Reciprocating tool with inverse bushing

Patent metadata

Field	Value
Publication number	US-10207347-B2
Application number	US-201314109153-A
Country	US
Kind code	B2
Filing date	Dec 17, 2013
Priority date	Dec 27, 2012
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

In one embodiment, a reciprocating tool includes a reciprocating plunger, the plunger including an inner wall defining a chamber portion within the plunger, a motor operably connected to the plunger, and a bushing located at least partially within the chamber and contacting the inner wall.

First claim

The invention claimed is:

1. A reciprocating tool, comprising:
a plunger configured to reciprocate along an axis, the plunger including an inner wall defining a chamber portion within the plunger;
a motor operably connected to the plunger;
a bushing located at least partially within the chamber and configured to support the plunger as the plunger reciprocates by contacting the inner wall with a non-reciprocating spherical portion of the bushing; and
a reciprocating counterweight wrapping at least partially about an outer wall of the plunger.

2. The reciprocating tool of claim 1 , further comprising:
a pivot arm assembly operably connected to the plunger and to the counterweight such that as the plunger moves forwardly, the counterweight moves rearwardly.

3. The reciprocating tool of claim 2 , wherein:
the counterweight is movable between a forward-most location and a rearward-most location; and
when the counterweight is at the rearward-most location, the head portion is at least partially surrounded by the counterweight.

4. The reciprocating tool of claim 1 , wherein:
the bushing includes a stem portion;
a maximum diameter of the stem portion is less than a maximum diameter of the spherical portion; and
the stem portion is mounted within a receptacle defined by a housing portion of the reciprocating tool.

5. The reciprocating tool of claim 4 , wherein the receptacle and the chamber portion are axially aligned.

6. A method of operating a reciprocating tool, comprising:
rotating a shaft with a motor;
translating the rotation of the shaft into a reciprocating motion of a plunger;
supporting the reciprocating plunger with a non-reciprocating spherical head of a bushing located at least partially within a chamber defined by the plunger; and
reciprocating a counterweight wrapped at least partially about an outer wall of the plunger in opposition to the reciprocation of the plunger.

7. The method of claim 6 , wherein supporting the reciprocating plunger comprises:
contacting an inner wall of the chamber with the spherical head portion of the bushing.

8. The method of claim 6 , wherein reciprocating the counterweight comprises:
reciprocating the counterweight using a pivot arm assembly operably connected to the plunger and to the counterweight such that as the plunger moves forwardly, the counterweight moves rearwardly.

9. The method of claim 8 , wherein:
the counterweight is movable between a forward-most location and a rearward-most location; and reciprocating the counterweight comprises:
reciprocating the counterweight to a rearward-most location whereat the non-reciprocating spherical head portion of the bushing is located within the chamber and is at least partially surrounded by the counterweight.

10. A reciprocating tool, comprising:
a plunger configured to reciprocate along an axis, the plunger including an inner wall defining a chamber portion within the plunger;
a motor operably connected to the plunger;
a bushing located at least partially within the chamber and configured to support the plunger as the plunger reciprocates by contacting the inner wall with a non-moving head portion of the bushing; and
a reciprocating counterweight wrapping at least partially about an outer wall of the plunger, wherein:
the bushing includes a stem portion;
a maximum diameter of the stem portion is less than a maximum diameter of the head portion; and
the stem portion is mounted within a receptacle defined by a housing portion of the reciprocating tool.

11. The reciprocating tool of claim 10 , further comprising:
a pivot arm assembly operably connected to the plunger and to the counterweight such that as the plunger moves forwardly, the counterweight moves rearwardly.

12. The reciprocating tool of claim 11 , wherein:
the counterweight is movable between a forward-most location and a rearward-most location; and
when the counterweight is at the rearward-most location, the head portion is at least partially surrounded by the counterweight.

13. The reciprocating tool of claim 10 , wherein the receptacle and the chamber portion are axially aligned.

14. The reciprocating tool of claim 13 , wherein the head portion is a spherical head portion.

Assignees

• Bosch Tool Corp
• Bosch Gmbh Robert

Inventors

• Moreno Jaime
• Holmes Brad

Classifications

• Y10T74/18256

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• B23D49/162 Primary

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• Y10T83/04

  Processes · CPC title

• Y10T83/9481

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