Machine tool, in particular hand machine tool

Patent metadata

Field	Value
Publication number	US-9399275-B2
Application number	US-201013322538-A
Country	US
Kind code	B2
Filing date	Apr 16, 2010
Priority date	May 27, 2009
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A tool machine has a housing assembled by two separate housing parts and an air directing element arranged in the housing, wherein the air directing element is implemented independently from a connection device for connecting the housing parts. The air directing element is forced by a housing part axially in a seat in the other housing part, wherein in the transmission path between the housing parts and the air directing element a spring element is arranged.

First claim

The invention claimed is:

1. A machine tool, comprising:
a housing including:
a first housing part; and
a second housing part that is separate from the first housing part, that has an inner wall that, at least in part, is oblique with respect to a plane perpendicular to a longitudinal axis of the housing, and that includes a seat;

an air guide element positioned in the housing that is configured to guide a flow of an air stream through the housing, and that includes a supporting element that extends axially from the air guide element towards the second housing part, wherein the first housing part is configured to apply a force to press the air guide element into the seat of the second housing part:
the supporting element having an end face that is oblique with respect to the plane perpendicular to the longitudinal axis of the housing and that is substantially in opposition to the oblique part of the inner wall of the second housing part; and
the end face being configured to bear against the oblique part of the inner wall;

a connecting device formed independently of the air guide element, and configured to connect the first and second housing parts; and
a spring element that is positioned in a transmission path between the first housing part, the air guide element, and the second housing part.

2. The machine tool as claimed in claim 1 , wherein the spring element is formed in one part with the air guide element.

3. The machine tool as claimed in claim 2 , wherein the spring element is a resilient supporting element positioned on the air guide element.

4. The machine tool as claimed in claim 1 , comprising a plurality of spring elements distributed over a circumference of the air guide element.

5. The machine tool as claimed in claim 1 , wherein the spring element is supported on the inner wall of the second housing part.

6. The machine tool as claimed in claim 1 , wherein the spring element is configured to be elastically resilient in a radial direction.

7. The machine tool as claimed in claim 1 , wherein the first housing part is configured to hold the air guide element in a circumferential direction via a form fit.

8. The machine tool as claimed in claim 1 , further comprising:
an air distributor supported by the second housing part, wherein:
the air guide element is an air guide ring; and
the air distributor is configured to exert an axial force on the air guide ring.

9. The machine tool as claimed in claim 8 , further comprising:
a fan wheel,
wherein the air guide ring and the air distributor are positioned on axially opposite sides of the fan wheel.

10. The machine tool as claimed in claim 1 , further comprising:
a drive motor disposed within the first housing part, wherein the air guide element further includes a supporting rib that extends axially toward the drive motor, the drive motor and the supporting rib separated by a clearance such that the supporting rib is configured to support the rib in response to a displacement of the drive motor within the first housing part.

11. The machine tool as claimed in claim 10 , wherein the spring element is positioned between the air guide element and the drive motor.

12. The machine tool as claimed in claim 1 , wherein the spring element is a rubber element.

13. The machine tool as claimed in claim 1 , wherein the spring element is a spiral spring or a leaf spring.

14. The machine tool as claimed in claim 1 , wherein the spring element is an active compensating element that is configured to act upon the air guide element.

15. A machine tool, comprising:
a housing including:
a first housing part; and
a second housing part that is separate from the first housing part, that has an inner wall that, at least in part, is oblique with respect to a plane perpendicular to a longitudinal axis of the housing, and that includes a seat,

an air guide element positioned in the housing that is configured to guide a flow of an air stream through the housing, and that includes a supporting element that extends axially from the air guide element towards the second housing part:
the supporting element having an end face that is oblique with respect to the plane perpendicular to the longitudinal axis of the housing and that is substantially in opposition to the oblique part of the inner wall of the second housing part; and
the end face being configured to bear against the oblique part of the inner wall; and

a connecting device formed independently of the air guide element, and configured to connect the first and second housing parts;
wherein the supporting element includes a spring element that is arranged in a transmission path between the first housing part, the air guide element, and the second housing part, and that is configured to act on the air guide element transversely with respect to the longitudinal axis,
wherein the first housing part is configured to act on the air guide element axially with respect to the longitudinal axis and push the air guide element into the seat in the second housing part; and
wherein the spring element, end face, and the oblique part of the inner wall are arranged such that a radial motion of the air guide element is at least partially transformed into an axial motion in order to compensate for the radial motion.

Assignees

• Esenwein Florian
• Lutz Manfred
• Schomisch Thomas
• Bosch Gmbh Robert

Inventors

• Esenwein Florian
• Lutz Manfred
• Schomisch Thomas

Classifications

• B24B23/00 Primary

  Portable grinding machines, e.g. hand-guided; Accessories therefor (B24B7/18 takes precedence; for grinding seat surfaces B24B15/00; having a flexible shaft B24B27/027; grinders for cutting-off B24B27/08; dust extraction equipment B24B55/10; details or components, e.g. casings, bodies of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title

• B25F5/008

  Cooling means · CPC title

• B25F5/02

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