Fire escape – ladder – or scaffold – Pole or strand grasping-type climber – Alternate grasping
Patent
1992-12-15
1994-05-03
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Pole or strand grasping-type climber
Alternate grasping
182178, 182 82, 248246, E04G 120
Patent
active
053078993
ABSTRACT:
A pump jack scaffold includes a pair of extruded aluminum poles. Each pole has a rectangular cross-section. Wood is adhered to one side wall of each pole, providing a surface a jack mechanism can grip. Each of the other three side walls is extruded with a longitudinal structure, internal to the pole, which defines a lengthwise T-slot opening into the exterior of the associated sidewall. Bolts are insert into the T-slots to fasten braces, which can be used either to engage an adjacent building structure, to join the uprights to define a more unitary structure, or to render the scaffold self-supporting. Each pole is separable into upper and lower sections for transportation. The sections are joined by a resilient internal bridging member which is extruded of aluminum. It has an elongate central portion, webs extending radially from the central part, and a bracing portion terminating each web and engaging a corner of the pole. Upper and lower locking pins extend through aligned openings formed in the pole sections and the bridging member to secure the sections. The bracing portions are spaced to define longitudinal slots that closely receive the internal longitudinal structures extruded with the pole, reinforcing the pole against twisting.
REFERENCES:
patent: 3513606 (1970-05-01), Jones
patent: 3848844 (1974-11-01), Barrett
patent: 4382488 (1983-05-01), Anderson
patent: 4432435 (1984-02-01), Anderson
patent: 4481748 (1984-11-01), D'Alessio et al.
Chin-Shue Alvin C.
Waraksa Mirek A.
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