Lancashire Dynamo & Motor Co., Ltd. - Assigned Patents

Manufacturers Index - Lancashire Dynamo & Motor Co., Ltd.

Lancashire Dynamo & Motor Co., Ltd.
Manchester, England, U.K.
Manufacturer Class: Steam and Gas Engines

Patents

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Patent Number	Date	Title	Name	City	Description
191,322,435	Oct. 05, 1914	Improvements in Band Brakes Particularly Applicable to Electrically Operated Band Brakes for Electric Cranes and the Like	Robert Stafford McLeod	, England	Abstract: In band brakes for electric cranes &c., of the kind in which the bands are connected to tightening-devices limited in their movement by stops so that the brake acts equally well for either direction of rotation ot the drum, the ends of the band are coupled to two bars connected to two cores of a solenoid, which, when energized, overcome the action of a spring or weight normally applying the brake. Fig. 2 shows a brake in which the ends a3, b3 of the bands are connected to bars a4, b4 attached to an applying- spring G4, and to two releasing solenoid cores h1, h2 which are drawn together when energized. Stops j1, j2 limit the movement, and the ends of the band are carried by links a5, b5. In modifications, the spring is replaced by a weighted lever fulcrumed on the bar a4 and connected to the bar b4, and the solenoid may, in such case, be arranged in connexion with the weight. In cases where multiphase alternating currents are used, a number of solenoids may be provided, being connected in the circuits of the several phases. Compensating for wear may be effected by forming the band in two parts, and connecting the parts by screw and nut c2, c3.
		Improvements in Band Brakes Particularly Applicable to Electrically Operated Band Brakes for Electric Cranes and the Like	Henry Bertram Whitmore	, England
191,501,774	Feb. 04, 1916	Improvements in Apparatus for Electrically Operating Planing Machines and the Like Reciprocating Tools	William Hargreaves	, England	Abstract: Systems for controlling reciprocating motion.- Planing - machines and like reciprocating tools are driven through a pair of co-axial shafts one of which may be the armature shaft of an electric motor or is driven from such shaft. The co-axial shafts are connected by epicyclic gearing so controlled by electro-magnetic clutches that, for drive in one direction, the planet pinion carrier is held stationary, while for reverse, the gearing rotates as a solid whole. A friction clutch on the reversing-shaft operates a throw-over switch f<4> putting resistance into one clutch circuit f<1> and cutting it out of the other g<1> to give light engagement during reversal and full grip for subsequent driving, thus avoiding shock. The tappet gear on the machine which controls the clutch switches S<1>, either directly or through other switches and solenoids, is arranged also to throw a pair of manually adjustable resistances Q, R alternately in and out of the shunt circuit of the motor thus providing for varying the speeds of the cut and reverse.
191,511,790	Aug. 10, 1916	Improvements in Short-Circuiting and Brush Lifting Gear for Alternating Current Motors	Henry Bertram Whitmore	, England	Abstract: Alternating - current induction machines; brush-holders; collecting-rings.- In slip - ring short - circuiting and brush-lifting gear for induction motors, each slip-ring P, Q, R is electrically connected to a pair of bars p p<1>, q q<1>, r r<1> which extend axially through the other two slip-rings but are insulated therefrom; each bar. may be made in two parts screwed into a slip-ring, as shown in connection with the bar q and slip-ring Q. The respective pairs of bars are connected together at one end by contact plates p<2>, q<2>, r<2>; at the other end, the three ends p<3>, q<3>, r' of the rotor windings are connected respectively to one bar of each pair. A rotating sleeve D carrying three tangentially-arranged shortcircuiting brushes E may be moved axially into contact with the plates p', q', r' to short-circuit the slip-rings, the edges of the plates being bevelled to allow the brushes to slide into position. The sleeve D is held in its end position by means of a spring- pressed ball d' engaging notches in the shaft. Axial movement is imparted to the sleeve by means of a crank-pin entering a groove therein and carried by a shaft f<1> fitted with a hand-wheel f<2>; the crank-pin is connected by a spring S to a projection s<1> on the casing tending to hold the crank in one or other of its extreme positions. Each slip-ring is fitted with a pair of brushes B carried from pins b<1> in brackets b<2>, and the extensions b<3> of the fingers b<4> overlap in elevation; the brackets b<2> are carried by, but insulated from, the brush-carrying bars b<5>, and the two brushes of each pair are connected together by a strip b<6> and are joined to a connecting-lug b<7>. The brushes are lifted off the slip-rings by the tall-pin h<5> carried by the lever H fulcrumed on the pivot h<2>; the lever H is fitted with an adjustable stop-pin h<3>, and a spring h<4> tends to keep the lever in position. The lever also carries a second tailpin h<1>, which extends underneath the extensions b<3> of the brush-fingers b<4>. In a modification, the contact plates p<2>, q<2>, r<2> are straight and are also tangentially arranged. The movement of the shaft f<1> may be effected automatically by means depending on the speed, voltage, current, or frequency.
191,514,026	Dec. 04, 1916	Improvements in Electro-Magnetically Operated Clutches, Particularly Applicable to Reversing Gear for Reciprocating Machines	William Hargreaves	, England	Abstract: Planing.-Reversing-gear, for reciprocating machines such as planing-machines, of the type described in Specification 1774/15, has the electro-magnetic clutches arranged to give a positive drive after slip has practically ceased. The friction surfaces D, E, Fig. 2, which are engaged alternately by those on the armature C, are carried by members slidable axially upon, but not rotatable relatively to, the members F, A<2>. Springs d<2>, e<2> maintain the parts in the position shown, as limited by screws d<3>. The magnets are not excited sufficiently to compress the springs until slip has practically ceased, clutch teeth c<1>, c<2> then affording a positive drive. In a modification, shorter additional springs J, Fig. 5, are provided, which give an increased resistance to overcome before engaging the clutch teeth. In a modification, the positive drive may be imparted by a pawl on one part and ratchet on the other, the pawl, normally held clear by a spring, being drawn into operative position by an increase in the magnetic flux. In a further modification, increase in the flux draws a block t<3>, Fig. 8, on to one of the parts, the resulting friction rendering a coil clutch T attached to the other part operative. The clutches may be controlled by a switch having an arm frictionally mounted on the shaft to be reversed and movable between stops. When reversal takes place, the switch arm moves over, cutting a resistance out of circuit with the driving-clutch and inserting resistance into circuit with the idle clutch ready for the next reversal. The frictional mounting of the arm may be controlled by an electromagnet in the main circuit so that, if the control switch is opened to stop the machine, the arm is returned by a centring-spring to a neutral position, thus preventing the machine from being restarted with the switch in such position as to cause engagement of the positive clutches before the parts have come to speed. The planer-table tappets may be arranged to throw over the reversing-switch in two stages, the first stage being arranged to supply current to the clutch magnet through a resistance, and the second stage cutting out the resistance. In further modifications, the resistance is controlled by a centrifugal governor or by the movement of the clutch armature itself. Electromagnetic clutches of the type described may be employed otherwise than in reversing-gearing. Fig. 15 is a diagram of connexions. The switch S operated by the tappets controls the clutch coils f<1>, g<1> and, at the same time, interchanges variable resistances n<3>, n<4> in series with the motor field winding. At the moment of reversal, the switch H moves to a central position, switching the resistance R into the clutch circuit. After reversal is effected, the switch moves over, cutting out the resistance. The main clutch switch Z is such that the circuit first closed always includes the resistance. R, later contact at z<2> serving to render the switch H operative. In a modification, a plain throw-over switch H is employed in connection with two resistances R.
2,234,585	Mar. 11, 1941	Filling Machine	Edward Percival Wilson	, England
2,627,838	Feb. 10, 1953	Apparatus for Impregnating Solid Bodies	Percy Huggins	, England	Application in Great Britain, 08 Jun., 1948.
2,813,392	Nov. 19, 1957	Machines for Wrapping Flexible Material on Cores	Edward Woosey	, England
2,959,721	Nov. 08, 1960	Multi-Phase Induction Motors	Henry Sterling	, England
		Multi-Phase Induction Motors	Thomas H. Barton	, England
		Multi-Phase Induction Motors	Oliver I. Butler	, England
3,032,668	May. 01, 1962	Control of Electric Machines	Kenneth Arthur Robinson	, England
		Control of Electric Machines	William Henry Woodward	, England
		Control of Electric Machines	Ronald John Frederick Howard	, England
3,046,468	Jul. 24, 1962	Control systems for Generators	Kenneth Arthur Robinson	, England
		Control systems for Generators	William Henry Woodward	, England
3,047,792	Jul. 31, 1962	Automatic Electric Current Regulators	Kenneth Arthur Robinson	, England
3,079,548	Feb. 26, 1963	Electromechanical Signalling Apparatus	Kenneth Arthur Robinson	, England
3,095,530	Jun. 25, 1963	Digital Control Apparatus for Ward-Leonard Electrical Machines	William Henry Woodward	, England
1,203,763	Sep. 03, 1970	Improvements in or Relating to Electric Rectifying Systems	Kenneth Arthur Robinson	, England	Thorn Automation, Ltd. was the successor to Lancashire Dynamo Electronic Products, Ltd. Abstract: In a rectifying system having output terminals connected to a capacitor C for smoothing the output, the capacitor C is allowed to charge via a diode D 1 whilst the rectified voltage is approaching its peak value and a gate Th 1 is so arranged and controlled as to connect the capacitor directly via the gate across the output terminals at a predetermined interval after the rectified voltage has passed its peak. With the thyristor Th 1 turned OFF capacitor C charges from period A (Fig. 3, not shown), when the rectified supply voltage equals the load voltage until the peak voltage is reached (at B). The capacitor is then prevented from discharging until the thyristor Th 1 is fired (at D) and continues to discharge until the thyristor is switched OFF (at C) when the voltage in the next half cycle reaches a value corresponding to that (at A) when the capacitor begins to charge. The thyristor may be arranged to fire whenever the voltage across the load reaches a preset value after its peak or it may be time controlled so as to fire in a predetermined phase relationship after the peak of the alternating current supply.