Patent US3758929A successfully refreshed from Google Patents.
US3758929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of a wiping or piston ring
Assignee: Individual
•
Filing: 1971-03-29
•
Granted: 1973-09-18
•
Expires: 1991-03-29
Abstract
Abstract This disclosure refers to improvements in the manufacture of a wiping ring comprising a grooved ring segment having an expander spring therein that presses radially all the exterior circumference of the segment against the wall of a surrounding cylinder and which radial pressure is graduated by the thickness and section of the expander. The segments are manufactured by compression, by means of a die-mold, the parts of which are partially or totally interchangeable.
Inventors
- 👤 M Fabregat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:10
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274; Y10T29/49279; Y10T29/49998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
Improvements in the manufacture of a wiping ring structure having a grooved ringlike segment containing therein a split ringlike expander spring, comprising the steps of: providing a barlike element of metal having a cross sectional configuration consistent with the form and size of the segment which is to be formed; forming a predetermined length of said barlike element into an open or split ringlike member; providing a die assembly having first and second relatively movable die sections, one of said die sections being adapted to support the split ringlike member thereon, the other die section having a disclike punch provided with an annular outwardly extending projection for forming an annular groove in said segment; positioning said ringlike element on said one die section when said other die section is spaced therefrom; pressing said ringlike member between said first and second die sections for forming said segment therebetween with said projection resulting in the formation of an interior annular groove in said segment; removing said segment from said die assembly; and positioning a split ringlike expander spring within the interior groove of said segment.
Claim 2
Dependent Claim
183 words
Improvements in the manufacture of a wiping ring structure having a grooved ringlike segment containing therein a split ringlike expander spring, comprising the steps of: providing a barlike element of metal having a cross sectional configuration consistent with the form and size of the segment which is to be formed; forming a predetermined length of said barlike element into an open or split ringlike member; providing a die assembly having first and second relatively movable die sections, one of said die sections being adapted to support the split ringlike member thereon, the other die section having a disclike punch provided with an annular outwardly extending projection for forming an annular groove in said segment; positioning said ringlike element on said one die section when said other die section is spaced therefrom; pressing said ringlike member between said first and second die sections for forming said segment therebetween with said projection resulting in the formation of an interior annular groove in said segment; removing said segment from said die assembly; and positioning a split ringlike expander spring within the interior groove of said segment.
Claim 3
Dependent Claim
76 words
Improvements according to claim 1, wherein the pressing together of the die sections causes the grooved segment to become attached to the projection formed on said disclike punch, whereby said segment is removed from said die assembly by causing said die sections to be relatively moved away from one another whereby said segment remains attached to the projection associated with said other section, said segment then being expanded to enable removal of same from said projection.
Claim 4
Dependent Claim
51 words
Improvements according to claim 1, including the step of providing radially extending channels on one of the die sections in direct communication with the ringlike member as positioned thereon, and pressing said die sections together for forming said segment and for forming channels in one of the surfaces of the segment.
Claim 5
Dependent Claim
97 words
Improvements according to claim 1, further including the step of finishing the axial end faces of the segment after removal of same from the die assembly to cause the axial end faces to be planar and parallel, said finishing step including the sub-steps of positioning said segment on a platelike magnetic or electromagnetic support member, and holding said segment securely against said support member by means of a disc of ferrite material positioned in the interior of said segment and having edge portions adapted to engage said segment for holding said segment securely against said support member.
Claim 6
Dependent Claim
53 words
Improvements according to claim 4, wherein a ringlike element is disposed in the groove of said segment with said ringlike element projecting radially inwardly beyond the inner edge of said segment, and said disc having the edge thereof disposed in engagement with said ringlike element for holding said segment against said support member.
Claim 7
Dependent Claim
32 words
Improvements according to claim 4, wherein said disc has an axial thickness less than the thickness of said segment, and wherein the annular edge of said disc has a beveled surface thereon.
Claim 8
Dependent Claim
136 words
Improvements according to claim 1, wherein said one section of said die assembly includes a fixed lower base having a centering ring fixedly secured thereto and coacting with Said lower base to define a surface on which the ringlike member can be positioned; wherein the other die section includes an upper movable base disposed opposite the lower base and having said disclike punch fixedly secured thereto and projecting downwardly therefrom toward the lower base, said disclike punch being adapted to extend into said centering ring, said lower base and said centering ring being separable and said upper base and said disclike punch being separable to permit the various components of the die assembly to be readily interchanged to permit the size and cross section of the segment and of the groove therein to be readily varied.
Claim 9
Dependent Claim
33 words
Improvements according to claim 7, wherein the interior groove formed in said segment has a triangular or rectangular cross section, and wherein the expander spring has a triangular or rectangular cross section, respectively.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |