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US 5,729,952 AGranted
Mechanical rebar couplers
OwnerKjell L. Dahlinventor
Life of this patent
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OwnerKjell L. Dahlinventor
Estimating the term…
Methods and apparatus for making and assembling reliable mechanical rebar couplers so that a short upstand of rebar that protrudes from an existing concrete structure can be connected to a new rebar at a retrofit work site out in the field so as to provide a connection between a new and the existing structure. According to a first embodiment, one end of the protruding upstand is upset, and a threaded male coupling member surrounds the protruding upstand behind the upset end thereof. The threaded male coupling member is mated to a threaded female coupling member that is affixed to the new rebar such that the upset end of the upstand is retained between the male and female coupling members. According to a second embodiment, one end of each of the protruding upstand and the new rebar is upset, and a threaded male coupling member surrounds the protruding upstand and the new rebar behind the respective upset ends thereof. The threaded male coupling members are then mated to opposite threaded ends of a hollow cylindrical female coupling member so that the upset ends of the protruding upstand and the new rebar are retained at the interior of the female coupling member.
A mechanical rebar coupler for joining a first rebar to second rebar, said coupler comprising:
A method for coupling a first rebar to a second rebar, said method comprising the steps of:
The method recited in clalm 6, including the additional step of injecting grout between said relatively wide head formed on said first end of said first rebar and said female coupling cylinder attached to said second rebar in order to absorb compressive loads applied to said first and second rebars.
A method for coupling a first rebar to a second rebar, said method comprising the steps of:
Dependencies are inferred from the claim text.