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(12) Patent: | (11) CA 2472299 |
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(54) English Title: | AMELIORATION DE LA CAPACITE DE RETENTION D'UNE AUBE A ATTACHE MARTEAU DISSYMETRIQUE |
(54) French Title: | IMPROVEMENT IN THE RETENTION CAPACITY OF AN ASSYMETRIC HAMMER ATTACHMENT BLADE |
Status: | Granted and Issued |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | ROBIC AGENCE PI S.E.C./ROBIC IP AGENCY LP |
(74) Associate agent: | |
(45) Issued: | 2012-10-16 |
(22) Filed Date: | 2004-06-22 |
(41) Open to Public Inspection: | 2005-01-07 |
Examination requested: | 2009-06-10 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | French |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | ||||||
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The invention relates to a method of improving the retention capacity of a blade (1) having an asymmetrical hammerhead connection and extending in a conical stream, with the root (2) of the blade being retained in a peripheral groove (7) in a disk (12), said groove having an upstream lip (5) and a downstream lip (6) presenting respective bearing surfaces (4a, 4b) that extend in planes that are asymmetrical relative to planes perpendicular to the axis of rotation of said disk, and against which the surfaces (3a, 3b) of the upstream and downstream flanks of said root come to bear (4a), the bearing surface of said upstream lip (5) being connected to the bottom wall (8) of said groove (7) via a rounded surface (9a), and the upstream flank presenting, in the vicinity of said rounded surface, a heel (11) situated inside a circle (C) of radius (R) centered on the axis about which said blade (1) tends to pivot when axial stress is applied thereto, said circle outlining, in the upstream lip, a crescent shape of thickness e, wherein: a) the connection between the bearing surface (4a) of the upstream lip (5) and the bottom wall of the groove (7) is modified by removing material from said disk; and (b) said disk is fitted with blades (3a) in which the upstream flanks (3a) present respective heels (31) of greater volume so as to increase the value of the radius (R) and the value of the thickness e.
L'invention concerne un procédé pour améliorer la capacité de rétention d'une aube (1) à attache marteau asymétrique qui s'étend dans une veine conique et dont le pied (2) est retenu dans une gorge périphérique (7) d'un disque (12), ladite gorge comportant une lèvre amont (5) et une lèvre aval (6) présentant des portées (4a, 4b) qui s'étendent dans les plans asymétriques par rapport à un plan perpendiculaire à l'axe de rotation dudit disque et sur lesquelles les surfaces (3a, 3b) des flancs amont et aval dudit pied sont en appui, la portée (4a) de ladite lèvre amont (5) étant raccordée au fond (8) de ladite gorge (7) par une surface arrondie (9a) et le flanc amont comportant au voisinage de ladite surface arrondie un talon (11) situé à l'intérieur d'un cercle géométrique (C) de rayon (R) centré sur l'axe de pivotement possible de ladite aube (1) par suite d'une sollicitation axiale, ledit cercle géométrique (C) découpant dans la lèvre amont (5) un croissant d'épaisseur e, caractérisé par le fait que : a) l'on modifie le raccord entre la portée (4a) de la lèvre amont (5) et le fond (8) de la gorge (7) par enlèvement de matière dudit disque, et b) on équipe ledit disque avec des aubes (3a) dont le flanc amont (3a) présente un talon (31) plus volumineux afin d'augmenter la valeur du rayon (R) et la valeur de la distance e.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
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Description | Date |
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Common Representative Appointed | 2019-10-30 |
Common Representative Appointed | 2019-10-30 |
Change of Address or Method of Correspondence Request Received | 2018-12-04 |
Grant by Issuance | 2012-10-16 |
Inactive: Cover page published | 2012-10-15 |
Inactive: Final fee received | 2012-07-18 |
Pre-grant | 2012-07-18 |
Notice of Allowance is Issued | 2012-03-16 |
Letter Sent | 2012-03-16 |
Notice of Allowance is Issued | 2012-03-16 |
Inactive: Approved for allowance (AFA) | 2012-02-28 |
Amendment Received - Voluntary Amendment | 2011-09-26 |
Inactive: S.30(2) Rules - Examiner requisition | 2011-04-01 |
Inactive: Correspondence - MF | 2010-08-10 |
Letter Sent | 2009-07-28 |
Request for Examination Requirements Determined Compliant | 2009-06-10 |
All Requirements for Examination Determined Compliant | 2009-06-10 |
Request for Examination Received | 2009-06-10 |
Letter Sent | 2008-04-29 |
Application Published (Open to Public Inspection) | 2005-01-07 |
Inactive: Cover page published | 2005-01-06 |
Inactive: First IPC assigned | 2004-12-08 |
Inactive: Filing certificate - No RFE (French) | 2004-08-02 |
Filing Requirements Determined Compliant | 2004-08-02 |
Letter Sent | 2004-08-02 |
Application Received - Regular National | 2004-08-02 |
There is no abandonment history.
The last payment was received on 2012-05-29
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
Please refer to the CIPO Patent Fees web page to see all current fee amounts.
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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SNECMA |
Past Owners on Record |
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BRUCE PONTOIZEAU |
CHRISTOPHE FOLLONIER |
CLAUDE LEJARS |
JEROME MACE |
PATRICK REGHEZZA |