Communication Into Piston Through Peripheral Port Patents (Class 91/226)
  • Patent number: 9057482
    Abstract: The auto/single functions selecting device of a grease gun includes a switch unit connected to the main body of the grease gun. When the user switches the switch unit to the first position, a single shot is available when pulling the trigger one time. When the user switches the switch unit to the second position, the grease is continuously supplied when keep pulling the trigger. The grease gun provides the function of single shot and the function of auto shot.
    Type: Grant
    Filed: June 23, 2012
    Date of Patent: June 16, 2015
    Inventor: Fu-Tien Hung
  • Patent number: 7147442
    Abstract: An automatic oil pump includes a drive chamber, having a reciprocal driving device, and an oil chamber, having a sucking device, located on two sides of a main body. The reciprocal driving device has a piston unit having a valve chamber at its center and a balance valve and is pushed by a spring. The drive chamber has grooves on its inside wall. The piston unit has two channels, allowing air to flow into the valve chamber past two sides of the piston unit. On the piston unit is a driving rod. The driving rod penetrates into the main body and reaches into the oil chamber. A hermetic cover and a movable piston are attached to an end of the driving rod. On the wall of the piston are pluralities of through holes. The reciprocal driving device drives the piston in the oil chamber to move reciprocally, so oil is sucked into and out of the oil chamber continuously. Thereby, oil sucking speed and volume are upgraded to save time and labor, and oil pumping efficiency is enhanced.
    Type: Grant
    Filed: May 22, 2003
    Date of Patent: December 12, 2006
    Inventor: Kuo-Chung Yeh
  • Patent number: 5683230
    Abstract: A pressure medium operated device generating to-and-fro motion to one or several pistons or a similar motion transmitting arm. The device includes a primary piston to which motion is brought in transmitting pressure medium alternately to both sides of the piston and control valves located inside the primary piston for controlling the pressure medium which moves the primary piston.
    Type: Grant
    Filed: January 23, 1997
    Date of Patent: November 4, 1997
    Inventor: Reijo Karppinen
  • Patent number: 5341723
    Abstract: A reciprocating pneumatic motor for hydraulics has a pair of guide grooves on the inner wall of a cylinder provided, together with a pneumatic piston and a shuttle valve to function pneumatically. The piston has a seal ring which passes the guide grooves to allow air to flow into the shuttle compression chamber, pushing the shuttle valve and opening up a channel for the venting of air. This continuous air flow and venting causes the piston to reciprocate. In addition, the piston is integrated with a ring plate using plastic ultrasound technology which simplifies the structure of the pneumatic motor.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: August 30, 1994
    Inventor: Michael Hung
  • Patent number: 5197285
    Abstract: A modular digital actuator is formed by interconnecting a plurality of modules. Each of the modules includes a housing having a pair of different sized axially extending cylinder sections in which is received a T-shaped piston with the top of the T mating with the larger cylinder and the leg of the T forming a piston in the smaller cylinder. The leg of the T is hollow and forms a cylinder to receive an axially extending piston forming shaft to thereby provide three preferably different sized cooperating piston and cylinder areas, one formed in the cavity or hollows of the leg of the T, a second formed between the top of the T surrounding the leg of the T and the junction between the larger cylinder section and smaller cylinder section and the third formed in the smaller cylinder section between a closed free end of the smaller cylinder section and the leg of the T surrounding the piston forming shaft. The top of the T forms a piston wall in a fourth hydraulic cavity.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: March 30, 1993
    Assignee: The University of British Columbia
    Inventor: Andrew B. Dunwoody
  • Patent number: 5136926
    Abstract: A vibration generator including an inertial body and a housing which are relatively movable and where hydraulic fluid is directed into the inertial body through a control valve mounted in the inertial body, the fluid being directed alternately into one or another working chamber which causes oscillation of the housing and any attached load. A wave form shape of pressure or flow rate of the hydraulic fluid flow is detected and used to control the frequency at which the vibration generator oscillates so that the frequency is maintained at a resonant frequency. The device has particular application in a frequency range of 20 Hertz to 1000 Hertz.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: August 11, 1992
    Inventors: David A. Bies, Stewart Page
  • Patent number: 4846634
    Abstract: Disclosed is a device for converting pressure fluid input of one fluid to pressure fluid output of a second fluid without contaminating either fluid. The transformation is accomplished by a unique H section piston which cooperates the internally protruding endcaps enclosed in a double ended cylinder; the piston having a central control valve which reverses the piston on control pin end of stroke contact. Positive reverse action is obtained by means of endcap plungers which operate in response to piston position and pressure of the one fluid. The device is double acting and is enclosed totally within a single cylindrical module which is compact and inexpensive to manufacture.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: July 11, 1989
    Assignee: Ingersoll-Rand Company
    Inventors: Godfrey G. Vos, Derek E. Newman, Leland H. Lyon
  • Patent number: 4588424
    Abstract: A fluid pumping system for use with a natural gas dehydrating system or the like having an absorber apparatus for removing water from wet natural gas to produce dry natural gas by use of a desiccant agent such as glycol, and a glycol treater apparatus for producing a source of dry glycol from wet glycol received from the absorber apparatus including a main body having a control bore therethrough for receiving an elongate piston shaft; an elongate main piston shaft reciprocally slideably mounted in the central bore; first and second cylinders removeably mounted on opposite sides of the main body in annular centered relationship with respect to the piston shaft; first and second main pistons mounted at opposite ends of the piston shaft and sealingly slidingly received within the first and second cylinders, each piston dividing an associated cylinder cavity into a dry glycol pumping chamber and a wet glycol driving chamber; and each dry glycol pumping chamber being operatively associated with a pumping chamber i
    Type: Grant
    Filed: October 16, 1984
    Date of Patent: May 13, 1986
    Inventors: Rodney T. Heath, Charles R. Gerlach
  • Patent number: 4402652
    Abstract: A liquid motor is driven by pressurized wet glycol, received from an absorber of a natural gas dehydrating system, and utilizes the energy of the pressurized wet glycol to provide the primary source of energy for operating a pump for pumping of dry glycol from a reboiler to the absorber. A gas driven motor regulates the stroking rate of the glycol driven motor. The liquid motor and pump each have a two stage double acting piston in cylinders with fluid intake and exhaust valving and passages to alternately fill and exhaust the motor cylinders while the opposing pump cylinders are simultaneously alternately filled and exhausted. A spool type valve rod, associated with the glycol driven motor, is operated by the gas driven motor to regulate the rate of reciprocation of the glycol driven motor and to provide a secondary source of energy therefor.
    Type: Grant
    Filed: June 25, 1981
    Date of Patent: September 6, 1983
    Inventors: Charles R. Gerlach, Rodney T. Heath
  • Patent number: 4286929
    Abstract: A cylindrical shell with a double acting piston, having a high pressure area and a low pressure area on each side thereof, is provided with a valve for alternately injecting high pressure gas to each small area to provide an initial piston drive, and valving for injecting gas under the pressure, opposite from the first high pressure end to the opposite larger area providing a secondary piston drive using expansion of the high pressure expanded gas from the opposite end of the piston. In reversing the piston, the opposite end becomes the drive end in the same manner. In one form, a two position slide valve, initially actuated by piston movement and completed by gas pressure movement, provides a transfer means for gas streams internally of the motor and for exhaust of the secondary expanded gas. The valve is arranged for an initial mechanical movement from one position toward the other position by contact with the end wall of the low pressure cylinder and then completely moved to other position by gas pressure.
    Type: Grant
    Filed: May 7, 1979
    Date of Patent: September 1, 1981
    Assignee: Rodney T. Heath
    Inventors: Rodney T. Heath, C. Richard Gerlach