Patent ID: 8919617

Claim:
A dispensing tool that operates in combination with a replaceable, insertable cartridge of predetermined dimensions, having dispensable contents therein, with a follower that is a part of the cartridge, to dispense the dispensable contents of the cartridge by operation of a grip-type actuator of the tool that advances a pressure plate against the follower, thereby advancing the follower toward an exit port of the cartridge to produce a metered discharge of the dispensable contents there through, the dispensing tool comprising: a holder having proximal and distal ends and sized to receive the cartridge of said predetermined dimensions and to retain the cartridge against advancement of said pressure plate toward said distal end and against the follower; and a pantograph mechanism located intermediate said pressure plate and said grip-type actuator, wherein the grip-type actuator provides a selectively actuated trigger that operates a pantograph extending mechanism to cause said pantograph to advance the pressure plate toward said distal end of said holder; wherein: said pressure plate is a disk of circular periphery; said pantograph mechanism is formed of at least two pantograph structures arranged in parallel such that said at least two pantograph structures are simultaneously moveable between compacted and extended configurations; said parallel pantograph structures are interconnected by spacers of preselected length, establishing a lateral spacing between the parallel pantograph structures, wherein the lateral spacing establishes a width of the parallel pantograph structures approximately equal to a side element of a square having corners of said square on the circle encompassing the periphery of the pressure plate; and when in compacted configuration, the pantograph structures have a height approximately equal to a side element of a square having corners of said square on the circle encompassing the periphery of the pressure plate.