| 主权项 |
1. A ratchet wrench comprising:
a handle 10 including a first and a second ends each respectively including a lowered face 11, 11′, an inclined through hole 12, 12′ having a threaded portion 13, 13′ for mounting a setscrew 14, 14′, and a cavity 15, 15′ communicated with the inclined through hole 12, 12′; a first and a second heads 16, 16′ extending from the first and the second ends of the handle 10, and each including a drive housing 17, 17′ defined therein and communicated with the cavity 15, 15′ respectively, the drive housings 17, 17′ each including a U-shaped section 18, 18′ in a top of the first and the second ends of the handle 10 and communicated with the cavity 15, 15′; and the first and the second heads 16, 16′ each further including a groove 19, 19′ in a top end thereof for mounting a ring element 20, 20′; a first and a second drive members 21, 21′ rotatably mounted in the drive housings 17, 17′, and each respectively including a plurality of gear teeth 22, 22′ in an outer periphery 23, 23′ thereof; the first drive member 21 further including a square inner periphery 35 that is adapted to receive a drive shaft 36 therein, and that includes a detent 37 and a notch 38 defined therein and spaced apart perpendicularly, and that also includes a square flange 39 including beveled faces 40, the first drive member 21 further including a through orifice 62 communicated with the notch 38 for insertion of a pin 63 for disassembling the drive shaft 36 from the first drive member 21; the second drive member 21′ further including a ¼″ drive hexagonal bit holder 53 in a top end thereof, including an annular groove 55 defined therein for partially receiving a double C retainer 56 therein for releasably holding a fastener-driving element, the second drive member 21′ further including a ¼″ drive fitting 54 on a bottom end thereof, including a bore 57 for retaining a spring 58 and a retention ball 59 for releasably engaging with a fastener-driving element; the drive shaft 36 including a oval hole 41 for receiving a oval pin 42 and a spring 44 that biases the oval pin 42 with an engagement end 43 for engaging with the notch 38 for slidably retaining the drive shaft 36 in the square inner periphery 35, the drive shaft 36 further including a ½″ drive fitting 45 and a ⅜″ drive fitting 46 each respectively including a bore 47, 50 for retaining a spring 48, 51 and a retention ball 49, 52, the spring 48 biasing the retention ball 49 to engage with the detent 37 to thereby recess the ½″ drive fitting 45 in the square inner periphery 35 and set the ⅜″ drive fitting 46 in position for releasably engaging with a fastener-driving element, the spring 51 biasing the retention ball 52 to press against one of the beveled faces 40 of the square flange 39 to thereby recess the ⅜″ drive fitting 46 in the square inner periphery 35 and set the ½″ drive fitting 45 in position for releasably engaging with a fastener-driving element; and a first and a second ratcheting mechanisms mounted in the first and the second ends of the handle 10, and each respectively including a pawl 24, 24′ that is rotatably mounted in the cavity 15, 15′ and includes two sets of lockup teeth 25, 25′ for selectively meshing with the gear teeth 22, 22′ of the first and the second drive members 21, 21′, two inclined faces 26, 26′, and two pressing faces 27, 27′ for selectively pressing against a wall of the cavity 15, 15′ when the first and the second drive members 21, 21′ being turned, and a spring 28, 28′ and a friction ball 29, 29′ both received in the inclined through hole 12, 12′, the spring 28, 28′ biasing the friction ball 29, 29′ to selectively butt against one of the two inclined faces 26, 26′ of the pawl 24, 24′; the pawls 24, 24′ each further including an axial cylinder 30, 30′ on a top end thereof, the axial cylinder 30, 30′ including a top end 65, 65′ located outside the top of the first and the second ends of the handle 10 and formed with an oblong portion 31, 31′ for fixedly mounting a switch lever 32, 32′ for turning the pawl 24, 24′ between tightening and loosening modes; and the ring elements 20, 20′ each respectively including a yoke 33, 33′ for restraining the axial cylinder 30, 30′ of the pawl 24, 24′ in the U-shaped section 18, 18′ of the drive housing 17, 17′ for stabilizing pivotal movement of the pawl 24, 24′ when the pawl 24, 24′ being turned. |
