Pneumatic Device Having Pulse Air Bleed Or Supply Means Patents (Class 60/542)
  • Patent number: 9050712
    Abstract: A driving tool having first and second linear motors, a head assembly, a nosepiece and a driver. The first linear motor forms an air compressor and includes a scotch yoke mechanism for translating a first piston in a first cylinder. The scotch yoke mechanism includes a crank arm, a crank arm roller, which is coupled to the crank arm, and a connecting rod having a roller slot into which the crank arm roller is received. At least a portion of the roller slot is configured to vary an output rate at which the connecting rod translates along a translation axis relative to an input rate at which the crank arm roller moves in a direction that is parallel to the translation axis.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: June 9, 2015
    Assignee: BLACK & DECKER INC.
    Inventor: David C. Campbell
  • Patent number: 5159814
    Abstract: An impulse motor for a hand held hammer machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to impact on and to return from a tool (20) carried by the machine housing (10). The drive piston (40) has an axially protruding reduced diameter damping piston (50) thereon adapted to prevent piston encounter collision by arresting the return movement of said hammer piston (15) towards the drive piston (40) in a cooperating damping cylinder (51) provided on the hammer piston (15). The damping piston (50) has two diameterical steps (64,65) formed thereon, of which an outer step (64) is long and has a clearance relative to said damping cylinder (51) enabling during arresting a braking action therebetween by gas friction in said clearance.
    Type: Grant
    Filed: October 26, 1990
    Date of Patent: November 3, 1992
    Assignee: Berema Aktiebolag
    Inventor: Gunnar S. Jakobsson
  • Patent number: 4932479
    Abstract: A vacuum-compression type percussion power tool comprises a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric motor, or any other suitable drive, a working tool (24) installed in the front part of the power tool, and a floating striker (34) which slides inside cylinder (14) in a space between a tail portion (26) of working tool (24) and the lower end of the piston. The power tool has a sealed auxiliary chamber (54, 56) , which is formed by a hollow casing (48) which surrounds the cylinder, and a space below striker (34). The auxiliary chamber is connected to a main working chamber (38), which is formed between the piston and the striker, through a set of compensation holes (44) and a set of idle-stroke holes (46). The power tool has a pumping chamber (27) which is formed in the upper part of cylinder (14) between the upper end face of piston (16) and a closed cover (17).
    Type: Grant
    Filed: May 5, 1988
    Date of Patent: June 12, 1990
    Inventor: Vladimir Pyatov
  • Patent number: 4828046
    Abstract: A vacuum-compression type percussion power tool comprising a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric motor, or any other suitable drive, a working tool (24) installed in the front part of the power tool, and a floating striker (34) which slides inside the cylinder (14) in a space between a tail portion (26) of the working tool (24) and the lower end of the piston.
    Type: Grant
    Filed: April 28, 1988
    Date of Patent: May 9, 1989
    Inventor: Vladimir Pyatov
  • Patent number: 4823886
    Abstract: A vacuum-compression type percussion power tool comprising a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric motor, or any other suitable drive, a working tool (24) installed in the front part of the power tool, and a floating striker (34) which slides inside the cylinder (14) in a space between a tail portion (26) of working tool (24) and the lower end of the piston. The power tool has a sealed auxiliary chamber (54, 56) which is formed by means of a hollow casing (48) which surrounds the cylinder, and a space below the striker (34). The auxiliary chamber is connected to a main working chamber (38), which is formed between the piston and a striker, through a set of compensation holes (44) and a set of idle-stroke holes (46). A check valve (51) is installed in the wall of the auxiliary chamber.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: April 25, 1989
    Inventor: Vladimir Pyatov
  • Patent number: 4346768
    Abstract: The rotary output of the power source of an impact device is converted to reciprocation of a body, preferably having a resilient coupler, which drives a ram into impacting in an improved rotary-to-reciprocative motion converter including a crankshaft operatively interconnected to reciprocate the body. The converter includes a crankpin bearing, a flat bearing surface secured normal to the reciprocation on a connecting rod or directly on the body, and a constraint spring to hold the flat bearing surface in contact with the bearing during operation. The improved converter provides reciprocation free of angular motion of connecting rods and irregular motion within clearances between moving elements to significantly reduce extraneous harmonic vibrations and energy losses therefrom.
    Type: Grant
    Filed: October 27, 1978
    Date of Patent: August 31, 1982
    Inventor: Frederick W. Ross
  • Patent number: 4149384
    Abstract: A fluid pressure amplifier for intensifying fluid pressure, the amplifier comprising a housing including a hydraulic fluid reservoir therein. A first chamber includes a slave piston mounted for reciprocation therein and for abutting engagement with a workpiece. A hydraulic fluid path extends intermediate the reservoir and the first chamber and a second chamber lies in the path intermediate the first chamber and the reservoir and includes check means intermediate the first and second chambers. A third chamber includes a fluid intensifier piston having a head end and a tail end, the head end being mounted for reciprocation in the third chamber and the tail end being mounted for reciprocation in the second chamber, the head end of the piston having a larger diameter than the tail end. Gas admittance means admit a pressurized gas to a gas path which lies intermediate the gas admittance means and the reservoir.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: April 17, 1979
    Inventor: Don J. Marshall
  • Patent number: 4049078
    Abstract: An apparatus for generating a series of seismic acoustic pulses in a body of water. The series is characterized by having continuously-variable, non-repetitive time intervals between successive pulses during a continuous seismic recording. The preferred generator is an air gun comprising a variable-speed motor with a rotating cam for actuating a sleeve valve which alternately opens and closes exhaust ports in a high-pressure chamber. As the valve repeatedly opens, jets of high-pressure air are impulsively expelled into the surrounding water, thereby generating an underwater acoustic pulse train.
    Type: Grant
    Filed: January 8, 1976
    Date of Patent: September 20, 1977
    Assignee: Western Geophysical Co. of America
    Inventors: John Lloyd Paitson, Clifford E. Anderson
  • Patent number: 4047849
    Abstract: A pneumatic pump adapted primarily as a left ventricular heart assist device includes a flexible bladder with a rigid housing. A pneumatic driver applies rhymical pulses between the bladder and the housing to repetitively collapse the bladder and establish a pumping action through the bladder, in conjunction with check valves in the inlet and outlet to the bladder. Between the driver and the pump there is provided a pneumatic pulse limiter which includes a flexible diaphragm isolating the driver from the pump. Pulses from the driver are transmitted to the pump only through the flexible diaphragm and the diaphragm is constrained to move only within established limits. Regardless of the magnitude of the pulse from the driver, the maximum pulse applied to the pump cannot exceed that corresponding to the maximum displacement of the diaphragm.Between successive pulses, the portion of the system between the driver and the flexible diaphragm is depressurized.
    Type: Grant
    Filed: January 9, 1976
    Date of Patent: September 13, 1977
    Assignee: Thermo Electron Corporation
    Inventor: Warren C. Clay
  • Patent number: 3948051
    Abstract: A fluid pressure amplifier for intensifying fluid pressure, the amplifier comprising a housing including a gas-hydraulic interface piston; a first chamber includes a slave piston mounted for reciprocation therein and for abutting engagement with a work piece. A hydraulic fluid path extends intermediate the interface piston and the first chamber so as to apply hydraulic pressure thereto. A second chamber is disposed in the path intermediate the first chamber and the interface piston and includes a check valve in the path intermediate the second chamber and the first chamber. A third chamber, includes a fluid intensifier piston having a head end and a tail end, the head end being mounted for reciprocation in the third chamber and the tail end being mounted for reciprocation in the second chamber. The head end of the intensifier piston has a larger diameter than the tail end and is exposed to gas pressure while the tail end is exposed, in the second chamber, to hydraulic pressure.
    Type: Grant
    Filed: August 1, 1974
    Date of Patent: April 6, 1976
    Inventor: Don J. Marshall