Brushing – scrubbing – and general cleaning – Machines – Brushing
Patent
1986-03-14
1987-07-14
Roberts, Edward L.
Brushing, scrubbing, and general cleaning
Machines
Brushing
15 50C, 15320, 15384, 15389, 51176, A47L 1118, A47L 1120
Patent
active
046792716
ABSTRACT:
There is disclosed an improvement in a surface maintenance machine whereby means are provided for automatically maintaining a desired normal force by a maintenance tool against a surface being maintained, although there may be undulations in the surface, variations in the condition of the surface and changes in the tool caused by wear. Normal force is applied to the tool by gravity and an actuator, both acting through a load cell which senses their algebraic sum, compares this with a preset desired force and operates the actuator as needed to maintain the force at or near the pre-set level. Further, the load on the motor or motors driving the tool is sensed and compared against high and low reference points. If drive motor load is outside of the reference limits a signal is provided which causes a decrease or increase in the normal force to maintain the motor load within limits.
REFERENCES:
patent: 3531078 (1982-09-01), Sternberg
patent: 3531249 (1985-06-01), Sternberg
patent: 3702488 (1972-11-01), Kasper
patent: 4218798 (1980-08-01), Block
Field Bruce F.
Kasper Joseph G.
Roberts Edward L.
Tennant Company
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