Michael Dennis Harfst

6446534, Sep 10, 2002

Apr 28, 2000

09/561446

Michael D. Harfst - Milwaukie OR

Blount, Inc. - Montgomery AL

B27B 3314

83834, 83830

A cutter device has a cutter portion which is led by a depth gauge. The depth gauge is mounted on and extends upwardly from a substantially planar main body section. The depth gauge has a forward, or first section which extends upwardly from the main body, and when viewed from above is disposed at an angle relative to the central plane of the main body diverging therefrom on progressing rearwardly. The rear end of the first section is connected at a juncture section to a second section which progresses rearwardly and is disposed at an angle converging toward the central plane. The second section may extend across the plane of the body and diverge from the opposite side thereof on progressing rearwardly. The upper surface of the depth gauge presents a sweeping curve as viewed from the front of the cutter which is a multiple of the thickness of the body to which it is attached to provide effective cut control for the following cutter.

6748840, Jun 15, 2004

Aug 7, 2002

10/214986

Michael D. Harfst - Milwaukie OR

Blount, Inc. - Portland OR

B27B 3314

83830, 83834

A saw chain for a chain saw including alternating center and side link pairs with certain of said side links being cutting links and certain of said center links preceding said cutting links having guard portions to inhibit kick back. Said guard portions including a forward and rearward guard portion, the rearward guard portion in overlapping relation with a depth guide of the cutting link. A relief spacing between the guard portions facilitates chip carriage and the guard portions cooperatively form a ramp to guide wood being cut over and onto the depth gauge for controlling the depth of cut taken by the cutting link.

20080011144, Jan 17, 2008

Jul 11, 2007

11/776482

Michael D. Harfst - Milwaukie OR, US
Mark D. Lamey - Happy Valley OR, US
Mike Goettel - Canby OR, US
Lewis Scott - Lake Oswego OR, US
Kent Huntington - Molalla OR, US
Mike Patterson - Vancouver WA, US
Todd Gerlach - Tualatin OR, US

Blount, Inc., a limited liability company of Delaware - Milwaukie OR

B27B 33/14

83830, 29428, 83169

Embodiments of the disclosure provide a saw chain having cutter links having a cutting edge on a first end and an opposite second end adapted for riding on or along a rail of a guide bar. First drive links are coupled with the cutter links and are adapted to ride in a groove of a guide bar. The first drive links have a clean out tang sized and shaped to scoop debris from within the groove, and have two first drive link side surfaces on opposite sides thereof adapted to have at least occasional wearing contact with interior side walls of the groove. Second drive links are coupled with the first drive links and the cutter links, and are adapted to ride in the groove of the guide bar. Each second drive link has second drive link side surfaces adapted to have at least occasional wearing contact with the interior side walls of the groove. The second drive link side surfaces have a greater surface area than the first drive link side surfaces, and in some embodiments may be featured rudder links.

6058825, May 9, 2000

Mar 6, 1997

8/812742

Michael D. Harfst - Milwaukie OR

Blout, Inc. - Montgomery AL

B27B 3314
B27B 3302

83834

A cutter device has a cutter portion which is led by a depth gauge. The depth gauge is mounted on and extends upwardly from a substantially planar main body section. The depth gauge has a forward, or first section which extends upwardly from the main body, and when viewed from above is disposed at an angle relative to the central plane of the main body diverging therefrom on progressing rearwardly. The rear end of the first section is connected at a juncture section to a second section which progresses rearwardly and is disposed at an angle converging toward the central plane. The second section may extend across the plane of the body and diverge from the opposite side thereof on progressing rearwardly. The upper surface of the depth gauge presents a sweeping curve as viewed from the front of the cutter which is a multiple of the thickness of the body to which it is attached to provide effective cut control for the following cutter.

50503030, Sep 24, 1991

Dec 14, 1990

7/628421

James B. Sinclair - Waterloo, CA
Paul W. Pink - Kitchener, CA
Michael D. Harfst - Milwaukie OR
Robin A. Plumbley - Portland OR

Blount, Inc. - Montgomery AL

B23D 5904

301234

An improved saw bar and a chain sawing assembly includes a frame which houses a drive engine or motor and receives the saw bar, an endless cutting chain, and a sprocket mechanically coupling the drive engine to the cutting chain. The saw bar includes a bar member having a slot formed therein through at least a portion of the thickness of the bar member, with the slot extending from an attachment end to a nose end of the bar member. The saw bar also has a channel assembly, such as a tubular channel assembly, positioned in cooperation with the slot to deliver fluid from the attachment end to a channel outlet. In one embodiment, the saw bar has an idler sprocket pivotally mounted within a sprocket mounting slot formed at the bar member nose end. The channel outlet opens into the sprocket mounting slot to deliver lubrication fluid to the sprocket teeth. In an alternate embodiment, the channel outlet comprises a plurality of apertures along the length of an exposed wall of the channel member.

48739030, Oct 17, 1989

Jul 7, 1988

7/216191

Michael D. Harfst - Milwaukie OR

Blount, Inc. - Montgomery AL

B27B 3314

83830

Saw chain is assembled with wear links for improving the resistance of saw chain to abrasion from the saw bar. In one embodiment, the wear links are mounted one beside each steel side link in the chain and are constructed to ride along the outer surfaces of the pair of parallel rails upon which the side links also ride as the chain is driven around the bar. The wear links, however, are formed of a material that better resists abrasion than steel but consequently has less tensile strength. To assure that the tensile load on the chain is assumed by the steel side links while the chain is supported on the bar by the wear links, the wear links have oblong pin openings of the same height but of greater length than the circular openings of the side links. In a second embodiment, the wear links are mounted on both sides of each drive link rather than beside each side link.

48133230, Mar 21, 1989

Aug 18, 1987

7/086640

Michael D. Harfst - Milwaukie OR

Blount, Inc. - DE

B27B 3314

83830

A link for a chain has a first planar portion and a second portion integral with and disposed adjacent the first portion, the second portion being folded over to form a bight having a pair of parallel, laterally-spaced opposed walls defining a space therebetween and adapted to receive a first portion of an adjacent link.

20200180053, Jun 11, 2020

Feb 19, 2020

16/795144

- Portland OR, US
James Matthew Cunnington - Tualatin OR, US
Sam Hutsell - Portland OR, US
Michael D. Harfst - Milwaukie OR, US

B23D 57/02

A high efficiency saw chain for a saw including a cutting link and a drive link, the cutting link and a drive link selected to provide a high efficiency saw chain for a specified power range, based on ratios of components of the chain, such as the ratio of the height of the cutter to the pitch of the chain.