Spring operated accelerator and constant force spring mechanism

Details Spring operated accelerator and constant force spring mechanism Spring operated accelerator and constant force spring mechanism

1975-10-24

1977-02-15

Gill, James J.

Measuring and testing

Testing by impact or shock

Specimen impactor detail

73432SD, 73 716, G01N 332

Patent

active

040076237

ABSTRACT:
A spring assembly consisting of an elongate piece of flat spring material formed into a spiral configuraton and a free running spool in circumscribing relation to which this spring is disposed. The spring has a distal end that is externally accessible so that when the distal end is drawn along a path, the spring unwinds against a restoring force present in the portion of the spring that resides in a transition region between a relatively straight condition on the path and a fully wound condition on the spool. When the distal end is released, the distal end is accelerated toward the spool by the force existing at the transition region which force is proportional to the cross-sectional area of the spring.
An accelerator having a carriage for a test load and a pair of the above mentioned spring assemblies installed to bias the carriage toward the center of a linear path on which the carriage is constrained to move. To cause the carriage to oscillate in a pattern of constant accelerations, the carriage is displaced to a position toward one end of the path and released, whereupon the springs cause the carriage and the load attached thereto to be accelerated in reciprocation on the path.

REFERENCES:
patent: 2380159 (1945-07-01), Eksergian

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