Power operated rotary knife with notched rotary knife blade and trim guide

Patent metadata

Field	Value
Publication number	US-10343296-B2
Application number	US-201615216120-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Jul 25, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A combination of a rotary knife blade and a trim guide for a power operated rotary knife. The annular rotary knife blade supported for rotation about a central axis of rotation in a direction of rotation and rotating with respect to the trim guide, the knife blade including a blade section extending from an annular body, the lower end of the blade section defining a plurality of circumferentially spaced apart notches including an opening at the lower end and a central open portion defined by a peripheral wall, the peripheral wall including an arcuate cutting portion adjacent the lower end of the blade section. The trim guide including a guide section defining a plurality of circumferentially spaced apart notches extending from a lower end, each of the plurality of notches including a shearing portion in overlapping axial alignment with the arcuate cutting portions of the blade section.

First claim

What is claimed is:

1. A power operated rotary knife comprising:
an annular rotary knife blade supported for rotation about a central axis of rotation in a direction of rotation and rotating with respect to a trim guide, the knife blade including an annular body including an inner wall and an outer wall and an upper end and a lower end, the annular body of the rotary knife blade including a bearing surface for rotational support of the rotary knife blade and a driven gear for rotationally driving the rotary knife blade, the rotary knife blade further including a blade section extending from the lower end of the annular body, the blade section including a blade frustoconical wall extending between an upper end of the blade section and a lower end of the blade section, the lower end of the blade section spaced radially inwardly from and axially below the upper end of the blade section, a plurality of circumferentially spaced apart notches extending from the lower end of the blade section into the blade frustoconical wall, each of the plurality of notches including a peripheral wall surrounding a central open portion, the peripheral wall including a cutting portion, the cutting portion of each of the plurality of circumferentially spaced apart notches defining a cutting edge of the rotary knife blade; and
the trim guide including a base and a guide section extending radially inwardly and axially downwardly from the base, the guide section extending axially below and being adjacent to the blade section of the rotary knife blade and including a guide frustoconical wall extending between an upper end of the guide section and a lower end of the guide section, the lower end of the guide section spaced radially inwardly from the upper end, a plurality of circumferentially spaced apart notches extending from the lower end of the guide section into the guide frustoconical wall, each of the plurality of notches including a peripheral wall surrounding a central open portion, the peripheral wall including a shearing portion, the shearing portion in overlapping axial alignment with the cutting portions of the plurality of notches of the blade section of the rotary knife blade as the rotary blade rotates about the central axis of rotation.

2. The power operated rotary knife of claim 1 wherein the cutting portion of each of the plurality of notches of the blade section of the rotary knife blade are arcuate.

3. The power operated rotary knife of claim 1 wherein the cutting portion of each of the plurality of notches of the blade section of the rotary knife blade define a trailing end of the notch with respect to the direction of rotation of the blade.

4. The power operated rotary knife of claim 1 wherein the lower end of the guide section of the trim guide extends radially inwardly of the lower end of the blade section of the rotary knife blade.

5. The power operated rotary knife of claim 1 wherein the lower end of the guide section of the trim guide extends axially below the lower end the blade section of the rotary knife blade.

6. The power operated rotary knife of claim 1 wherein the trim guide includes a circumferential rib that extends from the base of the trim guide, the circumferential rib extending axially above and radially outwardly of the blade section of the rotary knife blade.

7. The power operated rotary knife of claim 1 wherein the cutting portion of each of the plurality of notches of the blade section defining the cutting edge of the rotary knife blade is adjacent the lower end of the blade section.

8. The power operated rotary knife of claim 1 wherein the shearing portion of each of the plurality of notches of the guide section of the trim guide is adjacent the lower end of the guide section.

9. The power operated rotary knife of claim 1 further including a vacuum connector coupled to the blade housing, the vacuum connector releasably coupled to the trim guide and including an inner surface defining a funnel-shaped interior region, the vacuum connector including an upper cylindrical section, a tapered middle section and a lower mounting section, the lower mounting section including a trim guide interface portion including an arcuate rim portion and a latch extending from the arcuate rim portion, the trim guide further including a guard section extending axially upwardly from the base and having a radially inwardly extending lip, the latch of the trim guide interface portion of the vacuum connector releasably secured to the radially inwardly extending lip of the guard section of the trim guide to releasably couple the vacuum connector to the trim guide.

10. A combination of an annular rotary knife blade and a trim guide for a power operated rotary knife, the combination comprising:
the annular rotary knife blade supported for rotation about a central axis of rotation in a direction of rotation and rotating with respect to the trim guide, the knife blade including an annular body including an inner wall and an outer wall and an upper end and a lower end, the annular body of the rotary knife blade including a bearing surface for rotational support of the rotary knife blade and a driven gear for rotationally driving the rotary knife blade, the rotary knife blade further including a blade section extending from the lower end of the annular body, the blade section including a blade frustoconical wall extending between an upper end of the blade section and a lower end of the blade section, the lower end of the blade section spaced radially inwardly from and axially below the upper end, a plurality of circumferentially spaced apart notches extending from the lower end of the blade section into the blade frustoconical wall, each of the plurality of notches including a peripheral wall surrounding a central open portion, the peripheral wall including a cutting portion, the cutting portion of each of the plurality of circumferentially spaced apart notches defining a cutting edge of the rotary knife blade;
the trim guide including a base and a guide section extending radially inwardly and axially downwardly from the base, the guide section extending axially below and being adjacent to the blade section of the rotary knife blade and including a guide frustoconical wall extending between an upper end of the guide section and a lower end of the guide section, the lower end of the guide section spaced radially inwardly from the upper end of the guide section, a plurality of circumferentially spaced apart notches extending from the lower end of the guide section into the guide frustoconical wall, each of the plurality of notches including and a peripheral wall surrounding a central open portion, the peripheral wall including a shearing portion, the shearing portion in overlapping axial alignment with the cutting portions of the plurality of notches of the blade section of the rotary knife blade as the rotary blade rotates about the central axis of rotation in the direction of rotation.

11. The combination of claim 10 wherein the cutting portion of each of the plurality of notches of the blade section of the rotary knife blade are arcuate.

12. The combination of claim 10 wherein the arcuate portion of each of the plurality of notches of the blade section of defining the cutting edge of the blade rotary blade define a trailing end of the notch with respect to the direction of rotation of the blade.

13. The combination of claim 10 wherein the lower end of the guide section of the trim guide extends radially inwardly of the lower end of the blade section of the rotary knife blade.

14. The combination of claim 10 wherein the lower end of the guide section of the trim g

Assignees

• Bettcher Industries

Inventors

• Hall Joel L
• Pagano Terrence A
• Stump Kevin V

Classifications

• B26D7/1863

  by suction · CPC title

• B26B25/002 Primary

  Motor-driven knives with a rotating annular blade · CPC title

• B26B29/06

  Arrangements for guiding hand cutting tools (guiding equipment or arrangements for specific cutting tools, see the particular places, e.g. for hair trimming devices A45D24/36, for saw blades B27B11/02, B26B13/10) · CPC title