US3841709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excavating tool arrangement
Assignee: Kennametal Inc
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Filing: 1973-05-07
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Granted: 1974-10-15
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Expires: 1993-05-07
Abstract
Abstract An excavating tool arrangement including a bit having a cylindrical shank received in a correspondingly shaped hole in a support block with the forward end of the bit protruding forwardly from the block and being substantially rectangular when viewed from above and greater in width from side to side than in heighth from top to bottom. The bit is keyed to the block in a predetermined oriented position and the leading edge of the working end of the block may be chisel shaped or may be provided with hard wear resistant inserts mounted therein. The described bit may be employed alone for excavating operations or it may be employed in combination with other bits which are symmetrical about a longitudinal axis and terminate in points and which are mounted in blocks that may be identical with the blocks supporting the first mentioned excavating bit.
Inventors
- 👤 T Kniff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:33
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
240 words
In an excavating tool; a support block having a bottom surface and a forward face and a rearward face, a round bore extending through the block and intersecting both of said faces and diverging from said bottom surface in the forward direction, said block being adapted for mounting on a driver for driving said block in a direction parallel to said bottom surface, a bit having a shank portion which is round in cross section and slidably fitted in the bore in the block, said bit having a forward working portion extending forwardly from the forward face of the block and substantially coaxial with said shank portion, said working portion being generally rectangular when viewed in plane and also when viewed in cross section perpendicular to the axis of said shank with a greater dimension parallel to said bottom surface of said block and a smaller dimension, said working portion having cutting means at the free end distributed thereon in the direction of the said greater dimension, cooperating elements of key means on said bit and said block operable to locate said bit in a rotated portion in said block and to hold said bit in said rotated position during working operations, and cooperating elements of abutment means on said bit and block to sustain working loads imposed on said bit when the bit and block are driven into a formation by the driver on which the block is mounted.
Claim 2
Dependent Claim
240 words
In an excavating tool; a support block having a bottom surface and a forward face and a rearward face, a round bore extending through the block and intersecting both of said faces and diverging from said bottom surface in the forward direction, said block being adapted for mounting on a driver for driving said block in a direction parallel to said bottom surface, a bit having a shank portion which is round in cross section and slidably fitted in the bore in the block, said bit having a forward working portion extending forwardly from the forward face of the block and substantially coaxial with said shank portion, said working portion being generally rectangular when viewed in plane and also when viewed in cross section perpendicular to the axis of said shank with a greater dimension parallel to said bottom surface of said block and a smaller dimension, said working portion having cutting means at the free end distributed thereon in the direction of the said greater dimension, cooperating elements of key means on said bit and said block operable to locate said bit in a rotated portion in said block and to hold said bit in said rotated position during working operations, and cooperating elements of abutment means on said bit and block to sustain working loads imposed on said bit when the bit and block are driven into a formation by the driver on which the block is mounted.
Claim 3
Dependent Claim
40 words
An excavating tool according to claim 1 in which said key means includes a linear recess formed in at least one of the said faces of said block and intersecting said bore, and means on th bit engaging said recess.
Claim 4
Dependent Claim
51 words
An excavating tool according to claim 2 in which said recess is formed in the rearward faceof said block, said means on the bit comprising a pin extending laterally in the shank of the bit and engaging said recess, said pin also holding said bit in assembled relation with said block.
Claim 5
Dependent Claim
38 words
An excavating tool according to claim 2 in which said recess is displaced radially from the axis of said bore whereby said bit can be keyed to said block only in a predetermined rotated position of said bit.
Claim 6
Dependent Claim
48 words
An excavating tool according to claim 1 in which said abutment means comprise a forwardly facing shoulder formed in said bore in the block and a rearwardly facing shoulder said shank of saiD bit, said shoulder engaging when the bit is seated in the bore in said block.
Claim 7
Dependent Claim
21 words
An excavating tool according to claim 5 in which said shoulders are located about midway along the said bore and shank.
Claim 8
Dependent Claim
109 words
An excavating bit comprising; a rearward shank which is round in cross section and receivable in a round bore in a support block, said bit having a working portion fixed to the forward end of said shank and extending forwardly therefrom, said working portion being generally rectangular in cross section perpendicular to the axis of said shank with a greater dimension and a smaller dimension, cutting means on the free end of said working portion distributed therealong in the direction of said greater dimension, rearward facing abutment means on said bit, and an element of key means on said bit for nonrotatably keying the bit to a support block.
Claim 9
Dependent Claim
109 words
An excavating bit comprising; a rearward shank which is round in cross section and receivable in a round bore in a support block, said bit having a working portion fixed to the forward end of said shank and extending forwardly therefrom, said working portion being generally rectangular in cross section perpendicular to the axis of said shank with a greater dimension and a smaller dimension, cutting means on the free end of said working portion distributed therealong in the direction of said greater dimension, rearward facing abutment means on said bit, and an element of key means on said bit for nonrotatably keying the bit to a support block.
Claim 10
Dependent Claim
28 words
An excavating bit according to claim 7 in which said cutting means comprises a chisel edge formed on the forward end of said working portion of the bit.
Claim 11
Dependent Claim
33 words
An excavating bit according to claim 7 in which said cutting means comprises hard wear resistant rod-like insert means mounted distributed relation in the forward end of said working portion of the bit.
Claim 12
Dependent Claim
34 words
An excavating bit according to claim 7 in which one of the wider faces of said working portion of said bit is substantially flat and the other of the wider faces is longitudinally fluted.
Claim 13
Dependent Claim
33 words
An excavating bit according to claim 7 in which said abutment means is in the form of a rearwardly facing shoulder formed on said shank in about the middle of the length thereof.
Claim 14
Dependent Claim
34 words
An excavating bit according to claim 7 in which said key means are formed on the rearward end of said working portion and protrude rearwardly therefrom on at least one side of said shank.
Claim 15
Dependent Claim
32 words
An excavating bit according to claim 7 in which said key means are formed on the rearward end of said working portion and protrude rearwardly therefrom on both sides of said shank.
Claim 16
Dependent Claim
25 words
An excavating bit according to claim 7 in which said key means are disposed in a plane offset radially from the axis of said shank.
Claim 17
Dependent Claim
61 words
A support block having a bottom surface and forward and rearward faces substantially parallel to each other and a bore extending through said block and said faces and substantially perpendicular to said faces, said bore diverging from said bottom surface toward the forward face of said block, and lateral recess means formed in one of said faces and intersecting said bore.
Claim 18
Dependent Claim
61 words
A support block having a bottom surface and forward and rearward faces substantially parallel to each other and a bore extending through said block and said faces and substantially perpendicular to said faces, said bore diverging from said bottom surface toward the forward face of said block, and lateral recess means formed in one of said faces and intersecting said bore.
Claim 19
Dependent Claim
33 words
A support block according to claim 15 in which said recess means is in the form of a straight slot the axis of which is spaced radially from the axis of said bore.
Claim 20
Dependent Claim
169 words
In an excavating device; a driver member, support blocks mounted on said driver member in distributed relation an each having a forward face and a rearward face, each block having a bore extending therethrough from the forward face to the rearward face to receive from the front the shank of a bit with the bits being driven into a formation by movement of the driver member, each bore diverging from the adjacent surface region of the driver in the forward direction, said bits having working portions projecting forwardly from the respective blocks, said bits and blocks comprising groups thereof, the leading bits of each group being pointed at the forward ends and rotatable in the respective blocks, the trailing bit of each group having a spade-like forward working portion with a sharp forward cutting edge extending laterally to the forward direction of movement of said bits, means for nonrotatably connecting said trailing bits to the respective support blocks, and cooperating elements of abutment means on each bit and block.
Claim 21
Dependent Claim
169 words
In an excavating device; a driver member, support blocks mounted on said driver member in distributed relation an each having a forward face and a rearward face, each block having a bore extending therethrough from the forward face to the rearward face to receive from the front the shank of a bit with the bits being driven into a formation by movement of the driver member, each bore diverging from the adjacent surface region of the driver in the forward direction, said bits having working portions projecting forwardly from the respective blocks, said bits and blocks comprising groups thereof, the leading bits of each group being pointed at the forward ends and rotatable in the respective blocks, the trailing bit of each group having a spade-like forward working portion with a sharp forward cutting edge extending laterally to the forward direction of movement of said bits, means for nonrotatably connecting said trailing bits to the respective support blocks, and cooperating elements of abutment means on each bit and block.
Claim 22
Dependent Claim
31 words
An excavating device according to claim 17 in which said leading bits are laterally inclined so as to diverge from the plane of movement of the bits in the forward direction.
Claim 23
Dependent Claim
59 words
An excavating device according to claim 17 in which the said blocks of each group are substantially identical, and recess means in one of the forward and rearward faces of each said block for use in nonrotatably connecting a said trailing bit thereto whereby each block is adapted to receive either a said leading or a said trailing bit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |