Method of making a pressurized pneumatic counterbalance

Details Method of making a pressurized pneumatic counterbalance Method of making a pressurized pneumatic counterbalance

1982-09-15

1984-06-05

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Assembling or joining

29511, 29520, 53 88, 53101, 53403, B23P 1100

Patent

active

044519648

ABSTRACT:
A pneumatic spring counterbalance extensible link including a closed end cylinder with an end connector a piston and rod assembly within the cylinder and maintained therein by the crimped over end portion of the cylinder retaining a rod bushing and rod to cylinder seal. The cylinder is pressurized prior to assembly of the complete piston and rod into the cylinder. The piston assembly includes orifice by-pass means either in the piston periphery or in a piston ring, and the piston may include a fail-safe provision in the event the orifice is clogged. A crimping die assembly is used in assembling and completing final assembly of the counterbalance components while simultaneously maintaining the link in a pressurized environment, utilizing sealed arrangement between the crimping dies to maintain pressurization of the interior of the dies and the counterbalance components prior to assembly of the components. A dual force embodiment of the counterbalance unit is disclosed and utilizes a floating sealed piston below the main piston and rod assembly entrapping pre-charged gas in the space between the floating piston and the closed end of the cylinder.

REFERENCES:
patent: Re28329 (1974-10-01), Nicholls
patent: 2882592 (1959-06-01), De Carbon
patent: 3207498 (1965-09-01), Wustenhagen
patent: 3545170 (1970-12-01), Leonard
patent: 3868097 (1975-02-01), Taylor
patent: 3927871 (1975-12-01), de Baun
patent: 4079925 (1978-03-01), Salin
patent: 4123859 (1978-11-01), Koning
patent: 4194731 (1980-03-01), Marx
patent: 4221367 (1980-09-01), Smith
patent: 4310148 (1982-01-01), Freitag

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