Screwdriver with revolving cylinder containing replaceable screwdriver tips

• US 7,028,593 B1
• Filed: 07/06/2005
• Issued: 04/18/2006
• Est. Priority Date: 07/06/2005
• Status: Expired due to Fees

• Current Assignee: Hong-Chow Yu, Kae Mae Enterprise Co., Ltd.
• Original Assignee: A. A. G. Industrial Co., Ltd., Hong-Chow Yu
• Inventors: Lin, Shu-Sui, Yu, Hong-Chow
• Primary Examiner(s): ACKUN, JACOB K
• Application Number:
  US11/160,727
• Time in Patent Office: 286 Days
• Field of Search: 814/38, 814/39, 814/37, 814/36, 811/774, 814/90
• US Class Current: 81/439
• CPC Class Codes: B25B 15/02 operated by rotating the handle
• CPC Class Codes: B25G 1/085 for screwdrivers, wrenches or spanners

Abstract

Provided is a screwdriver comprising a pivotal removable revolving cylinder containing screwdriver tips a pivot bucket with the revolving cylinder disposed therein, and a flexible limiting member fastened at either cut on the shank of a handle for fastening the handle in its operation or storage position. In a revolving cylinder replacement operation pull the handle rearward to disengage the shank with the revolving cylinder, pull the pivot bucket upward by pivoting until it is disposed externally of a slot in a body, remove a pivot pin for replacing the revolving cylinder, mount the revolving cylinder in the pivot bucket, and pivot the pivot bucket downward to dispose in the slot again.

Claims

1. A screwdriver comprising:

a revolving cylinder having a plurality of lengthwise screwdriver tip receiving holes equally spaced around its central bore, and a plurality of parallel, lengthwise troughs formed on its surface;

a body including a forward ratchet wheel, a sleeve projected from the ratchet wheel, a rear slot in communication with the sleeve, a projection disposed at one side of the slot, a pivot bucket disposed in the slot and hingedly connected to the projection, the pivot bucket including a removable pivot pin pivotably disposed across one end thereof, the central bore of the revolving cylinder, and the other end thereof, and two openings at both ends, a detent disposed between the pivot bucket and the revolving cylinder and including a resilient member having a plurality of protrusions on its surface, the protrusions being adapted to fit in the troughs, a rear tube in communication with the slot, a slit disposed on the tube, and a flexible limiting member inserted into the slit, the limiting member including a central aperture; and

a handle including a forward shank inserted into the tube, a magnet formed on a front end of the shank, and a limiting mechanism disposed on the shank and including an annular forward first cut and an annular rear second cut wherein in a ready to use position the shank is adapted to pass through one opening and the receiving hole to push a screwdriver tip engaged the magnet out of the receiving hole and the other opening to dispose at a front end of the sleeve, and the second cut is anchored in the aperture, wherein;

in a screwdriver tip change operation in the ready to use position, pull the handle rearward until the screwdriver tip is retracted into the receiving hole, the shank disengages the revolving cylinder, and the first cut is anchored in the aperture, turn the revolving cylinder about the pivot pin engage the protrusions with the aligned troughs with the screwdriver tip to be selected aligned with the openings, and push the shank to move the screwdriver tip out of the revolving cylinder and the other opening to dispose at the front end of the sleeve in the ready to use position again;

in a screwdriver tip replacement operation in the ready to use position, pull the handle rearward to disengage the shank with the revolving cylinder, pull the pivot bucket upward to cause the pivot bucket to pivot about the projection until the openings are disposed externally of the slot, turn the revolving cylinder for aligning the screwdriver tip to be replaced with the openings, pull the screwdriver tip out of the other opening for removal, insert another screwdriver tip into the receiving hole through the other opening, and pivot the pivot bucket downward to dispose in the slot again; and

in a revolving cylinder replacement operation pull the handle rearward to disengage the shank with the revolving cylinder, pull the pivot bucket upward by pivoting until it is disposed externally of the slot, remove the pivot pin for replacing the revolving cylinder, mount the revolving cylinder in the pivot bucket, and pivot the pivot bucket downward to dispose in the slot again.