Patent JPS51939A successfully refreshed from Google Patents.
Patent US3904245A successfully refreshed from Google Patents.
US3904245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for cutting recess in concrete by impact
Assignee: SHERIFF OF JUDICIAL DISTRICT OF OTTAWA-CARLTON
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Filing: 1973-10-11
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Granted: 1975-09-09
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Expires: 1993-10-11
Abstract
Abstract A machine for cutting a recess of a predetermined size and contour in a concrete road comprises a frame, a first carriage reciprocable in one direction on the frame, a second carriage reciprocable on the first carriage in a different direction, and a power driven hammer unit mounted on the second carriage and arranged to reciprocate a cutting member into engagement with the road and impart a succession of impact blows to the road. The two carriages are reciprocated in a pattern arranged so that the hammer unit traverses over the whole area to be cut away. An anchoring device for securing the machine to the road has a metal plate formed with a peripheral skirt, two concentric rubber rings bonded to the underside of the base plate and projecting below the skirt, and means for withdrawing air from the space surrounded by the inner ring. When the device is placed on a road and air is extracted from the chamber enclosed by the inner ring, the base plate and the road surface, the difference between the pressure of air in the chamber and atmospheric pressure clamps the device to the road. The machine can be used to repair concrete roads by cutting away defective concrete to form a recess which can be plugged by a preformed block of concrete bonded in position by a synthetic resin adhesive.
Inventors
- 👤 Ronald A W Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:09
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/09; E01C23/0906; E01C23/0926; B; B28; B28D; B28D1/00; B28D1/26; B28D1/265
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
254 words
A machine for cutting a recess of a predetermined size and contour in the top surface of a concrete road, comprising a main frame adapted to be mounted on the road to be cut, said frame having means defining a first track thereon, a first carriage movable along said first track, said first carriage having means defining a second track thereon extending in a different direction from that of the first track, a second carriage movable along said second track, a power driver hammer unit coupled to the second carriage for movement therewith and having cutting means adapted to engage the road surface, the hammer unit being operable to impart through the cutting means a succession of impact blows to the road, first drive means operable to reciprocate the first carriage along said first track, stop means restricting movement of the first carriage along said first track to a distance corresponding to one dimension of the desired recess, second drive means operable to reciprocate the second carriage along said second track, further stop means restricting movement of the second carriage along said second track to a distance corresponding to another dimension of the desired recess, and control means adapted to regulate operation of the first and second drive means automatically in a plurality of successive cycles, in each of which the carriages reciprocate in a predetermined sequence arranged to cause the cutting means to traverse over the total area defined by the range of movement of the two carriages determined by said stop means.
Claim 2
Dependent Claim
254 words
A machine for cutting a recess of a predetermined size and contour in the top surface of a concrete road, comprising a main frame adapted to be mounted on the road to be cut, said frame having means defining a first track thereon, a first carriage movable along said first track, said first carriage having means defining a second track thereon extending in a different direction from that of the first track, a second carriage movable along said second track, a power driver hammer unit coupled to the second carriage for movement therewith and having cutting means adapted to engage the road surface, the hammer unit being operable to impart through the cutting means a succession of impact blows to the road, first drive means operable to reciprocate the first carriage along said first track, stop means restricting movement of the first carriage along said first track to a distance corresponding to one dimension of the desired recess, second drive means operable to reciprocate the second carriage along said second track, further stop means restricting movement of the second carriage along said second track to a distance corresponding to another dimension of the desired recess, and control means adapted to regulate operation of the first and second drive means automatically in a plurality of successive cycles, in each of which the carriages reciprocate in a predetermined sequence arranged to cause the cutting means to traverse over the total area defined by the range of movement of the two carriages determined by said stop means.
Claim 3
Dependent Claim
49 words
A machine as claimed in claim 1, wherein the control means are operable to move the cutting means along paths which extend along the periphery of the area defined by the range of movement of the carriages so that the recess cut in the concrete has clearly defined edges.
Claim 4
Dependent Claim
29 words
A machine as claimed in claim 1 and adapted to cut substantially rectangular recesses in a road, wherein said first and second tracks are substantially perpendicular to one another.
Claim 5
Dependent Claim
60 words
A machine as claimed in claim 1 and adapted to cut part-circular recesses in a Road wherein the said first carriage is pivotally connected to the frame for annular movement about a vertical axis, said first track being arcuate and coaxial with said vertical axis, and said second track extends in a substantially radial direction relative to said vertical axis.
Claim 6
Dependent Claim
29 words
A machine as claimed in claim 1, wherein the hammer unit is mounted in vertical guides on the second carriage and rests on the road surface to be cut.
Claim 7
Dependent Claim
33 words
A machine as claimed in claim 1, wherein said drive means comprise piston and cylinder units, the ends of the cylinders co-operating with the pistons to form said stop means for the carriages.
Claim 8
Dependent Claim
52 words
A machine as claimed in claim 1, wherein said hammer unit comprises a cylinder, a piston, and means for reciprocating the piston in the cylinder, and said cutting means are rigidly secured to the piston for axial movement therewith, the piston and cutting means being free to rotate relative to the cylinder.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |