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US 7,818,886 B1Granted
Anti-pinch chainsaw bar assembly
OwnerMatthew Wade Grindstaff, Robert F. McDowellinventors
Life of this patent
Estimating the term…
Abstract
An anti-pinch chainsaw bar assembly for enabling the extraction of chainsaw bars when bound or pinched during cutting includes rolling bearing members integrated into outer surfaces of the bar. The bearings are arranged in groups of at least two bearings in rolling contact with one another. At least one bearing in each group extends outwardly from each outer surface of the bar. The assembly preferably also includes wedge structures mounted on the distal end of the bar for spreading out the sides of a cut.
Claims14
An anti-pinch chainsaw bar assembly, comprising:
- a) an elongate bar having a perimeter, opposed first and second outer surfaces, a mounting end and a distal end, at least a portion of said perimeter being adapted for guiding a saw chain around said bar, and
- b) a group of at least two roller bearings set into said bar wherein at least a first one of said roller bearings in said group presents a bearing surface outwardly past said first outer surface of said bar and at least a second one of said bearings in said group presents a bearing surface outwardly past said second outer surface of said bar, and wherein each of said bearings in said group is in rolling contact with at least one other bearing in said group.
An anti-pinch chainsaw bar assembly, comprising:
- a) an elongate bar comprising opposing outer plates and a slot formed around the periphery of said bar for receiving and guiding a saw chain;
- and
- b) a group of roller bearings including at least a first cylindrical roller bearing and a second cylindrical roller bearing mounted in said elongate bar, said first and second roller bearings in abutting rolling relationship with each other along respective peripheral surfaces thereof, a portion of each said first and second roller bearing extending outwardly from a respective outer surface of said opposing outer plates through openings formed therein such that rotation of said first cylindrical roller bearing facilitates rotation of said second cylindrical roller bearing.
Dependencies are inferred from the claim text.