Patent ID: 7153072

Claim:
A clamping device for key duplicating machine with dual pivoted joint comprising a substrate having a pair of left and right symmetrical cross grooves formed on front side thereof, for securing a pair of left and right vises; a horizontal pivoted joint provided on back upper edge of said substrate, for pivotally engaging an engagement base, in order to form a first pivoted joint, to enable said pair of left and right vises being pivotally rotated to a suitable angular position, for effecting a duplication of one type of key; a horizontal pivotal connecting hole formed on upper edge of said engagement base, for pivotally engaging with a horizontal pivoted joint arranged on body of said duplicating machine, and for forming a second pivoted joint, in order to enable said pair of left and right vises being pivotally rotated to a suitable angular position, and to effect a duplication of another type of key; wherein said pairs of left and right vises each comprises a screw horizontally secured to center portion of said cross groove, and a fixed jaw having a back rectangular protrusion for engagement with said cross groove, and a longitudinal rectangular protrusion for engagement with a rectangular groove formed at back center portion of a movable jaw, a central hole and two side holes formed in parallel in an integral portion between said longitudinal rectangular protrusion and said back rectangular protrusion of said fixed jaw, and aligned one another, said central hole is used for receiving a compression spring, in order to enable the latter to bias against said movable jaw, and for passing said screw therethrough, said two side holes are used for respectively receiving a guide post, in order to enable said movable jaw being moved straight towards said fixed jaw in accordance with said guide post, for clamping a key; and wherein said fixed jaw and said movable jaw are respectively formed with two pairs of upper and lower protrusive clamping feet at upper and lower ends thereof, said two pairs of upper and lower protrusive clamping feet are respectively formed with a pair of upper and lower clamping half parts, in order to form an upper clamping part for one type of key, and to form a lower clamping part for another type of key, when said movable jaw is moved towards said fixed jaw.