# US 8,769,755 B2 · Side brush assembly mechanism > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,769,755 B2 - Document ID: US8769755B2 - Status: Granted - Kind: B2 - Application number: 12/942,683 - Filed: 2010-11-09 - Published: 2011-05-12 - Granted: 2014-07-08 - Earliest claimed: 2009-11-09 - Assignees: Tennant Company - Applicants: Matthew R. Hetler - Inventors: Matthew R. Hetler - Web page: https://patentgrep.com/patent/US8769755B2 ## CPC - E01H 1/053: {having vertical axes} - E01H: STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING {OR PREVENTING} FOG IN GENERAL {CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS}(cleaning in general B08B) ## Abstract A side brush assembly mechanism for a floor surface maintenance vehicle including a linkage assembly supporting a brush deck, a pivot assembly and a cable connected to the linkage assembly, and a cable tensioning device for retracting the cable. The cable tensioning device is capable of lifting and retracting the brush deck. The side brush assembly mechanism may include a biasing mechanism for lowering and extending the brush deck. ## Claims ### Claim 1 A side brush assembly mechanism for a floor surface maintenance machine comprising: a brush deck carrying a floor-engaging brush; a linkage assembly supporting the brush deck above the floor surface; a pivot assembly connected to a machine frame and adapted to rotate the brush deck and linkage assembly about a pivot pin, said pivot pin being generally vertical relative to the floor surface, with the pivot assembly adapted to swing the brush deck about the pivot pin either toward or away from a machine centerline; a cable connected at one end to the linkage assembly; a downforce spring connected at one end to a link of the linkage assembly, said downforce spring for biasing the brush deck downwardly toward the floor surface; and a selectively controlled cable tensioning device attached to a machine frame away from the linkage assembly and the pivot assembly, said cable tensioning device for retracting the cable during use of the machine to both raise and retract the brush deck, wherein upon activation by an operator the cable tensioning device provides a tension force on the cable tending to both lift the brush deck away from the floor surface and swing the brush deck about the pivot pin toward the machine centerline and extend the downforce spring, and when the tension force is decreased the brush deck swings about the pivot pin away from the machine centerline and lowers into contact with the floor surface and the downforce spring retracts causing the linkage assembly to pivot the brush deck toward the floor surface. ### Claim 2 (depends on 1) The side brush assembly mechanism of claim 1 wherein the linkage assembly includes a parallel arm lift linkage. ### Claim 3 (depends on 2) The side brush assembly mechanism of claim 2 wherein the parallel arm lift linkage maintains the brush deck generally parallel to a floor surface during machine operation. ### Claim 4 (depends on 1) The side brush assembly mechanism of claim 1 wherein the pivot assembly is outwardly biased by a biasing device. ### Claim 5 (depends on 4) The side brush assembly mechanism of claim 4 wherein the biasing device is a gas-charged spring. ### Claim 6 (depends on 1) The side brush assembly mechanism of claim 1 wherein the downforce spring is connected at one end to the pivot assembly and to a spring pin attached to the link of the linkage assembly at the other end. ### Claim 7 (depends on 1) The side brush assembly mechanism of claim 1 wherein the pivot assembly is limited to an outermost position by a restraining strap. ### Claim 8 (depends on 1) The side brush assembly mechanism of claim 1 wherein the pivot assembly is limited to an innermost position by an instop. ### Claim 9 (depends on 1) The side brush assembly mechanism of claim 1 wherein the cable tensioning device is a linear actuator. ### Claim 10 (depends on 9) The side brush assembly mechanism of claim 9 wherein the linear actuator provides a tension force on the cable tending to lift and retract the pivot assembly, linkage assembly and brush deck. ### Claim 11 (depends on 1) The side brush assembly mechanism of claim 1 wherein the cable is routed through a plurality of pulleys. ### Claim 12 (depends on 11) The side brush assembly mechanism of claim 11 wherein at least a pair of pulleys are mounted on the pivot assembly in generally horizontal orientation relative to the ground surface and one of the pulleys is mounted to the pivot assembly in a generally vertical orientation. ### Claim 13 A side brush assembly mechanism for a floor surface maintenance machine comprising: a pivot assembly adapted to pivot away from a machine centerline; a linkage assembly connected to the pivot assembly; a brush deck connected to the linkage assembly; a downforce spring connected to the linkage assembly, said downforce spring providing a downward bias force tending to move the brush deck toward contact with the floor surface; and a cable connected at one end to the linkage assembly and connected to a selectively controlled tensioning device at the other end, said tensioning device being connected to a machine frame away from the pivot assembly and linkage assembly, wherein application of a tension on the cable by the tensioning device causes the pivot assembly to retract toward the machine centerline about a generally vertical pivot pin and causes the linkage assembly to lift the brush deck away from a floor surface and causes the downforce spring to extend, and wherein upon a decrease in tension on the cable the pivot assembly pivots about the pivot pin away from the machine centerline and the downforce spring retracts and the linkage assembly lowers the brush deck into contact with the floor surface. ### Claim 14 (depends on 13) The side brush assembly mechanism of claim 13 wherein the pivot assembly rotates about a pivot pin attached to a frame of the machine. ### Claim 15 (depends on 13) The side brush assembly mechanism of claim 13 wherein the pivot assembly includes a parallel arm linkage adapted to maintain the brush deck in a generally horizontal manner as the brush deck adapts to floor surface contours. ### Claim 16 (depends on 15) The side brush assembly mechanism of claim 15 wherein the cable is routed through a plurality of pulleys. ### Claim 17 (depends on 13) The side brush assembly mechanism of claim 13 wherein the tensioning device is a linear actuator. ### Claim 18 (depends on 13) The side brush assembly mechanism of claim 13 further comprising: a plurality of biasing springs. ### Claim 19 (depends on 18) The side brush assembly mechanism of claim 18 wherein one of the biasing springs acts on the pivot assembly to provide an out force tending to pivot the pivot assembly outwardly away from the machine centerline. ### Claim 20 A side brush assembly mechanism for a floor surface maintenance machine comprising: a brush deck carrying a floor-engaging brush; a linkage assembly supporting the brush deck above the floor surface; a pivot assembly connected to a machine frame and adapted to rotate the brush deck and linkage assembly about a generally vertical pivot pin, with the pivot assembly adapted to swing the brush deck about the pivot pin either toward or away from a machine centerline; a cable and at least one pulley operatively connected to the linkage assembly and brush deck; a downforce spring connected to the linkage assembly and biasing the brush deck toward contact with the floor surface; and a cable tensioning device attached to a machine frame away from the linkage assembly and the pivot assembly, said cable tensioning device for retracting the cable during use of the machine to both raise and retract the brush deck, wherein upon activation by an operator the cable tensioning device provides a tension force on the cable tending to both lift the brush deck away from the floor surface and swing the brush deck about the pivot pin toward the machine centerline and extend the downforce spring, and when the tension force is decreased the brush deck swings about the pivot pin away from the machine centerline and the downforce spring retracts and lowers the brush into contact with the floor surface. ### Claim 21 (depends on 20) The side brush assembly mechanism of claim 20 wherein the pivot assembly includes a parallel arm linkage adapted to maintain the brush deck in a generally horizontal manner as the brush deck adapts to floor surface contours.