# US 5,707,273 A · Multiple-pad orbital sander with split pad platen

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- Number: US 5,707,273 A
- Document ID: US5707273A
- Status: Granted
- Kind: A
- Application number: 08/615,055
- Filed: 1996-03-13
- Granted: 1998-01-13
- Earliest claimed: 1994-04-28
- Assignees: Timesavers, Inc.
- Inventors: Howard W. Grivna
- Web page: https://patentgrep.com/patent/US5707273A

## CPC

- B24B 7/28: for grinding wood
- B24B 7/12: for grinding travelling elongated stock, e.g. strip-shaped work
- B24B 47/10: for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS

## Abstract

An abrasive, sanding and/or surface finishing apparatus designed to extend the useful life of abrasive material which employs a dual-platen arrangement having a particulate removal system designed to effectively remove particulate from the working area of the machine. Specifically, the particulate removal system is designed to remove particles from the surface of the work in the area of the gap created between the twin platens, with a secondary particulate removal system designed to remove material from the work following treatment by abrasive from both platens. The inlet port of the particulate removal system interposed between the platens is designed to occupy a substantial portion of the area within the gap zone between the platens. In addition to increasing the useful life of the abrasive, the particulate removal system reduces the release or discharge of dust into the ambient.

## Claims

### Claim 1

In combination, a sanding apparatus having a frame, a work conveyor with an endless belt having a work supporting flight for transporting workpieces thereupon from an infeed end to an outfeed end along an axis defining a machine direction, support means coupled to said frame for mounting an abrasive head with work surface treating means thereon for creating and defining a working zone along said work supporting flight, and a particulate removal means for removal of particulate from said working zone; said combination being characterized in that:
(a) said working zone comprises a platen mounting plate with means for mounting a pair of elongated abrasive heads on opposed sides thereof, a pair of generally parallelly disposed elongated abrasive heads mounted on said plate having their elongate axes disposed generally transversely of said machine direction axis and being arranged in spaced apart relationship along said machine direction axis with a gap zone defined between mutually opposed edge surfaces of said abrasive heads, said mounting plate having an opening formed therein and being disposed within said gap zone;
(b) said mounting plate along with said abrasive heads being coupled to motion generating means for simultaneous oscillatory motion of said heads;
(c) said particulate removal means comprising ductwork with an inlet port at one end, an outlet port at the other end, and with said inlet port passing through said mounting plate opening into close proximity with said work supporting flight, said ductwork extending from said inlet port to said outlet port for movement of a flow of air away from said inlet port, and including a flexible conduit to permit said inlet port to move with said mounting plate, said inlet port having a cross-sectional dimension substantially equal to the width of said gap zone and being positioned within said gap zone to move with said mounting plate for direct removal of particulate from that portion of the surface of the workpiece disposed therewithin, and said outlet port being in communication with a separator/collector means for separation of entrained particulate from said flow of air.

### Claim 2 (depends on 1)

The combination as defined in claim 1 being particularly characterized in that means are provided for adjustably positioning each of said abrasive heads with respect to said abrasive head support means.

### Claim 3 (depends on 1)

The combination as defined in claim 1 being particularly characterized in that each of said abrasive heads is coupled to motion generating means for simultaneous oscillatory and reciprocatory motion of said heads, and wherein said reciprocatory motion is transverse to the machine direction axis.

### Claim 4 (depends on 3)

The combination as defined in claim 3 being particularly characterized in that said inlet port includes an inlet manifold means disposed within said ductwork.

### Claim 5 (depends on 4)

The combination as defined in claim 4 wherein a plurality of laterally spaced apart inlet ports extend from said manifold to transversely spaced-apart positions within said gap zone, and wherein said plurality of inlet ports being aligned along an axis parallel to the axis of said reciprocatory motion.

### Claim 6 (depends on 1)

The combination as defined in claim 1 being particularly characterized in that means are provided for adjustably positioning said motion generating means to preserve simultaneous oscillatory motion of said heads .