Handheld work apparatus

Patent metadata

Field	Value
Publication number	US-9216517-B2
Application number	US-201113333796-A
Country	US
Kind code	B2
Filing date	Dec 21, 2011
Priority date	Dec 22, 2010
Publication date	Dec 22, 2015
Grant date	Dec 22, 2015

Abstract

A handheld work apparatus has a drive motor ( 8 ) that is held in a motor housing ( 2 ). At least one handle ( 4 ) is provided, with a vibration gap ( 12 ) being formed between the handle ( 4 ) and the motor housing ( 2 ). The vibration gap ( 12 ) permits a relative movement between handle ( 4 ) and motor housing ( 2 ). The handle ( 4 ) is connected to the motor housing ( 2 ) via at least one anti-vibration device ( 13, 14, 15, 16, 31, 49, 50, 63 ) that bridges the vibration gap ( 12 ). The anti-vibration device ( 15, 16, 31, 49, 50, 63 ) has a longitudinal center axis ( 23, 24 ). The anti-vibration device ( 15, 16, 31, 49, 50, 63 ) bridges the vibration gap ( 12 ) via at least one tension element. The anti-vibration device ( 15, 16, 31, 49, 50, 63 ) also has a spring ( 17, 32, 33, 51, 55, 72, 73 ) arranged functionally in series with the tension element.

First claim

What is claimed is:

1. A handheld work apparatus comprising:
a motor housing;
a drive motor held in said motor housing;
at least one handle;
a vibration gap formed between said handle and said motor housing;
said vibration gap being configured to allow a relative movement of said handle and said motor housing;
a first anti-vibration device configured to bridge said vibration gap and interconnect said handle and said motor housing;
said first anti-vibration device defining a longitudinal center axis;
said first anti-vibration device including at least one tension element via which said first anti-vibration device bridges said vibration gap and transmits a tension force between said motor housing and said handle;
a spring operating functionally in series with said tension element so as to cause said tension force to act on said spring;
said first anti-vibration device bridging said vibration gap exclusively via said tension element and said tension element transmits forces only in the direction of said longitudinal center axis;
a second anti-vibration device likewise including a tension element;
a handle frame having an arm over which said motor housing extends;
said handle being part of said handle frame;
said arm having first and second longitudinal sides;
said vibration gap including a first vibration gap segment formed between said motor housing and said first longitudinal side;
said motor housing and said second longitudinal side conjointly defining a second vibration gap segment of said vibration gap; and,
said first and second vibration gap segments being bridged by the tension elements of corresponding ones of said first and second anti-vibration devices.

2. The handheld work apparatus of claim 1 , wherein said tension elements each includes a cable configured to bridge corresponding ones of said vibration gaps.

3. The handheld work apparatus of claim 2 , wherein said cables are a metal cable.

4. The handheld work apparatus of claim 1 , wherein said anti-vibration devices each defines a stop in the direction of said longitudinal center axis which delimits the maximum width (d) the corresponding ones of said vibration gap.

5. The handheld work apparatus of claim 1 further comprising:
each one of said anti-vibration devices including
a receptacle;
the tension element corresponding to said one anti-vibrations device having at least one holding element which is fixedly connected thereto; and,
said holding element being assigned to said receptacle and said holding element being arranged in said receptacle.

6. The handheld work apparatus of claim 5 , wherein the tension element of each one of said anti-vibration devices is supported on the receptacle corresponding thereto.

7. The handheld work apparatus of claim 5 , wherein:
said receptacle has an opening having a diameter (g);
the tension element of each one of said anti-vibration devices has a diameter (h) and is configured to project through said opening of said receptacle;
said diameter (g) of said opening is at least approximately 1.5 times the diameter (h) of the tension element corresponding thereto in the region of said opening.

8. The handheld work apparatus of claim 7 , wherein said holding element has a diameter (f) which is greater than said diameter (g) of said openings of said receptacle.

9. The handheld work apparatus of claim 5 , wherein:
said receptacle has an opening having a diameter (g);
the tension element of each one of said anti-vibration devices has a diameter (h) and is configured to project through said opening of said receptacle;
said diameter (g) of said opening is at least approximately 2 times the diameter (h) of the tension element corresponding thereto in the region of said opening.

10. The handheld work apparatus of claim 5 , wherein said tension elements are held resiliently in the longitudinal direction.

11. The handheld work apparatus of claim 10 further comprising a compression spring arranged between a wall section of said receptacle and said holding element.

12. The handheld work apparatus of claim 11 , wherein said compression spring is a metal spring.

13. The handheld work apparatus of claim 5 , wherein said receptacle is formed in one of said motor housing or said handle.

14. A handheld work apparatus comprising:
a motor housing;
a drive motor held in said motor housing;
at least one handle;
a vibration gap formed between said handle and said motor housing;
said vibration gap being configured to allow a relative movement of said handle and said motor housing;
an anti-vibration device configured to bridge said vibration gap and interconnect said handle and said motor housing;
said anti-vibration device defining a longitudinal center axis;
said anti-vibration device including at least one tension element via which said anti-vibration device bridges said vibration gap and transmits a tension force between said motor housing and said handle;
a compression spring operating functionally in series with said tension element so as to cause said tension force to act on said spring;
said anti-vibration device bridging said vibration gap exclusively via said tension element and said tension element transmits forces only in the direction of said longitudinal center axis;
a receptacle;
said tension element having at least one holding element which is fixedly connected thereto;
said holding element being assigned to said receptacle and said holding element being arranged in said receptacle;
said tension element being held resiliently in the longitudinal direction;
said compression spring arranged between a wall section of said receptacle and said holding element; and,
said handle having said receptacle associated therewith and said compression spring being arranged in said receptacle associated with said handle.

15. A motor-driven chain saw comprising:
a motor housing;
a drive motor held in said motor housing;
a handle frame with a portion thereof defining a handle;
said handle frame and said motor housing conjointly defining a vibration gap therebetween for permitting said handle frame and said motor housing to move relative to each other;
at least two antivibration devices connecting said handle frame to said motor housing;
each of said antivibration devices including a tension element and a spring;
said springs operating functionally in series with corresponding ones of said tension elements;
said handle frame including an arm over which said motor housing extends;
said arm having two longitudinal sides lying opposite each other;
said vibration gap extending along both of said longitudinal sides of said arm;
said tension elements of respective ones of said antivibration devices bridging said vibration gap at corresponding ones of said longitudinal sides;
said vibration gap defining a smallest damping width (b) below which said vibration gap can narrow at one of said longitudinal sides of said arm during operation of the motor-driven chain saw; and,
the one of said antivibration devices associated with said one longitudinal side being configured to transmit no force between said one longitudinal side and said motor housing when there is a drop below said smallest damping width (b).

16. The motor-driven chain saw of claim 15 , wherein the spring of at least one of said anti-vibration devices is pre-tensioned in the rest position of said handle frame and said motor housing.

Assignees

• Kurzenberger Jan
• Menzel Johannes
• Lux Helmut
• Stihl Ag & Co Kg Andreas

Inventors

• Kurzenberger Jan
• Menzel Johannes
• Lux Helmut

Classifications

• B25F5/006

  Vibration damping means · CPC title

• B27B17/0033 Primary

  Devices for attenuation of vibrations · CPC title