# US 11,077,519 B1 · Clamping device that develops both axial and circumferential clamping forces in response to a common axial clamping force > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,077,519 B1 - Document ID: US11077519B1 - Status: Granted - Kind: B1 - Application number: 16/170,816 - Filed: 2018-10-25 - Granted: 2021-08-03 - Earliest claimed: 2018-10-25 - Assignees: Seagate Technology LLC - Applicants: Seagate Technology LLC - Inventors: Jerome Thomas Coffey; Samuel Edward Severson; Jeffrey L. Bruce; Patrick J. Hains; John W. Rigsby - Web page: https://patentgrep.com/patent/US11077519B1 ## CPC - B23K 20/126: {Workpiece support, i.e. backing or clamping} - B25B 1/2478: {with more than one pair of jaws} - G11B 33/02: Cabinets; Cases; Stands; Disposition of apparatus therein or thereon - H05K 5/0052: {characterized by joining features of the housing parts} - B23K 37/0435: {Clamps} - H05K 5/066: {sealed by fusion of the joining parts without bringing material; sealed by brazing} - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract Clamping devices and associated methods that are useful to develop both axial and circumferential clamping forces in response to a common axial clamping force. The clamp is able to use a simple mechanism to generate both kinds of clamping forces from a single, axial actuating force. The clamping devices of the present invention are particularly useful for clamping cover and base deck components of a hard disk drive enclosure together to allow the components to be joined and sealed together using welding techniques. ## Claims ### Claim 1 A clamping device for holding a workpiece assembly with an axial clamping force and a circumferential clamping force responsive to an axial actuation force acting on the clamping device, said clamping device comprising: a) a circumferentially resizable, subdivided clamping shroud defining a circumferentially resizable clamping enclosure, said clamping shroud comprising a plurality of shroud portions that are laterally translatable on demand, wherein the shroud portions are coupled together such that lateral translation of the shroud portions occurs in a coordinated manner through a range of motion comprising an open configuration in which the shroud portions are relatively farther apart relative to each other such that the clamping shroud is circumferentially enlarged relative to the workpiece assembly and a clamping configuration in which the shroud portions are relatively closer together laterally relative to each other such that the clamping shroud is circumferentially closed in a manner effective for the clamping shroud to circumferentially grip and clamp the workpiece assembly, wherein the shroud portions are under a bias to be in the open configuration, wherein the shroud portions are translated to the closed configuration in opposition to said bias responsive to the axial actuation force acting on the clamping device, and wherein at least one of the shroud portions comprises at least one corresponding bearing surface; b) a clamping body housed at least partially in the resizable clamping enclosure, said clamping body being axially interposed between the clamping shroud and the workpiece assembly; and c) an actuating member coupled to the clamping shroud in a manner such that the axial actuation force acting on the clamping device causes the actuating member (i) to engage the at least one corresponding bearing surface of at least one shroud portion in a manner effective to both drive the at least one shroud portion laterally inward to cause the resizable clamping shroud to circumferentially grip and clamp the workpiece assembly, and (ii) to cause the clamping body to axially engage the clamping shroud and cause the clamping shroud to axially press against the clamping body to apply an axial clamping force against the workpiece assembly. ### Claim 2 (depends on 1) The clamping device of claim 1, wherein a shroud portion includes a cover panel and a sidewall extending from the cover panel. ### Claim 3 (depends on 2) The clamping device of claim 2, wherein the sidewall of the shroud includes a lower rim and a clamping jaw proximal to the lower rim that projects laterally inward toward the inside of the clamping enclosure. ### Claim 4 (depends on 1) The clamping device of claim 1, wherein the shroud portions are configured to subdivide the clamping shroud into quadrants, and wherein the shroud portions are separated by resizable side to side gaps and resizable end to end gaps. ### Claim 5 (depends on 3) The clamping device of claim 3, wherein the sidewall extends continuously around the outer periphery of the shroud portion. ### Claim 6 (depends on 5) The clamping device of claim 5, wherein the sidewall has an L-shape. ### Claim 7 (depends on 3) The clamping device of claim 3, wherein a gap is formed between the sidewall and the clamping body when the clamping device Is in the closed configuration. ### Claim 8 (depends on 1) The clamping device of claim 1, further comprising at least one lateral spring that provides a portion of the bias by laterally pushing against laterally adjacent shroud portions. ### Claim 9 (depends on 1) The clamping device of claim 1, further comprising at least one longitudinal spring that provides a portion of the bias by laterally pushing against longitudinally adjacent shroud portions. ### Claim 10 (depends on 1) The clamping device of claim 1, wherein a coordinated, inward motion of the shroud portions occurs under the actuating force in a manner to cause a coordinated, lateral motion of the shroud portions that is diagonally inward. ### Claim 11 (depends on 1) The clamping device of claim 1, wherein a shroud portion includes at least one elongated slot that houses a shaft that helps to couple the actuating member, the clamping shroud, and the clamping body together. ### Claim 12 (depends on 11) The clamping device of claim 11, wherein the elongated slot includes an inner end and an outer end, and wherein the inner and outer ends of the elongated slot function as stops for the shaft so that the range of motion of the shroud portion has an inner limit and an outer limit. ### Claim 13 (depends on 1) The clamping device of claim 1, wherein a shroud portion comprises a bearing assembly mounted in a pocket, and wherein the actuating member comprises a complementary driving element that engages the bearing assembly in a manner effective to convert a portion of the axial clamping force into an inward, lateral motion of the shroud portion. ### Claim 14 (depends on 13) The clamping device of claim 13, wherein the driving element comprises a ramp that engages the bearing assembly. ### Claim 15 (depends on 13) The clamping device of claim 13, wherein the bearing assembly comprises a u-shaped yoke body. ### Claim 16 (depends on 15) The clamping device of claim 15, wherein the yoke body comprises a backside and a chamfer on the backside, wherein the chamfer helps to provide a friction fit between the bearing assembly and the pocket. ### Claim 17 (depends on 13) The clamping device of claim 13, wherein the bearing assembly further comprises a bias member that helps to pressure a bearing surface of the bearing assembly against the driving element. ### Claim 18 (depends on 1) The clamping device of claim 1, wherein a low friction sheet is interposed between the shroud portion and the clamping body in order to reduce friction during relative lateral motion between the shroud portion and the clamping body. ### Claim 19 (depends on 1) The clamping device of claim 1, wherein a plurality of shafts couple the clamping body to the actuating member, and wherein the shafts pass through elongated slots in the shroud portions. ### Claim 20 (depends on 1) The clamping device of claim 1, wherein the shafts fixedly couple the clamping body to the actuating member such that the clamping body and the actuating member move axially together.