Manual device for driving screws

A manual device for driving screws or similar fasteners in walls and the like including a housing having a piston grip to facilitate handling of the device, means for producing a rotational motion for driving the screw, said housing having support means adapted to support an explodable power source, and a trigger on said housing and being operable to explode the power source to initiate the screw driving procedure, wherein:

• (a) a first longitudinally movable ram in said housing;
• (b) a rotary ram in said housing mounted for axial and rotational movement when acted upon by said first ram;
• (c) a screw holder on said rotary ram for holding the screw to be driven;
• (d) a power source in energy exchanging relationship with said first ram for exerting an axial force on said first ram to drive said first ram toward said rotary ram when said power source is exploded by said trigger;
• (e) and an intermediate ram between said first and rotary rams wherein to smooth and equalize the transmitted force, said first ram, as it is rebounding under the force of the explosion of said exploded power load, strikes said intermediate ram which, in turn, acts in an axial manner upon said rotary ram, and thread means between said housing and said rotary ram whereby said rotary ram is caused to move forward with coordinated, simultaneous axial and rotational motions and drives a screw which is at least indirectly arranged there against into an appropriate mating material.