Hydraulic bolster dampening device

Claim 2

In a motion damping device, the combination comprising A. a casing, B. a member within said casing defining a working chamber and conjointly with said casing defining a reservoir extending about said member, C. a piston including 1. a head operating in said working chamber and dividing the same into variable volume compression and compensating chambers, and 2. a rod extending upwardly from said head and through the top of said casing, D. spring means yieldably biasing said piston head upwardly to extend said piston rod, E. hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir, F. means valved for passage of said fluid from said compression chamber to said reservoir when said piston is retracted against the influence of said spring means and for passage of said fluid from said reservoir to said compression chamber when said piston is extended by said spring means, G. purging means in said compression chamber operable in response to retraction of said piston for expelling air from said compression chamber and forcing it into said reservoir, and H. a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod.

Claim 3

a rod extending upwardly from said head and through the top of said casing, D. spring means yieldably biasing said piston head upwardly to extend said piston rod, E. hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir, F. means valved for passage of said fluid from said compression chamber to said reservoir when said piston is retracted against the influence of said spring means and for passage of said fluid from said reservoir to said compression chamber when said piston is extended by said spring means, G. purging means in said compression chamber operable in response to retraction of said piston for expelling air from said compression chamber and forcing it into said reservoir, and H. a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod.

Claim 4

a rod extending upwardly from said head and through the top of said casing, D. spring means yieldably biasing said piston head upwardly to extend said piston rod, E. hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir, F. means valved for passage of said fluid from said compression chamber to said reservoir when said piston is retracted against the influence of said spring means and for passage of said fluid from said reservoir to said compression chamber when said piston is extended by said spring means, G. purging means in said compression chamber operable in response to retraction of said piston for expelling air from said compression chamber and forcing it into said reservoir, and H. a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod.

Claim 5

The combination according to claim 1 wherein the pruging means comprises a first tubular member extending upwardly from the bottom of the compression chamber, a second tubular member depending from the top of said compression chamber and extending downwardly into the upper end of said first tubular member, and means providing for free passage of fluid from said compression chamber into said second tubular member at the upper extremity thereof.

Claim 6

a rod extending upwardly from said piston head and slidably through the top of said casing, D. hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir, E. hydraulic fluid passage means provided with a fixed area orifice plate for a valve in a flow path from said compression chamber to said reservoir when said piston is retracted, F. a compression coil spring extending upwardly from the bottom of said compression chamber, through the piston head and into a hollow in the lower end portion of the piston rod, said spring being operative to yieldably urge said piston upwardly to extend the same, G. means for purging air from said compression chamber when said piston is retracted including

Claim 7

a rod extending upwardly from said piston head and slidably through the top of said casing, D. hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir, E. hydraulic fluid passage means provided with a fixed area orifice plate for a valve in a flow path from said compression chamber to said reservoir when said piston is retracted, F. a compression coil spring extending upwardly from the bottom of said compression chamber, through the piston head and into a hollow in the lower end portion of the piston rod, said spring being operative to yieldably urge said piston upwardly to extend the same, G. means for purging air from said compression chamber when said piston is retracted including

Claim 8

a cylindrical member within the upright cylindrical section of said casing, said member defining a working chamber and said member and casing conjointly defining a reservoir,

Claim 9

a cylindrical member within the upright cylindrical section of said casing, said member defining a working chamber and said member and casing conjointly defining a reservoir,

Claim 10

a bolster, and

Claim 11

a bolster, and

Claim 12

a member within said casing defining a working chamber and conjointly with said casing defining a reservoir extending about said member,

Claim 13

a member within said casing defining a working chamber and conjointly with said casing defining a reservoir extending about said member,

Claim 14

a second tubular member affixed by its upper extremity to the upper end portion of said piston rod and provided with an opening through the wall thereof close adjacent the upper end portion of said piston rod for passage of fluid from said compression chamber into the interior of said second tubular member, said second tubular member being axially aligned with and loosely telescoped into the upper end portion of said first tubular member, the upper extremity of said first tubular member being set back from the nearest obstruction to movement thereof into the hollow in the lower end portion of said piston rod a distance at least as great as the stroke of said piston, and the lower extremity of said second tubular member being set back from the nearest obstruction to movement thereof into said first tubular member a distance at least as great as the stroke of said piston, H. unvalved hydraulic fluid passage means providing for a restricted but continuous free flow of hydraulic fluid between said compression and compensating chambers in response to all movement of said piston in either direction, I. means for converting said fixed area orifice to a variable area orifice and progressively increasing said area and the consequent flow of hydraulic fluid from said compression chamber to said reservoir in response to retraction of said piston and the consequent increase of hydraulic fluid pressure in said compression chamber as it decreases in volume, J. valved hydraulic fluid passage means, the valve being operable for checking the flow of hydraulic fluid from said compression chamber to said reservoir through the associated passage means when the compression chamber is decreasing in volume, and being operable for opening and thereby permitting a free flow of hydraulic fluid from said reservoir to said compression chamber through the associated passage means when the compression chamber is increasing in volume, and K. a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod.

Claim 15

a second tubular member affixed by its upper extremity to the upper end portion of said piston rod and provided with an opening through the wall thereof close adjacent the upper end portion of said piston rod for passage of fluid from said compression chamber into the interior of said second tubular member, said second tubular member being axially aligned with and loosely telescoped into the upper end portion of said first tubular member, the upper extremity of said first tubular member being set back from the nearest obstruction to movement thereof into the hollow in the lower end portion of said piston rod a distance at least as great as the stroke of said piston, and the lower extremity of said second tubular member being set back from the nearest obstruction to movement thereof into said first tubular member a distance at least as great as the stroke of said piston, H. unvalved hydraulic fluid passage means providing for a restricted but continuous free flow of hydraulic fluid between said compression and compensating chambers in response to all movement of said piston in either direction, I. means for converting said fixed area orifice to a variable area orifice and progressively increasing said area and the consequent flow of hydraulic fluid from said compression chamber to said reservoir in response to retraction of said piston and the consequent increase of hydraulic fluid pressure in said compression chamber as it decreases in volume, J. valved hydraulic fluid passage means, the valve being operable for checking the flow of hydraulic fluid from said compression chamber to said reservoir through the associated passage means when the compression chamber is decreasing in volume, and being operable for opening and thereby permitting a free flow of hydraulic fluid from said reservoir to said compression chamber through the associated passage means when the compression chamber is increasing in volume, and K. a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod.

Claim 16

a bolster, and

Claim 17

a bolster, and

Claim 18

a piston including a. a head operating in said working chamber and dividing the same into variable volume compression and compensating chambers, and b. a rod extending upwardly from said head and through the top of said casing,

Claim 19

a piston including a. a head operating in said working chamber and dividing the same into variable volume compression and compensating chambers, and b. a rod extending upwardly from said head and through the top of said casing,

Claim 20

compression coil spring groups each carried by one of said frames and supporting the assoCiated end of said bolster, and C. unitary motion damping means each associated with one of said spring groups including

Claim 21

compression coil spring groups each carried by one of said frames and supporting the assoCiated end of said bolster, and C. unitary motion damping means each associated with one of said spring groups including

Claim 22

compression coil spring groups each carried by one of said frames and sUpporting the associated end of said bolster, and C. unitary motion damping means each associated with one of said spring groups including

Claim 23

compression coil spring groups each carried by one of said frames and sUpporting the associated end of said bolster, and C. unitary motion damping means each associated with one of said spring groups including

Claim 24

a piston including a. a head for operating in said working chamber and thereby dividing the same into a variable volume compression chamber under said piston head and a variable volume compensating chamber above said piston head, and b. a rod extending upwardly from said piston head and slidably through the top of said casing,

Claim 25

a piston including a. a head for operating in said working chamber and thereby dividing the same into a variable volume compression chamber under said piston head and a variable volume compensating chamber above said piston head, and b. a rod extending upwardly from said piston head and slidably through the top of said casing,

Claim 26

The combination according to claim 2 wherein the compression coil spring extends about the tubular members and upwardly from the bottom of the compression chamber, through the piston head and into a hollow in the lower end portion of the piston rod, and the second tubular member is affixed by its upper extremity to the upper end portion of said piston rod and provided with an opening through the wall thereof close adjacent to the upper end portion of said piston rod for passage of fluid from said compression chamber into the interior of said second tubular member.

Claim 27

The combination according to claim 3 wherein when the piston is retracted, the movements of the first tubular member into the hollow in the lower end portion of the piston rod and that of the second tubular member into said first tubular member are free and unobstructed at least for distances equal to the stroke of said piston.

Claim 28

hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir,

Claim 29

hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir,

Claim 30

spring means yieldably biasing said piston head upwardly to extend said piston rod,

Claim 31

spring means yieldably biasing said piston head upwardly to extend said piston rod,

Claim 32

hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir,

Claim 33

hydraulic fluid normally filling said compression and compensating chambers and partially filling said reservoir,

Claim 34

The combination according to claim 4 wherein the passage for fluid from the compression chamber to the reservoir includes the interior of the purging means.

Claim 35

hydraulic fluid passage means provided with a fixed area orifice plate for a valve in a flow path from said compression chamber to said reservoir when said piston is retracted,

Claim 36

hydraulic fluid passage means provided with a fixed area orifice plate for a valve in a flow path from said compression chamber to said reservoir when said piston is retracted,

Claim 37

The combination according to claim 5 wherein an orifice plate for a valve at the bottom of the compression chamber and in the fluid flow path from the compression chamber to the reservoir is axially aligned with the tubular members.

Claim 38

means valved for passage of said fluid from said compression chamber to said reservoir when said piston is retracted against the influence of said spring means and for passage of said fluid from said reservoir to said compression chamber when said piston is extended by said spring means,

Claim 39

means valved for passage of said fluid from said compression chamber to said reservoir when said piston is retracted against the influence of said spring means and for passage of said fluid from said reservoir to said compression chamber when said piston is extended by said spring means,

Claim 40

a compression coil spring extending upwardly from the bottom of said compression chamber, through the piston head and into a hollow in the lower end portion of the piston rod, said spring being operative to yieldably urge said piston upwardly to extend the same,

Claim 41

a compression coil spring extending upwardly from the bottom of said compression chamber, through the piston head and into a hollow in the lower end portion of the piston rod, said spring being operative to yieldably urge said piston upwardly to extend the same,

Claim 42

purging means in said compression chamber operable in response to retraction of said piston for expelling air from said compression chamber and forcing it into said reservoir, and

Claim 43

purging means in said compression chamber operable in response to retraction of said piston for expelling air from said compression chamber and forcing it into said reservoir, and

Claim 44

means for purging air from said compression chamber when said piston is retracted including a. a first tubular member axially aligned with the opening in said orifice plate and extending upwardly therefrom with said spring through said piston head into the hollow in the lower end portion of said piston rod, and b. a second tubular member affixed by its upper extremity to the upper end portion of said piston rod and provided with an opening through the wall thereof close adjacent the upper end portion of said piston rod for passage of fluid from said compression chamber into the interior of said second tubular member, said second tubular member being axially aligned with and loosely telescoped into the upper end portion of said first tubular member, the upper extremity of said first tubular member being set back from the nearest obstruction to movement thereof into the hollow in the lower end portion of said piston rod a distance at least as great as the stroke of said piston, and the lower extremity of said second tubular member being set back from the nearest obstruction to movement thereof into said first tubular member a distance at least as great as the stroke of said piston,

Claim 45

means for purging air from said compression chamber when said piston is retracted including a. a first tubular member axially aligned with the opening in said orifice plate and extending upwardly therefrom with said spring through said piston head into the hollow in the lower end portion of said piston rod, and b. a second tubular member affixed by its upper extremity to the upper end portion of said piston rod and provided with an opening through the wall thereof close adjacent the upper end portion of said piston rod for passage of fluid from said compression chamber into the interior of said second tubular member, said second tubular member being axially aligned with and loosely telescoped into the upper end portion of said first tubular member, the upper extremity of said first tubular member being set back from the nearest obstruction to movement thereof into the hollow in the lower end portion of said piston rod a distance at least as great as the stroke of said piston, and the lower extremity of said second tubular member being set back from the nearest obstruction to movement thereof into said first tubular member a distance at least as great as the stroke of said piston,

Claim 46

The combination according to claim 6 wherein the tubular members are concentrically related, and the lower end portion of the second tubular member fits loosely into the upper end portion of the first tubular member, the inside diameter of said first tubular member substantially greater than the outside diameter of said second tubular member.

Claim 47

In a motion daMping device, the combination comprising A. a casing provided with an upright cylindrical section, B. a cylindrical member within the upright cylindrical section of said casing, said member defining a working chamber and said member and casing conjointly defining a reservoir, C. a piston including

Claim 48

In a motion daMping device, the combination comprising A. a casing provided with an upright cylindrical section, B. a cylindrical member within the upright cylindrical section of said casing, said member defining a working chamber and said member and casing conjointly defining a reservoir, C. a piston including

Claim 49

unvalved hydraulic fluid passage emans providing for a restricted but continuous free flow of hydraulic fluid between said compression and compensating chambers in response to all movement of said piston in either direction,

Claim 50

unvalved hydraulic fluid passage emans providing for a restricted but continuous free flow of hydraulic fluid between said compression and compensating chambers in response to all movement of said piston in either direction,

Claim 51

a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod and coacting with the associated spring group to support the overlying end of said bolster.

Claim 52

a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod and coacting with the associated spring group to support the overlying end of said bolster.

Claim 53

means for converting said fixed area orifice to a variable area orifice and progressively increasing said area and the consequent flow of hydraulic fluid from said compression chamber to said reservoir in response to retraction of said piston and the consequent increase in hydraulic fluid pressure in said compression chamber as it decreases in volume,

Claim 54

means for converting said fixed area orifice to a variable area orifice and progressively increasing said area and the consequent flow of hydraulic fluid from said compression chamber to said reservoir in response to retraction of said piston and the consequent increase in hydraulic fluid pressure in said compression chamber as it decreases in volume,

Claim 55

In a railroad vehicle, the combination comprising A. a vehicle body, B. a pair of trucks respectively at opposite ends of said body, each including

Claim 56

In a railroad vehicle, the combination comprising A. a vehicle body, B. a pair of trucks respectively at opposite ends of said body, each including

Claim 57

valved hydraulic fluid passage means, the valve being operable for checking the flow of hydraulic fluid from said compression chamber to said reservoir through the associated passage means when the compression chamber is decreasing in volume, and being operable for opening and thereby permitting a free flow of hydraulic fluid from said reservoir to said compression chamber through the associated passage means when the compression chamber is increasing in volume, and

Claim 58

valved hydraulic fluid passage means, the valve being operable for checking the flow of hydraulic fluid from said compression chamber to said reservoir through the associated passage means when the compression chamber is decreasing in volume, and being operable for opening and thereby permitting a free flow of hydraulic fluid from said reservoir to said compression chamber through the associated passage means when the compression chamber is increasing in volume, and

Claim 59

The combination according to claim 9 wherein the purging means comprises a first tubular member extending upwardly from the bottom of the compression chamber, a second tubular member depending from the top of said compression chamber and extending downwardly into the upper end of said first tubular member, and means providing for free passage of fluid from said compression chamber into said second tubular member at the upper extremity thereof.

Claim 60

The combination according to claim 10 wherein the compression coil spring extends about the tubular members and upwardly from the bottom of the compression chamber, through the piston head and into a hollow in the lower end portion of the piston rod, and the second tubular member is affixed by its upper extremity to the upper end portion of said piston rod and provided with an opening through the wall thereof close adjacent to the upper end portion of said piston rod for passage of fluid from said compression chamber into the interior of said second tubular member.

Claim 61

a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod and coacting with the associated spring group to support the overlying end of said bolster.

Claim 62

a compression coil spring seated upon said casing and extending upwardly therefrom a substantial distance above the upper extremity of said piston rod and coacting with the associated spring group to support the overlying end of said bolster.

Claim 63

The combination according to claim 11 wherein when the piston is retracted, the movements of the first tubular member into the hollow in the lower end portion of the piston rod and those of the second tubular member into said first tubular member are free and unobstructed at least for distances equal to the stroke of said piston.

Claim 64

The combination according to claim 12 wherein the passage for fluid from the compression chamber to the reservoir includes the interior of the purging means.

Claim 65

The combination according to claim 13 wherein an orifice plate for a valve at the bottom of the compression chamber and in the fluid flow path from the compression chamber to the reservoir is axially aligned with the tubular members.

Claim 66

The combination according to claim 14 wherein the tubular members are concentrically related, and the lower end portion of the second tubular member fits loosely into the upper end portion of the first tubular member, the inside diameter of said first tubular member being substantially greater than the outside diameter of said second tubular member.

Claim 67

In a railroad vehicle, the combination comprising A. a vehicle body, B. a pair of trucks respectively at opposite ends of said body, each including

Claim 68

In a railroad vehicle, the combination comprising A. a vehicle body, B. a pair of trucks respectively at opposite ends of said body, each including