Screwdrivers for use with impact drivers

Abstract

The invention discloses a screw driving device used with an impact driver together. The screw driving device comprises a driving shaft, a hollow clutch sleeve, a depth control sleeve and a spring. The driving shaft is provided with a driving end and an inserting seat end provided with an annular wall; the annular wall is provided with a plurality of radial holes, clutch bearings are retained in the radial holes correspondingly, and the clutch bearings are cylinders with the head cutting conical ends; the hollow clutch sleeve is provided with a top end, a bottom end and a center channel; the top end of the center channel allows passing through of the driving end but does not allow passing through of the inserting seat end; an annular groove is formed in the position, at the bottom end of the center channel, of the hollow clutch sleeve; the annular groove is suitable for containing the corresponding clutch bearing when the driving shaft is located in the clutch position to enable the head cutting conical end of the clutch bearing to be separated from a screwdriver head to be kept in the corresponding radial hole; the depth control sleeve is located around the bottom end of the hollow clutch sleeve and provided with a bottom, and the bottom is provided with a first channel for allowing extending and passing through of the screwdriver head; and the spring is used for pushing the driving shaft to the driving position.

Description

technical field [0001] The invention relates to a screw driving device, in particular to a screw driving device used in an impact driver to control the depth of a screw being driven into a workpiece. Background technique [0002] Conventional arrangements for driving screws using power tools such as electric drills or impact drivers are well known in the art. For example, the "power transmission type screw screw in and out dual-purpose automatic stopper" disclosed in Taiwan No. 098218832 patent can work very well for electric drill drives that provide smooth and continuous driving force. However, due to the current use of longer and longer screws (screws) in the construction industry, electric drills are not efficient in driving these screws. Therefore, screw drives with impact drivers are used for driving long screws. The impact driver provides the oscillating torque needed to drive long screws, while the screwdriver controls the depth of screw penetration into the workpi...

AI Technical Summary

Problems solved by technology

[0003] However, the oscillating effect of the screwdriver with the impact driver can cause the round bearing of the screwdriver to break the shank edge of the bit it holds in the driven position

When this happens, the bearing can no longer grip the shank of the bit and cannot turn freely in the drive position

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