In a pump jack scaffold comprising a pair of uprights, a platform, a pair of jack mechanisms each secured to a different one of the uprights and supporting the platform;
- each of the uprights comprising an elongate extruded aluminum pole comprising a generally rectangular outer transverse cross-section, a pair of parallel side walls each having an outer surface, four corner portions, a hollow interior, and a longitudinal structure extruded with one of the pair of side walls and defining a longitudinal slot with a constricted mouth that opens into the outer surface of the one side wall and comprising friction material secured to the pole and covering the majority of the outer surface of the other of the pair of parallel side walls, the friction material being operatively engaged by the jack mechanism secured to the upright:
- the platform extending from one lateral side of the scaffold and the one of the pair of side walls of the pole of each upright faces to the one later side of the scaffold, the improvement in which the scaffold is adapted to be self-supporting on a generally horizontal surface on which the uprights are rested, each of the uprights being associated with a brace assembly that extends to the one lateral side, each of the brace assemblies comprising:
- a first elongate brace with an upper end portion and a lower end portion, the lower end portion being engaged with the generally horizontal supporting surface;
- a second elongate brace comprising a pair of opposing end portions;
- a pivot joint connecting one of the end portions of the second brace to the first brace intermediate the upper and lower end portions of the first brace for pivoting about a predetermined horizontal axis;
- first connection means for connecting the upper end portion of the first brace at a selectable vertical position to the upright associated with the brace assembly, the first connection means comprising a first fastener comprising an enlarged portion received in and shaped for displacement along the slot of the pole of the associated upright and comprising a portion extending outwardly through the constricted mouth of the slot of the pole of the associated upright, a first connector shaped to receive the outwardly-extending portion of the first fastener, a first complementary fastener cooperating with the outwardly-extending portion of the first fastener to releasably secure the first connector to the pole of the associated upright, and a first pivot joint connecting the upper end portion of the first brace to the first connector for pivoting about an axis substantially parallel to the predetermined horizontal axis;
- and,
- second connection means for connecting the other of the end portions of the second brace at a selectable vertical position to the upright associated with the brace assembly, the second connection means comprising a second fastener comprising an enlarged portion received in and shaped for displacement along the slot of the pole of the associated upright and comprising a portion extending outwardly through the constricted mouth of the slot of the pole of the associated upright, a second connector shaped to receive the outwardly-extending portion of the other fastener, a second complementary fastener cooperating with the outwardly-extending portion of the second fastener to releasably secure the second connector to the pole of the associated upright, and a second pivot joint connecting the other end portion of the second brace to the second connector for pivoting about an axis substantially parallel to the predetermined horizontal axis.