Hand tool impacting device with floating pin mechanism

Patent metadata

Field	Value
Publication number	US-9981364-B2
Application number	US-201514793368-A
Country	US
Kind code	B2
Filing date	Jul 7, 2015
Priority date	Dec 20, 2010
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A hand tool impacting device may include, a drive shaft with an aperture, an impaler disk, and a floating pin positioned within the aperture of the drive shaft. A set of circular ramps on the outer edge of the impaler disk may interact with a stationary pin insert to translate the drive shaft and create an impacting motion. A pair of springs placed against either side of the floating pin may allow a specialized tool bit to engage or disengage the impaler disk, thereby allowing selective use of translational impacting motion, or rotational torque. An impact bit for engaging the impaler disk may include, a tool head configured to engage a work piece and a tool shaft configured to be inserted into a hollow drive shaft to engage a floating pin. According to one embodiment, the impact bit includes a number of sleeves to guide the tool head during operation.

First claim

What is claimed is:

1. A hand tool, comprising:
an impacting device configured to be operably coupled to an external power source, the impacting device including:
a hollow drive shaft;
an impaler disk coaxially aligned with the drive shaft, the impaler disk including an impacting surface including a plurality of first ramps and a plurality of second ramps; and
a floating pin extending radially through the drive shaft;

a tool chuck coupled to a distal end of the drive shaft; and
an impact bit removably coupled in the tool chuck, the impact bit including:
a tool shaft coupled to the tool chuck;
a tool head coupled to a distal end of the tool shaft and configured to engage a work piece; and
a tool shank extending from a proximal end of the tool shaft,

wherein the tool shank extends into the hollow drive shaft to engage the floating pin, the floating pin engaging the impacting surface of the impaler disk in response to engagement of the tool shank and the floating pin, and, in response to rotation of the hollow drive shaft in a first direction, a first end portion of the floating pin is positioned against a flat step surface of a first ramp of the plurality of first ramps of the impaler disk, and a second end of the floating pin is positioned against a flat step surface of a second ramp, of the plurality of first ramps, of the impaler disk, such that the impaler disk rotates together with the drive shaft.

2. The hand tool of claim 1 , wherein the tool head includes:
a tool head shaft; and
a planar impacting surface at a distal end of the tool head shaft.

3. The hand tool of claim 2 , wherein the impact bit also includes:
an outer sleeve having a proximal end coupled to the tool shaft;
an inner sleeve coaxially coupled to the outer sleeve, a portion of the inner sleeve extending out of the outer sleeve, beyond a distal end of the outer sleeve; and
a sleeve spring positioned in the outer sleeve.

4. The hand tool of claim 3 , wherein the sleeve spring is positioned between a proximal end of the inner sleeve and the distal end of the tool shaft.

5. The hand tool of claim 4 , wherein the tool head is positioned within the outer sleeve such that the sleeve spring and the outer sleeve surround the tool head.

6. The hand tool of claim 5 , wherein the portion of the inner sleeve extending out of the outer sleeve is moved to a position within the outer sleeve in response to compression of the sleeve spring.

7. The hand tool of claim 5 , wherein the inner sleeve is configured to reciprocate within the outer sleeve in response to engagement of the tool shank with the floating pin, and engagement of the floating pin with the impacting surface of the impaler disk.

8. The hand tool of claim 3 , wherein the tool shaft includes:
a first section having a polygonal cross section;
a second section having a polygonal cross section; and
a transition section connecting the first section and the second section.

9. The hand tool of claim 8 , wherein the first section of the tool shaft is coupled to the tool chuck, the second section of the tool shaft is coupled to the tool head and the outer sleeve, and the tool shank extends outward from the first section of the tool shaft.

10. The hand tool of claim 1 , wherein the plurality of first ramps are arcuate and are arranged along an inner peripheral edge of the impacting surface of the impaler disk, and the plurality of second ramps are arcuate and are arranged along an outer peripheral edge of the impacting surface of the impaler disk, surrounding the plurality of first ramps.

11. The hand tool of claim 10 , wherein, in response to engagement of the tool shank and the floating pin and rotation of the hollow drive shaft in a second direction, the first end of the floating pin and the second end of the floating pin each move along an inclined surface of a respective first ramp of the plurality of first ramps, then down the flat step surface of the respective first ramp of the plurality of first ramps, and then along the inclined surface and flat stepped surface of subsequent adjacent first ramps, such that the hollow drive shaft rotates independent of the impaler disk.

12. The hand tool of claim 1 , further comprising:
a housing that encompasses the hollow drive shaft, impaler disk, and floating pin; and
a backing plate attached to an open end of the housing and configured to attach the housing to a tool shell.

13. The hand tool of claim 1 , wherein the hollow drive shaft is configured to be coupled to a motor and a drive train so as to receive a rotational force generated by the motor.

14. A hand tool, comprising:
an impacting device configured to be received in a tool shell, and configured to receive a driving force from a motor received in the tool shell, the impacting device including:
an impaler disk coaxially aligned with a hollow drive shaft;
wherein the impaler disk comprises a plurality of first arcuate ramps and a plurality of second arcuate ramps concentrically arranged on an impacting surface; and
a floating pin extending radially through the drive shaft, the floating pin selectively engaging the plurality of first arcuate ramps of the impaler disk in response to engagement of the floating pin with a tool shank of an impact bit;

a tool chuck coupled to the impacting device; and
the impact bit coupled to the tool chuck, the tool chuck transferring the driving force from the impacting device to the impact bit, the impact bit including:
a tool shaft coupled to the tool chuck, the tool shaft including:
a first section having a polygonal cross section, the first section engaging the tool chuck; and
a second section having a polygonal cross section;
a tool head coupled to the second section of the tool shaft and configured to engage a work piece;
an outer sleeve coupled to the second section of the tool shaft and surrounding the tool head;
an inner sleeve positioned within the outer sleeve and surrounding the tool head; and

the tool shank extending outward from the first section of the tool shaft, and into the hollow drive shaft of the impacting device so as to engage the floating pin of the impacting device.

15. The hand tool of claim 14 , wherein the impact bit also includes:
a sleeve spring positioned in the outer sleeve, surrounding the tool head, between a proximal end of the inner sleeve and the second section of the tool shaft, wherein the inner sleeve is configured to reciprocate within the outer sleeve in response to engagement of the tool shank with the floating pin, and engagement of the floating pin with the impacting surface of the impaler disk.

16. The hand tool of claim 15 , wherein,
in response to engagement of the tool shank and the floating pin and rotation of the hollow drive shaft in a first direction, a first end of the floating pin is positioned against a flat step surface of a first ramp of the plurality of first ramps, and a second end of the floating pin is positioned against the flat step surface of a second ramp of the plurality of first ramps such that the impaler disk rotates together with the drive shaft, and
in response to engagement of the tool shank and the floating pin and rotation of the hollow drive shaft in a second direction, the first end of the floating pin and the second end of the floating pin each move along an inclined surface of a respective first ramp of the plurality of first ramps, then down the flat step surface of the respective first ramp of the plurality of first ramps, and then along the inclined surface and flat stepped surface of subsequent adjacent first ramps such tha

Assignees

• Univ Brigham Young

Inventors

• Mattson Christopher Andrew
• Allred Jake
• Alsup Jeremy
• Anderson Travis
• Christensen David
• Morrise Jacob
• Ward Jon

Classifications

• B25D17/088

  with radial movable locking elements co-operating with bit shafts specially adapted therefor · CPC title

• B25D2217/0034

  Details of shank profiles · CPC title

• B25B21/023 Primary

  for imparting an axial impact, e.g. for self-tapping screws · CPC title

• B25D11/102

  the rotating axis of the cam member being coaxial with the axis of the tool · CPC title

• B25D16/00

  Portable percussive machines with superimposed rotation {, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B6/00)} · CPC title