US 11,931,766 B2
Plural material dispensing system
Guang Chen, Suzhou (CN); and Qiang Xiao, Shanghai (CN)
Assigned to Graco Minnesota Inc., Minneapolis, MN (US)
Appl. No. 17/298,304
Filed by Graco Minnesota Inc., Minneapolis, MN (US)
PCT Filed Nov. 29, 2018, PCT No. PCT/CN2018/118162
§ 371(c)(1), (2) Date May 28, 2021,
PCT Pub. No. WO2020/107318, PCT Pub. Date Jun. 4, 2020.
Prior Publication US 2022/0048063 A1, Feb. 17, 2022
Int. Cl. B05C 11/10 (2006.01); G01F 11/02 (2006.01); G01F 15/00 (2006.01)
CPC B05C 11/1036 (2013.01) [G01F 11/029 (2013.01); G01F 15/005 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A plural material dispensing system comprising:
a motor;
a slide bracket connected to and configured to be driven by the motor;
a first cylinder;
a first pump rod mounted to the slide bracket and extending into the first cylinder,
the first pump rod comprising:
a first fluid inlet extending into the first pump rod;
a first fluid outlet extending through a first end of the first pump rod disposed within the first cylinder; and
a first flow path extending through the first pump rod between the first fluid inlet and the first fluid outlet;
a first piston mounted on the first end of the first pump rod;
a second cylinder;
a second pump rod mounted to the slide bracket and extending into the second cylinder, the second pump rod comprising:
a second fluid inlet extending into the second pump rod;
a second fluid outlet extending through a first end of the second pump rod disposed within the second cylinder; and
a second flow path extending through the second pump rod between the second fluid inlet and the second fluid outlet; and
a second piston mounted on the first end of the second pump rod;
wherein the slide bracket is configured to drive the first pump rod, first piston, second pump rod, and second piston in a first direction during a dispense stroke and a second direction during a refill stroke.