Geometrical instruments – Scriber – Pantographic
Patent
1978-05-24
1979-09-11
Stearns, Richard R.
Geometrical instruments
Scriber
Pantographic
33174P, 125 11PH, B24B 5308, B24B 900, B23D 504
Patent
active
041670647
ABSTRACT:
A loading device is provided for a form follower which is primarily intended for use in following with a stylus a profile provided by a template and thus determining the movement of a tool. This arrangement is particularly suitable for the control of a tool for dressing a grinding wheel. The loading device includes an actuator resiliently loaded in a carrier which slides in a body and forms with that body two chambers for which the carrier constitutes a common piston, one of the chambers communicating with an inlet for connection with a source of hydraulic pressure to urge the carrier in a first direction, the other chamber having a port controlled by a valve movable with the actuator to couple the port alternatively to an outlet for connection with a reservoir of pressure or to the inlet in accordance with movement of the actuator in the first direction or in the opposite direction, respectively, relative to the carrier, the piston having differential surface areas exposed to the two chambers such that when the port is coupled to the inlet and the pressure is the same in the two chambers the carrier is urged in the opposite direction.
REFERENCES:
patent: 2602437 (1952-07-01), Tancred
patent: 2735420 (1956-02-01), Dall
patent: 2911182 (1959-11-01), Clarke et al.
patent: 3731563 (1973-05-01), Williams et al.
patent: 3815568 (1974-06-01), Gerner
Keighley Grinders (Machine Tools) Limited
Stearns Richard R.
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