Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Reexamination Certificate
2008-09-10
2009-12-08
Marcelo, Emmanuel M (Department: 3654)
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
C254S416000
Reexamination Certificate
active
07628384
ABSTRACT:
The present invention provides a ratchet block with a block body10having a pair of side cheeks11,12and a sheave assembly15therebetween, which comprises a hub16supporting an annular sheave17for rotation about a principal axis. The ratchet block also includes a ratchet mechanism comprising ratchet teeth19on the sheave and a pawl20mounted on the hub16or a side cheek11,12for movement between an engaged setting, where the ratchet mechanism is active, and a free setting where the ratchet mechanism allows free rotation of the sheave. An actuator25is also mounted on the hub16or said side cheek11,12and linked to the pawl20to effect movement thereof between its engaged and free settings. Means are provided for pivoting the hub between loaded and unloaded limiting positions about an axis parallel to but spaced from the hub's principal axis. Spring means33are provided for biasing the hub16to said unloaded limiting position. There are also included means38for interconnecting the actuator25and the other of the hub16and said side cheeks11,12.Pivoting movement of the hub from its unloaded position against the action of the spring means33under an applied load on the sheave17causes the actuator to effect movement of the pawl20to its engaged setting.
REFERENCES:
patent: 328340 (1885-10-01), Robbins
patent: 2349084 (1944-05-01), Findley
patent: 2356147 (1944-08-01), Caldwell
patent: 7431269 (2008-10-01), Carlson et al.
patent: 2287688 (1995-09-01), None
Allen Brothers (Fittings) Limited
Marcelo Emmanuel M
Renner Kenner Greive Bobak Taylor & Weber
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