Dual spool positive drive retractor

Details Dual spool positive drive retractor Dual spool positive drive retractor

1978-04-17

1979-08-14

Hornsby, Harvey C.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

280806, A62B 3502, B65H 7548

Patent

active

041643364

ABSTRACT:
A dual spool side by side retractor structure on a common frame wherein both spools are acted upon by a common lock pawl element, the lock pawl element engaging the ratchet teeth of one of the two spools and then being positively and guidably driven by the first spool to powered engagement with the other of said two spools and the guiding occurring as a consequence of cam surfaces directing the pawl-to-ratchet engagement. The pawl lock element is activated by a sensor element such as a pendulum structure. The pawl lock element is located between and beneath the two spools and upon tilting, the lock pawl element pivots toward guided interference with one set of ratchet teeth whereupon the moving spool drives the pawl element up a cam ramp to lockably engage the second spool. The pawl element is first displaced by an actuating sensor element and then the pawl element is displaced and driven laterally by the first spool in a direction transverse to the first displacement and up a ramp into contact with the retractor teeth of the second spool. The withdrawal and retraction directions of both spools are in an opposite sense to each other and the retractor spools are locked against any further withdrawal action when engaged by the pawl element. A spring in association with the cam-ramp restores the pawl element as retraction movement frees the pawl element.

REFERENCES:
patent: 3838831 (1974-10-01), Bell
patent: 4050717 (1977-09-01), Yamada et al.
patent: 4065070 (1977-12-01), Pilarski et al.

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