Sanding pad

March 18, 1947. a. g. decker 2,417,680

SANDING PAD

Original Filed Dec. 31, 1941

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GLitoway

Patented Mar. 18, 1947

2,417,680

UNITED STATES PATENT OFFICE

2,417,680

SANDING PAD

Alonzo G. Decker, Baltimore' Countjr, Md., assignor to The Black and Decker Manufacturing Company, a corporation of Maryland

Original application December 31, 1941, Serial No. 425,181, now Patent No. 2,350,098, dated May 30, 1944. Divided and this application April 28, 1944, Serial No. 533,158

Claims.

This application is a. division of copending application 425,181, filed December 31, 1941, which has since matured into Patent No. 2,350,098, May 30, 1944. The invention relates to sanding pads for use with a reciprocating sander head which is part of a manually supported and directed power driven tool, more particularly, an electric tool though other power sources may be employed.

The pad of the invention supports a small piece of sand paper or emery cloth or other abrasive surface, giving the effect of an abrasive sheet pressed by two fingers against the parts which are being sanded, and moved back and forth, by oscillation of the fingers. To this extent the operation simulates the hand-sanding operation.

Figures 1 and 2 are vertical sectional views of sanding pads of this invention and of their mountings.

As already pointed out the sander heads of the invention are particularly adapted to the performance of sanding operations where rotary sanders cannot be used, as in. grooves and corners and other confined areas and elsewhere under circumstances in which- sheets of abrasive material have previously been applied by the pressure of one or more fingers of the hand which fingers are moved with a reciprocating, or rubbing motion.

Referring to Figs. 1 and 2, the pad in the form here shown is of the rectangular shape, elongated transversely to the length of the arm. of the sander and to the corresponding radius.· of the sander shaft though this precise form and size are unimportant except that all the pads used with the machines disclosed in the parent application are preferably of. the small size indicated, providing for the use of a small motor to drive them, which motor is suitable to the one hand-control unit disclosed, the pads likewise being suitable to the operation described. These modifications are like those shown in Figs. 18 and 19 of the parent application.

Figs. 1 and 2 show forms of pad and pad-supports particularly adapted for use with the construction, Figs. 1, 9 and 12, of the parent application, being preferably rectangular. Fig. 1, for example, shows the shank 200 depending from the follower member as per Fig. 1 of the parent application. This shank is threaded at 20 ί to engage a lock nut 203 and internally threaded at 204 to receive a flat headed screw 205. The pad proper 206 is apertured at the center to pass over the screw-threaded shank 200.

CI. 51—189)

In assembling the pad on the shank 200, the nut 203 is first turned up slightly above the position: shown in the drawing,, plate or washer 207 is then passed up over the shank into contact ; with the nut, the pad 206 is then engaged with the shank and passed upwardly against the washer and the screw 205 is inserted and turned upwardly to a position shown to support the pad, the head of the same engaging the bottom of 0 the pad. An abrasive sheet 208 is then placed in position to cover the bottom of the pad and the ends of the sheet at 209 are turned upwardly over the ends of the pad and over the top of the pad, after which the washer 207 having been pre5 vicusly raised to admit the ends 209 of the abrasive sheet is forced downwardly against said pad by turning nut 203 downwardly whereby said ends

209 are clamped and the abrasive sheet is secured in position and is thus made ready for any of the sanding operations mentioned, the pad likewise being suitably clamped.

In the construction, Fig. 2, the depending shank

210 of the follower is made of reduced cross-section and preferably solid, being externally thread- ed as shown. In this construction the pad 206 is mounted on a sleeve 211 which is part of the pad member and is externally and also internally threaded and preferably flanged at its lower end at 212. to support the pad. This sleeve carries θ threaded thereon above- the pad, a lock nut or pressure nut 203 and a washer 207, as described above in connection with Fig. 1, and beneath the washer there may be a flexible backing 214. The pads, in all- instances, may be of felt or rubber 5 sponge, or the like.

In this instance the abrasive sheet 215 is placed in- registration with the bottom surface of the pad, completely covering the same, as in·, the previous instance, i. e. in Fig. 1, and the ends 0 216 of the sheet- are passed upwardly over the ends of the pad, and then folded over the top of the same between the top surface of the pad and said plate 214. To clamp the ends of the pad to hold the latter in operative position, the ³ nut 233 is screwed down against the washer 207 and thus applies pressure to the plate 214 clamping the ends of the abrasive sheet in position and holding the latter in its operative relation to the pad. If desired, the flexible plate or sheet 0 214 may be omitted, the washer 207, in most instances, being of a diameter approaching or equal to the transverse dimension of the pad so that it is sufficient to hold the ends of the sheet when pressed down by the nut 203.

I have thus described the invention in two dif2,417,680 ferent forms, the description being specific and in detail in order that the manner of constructing, applying, operating and using the invention may be fully understood, however, the specific terms herein are used descriptively rather than in a limiting sense, the scope of the invention being defined in the claims.