Connection assembly for a hand-guided machine tool and hand-guided machine tool

Patent metadata

Field	Value
Publication number	US-12576503-B2
Application number	US-202017414358-A
Country	US
Kind code	B2
Filing date	Jul 30, 2020
Priority date	Nov 5, 2019
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A connection assembly for connecting a tool head and a further machine module of a hand-guided machine tool wherein the connection assembly includes at least two connection parts following one another along a longitudinal axis and each having a connection section via which the connection parts are connectable to one another.

First claim

The invention claimed is:

1 . Connection assembly for connecting a tool head and a further machine module of a hand-guided machine tool, wherein the connection assembly comprises at least two connection parts following one another along a longitudinal axis and each having a connection section via which the connection parts are connectable to one another, wherein the connection sections each delimit an inner cross section to the outside such that an inner chamber having a volume is formed, characterized in that inside the volume of the inner chamber of the connection section of a first of the connection parts a mechanical clamping element is arranged and inside the volume of the inner chamber of the connection section of the other connection part a mechanical counter element is arranged, wherein on the connection section of the first connection part an actuatable clamping device is provided that acts on the clamping element, wherein the clamping element and the counter element are configured in such a way that they can be brought into engagement with one another when the connection sections are plugged together and wherein, by actuating the clamping device, the connection parts are braceable against one another when the clamping element is in engagement with the counter element, and wherein the mechanical clamping element is wholly enclosed within the volume of the chamber when the mechanical clamping element is in engagement and out of engagement with the mechanical counter element, wherein the counter element is displaceably guided on the second connection part and is mounted on the second connection part or on the connection section of the second connection part by interposition of a spring, wherein the counter element is coupled to or merges with a retaining portion, wherein the retaining portion includes an angled portion, and wherein the spring is disposed between the angled portion and the transverse bolt on the second connection part.

2 . Connection assembly according to claim 1 , wherein the connection parts are detachably connectable to each other.

3 . Connection assembly according to claim 1 , wherein the clamping device has a manually operable clamping lever and is configured in such a way that, for clamping the connection parts via the clamping element and counter element, only this clamping lever has to be operated.

4 . Connection assembly according to claim 1 , wherein the clamping element is rotatably mounted on the clamping device and is biased relative to the counter element, so that the clamping element and the counter element automatically engage with each other when the connection sections are plugged together.

5 . Connection assembly according claim 1 , wherein the clamping element is fixed to the first connection part and/or the counter element is fixed to the second connection part by means of a transverse bolt respectively, wherein the transverse bolt projects transversely or obliquely to the longitudinal axis through the cross section of the respective connection part and engages with its ends in a recess formed in the wall of the connection part or in a passage formed in the wall of the connection part respectively.

6 . Connection assembly according to claim 5 , wherein the clamping device comprises a bearing part which wraps around the transverse bolt of the first connection part and defines a bearing point spaced from the transverse bolt and having a bearing axis oriented obliquely or orthogonally to the central longitudinal axis of the transverse bolt.

7 . Connection assembly according to claim 6 , wherein the clamping lever is pivotably mounted on the bearing point of the bearing part via a lever shaft, wherein the clamping element is coupled to the lever shaft by means of an eccentric.

8 . Connection assembly according to claim 1 , wherein at the connection portion of the first connection part a manually operable pushbutton is provided, which acts on the clamping element, wherein by operating the pushbutton the clamping element and the counter element can be disengaged.

9 . Connection assembly according to claim 1 , wherein the clamping device is configured in such a way that, after the clamping element has been released, the clamping lever can be moved further in the opening direction in order to disengage the clamping element and the counter element.

10 . Connection assembly according to claim 1 , wherein on the connection section of the first connection part a projection is formed, that, when the clamping lever is in the position in which the clamping element is braced, adjoins a free end of the clamping lever.

11 . Connection assembly according to claim 1 , wherein an electrical plug connector and/or a connection opening to a flow channel formed in the respective connection part is arranged on the connection sections respectively, wherein the plug connector and/or the connection opening is arranged within the cross section of the respective connection section.

12 . Connection assembly according to claim 11 , wherein one or more dust removal openings are formed in the plug connector adjacent to its plug contacts.

13 . Connection assembly according to claim 1 , wherein at least one of the plug connectors is mounted on the connection section or on the connection part via an elastic element respectively.

14 . Connection assembly according to claim 13 , wherein the plug connector is returnable by the elastic element into a central, initial position.

15 . Connection assembly according to claim 1 , wherein the connection section of the first connection part has a collar projecting parallel to the longitudinal axis, with which the collar of the connection section of the first connection part encompasses the connection section of the other connection part when plugged together.

16 . Connection assembly according to claim 1 , wherein a further connection part is provided, which has a connection portion at both ends respectively in such a way that the further connection part can be inserted as an extension piece between the first and the second connection part and can be detachably connected thereto.

17 . Machine tool comprising a tool head, a further machine module and a connection assembly for connecting the tool head and the further machine module, wherein the connection assembly comprises at least two connection parts following one another along a longitudinal axis and each having a connection section via which the connection parts are connectable to one another, wherein the connection sections each delimit an inner cross section to the outside such that an inner chamber having a volume is formed, characterized in that inside the volume of the inner chamber of the connection section of a first of the connection parts a mechanical clamping element is arranged and inside the volume of the inner chamber of the connection section of the other connection part a mechanical counter element is arranged, wherein on the connection section of the first connection part an actuatable clamping device is provided that acts on the clamping element, wherein the clamping element and the counter element are configured in such a way that they can be brought into engagement with one another when the connection sections are plugged together and wherein, by actuating the clamping device, the connection parts are braceable against one another when the clamping element is in engagement with the counter element and wherein the mechanical clamping element is wholly enclosed within the volume of the chamber when the mechanical clamping element is in engagement and out of e

Assignees

• Festool Gmbh

Inventors

• Tulodziecki Stefan
• Albrecht Hans-Peter

Classifications

• Y10T403/595

  Lever · CPC title

• B24B7/184

  pole sanders · CPC title

• B24B41/00

  Component parts such as frames, beds, carriages, headstocks · CPC title

• B24B37/34

  Accessories · CPC title

• B24B37/11

  Lapping tools · CPC title