US 12,240,421 B1
Two speed trailer jack with friction clutch
Samuel R. Peacemaker, Gilbert, AZ (US); Benjamin Peacemaker, Chandler, AZ (US); Travis Ernest Yoch, Woodbury, MN (US); Preston Elijan Collins-Holt, Saint Paul, MN (US); and Casimir August Sienkiewicz, Minneapolis, MN (US)
Assigned to SOS Solutions, Inc., Tonasket, WA (US)
Filed by SOS Solutions, Inc., Tonasket, WA (US)
Filed on Oct. 2, 2024, as Appl. No. 18/905,066.
Int. Cl. B60S 9/08 (2006.01); B66F 3/10 (2006.01)
CPC B60S 9/08 (2013.01) [B66F 3/10 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A linear jack, comprising:
an outer tube defining a centerline axis;
a first rotating screw mounted to the outer tube and extending coaxially along the centerline axis;
a coarse nut threadedly coupled to the first rotating screw;
a first sleeve received at least partially into the outer tube, the first sleeve is configured to translate with respect to the outer tube between a first retracted position and a first extended position;
a second rotating screw in coaxial alignment with the first rotating screw, the second rotating screw is configured to rotate together with the first rotating screw; and
a second sleeve received at least partially into the first sleeve, the second sleeve is configured to translate with respect to the first sleeve between a second retracted position and a second extended position, and the second sleeve is threadedly coupled to the second rotating screw;
wherein:
in a first mode, the first rotating screw and the second rotating screw rotate relative to the coarse nut so as to cause the coarse nut and the second rotating screw to translate relative to the first rotating screw; and
in a second mode, a first friction force between a first contact surface of the coarse nut and a second contact surface of an end of the second rotating screw causes the coarse nut to rotate together with the second rotating screw and the first rotating screw.