1. A downhole tool for connection in a work string to be inserted into tubing in a well bore, the tool comprising a tubular body and a sleeve mounted on the tubular body; the body having a central bore therethrough, means for attachment to the work string and at least one radial port; the sleeve including a plurality of moveable pads, and at least one first port and at least one second port, wherein the first port(s) provides access of fluid from the annulus between the tool and the tubing wall to a back surface of theeach pad so that theeach pad is moveable to contact a wall of the tubing such that the tool bears at least a part of a weight of the work string and, the second port(s) provides access of fluid between the radial port(s) of the body and a front surface of theeach pad, so that the tool can be controlled via differential pressure between the annulus and the central bore of the work string.
2. A downhole tool as claimed in claim 1 wherein the pads are arranged to move radially with respect to the longitudinal axis of the bore.
3. A downhole tool as claimed in claim 1 wherein the tubular body includes one or more radial ports for each moveable pad.
4. A downhole tool as claimed in claim 1 wherein the sleeve has a substantially cylindrical outer surface and a substantially square cross-sectional inner surface.
5. A downhole tool as claimed in claim 4 wherein the sleeve includes one or more grooves positioned longitudinally on the outer surface.
6. A downhole tool as claimed in claim 1 wherein the pads include an abrasive outer surface.
7. A downhole tool as claimed in claim 1 wherein the moveable pads can be selectively actuated to contact the wall of the tubing.
8. A downhole tool as claimed in claim 1 wherein the tool includes means to locate the pads in relation to the tubular body.
9. A downhole tool as claimed in claim 8 wherein the means to locate the pads comprises one or more pins there being a respective pin for each pad.
10. A downhole tool as claimed in claim 8 wherein each pad is located in a circular cross-section aperture in the sleeve, and wherein the means for locating each pad against the tubular body is located eccentrically relative to the respective aperture.
11. A method of supporting a work string within tubing in a well bore, the method comprising the steps of:
mounting a downhole tool in the work string, the downhole tool comprising a tubular body and a sleeve mounted on the tubular body, the sleeve including a plurality of moveable pads;
exposing a back surface of each moveable pad to fluid in an annulus defined between the work string and a wall of the tubing through an at least one first port in the sleeve;
exposing a front surface of each moveable pad to fluid in the work string through an at least one radial port in the tubular body and an at least one second port in the sleeve;
running the work string into the tubing;
increasing fluid pressure in the annulus relative to fluid pressure in the work string, such that the fluid pressure acts on the back surface of each moveable pad to the moveable pads to contact the tubing wall, and thereby anchor the tool to the tubing wall; and
increasing the fluid pressure in the work string relative to the fluid pressure in the annulus, such that the fluid pressure acts on the front surface of each moveable pad, to cause the moveable pads to disengage from the tubing wall.
12. A downhole tool for connection in a work string to be inserted into tubing in a well bore, the tool comprising a tubular body including means for attachment to the work string, and a sleeve mounted on the tubular body wherein the sleeve includes a plurality of moveable pads to contact a wall of the tubing and at least one port, the port(s) providing access of fluid from the annulus between the tool and the tubing wall to a back surface of theeach pad, such that the tool bears at least a part of a weight of the work string, and wherein the sleeve has a substantially cylindrical outer surface, a substantially square cross-sectional inner surface and one or more grooves positioned longitudinally on an outer surface thereof.
13. A method of supporting a work string within tubing in a well bore, the method comprising the steps of:
mounting a downhole tool in the work string, the downhole tool comprising a tubular body and a sleeve mounted on the tubular body, the sleeve having a substantially cylindrical outer surface, a substantially square cross-section inner surface and a plurality of moveable pads;
running the work string into the tubing;
increasing fluid pressure in an annulus between the work string and the tubing wall, such that the fluid pressure causes the moveable pads to contact the tubing wall, and thereby anchor the tool to the tubing wall; and
permitting fluid flow along the well bore past the downhole tool along one or more grooves positioned longitudinally in an outer surface of the sleeve.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A reverse-direction staple system comprising a plurality of members to be stacked on top of one another, each of said plurality of members having an upwardly extending staple, a staple access hole, and a staple clearance opening, wherein said upwardly extending staple of each of said plurality of members extends through said staple access hole of a subsequent member and forms a bent staple over said subsequent member and wherein each of said bent staples is received in said staple clearance opening of a second subsequent member.
2. A lamination plate for an electric machine comprising:
a staple access hole defined through said lamination plate; and
a staple clearance opening defined through said lamination plate, wherein said lamination plate is configured to be stacked on a previous lamination plate so that said staple access hole can receive a first staple of said previous lamination plate and said staple clearance opening can receive a second staple bent over said previous lamination plate.
3. The lamination plate as in claim 2, further comprising a third staple extending from said lamination plate.
4. The lamination plate as in claim 3, further comprising more than one staple access hole, more than one staple clearance opening, and more than one third staple.
5. The lamination plate as in claim 3, wherein said third staple extends in an upward direction from said lamination plate.
6. The lamination plate as in claim 2, wherein said lamination plate is configured for use in a rotor core or a stator core.
7. A core for an electric machine comprising:
a first lamination plate having a first staple;
a second lamination plate having a second staple and a second hole; and
a third lamination plate having a third hole and a third opening, said second lamination plate is stacked on said first lamination plate such that said first staple is positioned through said second hole and is bent over said second lamination plate to secure said first and second lamination plates to one another, and said third lamination plate is stacked on said second lamination plate such that said second staple is positioned through said third hole and is bent over said third lamination plate to secure said second and third lamination plates to one another and such that said first staple that is bent over said second lamination plate is received in said third opening.
8. The core as in claim 7, wherein said first staple and said second staple extend in an upward direction from said first and second lamination plates, respectively.
9. The core as in claim 7, wherein said core is a rotor core or a stator core.
10. The core as in claim 7, wherein said third lamination plate further comprises a third staple.
11. The core as in claim 10, further comprising a top lamination plate having a fourth hole and a fourth opening, said top lamination plate is stacked on said third lamination plate such that said third staple is positioned through said fourth hole and is bent over said top lamination plate to secure said third and top lamination plates to one another and such that said second staple that is bent over said third lamination plate is received in said fourth opening.
12. A method of forming a core of an electric machine, comprising:
stamping a first lamination so that said first lamination has a first staple in a first position, a second opening in a second position, and a third hole in a third position;
stamping a second lamination so that said second lamination has a first hole in said first position, a second staple in said second position, a third opening in said third position; and
stamping a third lamination so that said third lamination has a first opening in said first position, a second hole in said second position, and a third staple in said third position.
13. The method as in claim 12, further comprising:
placing said second lamination on said first lamination so that said first staple extends through said first hole; and
bending said first staple over said second lamination to form a first bent staple.
14. The method as in claim 13, further comprising:
placing said third lamination on said second lamination so that said second staple extends through said second hole and said first bent staple is received in said first opening; and
bending said second staple over said third lamination to form a second bent staple.
15. The method as in claim 14, further comprising repeating said stamping, stacking, and bending to achieve a selected core height.
16. The method as in claim 14, further comprising:
stamping a top lamination so that said top lamination has said second opening in said second position and said third hole in a third position;
placing said top lamination on said third lamination so that said third staple extends through said third hole and said second bent staple is received in said second opening; and
bending said third staple over said top lamination to form a third bent staple.
17. The method as in claim 16, further comprising stacking a new second lamination of a second core on said top lamination.