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    • 2. 发明专利
    • Improvements in or relating to arrangements for producing variation or modulation ofthe natural frequency of a resonant circuit
    • GB655449A
    • 1951-07-18
    • GB3087248
    • 1948-11-29
    • KENNETH CHARLES JOHNSON
    • H03C3/14H03J7/04
    • 655,449. Frequency modulation; valve generating circuits. JOHNSON, K. C. Nov. 29, 1948, No. 30872. [Classes 40 (v) and 40 (vi)] Comprises means for varying or modulating the natural frequency of a resonant circuit, included for example in an amplifier or oscillator, for frequency modulation of a carrier or for other purposes. As shown in Fig. 1, the resonant circuit comprises a capacity branch C and an inductive branch including a coil L and a valve VI. A variable fraction r of the anode voltage is tapped off the potentiometer R and is applied through a condenser K1 to the grid. The natural frequency of the circuit C V1 L is 1/2##LCR/r, and is variable by shifting the tapping T. If the positions of L and C in the circuit are interchanged, the natural frequency is 1/2##LCr/R. A modified circuit, Fig. 2, employs a pentode valve V2 with a coil L in the anode lead, a condenser C connected between anode and cathode and a resistor R2 between cathode and H.T.-. The screen grid is connected directly to H.T.+, and modulating voltage M is applied to the suppressor grid to vary the current distribution between anode and screen grid. The impedance, as seen from the cathode, is a resistive minimum when f= 1/2##LCIS/IK, where IS is the screen current and IK the current through the condenser C. If the positions of C and L are interchanged, the friction IS/IK in the above expression is inverted. In a further modification (Fig. 3, not shown), the series circuit LC is connected between cathode and H.T.-, and the connection from the junction of L and C to the anode is replaced by an inductive coupling to the coil L, thus enabling the circuit to operate as an oscillation generator.
    • 3. 发明专利
    • Self-contained hydraulic means for driving gramophones
    • GB284029A
    • 1928-01-26
    • GB2681626
    • 1926-10-27
    • OSCAR CHARLES JOHNSON
    • G11B19/00
    • 284,029. Johnson, O. C. Oct. 27, 1926. Driving; starting and stopping; speed ,regulating.-A gramophone is driven by a motor comprising a compressible spring S acting on a piston E in a cylinder B containing oil or other fluid, the fluid being forced, as the spring expands, through ports H in a valve ring H fixed in a casing B above the cylinder, into oscillating members K, pivoted on the ring and having cylindrical arms in which piston rods T work; these arms carry sleeves N, which are connected to the pistons T and which are all coupled to a crank-pin 0 on an arm O fixed to a shaft O supporting the turntable O . Exhaust ports H , formed in the ring H beneath the members K, lead to the inside of the ring, while the inlet ports H all communicate with a circular groove H connected by a duct Z to the cylinder B. An orifice B connects tha interior of the ring to the portion of the cylinder B containing the spring. Thus as the sleeves N reciprocate, driving the turntable, the members K are oscillated, putting the inlet and discharge ports H , H alternately in communication with the cylindrical passages in which the rods T work. Power is stored in the spring S by mechanism which may be actuated by movement of the lid of the gramophone casing. The mechanism comprises bell-crank levers C C , which are both secured to a shaft C', free to turn in a bearing or collar C' slidably mounted on a rod C . The short arms of the bell-crank levers are connected, through links C, to the outer end of the piston-rod E . With the spring S unstressed, as shown, the collar C is engaged by a pivoted detent C , held in locking position by a spring S . To start the machine, the upper ends of the levers C are depressed, for example by closing the lid of the casing, (which may be connected to the levers for this purpose), and the piston E is thereby moved along the cylinder B, compressing the springs S, whilst oil flows past the piston-head. Then the detent C is moved so as to release the collar C , and the spring expands, driving the machine as previously described. The release movement of the detent C is effected by rotating a rod G by means of a handle G , the rod carrying a pin G which depresses the outer end of the detent. At the same time, a friction pad G is moved away from the turntable. The speed of the machine is governed by providing on the turntable spindle O radial extensions of the arm O , the ends of which have attached thereto, by means of leaf springs, weights P' carrying friction pads. The pads bear against a coned surface P on the inside of the casing, and the vertical position of the friction pads relatively to the surface P is varied as desired, to control the speed, by raising or lowering within the casing a bush O , together with the spindle O passing through it, and all the parts carried by the spindle. This vertical adjustment is effected by means of a rod M passing through an oblique slot in the casing.
    • 7. 发明专利
    • Improvements in Furnace Grates.
    • GB190700127A
    • 1907-06-06
    • GB190700127D
    • 1907-01-02
    • DORRANCE CHARLES JOHNSON
    • DORRANCE CHARLES JOHNSON
    • 127. Dorrance, C. J. Jan. 2. Fire-bars and grates.-In a furnace grate of the kind in which grate bars journaled in bearing-bars are rocked by link-and-lever mechanism, the firebars B, Figs. 2 and 4, are prevented from being lifted from their bearings during the rocking operations by arranging the journals b eccentrically, and by forming upon the side plate b of the journal a projecting lip b which fits closely beneath the boss a upon the side frame A, Figs. 2 and 12. The fuel surface is formed by a number of removable members F, Fig. 7, with convex upper surfaces and forked lower ends to engage with the fire-bar B, which is of rectangular section. The ends of the fire-bars are provided with fuel-supporting members E, E of the forms shown in Figs. 6 and 11. These members embrace the bar at the journals band engage with grooves within ribs b , b . The member shown in Fig. 11 has an overhanging lip e , which serves to remove cinder or clinker from the side walls during the rocking operation. Alternate grate bars are connected so as to form two sets, which are rocked simultaneously by a lever d connected by the bar D to the arm b on the fire-bar B. The alternate sets of fire-bars are made to rock in opposite directions by connecting one of them to the upper, and the other to the lower end of the lever C.