US3668666A — Flying head on pantograph assembly with pressure …

Claim 1

Independent Claim 510 words

A flying head transducer assembly for removably holding a magnetic head in close but non-contacting relationship to the recording surface of a moving data storage device comprising: a support structure held by arms positioned in a generally rigid pattern; means to mount a magnetic transducer head on said support; pressure load responsive means mounted on said support so as to be in locations corresponding to locations of said transducer head and adapted and arranged to create a signal at a predetermined high pressure between itself and said recording surfaces; means to maintain said transducer head away from, in a non-flying state, said recording surface; means to move said support to move said transducer head in close proximity, in the flying state, to said recording surface; means to hold said transducer head in said flying state and means responsive to said signal from said pressure responsive means to disable said means to hold and to move said support away from said recording surface. CM,2Sembly as defined in claim 1 wherein said support is rectangular and comprised: a front plate; a back plate; first, second, third and fourth cross arms connecting said front plate to said back plate in such a manner that said front plate is movable with respect to said back plate. CM,3Sembly as defined in claim 2 wherein said front plate has a rectangular slot cut out of the center thereof and said means to mount said transducer heads includes a head pad resiliently mounted in said rectangular slot. CM,4Sembly as defined in claim 3 wherein said head pad has a rectangular slot for receiving wires from said transducer heads. CM,5Sembly as defined in claim 4 wherein an adjustable differential spring assembly is provided to resiliently mount said head pad in said rectangular slot. CM,6Ing head transducer assembly for removably holding a magnetic head in close but non-contacting relationship to the recording surface of a moving data storage device comprising: a generally rectangular shaped support structure comprising a front plate; a back plate; first, second, third and fourth cross arms connecting said front plate to said back plate in such a manner that said front plate is movable with respect to said back plate; means to mount a magnetic transducer head on said support; means to maintain said transducer head away from, in a non-flying state, said recording surface; means to move said transducer head in close proximity, in the flying state, to said recording surface; and means to hold said transducer head in said flying state; said means to hold said transducer head in said non-flying state including a first torsion rod passing through one side of said back plate, said first torsion rod being secured at one end in said first cross arm and at its other end in the bottom edge of said back plate; and a second torsion rod passing through the other side of said back plate, said second torsion rod beiNg secured at one end in said second cross arm and at its other end in the bottom edge of said back plate.

Claim 2

Dependent Claim 22 words

An assembly as defined in claim 6 wherein said means to move said transducer heads into said flying state is electrically controlled.

Claim 3

Dependent Claim 25 words

An assembly as defined in claim 7 wherein said means to hold said transducer heads in said flying state includes an electrically controlled latch arrangement.

Claim 4

Dependent Claim 481 words

A flying transducer head assembly comprising: a pantograph type structure having at least one transducer head mounted thereon; and means for holding said head in the non-flying position wherein fail-safe means are provided to prevent said transducer heads from contacting said recording surface when said heads are in said flying state said fail-safe means, said means to move said heads into said flying state and said means for holding said heads in said flying state comprising: a first switch having first and second contacts; a second switch having first and second contacts; means to connect said first contact of said first switch to said first contact of said second switch; means to connect said second contact of said second switch to said second contact of said first switch; first and second terminals connected to a source of voltage; means to connect said first terminal to said first contacts of said second switch; an amplifier having an input and an output; a tension sensitive resistance connected between said amplifier input and said second contact of said second switch; a solenoid having a movable arm and a coil connected between said amplifier output and said second terminal; a sensor to sense the speed of rotation of said data storage device, said data storage device being driven by a motor having first and second power input terminal; means to connect said sensor between said second contact of said second switch and said first motor input terminal; means to connect said second motor input terminal to said second terminal; an interlock device; a diode having a cathode and an anode; means to connect said interlock device between said sensor and the cathode of said diode, a second solenoid type device having an arm; a third switch having first, second,third and fourth contacts; means to connect said second solenoid type device between said first contact of said third switch and the anode of said diode; means to connect said second contact of said third switch to said second terminal; means to connect said third contact of said third switch to said second contact of said second switch; indicating means connected between said fourth contact of said third switch and said second terminal; means coupling said second switch and said solenoid such that said first and second contacts of said second switch are electrically connected when said solenoid is energized and disconnected when said solenoid is deenergized; means integral with said support structure for engaging said arm of said first solenoid when said heads are in said flying position and said solenoid is energized; and means for connecting said third contact of said third switch to said fourth contact of said third switch when said heads are in said flying position and for connecting said first contact of said third switch to said second contact of said third switch when said heads are in the non-flying position.

Claim 5

Dependent Claim 481 words

A flying transducer head assembly comprising: a pantograph type structure having at least one transducer head mounted thereon; and means for holding said head in the non-flying position wherein fail-safe means are provided to prevent said transducer heads from contacting said recording surface when said heads are in said flying state said fail-safe means, said means to move said heads into said flying state and said means for holding said heads in said flying state comprising: a first switch having first and second contacts; a second switch having first and second contacts; means to connect said first contact of said first switch to said first contact of said second switch; means to connect said second contact of said second switch to said second contact of said first switch; first and second terminals connected to a source of voltage; means to connect said first terminal to said first contacts of said second switch; an amplifier having an input and an output; a tension sensitive resistance connected between said amplifier input and said second contact of said second switch; a solenoid having a movable arm and a coil connected between said amplifier output and said second terminal; a sensor to sense the speed of rotation of said data storage device, said data storage device being driven by a motor having first and second power input terminal; means to connect said sensor between said second contact of said second switch and said first motor input terminal; means to connect said second motor input terminal to said second terminal; an interlock device; a diode having a cathode and an anode; means to connect said interlock device between said sensor and the cathode of said diode, a second solenoid type device having an arm; a third switch having first, second,third and fourth contacts; means to connect said second solenoid type device between said first contact of said third switch and the anode of said diode; means to connect said second contact of said third switch to said second terminal; means to connect said third contact of said third switch to said second contact of said second switch; indicating means connected between said fourth contact of said third switch and said second terminal; means coupling said second switch and said solenoid such that said first and second contacts of said second switch are electrically connected when said solenoid is energized and disconnected when said solenoid is deenergized; means integral with said support structure for engaging said arm of said first solenoid when said heads are in said flying position and said solenoid is energized; and means for connecting said third contact of said third switch to said fourth contact of said third switch when said heads are in said flying position and for connecting said first contact of said third switch to said second contact of said third switch when said heads are in the non-flying position.

Claim 6

Dependent Claim 177 words

An electronic circuit for selectively positioning magnetic transducer heads in close proximity to a moving recording surface and for removing said magnetic transducers away from said recording surface comprising: means to sense the speed of said moving recording surface and produce an output when said moving recording surface has reached a predetermined speed; means responsive to said output from said speed sensing means to cause said transducer heads to move into close proximity to said recording surface only when said moving recording surface has reached said predetermined speed; means for sensing the pressure loading on said transducer heads when said transducer heads are in Close proximity to said recording surface, said means for sensing loading being mounted so as to be in locations corresponding to locations of said transducer heads, and means responsive to said load sensing means for automatically moving said transducer heads away from said close proximity to said recording surface when said loading on said heads exceeds a predetermined safe level and wherein means are provided to selectively short out said load sensing means.

Claim 7

Dependent Claim 177 words

An electronic circuit for selectively positioning magnetic transducer heads in close proximity to a moving recording surface and for removing said magnetic transducers away from said recording surface comprising: means to sense the speed of said moving recording surface and produce an output when said moving recording surface has reached a predetermined speed; means responsive to said output from said speed sensing means to cause said transducer heads to move into close proximity to said recording surface only when said moving recording surface has reached said predetermined speed; means for sensing the pressure loading on said transducer heads when said transducer heads are in Close proximity to said recording surface, said means for sensing loading being mounted so as to be in locations corresponding to locations of said transducer heads, and means responsive to said load sensing means for automatically moving said transducer heads away from said close proximity to said recording surface when said loading on said heads exceeds a predetermined safe level and wherein means are provided to selectively short out said load sensing means.

Claim 8

Dependent Claim 77 words

A flying transducer head assembly comprising: a pantograph type structure comprised of pivoted arms having at least one transducer head mount thereon; and means for holding said head in the non-flying position, wherein said pantograph type structure comprises a back plate, a front plate having a movable transducer head pad mounted thereon, two movable upper cross arms connected between said front and back plates and two movable lower cross arms connected between said front and back plates.

Claim 9

Dependent Claim 77 words

A flying transducer head assembly comprising: a pantograph type structure comprised of pivoted arms having at least one transducer head mount thereon; and means for holding said head in the non-flying position, wherein said pantograph type structure comprises a back plate, a front plate having a movable transducer head pad mounted thereon, two movable upper cross arms connected between said front and back plates and two movable lower cross arms connected between said front and back plates.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-06-06	1975-12-06	1976-06-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-06-06	1979-12-06	1980-06-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-06-06	1983-12-06	1984-06-06	$7700.00	Window Closed / Lapsed

Flying head on pantograph assembly with pressure responsive withdrawal

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