HEDGE TRIMMER ASSEMBLY

• US 3,798,768 A
• Filed: 07/14/1972
• Issued: 03/26/1974
• Est. Priority Date: 07/14/1972
• Status: Expired due to Term

• Current Assignee: Robert E. Stutzke, William C. Cowley
• Original Assignee: Robert E. Stutzke, William C. Cowley
• Inventors: Cowley, William C., Stutzke, Robert E.
• Primary Examiner(s): Kelly, Donald G.
• Assistant Examiner(s): Peters, J. C.
• Application Number:
  US05/271,930
• Time in Patent Office: 620 Days
• Field of Search: 30/210,215,216,217,218,220,221,222,223,224,225
• US Class Current: 30/223
• CPC Class Codes: A01G 3/053 motor-driven

Abstract

The cutting blade of a hedge trimmer slides between rigidly bolted stationary guard and overlying cover plates in which portions of the stationary guard about its bolt apertures have been pressed into projections which project through slotted apertures of the cutting blade to engage the cover plate, the concave underside of the pressed projections being shaped to resist turning of the nuts on the bolts.

Claims

1. In a hedge trimmer or the like having drive means for reciprocating a cutting blade relative to a stationary guard and a cover plate between which the cutting blade is slidably assembled, the improvement wherein the cutting blade has at least one elongated slot with generally parallel sides extending longitudinally of the blade, one of the said stationary guard and cover plate having an apertured projection pressed therefrom to the form of a raised outer side and recessed underside, said projection extending into said slot and having a height only slightly greater than the thickness of the cutting blade, the thickness of the projection between its raised outerside and recessed underside being no greater than the thickness of the one of said stationary guard and cover plate from which it is pressed and said projection further having a width and a length less than the corresponding width and length of said slot in the cutting blade, the other of said stationary guard and cover plate having an aperture which aligns with the aperture of said projection, and a connector element extending through said apertures rigidly securing the cover plate to the stationary guard, the cutter blade being free to axially slide therebetween.

2. The improvement of claim 1 wherein the projection has a width only slightly less than the width of the slot and a length considerably less than the length of the slot.

3. The improvement of claim 2 wherein the lateral sides of the projection are generally parallel to each other and normal to the plane of the surface from which it projects.

4. The improvement of claim 1 wherein the connector element comprises a bolt and the recessed underside of the projection includes a non-circular shaped seat which receives a nut into which the threaded stem of the bolt is threadedly connected to resist turning of the nut.

5. The improvement of claim 1 wherein the cutting blade has a plurality of axially aligned slots spaced longitudinally thereof and the stationary guard has one such projection extending through each said slots, each said projections having a concave underside.

6. The improvement of claim 5 wherein each said projections has a width only slightly less than the width of the slot which receives the same and a length considerably less than the length of the said slot.

7. The improvement of claim 5 wherein the two lateral sides of each said projections are generally parallel with each other and the sides of the other projections and generally normal to the plane of the stationary guard surface from which they project.

8. The improvement of claim 5 wherein a bolt extends through aligned apertures in the cover plate and projections of the stationary guard and a nut is tightened on the threaded end of the bolt which projects into the concave underside of the projections.

9. The improvement of claim 8 wherein the concave underside of the projections includes wall portions which resist turning of the nut when tightened on the threaded end of the bolt.