US2889667A

US2889667A - Sanding pad

Info

Publication number: US2889667A
Application number: US745908A
Authority: US
Inventors: Bert J Campbell
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-07-01
Filing date: 1958-07-01
Publication date: 1959-06-09
Anticipated expiration: 1976-06-09

Description

June 9, 1959 B. J. CAMPBELL 2, 67

SANDING PAD Filed July 1, 1958 l2 ,8 Fig.3

Berf J. Campbell lN VEN TOR.

United States Patent SANDING PAD Bert J. Campbell, Hollister, Mo. Application July 1, 1958, Serial No. 745,908 2 Claims. (Cl. 51-186) The present invention generally relates to a sanding pad and more particularly to a hand pad useful in combination with a piece of abrasive paper so that the abrasive paper may be effectively moved by hand over a surface to be sanded.

There have been many sanding pads of a manual nature provided but these devices all incorporate various structural arrangements for attaching the abrasive paper to the pad. This attachment generally eliminated the utility of a part of the abrasive paper since the edges thereof are clamped in slots or otherwise not used. With previous devices provided in this field of endeavor, considerable time would be consumed in renewing the abrasive paper due to the necessity of mounting the paper to the pad. In view of these objections, it is the primary object of the present invention to provide a sanding pad which is engaged directly with a folded piece of abrasive paper which has been folded with an abrasive surface facing upwardly and downwardly so that the friction of the pad with the abrasive paper will cause the abrasive paper to be moved over a surface to be sanded or abraded while the pad simultaneously acts to clear the surface of the abrasive paper engaged thereby due to a slight suction or cleaning action provided by alternating pressure being exerted on the pad.

Another object of the present invention is to provide a sanding pad which is extremely simple in operation, efficient in use, light in weight, and also provides for elimination of cutting predetermined sizes of abrasive sheets to fit the device, elimination of mounting ends or side edges of abrasive paper under flaps, elimination of waste of abrasive paper and generally providing a manual sanding pad, easy on the hands and generally inexpensive to manufacture.

These together with objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a perspective view of the sanding pad and abrasive paper used in conjunction therewith;

Figure 2 is a perspective view showing the abrasive sheets and the manner of folding the same; and

Figure 3 is an end elevation of the abrasive paper and the sanding pad.

Referring now specifically to the drawings, the numeral 10 generally designates the sanding pad and the numeral 12 designates the abrasive paper which is divided into three

equal panels

14, 16 and 18 with the abrasive surface thereof disposed outwardly.

The sand pad is constructed of wool felt and is 5 inch thick, three inches wide and 5 /2 inches long and weighs approximately one ounce. The entire peripheral surface of the block of wool felt is continuous and is provided with no slits, pins or the like to hold abrasive paper in position. The abrasive sheet 12 is one-half of a standard 9 inch by ll inch abrasive sheet thus making a sheet Patented June 9, 1959 5% inches by 9 inches which is folded into

equal panels

14, 16 and 18 with each panel forming a three inch by five and one-half inch area which is equal to the area of the bottom surface of the pad 10. It is noted that an abrasive surface faces upwardly of the panel 14 and downwardly of the panel 16 and the pad 10 is placed on the upper surface of the upper panel 14 and by placing the hand flat on the pad with heel of hand at one end of pad and the tips of the fingers slightly curved over opposite ends of the pad the pad may be manipulated and the abrasive on the panel 14 will prevent relative slipping between the sheet of abrasive material 12 and the pad 10 so that the abrasive panel 16 may be used in sanding a surface in the usual manner.

When the abrasive surface of the panel 16 has become clogged from sanding, it is only necessary to lift the pad 10 away from the sheet of sanding material 12 and turn over the paper so that the outer surface of the panel 14 faces downwardly and the pad then engages the abrasive surface of the panel 16. During subsequent manipulation of the sanding pad, the felt pad 10 will clean the clogged abrasive surface of panel 16 due to a suction action caused by manipulating the pad back and forth over the surface to be sanded which provides an alternating pressure and release of the felt pad 10 which creates a partial suction for lifting or removing the particles from the abrasive surface. When these surfaces are worn, it is only necessary then to change the position of

panels

14 and 18, that is let panel 14 be the intermediate panel and the panel 18 be the uppermost panel so that this panel 18 may be used as the sanding surface.

Thus, with this invention, the entire abrasive surface of a sheet of abrasive paper is effectively used with there being no waste and with there being no time consumed in measuring an exact size of abrasive paper and cutting the same to exactly fit and further eliminating the time consumed in mounting the paper on the backing block and the time consumed in cleaning the paper. Thus, with the present invention, the abrasive paper is automatically held in place by the slight pressure exerted on the pad and on the paper while sanding. Also, the pad 10 automatically cleans one side of the abrasive paper while sanding with the other side. With this sand pad, an operator can thoroughly sand under the edges of the moldings of automobiles or the like and substantially the entire surface area of an automobile may be sanded by using this pad. It is quite prevalent in persons engaged in the sanding of automobiles to have considerable wear and damage occur to their fingers due to the heaviness and large size. This device substantially eliminates this problem and is extremely maneuverable and facilitates the cleaning and changing of the paper. This device may be used for either wet or dry sanding and will efiectively sand over rounded or curved surfaces as well as flat surfaces.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A sand pad assembly comprising a generally rectangular block of wool felt material having a planar lower surface, a folded sheet of abrasive material having an abrasive surface facing upwardly and downwardly with the upwardly facing abrasive surface engaging the lower surface of the block and preventing relative movement therebetween whereby the lower surface of the abrasive paper may be employed for sanding a surface.

v 2. The combination of claim 1 wherein the area of the abrasive surfaces is equal whereby the folded sheet of abrasive paper may be inverted after the initial lower abrasive surface has-been clogged whereby the subsequent sanding operation will clean the clogged abrasive surface due to alternating pressure and release of pressure being applied on the block thus creating a suction on the clogged abrasive surface for removing the material therefrom.

References Cited in the file of this patent UNITED STATES PATENTS Coffin Jan. 20, 1883 Laughton Apr. 8, 1884 Dubey Apr. 7, 1891 Simons July 12, 1927 Crosby Dec. 6, 1949 Zasadny et a1. Aug. 22, 1950