IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0706958
(2000-11-06)
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발명자
/ 주소 |
- Koleilat, Bashir M.
- Cain, David E.
- Zheng, Qiu Shi
- Hunt, Michael
|
출원인 / 주소 |
|
대리인 / 주소 |
Jackson, James L.Andrews & Kurth, LLP
|
인용정보 |
피인용 횟수 :
26 인용 특허 :
7 |
초록
▼
A mechanically energized annular packoff seal cartridge for metal-to-metal sealing with substantially concentrically arranged tubular members, such as the tubular wellhead housing and well casing of an oil and gas well. A tubular pressure responsive energizing mandrel having downwardly converging fr
A mechanically energized annular packoff seal cartridge for metal-to-metal sealing with substantially concentrically arranged tubular members, such as the tubular wellhead housing and well casing of an oil and gas well. A tubular pressure responsive energizing mandrel having downwardly converging frusto-conical seal actuating surfaces is of a dimension for entry into the annulus between the wellhead seal bore and the rough outer surface of the well casing. Elastomer seals are carried by the energizing mandrel and establish sealing of the energizing mandrel with the wellhead housing and well casing A pair of soft metal seal rings are carried by the seal cartridge and are forced radially into metal-to-metal sealing with the wellhead housing and the rough outer surface of the well casing respectively by the double tapered seal actuating surfaces responsive to pressure induced downward force on the energizing mandrel. A locking mandrel and the seal actuating mechanism are restrained against actuating movement during running of the seal cartridge by a running tool by shear pins, thus enabling the cartridge to pass through various well equipment. The shear pin of the locking mandrel is sheared by downward force applied by the running tool to lock the seal cartridge within the wellhead housing. The shear pin of the seal actuating mechanism is sheared, after locking of the cartridge to the wellhead housing, by the force of pressure introduced into the wellhead above the seal cartridge which acts to develop a pressure differential across the elastomer seals of the cartridge.
대표청구항
▼
A mechanically energized annular packoff seal cartridge for metal-to-metal sealing with substantially concentrically arranged tubular members, such as the tubular wellhead housing and well casing of an oil and gas well. A tubular pressure responsive energizing mandrel having downwardly converging fr
A mechanically energized annular packoff seal cartridge for metal-to-metal sealing with substantially concentrically arranged tubular members, such as the tubular wellhead housing and well casing of an oil and gas well. A tubular pressure responsive energizing mandrel having downwardly converging frusto-conical seal actuating surfaces is of a dimension for entry into the annulus between the wellhead seal bore and the rough outer surface of the well casing. Elastomer seals are carried by the energizing mandrel and establish sealing of the energizing mandrel with the wellhead housing and well casing A pair of soft metal seal rings are carried by the seal cartridge and are forced radially into metal-to-metal sealing with the wellhead housing and the rough outer surface of the well casing respectively by the double tapered seal actuating surfaces responsive to pressure induced downward force on the energizing mandrel. A locking mandrel and the seal actuating mechanism are restrained against actuating movement during running of the seal cartridge by a running tool by shear pins, thus enabling the cartridge to pass through various well equipment. The shear pin of the locking mandrel is sheared by downward force applied by the running tool to lock the seal cartridge within the wellhead housing. The shear pin of the seal actuating mechanism is sheared, after locking of the cartridge to the wellhead housing, by the force of pressure introduced into the wellhead above the seal cartridge which acts to develop a pressure differential across the elastomer seals of the cartridge. a first printing drum formed with an ink permeable outer peripheral wall adapted to be mounted with a stencil sheet, a first ink supply unit supplying ink to an inner periphery of the first printing drum, and a first press rotary member operative to be held in a pressured position in contact with the outer peripheral wall of the first printing drum to allow ink to be transferred onto one surface of a print medium; a downstream printing section including a second printing drum formed with an ink permeable outer peripheral wall adapted to be mounted with a stencil sheet, a second ink supply unit supplying ink to an inner periphery of the second printing drum, and a second press rotary member operative to be held in a pressured position in contact with the outer peripheral wall of the second printing drum to allow ink to be transferred onto the other surface of the print medium; a paper feed section feeding the print medium to the upstream printing section; and a printing-drum drive escape mechanism operative to shift either selected one of the first and second printing drums into a drive escape position to interrupt rotation of the selected printing drum while retaining either selected one, associated with the selected printing drum, of the first and second press rotary members in a separated position to pass the print medium into a sheet discharge section along the selected printing drum without contact with the selected press rotary member, in the one side printing mode. 2. The stencil printing machine according to claim 1, further comprising: an upstream transfer unit transferring the print medium, discharged from the upstream printing section, to be fed to the downstream printing section; and a downstream transfer unit transferring the print medium, discharged from the downstream printing section, to be fed to the sheet discharge section. 3. The stencil printing machine according to claim 1, wherein the selected printing drum remains in the drive escape position at a rotational angular position where the print medium is held in contact with the selected printing drum in an area except for a perforated area of the stencil sheet and a stencil clamping area of the selected printing drum. 4. The stencil printing machine according to claim 1, wherein the selected printing drum functions to transfer ink to a surface, which serves as an upper surface when placed in a stacked state in the sheet discharge section, of the print medium. 5. The stencil printing machine according to claim 1, wherein the second printing drum is selected to be operated with the printing-drum drive escape mechanism in the one side printing mode. 6. The stencil printing machine according to claim 1, further comprising a single drive source rotating the first printing drum and the second printing drum in synchronism with each other while retaining a relative rotational angular phase difference in the both sides printing mode. 7. The stencil printing machine according to claim 1, wherein the selected press rotary member associated with the selected printing drum is able to shift between the pressured position and the separated position in association with-rotation of the selected printing drum. 8. A method of selectively carrying out a printing operation in a both sides printing mode and in a one side printing mode, comprising: providing an upstream printing section including a first printing drum and a first press rotary member operative to shift between a pressured position and a separated position relative to the first printing drum; providing a downstream printing section including a second printing drum and a second press rotary member operative to shift between a pressured position and a separated position relative to the second printing drum; providing a printing-drum drive escape mechanism operative to enable a shift of either selected one of the first and second printing drums into a drive escape position; feeding a print medium to t he upstream printing section; and feeding the print medium, which is discharged from the first printing drum of the upstream printing section, to the downstream printing section, wherein, when the one side printing mode is selected, the printing-drum drive escape mechanism is operative to shift either selected one of the first and second printing drums to the drive escape position to render the selected printing drum inoperative and to render the selected press rotary member to remain in the separated position away from the selected printing drum to pass the print medium into a sheet discharge section along the selected printing drum without contact with the selected press rotary member, in the one side printing mode. enerator generates different electrical signals at each of the remaining electrical conductors and wherein the signal detector is adapted to detect each electrical signal and to generate a second output identifying the electrical conductors that are in contact with the printing plate. 6. The imaging apparatus of claim 4, wherein the electrical signal generator generates a separate voltage signal at each of the remaining electrical conductors and wherein the signal detector comprises a voltage signal detector. 7. The imaging apparatus of claim 6, wherein the signal detector comprises a voltage detector calibrated to detect each individual voltage signal and to generate a second output identifying conductors that are not in contact with the printing plate. 8. The imaging apparatus of claim 3, wherein the printing plate has a corner and electrical conductors are arranged to detect a corner of the printing plate. 9. The imaging apparatus of claim 3, wherein the output signal comprises a radio frequency signal and wherein the imaging apparatus has a radio frequency receiver to detect the radio frequency signal. 10. The imaging apparatus of claim 3, wherein the mounting surface comprises a rotatable drum. 11. The imaging apparatus of claim 10, wherein the output from the electrical circuit comprises an electrical signal transmitted to a rotating surface of the drum and wherein the imaging apparatus has a slip ring to engage the rotating surface of the drum. 12. The imaging apparatus of claim 3, wherein the mounting surface comprises a platen. 13. The imaging apparatus of claim 3, wherein the mounting surface comprises a printing plate. 14. The imaging apparatus of claim 3, wherein the printing plate has a conductive edge. 15. The imaging apparatus of claim 3, wherein the printing plate further comprises a conductive edge wrapping. 16. The imaging apparatus of claim 3, wherein the printing plate comprises at least two edges having a conductive coating. 17. The imaging apparatus of claim 3, wherein the printing plate has at least two electrically conductive edges and the electrical conductors extend from the mounting surface to define electrically conductive abutments. 18. The imaging apparatus of claim 17, wherein the printing plate has axial and lateral edges and wherein all of the electrical conductors are positioned to contact an edge of the printing plate, at least one of the electrical conductors is arranged to engage a lateral edge and at least one of the electrical conductors is arranged to engage a longitudinal edge. 19. The imaging apparatus of claim 18, wherein the printing plate has a corner and wherein electrical conductors are arranged to detect a corner of the printing plate. 20. A mounting surface for receiving electrically conductive printing plates; the mounting surface comprising: an outer surface having at least three electrically isolated conductors arranged so that when the electrically conductive printing plate is in registration on the mounting surface the electrically conductive printing plate defines an electrical connection between all of the electrical conductors; an electrical circuit adapted to sense an electrical connection between all of the conductors and to thereupon generate an output; and a charge generator to electrically charge the mounting surface to attract the printing plate to the mounting surface and wherein the electrical circuit detects an electrical connection between each of the electrical conductors by detecting the presence of charge at all of the electrical conductors. 21. The mounting surface of claim 20 wherein the electrical circuit comprises a signal detector adapted to sense electrical signals at a first electrical conductor and an electrical signal generator generating an electrical signal at each of the remaining electrical conductors wherein the signal detector is adapted to generate an output when a signal at the first electrical conductor includes a signal from all of
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