# US 11,298,805 B2 · Torque assembly and reaction arm with safety tether > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,805 B2 - Document ID: US11298805B2 - Status: Granted - Kind: B2 - Application number: 16/618,527 - Filed: 2018-06-01 - Published: 2020-05-28 - Granted: 2022-04-12 - Earliest claimed: 2017-06-02 - Assignees: Enerpac UK Ltd - Applicants: Enerpac UK Ltd - Inventors: Mike Johnson - Web page: https://patentgrep.com/patent/US11298805B2 ## CPC - B25B 21/005: {driven by a radially acting hydraulic or pneumatic piston} - B25B 23/0078: {Reaction arms} - B25B 13/481: {for operating in areas having limited access} - B25B 21/007: {Attachments for drilling apparatus for screw or nut setting or loosening} - B25B 23/0035: {Connection means between socket or screwdriver bit and tool} - B25B 23/14: Arrangement of torque limiters or torque indicators in wrenches or screwdrivers (couplings for transmitting rotation or clutches F16D; devices for measuring torque per se G01L) - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING ## Abstract A torque wrench assembly comprises a torque wrench and a reaction arm and locking means for locking together the torque wrench and the reaction arm. The locking means comprises a connection member located on the torque wrench; an opening on the reaction arm for receipt of the connection member of the torque wrench; a locking member slidably mounted in a channel on the reaction arm, the locking member including an aperture sized to allow the connection member to pass therethrough; and biasing means arranged to bias the locking member into a position wherein the aperture is partially aligned with the opening. The connection member has an insertion end for insertion into the opening of the reaction arm, and immediately adjacent the insertion end is a recess. The recess is shaped to receive a part of the locking member. ## Claims ### Claim 1 A torque wrench assembly comprising a torque wrench, a reaction arm and a tether having a first end and a second end, the first end attached to the torque wrench and wherein the reaction arm includes an aperture and the tether passes through the aperture and wherein the second end of the tether comprises a stop member, at least a part of the stop member being wider than the aperture, and wherein the reaction arm is slidable relative to and rotatable about the tether when released from the torque wrench. ### Claim 2 (depends on 1) A torque wrench assembly according to claim 1, wherein the tether comprises a flexible elongate element and the stop member is attached to the flexible element. ### Claim 3 (depends on 1) A torque wrench assembly according to claim 1, wherein the flexible element is comprised of a wire rope. ### Claim 4 (depends on 1) A torque wrench assembly according to claim 1, wherein the stop member comprises first and second components, releasably attachable to each other, and wherein one of the first and second components is so shaped and dimensioned as to pass through the aperture and the other of the first and second components is wider than the aperture. ### Claim 5 (depends on 1) A torque wrench assembly according to claim 1, wherein the first end of the tether includes a connection member. ### Claim 6 (depends on 5) A torque wrench assembly according to claim 5, wherein the connection member is releasably attachable to the torque wrench. ### Claim 7 (depends on 6) A torque wrench assembly according to claim 6, wherein the connection member includes a recess configured to receive a slidably mounted locking member of the reaction arm. ### Claim 8 (depends on 1) A torque wrench assembly according to claim 1, wherein the reaction arm includes a wall having a circular cross section the wall including a seat configured to receive a ring, wherein the ring rotatable around the said wall of the reaction arm, and wherein the ring includes an attachment element. ### Claim 9 A reaction arm that is attachable to a torque wrench, wherein the reaction arm includes a wall having a circular cross section the wall including a seat configured to receive a ring, wherein the ring rotatable around the said wall of the reaction arm, and wherein the ring includes an attachment element. ### Claim 10 (depends on 9) A reaction arm according to claim 9, wherein the attachment element is adapted to attach to a tether, clip or the like. ### Claim 11 (depends on 10) A reaction arm according to claim 10, wherein the attachment element is a shackle. ### Claim 12 (depends on 9) A reaction arm according to claim 9, wherein the ring comprises two parts, wherein the two parts are joined together by a hinge at one side and by a releasable fastener at the other side. ### Claim 13 (depends on 9) A reaction arm according to claim 9, wherein the releasable fastener forms part of the shackle. ### Claim 14 (depends on 13) A reaction arm according to claim 13, wherein the shackle includes a shackle body and a shackle pin and the releasable fastener is the shackle pin. ### Claim 15 (depends on 9) A reaction arm according to claim 9, wherein the seat is a groove formed in or on the wall of the reaction arm. ### Claim 16 (depends on 15) A reaction arm according to claim 15, wherein the seat is formed as a recess in the wall of the reaction arm or by spaced apart up stands formed on the wall of the reaction atm. ### Claim 17 (depends on 9) A reaction arm according to claim 9, wherein an elongate attachment member is attached to the attachment element of the reaction arm at a first end, a second end of the elongate attachment member attachable to another object. ### Claim 18 (depends on 9) A torque wrench assembly comprising a torque wrench, and a reaction arm according to claim 9.