Actuating device for use in powered screwdriver

• US 5,557,990 A
• Filed: 07/27/1995
• Issued: 09/24/1996
• Est. Priority Date: 07/27/1995
• Status: Expired due to Fees

• Current Assignee: Aeromax-Tool Specialties Limited
• Original Assignee: Aeromax-Tool Specialties Limited
• Inventors: Shin, Fu-zong
• Primary Examiner(s): Meislin, D. S.
• Assistant Examiner(s): DANGANAN, JONI BALDOS
• Application Number:
  US08/507,823
• Time in Patent Office: 425 Days
• Field of Search: 81/54, 81/57, 81/57.11, 81/429, 81/52, 81/57.31, 81/436
• US Class Current: 81/54
• CPC Class Codes: B25B 21/00 Portable power-driven screw or nut setting or loosening tools; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; for mounting or dismounting wheels B60B29/006; Attachments for drilling apparatus serving the same purpose machines B23P19/06

Abstract

A powered screwdriver includes a tool head, a lower cylinder, a hollow shaft insertable through the lower cylinder, an upper cylinder engageable with the lower cylinder, a passage defined in the upper cylinder, a motor-driven axle insertable through the passage and engageable with the hollow shaft so that the hollow shaft and the motor-driven axle are slidable but not rotatable with respect to each other and an actuating device including a lower ring securely received in the passage, an actuator with a collar slidably mounted on the motor-driven axle and a tab radially extending from the collar and projecting through a slot defined in the upper cylinder, a spring mounted on the motor-driven axle, an upper ring securely received in the passage and a push-button switch mounted on the upper cylinder. When the powered screwdriver is pushed against a screw, the motor-driven axle is further inserted into the hollow shaft. The collar of the actuator is pushed by means of the hollow shaft. The push-button switch is pressed by means of the tab of the actuator.

Claims

1. A powered screwdriver comprising a tool head (10), a lower cylinder (20), a hollow shaft (21) insertable through the lower cylinder (20), an upper cylinder (30) engageable with the lower cylinder (20), a passage (32) defined in the upper cylinder (30), a motor-driven axle (40) insertable through the passage (32) and engageable with the hollow shaft (21) so that the motor-driver axle and the hollow shaft are slidable but not rotatable with respect to each other and an actuating device including a lower ring (34) securely received in the passage (32), an actuator (42) with a collar slidably mounted on the motor-driven axle (40) and a tab radially extending from the collar and projecting through a slot (35) defined in the upper cylinder (30), a spring (43) mounted on the motor-driven axle (40), an upper ring (44) securely received in the passage (32) and-a push-button switch (50) mounted on the upper cylinder (30), wherein as the powered screwdriver is pushed against a screw, the motor-driven axle (40) is further inserted into the hollow shaft (21) so that the collar of the actuator (42) is pushed by means of the hollow shaft (21) so that the push-button switch (50) is pressed by means of the tab of the actuator (42).

2. A powered screwdriver according to claim 1 wherein the hollow shaft (21) includes an internal surface with a non-circular portion (24) and the motor-driven axle (40) includes a non-circular portion (41) in engagement with the non-circular portion (24).