US 4,277,209 A · Threading attachment

Abstract

A reversible driver for a threading tool, such as a tap or die, is disclosed. The driver has rotary input and output members with a forward clutch connected therebetween and a reverse clutch connected through reverse gearing between the input and the output members. Each clutch has drive and driven clutch elements and a first spring urges both forward and reverse clutches toward engagement. A second spring is stronger than the first spring and urges the forward clutch toward engagement so that a tap rotated by the output member will tap a hole in a workpiece until the forward clutch is released. Each clutch utilizes a plurality of substantially hemispherical projections engaging longitudinal abutments as a form of dog clutch. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Claims12

Dependent claims

A threading attachment, comprising in combination,

an outer case,
input and output members coaxially journalled relative to each other in said case,
a clutch having drive and driven clutch elements and connected between said input and output members,
one of said clutch elements having a plurality of substantially axially parallel abutment shoulders,
the other of said clutch elements having substantially hemispherical non-rotating lateral projections adapted to rotationally engage said shoulders for a dog clutch engaged condition,
said clutch elements being relatively longitudinally movable apart to establish a clutch disengaged condition, and
spring means relatively urging said clutch elements longitudinally toward engagement, whereby a threading tool rotated by said output member will thread a workpiece until the clutch is disengaged.

4 more elements

Dependencies are inferred from the claim text.

Threading attachment

Life of this patent

Threading attachment

Life of this patent

Abstract

Claims12