Impact tool with vibration isolation

Patent metadata

Field	Value
Publication number	US-12447599-B2
Application number	US-202318132836-A
Country	US
Kind code	B2
Filing date	Apr 10, 2023
Priority date	Aug 22, 2019
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

An impact tool is provided with vibration isolators to reduce vibrations felt by the operator gripping the handle of the tool. The impact tool has a hammer and an anvil that impact against each other during use. The impacts create undesirable vibrations in the tool housing and noise in the work area. The isolators are useful in minimizing such vibrations and noise.

First claim

The invention claimed is:

1. An impact tool, comprising:
a motor;
a hammer comprising a first drive member rotatably driven by the motor;
an anvil comprising a second drive member, the first drive member of the hammer periodically engaging and disengaging the second drive member of the anvil such that the first and second drive members impact against each other;
a tool housing enclosing the hammer and a portion of the anvil and comprising a handle grippable by a user;
a bushing disposed between the anvil and the tool housing; and
a first vibration isolator disposed circumferentially between the anvil and the tool housing to reduce transmission of vibrations from the hammer to the tool housing, wherein the first vibration isolator is viscoelastic.

2. The impact tool according to claim 1 , further comprising a second vibration isolator disposed axially between the second drive member of the anvil and the tool housing.

3. The impact tool according to claim 2 , wherein the bushing comprises a flange extending radially outward from a tubular portion of the bushing, wherein the flange is disposed between the second drive member of the anvil and the tool housing, and the second vibration isolator is disposed axially between the flange and the tool housing.

4. The impact tool according to claim 3 , wherein the flange is rotationally restrained to the tool housing.

5. The impact tool according to claim 1 , wherein the first vibration isolator has a Shore A durometer hardness of 30-100.

6. The impact tool according to claim 1 , wherein the first vibration isolator is non-metal.

7. The impact tool according to claim 1 , further comprising a roller bearing disposed between a shaft rotatably driving the hammer and the tool housing, wherein a second vibration isolator is disposed axially between the roller bearing and the tool housing.

8. An impact tool, comprising:
a motor;
a hammer comprising a first drive member rotatably driven by the motor;
an anvil comprising a second drive member, the first drive member of the hammer periodically engaging and disengaging the second drive member of the anvil such that the first and second drive members impact against each other;
a tool housing enclosing the hammer and a portion of the anvil and comprising a handle grippable by a user;
a bushing disposed between the anvil and the tool housing; and
a first vibration isolator disposed circumferentially between the anvil and the tool housing to reduce transmission of vibrations from the hammer to the tool housing,
wherein the bushing comprises an inner metal tubular member, an outer metal tubular member, and the first vibration isolator is disposed between and adhered to the inner and outer metal tubular members.

9. An impact tool, comprising:
a motor;
a hammer comprising a first drive member rotatably driven by the motor;
an anvil comprising a second drive member, the first drive member of the hammer periodically engaging and disengaging the second drive member of the anvil such that the first and second drive members impact against each other;
a tool housing enclosing the hammer and a portion of the anvil and comprising a handle grippable by a user;
a bushing disposed between the anvil and the tool housing;
a first vibration isolator disposed circumferentially between the anvil and the tool housing to reduce transmission of vibrations from the hammer to the tool housing; and
a camshaft rotating in response to the motor, the hammer being disposed about the camshaft and the camshaft rotatably driving the hammer, wherein the hammer moves axially back-and-forth relative to the camshaft while rotating relative to the anvil to engage and disengage the first drive member from the second drive member.

10. The impact tool according to claim 9 , further comprising a second vibration isolator disposed between the camshaft and the anvil.

11. The impact tool according to claim 10 , wherein the second vibration isolator is disposed between a flange of the camshaft and a flange of the anvil.

12. An impact tool, comprising:
a motor;
a hammer comprising a first drive member rotatably driven by the motor;
an anvil comprising a second drive member, the first drive member of the hammer periodically engaging and disengaging the second drive member of the anvil such that the first and second drive members impact against each other;
a tool housing enclosing the hammer and a portion of the anvil and comprising a handle grippable by a user;
a bushing disposed between the anvil and the tool housing; and
a first vibration isolator disposed circumferentially between the anvil and the tool housing to reduce transmission of vibrations from the hammer to the tool housing,
wherein the motor is an electric motor rotationally driving a camshaft, wherein a second vibration isolator is disposed between the electric motor and the tool housing.

13. An impact tool, comprising:
a motor;
a hammer comprising a first drive member rotatably driven by the motor;
an anvil comprising a second drive member, the first drive member of the hammer periodically engaging and disengaging the second drive member of the anvil such that the first and second drive members impact against each other;
a tool housing enclosing the hammer and a portion of the anvil and comprising a handle grippable by a user;
a bushing disposed between the anvil and the tool housing;
a first vibration isolator disposed circumferentially between the anvil and the tool housing to reduce transmission of vibrations from the hammer to the tool housing; and
a second vibration isolator disposed circumferentially between the roller bearing and the tool housing.

Assignees

• Ingersoll Rand Industrial Us Inc

Inventors

• Mandal Madan
• Mcclung Mark T

Classifications

• B25D2250/371

  Use of springs · CPC title

• B25B21/02 Primary

  with means for imparting impact to screwdriver blade or nut socket · CPC title

• B25F5/006 Primary

  Vibration damping means · CPC title

• B25D17/11

  Arrangements of noise-damping means {(noise damping in general G10K11/16)} · CPC title

• B25D17/24

  Damping the reaction force {(resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966)} · CPC title