US3901519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamping of parts by adherence on axial thrust support
Assignee: Renault SA
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Filing: 1973-08-22
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Granted: 1975-08-26
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Expires: 1993-08-22
Abstract
Abstract A clamping device, especially for pistons of internal combustion motors, permitting previous indexing and ensuring the handling and maintenance in position of the said pistons during the halffinish and finish machining operations of the skirt and the lands of said pistons. The device comprises a receiving member in frontal support of the head of a workpiece, presenting, centering and indexing members for the piece towards the said receiving member, and members intended to apply the piece against the presenting member by supporting the face of the head of the piece opposite to its face which is frontally supported against the receiving member.
Inventors
- 👤 Pierre Lecailtel
- 👤 Bruno Dressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/19; B23B5/00; Y; Y10; Y10T; Y10T279/00; Y10T279/13; Y10T279/26; Y10T279/33; Y10T82/00; Y10T82/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
A clamping device for pieces to be machined adapted for the initial centering and indexing of the work piece such as a piston comprising: a receiving member adapted for frontly supporting a face on the head of a work piece to be machined; fixed support members positioned on said receiving member for supporting a work piece to be machined; a retractable centering element surrounding said receiving member for initially centering a work piece to be machined and adapted to be retracted away from the work piece during the machining operation; an oscillatable thrust rod free for rotation about its own axis and elastically coupled to a thrust body; said thrust rod supporting the portion of a work piece to be machined opposite to its face supported by said receiving member; said receiving member comprises circular plate which carries the fixed support members which are placed adjacent the periphery of said plate; and a rockable support member articulated by a swivel joint on one extremity of the thrust-rod, the rockable support member having a plurality of supporting points which, when the device is clamping a work piece to be machined, cooperate with the fixed support members on the circular plate.
Claim 2
Dependent Claim
199 words
A clamping device for pieces to be machined adapted for the initial centering and indexing of the work piece such as a piston comprising: a receiving member adapted for frontly supporting a face on the head of a work piece to be machined; fixed support members positioned on said receiving member for supporting a work piece to be machined; a retractable centering element surrounding said receiving member for initially centering a work piece to be machined and adapted to be retracted away from the work piece during the machining operation; an oscillatable thrust rod free for rotation about its own axis and elastically coupled to a thrust body; said thrust rod supporting the portion of a work piece to be machined opposite to its face supported by said receiving member; said receiving member comprises circular plate which carries the fixed support members which are placed adjacent the periphery of said plate; and a rockable support member articulated by a swivel joint on one extremity of the thrust-rod, the rockable support member having a plurality of supporting points which, when the device is clamping a work piece to be machined, cooperate with the fixed support members on the circular plate.
Claim 3
Dependent Claim
31 words
A clamping device as set forth in claim 1, wherein the centering element comprises three centering fingers which are retractable in unison and are guided along generator lines of a cone.
Claim 4
Dependent Claim
45 words
A clamping device as set forth in claim 1, wherein there are three fixed support members, and the supporting points of the articulated rockable support member are three pegs angularly spaced apart by 120* which co-operate with the three support members on the circular plate.
Claim 5
Dependent Claim
52 words
A clamping device as set forth in claim 1, further comprising: an alignment member comprising a ring axially slidable on the thrust rod and non-rotatable relative thereto, the ring having V-shaped recesses adapted to engage bosses on a work piece to be machined for carrying out rotary alignment of the work piece.
Claim 6
Dependent Claim
78 words
A clamping device as set forth in claim 4, wherein the ring is provided with two spring-loaded balls which co-operate with two axially-extending grooves defined in the thrust rod to prevent rotation of the ring on the thrust rod, each groove terminating, at that end of the groove nearest the rockable support member, in a recess, whereby, when the balls are aligned with the recesses, the ring is retained at a predetermined axial position on the thrust rod.
Claim 7
Dependent Claim
41 words
A clamping device as set forth in claim 5, further comprising: an abutment for the ring, whereby, upon retraction of the thrust rod, the ring is held stationary against the abutment so that the recesses move into alignment with the balls.
Claim 8
Dependent Claim
78 words
A clamping device as set forth in claim 1, wherein at least one transverse peg projects from the thrust rod and a recess is defined in the thrust body corresponding to the transverse peg, and a spring is arranged to act between the thrust rod and the thrust body to urge the thrust rod into an axial position in which the peg engages the recess thereby to fix the thrust rod against rotation relative to the thrust body.
Claim 9
Dependent Claim
39 words
A clamping device as set forth in claim 1, wherein the thrust rod is mounted in the thrust body by means of a bearing whereby the thrust rod is slidable in the thrust body and is pivotable relative thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |