US 12,280,482 B2
Driving device for electric nail gun
An-Gi Liu, Taichung (TW); Chang-Sheng Lin, Taichung (TW); and Fu-Ying Huang, Taichung (TW)
Assigned to Basso Industry Corp., Taichung (TW)
Filed by BASSO INDUSTRY CORP., Taichung (TW)
Filed on Jun. 5, 2023, as Appl. No. 18/329,226.
Claims priority of application No. 111140447 (TW), filed on Oct. 25, 2022.
Prior Publication US 2024/0131671 A1, Apr. 25, 2024
Prior Publication US 2024/0227145 A9, Jul. 11, 2024
Int. Cl. B25C 1/04 (2006.01)
CPC B25C 1/041 (2013.01) [B25C 1/047 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A driving device adapted for use in an electric pneumatic nail gun, the electric pneumatic nail gun including a muzzle seat that is disposed for accommodating a nail therein, a nail-striking pin that is mounted in the muzzle seat and that is pneumatically movable along an axis to strike the nail in a striking direction, and a lifting gear that is mounted to the muzzle seat, and that is rotatable by electric power to engage the nail-striking pin and to drive the nail-striking pin to move along the axis in a pressure-generating direction opposite to the striking direction, said driving device comprising:
a striking unit that includes
a striking cylinder adapted to be connected to the muzzle seat, and having an inner surface that surrounds the axis and that defines a cylinder chamber, said cylinder chamber having an opening that is adapted to be opposite to the muzzle seat along the axis, and
a piston disposed in said striking cylinder, making an air-tight contact with said inner surface, and adapted to be connected co-movably to the nail-striking pin;
an air storage unit that includes
an air storage cylinder including
an inner wall surface that cooperates with said striking cylinder to define an air storage chamber therebetween, said air storage chamber being in fluid communication with said cylinder chamber via said opening such that, when said piston is moved together with the nail-striking pin in the pressure-generating direction, air in said air storage chamber is pressurized for pushing said piston in the striking direction to drive the nail-striking pin to strike the nail, and
at least one protrusion that protrudes from said inner wall surface toward said opening; and
a lubricant disposed in said cylinder chamber and said air storage chamber, and flowing from said inner wall surface along said at least one protrusion onto said inner surface via said opening to lubricate movement of said piston;
wherein said at least one protrusion has a wave-shaped cross-section along the axis, and includes a base portion protruding from said inner wall surface and a crest portion extending from said base portion and tapering toward said opening.