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US 5,319,888 AGranted
Random orbital sander
AssigneeDynabrade, Inc.
InventorsPaul W. Huber, David G. Heckmiller, Jr.
Life of this patent
Estimating the term…
Abstract
There is disclosed in connection with a random orbital sander the utilization of improved arrangements for resiliently supporting an air motor, controlling the flow of pressurized air to the motor, and utilizing air exhausted from the motor to withdraw dust from a shroud arranged to collect dust generated incident to operation of the sander. Also disclosed is an alternative dust collecting arrangement, wherein the shroud is connected by a sander mounted duct to a source of vacuum.
Claims26
A sander comprising in combination:
- a housing defining a chamber having a side wall, an inner end and an open outer end, and an air supply and air exhaust passageways communicating with said chamber at points spaced annularly of said side wall intermediate said ends;
- an air motor disposed within said chamber and having a motor casing and a rotor rotatably supported within said casing, said casing having opposite ends, a side wall and air inlet and exhaust ports spaced annularly of said side wall thereby and arranged intermediate said opposite ends thereof;
- a sanding head;
- means for coupling said sanding head to said rotor for imparting sanding movement to said sanding head in response to rotational movements of said rotor;
- and
- mounting means for non-rotatably mounting said casing within said chamber to arrange said air inlet and exhaust ports for flow communication with said air supply and air discharge passageways, respectively, said mounting means including resiliently deformable means having mounting portions encircling said opposite ends of said casing and extending radially between said side wall of said casing and said side wall of said chamber adjacent said inner and outer ends of said chamber and a pair of intermediate sealing portions extending between said mounting portions in engagement with said side walls of said chamber and said casing and being spaced apart annularly of said side wall of said casing to fluid seal said air inlet port and said air supply passageway from said air discharge port and said air discharge passageway.
3 more elements
A sander according to claim wherein said sander additionally includes valve means having:
- a valve chamber defined by said housing and arranged to divide said air supply passageway into an inlet flow path and an outlet flow path communicating with said valve chamber;
- a valve seat arranged in one of said inlet and outlet flow paths;
- a valve sleeve supported for rotation within said valve chamber and having a through opening provided with opposite ends arranged for placing said flow paths in flow communication;
- a valve member having sealing and operating ends, said sealing end being arranged within said one of said flow paths for removable engagement with said valve seat for selectively blocking and unblocking flow of air through said one of said flow paths, said operating end extending into said valve chamber from said one of said flow paths and through one of said opposite ends of s id through opening for receipt within said valve sleeve;
- an operator supported by said valve sleeve for engagement with said operating end of said valve member within said through opening and being movable relative to said valve sleeve to effect movement of said valve member for removably engaging said sealing end with said valve seat to selectively block and unblock flow of air through said one of said flow paths, said through opening including said one of said opposite ends thereof being sized and shaped to permit said movement of said valve member and rotation of said valve sleeve within said valve chamber between first and second limits, and another of said opposite ends of said through opening cooperating with another of said flow paths to form a rotary valve for varying flow of air between said through opening and said other of said flow paths incident to rotation of said valve sleeve between said limits.
2 more elements
Dependencies are inferred from the claim text.