Reversible ratchet mechanism

A ratchet mechanism comprising:

• a handle including a cavity and a slit formed therein and communicating with each other,
• a block secured in said cavity of said handle and including a rib for engaging with said slit so as to prevent said block from rotating relative to said handle, said block including a bore formed therein and including two channels communicating with said bore, said block including a slot and a groove formed therein and including two projections extended inward of said slot so as to define three positions,
• a rod including a first end rotatably engaged in said bore of said block,
• a sleeve engaged in said bore of said block and secured on said rod so as to be rotated in concert with said rod, said sleeve including a gear formed thereon,
• two pawls engaged in said channels,
• spring means engaged in said channels for biasing said pawls to engage with said gear,
• a disc engaged with said block and including an extension extended inward of said bore for engaging with said pawls and for disengaging said pawls from said gear, said disc including two holes formed therein,
• an arm including two legs engaged in said slot and said groove respectively, a first of said legs being engaged with said projections so as to be engaged in at least one of said three positions,
• a control ferrule rotatably engaged on said rod and secured to said disc so as to be rotated in concert with said control ferrule, and
• means for securing said control ferrule to said rod and said handle,
• said extension of said disc being rotated by said control ferrule in order to disengage at least one of said pawls from said gear so as to control an acting direction of said rod, and both of said pawls being engaged with said gear when said extension is engaged between said pawls.