US 12,240,139 B2
Chain saw lubrication pump and control systems and methods
Andrew Burden, Newnan, GA (US); Miles Hsu, Marietta, GA (US); Isabel Novak, Fairview, NC (US); Bahiru Woldemariam, Snellville, GA (US); and Daniel Yameen, Quincy, MA (US)
Assigned to TECHTRONIC CORDLESS GP, Anderson, SC (US)
Filed by TECHTRONIC CORDLESS GP, Anderson, SC (US)
Filed on Dec. 8, 2021, as Appl. No. 17/545,897.
Prior Publication US 2023/0173708 A1, Jun. 8, 2023
Int. Cl. B27B 17/12 (2006.01); B27B 17/02 (2006.01); F16N 7/38 (2006.01)
CPC B27B 17/12 (2013.01) [B27B 17/02 (2013.01); F16N 7/38 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A chainsaw comprising:
a housing;
a guide bar extending from the housing;
a chain dispose around the guide bar and driven by a prime mover;
a user input controlling movement of the chain about the guide bar; and
a lubrication system that provides lubricant to the chain, the lubrication system comprising:
a reservoir housing the lubricant;
a fluid conduit extending between the reservoir and a location adjacent to the chain;
a pump configured to move lubricant from the reservoir to the location adjacent to the chain; and
a valve disposed along the fluid conduit, the valve having a lubricant inlet that receives lubricant from the reservoir, an air inlet, and an outlet that provides lubricant to the location adjacent to the chain,
wherein the valve is movable between an open position whereby lubricant passes from the lubricant inlet to the outlet and a closed position whereby the outlet is in fluid communication with the air inlet, and wherein the valve moves between the open and closed positions in response to the user input.