Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
267 words
A switching control circuit for electrical devices, comprising: (a) a pair of input terminals which, in use of said circuit, are connected to a source of power for electrical devices whose switching on and off is to be effected; (b) a control resistor; (c) a first pair of output terminals, one terminal of which is connected by way of said control resistor to one of said input terminals, the other output terminal being connected to the other input terminal, said output terminals to be connected in power supplying relation to a first electrical device having an on/off power switch; (d) a second pair of output terminals; (e) energizable means responsive to energization thereof for connecting said second pair of output terminals across said pair of input terminals; and (f) sensing and delay means including a high gain amplifier having an input connected across said control resistor for producing a voltage output in response to current caused to flow through said control resistor when the first electrical device is connected to said first pair of output terminals and its said on/off power switch is initially turned on, said sensing and delay means further including circuitry coupled to said high gain amplifier and responsive to said voltage output thereof for energizing said energizable means after a predetermined time delay elapses from the time that said high gain amplifier voltage output reaches a given threshold value, whereby power from said power source will then be supplied via said energizable means to said second pair of output terminals and to any second electrical device whose power input terminals are connected thereto.
Claim 2
Dependent Claim
267 words
A switching control circuit for electrical devices, comprising: (a) a pair of input terminals which, in use of said circuit, are connected to a source of power for electrical devices whose switching on and off is to be effected; (b) a control resistor; (c) a first pair of output terminals, one terminal of which is connected by way of said control resistor to one of said input terminals, the other output terminal being connected to the other input terminal, said output terminals to be connected in power supplying relation to a first electrical device having an on/off power switch; (d) a second pair of output terminals; (e) energizable means responsive to energization thereof for connecting said second pair of output terminals across said pair of input terminals; and (f) sensing and delay means including a high gain amplifier having an input connected across said control resistor for producing a voltage output in response to current caused to flow through said control resistor when the first electrical device is connected to said first pair of output terminals and its said on/off power switch is initially turned on, said sensing and delay means further including circuitry coupled to said high gain amplifier and responsive to said voltage output thereof for energizing said energizable means after a predetermined time delay elapses from the time that said high gain amplifier voltage output reaches a given threshold value, whereby power from said power source will then be supplied via said energizable means to said second pair of output terminals and to any second electrical device whose power input terminals are connected thereto.
Claim 3
Dependent Claim
103 words
A switching control circuit according to claim 1, wherein said energizing circuitry is additionally responsive to the voltage output of said high gain amplifier for deenergizing the energizable means after a second predetermined time delay elapses from the time that the high gain amplifier voltage output has diminished to a second given threshold value lower than the first given threshold value following turn-off of said power switch, whereby power from said power source will then cease to be supplied via said energizable means to said second pair of output terminals and to any second electrical device whose power input terminals are connected thereto.
Claim 4
Dependent Claim
28 words
A switching control circuit according to claim 1, wherein at least one additional pair of output terminals are connected in parallel with said second pair of output terminals.
Claim 5
Dependent Claim
28 words
A switching control circuit according to claim 2, wherein at least one additional pair of output terminals are connected in parallel with said second pair of output terminals.