Patents Assigned to Parca-Norrahammar AB
  • Heating boiler
    Patent number: 4180018
    Abstract: A heating boiler with a combustion chamber between a front wall, a rear wall and a convection part in each one of the side walls, a flue system composed of parallel flues of substantially circular cross-section arranged vertically in different cross-section planes through the boiler with at least two flues in each side wall in one and the same cross sectional plane, forming upwards or downwards passages for flue gases.
    Type: Grant
    Filed: September 21, 1977
    Date of Patent: December 25, 1979
    Assignee: Parca Norrahammar AB
    Inventors: Bruno Larsson, Kurt Bohm, Janeric Strom, Borje Aslund
  • Adjustable manhole frame assembly
    Patent number: 4038789
    Abstract: An adjustable manhole frame assembly for underground conduits, catch basins, or the like, in which telescoped upper and lower frames include screw fasteners engaging in vertically-angulated slots for adjusting the frames axially and angularly to orient the top frame and its cover in relation to an upper surface such as the running surface of a street, or the like.
    Type: Grant
    Filed: March 18, 1975
    Date of Patent: August 2, 1977
    Assignee: Parca-Norrahammar AB
    Inventors: Gunnar Albert Axgarde, Bengt Borje Axelsson, Alf Klingwall
  • Connecting components for piles
    Patent number: 3953981
    Abstract: A concrete pile joint to be used for joining piles by means of complementary joint members, one of which is fastened to the end of a first pile and the other to the end of a second pile. Each joint member has male and female members constituted of rib portions and branches protruding on a support surface of each joint member. By assembling the joint the rib portions are received within the branches and lock pins inserted into coaxial through holes in both the rib portions and the branches for securing each pair of male and female member.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: May 4, 1976
    Assignee: Parca-Norrahammar AB
    Inventors: Bengt Axelsson, Gunnar Albert Axgarde