US3844494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer mill rotor assembly
Assignee: FERROMET Inc
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Filing: 1973-02-01
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Granted: 1974-10-29
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Expires: 1993-02-01
Abstract
Abstract In a hammer mill having a rotatable shaft with outwardly extending arms mounted to rotate with the shaft, swing hammers are pivotally secured to the outer ends of the arms and off the radial center line of the arms toward the direction of shaft rotation so that each hammer leads the adjacent portion of its respective arm to protect the arm from wear. A replaceable cap is disposed over the leading edge of the arm to further protect it from wear, and a replaceable head is mounted on each hammer so the head can be quickly replaced when worn to maintain hammer weight.
Inventors
- 👤 W Hightower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:54
CPC Classifications
B; B23; B23D; B23D31/00; B23D31/002; B02; B02C; B02C13/00; B02C13/26; B02C13/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
220 words
In a hammer mill having a rotatable shaft, the improvement comprising an elongated rotor arm mounted on the shaft to extend radially from the shaft and rotate with it, a hammer disposed adjacent the outer end of the arm, means for securing the hammer to the arm so the hammer projects beyond the outer end of the arm and ahead of the leading edge of the arm when the shaft is rotated, the hammer including separate head and body portions which overlap in the direction of shaft rotation and each have collinear holes extending through them in the direction substantially parallel to the axis of shaft rotation, and a retaining pin extending through the collinear holes in the overlapping portions of the hammer head and body to secure them together, the pin being positioned so that when the shaft is rotated the pin is prevented from movement along its axis by the adjacent motor arms between which the hammer is secured, the location of the retaining pin with respect to the pivot point for the hammer being such that when the shaft does not rotate and the hammer is rotated about its pivot point, the pin moves clear of the rotor arms so it can be moved longitudinally to permit the hammer head to be removed from the hammer body.
Claim 2
Dependent Claim
220 words
In a hammer mill having a rotatable shaft, the improvement comprising an elongated rotor arm mounted on the shaft to extend radially from the shaft and rotate with it, a hammer disposed adjacent the outer end of the arm, means for securing the hammer to the arm so the hammer projects beyond the outer end of the arm and ahead of the leading edge of the arm when the shaft is rotated, the hammer including separate head and body portions which overlap in the direction of shaft rotation and each have collinear holes extending through them in the direction substantially parallel to the axis of shaft rotation, and a retaining pin extending through the collinear holes in the overlapping portions of the hammer head and body to secure them together, the pin being positioned so that when the shaft is rotated the pin is prevented from movement along its axis by the adjacent motor arms between which the hammer is secured, the location of the retaining pin with respect to the pivot point for the hammer being such that when the shaft does not rotate and the hammer is rotated about its pivot point, the pin moves clear of the rotor arms so it can be moved longitudinally to permit the hammer head to be removed from the hammer body.
Claim 3
Dependent Claim
52 words
A hammer mill having a rotatable shaft, an elongated rotor arm mounted on the shaft to extend radially from the shaft and rotate with it, a hammer mounted on the outer end of the arm, and a replaceable shoe secured over the leading edge of the rotor arm and its outer end.
Claim 4
Dependent Claim
52 words
A hammer mill having a rotatable shaft, an elongated rotor arm mounted on the shaft to extend radially from the shaft and rotate with it, a hammer mounted on the outer end of the arm, and a replaceable shoe secured over the leading edge of the rotor arm and its outer end.
Claim 5
Dependent Claim
55 words
Apparatus according to claim 2 in which the arm includes a hole extending in the same general direction as the shaft, and the shoe includes an inwardly extending portion with a hole collinear with the hole In the arm, and a retaining pin extending through the collinear holes to secure the shoe to the arm.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 2 in which the shoe covers the leading edge and adjacent sides of the rotor arm at its outer end.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |