# US 4,397,145 A · Universal link chain > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,397,145 A - Document ID: US4397145A - Status: Granted - Kind: A - Application number: 06/268,729 - Filed: 1981-06-01 - Granted: 1983-08-09 - Earliest claimed: 1980-06-06 - Assignees: Ferag AG - Inventors: Walter Reist - Web page: https://patentgrep.com/patent/US4397145A ## CPC - F16G 13/10: with universal joints - Y10T 74/1884: with sprocket wheel - Y10T 74/20456: Specific cable or sheath structure - F16G: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A universal or ball pivot-link chain arrangement has chain link elements subdivided in an axial plane, each chain link element has a ball pivot body provided with an undercut portion of substantially hemispherical shape. A ball socket enclosing the ball pivot body of an adjacent link has a ring connection at the region of said undercut portion of the adjacent link. Each ring connection has ring-shaped braces engaging countersurfaces of the ball socket. These braces are effective not only in the radial direction, but are arranged to act as blocking devices against any relative displacement of the two halves of the chain link elements in the axial direction. ## Claims ### Claim 1 A universal link chain arrangement comprising: a plurality of chain link elements, each of said chain link elements possessing at one end a ball pivot body and at the other end a ball socket adapted to receive the ball pivot body of the directly neighboring chain link element, each of said chain link elements being subdivided in an axial plane into two separate halves and possessing a first ring connection located at the end region of the ball socket, said ball pivot body having an undercut portion of hemispherical shape, said ball socket being surrounded by a second ring connection located at the region of said undercut portion of the directly neighboring chain link element, both of said ring connections being retainer rings spaced axially out of contact from each other and fittingly bearing on counter surfaces of the ball socket, whereby the retainer rings may be slid over the two halves from opposite end regions of the ball socket. ### Claim 2 (depends on 1) The link chain arrangement as defined in claim 1, wherein said counter surfaces of the ball socket and working surfaces of the retainer rings are cylindrical in shape. ### Claim 3 A universal link chain arrangement comprising: a plurality of chain link elements, each of said chain link elements possessing at one end a ball pivot body and at the other end a ball socket adapted to receive the ball pivot body of the directly neighboring chain link element, each of said chain link elements being subdivided in an axial plane into two separate halves and possessing a first ring connection located at the end region of the ball socket, said ball pivot body having an undercut portion of hemispherical shape, said ball socket being surrounded by a second ring connection located at the region of said undercut portion of the directly neighboring chain link element, both of said ring connections having retainer rings spaced axially from each other and fittingly bearing on counter surfaces of the ball socket; wherein said counter surfaces of the ball socket and working surfaces of the retainer rings are cylindrical in shape; and wherein said counter surfaces are provided on opposing sides of a peripheral annular shoulder of the ball socket. ### Claim 4 A universal link chain arrangement comprising a plurality of chain link elements, each of said chain link elements possessing at one end a ball pivot body and at the other end a ball socket adapted to receive the ball pivot body of the directly neighboring chain link element, each of said chain link elements being subdivided in an axial plane into two halves and possessing a first ring connection located at the end region of the ball socket, said ball pivot body comprising an undercut portion of hemispherical shape and the ball socket is surrounded by a second ring connection located at the region of said undercut portion of a neighboring chain link, both of said ring connections comprising retainer rings fittingly bearing on counter surfaces of the ball socket, and said retainer rings each being supported in the axial direction by a respective expanding component engaging a peripheral groove of the ball socket. ### Claim 5 (depends on 4) The link chain arrangement as defined in claim 4, wherein retainer rings and snap rings are provided, and said snap rings define said expanding components. ### Claim 6 (depends on 5) The link arrangement as defined in claim 5, wherein the snap rings comprise rectangular cross-sections. ### Claim 7 (depends on 4) The link chain arrangement as defined in claim 4, wherein the retainer rings comprise parts engaging the peripheral groove and said retainer rings are adapted to elastically expand at the region of said parts. ### Claim 8 (depends on 7) The link chain arrangement as defined in claim 7, wherein the retainer rings possess a reduced cross-section in the region of the parts engaging the peripharal groove. ### Claim 9 (depends on 7, 8) The link chain arrangement as defined in claim 7 or 8, wherein the retainer ring parts engaging the groove are saw tooth shaped and each comprise a steep flank engaging a wall of said groove. ### Claim 10 A universal link chain arrangement comprising: a plurality of chain link elements, each of said chain link elements possessing at one end a ball pivot body and at the other end a ball socket adapted to receive the ball pivot body of the directly neighboring chain link element, each of said chain link elements being subdivided in an axial plane into two separate halves and possessing a first ring connection located at the end region of the ball socket, said ball pivot body having an undercut portion of hemispherical shape, said ball socket being surrounded by a second ring connection located at the region of said undercut portion of the directly neighboring chain link element, both of said ring connections having retainer rings spaced axially from each other and fittingly bearing on counter surfaces of the ball socket; wherein the ball socket comprises a spherical ring-shaped guide surface located between the retainer rings. ### Claim 11 (depends on 10) The link chain arrangement as defined in claim 10, wherein the peripheral surfaces of the retainer rings are adapted to form spherical extensions of the guide surfaces.