US2332613A

US2332613A - Sander attachment

Info

Publication number: US2332613A
Application number: US440223A
Authority: US
Inventors: Lewis R Swank
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-04-23
Filing date: 1942-04-23
Publication date: 1943-10-26
Anticipated expiration: 1960-10-26

Description

Oct. 2.6,V 1943. l. R. swANK SANDER ATTACHMENT v Filed April 23, 1942 2 Sheets-Sheet 1 @www 0000 OOOO Oct. 26, 1943. L. R. swANK SANDER ATTACHMENT Filed April 23, 1942 2 Sheets-Sheet 2 Patented Oct. 26, 1943 UNITED, STATES PATENT OFFICE SANDER ATTACHMENT Lewis R. Swank, Lewiston, Idaho Application April 23, 1942, Serial No. 440,223

Claims.

This invention relates to an attachment for a portable sanding machine and while capable of use generally it is primarily adapted for feather edging paint wherever spot jobs are made and for conditioning metal'which has been sanded with a coarse, disc sander or the equivalent.

It is aimed to provide a novel means preferably readily attachable to and detachable from the sander which includes an arm carrying the abrading element and to which arm an eccentric motion is imparted from the power-take-off shaft of the sander.

It is also an object to provide such a construction wherein said arm has a ball connec-` tion with a novel handle provided with means for gripping the handle of the sander.

The more specific objects and advantages will in part be pointed out and will otherwise become apparent as the description of one operative form is hereinafter described with relation to accompanying drawings.

In said drawings:

Figure 1 is a side elevation showing my im provement applied to a sander;

Figure 2 is a bottom or inverted plan view of the parts of Figure 1;

Figure 3 is a vertical section taken on the line 3 3 of Figure 1;

Figure 4 is a horizontal section taken on the line o1 4 4 of Figure 1;

Figure 5 is a vertical section taken on the line 5 5 of Fig. 2;

Figure 6 is a vertical section taken on the line 6 6 of Figure 4; and,

. disc means I4 is removably fastened and which is adapted for mounting an abrading element thereagainst. Such shaft I3 at its lower end has a screw threaded socket I5 usually entered by screw means to secure the disc means I 4 in place.

My improvements with the sander described are of such a nature that they be readily attached thereto or detached therefrom so that the sander is not impaired for normal use as well as use in accordance with my invention.

In carrying out or practicing the invention, an arm or body I6 of wood, steel, aluminum or any other desired metal or material is provided. Adjacent one end, arm I6 carries an abrading element Il which may be a blockof sponge rubber throughout which the abrading material is dispersed, or it may be of any other material or character. This element is gripped or detachably held in place between jaws I8 and I9. Jaws I8 and I9 are pivotally connected together and to the arm I6 by means of an endless frame 29. Pivoted on the frame 20 yis a lever 22 which is adapted for cam or binding engagement with a notch 23 in the jaw I9 to fasten the jaws in gripping engagement with the abrading element.

Adjacent the other end, the arm I6 is anchored in a ball 24 which in turn has 'bearing in a bracket or socket 25 which is adjustably connected by means of a bolt 26 or equivalent, to an open or endless handle 21. Said handle 21 depends from a clasp or grip 28, for instance, of U=shape, as shown, and it is fastened to the latter by rivets or any equivalent means at 29. Clasp 28 is resilient and readily clips `on and oif the handle I2 as shown.

An eccentric drive connection for the arm I6 is provided between the same and the shaft I3 at a point between the bearing ball 24 and the abrading element I1. This eccentric connection consists of an eccentric or cam generally designated 39 and consisting of a counterweight disc 3I and a disc bearing 32 integral therewith but offset therefrom. An anchoring stud 33 projects from the disc 3I and is screw threaded into the socket I5 so that the eccentric element will be rotated through the rotation of the power takeoff shaft I3. The offset disc 32 is journaled in a bushing or cup 34 fastened to the arm I6. This bushing 34, may have a pair of pins 35 which removably engage recesses 36 in the arm. A stud screw 31 has an enlarged or bearing portion 38 journaled in an opening in the arm I6 at 39 and a screw threaded shank 40 extends loosely through the bottom wall of the cup and is screw threaded in a recess 4I of the disc 32.

- Thrust discs 42 may be interposed between the anti-friction ball bearing or other means may be used in connection therewith.

In the use of the device, the sander may be held as usual or it may be gripped by the handle 21 and that the operation of its motor rotates the power take-oft shaft I3 which in turn imparts an eccentric movement to the arm I 8 so that an abrading motion is given to the abrading element I1, the arm moving on the ball at 24.

Various changes may be resorted to provided they fall within the spirit and scope of the invention as deiined by the appended claims.

I claim as my invention:

1. In combination with a sander and its power take-oil shaft, an abradant-carrying arm, a grip attachable to the sander, a means pivoting the arm to the grip, a frame extending from the' grip, a bracket attached to the frame, said arm extending through a ball, said ball being journaied on said bracket, and an eccentric drive from the power take-off shaft to said arm.

2. In combination with a sander and its power take-on* shaft, an abradant-carrying arm, a grip attachable tc the sander, a means pivoting the arm to the grip, a frame extending from the grip, a bracket attached to the frame, said arm extending through a ball, said ball being journaled on said bracket, an eccentric drive from the power take-o shaft to said arm comprising an eccentric element having a stud attachable in a socket on said shaft, an offset disc on said element, a bushing on said arm, and a fasteningr journaled in the arm and bushing connected to the offset element.

3. In combination with a sander and its power take-oft shaft, an abradant-carrying arm, means pivoting the arm to the sander, said shaft having a screw threaded opening, an eccentric element having a stud secured in said` opening, a counter-weight disc pn said element, an offset disc on said element, a bushing on said arm in which the'second mentioned disc is jcurnaled, and a fastening passing loosely through the arm and connected to the second mentioned disc.

4. In combination with a sander and its power take-oil shaft, an abradant-carrying arm, means pivoting the arm to the sander, said shaft hav ing a screw threaded opening, an eccentric element having a stud secured in said opening, a counter-weight disc on. said element, an oiset disc on said element, a bushing on said arm in which the second mentioned disc is journaled, and a fastening passing loosely through the arm and connected to the second mentioned disc, means to hold the bushing against turning relatively to the arm.

5. In combination with a sander having a power take-01T shaft, an abradant-carrying arm, means pivoting the arm to the sander, an eccentric element, means to attach said element to said shaft, said element having a counterweight disc, an offset bearing disc attached to the rst disc, a bushing carried by the arm against movement relatively thereto, the second mentioned disc being journaled in the bushing, and a securing element passing loosely through the arm into the second mentioned disc.

LEWIS R. SWANK.