Patent ID: 7942394

Claim:
A pin locking apparatus, comprising: a housing having at least one pin bore, the at least one pin bore having an inner end and an outer end, at least one pin opening fluidly connected to the outer end of the at least one pin bore and having a smaller size than the at least one pin bore, at least one pin adjustment channel fluidly connected to the inner end of the at least one pin bore, at least one locking bore, and at least one pin locking channel fluidly connected to the at least one locking bore; at least one pin comprising a piston and a shaft, the piston being slideably contained within the at least one pin bore and the shaft being slideably received in the respective pin opening to be extendable from the pin opening by application of a pneumatic pressure in the at least one pin adjustment channel; and at least one locking piston slidably contained within the at least one locking bore and actuated by a pneumatic pressure in the at least one locking bore to apply a locking force on the at least one pin.