Electrical work apparatus having vibration decoupling

Patent metadata

Field	Value
Publication number	US-11052529-B2
Application number	US-201815912308-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 4, 2017
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

The invention relates to an electrical work apparatus including an apparatus housing having an electric motor for driving a work tool, a control unit for putting the electric motor into operation, a handle housing having at least one handle for guiding the work apparatus, and a receiving cavity, realized in the handle housing, having an insertion opening for a battery pack for operating the electric motor. For the purpose of decoupling the battery pack in respect of vibration, the handle housing, together with the receiving cavity for the battery pack, is decoupled from the apparatus housing via one and the same antivibration element. A vibration gap is realized between the apparatus housing and the handle housing, wherein the antivibration element at least partly bridges the vibration gap.

First claim

What is claimed is:

1. An electrical work apparatus comprising:
a work tool;
an apparatus housing;
an electric motor mounted in said apparatus housing and configured to drive said work tool;
a control unit configured for starting said electric motor;
a handle housing having a back handle for guiding the electrical work apparatus;
said handle housing defining a receiving cavity having an insertion opening for a battery pack for operating said electric motor;
said receiving cavity being configured to hold the battery pack inside said handle housing in an exchangeable manner;
an antivibration element;
said handle housing together with said receiving cavity being decoupled from said apparatus housing via said antivibration element;
said apparatus housing and said handle housing conjointly defining a vibration gap therebetween;
said antivibration element being disposed so as to at least partially bridge said vibration gap between said housing apparatus and said handle housing;
said back handle being distal to said work tool;
said handle housing further including a front handle proximal to said work tool;
said back handle and said front handle conjointly defining a straight connecting reference line; and,
said receiving cavity being disposed between said front handle and said back handle at least partially on said straight connecting reference line, wherein the battery pack is rigidly held in said receiving cavity.

2. The work apparatus of claim 1 , wherein said receiving cavity is configured such that no relative movements between said receiving cavity and the battery pack occur during operation.

3. The work apparatus of claim 1 further comprising:
a contact strip disposed in said receiving cavity; and,
said contact strip and the battery pack configured such that no relative movements between said contact strip and the battery pack occur during operation.

4. The work apparatus of claim 1 , wherein:
the battery pack has contacts; and,
the contacts and said handle housing are configured such that no relative movements between said handle housing and the contacts occur during operation.

5. The work apparatus of claim 1 , wherein the battery pack and said handle housing are conjointly configured to vibrate as a common mass system relative to said apparatus housing.

6. The work apparatus of claim 1 , wherein said antivibration element is configured to effect a vibration decoupling of the battery pack.

7. The work apparatus of claim 1 , wherein said receiving cavity and said back handle form said handle housing which is a common, fixedly connected handle housing.

8. The work apparatus of claim 1 , wherein:
the work apparatus defines a first longitudinal axis; and,
said receiving cavity defines a second longitudinal axis lying at an angle of 70° to 110° to said first longitudinal axis.

9. The work apparatus of claim 1 , wherein:
the work apparatus defines a first longitudinal axis; and,
said receiving cavity defines a second longitudinal axis lying in said first longitudinal axis.

10. The work apparatus of claim 1 , wherein the battery pack is held in said receiving cavity via a releasable snap-in latch.

11. The work apparatus of claim 1 , wherein said antivibration element is an elastic molded part and at least partially bridges said vibration gap.

12. The work apparatus of claim 1 , wherein said antivibration element is a spring.

13. The work apparatus of claim 1 , wherein:
the work apparatus has a front end and a back end;
said work tool is arranged at said front end; and,
said insertion opening is open toward said back end of the work apparatus.

14. The work apparatus of claim 1 further comprising:
a plurality of electrical lines;
said electric motor being configured to receive energy via said electrical lines;
said electrical lines being run as individual lines; and,
said electrical lines bridging said vibration gap at a distance from each other at different locations of said vibration gap.

15. The work apparatus of claim 1 , wherein said work tool defines a work tool plane.

16. The work apparatus of claim 1 , wherein the battery pack has electrical contacts and said receiving cavity defines an insertion direction along which the battery pack is inserted thereinto;
said receiving cavity defines a bottom delimiting said receiving cavity in said insertion direction; and,
wherein said work apparatus further comprises a contact strip mounted on said bottom for electrically connecting to the electric contacts of the battery pack when the battery pack is inserted into said receiving cavity.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Hoche Florian
• Menzel Johannes
• Schmid Marc

Classifications

• H01M50/247

  specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers · CPC title

• B25F5/02 Primary

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

• B25F5/006 Primary

  Vibration damping means · CPC title

• A01G3/053

  motor-driven · CPC title

• B27B17/0033

  Devices for attenuation of vibrations · CPC title