US 11,992,927 B2
Pneumatic chipping hammer
Peter Grübl, Eichendorf (DE); and Martin Brixel, Kirchdorf (DE)
Assigned to Wacker Chemie AG, Munich (DE)
Appl. No. 17/283,176
Filed by Wacker Chemie AG, Munich (DE)
PCT Filed Oct. 8, 2018, PCT No. PCT/EP2018/077344
§ 371(c)(1), (2) Date Apr. 6, 2021,
PCT Pub. No. WO2020/074058, PCT Pub. Date Apr. 16, 2020.
Prior Publication US 2021/0339370 A1, Nov. 4, 2021
Int. Cl. B25D 9/02 (2006.01); B02C 1/00 (2006.01); B25D 9/08 (2006.01); B25D 17/24 (2006.01); C30B 29/06 (2006.01); C30B 35/00 (2006.01)
CPC B25D 9/02 (2013.01) [B02C 1/005 (2013.01); B25D 9/08 (2013.01); B25D 17/24 (2013.01); C30B 29/06 (2013.01); C30B 35/007 (2013.01); B25D 2217/0073 (2013.01); B25D 2250/181 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A pneumatic chisel, in particular for comminuting polycrystalline silicon, comprising:
a housing having a double-acting pneumatic cylinder in which a piston comprising a chisel is movably arranged along a longitudinal axis, wherein the cylinder has a work-side section and a return-side section, wherein the return-side section comprises a damping portion and a pressure-equalization opening and wherein the work-side section comprises an end-position damping member and a compressed air connection;
a compressed air reservoir connected to the return-side section of the cylinder; and
a chisel guide housing comprising a sealing air chamber and an opening for transporting away any abrasion particles formed by the motion of the piston and the chisel, wherein the piston is constructed as one piece with the chisel.