Handheld work apparatus

Patent metadata

Field	Value
Publication number	US-10525611-B2
Application number	US-201816133451-A
Country	US
Kind code	B2
Filing date	Sep 17, 2018
Priority date	Sep 15, 2017
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A handheld work apparatus has a combustion engine with a cylinder. A removable cover is fixed via a closure. The closure includes a tensioning element rotatable about a rotational axis and, in the locked position of the closure, is supported on a tension contour. The closure has a damping element. The damping element is held on a section of the cylinder in the axial direction of the rotational axis. During rotation from unlocked into locked position, the tensioning element is moved by the tension contour in the axial direction of the rotational axis. In the locked position of the closure, the tensioning element clamps the section of the cylinder in the axial direction of the rotational axis between a first abutment and a second abutment of the damping element. In the unlocked position of the closure, the tensioning element is held on the damping element on the cylinder.

First claim

What is claimed is:

1. A handheld work apparatus comprising:
a combustion engine for driving a tool;
said combustion engine having a cylinder;
a closure including a tensioning element rotatable about a rotational axis and having a locked position and an unlocked position;
a removable cover which is fixed via said closure;
said tensioning element being supported on a tension contour when said closure is in said locked position;
said tensioning element being configured to be rotated by less than one full revolution so as to adjust said closure from said unlocked position to said locked position;
said closure having an elastic damping element for vibration-damping fixation of said cover;
said damping element having a first abutment configured to support said cover thereon in an axial direction of the rotational axis;
said damping element having a second abutment configured to support said tensioning element thereon in the axial direction of the rotational axis;
said damping element being held on a section of said cylinder in the axial direction of the rotational axis;
said tensioning element being moved by said tension contour in the axial direction of the rotational axis during rotation from said unlocked position of said closure into said locked position of said closure;
said tensioning element, when said closure is in said locked position, being configured to clamp said section of said cylinder in the axial direction of the rotational axis between said first abutment and said second abutment of said damping element; and,
said tensioning element being held on said damping element on said cylinder when said closure is in said unlocked position.

2. The work apparatus of claim 1 , wherein:
said tensioning element has a tensioning section, a counterholder and a shaft;
said tensioning section has at least one locking element;
said at least one locking element is supported on said tension contour when said closure is in said locked position;
said at least one locking element and said counterholder are interconnected via said shaft; and,
said shaft at least partially projects through said damping element.

3. The work apparatus of claim 2 , wherein:
said damping element defines an opening;
said shaft is arranged in said opening; and,
said damping element has a region which surrounds said opening and at least partially overlaps a contour of said tensioning section when said closure is in said unlocked position and thereby secures said tensioning element on said damping element in the axial direction of the rotational axis.

4. The work apparatus of claim 3 , wherein:
said damping element defines a slot which, in one of said locked position and said unlocked position of said closure, at least partially overlaps with said at least one locking element; and,
said slot is dimensioned such that, for mounting said tensioning element on said damping element, said tensioning section can be pushed through said slot by elastic deformation of said damping element when said damping element is not held on said cylinder.

5. The work apparatus of claim 2 , wherein:
said cylinder has a receptacle;
said damping element is arranged in said receptacle of said cylinder; and,
said receptacle is configured to rotationally secure said damping element about the rotational axis.

6. The work apparatus of claim 2 further comprising at least one disc arranged between said counterholder and said second abutment of said damping element.

7. The work apparatus of claim 2 further comprising:
a stop formed between said tensioning element and said damping element;
said locking element and said counterholder defining a distance (a) between each other measured in the axial direction of the rotational axis;
said tension contour and said counterholder defining a smallest distance (b) between each other measured in the axial direction of the rotational axis; and,
said stop defining a position of said tensioning element in relation to said first abutment of said damping element with respect to the axial direction of the rotational axis in such a manner that, when said closure is in said unlocked position with said cover placed thereon, said distance (a) is greater than said smallest distance (b).

8. The work apparatus of claim 2 , wherein:
said tensioning element has an adjusting device for adjusting said tensioning element between said unlocked position and said locked position of said closure; and,
said adjusting device is arranged on said tensioning section.

9. The work apparatus of claim 1 further comprising:
a latching unit configured to act between said tensioning element and said damping element in order to secure a rotational position of said tensioning element; and,
said tensioning element having a latching position assigned to the position thereof in said locked position.

10. The work apparatus of claim 9 , wherein:
said damping element defines an opening;
said tensioning element has a shaft;
said shaft is arranged in said opening; and,
said latching unit is formed between said shaft of said tensioning element and said opening of said damping element.

11. The work apparatus of claim 9 , wherein:
said tensioning element has a counterholder; and,
said latching unit is formed between said counterholder and said damping element.

12. The work apparatus of claim 1 , wherein:
said cylinder has a cooling rib; and,
said damping element at least partially lies against said cooling rib of said cylinder.

13. The work apparatus of claim 1 , wherein:
said cylinder has a cooling rib;
said second abutment runs in an inclined manner with respect to said cooling rib of said cylinder; and,
said damping element is beveled on a transverse side.

14. The work apparatus of claim 1 , wherein said tension contour is arranged on said cover.

15. The work apparatus of claim 1 further comprising:
a covering for said closure;
said tensioning element including a tensioning section having at least one locking element; and,
said covering being held on said cover and at least partially covering said at least one locking element.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Kurzenberger Jan
• Kapinsky Ulrich
• Hartinger Roland

Classifications

• B27B17/0033 Primary

  Devices for attenuation of vibrations · CPC title

• B25F5/02

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

• F02B63/02 Primary

  for hand-held tools · CPC title

• F02B77/00

  Component parts, details or accessories, not otherwise provided for · CPC title

• B25F5/006 Primary

  Vibration damping means · CPC title