Joints and connections – Interfitted members – Rigid angle
Reexamination Certificate
1997-09-30
2001-12-18
Browne, Lynne H. (Department: 3629)
Joints and connections
Interfitted members
Rigid angle
C403S403000, C403S367000, C411S085000
Reexamination Certificate
active
06331092
ABSTRACT:
FIELD OF THE INVENTION
The present invention refers to a corner joint for profile sections provided with one or more longitudinal channels, in connection with the outside of the profile section via a likewise longitudinal slot opening and which channel constitutes a n attachment for a nut means which cooperates via screw means with connector fittings, wherein each screw means is provided with a lock means which is located in the slot opening between the nut means and the connector fittings, which lock means is provided with a screw opening and means for locking the nut means against rotation out of a locking position.
BACKGROUND OF THE INVENTION
Profile section beams may for example produced by extruding aluminum, with one or more longitudinal channels, in connection with the outside via a likewise longitudinal slot opening. These channels may be used for joining two or more sections by means of screw joints and connector fittings, e.g. for building a stand frame.
It is known to use a type of screw joints with a nut means which is entered into the channel via the section end to act as an attachment for a screw which extends via the slot into the channel. With these joint systems it is difficult to make modifications of an existing frame, e.g. for attaching new sections in the direction upwards or to the side, because new nut means must be entered at the section end.
It is also known to use scew joints with a nut means which is s o designed that it in one position of rotation may be entered from the outside through the slot into the channel, after which it in another position of rotation, via protruding shoulders, form a locking inside the channel. Thus, these screw joints make it possible to enlarge an existing stand rapidly and efficiently, e.g. from the middle of a section.
One drawback with these known screw joints is that the nut means may be displaced, by vibrations or other unintentional influence from its locking position, wherein the screw joint may loosen. This may lead to damages to people and/or to machines.
THE TECHNICAL PROBLEM
One purpose of the present invention is therefore to provide a screw joint, by which the nut means can not unintentionally be displaced from its position of locking.
THE SOLUTION
This object is accomplished according to the invention because the lock means is provided with at least one boss which during rotation of the nut means from its locking position cooperates with a shoulder on said nut means, in order to position the nut means and facilitate its removal from the channel.
REFERENCES:
patent: 4666355 (1987-05-01), Stover
patent: 4895484 (1990-01-01), Wilcox
patent: 5054978 (1991-10-01), Kowalski
patent: 5116161 (1992-05-01), Faisst
patent: 2468784 (1981-05-01), None
Browne Lynne H.
Cottingham John R.
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