Screwdriver with rotary cartridge including replaceable bits therein

• US 7,565,852 B2
• Filed: 01/22/2008
• Issued: 07/28/2009
• Est. Priority Date: 02/12/2007
• Status: Expired due to Fees

• Current Assignee: Hong-Chow Yu, Kae Mae Enterprise Co., Ltd.
• Original Assignee: Hong-Chow Yu, Kae Mae Enterprise Co., Ltd.
• Inventors: Yu, Hong-Chow
• Primary Examiner(s): Hail, III; Joseph J
• Assistant Examiner(s): MCDONALD, SHANTESE L
• Application Number:
  US12/009,726
• Publication Number:
  US 20080190249A1
• Time in Patent Office: 553 Days
• Field of Search: 811/771, 811/774, 814/39, 814/40, 814/90
• US Class Current: 81/177.4
• CPC Class Codes: B25B 15/02 operated by rotating the handle
• CPC Class Codes: B25G 1/085 for screwdrivers, wrenches or spanners

Abstract

A screwdriver with rotary cartridge including replaceable bits therein comprises a body including a cavity portion formed at one end thereof for receiving a rotary cartridge having grooves therein, the cavity portion including a mounting tube provided at front end thereof and communicating therewith, the grooves rotatably corresponding to the mounting tube, the cavity portion also including a slide seat secured at the rear end thereof and communicating therewith, the slide seat including a grip disposed thereon and having a push shank fixed at the front end thereof, wherein a slidable piece is attached in the cavity portion for being pushed by the push shank and includes a guide slot formed thereon, at one end of the rotary cartridge are extendedly defined with locking protrusions, on a rotating shaft of the rotary cartridge is pivotally secured an actuation member for rotatably retaining the corresponding locking protrusions, the actuation member includes a guiding tab disposed thereon for being fitted in the guide slot.

Claims

1. A screwdriver with rotary cartridge including replaceable bits therein comprising:

a body including a receiving portion, a front end of said body is provided with a mounting tube for communicating with the receiving portion, and a rear end of said body is provided with a slide seat for communicating with the receiving portion;

a rotary cartridge pivotally disposed in the receiving portion of the body and including at least one groove for receiving bits, and the at least one groove being rotatable to correspond to the mounting tube, and an end surface at one end of the rotary cartridge is provided with a plurality of locking protrusions;

a grip mounted on the rear end of the body, having a push shank at a front end of said grip, with the push shank being fitted in the slide seat, alignable with the at least one groove, and the mounting tube;

a slidable piece attached in the receiving portion and including a guide slot affixed thereon, at a rear end of the slidable piece is connected the grip, with the push shank actuating the slidable piece to slide;

an actuation member axially disposed on one end of a rotating shaft and including a guiding tab for being fitted in the guide slot of the slidable piece, with the slidable piece actuating the locking protrusions to rotate.

2. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 1, wherein the rotary cartridge includes a retaining slot mounted on the outer surface thereof, and the slidable piece includes a resilient piece fixed thereon, and the resilient piece includes a retaining boss in response to the retaining slot so as to bias against the rotary cartridge.

3. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 1, wherein said rotary cartridge is axially secured in a receiving member, and the receiving member is received in the receiving portion.

4. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 3, wherein a front end of said receiving member has a through opening corresponding to the mounting tube at the front end of the body, and a rear end of said receiving member has a through opening corresponding to the slide seat at the rear end of the body.

5. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 1, wherein between said push shank of the grip and said slide seat is formed a confining structure.

6. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 5, wherein said confining structure includes a recess defined at a front end of said push shank and having a stop plane formed at the front end thereof and a guide plane formed at the rear end thereof, on said slide seat is arranged a confining chamber in which a limiting member for being retained in the recess of said push shank is received.

7. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 6, wherein said limiting member includes a locking portion for resiliently locking with the recess and includes a hooking portion for hooking with the slidable piece so that as the push shank pushes the limiting member, the slidable piece is actuated to slide frontward and rearward.

8. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 1, wherein on the end surface of one end of the rotary cartridge are mounted a plurality of locking protrusions, each having an inclined plane formed thereon so as to lock with the actuation member.

9. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 1, wherein said mounting tube at the front end of the body includes a ratchet block fixed around the outer periphery thereof.

10. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 1, wherein said mounting tube of the body includes a polygon-bore segment arranged at the front end thereof, and a circular-bore segment formed at the rear end thereof and having a guiding device.

11. The screwdriver with rotary cartridge including replaceable bits therein as claimed in claim 10, wherein said guiding device at the rear end of the mounting tube includes a hole provided in said mounting tube and not passing through said circular-bore segment, said hole includes a ball mounted therein by an annular piece such that said ball resiliently extends into said circular-bore segment and corresponds to the flat position of said polygon-bore segment.