US 2734710 A
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Feb. 14, 1956 Y NOBLE 2,734,710 I SUPPORTING MECHANISMS Filed Aug. 21 1951 W MM By M
United States Patent SUPPORTING MECHANISMS John Maskill Noble, Dunstable, England, assignor to The English Electric Company Limited, London, England, a British company Application August 21, 1951, Serial No. 242,947
Claims priority, application Great Britain August 28, 1950 3 Claims. (Cl. 248276) This invention relates to a universal pivot support mechanism, i. e. a mechanism which supports a device and permits it to pivot independently about two mutually perpendicular axes. Such mechanisms find application in the support of various devices which need to be aimed, but the invention is particularly applicable to the support of a reflector for a radar aerial.
The universal pivot support mechanism according to the present invention comprises a bracket having two pivotal axes, one parallel to a perpendicular through the other, the device to be supported being mounted on the bracket pivotally about one of these axes, the bracket being mounted in a carriage pivotally about the other of these axes. Means are provided to control the orientation of the bracket relative to the carriage as the carriage moves relative to the base from which it is mounted.
The single figure of the accompanying drawing shows a diagrammatic plan view of a mechanism for supporting and turning a reflector dish for a radar aerial. This arrangement embodies the invention in preferred form.
The reflector dish is fixed to a base 11 which is pivotally mounted about axis 12 in a fork of a bracket 13.
Bracket 13 is mounted so as to pivot about the axis of pin 15, which is journalled in carriage 14. The axis 12 is parallel to the plane of the figure, and the axis of pin 15 is perpendicular to this plane. The pivoting of bracket 13 and the pivoting of base 11 about axis 12 therefore together provide, in effect, universal pivoting of reflector dish 10 relative to carriage 14.
Carriage 14 is supported from a base 16 by a pair of identical cranks 17, 18, having crank pins 19 and 20 in hearings in carriage 14 and having main bearings 21 and 22 in base 16. The spacing of bearings 21 and 22 is equal to that of crank pins 19 and 20 so that cranks 17 and 18 remain parallel when rotated. A coupling rod 23 pivotally connected to side arms 17a and 18a of cranks 17 and 18 assists in the maintenance of this parallelism of the cranks 17 and 18 when they are nearly in alignment.
A chain indicated by dotted line 24 is carried by sprockets of equal diameter mounted on crank pin 20 and pivot pin 15, secured respectively to crank 18 and bracket 13, and this chain thus maintains the axis 25 of bracket 13 parallel to cranks 17 and 18.
The distance between the axis of pivot pin 15 and the axis 12 is equal to the throw radius of each of the cranks 17 and 18, and the point of intersection of axes 25 and 12 therefore remains stationary relative to base 16 as the cranks are turned.
Patented Feb. 14, 1956 A motor indicated diagrammatically at 26, which may for example be a geared electric motor, is arranged to rotate crank 17 relatively to base 16. Similarly a motor indicated diagrammatically at 27, mounted upon the bracket 13, is arranged to rotate base 11 with reflector dish 10 about axis 12 relative to bracket 13. Flexible wiring (not shown) to feed the motor 27 may, of course, be carried along one of the cranks 17, 18, along the carriage 14, and along an arm of bracket 13.
It will be evident that the arrangement provides supporting means for reflector dish 10 which is capable of turning it to any attitude over a range extending about axis 12 in the plane of the figure and similarly about an axis perpendicular to the plane of the figure; and throughout these ranges the supporting mechanism does not obstruct the view of the reflector.
What I claim as my invention and desire to secure by Letter Patent is:
1. A universal pivot support mechanism comprising a bracket having two pivotal axes, one parallel to a perpendicular through the other, the device to be supported being mounted on the bracket pivotally about one of these axes and the bracket being mounted on a carriage pivotally about the other of these axes; the carriage being pivotally mounted on a crank and the crank being pivotally mounted on a base, both about pivotal axes parallel to the bracket-carriage pivotal axis; a pair of sprockets of equal diameter coupled by a chain, one on the bracketcarriage pivotal axis and secured to the bracket and the other on the carriage-crank pivotal axis and secured to the crank, so that the orientations of the bracket and of the crank relative to the carriage are always equal, and means to ensure that the carriage moves always parallel to a fixed axis in the base.
2. Mechanism according to claim 1 wherein the distance between the two pivotal axes of the bracket is equal to the throw radius of the crank.
3. A universal pivot support mechanism comprising a bracket having two pivotal axes, one parallel to a perpendicular through the other, the device to be supported being mounted on the bracket pivotally about one of these axes and the bracket being mounted on a carriage pivotally about the other of these axes; the carriage being pivotally mounted on a crank and the crank being pivotally mounted on a base, both about pivotal axes parallel to the bracket-carriage pivotal axis; a pair of sprockets coupled by a chain, one on the bracket-carriage pivotal axis and secured to the bracket and the other on the carriage-crank pivotal axis and secured to the crank.
References Cited in the file of this patent UNITED STATES PATENTS 1,255,185 Lehmkuhl Feb. 5, 1918 1,711,768 Bausch et a1. May 7, 1929 1,932,469 Leib et al Oct. 31, 1933 1,982,954 Grobe Dec. 4, 1934 2,391,795 Oliver Dec. 25, 1945 2,411,472 Slobod Nov. 19, 1946 FOREIGN PATENTS 629,364 Great Britain Sept. 19, 1949