Hand-held knockout punch driver
A hand-held knockout punch driver for use with a punch and a die. The hand-held knockout punch driver having a body with a handle portion and a contact surface, a motor positioned within the body, a draw stud moveable with respect to the body, and a magnetic coupling member configured to releaseably couple the die to the contact surface of the body.
1. A hand-held knockout punch driver comprising:
a housing having a handle portion;
a motor positioned within the housing, the motor being powered by a battery;
a draw stud moveable with respect to the housing, the draw stud having a first portion with a substantially D shaped cross-sectional shape and a second portion having a substantially circular cross-sectional shape; and
an end cap coupled to the housing having an aperture with a substantially D shaped cross-sectional shape corresponding to the D shaped cross-sectional shape of the first potion of the draw stud,
wherein the first portion of the draw stud having the substantially D shaped cross-sectional shape extends through the aperture in the end cap.
2. The hand-held knockout punch driver of claim 1 , further comprising:
a punch;
a die;
a body coupled to the housing and having a contact surface;
wherein the draw stud has the punch or the die coupled thereto; and
a magnetic coupling member configured to releaseably couple the other of the die or the punch to the contact surface of the body.
3. The hand-held knockout punch driver of claim 2 , wherein the coupling member includes a plurality of magnets.
4. The hand-held knockout punch driver of claim 3 , wherein the magnets are equally spaced over the contact surface.
5. The hand-held knockout punch driver of claim 2 , wherein the magnetic coupling member is positioned in the body.
6. The hand-held knockout punch driver of claim 2 , wherein the magnetic coupling member is positioned proximate the contact surface.
7. The hand-held knockout punch driver of claim 2 , wherein the draw stud extends through the contact surface.
8. The hand-held knockout punch driver of claim 2 , further comprising:
a worm gear rotatable by the motor;
a worm wheel rotateably mounted within the body and driven by the worm gear, and wherein the draw stud threadably engages the worm wheel.
9. The hand-held knockout punch driver of claim 8 , wherein the draw stud extends through the contact surface.
10. The hand-held knockout punch driver of claim 2 , wherein the end cap is coupled to the body and at least partially defines the contact surface.
11. The hand-held knockout punch driver of claim 10 , wherein the magnetic coupling member is contained within the end cap.
12. The hand-held knockout punch driver of claim 1 , wherein the first portion includes a first set of threads and the second portion includes a second set of threads.
13. The hand-held knockout driver of claim 12 , wherein the first set of threads is different from the second set of threads.
14. The hand-held knockout punch driver of claim 1 , wherein the first portion of the draw stud defines an axially extending slot.
15. The hand-held knockout punch driver of claim 1 , wherein the first portion of the draw stud includes a first set of threads formed on an exterior of the draw stud on the D shaped cross-sectional shape, and wherein the second portion of the draw stud includes a second set of threads on the substantially circular cross-sectional shape.
16. The hand-held knockout punch driver of claim 15 , further comprising:
a worm gear rotatable by the motor;
a worm wheel having a first set of gear teeth on an outer periphery thereof engaged with the worm gear, and a second set of gear teeth on an inner periphery thereof engaged with the first set of threads on the draw stud.
17. The hand-held knockout punch driver of claim 1 , wherein the complementary D shaped cross-sectional shapes of the first portion of the draw stud and the aperture in the end cap, respectively, rotationally constrain the draw stud to the end cap.