Patent ID: 6966241

Claim:
A selective one-way wrench including: a head defining a circular space with a reduced open end, a crescent space communicated with the circular space and a hole communicated with the crescent space; a transmission element including a protrusion formed on a lower face thereof adjacent and facing said crescent space and a cutout defined therein, wherein the transmission element is put in the circular space while the cutout is exposed to the exterior through the reduced open end of the circular space; a spring-biased detent put in the hole; a pawl including a plurality of teeth formed on a first side thereof, a groove defined in an opposite second side thereof and a recess defined in an upper face thereof near the first side thereof, wherein the pawl is put in the crescent space so that the spring-biased detent is trapped in selective one of two ends of the groove and that the protrusion is put in the recess; a gear including a plurality of teeth formed on a periphery thereof, wherein the gear is put in the circular space so that the teeth thereof are engaged with the teeth of the pawl; and a switch including two rods extending from a lower face thereof, wherein the switch is put in the reduced open end of the circular space so that the rods enter the cutout.