Patents Assigned to Alimak AB
  • Hose rupture valve
    Patent number: 3974852
    Abstract: The valve is adapted to close against the force of a bias spring in response to a substantial increase in the pressure drop through restricted by-pass passages in the valve when a hose is ruptured on the outlet side of the valve. The restriction of the by-pass passages is adjustable by rotation of an internal adjustment ring to thereby determine the flow rate at which the valve is actuated.
    Type: Grant
    Filed: November 27, 1974
    Date of Patent: August 17, 1976
    Assignee: Linden-Alimak AB
    Inventor: Torbjorn Svensson
  • Pipe for sticking down drains into the ground
    Patent number: 3961486
    Abstract: A tube for sticking stripformed drains into the ground has a predetermined fixed profile of rhombic cross section made by pressing two opposite corners of a square tube towards each other.
    Type: Grant
    Filed: October 22, 1974
    Date of Patent: June 8, 1976
    Assignee: Linden-Alimak AB
    Inventors: Sven Granholm, Signar Lundmark
  • Construction hoist conveying system
    Patent number: 3952836
    Abstract: A composite transfer device for conveying material used in the construction of high tower-like structures, from a loading position at the base of the structure to a working platform which is raised as building proceeds. The device includes portions giving horizontal and vertical movement of a container, and includes a first transport unit at the loading level, a vertical hoist, and a second transport unit mounted on the working platform. The second transport unit includes a radial track movable around the working platform to deliver materials from the hoist, which is centrally situated, to different working areas around the structure. A special feature of the device is the use of a carrier frame which is square in plan view and which is supported on two hoist ropes attached to opposite corners of the frame, and which is also guided by guide tubes connected to the remaining two corners of the frame and which are located by downwards travelling reaches of the hoisting rope.
    Type: Grant
    Filed: September 27, 1973
    Date of Patent: April 27, 1976
    Assignee: Linden-Alimak AB
    Inventor: Jozsef Thoma
  • Control arrangement, preferably for remote controlled, hydrostatically operated hoist machineries
    Patent number: 3943716
    Abstract: The cable drum for the hoist cable of a hoisting device is driven by a hydraulic motor with a constant displacement that in its turn obtains drive fluid from a pump with a variable displacement. The displacement of the pump, and with that the speed and rotational direction of the cable drum, is operated by means of the rod of a piston in a double acting hydraulic cylinder, the piston being displaceable in the cylinder by means of pressure fluid, which pressure and direction of flow is adjustable by means of valves, which in their turn are operated electrically from a control lever.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: March 16, 1976
    Assignee: Linden Alimak AB
    Inventor: Rune Andersson