초록 ▼

An electric powered multiple impact fastener driving tool comprising a handle portion, a main body portion, a guide block, a magazine, and a guide and biasing assembly mounted in the guide block and affixed to the magazine enabling shifting of the magazine within the guide block between an extended

An electric powered multiple impact fastener driving tool comprising a handle portion, a main body portion, a guide block, a magazine, and a guide and biasing assembly mounted in the guide block and affixed to the magazine enabling shifting of the magazine within the guide block between an extended fastener starting position and a retracted fastener driven position. The main body portion contains an impact assembly comprising a motor driven cam wheel with a single drop-off, a cam follower roller mounted on a reciprocable hammer, a compression spring surmounting and abutting the hammer, and a fastener driver. For each rotation of the cam wheel, the cam follower roll lifts the hammer, compressing the spring and storing energy therein. At the cam wheel drop-off, the cam follower wheel and hammer drop under the influence of the spring and the hammer impacts the driver which imparts a blow to the fastener. The cam follower wheel does not contact the cam wheel immediately after drop-off. Further cam wheel rotation will result in contact, greatly reducing wear of the parts. This sequence is repeated until the fastener is driven and the tool thereafter shuts off to conserve energy. At least one switch and cooperating actuator are provided to vary the number of blows per driving cycle and to control the depth of drive.

대표청구항 ▼

[ What is claimed is:] [1.] An multiple impact fastener driving tool, said tool comprising a handle portion, a main body portion containing an impact assembly, a magazine having a forward end, a guide body containing a drive track at said forward end of said magazine, a guide block affixed to said h

[ What is claimed is:] [1.] An multiple impact fastener driving tool, said tool comprising a handle portion, a main body portion containing an impact assembly, a magazine having a forward end, a guide body containing a drive track at said forward end of said magazine, a guide block affixed to said handle portion and said main body portion, said magazine being shiftable with respect to said guide block between an extended fastener starting position and a retracted fastener driven position, said impact assembly comprising a motor, a cam wheel having a peripheral cam surface with at least one drop-off being rotatable by said motor, a reciprocable hammer, a cam follower roller rotatively mounted on said hammer, said hammer having a first end comprising an impact surface and a second end, a compression spring surmounting and abutting said second end, a fastener driver assembly, a part of said driver assembly being slidable in said drive track, stop members limiting the axial movement of said driver assembly, said hammer being shiftable axially by said cam wheel and cam follower roller away from said driver assembly, said compression spring being compressible by said hammer such that energy is stored therein, said cam follower roller and said hammer being releasable by said cam wheel drop-off, said hammer being shiftable by said stored energy of said compression spring to impart a sharp blow to said driver assembly and thus to a fastener being driven, said hammer, said cam wheel and said cam follower roller being configured to cause the hammer to apply a rapid succession of such blows to said driver assembly until said fastener is fully driven by said driver assembly and said motor is turned off.