B - Operations – Transporting – 21 – K
Patent
B - Operations, Transporting
21
K
26/159
B21K 21/08 (2006.01)
Patent
CA 1187681
ABSTRACT The invention relates to a new method of assembly of pneumatic counterbalance units and to apparatus for carrying out that method. Components of the unit are positioned within crimping die tools in a crimping press with a small quantity of lubricating oil pre-introduced into the cylinder component. The die parts holding the components are moved in a direction towards assembly. The die tool parts engage and provide a sealed compartment surrounding all components of the unit. At this stage the compartment is pressurized by gas at several atmospheres and, while pressurized, press movement continues. As the crimping die parts move together the piston assembly parts including the rod seal and the end bushing move into the cylinder and entrap a quantity of pressurized gas within the cylinder. As press action continues, the open end wall portion of the cylinder is crimped inwardly by the crimping die tool, thereby retaining the bushing, seal, rod and piston in the cylinder and completing the assembly. The sealed die compartment is vented, pressurization is released, the press is reversed and the tools move apart to permit removal of the assembled counterbalance unit. The crimping die tools are structured so as to maintain the counterbalance components in their pre-assembly positions and to provide a closed sealed cavity around the components while that compartment is being pressurized and depressurized.
443218
Avm Corporation
Macrae & Co.
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