Measuring and testing – Fluid pressure gauge – With excess or maximum registering
Patent
1978-12-13
1980-01-22
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With excess or maximum registering
73729, 116266, 116DIG25, G01L 706
Patent
active
041843762
ABSTRACT:
A device (10) for metering discrete lengths of filament utilized in a flexible filament vegetation cutting device is disclosed. The line metering device (10) is preferably used in flexible filament lawn mowers. An electric motor (28) rotatively drives a drive shaft (32) about its axis. A driving mechanism, preferably a spool (36) is coupled to the drive shaft (32) for rotation therewith whenever the drive shaft (32) is rotated. A driven mechanism, preferably a guide drum (84), is selectively coupled for rotation to the driving mechanism (36). The spool (36) has the flexible filament (66) wound about it and is coupled to one of the driven and driving mechanisms (84, 32) for rotation therewith. The metering mechanism includes a device (172) for rapidly decelerating the rotating drive shaft (32) and driving mechanism (36), together with a device (54) for disengaging the guide drum mechanism (84) from the spool (36) during the rapid deceleration whereby the guide drum (84) is free to rotate a discrete amount relative to the spool (36). In this manner a length of filament (66) is metered from the spool (36).
REFERENCES:
patent: 3068831 (1962-12-01), Witchell
patent: 3258960 (1963-06-01), Baden et al.
patent: 3443365 (1966-04-01), Lee et al.
patent: 3916817 (1975-11-01), Kemp
patent: 3939457 (1976-02-01), Nelson
patent: 4020783 (1977-05-01), Anderson
patent: 4031847 (1977-06-01), Sullivan
patent: 4033733 (1977-07-01), Nelson
Manguson Harold A.
Thomas Timothy J.
Donaldson & Company, Inc.
Woodiel Donald O.
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