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Catheter introducer with hub seal and removal tab
PATENTS
PATENTS
Patent number: WO/2011/065241 Inventors: T. Watanabe, S. Honda and H. Sato Publication date: 3 June 2011
Sealing for a connector assembly Applicant: FCI Automotive Holding, France A seal for an electrical connector forms the subject of this patent, It is designed to provide improved sealing over a wide range of temperatures. A specific feature of this connector is that it includes an elastomeric seal which is larger than the ones used previously on connectors. This seal element typically has an aspect ratio where its thickness is 0.5–0.7 of its width. It can have sealing lobes that are typically compressed by at least 10% to achieve reliable sealing. The angles of the lobe design are discussed in the patent. A number of potential geometries that have between one and three sealing lobes are also illustrated. Patent number: WO/2011/064628 Inventors: E. Guillanton and G. Schmitt Publication date: 3 June 2011
Piston ring Applicant: Nippon Piston Ring Co Ltd, Japan Details of a piston ring are provided. Its design enables anti-wear, gas-seal and oilremoving properties to be simultaneously satisfied. Most of the sliding surface has a hard wear-resistant coating. The lower section of the ring profile – below the hard, coated surface – is profiled to provide a means of controlling oil. A range of potential geometries are illustrated. Patent number: WO/2011/064888 Inventors: K. Fujimura A. Chiba, N. Akimoto and I. Hiraishi Publication date: 3 June 2011
Gasket and seal structure Applicant: NOK Corp, Japan This patent covers a gasket and a seal structure that exhibits sealing properties without being affected by the state of the contact surface of an attached object. It is effectively a rectangular section seal with one domed surface and an opposing sealing surface with a pair of lobes residing either side of an arc. The radius of curvature (UD) and the section width (G) of the arciform portion satisfy the boundary conditions 0.75 d UD/G d 2.0. The sealing counterface engaged by the domed section also has a recess in a number of illustrations, but this is not explained in the English abstract. 12
Sealing Technology
Sealing structure for a flow-control valve Applicant: LIXIL Corp, Japan This patent discloses details of a seal structure for a flow-control valve. When sealing is necessary, this structure can provide a good seal in a gap between valve elements and an axial sliding surface of the valve housing. It is also capable of minimising sliding resistance. Seal members, which are composed of flexible membranes, seal a gap that is created by the fitting clearance (C) between an axial sliding surface of the valve housing and a ‘‘cold-waterside’’ valve element and ‘‘hot-water-side’’ valve element of a pressure balance valve. The latter controls the inflow rate of cold and hot water by moving the balance valve element along the sliding surface and opening or closing the cold-water inflow passage and hot-water inflow passage. The seal members are pushed up against (and made to adhere to) the corresponding seal walls by fluid pressure in the gap, thereby creating a seal. Patent number: WO/2011/065548 Inventor: M. Hashimoto Publication date: 3 June 2011 Technical Editor’s comment: The sealing discs appear to be flat radial discs manufactured from a resilient material. It seems that they work by being pressurised into contact with the radial faces of a slot. However, clearance all around the disc is illustrated for a number of situations.
Pressure-balanced floating seal housing assembly Applicant: Kalsi Engineering Inc, USA This invention concerns a high-pressure rotary seal arrangement intended for use in down-hole applications. It is believed to be particularly well suited to under-balanced oilfield drilling equipment of the type that is used for controlling pressure in wells during drilling operations. A pressure-balanced seal housing is provided to maintain a small extrusion gap and good run-out capability. The high-pressure rotary seal requires a small seal-to-housing extrusion gap clearance in order to avoid extrusion damage. However, the clearance must be large enough to avoid shaft-to-housing contact. If shaft-tohousing contact occurs at the extrusion gap, the housing then assumes the load intended for the bearings. The preferred embodiment of this invention is a seal housing arrangement for high, differential pressure rotary seals, which uses applied pressure to provide an hydraulic force balance in the axial direction, which frees the seal housing to translate laterally to follow shaft deflection and run-out. It does not require a stepped shaft diameter and, therefore, is compatible with reciprocating shafts. If desired, a simple piston-type pressurisation system can be used to produce the applied pressure. A number of different pressure-compensation and self-alignment methods – including an integral bearing – are illustrated. Patent number: WO/2011/066575 Inventor: L.L. Dietle Publication date: 3 June 2011
Catheter introducer with hub seal and removal tab Applicant: Retractable Technologies Inc, USA The catheter introducer described by this patent has a hub seal that engages with the rear opening of the hub in order to impede the flow of liquid out of the hub, following catheter insertion and the subsequent withdrawal of the needle when the housing is separated from the catheter hub. The seal is preferably made from a rubbery material and can be placed between the housing and catheter assembly or can be attached to the catheter assembly. Patent number: WO/2011/066022 Inventors: T.J. Shaw, K.M. Duesman and N. Zhu Publication date: 3 June 2011
An example of the type of pressure-balanced floating seal housing described by patent WO/2011/066575.
December 2011
PATENTS
Patent number: WO/2011/065241 Inventors: T. Watanabe, S. Honda and H. Sato Publication date: 3 June 2011
Sealing for a connector assembly Applicant: FCI Automotive Holding, France A seal for an electrical connector forms the subject of this patent, It is designed to provide improved sealing over a wide range of temperatures. A specific feature of this connector is that it includes an elastomeric seal which is larger than the ones used previously on connectors. This seal element typically has an aspect ratio where its thickness is 0.5–0.7 of its width. It can have sealing lobes that are typically compressed by at least 10% to achieve reliable sealing. The angles of the lobe design are discussed in the patent. A number of potential geometries that have between one and three sealing lobes are also illustrated. Patent number: WO/2011/064628 Inventors: E. Guillanton and G. Schmitt Publication date: 3 June 2011
Piston ring Applicant: Nippon Piston Ring Co Ltd, Japan Details of a piston ring are provided. Its design enables anti-wear, gas-seal and oilremoving properties to be simultaneously satisfied. Most of the sliding surface has a hard wear-resistant coating. The lower section of the ring profile – below the hard, coated surface – is profiled to provide a means of controlling oil. A range of potential geometries are illustrated. Patent number: WO/2011/064888 Inventors: K. Fujimura A. Chiba, N. Akimoto and I. Hiraishi Publication date: 3 June 2011
Gasket and seal structure Applicant: NOK Corp, Japan This patent covers a gasket and a seal structure that exhibits sealing properties without being affected by the state of the contact surface of an attached object. It is effectively a rectangular section seal with one domed surface and an opposing sealing surface with a pair of lobes residing either side of an arc. The radius of curvature (UD) and the section width (G) of the arciform portion satisfy the boundary conditions 0.75 d UD/G d 2.0. The sealing counterface engaged by the domed section also has a recess in a number of illustrations, but this is not explained in the English abstract. 12
Sealing Technology
Sealing structure for a flow-control valve Applicant: LIXIL Corp, Japan This patent discloses details of a seal structure for a flow-control valve. When sealing is necessary, this structure can provide a good seal in a gap between valve elements and an axial sliding surface of the valve housing. It is also capable of minimising sliding resistance. Seal members, which are composed of flexible membranes, seal a gap that is created by the fitting clearance (C) between an axial sliding surface of the valve housing and a ‘‘cold-waterside’’ valve element and ‘‘hot-water-side’’ valve element of a pressure balance valve. The latter controls the inflow rate of cold and hot water by moving the balance valve element along the sliding surface and opening or closing the cold-water inflow passage and hot-water inflow passage. The seal members are pushed up against (and made to adhere to) the corresponding seal walls by fluid pressure in the gap, thereby creating a seal. Patent number: WO/2011/065548 Inventor: M. Hashimoto Publication date: 3 June 2011 Technical Editor’s comment: The sealing discs appear to be flat radial discs manufactured from a resilient material. It seems that they work by being pressurised into contact with the radial faces of a slot. However, clearance all around the disc is illustrated for a number of situations.
Pressure-balanced floating seal housing assembly Applicant: Kalsi Engineering Inc, USA This invention concerns a high-pressure rotary seal arrangement intended for use in down-hole applications. It is believed to be particularly well suited to under-balanced oilfield drilling equipment of the type that is used for controlling pressure in wells during drilling operations. A pressure-balanced seal housing is provided to maintain a small extrusion gap and good run-out capability. The high-pressure rotary seal requires a small seal-to-housing extrusion gap clearance in order to avoid extrusion damage. However, the clearance must be large enough to avoid shaft-to-housing contact. If shaft-tohousing contact occurs at the extrusion gap, the housing then assumes the load intended for the bearings. The preferred embodiment of this invention is a seal housing arrangement for high, differential pressure rotary seals, which uses applied pressure to provide an hydraulic force balance in the axial direction, which frees the seal housing to translate laterally to follow shaft deflection and run-out. It does not require a stepped shaft diameter and, therefore, is compatible with reciprocating shafts. If desired, a simple piston-type pressurisation system can be used to produce the applied pressure. A number of different pressure-compensation and self-alignment methods – including an integral bearing – are illustrated. Patent number: WO/2011/066575 Inventor: L.L. Dietle Publication date: 3 June 2011
Catheter introducer with hub seal and removal tab Applicant: Retractable Technologies Inc, USA The catheter introducer described by this patent has a hub seal that engages with the rear opening of the hub in order to impede the flow of liquid out of the hub, following catheter insertion and the subsequent withdrawal of the needle when the housing is separated from the catheter hub. The seal is preferably made from a rubbery material and can be placed between the housing and catheter assembly or can be attached to the catheter assembly. Patent number: WO/2011/066022 Inventors: T.J. Shaw, K.M. Duesman and N. Zhu Publication date: 3 June 2011
An example of the type of pressure-balanced floating seal housing described by patent WO/2011/066575.
December 2011