公开(公告)号：US5927178A

公开(公告)日：1999-07-27

申请号：US976775

申请日：1997-11-24

Applicant: Sven Stenquist

Inventor： Sven Stenquist

IPC: B30B1/00 ,  F15B1/02 ,  F15B1/24 ,  F15B7/08 ,  F01B7/20 ,  F15B21/04

CPC classification number: B30B1/007 ,  F15B1/02 ,  F15B1/24 ,  F15B7/08 ,  F15B2201/205 ,  F15B2201/21 ,  F15B2201/215 ,  F15B2201/312 ,  F15B2201/32 ,  F15B2201/413 ,  F15B2201/4155

Abstract: A hydraulic actuator for a hydraulically driven device has a hydraulic cylinder, a first piston slidably received for reciprocation within the cylinder and defining a hydraulic fluid chamber with the cylinder, a second piston slidably received for reciprocation within a cavity in an actuator rod connected to the first piston and defining a gas chamber on one side of the second piston and an accumulator chamber on the other side of the second piston. A passage formed in the first piston communicates the hydraulic chamber with the accumulator chamber and a pressure relief valve selectively permits hydraulic fluid flow through the passage from the hydraulic chamber to the accumulator chamber to limit the maximum pressure of the hydraulic fluid within the hydraulic chamber and the hydraulically driven device. Preferably, during normal operation of the actuator and the hydraulically driven device the pressure of the hydraulic fluid is less than that required to open the pressure relief valve. The pressure of the gas in the gas chamber and acting on the second piston forces hydraulic fluid in the accumulator chamber into the hydraulic fluid chamber through a check valve when the pressure in the accumulator chamber is greater than the pressure in the hydraulic fluid chamber to reset the accumulator.

Abstract translation: 用于液压驱动装置的液压致动器具有液压缸，第一活塞可滑动地容纳以用于在缸内往复运动并且限定具有缸的液压流体室;第二活塞，其可滑动地容纳在与连接到所述缸的致动器杆内的空腔内往复运动 第一活塞并且在第二活塞的一侧上限定一个气室，在第二活塞的另一侧限定一个储气室。 形成在第一活塞中的通道将液压室与蓄能室连通，并且压力释放阀选择性地允许液压流体流过从液压室到蓄能室的通道，以限制液压室内的液压流体的最大压力， 液压驱动装置。 优选地，在致动器和液压驱动装置的正常操作期间，液压流体的压力小于打开压力释放阀所需的压力。 气室中的气体作用在第二活塞上的压力当蓄能室中的压力大于液压室中的压力以复位时，通过止回阀迫使蓄能室中的液压流体进入液压腔室 蓄能器。

公开(公告)号：US20060033248A1

公开(公告)日：2006-02-16

申请号：US10918030

申请日：2004-08-13

Applicant: Sven Stenquist

Inventor： Sven Stenquist

IPC: F16F5/00

CPC classification number: F16F9/36 ,  F16F9/0218

Abstract: A gas spring with a piston rod assembly received for movement between retracted and extended positions in a casing defining a main gas chamber. The piston rod assembly when in its extended position cooperates with a portion of its retainer and the casing to at least in part provide a secondary gas chamber separate from the main gas chamber and having gas trapped therein at a higher pressure than that of gas in the main gas chamber to reduce the force required to initially move the piston rod assembly from its fully extended position toward its retracted position.

Abstract translation: 一个气弹簧，其具有活塞杆组件，该活塞杆组件用于在限定主气体室的壳体中的缩回位置和伸出位置之间运动。 活塞杆组件处于其延伸位置时与其保持器和壳体的一部分配合，以至少部分地提供与主气体室分离的第二气体室，并且在其中以比在 主气室以减小将活塞杆组件从其完全延伸位置向其缩回位置最初移动所需的力。

公开(公告)号：US5823513A

公开(公告)日：1998-10-20

申请号：US874256

申请日：1997-06-13

Applicant: Sven Stenquist

Inventor： Sven Stenquist

IPC: F16F9/06 ,  F16F9/02 ,  F16F9/48 ,  F16F9/49 ,  F16F5/00

CPC classification number: F16F9/0218 ,  F16F9/0245 ,  F16F9/49

Abstract: A gas spring that momentarily dwells in its retracted position after the retraction force is removed. The gas spring has a casing, a first piston received within the casing, a piston rod protruding from the casing and connected to the first piston, and a second piston received within the casing. A compressible gas is received within the casing between the second piston and the other end of the casing. A hydraulic fluid is received within the casing between the first and second pistons and between the first piston and the one end of the casing. A delay valve and a check valve carried by the first piston controllably transfer hydraulic fluid between the two fluid chambers, the delay valve causing the first piston and rod to dwell in the retracted position by delaying the free transfer of fluid between chambers.

Abstract translation: 在退回力消除后，气弹簧暂时停留在缩回位置。 气弹簧具有壳体，容纳在壳体内的第一活塞，从壳体突出并连接到第一活塞的活塞杆，以及容纳在壳体内的第二活塞。 壳体内的可压缩气体被容纳在第二活塞和壳体的另一端之间。 液压流体在壳体内容纳在第一和第二活塞之间以及第一活塞和壳体的一端之间。 由第一活塞携带的延迟阀和止回阀在两个流体室之间可控地传递液压流体，延迟阀通过延迟腔室之间的流体的自由传递而使第一活塞和杆停留在缩回位置。

公开(公告)号：US06295813B1

公开(公告)日：2001-10-02

申请号：US09325090

申请日：1999-06-03

Applicant: Sven Stenquist

Inventor： Sven Stenquist

IPC: F15B704

CPC classification number: F15B1/24 ,  B30B1/007 ,  B30B1/32 ,  F15B1/02 ,  F15B7/00 ,  F15B7/08 ,  F15B11/028 ,  F15B2201/205 ,  F15B2201/21 ,  F15B2201/215 ,  F15B2201/312 ,  F15B2201/32 ,  F15B2201/413 ,  F15B2201/4155 ,  F15B2211/7121 ,  F15B2211/76 ,  F15B2211/7716

Abstract: For a hydraulically actuated device a hydraulic power cylinder with an actuator slidably received for reciprocation within the cylinder and a piston slidably received for reciprocation within a sleeve of the actuator and defining a gas chamber on one side of the piston and a hydraulic fluid chamber on the other side of the piston so that the maximum pressure in the hydraulic fluid chamber is limited as a function of the force of compressed gas in the gas chamber acting on the piston. In this way, the maximum system pressure is a function of and substantially corresponds to the pressure of the compressed gas within the gas chamber and acting on the piston. Desirably, the pressure of the compressed gas in the gas chamber can be readily changed to change the maximum hydraulic fluid pressure.

Abstract translation: 对于液压致动装置，液压动力缸具有可滑动地容纳用于在气缸内往复运动的致动器的致动器，以及可滑动地容纳的活塞，用于在致动器的套筒内往复运动并在活塞的一侧上限定一个气室， 活塞的另一侧，使得液压流体室中的最大压力受到作用在活塞上的气体室中的压缩气体的力的作用的限制。 以这种方式，最大系统压力是气体室内的压缩气体的压力并且基本上对应于作用在活塞上的压力的函数。 理想地，可以容易地改变气室中的压缩气体的压力以改变最大液压流体压力。

公开(公告)号：US07331570B2

公开(公告)日：2008-02-19

申请号：US10918030

申请日：2004-08-13

Applicant: Sven Stenquist

Inventor： Sven Stenquist

IPC: F16F9/36 ,  F16F9/14

CPC classification number: F16F9/36 ,  F16F9/0218

Abstract: A gas spring with a piston rod assembly received for movement between retracted and extended positions in a casing defining a main gas chamber. The piston rod assembly when in its extended position cooperates with a portion of its retainer and the casing to at least in part provide a secondary gas chamber separate from the main gas chamber and having gas trapped therein at a higher pressure than that of gas in the main gas chamber to reduce the force required to initially move the piston rod assembly from its fully extended position toward its retracted position.

Abstract translation: 一个气弹簧，其具有活塞杆组件，该活塞杆组件用于在限定主气体室的壳体中的缩回位置和伸出位置之间运动。 活塞杆组件处于其延伸位置时与其保持器和壳体的一部分配合，以至少部分地提供与主气体室分离的第二气体室，并且在其中以比在 主气室以减小将活塞杆组件从其完全延伸位置向其缩回位置最初移动所需的力。

公开(公告)号：US06491143B1

公开(公告)日：2002-12-10

申请号：US09645683

申请日：2000-08-24

Applicant: Sven Stenquist

Inventor： Sven Stenquist

IPC: F16F906

CPC classification number: F16F9/49 ,  F16F9/0218

Abstract: A spring having a main gas chamber, a secondary gas chamber and sealing surfaces which, during a portion of the stroke of the piston rod, define a gas tight seal between them to provide two separate gas chambers each providing a force acting on the piston rod in opposed directions to each other to reduce the net force on the piston rod. When the piston rod is near its fully extended position the sealing surfaces provide the gas tight seal and the net force on the piston rod is minimal and in the direction to move the piston rod to its fully extended position. Thus, until the cooperating surfaces are displaced to terminate the gas tight seal, only a slight force is required to initially move the piston rod from its fully extended position. This greatly reduces the impulse or impact force imparted to a press ram upon initial actuation of the fully extended piston rod. A second seal assembly may also be provided which controls the rate at which the piston rod assembly returns to its fully extended position. After the gas tight seal is terminated, the gas spring functions generally as a conventional gas spring with a single gas pressure acting on the piston rod and biasing the piston rod towards its extended position against the force of the ram displacing it.

Abstract translation: 具有主气室，次气室和密封表面的弹簧，其在活塞杆的行程的一部分期间在它们之间限定气密密封，以提供两个单独的气室，每个提供作用在活塞杆上的力 在彼此相反的方向上，以减小活塞杆上的净力。 当活塞杆接近其完全伸出位置时，密封表面提供气密密封，并且活塞杆上的净力是最小的，并且将活塞杆移动到其完全伸出位置的方向。 因此，直到合作表面移位以终止气密密封，才需要稍微的力来使活塞杆从其完全伸出位置移动。 这大大减少了在完全延伸的活塞杆的初始致动时施加到压力冲头的冲击力或冲击力。 还可以提供第二密封组件，其控制活塞杆组件返回其完全伸出位置的速率。 在气密封被终止之后，气弹簧通常作为传统的气弹簧起作用，其中单一的气体压力作用在活塞杆上，并且克服其移动的压头的力将活塞杆偏压到其伸出位置。