# US 5,341,669 A · Rotary bending tool with continuous lubrication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,341,669 A - Document ID: US5341669A - Status: Granted - Kind: A - Application number: 08/015,538 - Filed: 1993-02-08 - Granted: 1994-08-30 - Earliest claimed: 1992-02-08 - Assignees: READY Tools, Inc. - Inventors: Wolfgang Katz - Web page: https://patentgrep.com/patent/US5341669A ## CPC - B21D 5/042: {With a rotational movement of the bending blade} - B21D 5/0209: {Tools therefor} - B21D 37/18: Lubricating {, e.g. lubricating tool and workpiece simultaneously (lubricating workpieces for deep-drawing B21D22/201)} - B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F) ## Abstract A rotary bending tool, consisting of a rotary bending head, a saddle block with bearing surfaces and retaining key for holding the rotary bending head, a restoring member for the rotary bending head and a bottom die, the bearing assembly of the rotary bending head being equipped with a continuous lubricating device. The continuous lubricating device consists preferably of lubricant chambers, which are fed via a lubricant-delivery duct. Preferably the restoring member for the rotary bending head is integrated in the lubricant-delivery duct. ## Claims ### Claim 1 A rotary bending tool comprising: a saddle block having cylindrical bearing surfaces, a rotary bending head having cylindrical surfaces journalled by the cylindrical bearing surfaces of said saddle block, a retaining key carried by said saddle block having a bearing surface for retaining said rotary bending head, a member in said saddle block for restoring said rotary bending head to an initial position after rotation thereof in said saddle block, a die for engagement by a component to be deformed by said rotary bending head, at least one lubricant chamber in said saddle block in fluid communication with said bearing surfaces and having an extension to an exterior surface of said saddle block to enable lubricant to be introduced into said lubricant chamber from the exterior of said bending tool, and a plug in said saddle block for closing said extension of said lubricant chamber. ### Claim 2 (depends on 1) The rotary bending tool as claimed in claim 1, said extension comprising a lubricant delivery duct in fluid communication with each said lubricant chamber. ### Claim 3 (depends on 1) The rotary bending tool as claimed in claim 1, wherein said at least one lubricant chamber extends substantially over the entire axial length of said cylindrical bearing surfaces. ### Claim 4 (depends on 3) The rotary bending tool as claimed in claim 3, there being a plurality of said extension in said saddle block in fluid communication with said at least one lubricant chamber. ### Claim 5 (depends on 4) The rotary bending tool as claimed in claim 4, wherein said saddle block has multiple lubricant chambers therein in fluid communication with said extensions. ### Claim 6 (depends on 1) The rotary bending tool as claimed in claim 1, said plug having a spring-urged ball valve therein to retain lubricant in said extension and to permit lubricant to be forced into said extension. ### Claim 7 (depends on 1) The rotary bending tool as claimed in claim 1, wherein each said lubricant chamber extends along the axial length of said rotary bending head, and a central extension being in fluid communication with each said lubricant chamber. ### Claim 8 (depends on 1) The rotary bending tool as claimed in claim 1, wherein said restoring member comprises a plunger in engagement with a surface of said bending tool and a spring urging said plunger against said surface of said bending tool. ### Claim 9 A rotary bending tool comprising: a saddle block having cylindrical bearing surfaces, a rotary bending head having cylindrical surfaces journalled by the cylindrical bearing surfaces of said saddle block, a retaining key carried by said saddle block having a bearing surface for retaining said rotary bending head, a member in said saddle block for restoring said rotary bending head to an initial position after rotation thereof in said saddle block; a die for engagement by a component to be deformed by said rotary bending head, at least one lubricant chamber in said saddle block in fluid communication with said bearing surfaces and having an extension to an exterior surface of said saddle block, and fluid lubricant located in said lubricant chamber. ### Claim 10 (depends on 9) The rotary bending tool as claimed in claim 9, said extension comprising a lubricant delivery duct in fluid communication with each said lubricant chamber. ### Claim 11 (depends on 9) The rotary bending tool as claimed in claim 9, wherein said at least one lubricant chamber extends substantially over the entire axial length of said cylindrical bearing surfaces. ### Claim 12 (depends on 11) The rotary bending tool as claimed in claim 11, there being a plurality of said extensions in said saddle block in fluid communication with said at least one lubricant chamber. ### Claim 13 (depends on 12) The rotary bending tool as claimed in claim 12, wherein said saddle block has multiple lubricant chambers therein in fluid communication with said extensions. ### Claim 14 (depends on 9) The rotary bending tool as claimed in claim 9, wherein each said lubricant chamber extends along the axial length of said rotary bending head, and a central extension being in fluid communication with each said lubricant chamber. ### Claim 15 (depends on 9) The rotary bending tool as claimed in claim 9, wherein said restoring member comprises a plunger in engagement with a surface of said bending tool and a spring urging said plunger against said surface of said bending tool.