Patents Assigned to Joh. Friedrich Behrens AG
  • Patent number: 5782395
    Abstract: The invention relates to a driving tool for fastener elements, wherein a tool casing includes a valve cavity of a main valve closed by a casing cover, a valve piston being sealingly and slidingly mounted coaxially within the valve cavity about a work cylinder, the valve piston when in a lower position sealingly engaging upon an upper edge of the work cylinder so as to close an inlet passage communicating with a pressure air source and opening into an upper work space of the work cylinder, and the valve piston when in an upper position closing an outlet passage, which communicates with the work space via a throughbore of the valve piston, by sealingly engaging a valve seat element, the valve piston having a lower work surface which is continuously subjected to pressure of the pressure air source, and an upper work surface adapted to be selectively subjected to atmospheric pressure or pressure of the pressure air source by a control valve, the improvement of which is characterized by the valve piston having axi
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: July 21, 1998
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Marcus Sauer
  • Patent number: 5715986
    Abstract: The invention relates to a driving tool for fastener elements, comprising a casing (1), a working cylinder (3) located in the said casing, and a main valve coaxially mounted atop the said working cylinder, the said main valve comprising a valve chamber (22) located in the said casing (1) and closed by a cap (24), the said main valve further comprising a valve piston (25) which is sealingly and slidably guided in the said valve chamber (22), wherein the valve piston has a lower position in which an inlet passage connected to a source of compressed air is closed with respect to the upper working chamber of the said working cylinder and which valve piston has an upper position in which an outlet passage (43,47,48) which is connected to the working chamber via a throughbore (29,30) of the valve piston is closed by sealingly engaging a valve seat element (34), wherein the valve piston further includes a lower surface area which is continuously subjected to the pressure of the source of compressed air and a further
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: February 10, 1998
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Marcus Sauer
  • Patent number: 5511714
    Abstract: The present invention relates to a sealing device for the driver member of a pneumatically operated driving tool for fasteners. It comprises a working cylinder, a working piston slidably arranged in said working cylinder for movement between an upper and a lower dead center, a resilient stop member defining the lower dead center of the working piston movement, a driving member secured to said working piston and extending through an opening of said stop member, a control valve actuated by a trigger to alternatively connect a cylinder space above said working piston with a source of compressed air and to atmosphere, and a piston return space in communication with a cylinder space below said working piston.
    Type: Grant
    Filed: November 16, 1993
    Date of Patent: April 30, 1996
    Assignee: Joh. Friedrich Behrens AG
    Inventors: Joachim Bauer, Klaus Albrecht, Rolf Krahmer
  • Patent number: 4915013
    Abstract: Control valve means for a driving tool operated with compressed air for the driving of fasteners into workpieces. Through a specific design of the main and the auxiliary valve and through a connection to the piston return chamber the control of the valves are brought into synchronization with the movement of the working piston. By this, high repetition frequencies can be achieved. Further, in the mode "automatic operation" also single shot operation is possible.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: April 10, 1990
    Assignee: Joh. Friedrich Behrens AG
    Inventors: Roland Moraht, Manfred Bahnke
  • Patent number: 4856696
    Abstract: Pneumatically operated driving tool for fasteners comprising a working cylinder, a working piston within the working cylinder connected to a driver of the like, a stop in the working cylinder limiting the working stroke of the working piston, a control valve adapted to be actuated by a trigger, a working space above the working piston when the piston is in its upper dead point position, the control valve being adapted to alternatingly connecting the working space with a pressurized air source or with atmosphere, respectively, a piston return chamber surrounding the working cylinder and connected thereto by a first opening adjacent the stop, and a second opening spaced from the stop, the working piston having a smaller diameter than the working cylinder. An annular piston is sealingly displaceably located on the driver and sealingly engages the wall of the working cylinder.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: August 15, 1989
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Sigurd V. Seld
  • Patent number: 4749115
    Abstract: A magazine for a power-driven drive-in apparatus for the accommodation of pins or nails, especially headless nails or pins, comprising a guiding channel the roof wall of which is adapted to assume different heights vis-a-vis the bottom wall for adaptation to the lengths of the pins or nails. A side wall of the guiding channel is formed by at least one longitudinal surface of a lamination which is supported in the upper region of the guiding channel to be capable of limited movement along an axis transverse to the longitudinal axis of the guiding channel and is biased by a spring in a direction towards the other side wall.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: June 7, 1988
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Hellmuth Fehrs
  • Patent number: 4667572
    Abstract: A valve arrangement for a compressed-air operated nailing apparatus with valve pistons operating without intersection in such a manner that the one valve piston cooperates with the working cylinder and is guided by the other working piston which is controlled by an auxiliary control valve, wherein the first auxiliary piston is also controlled at the same time, and wherein upon opening the valve arrangement the second valve piston is moved first into the opening position and the first valve pistion thereafter.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: May 26, 1987
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Wolfgang Elliesen
  • Patent number: 4609135
    Abstract: The present invention relates to a sound-dampened driving apparatus for fasteners wherein a main valve means is arranged above a working cylinder of the apparatus and movable within a cylindrical bore. When the main valve means is in its lower at rest position, the main valve means separates the working cylinder from a source of compressed air and connects the cylinder to the atmosphere. When the main valve means is in its upper actuating position, the working cylinder is connected to the source of compressed air and the valve means blocks the cylinder connection to the atmosphere. The space above the main valve member within the cylindrical bore is capable of being alternately connected to either the atmosphere or compressed air, and includes a sound dampening means arranged in the space above the main valve member.
    Type: Grant
    Filed: October 22, 1984
    Date of Patent: September 2, 1986
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Wolfgang Elliesen
  • Patent number: 4509669
    Abstract: The present invention relates to a sound-dampened driving apparatus for fasteners wherein a main valve member is arranged above a working cylinder of the apparatus and movable within a cylindrical bore. When the main valve member is in its lower at rest position, the main valve member separates the working cylinder from a source of compressed air and connects the cylinder to the atmosphere. When the main valve member is in its upper actuating position, the working cylinder is connected to the source of compressed air and the valve member blocks the cylinder connection to the atmosphere. The space above the main valve member within the cylindrical bore is capable of being alternately connected to either the atmosphere or compressed air, and includes a sound dampening means arranged in the space above the main valve member.
    Type: Grant
    Filed: May 19, 1982
    Date of Patent: April 9, 1985
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Wolfgang Elliesen
  • Patent number: 4432483
    Abstract: The present invention relates to a safety release mechanism for use with a power operated driving apparatus for fasteners which includes a pivotally supported trigger or release lever housing for actuating or releasing the driving apparatus upon engagement with a release pin or switch. The safety release mechanism is supported in the trigger housing between the trigger and the release pin and is biased by a spring to the safety or off position which prevents the trigger lever from engaging the release pin. Upon movement of the safety release member to the actuated or release position, the trigger lever is engageable with the release pin or switch to actuate the power operated driving apparatus.
    Type: Grant
    Filed: March 12, 1982
    Date of Patent: February 21, 1984
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Manfred Kuck
  • Patent number: 4351464
    Abstract: The invention relates to a compressed air-operated fastener driving tool comprising a pilot valve controlled by a manually actuated release lever, a control valve, the pressure bias of which is controlled by the pilot valve and which for its part controls the supply of compressed air to a working cylinder, and a release barrier adapted to be actuated by the workpiece by means of which the actuation of the pilot valve is adapted to be controlled in common with the release lever when placed in its working position.
    Type: Grant
    Filed: June 3, 1980
    Date of Patent: September 28, 1982
    Assignee: Joh.Friedrich Behrens AG
    Inventors: Hellmuth Fehrs, Wolfgang Elliesen
  • Patent number: D365974
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: January 9, 1996
    Assignee: Joh. Friedrich Behrens AG
    Inventor: Walter Matuschek