Patent US4643764A successfully refreshed from Google Patents.
Patent US3854899A successfully refreshed from Google Patents.
US3854899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic mold cleaning
Assignee: Amsted Industries Inc
•
Filing: 1973-06-04
•
Granted: 1974-12-17
•
Expires: 1993-06-04
Abstract
Abstract Graphite molds are provided with a refractory coating which must be removed and renewed between each pour. An apparatus and method are provided for sand blasting the coated mold surfaces under controlled conditions to remove the refractory coating without eroding the graphite mold.
Inventors
- 👤 A Germain
- 👤 W Dressel
- 👤 L Sandor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:12
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C3/00; B24C3/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A method of removing a foreign material from the surface of a graphite mold, comprising the steps of: suspending a sand spray gun from a universal joint over the axis of the mold with the lower end of the gun spaced from the mold; then dropping sand through an inner gun passage and forcing air through an outer gun passage so that sand is forcefully ejected against the mold surface, while simultaneously moving the lower end of the gun in a spiral path toward the periphery of the mold, the rate of speed of the circular component of said path being constant and the rate of speed of the radial component of said path being at a decreasing rate.
Claim 2
Independent Claim
119 words
A method of removing a foreign material from the surface of a graphite mold, comprising the steps of: suspending a sand spray gun from a universal joint over the axis of the mold with the lower end of the gun spaced from the mold; then dropping sand through an inner gun passage and forcing air through an outer gun passage so that sand is forcefully ejected against the mold surface, while simultaneously moving the lower end of the gun in a spiral path toward the periphery of the mold, the rate of speed of the circular component of said path being constant and the rate of speed of the radial component of said path being at a decreasing rate.
Claim 3
Dependent Claim
38 words
A method according to claim 1, and including the step of increasing the air pressure and thereby the sand velocity as the lower end of the gun moves from the axis to the outer periphery of the mold.
Claim 4
Dependent Claim
19 words
A method according to claim 1, wherein the sand is silica and of about 135 to 150 A.F.S. fineness.
Claim 5
Independent Claim
99 words
A method of removing a mold coating from the casting surface of a graphite mold, comprising the steps of: suspending a sand spray gun on the axis of the mold and spaced from the mold, and then, while forcing sand through the spray gun and against the mold surface, moving the spray gun in a spiral path toward the periphery of the mold, the rate of outward radial motion of the gun decreasing substantially proportionally to the increase in distance from the mold axis so that approximately equal areas of the mold are cleaned in equal increments of time.
Claim 6
Independent Claim
99 words
A method of removing a mold coating from the casting surface of a graphite mold, comprising the steps of: suspending a sand spray gun on the axis of the mold and spaced from the mold, and then, while forcing sand through the spray gun and against the mold surface, moving the spray gun in a spiral path toward the periphery of the mold, the rate of outward radial motion of the gun decreasing substantially proportionally to the increase in distance from the mold axis so that approximately equal areas of the mold are cleaned in equal increments of time.
Claim 7
Dependent Claim
145 words
Sand blasting apparatus comprising, a frame; a sand blasting gun having its upper end suspended from the frame for universal pivotal movement; a first means for moving the lower end of said gun in a radial direction; and a second means for simultaneously moving the lower end of said gun in a rotary path so that the combined motions cause the lower end of the gun to move in a spiral path, said first means comprising a rotatable shaft movable with said gun in radial direction; a crank secured to the shaft for rotation therewith; a cam wheel at the outer end of the crank; a cam plate immovable in a direction radially of said gun; said cam wheel being movable, upon rotation of said shaft, along the cam plate to force said shaft and said gun radially outward at a decreasing rate of speed.
Claim 8
Dependent Claim
145 words
Sand blasting apparatus comprising, a frame; a sand blasting gun having its upper end suspended from the frame for universal pivotal movement; a first means for moving the lower end of said gun in a radial direction; and a second means for simultaneously moving the lower end of said gun in a rotary path so that the combined motions cause the lower end of the gun to move in a spiral path, said first means comprising a rotatable shaft movable with said gun in radial direction; a crank secured to the shaft for rotation therewith; a cam wheel at the outer end of the crank; a cam plate immovable in a direction radially of said gun; said cam wheel being movable, upon rotation of said shaft, along the cam plate to force said shaft and said gun radially outward at a decreasing rate of speed.
Claim 9
Dependent Claim
98 words
Sand blasting apparatus according to claim 5 wherein said first means includes a bearing block rotatably mounted on the gun below the pivotal axis thereof; a gear box secured to said block for rotation therewith; a sprocket secured to the gear box input shaft; a sprocket nonrotatably secured to the gun; a chain interconnecting said sprockets; an output shaft on the gear box; a cam bar secured to the output shaft for rotation therewith; a cam wheel carried by the cam bar; and an angularly disposed cam plate engageable by the cam wheel as the output shaft rotates.
Claim 10
Dependent Claim
97 words
Sand blasting apparatus according to claim 5 wherein said second means comprising a pair of guide wheels rotatably mounted on opposite sides of said block for rotation therewith, the axis of each wheel being disposed to pass through the pivotal axis of the gun; a rotatable drive assembly carried by the frame and positioned concentric with the gun and below said bearing block; spaced parallel guide plates secured to the upper portion of said drive assembly for rotation therewith; said guide plates straddling said guide wheels and being engageable therewith; and means for rotating said drive assembly.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |