frame in front of the front roller 2, this apex lowerrun thereof adjacent the apex '15 located in nearly a horizontal plane and the portion on the upper side of the apex inclined slightly downwardly and forwardly out of a vertical plane.

The apex or nose 15 is provided on the :front end of a support 16 secured to the underside of of the belt and having a plate portion 17 deflected downwardlyslightly and extending under the front roller, the portion 17 constituting a pressure plate. Preferably, the pressure plate 17 is provided with a yielding portion over which the belt runs, this yielding portion being here ilroller 2'7 of small diameter may be provided at the front end portion 17 of. the support 16, the roller fitting a concave channel 28 at the front edge of the support and beingheld from endwise movement by. suitable means as notched lugs or forks 27 projecting forwardly from the bottom of the channel into a circumferential groove 30 in the roller. As seen in Figure 3, the roller may be omitted and the'padding 18 extendedaround the front end of the plate 1'7. In the construction shownin Figure 3, the padding is overlaid with a wearing surface as a thin sheet of metal 19 which is held at its front end and connected at its rear end to means for tightening it. It is held at its front end by a strip 20 overlying the upper margin of the plate 17 and screws 21 passing through the strip 20, the underlying margins of the sheet 19 and felt padding 18 and threading into the pressure plate. It is secured at its rear end to means operable to tighten it, this means being here shown-as one or more bolts 22 ar 1 d nuts 23, the bolts 22 extending through lugs as 241m the lower side of the'rear portion of the support 16, the bolts having hooks which enter suitable holes in the rear end of the sheet 19. The bolts are tightened by means of nuts 23.

The frame is provided with a suitable handle 25 and also with rollers or casters 26 at its rear end for supporting the rear end'of the belt oi! the floor or surface so that the belt bears on ,s re

:rz the surface being finishedbnly at a point adja- Ian abrading belt running over the rollers, and I vcent the nose or apex 15; the amount of bearing surface depending upon the adjustment of the rollers 26. Y

Owing to the apex 15 and the location thereof, a surface ora board can be finished to the end thereof with the grain of the wood without the front of the belt coming in contact with the men board or other surface board.

What I claim is: t, I

1. An abrading machine comprising a frame. front and rear rollers carried by the .frame, an abrading belt running over the rollers, and means located in front of the front roller and forming an apex located in front of and below the front roller, over which the belt runs frpm the front roller, said means being provided with a yielding pad on the lower side thereof and on means located in front of the front roller and forming an apex located in front of and below the ,front roller, over which the belt runs" from the front roller, said means being provided with a yielding pad on the lower side thereof and on the apex, over-which the belt runs and a sheet metal facing overlying the padding, and means for securing the re sheet metal, facing, and the at one end and means connected to the sheet at its other end for tensioning its I 3.4m abrading machine comprising a frame. J

front and rear rollers carried by the frame. an

abrading belt running over therollers, and means locatedinfr'on't of the front roller and forming an apex located in front of and below the front roller, over which the-belt rims from the front I roller, said means being provided with a yielding pad on the lower side thereof and on the apex.

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