Screwdriver

Patent metadata

Field	Value
Publication number	US-10022846-B2
Application number	US-201314369821-A
Country	US
Kind code	B2
Filing date	May 27, 2013
Priority date	May 27, 2013
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The present invention provides a screwdriver which includes a shaft, a handle and a speed increasing mechanism, in which the speed increasing mechanism includes a central axle connected to the shaft and provided with a toothed part on its periphery, a first member is disposed in the interior of the handle, at least one gear is connected to the first member, and a geared sleeve is sheathed outside the gear, in which the inner side of the geared sleeve has teeth on corresponding positions, engaging with the gear which is disposed at a side part of the central axle and is engaged with the toothed part of the periphery of the central axle. The present invention also includes a locking mechanism addressing the problem of torque being not high.

First claim

The invention claimed is:

1. A screwdriver, comprising a shaft, a handle and a speed increasing mechanism, wherein the speed increasing mechanism comprises a central axle connected to the shaft and provided with toothed part on the periphery of the central axle; a first member is disposed in the interior of the handle, at least one gear is connected to the first member, and a geared sleeve is sheathed outside the at least one gear; wherein an inner side of the geared sleeve has teeth on corresponding positions, engaging with the at least one gear which is disposed at a side part of the central axle and is engaged with a toothed part of the periphery of the central axle;
further comprising a locking mechanism which comprises a second member rotatable along with the first member and a trigger switch connected to the second member, wherein an inner wall of a front portion of the second member, near the toothed part of the central axle, has teeth configured for engaging the toothed part of the periphery of the central axle; wherein when the trigger switch is pushed to a first position, the teeth on the inner wall of the front portion near the toothed part of the second member do not contact the toothed part of the periphery of the central axle; wherein when the trigger switch is pushed to a second position, the teeth on the inner wall of the second member are engaged with the toothed part of the periphery of the central axle;
wherein the second member is provided in the interior of the first member, being able to move forward and backward in relation to the first member, wherein the second member is a cylindrical inner sleeve, wherein an outside of the cylindrical inner sleeve includes a raised portion that is longitudinally arranged thereon, and wherein a hole is provided on a portion of the raised portion spaced longitudinally from the front portion having said teeth;
wherein there is an opening on a position corresponding to the trigger switch on the first member; the trigger switch has an extending portion passing through the handle and the opening of the first member and extending into the hole to fixedly connect to the second member; and the forward and backward movement of the second member is controlled by pushing the trigger switch forward and backward.

2. The screwdriver according to claim 1 , wherein the number of the at least one gear is three, and the three gears are identical, respectively provided with equal distance there between on the periphery of the central axle and engaged with the toothed part.

3. The screwdriver according to claim 1 , wherein a longitudinal width of the toothed part of the periphery of the central axle is greater than a longitudinal width of the at least one gear, and the central axle also has a portion other than the toothed part.

4. The screwdriver according to claim 1 , wherein each gear has an axle extending toward the handle connected to the first member, and a front portion of the first member near the shaft has a containing cavity for containing the axle of the at least one gear.

Assignees

• Hangzhou Great Star Tools Co Ltd
• Hangzhou Great Star Tools Co Ltd
• Hangzhou Great Star Ind Co Ltd

Inventors

• Wang Weiyi

Classifications

• B25B17/00 Primary

  Hand-driven gear-operated wrenches or screwdrivers (ratchet-operated B25B13/46 {B25B13/467}, B25B15/04; {for mounting or dismounting wheels B60B29/005}) · CPC title

• B25B15/02

  operated by rotating the handle · CPC title

• B25B15/04

  with ratchet action · CPC title

• B25B17/02

  providing for torque amplification · CPC title