US2064483A

US2064483A - Sanding machine

Info

Publication number: US2064483A
Application number: US45563A
Authority: US
Inventors: Albert G Mccaleb
Original assignee: Duro Metal Products Co
Current assignee: Duro Metal Products Co
Priority date: 1935-10-18
Filing date: 1935-10-18
Publication date: 1936-12-15
Anticipated expiration: 1953-12-15

Description

15, l"935 A. G. MCCALE'B 2,064,483

SANDING MACHINE l Dec. 15, 19,36. A, G MCCALEB 2,064,483

` SANDING MACHINE Filed Oct. 18, 1955 2 Sheets-Sheet 2 Patented Dee. 15, 193ev PATENT OFFICEk vsriNmNo. MACHINE Albert G. McCaleb, Evanston, Ill., assigner` to Duro Metal Products Company, Chicago, Ill., a corporation of Illinois Application October. 18, 1935, Serial No. 45,563

3 Claims.

, My invention relates to sanding machines and is particularly concerned with improvements in sanding machines of the type characterized by an abrading element in the form of a power driven l belt. The principal object of the invention is to provide a sanding machine of the aforementioned type in which the belt runs on a roller that has adequate bearings at both ends, although no part of the machine lies laterally outside of one of the edges of the belt tocontact with asurface at right angles to the surface upon which the lower run of the belt is operating.

No sanding machine ofthe. prior art, to my know1edge,fpresents all of the'foregoing features 16 in combination, although all l are desiderata.

Patent4 to Emmons No. 1,821,624, for example,

discloses a sander which exhibits all of the aforef said desiderata, except the provision of bearings at both ends of the belt rollers.v Patent to Gustafson et al. No. 949,181, disclosesy a machine which also exhibits some of said desiderata.

Both Emmons and Gustafson yet al., however,

found it necessary to employ rollers, each supportedonly at one of its ends, in' order to keep any part ofthe machine from projecting laterally beyond that edge of the belt which is intendedto lie and movek immediatelyadjacent to a surface normal to the one on which the belt is operating. k l v The present invention, in one of its aspects, may be said to consist in the provision of a sanding machine comprising a rollerv driven belt, on the lower run'of which the-weight of the machine is carried, in which all parts of the machine frame and. the bearings for the rollers lie wholly to one side of one of' the edges of the belt notwithstanding that each roller is providedwith adequate bearings at both ends thereof, in contradistincrtion to those vsanding machines of the prior art wherein the problem of locating all parts of the machine frame andbearings on one side of one of the edges of the belthas beenpartially compromised, byl the dubiousand undesirable expedient of deprivingeach roller of support at one of g5-.its ends.

beyond which no othery part of the sanding machine should project.`

While I have chosen to illustrate the improvements of the present invention as incorporated 55 in` a sanding machine of the type that is driven Y -A salientfeature ofthe present invention is the from a separate motor through the agency of a flexible shaft, I wish to have it understood that the improvements of the present invention are equally applicable to machines that are wholly self-contained in the sense that they carry their own motors. Other features, objects and advantages of the invention are apparent from the following detailed description, wherein reference is made to the accompanying two sheets of drawings, showing a preferred form of sanding machine.

Fig. 1 of the drawings is a perspective view of the sanding machine showing a driving motor and flexible shaft connected therewith;

Fig. 2 is a side elevational view thereof;

Fig. 3 is a Vhorizontal sectional view, taken on the line 3--3 of Fig. 2;

Fig. 4 is a vertical sectional view, on an enlarged scale, taken on theline 4 4 of Fig. 2;

Fig. 5 is a vertical sectional View on a similar scale, taken on the line 5--5 of Fig. 2;

Fig. 6 is a fragmentary horizontal sectional view, taken on the line 6 6 of Fig. 2, and` Fig. `7 is an elevational view of the bearing bracket for the adjustable roller.

These specific drawings and the specific description that follows merely disclose an illustrative embodiment of the invention and are not to impose limitations upon the claims.

All the metal parts of the sanding machine, with the exception of the bolts, screws, shafts and bearings, are preferably cast vfrom an aluminum alloy so that the device may be cheaply constructed,l and of light weight. The frame II of the machine may be open at the front and the bottom and at one side, with a closed top I2 and side I3. At the rear of the frame or housing II maybe provided 'an enlarged portion having a flat top I4 and closed rear end I5 to which are attached the legs I6 and I1 of the handle I8 of the machine. The rear end of the frame is conveniently concaved to accommodate the operators hand as it grasps the handle, and a second 'lll handle I9y shaped like a door knobV may be screwed to the top member I2 of the frame for the other hand of the operator.

Means may be provided at the front of the side member I3 ofthe frame for supporting one end of aroller. Thus, the side member I3 may vhave a boss20 with a bore in which is fixed a bearing 2I of `any suitable bearing metal. In this bearing is journaled the end 22 of a shaft having a knurled portion 23 to receive a roller 24 with a drive fit. 'Ihe frame also carries means for rotatably mounting the other end of the roller, having a support for the part of a sanding belt running on the roller that extends past the end ofthe roller. In the device illustrated, the shaft upon which the roller is mounted has its other end 2l journaled in a bearing 26 xed in a bore in an arcuate shoe 21, which is formed at the end of a web 28 integral with the side member I3. A shoe is preferable to a roller for supporting the overlapping part of the belt. because a shoe can be made to extend close to the outer edge of the main roller,

while a roller used in place of a shoe would have to be spaced from the main roller to provide room for a support between the two rollers to carry their bearings.

lThe other roller of the machine is preferably supported by a bracket that is adjustable relatively to the frame. For mounting the adjustable bracket, there may be inserted in a pair of bores, in the shoulder 23 at the front of the 'enlarged rear portion of the frame, two bolts 30 that have headless ends fixed by means of set screws 3i in bores in the upper arm 32 of the adjustable bracket. In order that the bracket may be freely adjustable, the bores in the shoulder 29 are made slightly larger than the bolts, and a tapped hole is provided between the bores to receive a screw bolt 33 whose end bears .against the upper arm 32 of the adjustable bracket. To adjust the tension of a belt running on the two rollers by moving the bracket forward or backward the nuts on the bolts 30 are screwed up. or the screw bolt 33 is screwed in. The bracket can also be tilted slightly to cause the axis of its supported roller to tilt ina horizontal plane, 'by screwing up the nut on one bolt more than on the other. In this manner the belt can be maderto run to one side or the other. l

Depending from the upper arm 32 of the adjustable bracket may be a leg 34 at the end of which is formed a boss 35 having a bore containing a bearing y36 of any suitable bearing metal. This bearing receives the end 31 of a shaft having a knurled portion 33 for the securing of a roller 39 similar to the roller 24. The roller 39 is preferably provided with a support for its other end' that is similar to the support for the corresponding end of the roller 24, except that it is integral with the adjustable bracket rather than with the frame. To support this end of the roller the shaft may have its end 40 journaled in a bearing 4| xed in a bore in an arcuate shoe 42 formed on the end of an arm 43 that extends around the roller from the depending leg 34 of the bracket. The roller may be driven by a flexible shaft 44 threaded into the end 31 of the'roller shaft, the threads running in the direction in which the shaft is to be rotated. The flexible shaft 44 is provided with a cover' 45 and is driven by a motor 46.

Also included in the device may bea means for supporting the frame upon the lower run of the belt that passes over the rollers, such as a shoe 41 extending nearly the whole distance between the rollers. Supporting the sanding machine upon the shoe is conveniently carried out by provision of a hollow boss 43 onthe top of the shoe, into which is driven a heavy pin 43 that is fixed by means of a set screw I! in an ear Il extending inward from the side member I3. To retard conduction of heat generated by the friction of the belt against the work, the shoe 41 is covered -with one or more loyers 52 of heat-insulating material, such as cork. These layers may in turn be covered with a friction reducing apron 53 of sheet steel having a flangev I4, which is screwed to the shoe to hold the apron 33 in place, and which is separated from the apron by means of a flexible crease that permits the apron to adjust itself to the work. Around the shoe and the rollers is wrapped a belt 56 of flexible abrasive material such as emery cloth or sand paper. The shoe is adjusted to cause the belt to project downward to a slight extent between the rollers so that a fiat work engaging surface is presented. In order that all parts of the machine may lie wholly inside the plane of the edge of the belt, the shoe and rollers should extend no farther outward than the belt edge. The frame preferably does not even extend as far out as the belt (see Figure 4). The rollers 24 ond 39 may have a slight crown opposite the middle of the belt to keep the belt from running olf to one side and may be covered with resilient rubber tubes 58 that grip the roller surfaces and provide antislip engagement with the interior of the belt.

The rsanding machine that has been described may be modified, and various other devices em- --bodying the substance of the invention may be constructed, to meet various requirements.

Having thus described my invention, I claim: l. In a sanding machineI in combination, a

frame, a drive roller and an idle roller, eachhaving one `end rotatably supported by the frame, a

sanding belt on the rollers extending past their other ends, means for supporting the frame upon the lower run of the belt, and an arcuate shoe carried by the frame for supporting the part of the belt that overlaps each roller having means for rotatably supporting the other end of the roller and lying inside the plane of the edge of the belt.

' 2. In a sanding machine, in combination, a frame, a drive roller and an idle roller, each having one end rotatably supported by the frame, a sanding belt on the rollers extending past their other ends, means for supporting the frame upon the lower run of the belt, and an arcuate shoe carried by the framefor supporting the part of the belt that overlaps each roller having means for rotatably supporting the other end of the roller and lying inside the plane of the edge of the belt, the arcuate shoe carrying the drive roller being adjustably mounted on the frame for tensioning the sanding belt on the rollers.

3. In a sanding machine, in combination, a frame. a. drive roller and an idle roller, each of said rollers having both of its ends supported by the frame, an endless sanding belt on the rollers, said belt ,overlapping corresponding ends of the rollers and extending to a plane, at right angles to the roller axes, beyond which no frame part extends, and auxiliary belt-supporting members at those ends of the rollers which are overlapped by the belt, each said auxiliary belt-supporting member being carried by a frame part which lies between those portions of the belt which extend between the rollers, and each said auxiliary beltsupporting member presenting a curved surface, concentric with the adjacent roller, for engaging and supporting the belt edge which over- .ALBERTV G. MCCALEB.