Abstract A mallet drive stapling machine is shown which includes a housing, a magazine, a piston raceway and a drive channel within the housing. A follower is movable within the magazine to sequentially propel fasteners contained therewithin into operative relationship with the drive channel. A piston having an enlarged upper portion, an outwardly projecting intermediate portion, and a lower portion is movable within the piston raceway. A driver blade is secured to the lower portion of the piston and is selectively movable within the drive channel to drive fasteners contained therein into work. The lower portion of the piston is substantially circular and between the lower portion and the enlarged upper portion is an intermediate portion which is formed with four projecting portions, each two of these portions are oppositely extending with respect to one another and each pair of said oppositely extending portions are perpendicular with respect to one another. A coil spring is retained within said piston raceway and surrounds the piston, with the piston raceway having an inwardly extending portion to retain the spring. A resilient bumper is selectively abuttable with the base portion of the piston when the piston is moved downwardly.
Inventors
👤 Richard A Kuhiman
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 21:59
CPC Classifications
B; B25; B25C; B25C3/00; B25C3/002
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
A mallet driven fastener driving machine comprising, in combination, a housing having a magazine, a piston raceway, and a drive channel therewithin, said piston raceway having a pair of spaced inturned portions therewithin, a follower within said magazine adapted to sequentially propel fasteners into operative relationship with said drive channel, a piston reciprocatingly movable within said piston raceway formed with a plurality of outwardly extending lateral flutes, an upper portion adapted to be selectively struck by a mallet, and an enlarged laterally projecting stop portion beneath said flutes, said flutes having a total cross-sectional area substantially less than the total Cross-sectional area of said piston, said stop portion being larger than said inturned portions of said piston raceway, said flutes being the sole portions of said piston abutting said piston raceway above said stop portions, and a coil spring disposed about said piston between said inturned portions biasing said piston into an upward position.
Claim 2
Dependent Claim
154 words
A mallet driven fastener driving machine comprising, in combination, a housing having a magazine, a piston raceway, and a drive channel therewithin, said piston raceway having a pair of spaced inturned portions therewithin, a follower within said magazine adapted to sequentially propel fasteners into operative relationship with said drive channel, a piston reciprocatingly movable within said piston raceway formed with a plurality of outwardly extending lateral flutes, an upper portion adapted to be selectively struck by a mallet, and an enlarged laterally projecting stop portion beneath said flutes, said flutes having a total cross-sectional area substantially less than the total Cross-sectional area of said piston, said stop portion being larger than said inturned portions of said piston raceway, said flutes being the sole portions of said piston abutting said piston raceway above said stop portions, and a coil spring disposed about said piston between said inturned portions biasing said piston into an upward position.
Claim 3
Dependent Claim
42 words
A mallet driven fastener driving machine as described in claim 1 said flutes being four in number, each two of said flutes being oppositely extending with respect to one another and each pair of oppositely extending portions being perpendicular to one another.