US 11,911,831 B2
Boring head with a mechanism for clamping a displaceable tool carrier
Jose Maria Fenollosa Climent, Hünenberg (CH); Lukas Thalmann, Winterthur (CH); Manuel Martin, Zürich (CH); Pascal Rohrer, Niederhasli (CH); and Christoph Stüssi, Zürich (CH)
Assigned to Big Kaiser Prazisionswerkzeuge AG, (CH)
Appl. No. 17/613,692
Filed by Big Kaiser Prazisionswerkzeuge AG, Rümlang (CH)
PCT Filed May 28, 2020, PCT No. PCT/EP2020/064816
§ 371(c)(1), (2) Date Nov. 23, 2021,
PCT Pub. No. WO2020/239897, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 19177207 (EP), filed on May 29, 2019.
Prior Publication US 2022/0219246 A1, Jul. 14, 2022
Int. Cl. B23B 29/03 (2006.01); B23B 29/034 (2006.01)
CPC B23B 29/03414 (2013.01) [B23B 2229/16 (2013.01); B23B 2260/108 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A boring head comprising
a tool body having a main rotation axis about which the tool body rotates during boring operations;
a tool carrier arranged in or on the tool body;
a first motor for displacing the tool carrier relative to the tool body along a displacement direction, the first motor being an electric motor with a stator and a rotor, wherein a main drive axis is defined by the rotation of the rotor during operation of the first motor, which main drive axis extends in parallel to the displacement direction; and
a clamping mechanism with a clamping element for effecting a clamping force on the tool carrier, in order to prevent a displacement of the tool carrier relative to the tool body during boring operations,
wherein the clamping mechanism is an active clamping mechanism which effects a clamping force that can be adjusted actively in such a way that an energy flow takes place from an energy source to the clamping mechanism, when the clamping mechanism is activated and/or is in its activated state,
wherein the clamping mechanism is based on the piezoelectric effect and comprises at least one piezo element, and
wherein the clamping element is adapted to be moved away from the tool carrier by means of an expansion of the piezo element as a result of an electric voltage acting on the piezo element.