US5067684A — Vibration-isolating machine mount

Claim 1

Independent Claim 136 words

In a suspension having one mass arranged to move relatively toward and away from another mass, and having a spring an damper arranged in parallel with one another to act between said masses, said damper having first and second opposed chambers communicating with one another through a restricted orifice, the improvement which comprises: fluid displacement generating means operatively arranged to selectively create a desired net pressure differentail across said orifice, said fluid generating means including a fluid pump having opposide first and second chambers, said pump first chamber communicating with said damper first chamber and said pump second chamber communicating with said damper second chamber, each of said chambers being filled with fluid, and an actuator operatively arranged to controllable vary the volumes of said pump chambers to create said net pressure differential across said orifice.

Claim 2

Dependent Claim 136 words

In a suspension having one mass arranged to move relatively toward and away from another mass, and having a spring an damper arranged in parallel with one another to act between said masses, said damper having first and second opposed chambers communicating with one another through a restricted orifice, the improvement which comprises: fluid displacement generating means operatively arranged to selectively create a desired net pressure differentail across said orifice, said fluid generating means including a fluid pump having opposide first and second chambers, said pump first chamber communicating with said damper first chamber and said pump second chamber communicating with said damper second chamber, each of said chambers being filled with fluid, and an actuator operatively arranged to controllable vary the volumes of said pump chambers to create said net pressure differential across said orifice.

Claim 3

Dependent Claim 36 words

The improvement as set forth in claim 1 wherein said fluid displacement generating means is aranged to reduce the dynamic force attributable to such relative motion transmitted through at least one of said spring and damper.

Claim 4

Dependent Claim 40 words

The improvement as set forth in claim 1 wherein said fluid displacement generating means is arranged to create such pressure differential to oppose and substantially cancel the dynamic force attributable to such relative motion transmitted through said spring and chamber.

Claim 5

Dependent Claim 24 words

The improvement as set forth in claim 1 wherein said fluid displacement generating means includes an actuator arranged mechanically in series with said damper.

Claim 6

Dependent Claim 20 words

The improvement as set forth in claim 1 wherein said spring and damper are provided in an elastically-deformable fluid enclosure.

Claim 7

Dependent Claim 14 words

The improvement as set forth in claim 1 wherein said actuator is hydraulically driven.

Claim 8

Dependent Claim 27 words

The improvement as set forth in claim 1 wherein said fluid displacement generating means is arranged to create said net pressure differential only above a predetermined frequency.

Claim 9

Dependent Claim 38 words

The improvement as set forth in claim 1 wherein said fluid displacement generating means is arranged to create said net pressure differential to oppose and substantially cancel the dynamic force transmitted through said suspension above said predetermined frequency.

Claim 10

Dependent Claim 28 words

The improvement as set forth in claim 7 wherein said fluid displacement generating means does not create an incremental pressure differential across said orifice below said predetermined frequency.

Claim 11

Dependent Claim 48 words

The improvement as set forth in claim 1 wherein said fluid displacement generating means is arranged to create a pressure differential across said orifice which is summed with the pressure differential across said orifice attributable to said relative movement between said members to create said net pressure differential.

Claim 12

Dependent Claim 15 words

The improvement as set forth in claim 1 wherein said pump is a piston-and-cylinder arrangement.

Claim 13

Dependent Claim 19 words

The improvement as set forth in claim 1 wherein said actuator is a short-stroke variable air gap electromagnetic motor.

Claim 14

Dependent Claim 44 words

The improvement as set forth in claim 1 wherein said pump is operated to exert a force on said masses similar to, but substantually 180° out-of-phase with respect to, the waveform of the total dynamic force attributable to such relative movement between said masses.

Claim 15

Dependent Claim 29 words

The improvement as set forth in claim 7 wherein said predetermined frequency is established by appropriate selection of the pump piston area, the orifice size, and the spring stiffness.

Claim 16

Independent Claim 139 words

The method of operating a suspension having one mass arranged to move relatively toward and away from another mass, and having a spring and damper arranged in parallel with one another to act between said masses, said damper having first and second opposed chambers communication with one another through a restricted orifice and having a fluid pump having opposed first and second chambers, said first pump chamber communicating with said damper first chamber and said pump second chamber communicating with said damper second chamber, each of said chambers being filled with fluid, and having an actuator operatively arranged to controllable vary the volumes of said pump chamber to create said net pressure differential across said orifice, which method comprises the steps of: operating said actuator to cause said pump to selectively create a desired pressure differential across said orifice.

Claim 17

Independent Claim 139 words

The method of operating a suspension having one mass arranged to move relatively toward and away from another mass, and having a spring and damper arranged in parallel with one another to act between said masses, said damper having first and second opposed chambers communication with one another through a restricted orifice and having a fluid pump having opposed first and second chambers, said first pump chamber communicating with said damper first chamber and said pump second chamber communicating with said damper second chamber, each of said chambers being filled with fluid, and having an actuator operatively arranged to controllable vary the volumes of said pump chamber to create said net pressure differential across said orifice, which method comprises the steps of: operating said actuator to cause said pump to selectively create a desired pressure differential across said orifice.

Claim 18

Independent Claim 142 words

The method of controlling the transmission of forces through a suspension having a spring and damper arranged in parallel with one another to act between two masses which are mounted for relative movement toward and away from one another, said damper having a restricted orifice communicating opposing chambers, said suspension also having a motor-drivien pump provided with opposed first and second chambers, said pump first chamber communicating with said damper first chamber and said pump second chamber communicating with said damper second chamber, each of said chambers being filled with fluid, comprising the steps of: operating said pump to create a desired incremental pressure differential across said orifice above a predetermined frequency; and effectively decoupling said pump from said damper below said predetermined frequency; thereby to allow excursion of the damper below said frequency substantially unimpeded by the operation of said pump.

Claim 19

Independent Claim 142 words

The method of controlling the transmission of forces through a suspension having a spring and damper arranged in parallel with one another to act between two masses which are mounted for relative movement toward and away from one another, said damper having a restricted orifice communicating opposing chambers, said suspension also having a motor-drivien pump provided with opposed first and second chambers, said pump first chamber communicating with said damper first chamber and said pump second chamber communicating with said damper second chamber, each of said chambers being filled with fluid, comprising the steps of: operating said pump to create a desired incremental pressure differential across said orifice above a predetermined frequency; and effectively decoupling said pump from said damper below said predetermined frequency; thereby to allow excursion of the damper below said frequency substantially unimpeded by the operation of said pump.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-11-25	1995-05-27	1995-11-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-11-25	1999-05-27	1999-11-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-11-25	2003-05-27	2003-11-26	$7700.00	Window Closed / Lapsed

Vibration-isolating machine mount

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