Hand-guided power tool

Patent metadata

Field	Value
Publication number	US-10814469-B2
Application number	US-201715728754-A
Country	US
Kind code	B2
Filing date	Oct 10, 2017
Priority date	Oct 31, 2016
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A power tool has a handle operatively connected with vibration damping across a vibration gap to a drive motor with throttle element. An actuating device on the handle actuates the throttle element pivotably supported in a housing. A coupling element bridging the vibration gap connects actuating device to throttle element. The actuation movement of the actuation device is transmitted as rotation about an axis transverse to the vibration gap. An intermediate element is pivotably supported on an actuating element connected to the throttle element. The coupling element acts on the intermediate element and, over part of the actuation movement, contacts a contact region of the intermediate element. A guide for the intermediate element changes a position of the contact region relative to the housing based on a rotational position of the actuating element by changing a pivot position of the intermediate element relative to the housing.

First claim

What is claimed is:

1. A hand-guided power tool comprising:
a drive motor;
a tool driven by the drive motor;
at least one handle that is operatively connected across a vibration gap to the drive motor so as to be vibration-decoupled from the drive motor;
an actuating device arranged on the at least one handle and configured to actuate a throttle element of the drive motor, wherein the throttle element is arranged in a housing and is pivotably supported on a first axis of rotation in the housing;
a coupling element operatively connecting the actuating device to the throttle element, wherein the coupling element bridges the vibration gap and transmits an actuation movement of the actuation device as a rotary movement about a second axis of rotation that is arranged transverse to the vibration gap;
an actuating element connected to the throttle element;
an intermediate element pivotably supported about a pivot axis on the actuating element, wherein the coupling element is acting on the intermediate element and wherein the coupling element, over at least part of the actuation movement of the actuation device, contacts a contact region of the intermediate element;
a guide structure configured to guide the intermediate element, wherein the guide structure is a slider guide and comprises a guide path and a slider guided in the guide path, wherein the guide path and the slider form a first guide part and a second guide part, wherein the first guide part is connected fixedly and non-rotatably to the housing of the throttle element, and wherein the intermediate element comprises the second guide part;
wherein the guide structure is configured to change a position of the contact region of the intermediate element relative to the housing as a function of a rotational position of the actuating element by changing a pivot position of the intermediate element relative to the housing.

2. The power tool according to claim 1 , wherein the guide structure attributes to each position of the pivot axis of the intermediate element at the actuating element a rotational position of the intermediate element about the pivot axis.

3. The power tool according to claim 1 , wherein the intermediate element comprises a lateral projecting section, wherein the coupling element is contacting a side of the lateral projecting section which is facing the pivot axis of the intermediate element.

4. The power tool according to claim 1 , wherein the throttle element is pivotably supported on the first axis of rotation to be movable between a first end position of the throttle element and a second end position of the throttle element.

5. The power tool according to claim 4 , wherein the coupling element is rotatably supported in a rotary bearing which is fixedly connected to the housing.

6. The power tool according to claim 4 , wherein the slider, in at least one of the first end position and the second end position of the throttle element, has a spacing relative to a correlated end of the guide path that is correlated with the at least one of the first end position and the second end position of the throttle element.

7. The power tool according to claim 4 , wherein the slider comprises a securing section, wherein the securing section engages behind a first longitudinal side of the guide path and secures the guide path in a direction of the pivot axis of the intermediate element on the slider.

8. The power tool according to claim 4 , wherein the slider is contacting a contact line on the guide path.

9. The power tool according to claim 4 , wherein the intermediate element is configured to be connected to the actuating element only when the intermediate element and the actuating element are in a position which is correlated with the second end position of the throttle element, wherein the second end position of the throttle element is a completely open position of the throttle element.

10. The power tool according to claim 4 , wherein the first end position of the throttle element is a closed position of the throttle element, wherein the intermediate element comprises a blocking contour which, in the first end position of the throttle element, interacts with the actuating element and limits a movement of the intermediate element in a direction extending from the contact region toward the pivot axis of the intermediate element.

11. A hand-guided power tool comprising:
a drive motor;
a tool driven by the drive motor;
at least one handle that is operatively connected across a vibration gap to the drive motor so as to be vibration-decoupled from the drive motor;
an actuating device arranged on the at least one handle and configured to actuate a throttle element of the drive motor, wherein the throttle element is arranged in a housing and is pivotably supported on a first axis of rotation in the housing;
a coupling element operatively connecting the actuating device to the throttle element, wherein the coupling element bridges the vibration gap and transmits an actuation movement of the actuation device as a rotary movement about a second axis of rotation that is arranged transverse to the vibration gap;
an actuating element connected to the throttle element;
an intermediate element pivotably supported about a pivot axis on the actuating element, wherein the coupling element is acting on the intermediate element and wherein the coupling element, over at least part of the actuation movement of the actuation device, contacts a contact region of the intermediate element;
a guide structure configured to guide the intermediate element, wherein the guide structure is configured to change a position of the contact region of the intermediate element relative to the housing as a function of a rotational position of the actuating element by changing a pivot position of the intermediate element relative to the housing;
wherein the throttle element is pivotably supported on the first axis of rotation to be movable between a first end position of the throttle element and a second end position of the throttle element;
wherein the guide structure is a slider guide and comprises a guide path and a slider guided in the guide path;
wherein the slider comprises a securing section, wherein the securing section engages behind a first longitudinal side of the guide path and secures the guide path in a direction of the pivot axis of the intermediate element on the slider;
wherein the guide path has a longitudinal direction and a width measured transverse to the longitudinal direction, wherein the securing section comprises a first long side and a second short side, wherein the first long side has a first length greater than the width of the guide path, wherein the second short side has a second length smaller than the width of the guide path, and wherein, in no position of the intermediate element between the first end position of the throttle element and the second end position of the throttle element, the second short side is oriented perpendicular to the longitudinal direction of the guide path.

12. A hand-guided power tool comprising:
a drive motor;
a tool driven by the drive motor;
at least one handle that is operatively connected across a vibration gap to the drive motor so as to be vibration-decoupled from the drive motor;
an actuating device arranged on the at least one handle and configured to actuate a throttle element of the drive motor, wherein the throttle element is arranged in a housing and is pivotably supported on a first axis of rotation in the housing;
a coupling element operatively connecting the actuating device to the throttle element, wherein the coupling element bridges the vibration gap and transmits an

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Schulz Andreas
• Zurek Przemyslaw
• Harer Matthias

Classifications

• B27B17/00

  Chain saws; Equipment therefor {(slotting or mortising machines equipped with chain cutters B27F5/06)} · CPC title

• B25F5/02

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

• B23D59/00

  Accessories specially designed for sawing machines or sawing devices (lubricating or cooling machine tools in general B23Q11/12) · CPC title

• B23D57/023

  hand-held or hand-operated · CPC title

• B25F5/006 Primary

  Vibration damping means · CPC title