Electricity: circuit makers and breakers – Special application – Control by direction of rotation of shaft or spindle
Patent
1990-05-01
1991-08-13
Tolin, Gerald P.
Electricity: circuit makers and breakers
Special application
Control by direction of rotation of shaft or spindle
200336, 200291, 74553, H01H 1960
Patent
active
050398300
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for manual control by driving a rotating button.
Certain items of equipment, in particular in the military and avionics fields, have to be highly compact and of low weight and the design which results from this is such that the incorporation of a rotary control button, generally on a front face, presents difficulties, if not being impossible.
In fact, a manual control button generally comprises a mechanical axle which is at one end driven by the rotation of the button and whose other end drives a part in such a way as to produce the desired control. In this common type of implementation the control button is next to the panel on which it is mounted, the mechanical axle passing through the panel, the part driven by the axle lying on the other side of the panel relative to the button.
In the well-known case of a potentiometer for example, the driven part is the potentiometer slider and the rotation of the button is conveyed via an extracted variable-level electrical signal between the slider and one end, itself connected to a reference potential.
The invention is intended for such cases and an example of a corresponding application is described below which relates to, more particularly, an apparatus for visualization on a flat screen, this apparatus possibly constituting an item of hardware on board an aircraft. The use, for such an apparatus, of a box which tightly follows the shape of the screen does not allow much room for a classical control body with mechanical axle to pass, whence the need for another solution.
The aim of the invention is to resolve such problems by reducing the volume of the control device to essentially that taken up simply by the control button in front of the panel.
The invention proposes a device for manual control by driving a rotating button, mounted on a support and comprising the button, an axle integral with the button and controlled in rotation by the button, a given assembly, formed by a fixed ratchet wheel, coaxial with the axle, with internal toothing, an electrical contact mounted on the axle and provided with at least one conducting strip forming a ratchet for the ratchet wheel and being locked by the toothing of the ratchet wheel for a given direction of rotation of the axle and slipping on the toothing for the direction of rotation of the axle opposite to the given direction, and electrical access connected respectively to the axle and to the wheel, and in which the mechanical connection which passes from the wheel to the axle via the support, is electrically insulating, characterized in that the contact is mounted in such a way as to slip on the axle when it is locked by the ratchet wheel and in that the device comprises an inverse assembly formed from a ratchet wheel and a contact, mounted on the axle, next to the given assembly, in inverse fashion relative to the given assembly, that is to say in a fashion such that the strip forming the ratchet of this inverse assembly is locked for the direction of rotation of the axle inverse to the given direction and slips on the toothing for the given direction of rotation.
The particular features and advantages of the invention will emerge in the description which follows given by way of example with reference to the attached figures which represent:
FIG. 1, in median section through the axis of rotation, an example of an embodiment according to the invention of a device for manual control by driving a rotating button;
FIGS. 2 and 3, detail diagrams relating to the switch system constituted by the two strips and the associated toothings;
FIG. 4, a diagram of the circuits for exploiting the signals produced by the rotation of the button, in order to produce a corresponding variation signal;
FIGS. 5 and 6, diagrams relating to an example of the use of the invention on an apparatus for visualization using a liquid crystal screen.
FIG. 1 shows a button, 1, which is controlled in manual rotation, by the operator, about the axis of rotation Z..The button 1 has the form of a cylindrical tub
REFERENCES:
patent: 1664624 (1928-04-01), Heichen
patent: 2993972 (1961-07-01), Stewart
patent: 3975601 (1976-08-01), Whelan
patent: 4594483 (1986-06-01), Rosl
patent: 4955253 (1990-09-01), Sakai
Thomson - CSF
Tolin Gerald P.
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