Patent US4102955A successfully refreshed from Google Patents.
US4542943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earthworking tool for protecting from abnormally high cutting loads
Assignee: Kennametal PC Inc
•
Filing: 1985-04-03
•
Granted: 1985-09-24
•
Expires: 2005-04-03
Abstract
Abstract There is disclosed a base and block assembly for use with an earthworking bit. The assembly comprises a base and a block engaged in the base. The block has a shank portion and a toolholder portion extending from a first end of the shank and adapted for receiving the earthworking bit. The assembly also comprises means for causing the block to preferentially fail when exposed to abnormally high cutting loads. Also disclosed is a method for protecting the base of a base and block assembly when in use with an earthworking bit. The method comprises preferentially weakening the block so as to cause the block to fail when exposed to abnormally high cutting loads and engaging the block with the base.
Inventors
- 👤 Robert H. Montgomery, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:44
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; E21B10/633; E02; E02F; E02F9/00; E02F9/28; E02F9/2866; E21C; E21C35/00; E21C35/18; E21C35/19; E21C35/191; E21C35/193; Y; Y10; Y10T; Y10T407/00; Y10T407/13; Y10T407/28
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
109 words
An assembly for use with an earthworking bit, comprising: a base having a T-shaped recess formed by the intersection of a vertical slot and a horizontal slot; a block engaging said base, said block having a shank portion and a toolholder portion extending from a first end of said shank and adapted for receiving an earthworking bit; said block having a T-shaped portion extending from a second end of said shank portion with said T-shaped portion slidably engaging said groove; and said shank having means for causing said block to preferentially fail when exposed to abnormally high cutter loads and located between said toolholder portion and said T-shaped portion.
Claim 2
Dependent Claim
109 words
An assembly for use with an earthworking bit, comprising: a base having a T-shaped recess formed by the intersection of a vertical slot and a horizontal slot; a block engaging said base, said block having a shank portion and a toolholder portion extending from a first end of said shank and adapted for receiving an earthworking bit; said block having a T-shaped portion extending from a second end of said shank portion with said T-shaped portion slidably engaging said groove; and said shank having means for causing said block to preferentially fail when exposed to abnormally high cutter loads and located between said toolholder portion and said T-shaped portion.
Claim 3
Dependent Claim
31 words
The assembly of claim 1 wherein said failure means comprises a segment of said shank portion in which the cross section area is reduced from the remainder of the shank portion.
Claim 4
Dependent Claim
25 words
The assembly of claim 2 wherein said reduced cross area segment comprises a groove situated along at least one peripheral surface of said shank portion.
Claim 5
Dependent Claim
81 words
The assembly of claim 1 wherein the base further comprises a top portion of two intersecting surfaces, each of said top portion surfaces inclined to the horizontal; and the block further comprises a bottom portion of two intersecting surfaces extending outwardly from the first end of said shank portion, each of said bottom portion surfaces inclined to the horizontal, said top portion surfaces of said base directly opposing said bottom portion surfaces of said block when said block engages said base.
Claim 6
Dependent Claim
35 words
The assembly of claim 4 wherein the angle that each of said top portion surfaces of base and each of said bottom portion surfaces of said block makes with the horizontal is about ten degrees.
Claim 7
Dependent Claim
70 words
The assembly of claim 4 wherein said horizontal slot and top portion surfaces of said base diverge from one another toward the rear of said base and said T-shaped portion and bottom portion surfaces of said block diverge in a similar manner from one another toward the rear of said block, said base and block becoming wedgingly engaged due to said divergence as said block moves rearwardly in said base.
Claim 8
Dependent Claim
17 words
The assembly of claim 1 further comprising means for retaining the base and block in immovable engagement.
Claim 9
Dependent Claim
58 words
The assembly of claim 7 wherein said retaining means comprises: fastening means; a threaded recess in the rear of said shank portion; and a perforation in the rear of said T-shaped recess, said perforation and threaded recess being in alignment when said block engages said base, said fastening means passing through said perforation and engaging said threaded recess.
Claim 10
Dependent Claim
21 words
The assembly of claim 1 wherein said means for preferential failure comprises a recess in the rear of said shank portion.
Claim 11
Dependent Claim
87 words
A block for use with an earthworking bit, comprising: a shank portion; a toolholder portion extending from a first end of said shank and adapted for receiving an earthworking bit; said block having a T-shaped portion extending from the second end of said shank portion, said T-shaped portion adapted for slidable engagement with a groove in a base member; and said shank having means for causing said block to preferentially fail when exposed to abnormally high cutting loads located between said toolholder portion and said T-shaped portion.
Claim 12
Dependent Claim
87 words
A block for use with an earthworking bit, comprising: a shank portion; a toolholder portion extending from a first end of said shank and adapted for receiving an earthworking bit; said block having a T-shaped portion extending from the second end of said shank portion, said T-shaped portion adapted for slidable engagement with a groove in a base member; and said shank having means for causing said block to preferentially fail when exposed to abnormally high cutting loads located between said toolholder portion and said T-shaped portion.
Claim 13
Dependent Claim
31 words
The block of claim 10 wherein said failure means comprises a segment of said shank portion in which the cross section area is reduced from the remainder of the shank portion.
Claim 14
Dependent Claim
26 words
The block of claim 11 wherein said reduced cross section area segment comprises a groove situated along at least one peripheral surface of said shank portion.
Claim 15
Dependent Claim
34 words
The block of claim 12 further comprising a bottom portion of two intersecting surfaces extending outwardly from the first end of said shank portion, each of said bottom portion surfaces inclined to the horizontal.
Claim 16
Dependent Claim
23 words
The block of claim 13 wherein the angle that each of said bottom portion surfaces makes with the horizontal is about ten degrees.
Claim 17
Dependent Claim
23 words
The block of claim 13 wherein said T-shaped portion and bottom portion surfaces diverge from one another toward the rear of said block.
Claim 18
Dependent Claim
19 words
The block of claim 10 wherein said failure means comprises a recess in the rear of said shank portion.
References Cited (Backward Citations)
US2381973A
Cited
US3010744A
Cited
US3498677A
Cited
US3753625A
Cited
US3846030A
Cited
US3820849A
Cited
US4360981A
Cited
US4275929A
Cited
US4261620A
Cited
EP0032428A1
Cited
DE3113147A1
Cited
US4343516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |