US 9,808,916 B2
Box end ratchet wrench with reduced ratcheting arc
Steven James Gapp, Dousman, WI (US); Clinton M. Johnson, Milwaukee, WI (US); and J. Reed Felton, Wauwatosa, WI (US)
Filed by Steven James Gapp, Dousman, WI (US); Clinton M. Johnson, Milwaukee, WI (US); and J. Reed Felton, Wauwatosa, WI (US)
Filed on Mar. 9, 2012, as Appl. No. 13/416,082.
Application 13/416,082 is a continuation in part of application No. 13/300,494, filed on Nov. 18, 2011, granted, now 8,567,287.
Application 13/300,494 is a continuation in part of application No. 12/419,791, filed on Apr. 7, 2009, abandoned.
Prior Publication US 2012/0167723 A1, Jul. 5, 2012
Int. Cl. B25B 13/08 (2006.01); B25B 13/48 (2006.01); B25B 13/46 (2006.01)
CPC B25B 13/08 (2013.01) [B25B 13/463 (2013.01); B25B 13/48 (2013.01); B25B 13/462 (2013.01); B25B 13/467 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A box end wrench comprising a wrench head and captured pawl assembly, the wrench head and captured pawl assembly comprising:
a wrench head body, the body comprising an insert cavity and a circular ratchet gear aperture;
a stationary body insert, the insert being received within the insert cavity of the body, the insert comprising at least two pawl-receiving apertures and a plurality of force component-receiving apertures, the pawl-receiving apertures being disposed immediately adjacent one another;
a ratchet gear wheel, the wheel having an outer perimeter and a plurality of gear teeth disposed about the full perimeter;
at least two pawls, each pawl comprising ratchet engaging teeth for engagement with the gear teeth disposed about the perimeter of the ratchet wheel gear, each of the at least two pawls being configured for retention within a pawl-receiving aperture of the stationary body insert;
a plurality of force components, the force components being configured to bias the plurality of pawls against the gear teeth disposed about the perimeter of the ratchet gear wheel;
wherein a reduced ratcheting arc is realized by placement of the pawls within the insert; and
wherein each pawl comprises a center axis and wherein a pawl swing arc and the reduced ratcheting arc are realized in accordance with the following formulas:

OG Complex Work Unit Drawing
wherein
θ: The pawl swing arc which is the angle subtended at the center axis of the gear wheel by the center axes of two adjacent pawls, measured in degrees;
α: The reduced ratcheting arc, also measured in degrees;
n: Any non-zero integer;
T: The number of teeth on the gear wheel; and
P: The number of pawls in the plurality of pawls.