US3653239A — Centrifugal blast wheel

Claim 1

Independent Claim 186 words

A centrifugal blast wheel for projecting peening particles comprising a runnerhead, a plurality of particle throwing vanes radially mounted on said runnerhead, the heels of said vanes being spaced from each other whereby a central area of said runnerhead is free from said vanes, an impeller case mounted adjacent said runnerhead in said central area disposed adjacent said heels of said vanes, a slot in the wall of said case, an impeller in said case, said impeller having peripheral blades closely disposed adjacent to said case, feed means for feeding particles into said case whereby the particles will be discharged between adjacent blades through said slot and against said vanes, and means for preventing particles from being trapped between said impeller blades and said slot of said case, said impeller case having a horizontal axis, said slot having a trailing edge wall which includes an inner edge disposed toward said impeller and an outer edge disposed toward said vanes and each of said inner edge and said outer edge being slanted with respect to the horizontal axis and coming to a point at its rearmost position.

Claim 2

Dependent Claim 186 words

A centrifugal blast wheel for projecting peening particles comprising a runnerhead, a plurality of particle throwing vanes radially mounted on said runnerhead, the heels of said vanes being spaced from each other whereby a central area of said runnerhead is free from said vanes, an impeller case mounted adjacent said runnerhead in said central area disposed adjacent said heels of said vanes, a slot in the wall of said case, an impeller in said case, said impeller having peripheral blades closely disposed adjacent to said case, feed means for feeding particles into said case whereby the particles will be discharged between adjacent blades through said slot and against said vanes, and means for preventing particles from being trapped between said impeller blades and said slot of said case, said impeller case having a horizontal axis, said slot having a trailing edge wall which includes an inner edge disposed toward said impeller and an outer edge disposed toward said vanes and each of said inner edge and said outer edge being slanted with respect to the horizontal axis and coming to a point at its rearmost position.

Claim 3

Dependent Claim 143 words

A centrifugal blast wheel for projecting peening particles comprising a runnerhead, a plurality of particle throwing vanes radially mounted on said runnerhead, the heels of said vanes being spaced from each other whereby a central area of said runnerhead is free from said vanes, an impeller case mounted adjacent said runnerhead in said central area disposed adjacent said heels of said vanes, a slot in the wall of said case, an impeller in said case, said impeller having peripheral blades closely disposed adjacent to said case, feed means for feeding particles into said case whereby the particles will be discharged between adjacent blades through said slot and against said vanes, and means for preventing particles from being trapped between said impeller blades and said slot of said case, and said means for preventing particles from being trapped including a baffle in said impeller.

Claim 4

Dependent Claim 143 words

A centrifugal blast wheel for projecting peening particles comprising a runnerhead, a plurality of particle throwing vanes radially mounted on said runnerhead, the heels of said vanes being spaced from each other whereby a central area of said runnerhead is free from said vanes, an impeller case mounted adjacent said runnerhead in said central area disposed adjacent said heels of said vanes, a slot in the wall of said case, an impeller in said case, said impeller having peripheral blades closely disposed adjacent to said case, feed means for feeding particles into said case whereby the particles will be discharged between adjacent blades through said slot and against said vanes, and means for preventing particles from being trapped between said impeller blades and said slot of said case, and said means for preventing particles from being trapped including a baffle in said impeller.

Claim 5

Dependent Claim 30 words

A centrifugal blast wheel as set forth in claim 2 wherein said slot includes a trailing edge which is slanted aNd comes to a point at the rearmost portion thereof.

Claim 6

Dependent Claim 52 words

A centrifugal blast wheel as set forth in claim 3 wherein each of said blades includes a groove extending completely thereacross in its outer surface, all of the grooves in said blades being coarcuate with the arc disposed at the same distance away from said runnerhead as said point in said slot.

Claim 7

Dependent Claim 38 words

A centrifugal blast wheel as set forth in claim 4 wherein said baffle is stationary with respect to said case, said baffle being an angle shaped member having divergent sides which shield said trailing edge of said slot.

Claim 8

Dependent Claim 35 words

A centrifugal blast wheel as set forth in claim 5 wherein said trailing edge is arrowhead shaped with its apex being said point, and said point being at approximately the center of said trailing edge.

Claim 9

Dependent Claim 24 words

A centrifugal blast wheel as set forth in claim 6 wherein said slot has a forward edge which is parallel to said trailing edge.

Claim 10

Dependent Claim 26 words

A centrifugal blast wheel as set forth in claim 6 wherein said slot has a forward edge which is the mirror image of said trailing edge.

Claim 11

Dependent Claim 66 words

A centrifugal blast wheel as set forth in claim 6 wherein said baffle is an angle member having an apex and a pair of sides, said apex being at the center of said impeller and said sides extending to said blades, and said blades extending to substantially as high as the height of said slot and whereby said baffle shields said trailing edge of said slot.

Claim 12

Dependent Claim 100 words

An impeller case for use in a centrifugal blast wheel comprising a cylindrical body with a horizontal axis for receiving an impeller therein, one end of said body being open for receiving a feed spout, an enlarged axial slot being in the side wall of said body with said side wall being otherwise imperforate, said slot having a trailing edge wall, said trailing edge wall having an inner edge and an outer edge, and each of said inner edge and said outer edge being slanted with respect to the horizontal axis and coming to a point at its rearmost position.

Claim 13

Dependent Claim 100 words

An impeller case for use in a centrifugal blast wheel comprising a cylindrical body with a horizontal axis for receiving an impeller therein, one end of said body being open for receiving a feed spout, an enlarged axial slot being in the side wall of said body with said side wall being otherwise imperforate, said slot having a trailing edge wall, said trailing edge wall having an inner edge and an outer edge, and each of said inner edge and said outer edge being slanted with respect to the horizontal axis and coming to a point at its rearmost position.

Claim 14

Dependent Claim 46 words

An impeller case as set forth in claim 10 wherein said trailing edge is arrowhead shaped with its apex being said point and being at about the center of said edge, and said slot having a forward edge which is substantially parallel to said trailing edge.

Claim 15

Dependent Claim 48 words

An impeller case as set forth in claim 10 wherein said trailing edge is arrowhead shaped with its apex being said point and being at about the center of said edge, and said slot having a forward edge which is substantially the mirror image of said trailing edge.

Claim 16

Dependent Claim 79 words

An impeller for use in a centrifugal blast wheel comprising a cylindrical body, fastening means at one end for securing said body to a blast wheel runnerhead, the other end of said body being open for receiving blast particles therein, the side of said body being in skeletal form with a plurality of equally spaced longitudinal blades forming said skeletal form, a groove extending completely across the outer surface of each blade, and all of said grooves being coarcuate.

Claim 17

Dependent Claim 79 words

An impeller for use in a centrifugal blast wheel comprising a cylindrical body, fastening means at one end for securing said body to a blast wheel runnerhead, the other end of said body being open for receiving blast particles therein, the side of said body being in skeletal form with a plurality of equally spaced longitudinal blades forming said skeletal form, a groove extending completely across the outer surface of each blade, and all of said grooves being coarcuate.

Claim 18

Dependent Claim 187 words

A baffle for use in an impeller having a floor in a centrifugal blast wheel comprising an angle shaped frontal member having a pair of sides joined at an apex to define a substantially right angle therebetween, an angle shaped backing member secured to said frontal member and disposed within said right angle formed by said frontal member sides, said backing member being at the same angle as said frontal member whereby said backing member and said frontal member fit snugly against each other, said sides of said frontal member being wider than said sides of said backing member and being of sufficient width whereby said sides are juxtaposed the blades in an impeller when said apex of said frontal member is disposed at the center of the impeller, said sides of said frontal member extending below said sides of said backing member for resting upon the floor of an impeller, and said sides of said backing member extending beyond said sides of said frontal member to present a surface for securement to a stationary body whereby said Baffle will remain stationary when the impeller is rotating.

Claim 19

Dependent Claim 187 words

A baffle for use in an impeller having a floor in a centrifugal blast wheel comprising an angle shaped frontal member having a pair of sides joined at an apex to define a substantially right angle therebetween, an angle shaped backing member secured to said frontal member and disposed within said right angle formed by said frontal member sides, said backing member being at the same angle as said frontal member whereby said backing member and said frontal member fit snugly against each other, said sides of said frontal member being wider than said sides of said backing member and being of sufficient width whereby said sides are juxtaposed the blades in an impeller when said apex of said frontal member is disposed at the center of the impeller, said sides of said frontal member extending below said sides of said backing member for resting upon the floor of an impeller, and said sides of said backing member extending beyond said sides of said frontal member to present a surface for securement to a stationary body whereby said Baffle will remain stationary when the impeller is rotating.

Claim 20

Dependent Claim 181 words

In a method for peen forming aircraft skin sections including feeding peening balls into a centrifugal blast wheel having radial vanes and an impeller which is mounted within a slotted case, the diameter of the peening balls being larger than the clearance between the impeller and the impeller case, preventing balls from being trapped between the forward edge of the slot in the impeller case and the blades of the impeller by deflecting some balls off a stationary baffle within the impeller to prevent balls from rebounding from the interior of the impeller directly to the trailing edge of the slot and by forming the trailing edge of the slot with a slanted wall which terminates in a point disposed over an annular groove formed by grooves in the outer surface of the impeller blades with the distance between the impeller case and the base of the groove being large enough to hold a ball so that balls deflected from the heel of a vane to the trailing edge would ride down the slanted trailing edge and fall into the groove.

Claim 21

Dependent Claim 181 words

In a method for peen forming aircraft skin sections including feeding peening balls into a centrifugal blast wheel having radial vanes and an impeller which is mounted within a slotted case, the diameter of the peening balls being larger than the clearance between the impeller and the impeller case, preventing balls from being trapped between the forward edge of the slot in the impeller case and the blades of the impeller by deflecting some balls off a stationary baffle within the impeller to prevent balls from rebounding from the interior of the impeller directly to the trailing edge of the slot and by forming the trailing edge of the slot with a slanted wall which terminates in a point disposed over an annular groove formed by grooves in the outer surface of the impeller blades with the distance between the impeller case and the base of the groove being large enough to hold a ball so that balls deflected from the heel of a vane to the trailing edge would ride down the slanted trailing edge and fall into the groove.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-04-04	1975-10-04	1976-04-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-04-04	1979-10-04	1980-04-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-04-04	1983-10-04	1984-04-04	$7700.00	Window Closed / Lapsed

Centrifugal blast wheel

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