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US 4,715,474 AGranted
Scaffold system
OwnerDonald T. Wehmeyerinventor
Life of this patent
Estimating the term…
Abstract
A portable scaffold having tubular structural elements has necked fittings extending into the ends of the tubular elements and attached thereto by adhesive which is introduced through an entry port preferably provided by a porting ring sleeved on the neck of each fitting and opposed by an O-ring. The adhesive flows from the entry port through longitudinal and circumferential grooves in the neck between the porting ring and O-ring and vents through a vent port in the porting ring.
Claims30
An end fitting for a tubular member, comprising:
- a one-piece body having a head and a neck projecting to an outer end from said head, circumferential portion of reduced circumference;
- a porting ring sleeved on said neck and adjoining said head, said porting ring having exposed inlet and vent ports;
- inlet and vent passages connecting said inlet and vent ports with the exterior of said central portion;
- said body being adapted to have a tubular member sleeved on said neck into engagement with the porting ring whereupon adhesive may be introduced through the inlet port for filling the space between said central portion and the tubular member for securing the tubular member to said neck.
1 more element
A ladder section for use in a scaffold having a pair of ladder sections interconnected by braces, comprising:
- a parallel spaced pair of continuous plastic tubular posts;
- a plurality of tubular rungs between said posts;
- plastic T-fittings mounted in the ends of said rungs and sleeved on a respective one of said posts, said T-fittings having respective grooved areas surrounding said posts and surrounded by the rungs;
- inlet passages to the grooved areas and vent passages from such grooved areas;
- and adhesive substantially filling said inlet passages and grooved areas for connecting the T-fittings to the rails and rungs.
2 more elements
An end fitting for a tubular member, comprising:
- a one-piece body having a head and a round neck formed with a first circumferential groove adjoining the head for receiving a porting ring, a first circumferential land adjoining said first circumferential groove, a second circumferential land having substantially the same diameter as the first circumferential land and separated therefrom by a central circumferential area of lesser diameter for receiving adhesive, and longitudinal grooves extending across the first circumferential groove and the first circumferential land into the central circumferential area for communicating with the porting ring.
An end fitting for a tubular member, comprising:
- a one-piece body having a neck projecting from an annular shoulder which is interrupted by a pair of recesses, said neck having a circumferential groove adjoining said shoulder and recess;
- a porting ring sleeved on the neck in said circumferential groove and engaging said shoulder, said ring having a pair of ear extensions within said recesses which have inlet and vent ports therein;
- and
- said porting ring having an annular portion which is substantially flush with two circumferential lands on said neck whereby a tubular member can closely fit over said lands and said annular portion of the porting ring, said porting ring being formed from a flexible plastic material so that it can be press-fitted onto said neck and pass over said lands.
1 more element
An end fitting for two tubular members arranged at right angles to one another, comprising:
- a one-piece body having two necks projecting therefrom at right angles to one another from respective annular shoulders, each of which is interrupted by a pair of recesses, each neck having a circumferential groove adjoining the respective shoulder and recess;
- a respective porting ring sleeved on each neck in its circumferential groove and engaging the respective shoulder, said rings having respective pairs of ear extensions within said pairs of recesses which have inlet and vent ports therein;
- and
- each porting ring having an annular portion which is substantially flush with two circumferential lands on the respective neck whereby a tubular member can closely fit over said lands and said annular portion of the porting ring, said sealing ring being formed from a flexible plastic material so that it can be press-fitted onto said neck and pass over said lands.
1 more element
A ladder section for use in a scaffold having a pair of ladder sections interconnected by braces, comprising:
- a parallel spaced pair of continuous posts with a cylindrical exterior surface;
- a plurality of tubular rungs between said posts;
- plastic T-fittings mounted in the ends of said rungs and sleeved on a respective one of said posts, said T-fittings having respective grooved areas surrounding the cylindrical exterior surface of said posts and surrounded by the rungs;
- inlet passages in the T-fittings for feeding adhesive to the grooved areas;
- vent passages in the T-fittings for venting from such grooved areas;
- and
- adhesive filling said grooved areas for connecting the T-fittings to the rails and rungs.
4 more elements
A T-fitting comprising:
- a molded plastic body of general T-shape having a longitudinal bore for receiving a cylindrical post therethrough, and having a neck extending at a cross-angle relative to the axis of said bore for receiving a tubular member thereon;
- circular grooved areas in said body interrupting said bore and the exterior surface of said neck;
- inlet passages in said body arranged to feed adhesive to said grooved areas for connecting the T-fitting to such a post and tubular member;
- and
- vent passages in the T-fitting arranged to vent said grooved areas while they are being filled with adhesive.
2 more elements
Dependencies are inferred from the claim text.