US 12,313,374 B2
One-piece gunstock of advanced composite material for firearm and manufacturing method thereof
Bernardino Merelli, Parre (IT)
Assigned to Sabatti S.p.A., Gardone Val Trompia (IT)
Appl. No. 18/684,576
Filed by Sabatti S.p.A., Gardone Val Trompia (IT)
PCT Filed Aug. 25, 2022, PCT No. PCT/EP2022/073719
§ 371(c)(1), (2) Date Feb. 16, 2024,
PCT Pub. No. WO2023/031021, PCT Pub. Date Mar. 9, 2023.
Claims priority of application No. 102021000022535 (IT), filed on Aug. 30, 2021.
Prior Publication US 2024/0263913 A1, Aug. 8, 2024
Int. Cl. F41C 23/18 (2006.01); B29C 35/02 (2006.01); B29C 70/44 (2006.01); B29K 63/00 (2006.01); B29K 105/08 (2006.01); B29K 307/04 (2006.01); B29L 31/00 (2006.01)
CPC F41C 23/18 (2013.01) [B29C 35/0227 (2013.01); B29C 70/44 (2013.01); B29K 2063/00 (2013.01); B29K 2105/08 (2013.01); B29K 2307/04 (2013.01); B29L 2031/777 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A process for manufacturing a one-piece gunstock for firearm, wherein the one-piece gunstock comprises a frame having two half-shells extended longitudinally and defining a recess inside the frame, a plurality of seats and a space for housing respective mechanical components formed between said half-shells and delimited by a transversal connection element of said half-shells,
the process comprising the steps of:
providing a mould split into two half-moulds having each a recess with a shape being complementary to the external shape of one of the half-shells of the frame of the one-piece gunstock to be manufactured;
arranging at least one sheet of an advanced composite material comprising fibres and a resin in one of the half-moulds so as to fill in the recess of said half-mould without projecting therefrom;
arranging at least one sheet of an advanced composite material comprising fibres and a resin in the other half-mould so as to fill in the recess of the other half-mould and project from said recess;
inserting into said other half-mould at least one bag having an open end portion projecting from said other half-mould;
inserting into said other half-mould at least one shaped insert being adapted to define internal recesses of the frame of the gunstock to be manufactured;
coupling said half-moulds, keeping said open end portion of at least one bag outside the resulting mould and thereby obtaining the overlap of the sheets of advanced composite material arranged in said half-moulds;
inserting said mould into a vacuum bag and arranging said open end portion of at least one bag in communication with the outside;
generating vacuum in said vacuum bag so as to extract air from said mould;
curing the resin of the sheets in the mould kept under vacuum and generating a pressure inside at least one bag through said open end portion thereof in communication with the outside so as to compact the sheets inside the mould, thus obtaining said one-piece frame;
extracting said one-piece frame from the mould.