Forest mattock with braked rotation system

Earth working – With drive means for tool or cleaner – Intermittent drive for tool

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Details

172 72, 172125, A01B 3908

Patent

active

046167153

ABSTRACT:
A rotation control system for the mattock (2) of a tuft-building forest mattock, whereby rotation of the mattock is adapted to be braked or stopped stepwise in a manner that each pick (3) in turn works a whole in the first stage, in the second stage the pick (3) of the mattock removes surface deposit from between the obtained hole and a tuft to be built, and in the third stage, as mattock (2) is allowed to rotate freely, pick (3) leaves the loosened earth behind as a tuft. In order to make the sticking angle and depth dictated by the start moment of braking stages readily adjustable according to various qualities of soil, at a certain angle of rotation of the mattock a first impulse sensor actuates a first delay timer (6), adapted after a settable delay time to turn on a brake (11) for setting out the first stage of the mattock (2). As a certain angle of rotation of the mattock, a second impulse sensor (5) actuates a second delay timer (7), adapted after a certain delay time to turn on said brake (11) for setting out the second stage of the mattock (2). The duration of the first and second stage, i.e. the braking effect stopping the rotation of the mattock (2), is adapted to be controlled each by its own timer (8 and 9) whose setting time is adjustable.

REFERENCES:
patent: 388428 (1888-08-01), McCormick
patent: 1800634 (1931-04-01), Isenberg
patent: 2221550 (1940-11-01), Lindgren
patent: 2337620 (1943-12-01), Peacock

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