Patent ID: 11858057
Assignee: TELWIN S.P.A.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. Battery-powered electronic resistance welding machine for sheet metal repair, comprising
a machine unit (10), which includes a handle (12), and at least one activation and deactivation button (13),
at least one first rod (14) constrained in a sliding fashion (F) by a first elastic element (19) to a terminal (15) of said machine unit (10), said terminal (15) being positioned on the opposite side with respect to said handle (12) and said first rod (14) having, at one free end opposite to said terminal (15), a ground electrode or tip (16) that comes into contact with at least one metal portion to create an electrical circuit, wherein said metal portion is a welding resistance of said circuit,
at least one second rod (17), constrained in a sliding fashion (F) by a second elastic element (19) to said terminal (15) of said machine unit (10), said second rod (17) having, at one free end opposite to said terminal (15), a welding electrode or tip (18) for the fixing of repair accessories of said metal portion,
said first and second elastic elements (19) having a sleeve-like shape partially wrapping a respective said first and said second rods (14, 17) and are compression loaded that counteract the sliding movement of said first and second rods (14, 17) towards the inside of the machine unit (10),
characterized in that a rechargeable battery (11) is placed inside said machine unit (10), said rechargeable battery (11) being directly connected both to a microprocessor electronic circuit (20) for its power supply and to said first and second rods (14, 17);
said microprocessor electronic circuit (20) is directly connected to said first and second rods (14, 17) which are directly connected to an electronic control device (21) being also directly connected to said rechargeable battery (11);
wherein said microprocessor electronic circuit (20) is adapted to modulate a welding energy and power through said electronic control device (21),
and wherein, when said electronic control device (21) is closed, an electrical closed circuit is established, said electrical closed circuit comprises said rechargeable battery (11), said ground electrode or tip (16), said metal portion and said welding electrode or tip (18), wherein said ground electrode or tip (16) and said welding electrode or tip (18) are in contact with said metal portion.