# US 5,704,407 A · Tree delimbing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,407 A - Document ID: US5704407A - Status: Granted - Kind: A - Application number: 08/714,186 - Filed: 1996-09-16 - Granted: 1998-01-06 - Earliest claimed: 1996-09-16 - Inventors: Thomas E. Hamby, Jr. - Web page: https://patentgrep.com/patent/US5704407A ## CPC - A01G 23/097: having a fixed delimbing head - Y10T 83/538: Positioning of tool controlled - Y10T 83/541: Actuation of tool controlled in response to work-sensing means - A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A tree delimbing device having a self-aligning cutter head for delimbing a tree stem which is mounted on a frame by a rotational and pivotal support. A substantially inelastic flexible member connects the cutter head to the frame to limit movement of the cutter head. A medial portion of the flexible member is connected to a fluid cylinder so as to urge the cutter head toward a centered position. An accumulator may be provided for regulating the pressure of the fluid in the cylinder. The positioning of the fluid cylinder may be adjustable. A tree stem diameter measuring device having a sliding position indicator may also be provided. A tree stem detector may also be included to sense the presence of a tree stem placed within the cutter head for automatically closing and opening the blades around the stem. A removable mount for the cutter head is also included. ## Claims ### Claim 1 A tree delimbing device having a self-aligning cutter head, comprising: a frame; a cutter head having limb cutting and stripping means for delimbing a tree stem; means mounted on said frame for supporting said cutter head for rotational and pivotal movement so as to maintain said cutter head in substantial alignment with a longitudinal axis of a tree stem during delimbing; a substantially inelastic flexible member having a first end connected to said frame and a second end connected to said cutter head, said flexible member having a desired length for limiting the pivotal and rotational movement of said cutter head; and an extensible fluid piston cylinder reaching between said frame and a medial portion of said flexible member for exerting a tensile force on said flexible member to urge said cutter head toward a centered position. ### Claim 2 (depends on 1) A tree delimbing device according to claim 1 further comprising a fluid accumulator in communication with said extensible piston cylinder for regulating and maintaining the pressure and volume of a fluid within said cylinder. ### Claim 3 (depends on 2) A tree delimbing device according to claim 2 wherein said fluid cylinder and fluid accumulator contain a hydraulic fluid. ### Claim 4 (depends on 3) A tree delimbing device according to claim 3 further comprising means for adjusting the fluid pressure maintained by said accumulator. ### Claim 5 (depends on 1) A tree delimbing device according to claim 1 wherein said means mounted on said frame for supporting said cutter head for rotational and pivotal movement includes a base plate supported on a rotating frame mounting plate interconnected to a pivot plate by a rotational bearing member. ### Claim 6 (depends on 1) A tree delimbing device according to claim 1 wherein pivoting movement of said cutter head is further limited by a vertical stop member. ### Claim 7 (depends on 1) A tree delimbing device according to claim 1 wherein said flexible member is a chain. ### Claim 8 (depends on 1) A tree delimbing device according to claim 1 further comprising means for adjusting the mounting position of said extensible piston cylinder on said frame. ### Claim 9 (depends on 1) A tree delimbing device according to claim 1 wherein said cutter head is removably mounted to said frame with an axle that is pivotably connected to a saddle and which is secured to the saddle by a nut received on said axle. ### Claim 10 A tree delimbing device having a self-aligning cutter head, comprising: a frame; a cutter head having at least one limb cutting and stripping blade for delimbing a tree stem; a pivotal and rotational cutter head support mounted on said frame; a flexible member having a first end connected to said frame and a second end connected to said cutter head, for limiting the pivotal and rotational movement of said cutter head; an extensible piston cylinder containing hydraulic fluid and reaching between said frame and a medial portion of said flexible member for exerting a tensile force on said flexible member to urge said cutter head toward a centered position; and means in communications with said extensible piston cylinder for regulating the pressure and volume of hydraulic fluid within said cylinder. ### Claim 11 (depends on 10) A tree delimbing device according to claim 10 wherein said means for regulating the pressure of hydraulic fluid comprises a hydraulic accumulator. ### Claim 12 (depends on 11) A tree delimbing device according to claim 11 wherein said flexible member comprises a chain. ### Claim 13 (depends on 12) A tree delimbing device according to claim 12 further comprising a vertical stop member for further limiting pivoting movement of said cutter head and lateral stop members for further limiting rotational movement of said cutter head. ### Claim 14 (depends on 10) A tree delimbing device according to claim 10 wherein said extensible piston cylinder is attached to said frame by an adjustable mount. ### Claim 15 A tree delimbing device having a self-aligning cutter head, comprising: a frame; a cutter head having limb cutting and stripping means for delimbing a tree stem; means mounted on said frame for supporting said cutter head for rotational and pivotal movement so as to maintain said cutter head in substantial alignment with a longitudinal axis of a tree stem during delimbing; means for limiting the rotational and pivotal movement of said cutter head and for urging said cutter head toward a centered position, said means being mounted on said frame and said cutter head at three positions and including a flexible member extending between two of said mounting positions, and an extensible hydraulic piston cylinder reaching from one of said mounting positions to a medial point on said flexible member, such that said piston cylinder may exert a force on said flexible member to urge the ends thereof toward one another. ### Claim 16 A tree delimbing device comprising: a cutter head defining a path for receiving a tree stem for delimbing; limb cutting and stripping means mounted on said cutter head, said cutting and stripping means being movable between an open position for allowing a tree stem to be placed within said cutter head and a closed position for delimbing; means for moving said limb cutting and stripping means between said open position and said closed position; a cam rotatably mounted on said cutter head; a probe connected to said cam which is moved by contact with a tree stem received within said path; and a plunger valve in contact with said cam and being movable between an open and a closed position.