Rotary hammer

Patent metadata

Field	Value
Publication number	US-9849577-B2
Application number	US-201414325733-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Feb 3, 2012
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A rotary power tool includes a housing, a spindle defining a working axis, and a motor supported by the housing. The motor is operable to drive the spindle. The rotary power tool also includes a handle movably coupled to the housing and a vibration isolating assembly disposed between the housing and the handle. The vibration isolating assembly attenuates vibration transmitted from the housing to the handle. A battery pack is removably coupled directly to the handle and configured to provide power to the motor.

First claim

What is claimed is:

1. A rotary power tool comprising:
a housing;
a spindle defining a working axis;
a motor supported by the housing and operable to drive the spindle;
a handle movably coupled to the housing;
a vibration isolating assembly disposed between the housing and the handle for attenuating vibration transmitted from the housing to the handle; and
a battery pack removably coupled directly to the handle and configured to provide power to the motor;
wherein the handle includes an upper portion and a lower portion, and wherein the vibration isolating assembly includes an upper joint coupling the upper portion of the handle to the housing and a lower joint coupling the lower portion of the handle to the housing;
wherein each of the upper and lower joints includes a rod extending into the handle and a biasing member disposed between the handle and the housing, the biasing member operable to bias the handle toward an extended position;
wherein each of the upper and lower joints further includes a first bracket fixed to one of the housing and the rod and a second bracket coupled to the other of the housing and the rod, wherein at least one of the first bracket and the second bracket limits movement of the handle to the extended position;
wherein each of the upper and lower joints further includes a guide disposed within the handle, the guide being slidable along the rod as the handle moves between the extended position and the retracted position;
wherein each of the upper and lower joints further includes a bumper disposed between the guide and the handle, the bumper operable to attenuate vibration transmitted along a second axis orthogonal to the working axis.

2. The rotary power tool of claim 1 , further comprising:
a battery receptacle located on the handle, the battery receptacle configured to receive the battery pack when the battery pack is coupled to the handle, and wherein the battery receptacle defines an insertion axis along which the battery pack is slidable that is oriented substantially parallel to the working axis of the spindle.

3. The rotary power tool of claim 2 , wherein the battery receptacle is located on the handle adjacent the lower portion.

4. The rotary power tool of claim 1 , further comprising an upper bellows surrounding at least a portion of the upper joint and a lower bellows surrounding at least a portion of the lower joint.

5. The rotary power tool of claim 1 , wherein at least one of the upper joint and the lower joint is operable to attenuate vibration transmitted along a first axis parallel to the working axis.

6. The rotary power tool of claim 5 , wherein both the upper joint and the lower joint are operable to attenuate vibration transmitted along a first axis parallel to the working axis.

7. The rotary power tool of claim 5 , wherein at least one of the upper joint and the lower joint is operable to attenuate vibration transmitted along a third axis orthogonal to the first axis and the second axis.

8. The rotary power tool of claim 7 , wherein both the upper joint and the lower joint are operable to attenuate vibration transmitted along the third axis.

9. The rotary power tool of claim 1 , further comprising
a tool bit coupled to the spindle; and
an impact mechanism operable to deliver axial impacts to the tool bit.

10. The rotary power tool of claim 9 , wherein the impact mechanism includes
a reciprocating piston disposed within the spindle;
a striker selectively reciprocable within the spindle in response to reciprocation of the piston; and
an anvil that is impacted by the striker when the striker reciprocates toward the tool bit, the anvil configured to transfer the impact to the tool bit.

11. The rotary power tool of claim 1 , wherein the motor is a brushless direct-current motor.

12. The rotary power tool of claim 1 , wherein the vibration isolating assembly substantially isolates the battery pack from vibration produced during operation of the rotary power tool.

13. The rotary power tool of claim 1 , wherein the battery pack is a rechargeable lithium-ion battery pack.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Wyler Andrew R
• Ebner Jeremy R

Classifications

• B25D2217/0092

  being spring-mounted · CPC title

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B25D17/043

  Handles resiliently mounted relative to the hammer housing (B25D17/046 takes precedence) · CPC title

• B25D17/24

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

• B25D11/005

  Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface · CPC title