One World Technologies, Inc.

Ryobi Motor Products Corp.

Ryobi North America, Inc.

James E Thurler

John E Nemazi

Ralph E Smith

Devin L Moore

William E Kaiser

Michael E Sheriff

Siu Sum Yue

Philip J Snoke

A hammer drill has a motor which drives an axially displaceable intermediate gear mounted in an intermediate gear arrangement. An impact mechanism is formed by including interacting impact cams between either the intermediate gear and the housing, or the motor armature shaft and the housing to generate a reciprocating motion on an output spindle or shaft. A spindle locking mechanism is included which causes an intermediate gear to be disengageable with respect to the output shaft, while still permitting the impact mechanism to be engaged. Such an arrangement allows the hammer drill to operate in a hammer-only or chipping mode.

Spindle lock and chipping mechanism for hammer drill

Laser arbor

A drill assembly including a drill and depth stop assembly is disclosed. The drill includes a housing, an electric motor and a chuck operatively driven by the electric motor about a drill axis. The depth stop assembly includes a depth stop rod, a mounting block, a fastener and a rotatable handle. The mounting block has a mounting surface adapted to cooperate with the housing, a first aperture spaced from the mounting surface for supporting the depth stop rod generally parallel to the drill axis, and a second aperture extending about a fastener axis generally normal the mounting surface. The fastener extends through the mounting block second aperture about the fastener axis and has two ends respectively cooperative with the housing and the handle to releasably entrap the mounting block therebetween to enable a user to adjustably position the depth stop rod relative to the housing. Preferably the fastener threadedly attaches to a threaded aperture in the drill housing. Ideally, the mounting block includes first and second mounting block halves which releasably clamp about the depth stop rod.

Depth stop assembly for a portable electric drill

A hammer drill has a motor disposed in a housing, and the motor has a rotatable armature shaft. A pinion at an end of the armature shaft drives an axially displaceable intermediate gear mounted on an intermediate shaft. An intermediate pinion is mounted for rotation with the intermediate gear and drives an output gear fixed about the midsection of an axially displaceable output shaft. The intermediate gear has input and output faces. The input face is associated with a first cam mechanism for generating reciprocating motion. The output face is engageable with an impact face of the output gear to transmit axial displacement therebetween. A second cam mechanism is affixed to the housing and axially spaced from the first cam mechanism. The first and second cam mechanisms are engageable by sufficiently axially displacing the output shaft so that the output gear impact face abuts the intermediate gear output face axially displacing the intermediate gear so that the first and second cam mechanisms abut each other. The first and second cam mechanisms are configured with respect to each other to generate reciprocating motion and cause the intermediate gear to reciprocate axially as the first cam mechanism rotates relative to the second cam mechanism while the first and second cam mechanisms are engaged. The output face of the intermediate gear transmits the reciprocating motion to the output gear impact face to axially reciprocate the output shaft as it rotates.

Impact mechanism for a hammer drill

An adjusting mechanism for a hammer drill that will switch the drill from conventional drill only mode to a hammer drill mode by rotating an adjusting rod. The generally cylindrical adjusting rod includes an impact cam and an adjacent and smaller drill cam. One of the two cams will be in a position adjacent a thrust ball, which is on the back of the spindle. When the drill cam is rotated into position to contact the thrust ball, a clutch face on an output gear will be held in spaced relation to a clutch face on an impact bushing with a resulting drill only rotational motion of the spindle; when the impact cam is rotated into position adjacent the thrust ball, the two clutch faces will come into engagement with one another and create a hammer drill motion of the spindle.

Drill adjustment mechanism for a hammer drill

Right angle sander/grinder

Growing community of inventors

Pickens, SC, United States of America

James E Thurler