Hand-held power tool

Patent metadata

Field	Value
Publication number	US-9610677-B2
Application number	US-201213370333-A
Country	US
Kind code	B2
Filing date	Feb 10, 2012
Priority date	Feb 17, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A hand-held power tool has a housing with a cylinder chamber. An internal combustion engine is arranged in the housing and the internal combustion engine has a cylinder arranged in the cylinder chamber. A device is provided that detects temperature information in the cylinder chamber when the internal combustion engine is in an inoperative state. An indicator device that indicates the temperature information is provided.

First claim

What is claimed is:

1. A hand-held power tool comprising:
a housing delimiting a cylinder chamber;
an internal combustion engine arranged in said housing;
said internal combustion engine comprising a cylinder arranged in said cylinder chamber at a spacing to said cylinder chamber;
a device that detects temperature information when said internal combustion engine is in an inoperative state;
a visual indicator device that indicates visually said temperature information when said internal combustion engine is in the inoperative state;
wherein said device that detects said temperature information detects the temperature existing in said cylinder chamber, wherein the temperature existing in said cylinder chamber is lower than the temperature of the cylinder due to said spacing;
wherein said device that detects said temperature information and said indicator device require no separate energy supply so that said temperature information can be indicated when said internal combustion engine is in the inoperative state;
wherein said power tool comprises a cold start adjustment and a warm start adjustment, wherein said power tool should be started in said cold start adjustment when cold start conditions exist and should be started in said warm start adjustment when warm start conditions exist;
wherein said temperature information indicates whether the temperature is above or below a temperature threshold value, wherein cold start conditions exist at temperatures below said temperature threshold value and wherein warm start conditions exist at temperatures above said temperature threshold value.

2. The power tool according to claim 1 , wherein said indicator device is visible from an exterior of said housing.

3. The power tool according to claim 1 , wherein said device that detects said temperature information is integrated into said indicator device.

4. The power tool according to claim 3 , wherein said device that detects said temperature information and said indicator device comprise a thermochromic material.

5. The power tool according to claim 4 , wherein said device that detects said temperature information and said indicator device are formed by a film indicator with liquid crystals.

6. The power tool according to claim 1 , comprising a grip that extends across said housing, wherein said indicator device is arranged at least partially underneath said grip.

7. The power tool according to claim 1 , wherein said device that detects said temperature information is arranged at a spacing from said cylinder chamber and connected by a heat conducting element to said cylinder chamber.

8. The power tool according to claim 7 , comprising an operating mode selector.

9. The power tool according to claim 8 , wherein said indicator device is positioned adjacent to said operating mode selector.

10. The power tool according to claim 8 , wherein, adjacent to said operating mode selector, at least one symbol is arranged that matches a symbol of said indicator device.

11. The power tool according to claim 1 , wherein said device that detects said temperature information comprises at least two elements with different thermochromic characteristics.

12. The power tool according to claim 11 , wherein a first one of said at least two elements has correlated therewith a cold start symbol and a second one of said at least two elements has correlated therewith a warm start symbol.

13. A hand-held power tool comprising:
a housing delimiting a cylinder chamber;
an internal combustion engine arranged in said housing;
said internal combustion engine comprising a cylinder arranged in said cylinder chamber at a spacing to said cylinder chamber;
wherein said power tool comprises a cold start adjustment and a warm start adjustment, wherein said power tool should be started in said cold start adjustment when a temperature of said cylinder is below a switching temperature of said cylinder and should be started in said warm start adjustment when the temperature of said cylinder is above said switching temperature of said cylinder;
a device that detects temperature information when said internal combustion engine is in an inoperative state, wherein said device that detects temperature information detects the temperature existing in said cylinder chamber, wherein the temperature existing in said cylinder chamber is lower than the temperature of the cylinder due to said spacing;
a visual indicator device that indicates visually said temperature information;
wherein said temperature information indicates whether the temperature is above or below a temperature threshold value, wherein cold start conditions exist at temperatures below said temperature threshold value and wherein warm start conditions exist at temperatures above said temperature threshold value;
wherein said device that detects said temperature information is arranged such on the power tool that, when said switching temperature exists at said cylinder, said temperature threshold value exists at said device that detects said temperature information.

14. A hand-held power tool comprising:
a housing delimiting a cylinder chamber;
a cover that delimits at least partially said cylinder chamber;
an internal combustion engine arranged in said housing;
said internal combustion engine comprising a cylinder arranged in said cylinder chamber at a spacing to said cover;
wherein said power tool comprises a cold start adjustment and a warm start adjustment, wherein below a switching temperature of said cylinder cold start conditions exist and the power tool should be started in said cold start adjustment and wherein above said switching temperature of said cylinder warm start conditions exist and the power tool should be started in said warm start adjustment;
a device that detects temperature information in said cylinder chamber when said internal combustion engine is in an inoperative state;
a visual indicator device that indicates visually said temperature information;
wherein said temperature information indicates whether a temperature is above or below a temperature threshold value, wherein cold start conditions exist at temperatures below said temperature threshold value and wherein warm start conditions exist at temperatures above said temperature threshold value;
wherein said device that detects said temperature information and said indicator device are arranged in an area of said cover, said area of said cover delimiting said cylinder chamber, such that said temperature threshold value exists at said device that detects said temperature information when said switching temperature exists at said cylinder, wherein a temperature existing in said cylinder chamber is lower than the temperature of the cylinder due to said spacing, and such that said indicator device is visible from an exterior of said housing.

15. The power tool according to claim 14 , wherein said device that detects said temperature information is arranged adjacent to said cylinder on said cover.

Assignees

• Reichler Mark
• Uhl Klaus-Martin
• Stihl Ag & Co Kg Andreas

Inventors

• Reichler Mark
• Uhl Klaus-Martin

Classifications

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B25F5/02 Primary

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