# US 2016/0354873 A1 · Apparatus for supporting backing member in enclosed structures > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0354873 A1 - Document ID: US20160354873A1 - Status: Published application - Kind: A1 - Application number: 14/730,322 - Filed: 2015-06-04 - Published: 2016-12-08 - Earliest claimed: 2015-06-04 - Assignees: Caterpillar Inc. - Applicants: Caterpillar Inc. - Inventors: Huijun Wang; Danny L. McCaherty; Yan Shao; Kendall R. Powell; David R. Griffith - Web page: https://patentgrep.com/patent/US20160354873A1 ## CPC - B23K 9/32: Accessories - B23K 9/035: with backing means disposed under the seam - 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 ## Abstract An apparatus for supporting a backing member in an enclosed structure is disclosed. The enclosed structure includes a first plate defining an opening therethrough. The apparatus is configured to be disposed within the enclosed structure. The apparatus includes a clamp member and a support member configured to rotatably support the clamp member. The clamp member is rotatable about a rotation axis defined by the support member. The support member is further configured to abut a second plate spaced apart from the first plate. The clamp member is configured to be moved along the rotation axis relative to the support member and bias the backing member to contact with the first plate along the opening. ## Claims ### Claim 1 An apparatus for supporting a backing member for welding a first plate of an enclosed structure, the first plate defining an opening therethrough, the apparatus configured to be disposed within the enclosed structure, the apparatus comprising: a clamp member; and a support member configured to rotatably support the clamp member, wherein the clamp member is rotatable about a rotation axis defined by the support member, the support member further configured to abut a second plate spaced apart from the first plate; wherein the clamp member is configured to be moved along the rotation axis relative to the support member and bias the backing member to contact with the first plate along the opening. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the clamp member comprises: a base; a first arm extending from the base in a first direction, the first arm defining a first abutment surface configured to abut the backing member; a second arm extending from the base in a second direction opposite to the first direction, the second arm defining a second abutment surface configured to abut the backing member; and an elongate member extending from the base and configured to be rotatably received within the support member. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the base defines a cutout to engage with an alignment tool received through the opening. ### Claim 4 (depends on 2) The apparatus of claim 2 further comprising a spring member disposed between the clamp member and the support member, the spring member configured to bias the clamp member along the rotation axis. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the clamp member further comprises a first flange and the support member comprises a second flange, and wherein the spring member is supported between the first flange and the second flange. ### Claim 6 (depends on 2) The apparatus of claim 2 further comprising a plurality notches defined on the first abutment surface of the first arm and the second abutment surface of the second arm. ### Claim 7 A system for welding a first plate of an enclosed structure, the first plate defining an opening therethrough, the system configured to be disposed within the enclosed structure, the system comprising: a backing member defining a first surface and a second surface distal to the first surface; and an apparatus for supporting the backing member, the apparatus comprising: a clamp member configured to abut the second surface of the backing member, wherein the first surface of the backing member is configured to abut the first plate; and a support member configured to rotatably support the clamp member, wherein the clamp member is rotatable about a rotation axis defined by the support member, the support member further configured to abut a second plate spaced apart from the first plate; wherein the clamp member is configured to be moved along the rotation axis relative to the support member and bias the backing member to contact with the first plate along the opening. ### Claim 8 (depends on 7) The system of claim 7, wherein the backing member comprises a first through hole configured to receive an alignment tool therethrough. ### Claim 9 (depends on 7) The system of claim 7, wherein the backing member comprises a plurality of second through holes spaced from each other to receive a string therethrough. ### Claim 10 (depends on 7) The system of claim 7, wherein the clamp member comprises: a base; a first arm extending from the base in a first direction, the first arm defining a first abutment surface configured to abut the backing member; a second arm extending from the base in a second direction opposite to the first direction, the second arm defining a second abutment surface configured to abut the backing member; and an elongate member extending from the base and configured to be rotatably received within the support member. ### Claim 11 (depends on 10) The system of claim 10, wherein the base defines a cutout to engage with an alignment tool received through the opening. ### Claim 12 (depends on 10) The system of claim 10 further comprising a spring member disposed between the clamp member and the support member, the spring member configured to bias the clamp member along the rotation axis. ### Claim 13 (depends on 12) The system of claim 12, wherein the clamp member further comprises a first flange and the support member comprises a second flange, and wherein the spring member is supported between the first flange and the second flange. ### Claim 14 (depends on 10) The system of claim 10 further comprising a plurality notches defined on the first abutment surface of the first arm and the second abutment surface of the second arm. ### Claim 15 A method of supporting a backing member in an enclosed structure having a first plate and a second plate spaced apart from the first plate, the method comprising: defining an opening in the first plate, the opening having a longitudinal axis; inserting an apparatus, at a first orientation thereof, within the enclosed structure through the opening, the apparatus comprising a clamp member and a support member configured to rotatably support the clamp member, wherein, in the first orientation, the clamp member is aligned with the longitudinal axis of the opening; disposing the support member of the apparatus on the second plate; rotating the apparatus to a second orientation thereof about a rotation axis perpendicular to the longitudinal axis, wherein, in the second orientation, the clamp member is oriented at an angle with respect to the longitudinal axis of the opening; inserting a backing member through the opening within the enclosed structure; aligning the backing member with the longitudinal axis of the opening to at least partially close the opening from inside of the enclosed structure; and rotating the apparatus about the rotation axis to move the apparatus to the first orientation thereof to support the backing member on the clamp member. ### Claim 16 (depends on 15) The method of claim 15 further comprising: moving, via an alignment tool, the clamp member away from the first plate along the rotation axis against a biasing force of a spring member, wherein the spring member is disposed between the clamp member and the support member; and rotating, via the alignment tool, the clamp member about the rotation axis to move the apparatus to the second orientation. ### Claim 17 (depends on 16) The method of claim 16 further comprising holding the backing member, in a first position thereof, by a string, wherein the string is inserted through a plurality of second through holes defined in the backing member, and wherein, in the first position, the backing member is oriented perpendicular to the longitudinal axis. ### Claim 18 (depends on 17) The method of claim 17, wherein aligning the backing member with the longitudinal axis of the opening further comprises: allowing the backing member to move from the first position to a second position, wherein, in the second position, the backing member is aligned with the opening; and moving, via the string, the backing member towards the first plate along the rotation axis to contact the backing member with the first plate. ### Claim 19 (depends on 18) The method of claim 18 further comprising: inserting the alignment tool through a first through hole defined in the backing member; engaging the alignment tool with a cutout defined in the clamp member; moving the clamp member away from the first plate along the rotation axis against the biasing force of the spring member; and rotating the clamp member to move the apparatus to the first orientation thereof to bias the backing member against the first plate. ### Claim 20 (depends on 19) The method of claim 19 further comprising closing the first through hole defined in the backing member via an insert.