Patent US3572853A successfully refreshed from Google Patents.
US3572853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock bit mounting assembly
Assignee: LAWRENCE Manufacturing CO
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Filing: 1969-03-12
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Granted: 1971-03-30
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Expires: 1989-03-12
Abstract
Abstract A mounting assembly in which a rock bit is retained on a member, together with others thereof, by a two-piece locking plate and in which easy removal of the plate demounts the bit. The bit is rotatable on a shaft, and the shaft has a splined section which interlocks with a splined section of the hub of the bit. This splining prevents the hub from rotation on the shaft in the event the bearings freeze up.
Inventors
- 👤 William D Coski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:54
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A mounting assembly for a rock bit, comprising: a cutter head; a shaft extending from said cutter head; a rock bit rotatably mounted on said shaft; said shaft having a relieved area formed therein, which defines an annular recess, for engaging bit retainer means; a lock plate in engagement with said recess; means restraining said lock plate in position wherein said lock plate comprises a plurality of segments facilitating emplacement of said plate in engagement with said recess wherein each of said segments have rectilinear notches formed therein in which to receive a tool for prying said segments out of said recess.
Claim 2
Dependent Claim
102 words
A mounting assembly for a rock bit, comprising: a cutter head; a shaft extending from said cutter head; a rock bit rotatably mounted on said shaft; said shaft having a relieved area formed therein, which defines an annular recess, for engaging bit retainer means; a lock plate in engagement with said recess; means restraining said lock plate in position wherein said lock plate comprises a plurality of segments facilitating emplacement of said plate in engagement with said recess wherein each of said segments have rectilinear notches formed therein in which to receive a tool for prying said segments out of said recess.
Claim 3
Dependent Claim
48 words
The invention, according to claim 1, wherein: said recess has a given radius; said lock plate has arcuate surfaces of said given radius in engagement with said recess; and said restraining means comprises a lockwasher having tang means extending perpendicularly therefrom in overlying engagement with said lock plate.
Claim 4
Dependent Claim
28 words
The invention, according to claim 1, wherein: said shaft has a portion thereof which projects beyond said rock bit; and said relieved area is formed in said portion.
Claim 5
Dependent Claim
21 words
The invention, according to claim 1, wherein, said lock plate comprises a pair of segments interfacingly arranged in said relieved area.
Claim 6
Dependent Claim
46 words
The invention, according to claim 1, wherein, said restraining means comprises a lockwasher disposed between said bit and said lock plate having a plurality of tangs turned therefrom and overlying outer surfaces of said segments to restrain said segments in interfacing arrangement in said relieved area.
Claim 7
Dependent Claim
26 words
The invention, according to claim 1, wherein: said rock bit has a hub; and said hub and said shaft have means cooperative for preventing rotation therebetween.
Claim 8
Dependent Claim
21 words
The invention, according to claim 6, wherein, said rotation-preventing means comprise means for preventing rotation of said hub on said shaft.
Claim 9
Dependent Claim
22 words
The inveNtion, according to claim 6, wherein, said rotation-preventing means comprise splining formed on and about said shaft and within said hub.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |