US1706402A - Surface-finishing device - Google Patents

Description

March 26, 1929. A HAWN l SURFACE FINISHING' DEVICE Filed April 28, 1927 l v l I1/Wenko@ $55297' fyf/ff/y r l f fltfozueq Patented Mar. 26, 1929.

UNITED STATES 1,706,402 PATENT OFFICE.

ALBERT I.` HAWN, OIF DENVER, COLORADO, ASSIGNOR 0F ONE-HALF T0 DOROTHY i STEPHENSON HAWN, 0l," DENVER, COLORADQ.

sUnFAcE-FINIsHING DEVICE Application iiled April 28,

This invention relates to a device and a medium for rubbing down surfaces. It is more particularly designed for rubbing down the various coats of lacquer, enamel or varnlsh upon the body of an automobile, but willvbe found valuable in any application requiring a similar action.

The principal object of the invention is to provide a motor operated rubbing surface to which a liquid or a mixtureeof a liquid and an abrasive will be Constantly fed.

Another object of the invention is to so construct t-he device that. the liquid will be fed at the vortex of a rotating surface so that i it will be spread evenly outwjardly by the rotating action.

A further object is to provide a medium for use with the device which will embody an abrasive in a binder so that, as the binder wears down, new abrasive surfaces will be constantly exposed.

Other objects and advantages reside in the detail construction ofthe invention, which is designed for simplicity, economy and eliiciency. These will become more apparent from lthe following description.

In the following detailed description of the invention, l reference is had to the accompanying drawing which forms a part hereof. `Like numerals refer to like parts in all views of the drawing and throughout the de- Scription. l

In the drawing: c f Fig. 1 is a side elevation, partly in section,

of my improved surface finishing device.

Fig. 2 is a rear elevation thereof.

Fig. 3 is a detail view illustrating my im proved rubbing down medium.

The invention comprises an electric motor 10, the shaft 1l of which extends entirely through both motor faces. An axial passage 1 14 extends `the entire length of the shaft 11 opening to vboth extremities thereof. The motor 10 is provided with a handle 12 from which a trigger operatedswitch 13 is easily accessible for controlling the motor.

On one extremity of the shaft 11 a rubbing disc 15 is carried. The disc 15 is formed of comparatively soft rubber or similar resilient material and is vulcanlzed around a sp1der 16 carried on a collar 33 which is secured to the shaft 11 by means of a suitable set screw 17. In the disc 15 a central passage` 18jis formed which communicates with the passage 14. The face of the disc 15 is concave as 1927. Serial No. 187,228.

the disc has been Worn down to these layers,

they will indicate to the operator that the disc should be discarded or replaced before the spider 16 is exposed to cause damage'to v the surface being worked on.

On the rear of the motor 10 a packing gland plate 21 is secured about the shaft 11 to which is clamped a cap 22 by meanslof suitable screws 23. As the cap is screwed in place, it will compress packing 24 around the shaft within the gland plate 21 and a packing washer 25 against the gland plate 21 to insure a liquid tight seal about the shaft 11 and between the cap 22 and the gland plate 21.

Fromthe cap 22 a feed passage 26 leads to a needle valve 27 which controls the entrance of iuid 'to the cap from a nipple 28. The

fluid is led to the nipple 28 through a iexible hose 29 which passes through the handle 12 and slips over the extremity of the nipple 28. The hose 29 is attached to an electric feed cable 30 which supplies current to the motor 10'by means of suitable clips 31. In this way the electric cable and Huid hose act as a single unit and are easily handled by the operator.

The rubbing disc 15 may be of plain rubber in which case an abrasive substance such as emery, carborundum, pumice stone, or the like, is admixed with a suitable fluid, depending upon the surface being finished, such as rubbing oil or water. This mixture is fed to the disc 15 through the passage 18. The disc,

however, may be formed as illustrated in Fig. 3, of a rubber or similar resilient base material in which the articles of abrasives, indicated at 32, areem edded or vulcanized. By this construction asy the disc wears away new abrasive particles are being constantly presented to the rubbed surface, rubbing 011 or water being fed through the passage.

In use, the operator sets the needle valve 27 to deliver the proper supply of liquid to the disc 15. Then itis only necessary to place the disc against the surface and work it thereover. The iexible edges of the disc will bend backwardl flattening out the concavity 19 entirely. he entire disc surface then contacts with the rubbed surface with equal pressure. The natural centrifugal action of the rotating disc will Work the liquid uni? formly toward its periphery.

While a specic form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, Within the scope of the Vappended claims, Without departing from the spirit of the invention.

Having thus described the invention, what Iclaiin and desire to secure by Letters Patent 1s 1. A surface olishing disc comprising a circular disc of exible material; a spider em- 15 bedded in ysaid material; and a collar carried by said spider and adapted to connect with an operating shaft; and a layer of fabric embedded in said material over said spider.

2. A surface polishing disc comprising a circular disc of flexible material; a spider embedded in said material; a collar carried by said spider and adapted to connect with an operating shaft; and a layer of fabric embedded in said material over said spider7 said ydisc having a central passage communicating therethrough and adapted to connect with a similar passage in said shaft.

In testimony whereof, 'I affix my signature.

ALBERT I. HAWN. y

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