# US 11,111,681 B2 · Power head for powered concrete roller screed > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,681 B2 - Document ID: US11111681B2 - Status: Granted - Kind: B2 - Application number: 16/577,468 - Filed: 2019-09-20 - Published: 2020-06-18 - Granted: 2021-09-07 - Earliest claimed: 2018-12-12 - Assignees: Marshalltown Company - Applicants: Marshalltown Company - Inventors: Charles H. Cowie; Michael Shane Grigg - Web page: https://patentgrep.com/patent/US11111681B2 ## CPC - E04G 21/10: Devices for levelling, e.g. templates or boards (smoothing tools E04F21/16, E04F21/24) - E01C 19/187: {solely for spreading-out or striking-off deposited mixtures, e.g. spread-out screws, strike-off boards} - E01C 19/24: hand propelled ({E01C19/235, } E01C19/27 - E01C19/29, {E01C19/41} take precedence) - E01C 19/262: {pedestrian-controlled, e.g. with safety arrangements for operator} - E01C 19/29: Rolling apparatus adapted to apply a rolling pressure less than its weight, e.g. roller finishers travelling on formrail {combined with spread-out, strike-off or smoothing means; Rolling elements with controlled penetration or a controlled path of movement in a vertical plane, e.g. controlled by the formrails, by guides ensuring a desired configuration of the rolled surface} - F16H 21/18: Crank gearings; Eccentric gearings - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS - E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H) - F16H: GEARING ## Abstract A power head for a powered concrete roller screed includes a handle and a driver housing at a distal end of the handle. A cordless, battery-operated driver is received in the driver housing. A head actuator includes a translatable link extending along the handle and an eccentric cam. The eccentric cam is operatively connected to the translatable link within the drive housing such that translation of the translation link imparts rotation of the eccentric cam about a rotational axis of the eccentric cam to an actuated position. The eccentric cam is adjacent a trigger of a cordless, battery-operated driver and is configured to depress the trigger when the eccentric cam is rotated about its rotational axis to the actuated position. ## Claims ### Claim 1 A power head for a powered concrete roller screed comprising: a handle; a driver housing at a distal end of the handle; a head actuator including a translatable link extending along the handle, and an eccentric cam operatively connected to the translatable link within the drive housing such that translation of the translation link imparts rotation of the eccentric cam about a rotational axis of the eccentric cam to an actuated position, wherein the eccentric cam is configured to depress a trigger of a driver received in the driver housing when the eccentric cam is rotated about its rotational axis to the actuated position, wherein the translatable link extends through the handle and into the driver housing to connect to the eccentric cam. ### Claim 2 (depends on 1) The power head of claim 1, wherein the eccentric cam is biased in an unactuated position, wherein in the unactuated position the eccentric cam is configured to not depress the trigger of the driver. ### Claim 3 (depends on 1) The power head of claim 1, wherein the translatable link is operatively connected to the eccentric cam at a position spaced apart from the rotational axis. ### Claim 4 (depends on 1) The power head of claim 1, wherein the eccentric cam rotates toward the handle when the eccentric cam is rotated about the rotational axis to the actuated position. ### Claim 5 (depends on 1) The power head of claim 1, wherein the eccentric cam is entirely disposed within the driver housing. ### Claim 6 A power head for a powered concrete roller screed comprising: a handle; a driver housing at a distal end of the handle; a cordless, battery-operated driver received in the driver housing, the cordless, battery-operated driver including a longitudinal axis, a trigger configured to be depressible in a direction generally transverse to the longitudinal axis, and an output shaft having a rotational axis extending generally perpendicular from the longitudinal axis; and a head actuator operatively connected to the handle and the driver, the head actuator including an eccentric cam disposed within the driver housing and configured to rotate about an axis of rotation to selectively depress the trigger of the cordless, battery-operated driver to operate the cordless, battery-operated driver wherein the cordless, battery-operated driver includes a handle opening having a closed perimeter, the trigger disposed in the handle opening, the eccentric cam configured to rotate within the handle opening to selectively depress the trigger of the cordless, battery-operated driver. ### Claim 7 (depends on 6) The power head of claim 6, wherein the handle includes an actuator trigger operatively connected eccentric cam such that movement of the actuator trigger rotates the eccentric cam about the axis of rotation. ### Claim 8 (depends on 6) The power head of claim 6, wherein the axis of rotation extends through the handle opening. ### Claim 9 (depends on 6) The power head of claim 6, wherein the head actuator includes a spindle attached to the driver housing and defining the rotational axis, the eccentric cam mounted on the spindle. ### Claim 10 (depends on 9) The power head of claim 9, wherein the eccentric cam includes a spindle bushing rotatably mounting the eccentric cam on the spindle. ### Claim 11 (depends on 10) The power head of claim 10, wherein the eccentric cam includes a link bushing configured to engage the trigger of the cordless, battery-operated driver to depress the trigger, the link bushing configured to rotate as the link bushing depresses the trigger. ### Claim 12 A power head for a powered concrete roller screed comprising: a handle; a driver housing at a distal end of the handle; a head actuator including a translatable link extending along the handle, and an eccentric cam operatively connected to the translatable link within the drive housing such that translation of the translation link imparts rotation of the eccentric cam about a rotational axis of the eccentric cam to an actuated position, wherein the eccentric cam is configured to depress a trigger of a driver received in the driver housing when the eccentric cam is rotated about its rotational axis to the actuated position, wherein the eccentric cam rotates toward the handle when the eccentric cam is rotated about the rotational axis to the actuated position. ### Claim 13 (depends on 12) The power head of claim 12, wherein the handle includes an actuator trigger operatively connected eccentric cam such that movement of the actuator trigger rotates the eccentric cam about the axis of rotation. ### Claim 14 (depends on 12) The power head of claim 12, wherein the head actuator includes a spindle attached to the driver housing and defining the rotational axis, the eccentric cam mounted on the spindle. ### Claim 15 (depends on 14) The power head of claim 14, wherein the eccentric cam includes a spindle bushing rotatably mounting the eccentric cam on the spindle. ### Claim 16 (depends on 15) The power head of claim 15, wherein the eccentric cam includes a link bushing configured to engage the trigger of the cordless, battery-operated driver to depress the trigger, the link bushing configured to rotate as the link bushing depresses the trigger.