Hammer head with interference fit

Patent metadata

Field	Value
Publication number	US-11148271-B2
Application number	US-201816204395-A
Country	US
Kind code	B2
Filing date	Nov 29, 2018
Priority date	Nov 29, 2018
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A dead blow hammer head with end caps coupled to a central body through an interference fit. The ends of the body can be flared axially and radially outward and interference fit with the recesses to maximize the surface area overlap between the ends of the body and the recesses. By maximizing the surface area overlap, stress concentrations and failure are reduced. The hammer head can also include a shot or other mass that is unobstructed by screws or pins due to the interference fit of the hammer head components. The interference fit can become stronger during use with each impact further solidifying the surface area overlap between the ends and central portion of the hammer head.

First claim

What is claimed is:

1. A hammer head comprising:
a front end cap having opposing first and second front end cap ends, a first cavity extending from the second front end cap end into the front end cap towards the first front end cap end, and a front recess disposed circumferentially around an interior of the first cavity proximal to a bottom of the first cavity and extending radially and axially outwardly;
a rear end cap having opposing first and second rear end cap ends, a second cavity extending from the second rear end cap end into the rear end cap towards the first rear end cap end, and a rear recess disposed circumferentially around an interior of the second cavity proximal to a bottom of the second cavity and extending radially and axially outwardly; and
a body having first and second body terminal ends respectively disposed in the first and second cavities, wherein the first and second body terminal ends are flared radially and axially outwardly and respectively interference fit within the front and rear recesses, and the interference fit between the front end cap and the body is strengthened by driving the first body terminal end further into the front recess when the front end cap is struck.

2. The hammer head of claim 1 , wherein the body is hollow.

3. The hammer head of claim 2 , wherein the body is a cylinder.

4. The hammer head of claim 1 , wherein the rear end cap includes a pointed portion supported by a base portion, the pointed portion is located proximate the first rear end cap end.

5. A hammer head comprising:
a front end cap having a front recess extending circumferentially around an interior of the front end cap and radially and axially outwardly;
a rear end cap having a rear recess extending circumferentially around an interior of the rear end cap and radially and axially outwardly; and
a body having first and second body terminal ends that are flared radially and axially outwardly and respectively interference fit with the front and rear recesses, and the interference fit between the front end cap and the body is strengthened by driving the first body terminal end further into the front recess when the front end cap is struck.

6. The hammer head of claim 5 , wherein the front recess is located between first and second opposing first end cap ends of the first end cap, and the rear recess is located between first and second opposing rear end cap ends of the second end cap.

7. The hammer head of claim 5 , wherein the body is hollow.

8. The hammer head of claim 7 , wherein the body is a cylinder.

9. The hammer head of claim 5 , wherein the rear end cap includes a pointed portion supported by a base portion, the pointed portion being located proximate the first rear end cap end.

Assignees

• Snap On Tools Corp

Inventors

• Bendorf Scott A

Classifications

• F16B11/002

  by pressing the elements together so as to obtain plastic deformation (shrinkage connections, force fits F16B4/00; pin-and-hole connections involving plastic deformation F16B17/00) · CPC title

• B25D1/14

  having plural striking faces · CPC title

• F16B4/004 Primary

  Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment (F16B4/002 takes precedence) · CPC title

• B25D1/12 Primary

  having shock-absorbing means · CPC title

• B25D1/02

  Inserts or attachments forming the striking part of hammer heads (B25D1/08 - B25D1/14 take precedence) · CPC title