Patent ID: 6684471
Filing Date: 2004-02-03
Classification: B25B,Y10T

Abstract:
A tool apparatus for removing a hinge pin from the pin barrel enclosure housing of its hinge assembly comprising:a housing block assembly having as components a housing block subassembly with a front face, a rear face, substantially parallel side faces, a top face, a bottom face, and a central core cavity, said front face being grooved and adapted to receive the hinge pin barrel enclosure housing of a hinge assembly; a gear train subassembly adapted to fit inside and be positionally fixed within said central core cavity of said housing block; said gear train subassembly having a rack gear base bar member and a drive gear member with a central drive shaft; said rack gear base bar member having a bottom end and a top end; said bottom end facing said housing block bottom face surface and said top end facing said housing block top face surface; a connecting rod having a lower end and an upper end, said lower end being attached to the top end of said rack gear base bar member; a horizontally and vertically slidable pry head subassembly mechanism having a proximal adjustable screw tail end section and a distal horizontally and vertically slidable jaw face end section, said proximal screw tail end section being attached to said upper end of said connecting rod, and said distal jaw face end section being horizontally and vertically slidable, forward movable, and having a disc-beveled pry wedge shaped surface extending outwardly from said housing block subassembly and perpendicular to said rack gear base bar and said connecting rod; said top end surface of said rack gear base bar member being attached to and transmitting a vertical upward force along and through said connecting rod upper end to the proximal tail end section of said pry head subsassembly mechanism, said horizontally and vertically slidable, forward moveable, jaw face end section having a disc-beveled pry wedge shaped surface adapted to wedge engage the narrow space gap intersection between the undershoulder surface of a hinge pin and the hinge pin enclosure barrel top surface of a hinge assembly; said jaw face end section being movable and being driven forward horizontally by said tail screw end member engaging the rear surface of said jaw face end section, so that the rotational turning of the tail screw of said tail screw end section urges and wedges the disc-beveled pry wedge surface into said narrow space gap intersection formed by the hinge pin front undershoulder and the hinge barrel enclosure horizontal upper surface, to cause said housing block and said disc-beveled wedge surface to engage and penetrate said narrow space gap intersection; a retaining positioning ring extending outward from and connected to one of said housing block surface, said retaining positional ring adapted to engage the back undershoulder surface of said hinge pin head, and act in combination with said housing block front face groove surface being held against the hinge pin barrel enclosure, to maintain integrated contact with said jaw face end section surface; and a driving force means applied to said gear train drive shaft to cause said drive gear to rotate and force said rack gear to move vertically upward with respect to the drive gear teeth, so as to urge said pry head subassembly mechanism upward and transmit a large mechanical force advantage to said beveled-disc pry wedge surface engaging said narrow gap intersection between said hinge pin head front undershoulder and said hinge barrel enclosure top surface, and thereby exert a strong, leveraged upward, vertical wedge pry force to extract the hinge pin from the hinge pin barrel enclosure of the hinge assembly.