Handheld, hand-guided cutting-off machine

Patent metadata

Field	Value
Publication number	US-10821571-B2
Application number	US-201615778902-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Nov 25, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A handheld, hand-guided cutting-off machine ( 10 ), which includes a rotating cutting-off wheel, a supporting housing part ( 36 ), an output shaft, which is rotatably supported around an output axis ( 40 ), a drive motor, a transmission mechanism ( 19 ), which connects the drive motor to the output shaft, a flange and a safety guard ( 24 ), which covers the cutting-off wheel over a covering area. The cutting-off wheel is rotatably fixedly mounted on the output shaft with the aid of the flange and surrounded by the safety guard ( 24 ), which is pivotable around a pivot axis. The safety guard ( 24 ), the supporting housing part ( 36 ) and the transmission mechanism ( 19 ) have maximum distances from the output axis ( 40 ) over an outcut angle (θ), which are less than or equal to half the flange diameter of the flange.

First claim

What is claimed is:

1. A handheld, hand-guided cutting-off machine comprising:
a supporting housing part;
a cutting-off wheel having a wheel diameter;
an output shaft rotatably supported around an output axis on the housing part with the aid of a bearing element;
a drive motor and a transmission mechanism connecting the drive motor to the output shaft, the transmission mechanism being situated on the housing part;
a flange having a flange diameter, the cutting-off wheel being rotatably fixedly situatable on the output shaft with the aid of the flange; and
a safety guard having a covering area at least partially covering the cutting-off wheel, and a machining area exposing the cutting-off wheel, the safety guard being pivotably supported around a pivot axis on the housing part;
the flange diameter of the flange corresponding to a minimum flange diameter, and the safety guard having a first maximum distance from the output axis over a first angle range, the supporting housing part having a second maximum distance from the output axis over a second angle range, and the transmission mechanism has a third maximum distance from the output axis over a third angle range, wherein the first, second and third maximum distances are less than or equal to half the minimum flange diameter.

2. The cutting-off machine as recited in claim 1 wherein the safety guard is adjustable between a front and a rear pivot position, an outcut angle formed as an intersection between the first, second and third angle ranges, being different than zero for at least one pivot position of the safety guard.

3. The cutting-off machine as recited in claim 2 wherein the outcut angle is different than zero for all pivot positions of the safety guard between the front and the rear pivot positions.

4. The cutting-off machine as recited in claim 1 wherein the pivot axis of the safety guard is displaced with respect to the output axis of the output shaft by a distance into the covering area of the safety guard.

5. The cutting-off machine as recited in claim 4 wherein a size of the first angle range is dependent on a pivot position of the safety guard.

6. The cutting-off machine as recited in claim 1 wherein the transmission mechanism includes an output disk situated on the output shaft, and a transmission element transmitting a movement of the drive motor to the output disk, the output disk having a fourth maximum distance and the transmission element having a fifth maximum distance from the output axis over the third angle range, wherein the fourth and fifth maximum distances are less than or equal to half the minimum flange diameter.

7. The cutting-off machine as recited in claim 6 wherein the transmission mechanism includes a cover covering the output disk and the transmission element, the cover having a sixth maximum distance from the output axis over the third angle range, the sixth maximum distance being less than or equal to half the minimum flange diameter.

8. The cutting-off machine as recited in claim 7 wherein the drive motor is a combustion motor, and the cutting-off wheel is designed as a diamond cutting-off wheel or as an abrasive cutting-off wheel.

9. The cutting-off machine as recited in claim 1 wherein the drive motor is an electric motor, and the cutting-off wheel is designed as a diamond cutting-off wheel or as a bound, reinforced cutting-off wheel.

Assignees

• Hilti Ag

Inventors

• Greitmann Ralf
• Veik Guenther
• Specht Helmut

Classifications

• B24B23/02

  with rotating grinding tools; Accessories therefor · CPC title

• B23Q11/06

  Safety devices for circular cutters · CPC title

• B24B55/052

  with rotating tools · CPC title

• B24B27/08 Primary

  being portable · CPC title