US5082403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core-drilling apparatus with mandrel driver-ejector
Assignee: Individual
•
Filing: 1991-04-22
•
Granted: 1992-01-21
•
Expires: 2011-04-22
Abstract
Abstract In one embodiment, the bodies of the mandrel and the drill have radially opposing portions thereof which are threadedly engaged about the axis of the drill. Through bores in the respective body portions make it possible to latch the drill to the mandrel for the drilling operation, using a pin that is inserted through the bores, and then when the drilling operation is completed, withdrawn from the bores to enable the core of work material to be ejected from the drill by advancing the mandrel on the threading while the drill is restrained against rotation. In other embodiments, the bodies of the mandrel and the drill have axially opposing portions thereof which are equipped with raised steps on the axially opposing faces thereof. The steps enable the drill to be latched to the mandrel for the drilling operation by engaging the faces of the body portions with one another so that the steps abut in one axial plane of the drill. Afterward, the body portions are retracted from one another to enable the mandrel to be used in ejecting the core of the work material as described.
Inventors
- 👤 James L. Sutton
- 👤 Stephen H. Van Valkenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0453; B23B2260/00; B23B2260/138; Y; Y10; Y10S; Y10S408/00; Y10S408/703; Y10T; Y10T408/00; Y10T408/50; Y10T408/51; Y10T408/89; Y10T408/895; Y10T408/896; Y10T408/8973
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
699 words
In a core drilling apparatus to be equipped with a pilot drill in use, a mandrel body which is elongated and has opposed ends with one of said ends adapted to be rotatably coupled to a rotary drive means and a longitudinally extending externally threaded portion intermediate said distal ends and the other of said distal ends defining a driver surface and means for securing said pilot drill to said other end so that the pilot drill projects from said driver surface, a core drill body having an axis of rotation and opposed ends and a hole therethrough which is centered on the axis of rotation and opening at said opposing ends of the drill body, a first portion of the hole opening at one of said ends and having internal threads, and a second portion of the hole opening at the other of said ends of the drill body, a circular cutting edge provided at said other end about said other end opening, said second portion having a diameter which is radially enlarged relative to the first portion to enable the second portion of the hole to receive a core of work material cut by the cutting edge, the externally threaded portion of the mandrel body being threaded into the internally threaded first portion of the hole, latch means for providing a positive rotatable coupling between the bodies of the mandrel and the core drill for performing a cutting operation, and alternatively, releasing the positive rotatable coupling for permitting threaded movement of the mandrel body in the core drill body for ejection of the cut core from the hole, said latch means including a first and second abutment means each having a coupling surface extending along parallels to a plane coinciding with the longitudinal axis of the mandrel body, between points spaced apart from one another in the plane axially of the mandrel body, and an abutment surface extending in a plane transverse the longitudinal axis of the mandrel body at a point operatively offset from the coupling surface of the respective first or second abutment means axially of the mandrel body, means for rotatably coupling and axially fixing the first abutment means to one of the mandrel body and the core drill body, means mounting the second abutment means on the other of said mandrel body and said core drill body for axial movement on said other body between a first position in which the respective coupling surfaces and abutment surfaces of the first and second abutment means are aligned with one another and abutted with one another respectively, in planes coinciding with and transverse the axis of the mandrel body, respectively, and a second position in which the respective abutment surfaces of the first and second abutment means are operatively disengaged and spaced apart from one another axially of said other body, and means whereby the coupling surfaces of the first and second abutment means are interengageable with one another when the second abutment means are moved axially on said other body to the first position thereof, to positively couple the bodies of the mandrel and the core drill, and the respective first and second abutment means, for rotation in unison with one another about the longitudinal axis of the mandrel body for the cutting operation, and alternatively, disengageable from one another when the second abutment means are moved axially on said other body to the second position thereof, to permit the mandrel body to be threadedly moved in the core drill body for the ejection operation, the driver surface being recessed in the second portion of the hole, relative to said other end of the core drill body, when the second abutment means are in the first position thereof, and the length of said threaded portion and the distance between said first and second positions of the second abutment means being of sufficient lengths to enable the mandrel body to be threadedly moved in the core drill body to an ejection position in which the driver surface is substantially coplanar with a plane defined by said cutting edge when the second abutment means are moved axially on said other body to the second position thereof.
Claim 2
Dependent Claim
699 words
In a core drilling apparatus to be equipped with a pilot drill in use, a mandrel body which is elongated and has opposed ends with one of said ends adapted to be rotatably coupled to a rotary drive means and a longitudinally extending externally threaded portion intermediate said distal ends and the other of said distal ends defining a driver surface and means for securing said pilot drill to said other end so that the pilot drill projects from said driver surface, a core drill body having an axis of rotation and opposed ends and a hole therethrough which is centered on the axis of rotation and opening at said opposing ends of the drill body, a first portion of the hole opening at one of said ends and having internal threads, and a second portion of the hole opening at the other of said ends of the drill body, a circular cutting edge provided at said other end about said other end opening, said second portion having a diameter which is radially enlarged relative to the first portion to enable the second portion of the hole to receive a core of work material cut by the cutting edge, the externally threaded portion of the mandrel body being threaded into the internally threaded first portion of the hole, latch means for providing a positive rotatable coupling between the bodies of the mandrel and the core drill for performing a cutting operation, and alternatively, releasing the positive rotatable coupling for permitting threaded movement of the mandrel body in the core drill body for ejection of the cut core from the hole, said latch means including a first and second abutment means each having a coupling surface extending along parallels to a plane coinciding with the longitudinal axis of the mandrel body, between points spaced apart from one another in the plane axially of the mandrel body, and an abutment surface extending in a plane transverse the longitudinal axis of the mandrel body at a point operatively offset from the coupling surface of the respective first or second abutment means axially of the mandrel body, means for rotatably coupling and axially fixing the first abutment means to one of the mandrel body and the core drill body, means mounting the second abutment means on the other of said mandrel body and said core drill body for axial movement on said other body between a first position in which the respective coupling surfaces and abutment surfaces of the first and second abutment means are aligned with one another and abutted with one another respectively, in planes coinciding with and transverse the axis of the mandrel body, respectively, and a second position in which the respective abutment surfaces of the first and second abutment means are operatively disengaged and spaced apart from one another axially of said other body, and means whereby the coupling surfaces of the first and second abutment means are interengageable with one another when the second abutment means are moved axially on said other body to the first position thereof, to positively couple the bodies of the mandrel and the core drill, and the respective first and second abutment means, for rotation in unison with one another about the longitudinal axis of the mandrel body for the cutting operation, and alternatively, disengageable from one another when the second abutment means are moved axially on said other body to the second position thereof, to permit the mandrel body to be threadedly moved in the core drill body for the ejection operation, the driver surface being recessed in the second portion of the hole, relative to said other end of the core drill body, when the second abutment means are in the first position thereof, and the length of said threaded portion and the distance between said first and second positions of the second abutment means being of sufficient lengths to enable the mandrel body to be threadedly moved in the core drill body to an ejection position in which the driver surface is substantially coplanar with a plane defined by said cutting edge when the second abutment means are moved axially on said other body to the second position thereof.
Claim 3
Dependent Claim
107 words
The core drilling apparatus according to claim 1 wherein one of the first and second abutment means has a socket therein whose center line is disposed in a plane coinciding with the longitudinal axis of the mandrel body, and the other of the first and second abutment means has a pin thereon whose center line is disposed in a plane coinciding with the longitudinal axis of the mandrel body, and wherein the pin and socket are retractably interengageable with one another at the outer and inner peripheral surfaces thereof, respectively, when the second abutment means are moved axially on said other body to the first position thereof.
Claim 4
Dependent Claim
40 words
The core drilling apparatus according to claim 2 wherein the pin and socket extend along radii of the mandrel body axis at the center lines thereof, and are retractably interengageable with one another when the radii coincide with one another.
Claim 5
Dependent Claim
124 words
The core drilling apparatus according to claim 2 wherein the first and second abutment means have annular faces thereon which are relatively opposed to one another radially of the mandrel body axis when the second abutment means are moved axially on said other body, and wherein the socket is recessed in one of the first and second abutment means to extend along a radius of the mandrel body axis at the center line thereof, and the pin is operatively reciprocably engaged in the other of the first and second abutment means to be retractably inserted into the socket along the aforesaid radius of the mandrel body axis when the second abutment means are moved axially on said other body to the first position thereof.
Claim 6
Dependent Claim
116 words
The core drilling apparatus according to claim 1 wherein the first and second abutment means are disposed on the bodies of the core drill and the mandrel, respectively, adjacent the transition between the first and second portions of the hole through the core drill body, and the other end of the mandrel body, respectively, and wherein the first and second abutment means also have annular faces thereon which are relatively opposed to one another lengthwise of the mandrel body axis when the second abutment means are moved axially on the mandrel body, and are operable to abut one another when the second abutment means are moved axially on the mandrel body to the first position thereof.
Claim 7
Dependent Claim
143 words
The core drilling apparatus according to claim 1 wherein the first and second abutment means have annular faces thereon which are relatively opposed to one another lengthwise of the mandrel body axis when the second abutment means are moved axially on said other body, and are operable to abut one another when the second abutment means are moved axially on said other body to the first position thereof, and wherein the annular faces of the first and second abutment means have said coupling surfaces thereon and said coupling surfaces extend respectively between axially spaced apart points of a plane coinciding with the longitudinal axis of the mandrel body, and are relatively raised on and recessed in the respective faces to be retractably interengageable with one another when the second abutment means are moved axially on said other body to the first position thereof.
Claim 8
Dependent Claim
34 words
The core drilling apparatus according to claim 6 wherein the coupling surfaces extend along radii of the mandrel body axis and are retractably interengageable with one another when the radii coincide with one another.
Claim 9
Dependent Claim
25 words
The core drilling apparatus according to claim 1 wherein the second abutment means take the form of a flange on the body of the mandrel.
Claim 10
Dependent Claim
185 words
The core drilling apparatus according to claim 8 wherein the flange is engaged on the externally threaded portion of the mandrel body, to be shifted in relation to the mandrel body, axially thereof, and in relation to the core drill body at the one end thereof, and wherein the flange and the one end of the core drill body have annular faces thereon which are relatively opposed to one another lengthwise of the mandrel body axis when the flange is moved axially on the mandrel body, and are operable to abut one another when the flange is moved axially on the mandrel body to the first position thereof, and wherein the annular faces of the flange and the one end of the mandrel body have said coupling surfaces thereon and said coupling surfaces extend respectively between axially spaced apart points of a plane coinciding with the longitudinal axis of the mandrel body, and are relatively raised on and recessed in the respective faces to be retractably interengageable with one another when the flange is moved axially on the mandrel body to the first position thereof.
Claim 11
Dependent Claim
79 words
The core drilling apparatus according to claim 9 wherein the flange is telescopically engaged on the externally threaded portion of the mandrel body, to be slideably shifted in relation to the mandrel body, axially thereof, but keyed to the mandrel body to maintain a predetermined angular orientation about the mandrel body axis, and wherein the coupling surfaces extend along radii of the mandrel body axis and are retractably engaged with one another when the radii coincide with one another.
Claim 12
Dependent Claim
32 words
The core drilling apparatus according to claim 10 further comprising means for maintaining the flange in the second position thereof during threaded movement of the mandrel body in the core drill body.
Claim 13
Dependent Claim
218 words
The core drilling apparatus according to claim 6 wherein the flange is disposed on the other end of the mandrel body, to be shifted in relation to the core drill body at the transition between the first and second portions of the hole through the core drill body, and wherein the flange and the transition have annular faces thereon which are relatively opposed to one another lengthwise of the mandrel body axis when the flange is moved axially on the mandrel body, and are operable to abut one another when the flange is moved axially on the mandrel body to the first position thereof, and wherein the annular faces of the flange and the transition have said coupling surfaces thereon and said coupling surfaces extend respectively between axially spaced apart points of a plane coinciding with the longitudinal axis of the mandrel body, and are relatively raised on and recessed in the respective faces to be retractably interengageable with one another when the flange is moved axially on the mandrel body to the first position thereof, the faces of the flange and the transition being helical and the threading of the mandrel and the core drill bodies being adapted to abut the surfaces with one another when the faces of the flange and the transition abut one another.
Claim 14
Dependent Claim
678 words
A core drilling apparatus comprising: a mandrel body which is elongated and has opposed ends with one of said ends adapted to be rotatably coupled to a rotary drive means and a longitudinally extending externally threaded portion intermediate said distal ends and the other of said distal ends defining a driver surface and a pilot drill means projecting from said driver surface, a core drill body having an axis of rotation and opposed ends and a hole therethrough which is centered on the axis of rotation and opening at said opposing ends of the drill body, a first portion of the hole opening at one of said ends and having internal threads, and a second portion of the hole opening at the other of said ends of the drill body, a circular cutting edge provided at said other end about said other end opening, said second portion having a diameter which is radially enlarged relative to the first portion to enable the second portion of the hole to receive a core of work material cut by the cutting edge, the externally threaded portion of the mandrel body being threaded into the internally threaded first portion of the hole, latch means for providing a positive rotatable coupling between the bodies of the mandrel and the core drill for performing a cutting operation, and alternatively, releasing the positive rotatable coupling for permitting threaded movement of the mandrel body in the core drill body for ejection of the cut core from the hole, said latch means including a first and second abutment means each having a coupling surface extending along parallel to a plane coinciding with the longitudinal axis of the mandrel body, between points spaced apart from one another in the plane axially of the mandrel body, and an abutment surface extending in a plane transverse the longitudinal axis of the mandrel body at a point operatively offset from the coupling surface of the respective first or second abutment means axially of the mandrel body, means for rotatably coupling and axially fixing the first abutment means to one of the mandrel body and the core drill body, means mounting the second abutment means on the other of said mandrel body and said core drill body for axial movement on said other body between a first position in which the respective coupling surfaces and abutment surfaces of the first and second abutment means are aligned with one another and abutted with one another respectively, in planes coinciding with and transverse the axis of the mandrel body, respectively, and a second position in which the respective abutment surfaces of the first and second abutment means are operatively disengaged and spaced apart from one another axially of said other body, means whereby the coupling surfaces of the first and second abutment means are interengageable with one another when the second abutment means are moved axially on said other body to the first position thereof, to positively couple the bodies of the mandrel and the core drill, and the respective first and second abutment means, for rotation in unison with one another about the longitudinal axis of the mandrel body for the cutting operation, and alteratively, disengageable from one another when the second abutment means are moved axially on said other body to the second position thereof, to permit the mandrel body to be threadedly moved in the core drill body for the ejection operation, the driver surface being released in the second portion of the hole, relative to said other end of the core drill body, when the second abutment means are in the first position thereof, and the length of said threaded portion and the distance between said first and second positions of the second abutment means being of sufficient lengths to enable the mandrel body to be threadedly moved in the core drill body to an ejection position in which the driver surface is substantially coplanar with a plane defined by said cutting edge when the second abutment means rae moved axially on said other body to the second position thereof.
Claim 15
Dependent Claim
678 words
A core drilling apparatus comprising: a mandrel body which is elongated and has opposed ends with one of said ends adapted to be rotatably coupled to a rotary drive means and a longitudinally extending externally threaded portion intermediate said distal ends and the other of said distal ends defining a driver surface and a pilot drill means projecting from said driver surface, a core drill body having an axis of rotation and opposed ends and a hole therethrough which is centered on the axis of rotation and opening at said opposing ends of the drill body, a first portion of the hole opening at one of said ends and having internal threads, and a second portion of the hole opening at the other of said ends of the drill body, a circular cutting edge provided at said other end about said other end opening, said second portion having a diameter which is radially enlarged relative to the first portion to enable the second portion of the hole to receive a core of work material cut by the cutting edge, the externally threaded portion of the mandrel body being threaded into the internally threaded first portion of the hole, latch means for providing a positive rotatable coupling between the bodies of the mandrel and the core drill for performing a cutting operation, and alternatively, releasing the positive rotatable coupling for permitting threaded movement of the mandrel body in the core drill body for ejection of the cut core from the hole, said latch means including a first and second abutment means each having a coupling surface extending along parallel to a plane coinciding with the longitudinal axis of the mandrel body, between points spaced apart from one another in the plane axially of the mandrel body, and an abutment surface extending in a plane transverse the longitudinal axis of the mandrel body at a point operatively offset from the coupling surface of the respective first or second abutment means axially of the mandrel body, means for rotatably coupling and axially fixing the first abutment means to one of the mandrel body and the core drill body, means mounting the second abutment means on the other of said mandrel body and said core drill body for axial movement on said other body between a first position in which the respective coupling surfaces and abutment surfaces of the first and second abutment means are aligned with one another and abutted with one another respectively, in planes coinciding with and transverse the axis of the mandrel body, respectively, and a second position in which the respective abutment surfaces of the first and second abutment means are operatively disengaged and spaced apart from one another axially of said other body, means whereby the coupling surfaces of the first and second abutment means are interengageable with one another when the second abutment means are moved axially on said other body to the first position thereof, to positively couple the bodies of the mandrel and the core drill, and the respective first and second abutment means, for rotation in unison with one another about the longitudinal axis of the mandrel body for the cutting operation, and alteratively, disengageable from one another when the second abutment means are moved axially on said other body to the second position thereof, to permit the mandrel body to be threadedly moved in the core drill body for the ejection operation, the driver surface being released in the second portion of the hole, relative to said other end of the core drill body, when the second abutment means are in the first position thereof, and the length of said threaded portion and the distance between said first and second positions of the second abutment means being of sufficient lengths to enable the mandrel body to be threadedly moved in the core drill body to an ejection position in which the driver surface is substantially coplanar with a plane defined by said cutting edge when the second abutment means rae moved axially on said other body to the second position thereof.
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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) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |