Branch cutter tool

• US 6,044,564 A
• Filed: 04/14/1997
• Issued: 04/04/2000
• Est. Priority Date: 04/27/1996
• Status: Expired due to Fees

• Current Assignee: J. Wagner GmbH
• Original Assignee: J. Wagner GmbH
• Inventors: Jeltsch, Thomas
• Primary Examiner(s): Rachuba, M.
• Assistant Examiner(s): Goodman, Charles
• Application Number:
  US08/834,485
• Time in Patent Office: 1,086 Days
• Field of Search: 30/228, 30/247, 30/249, 30/245, 30/246, 30/250, 30/251
• US Class Current: 30/228
• CPC Class Codes: A01G 3/037 the driving means being an electric motor

Abstract

A branch cutter tool (1) having two blades (11,12) that are movable in relation to each other, of which one blade (11) is rigidly connected with a housing (2) and the other blade (12) can be moved by an electric motor (5) via a threaded spindle (8), a threaded nut (21) arranged on the threaded spindle and a rod assembly connected to the threaded nut. The blade (11) has an extension (13) projecting into the housing (2) and the threaded spindle (8) is rotatably supported by means of a rolling bearing (31) which is fixed to the threaded spindle (8) and is axially supported in a recess (17) formed into the extension (13) such that the cutting forces taking place in a cutting operation are absorbed by the components involved so that the housing (2) is not subjected to stress by these forces. The tensile forces transferred to the threaded spindle (8) when the movable blade (12) is closed are applied to the extension (13) via the rolling bearing (31). Furthermore, a force acts upon the extension in the opposite direction in the region of the bearing support of the movable blade (12) so that these forces thus cancel each other out and a closed power flux results.

Claims

1. A branch cutter tool (1) having:

a first blade (11) and a second blade (12) that are movable in relation to each other;

a housing (2) having an axial direction and wherein the first blade (11) is rigidly connected to the housing (2);

an electric motor (5) having a circuit and located in the housing;

a threaded spindle having an end region which faces away from the electric motor and which is rotatable by the electric motor for moving the second blade,

a threaded nut (21) arranged on the threaded spindle and supported so as to be non-rotating; and

a rod assembly connected to the threaded nut (21);

wherein

a rolling bearing (31) is fixedly arranged on the threaded spindle (8) in the axial direction of the housing;

the first blade connected with the housing (2) includes an extension (13) having a recess (17) formed therein which projects into the housing (2) along a direction of the threaded spindle (8); and

the end region of the threaded spindle (8) facing away from the electric motor (5) is rotatably supported in the rolling bearing (31) and is supported in the recess (17) formed into the extension (13).

2. The tool of claim 1, further including a plurality of non-rotating lugs (24,25), and grooves (26,27) provided in the housing (2) wherein the threaded nut (21) is guided movably in the axial direction of the housing by the plurality of non-rotating lugs (24,25) which project into the grooves (26,27) provided in the housing (2).

3. The tool of claim 2, wherein the rod assembly connecting the threaded spindle (8) with the second blade (12) is formed by two levers (28,29) that are guided laterally past the rolling bearing (31) and the extension (13) of the first blade (11), and are coupled to the threaded nut (21) and the second blade (12).

4. The tool of claim 3, wherein each of the two levers (28,29) includes a recess (36) and an outer surface of the threaded nut (21) is provided with at least one pair of projections (22,23) each of which engage one of the recesses (36) formed in the levers (28,29) in order to couple the levers (28,29) to the threaded nut (21).

6. The tool of claim 1, wherein the rod assembly connecting the threaded spindle (8) with the second blade (12) is formed by two levers (28,29) that are guided laterally past the rolling bearing (31) and the extension (13) of the first blade (11), and are coupled to the threaded nut (21) and the second blade (12).

7. The tool of claim 4, wherein each of the two levers (28,29) includes a recess (36) and an outer surface of the threaded nut (21) is provided with at least one pair of projections (22, 23) each of which engage one of the recesses (36) formed in the levers (28,29) in order to couple the levers (28,29) to the threaded nut (21).

8. The tool of claim 7 wherein the projections (22,23) are rounded.

9. The tool of claim 7 wherein the levers (28,29) have enlarged portions forming brackets (35) surrounding the recesses (36).

5. The tool of claim 5, wherein the projections (22,23) are rounded.