# US 9,752,605 B2 · Load release means for telescopic props > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,605 B2 - Document ID: US9752605B2 - Status: Granted - Kind: B2 - Application number: 14/781,212 - Filed: 2014-04-11 - Published: 2016-02-04 - Granted: 2017-09-05 - Earliest claimed: 2013-04-12 - Assignees: Brand Energy & Infrastructure Services LTD - Applicants: Brand Energy & Infrastructure Services LTD - Inventors: Demetrios Georgiou Papadopoulos - Web page: https://patentgrep.com/patent/US9752605B2 ## CPC - F16B 7/06: Turnbuckles (for cables, ropes, or wire F16G11/12) - E04G 25/065: {by a threaded nut} - F16B 7/182: {for coaxial connections of two rods or tubes} - F16B 33/02: Shape of thread; Special thread-forms ({F16B25/00 takes precedence; used to remove paint or dirt layers F16B35/007, F16B37/002}; used as screw-locking device F16B39/30) - F16B 39/16: in which the screw-thread of the locknut differs from that of the nut - F16M 11/26: by telescoping, with or without folding (details concerning the constructional features of telescoping parts only F16B7/10) - F16B 5/0275: {the screw-threaded element having at least two axially separated threaded portions (F16B5/0283 takes precedence)} - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS - F16M: FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS ## Abstract A load release means for a telescopic prop, the load release means comprising: an inner member with at least one threaded portion; a striking collar with threaded internal bore configured to threadedly engage with the threaded portion of the inner member through a thread interface; and, locking means to releasably secure said striking collar on said inner member, whereby, in use, when an applied load V acts directly on the thread interface, the component force S of the applied load V provides most or all of the striking torque such that when the locking means is released little to no external torque is required to be applied to the striking collar to strike the striking collar. ## Claims ### Claim 1 A load release device for a telescopic prop, the load release device comprising: an inner member with at least one threaded portion, said threaded portion comprising a helix angle A; a striking collar with a threaded internal bore configured to threadedly engage with the threaded portion of the inner member through a thread interface, said threaded bore also comprising the helix angle A, wherein the striking collar is configured to rotate relative to the inner member during striking; and a locking means to releasably secure said striking collar at a location along said inner member, whereby the helix angle A is substantially equal to a critical helix angle A1 such that, when the locking means is released, substantially no external torque is required to be applied to the striking collar to have the striking collar rotate relative to the inner member during striking. ### Claim 2 (depends on 1) A load release device according to claim 1, wherein the locking means comprises a retention collar with threaded internal bore configured to engage with a second threaded portion of the inner member, whereby, in use, the retention collar releasably secures the striking collar in position. ### Claim 3 (depends on 2) A load release device according to claim 2, wherein the striking collar and the retention collar are releasably joined to each other, whereby rotation of said retention collar rotates the striking collar on their respective threaded portions. ### Claim 4 (depends on 3) A load release device according to claim 3, wherein the striking collar incorporates at least one protrusion configured to engage with at least one recess in the retention collar at the interface between the striking collar and the retention collar. ### Claim 5 (depends on 3) A load release device according to claim 3, wherein the retention collar incorporates at least one protrusion configured to engage with at least one recess in the striking collar at the interface between the retention collar and the striking collar. ### Claim 6 (depends on 4) A load release device according to claim 4, wherein the at least one protrusion comprises a continuous lip, and the at least one recess comprises a continuous groove. ### Claim 7 (depends on 1) A load release device according to claim 1, wherein the threaded internal bore of the striking collar and corresponding threaded portion of the inner member comprise a multiple start thread. ### Claim 8 (depends on 2) A load release device according to claim 2, wherein the striking collar and the retention collar are separated by a compliant material. ### Claim 9 (depends on 8) A load release device according to claim 8, wherein the compliant material comprises at least one spring washer. ### Claim 10 (depends on 2) A load release device according to claim 2, wherein the striking collar and the retention collar are separated by a low friction material. ### Claim 11 (depends on 10) A load release device according to claim 10, wherein the low friction material is PTFE. ### Claim 12 (depends on 9) A load release device according to claim 9, wherein a compliant material is incorporated alongside the low friction material. ### Claim 13 (depends on 1) A load release device according to claim 1, wherein the striking collar incorporates at least one handle to facilitate rotation of said striking collar. ### Claim 14 (depends on 2) A load release device according to claim 2, wherein the retention collar incorporates at least one handle to facilitate rotation of said retention collar. ### Claim 15 (depends on 1) A load release device according to claim 1, wherein the striking collar incorporates at least one circumferential groove to support an outer member that is telescopically received on the striking collar, preventing separation under tension of said outer member to said striking collar. ### Claim 16 (depends on 1) A load release device according to claim 1, wherein the inner member comprises a threaded bore to threadedly engage with an inner leg of the telescopic prop. ### Claim 17 (depends on 1) A load release device according to claim 1, wherein the inner member comprises a tube with a diameter greater than the outer diameter of the inner leg of the telescopic prop for retrofitting on to an adjusting collar of the inner leg of the telescopic prop. ### Claim 18 (depends on 1) A telescopic prop incorporating the load release means of claim 1. ### Claim 19 (depends on 1) The load release device of claim 1 wherein, when the locking means is secured, the load is supported by the striking collar and locking means. ### Claim 20 A load releasing device comprising: an inner member with at least one threaded portion, said threaded portion comprising a helix angle A; a striking collar with a threaded internal bore configured to threadedly engage with the threaded portion of the inner member through a thread interface, said threaded bore also comprising the helix angle A, wherein the striking collar is configured to rotate relative to the inner member during striking; and a lock to releasably secure said striking collar at a location along said inner member, whereby the helix angle A is substantially equal to a critical helix angle A1 such that, when the lock is released, substantially no external torque is required to be applied to the striking collar to have the striking collar rotate relative to the inner member during striking.