Impact tool anvil having a transition region with multiple attributes

Patent metadata

Field	Value
Publication number	US-12036653-B2
Application number	US-202117199990-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 12, 2020
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

Systems and methods for management of material stresses present at transitions between facets of an anvil and the anvil shaft are described. In one aspect, an apparatus includes an impact tool anvil extending along an axis of extension and having a faceted drive end and a shaft body which is connected to the faceted drive end through a transition region that couples respective faces of the faceted drive end to the shaft body, the transition region including a sweeping radius surface having a first axial end and a second axial end, the first axial end connected to a respective face of the faceted drive end, the first axial end having a tangency with the respective face of the faceted drive end; and an angular transition having a slope that radially rises from the second axial end of the sweeping radius surface to the shaft body.

First claim

What is claimed is:

1. An apparatus comprising:
an impact tool anvil extending along an axis of extension and having a faceted drive end and a shaft body which is connected to the faceted drive end through a transition region that couples respective faces of the faceted drive end to the shaft body, the transition region including
a sweeping radius surface having a first axial end and a second axial end, the first axial end connected to a respective face of the faceted drive end, the first axial end having a tangency with the respective face of the faceted drive end;
an angular transition having a slope that radially rises from the second axial end of the sweeping radius surface to the shaft body;
a tapered neck extending from the shaft body towards the first axial end, the tapered neck longitudinally adjacent to the angular transition and a portion of the sweeping radius surface;
a stop feature configured to halt axial motion towards the shaft body by a socket positioned onto at least a portion of the faceted drive end, the stop feature sharing a first edge with the sweeping radius surface axially adjacent the first axial end; and
a chine feature extending from the tapered neck to the stop feature and defining a second edge extending between the tapered neck and the stop feature.

2. The apparatus of claim 1 , wherein the faceted drive end has a square drive shape.

3. The apparatus of claim 1 , wherein the shaft body is defined by a circular cross sectional shape.

4. The apparatus of claim 1 , wherein the slope of the angular transition is a constant slope.

5. The apparatus of claim 1 , wherein the sweeping radius surface includes a cross sectional increase in material from the first axial end to the second axial end.

6. The apparatus of claim 1 , wherein the stop feature is aligned with respective corners at an intersection of the respective faces of the faceted drive end.

7. The apparatus of claim 1 , wherein the impact tool anvil is coupled with a power tool, the impact tool anvil located within the power tool.

8. The apparatus of claim 7 , wherein the power tool is one of an electric corded power tool, an electric cordless power tool, a hydraulic power tool, and a pneumatic power tool.

9. The apparatus of claim 7 , further comprising a motor and a hammer each disposed within the power tool, the motor configured to drive the hammer, the hammer configured to deliver a force to the impact tool anvil upon being driven by the motor.

Assignees

• Ingersoll Rand Industrial Us Inc

Inventors

• Eardley Edward Charles

Classifications

• B25D2217/0003

  Details of shafts of percussive tool bits · CPC title

• B25D2250/051

  Couplings, e.g. special connections between components · CPC title

• B25D2217/0015

  Anvils · CPC title

• B25D2250/095

  Electric motors · CPC title

• B25D17/005

  Attachments or adapters placed between tool and hammer · CPC title