초록 ▼

A handy electric nailing gun includes a firing pin, a firing spring for pushing the firing pin to drive nails into workpiece, an output gear rotatable by a motor through a transmission gear set to retract the firing pin during the first half run of each rotation cycle and to release the firing pin d

A handy electric nailing gun includes a firing pin, a firing spring for pushing the firing pin to drive nails into workpiece, an output gear rotatable by a motor through a transmission gear set to retract the firing pin during the first half run of each rotation cycle and to release the firing pin during the second half run of each rotation cycle, and three power switches electrically connected in series between the motor and the power source (AC adapter/rechargeable battery) for operation by the user to control the operation of the motor.

대표청구항 ▼

What the invention claimed is: 1. A handy electric nailing gun comprising: a housing, said housing comprising handhold means for holding by hand, an elongated nail chamber adapted to accommodate nails, said nail chamber having an inner closed end and an outer open end, a follower spring installed i

What the invention claimed is: 1. A handy electric nailing gun comprising: a housing, said housing comprising handhold means for holding by hand, an elongated nail chamber adapted to accommodate nails, said nail chamber having an inner closed end and an outer open end, a follower spring installed in the inner closed end of said nail chamber and adapted to push loaded nails toward the outer open end of said nail chamber, a barrel perpendicularly aimed at the outer open end of said nail chamber; a power unit, said power unit comprising a power source, a first power switch, and a second power switch, said first power switch and said second power switch being electrically connected in series to said power source and each having a switching rod; a transmission unit, said transmission unit comprising a motor electrically connected to said power unit, a transmission gear set rotatable by said motor, and an output gear meshed with said transmission gear set and rotatable by said transmission gear set upon operation of said motor, said output gear having a series of teeth arranged around a part of the periphery thereof and a push rod; a striking mechanism controllable by said transmission unit to drive nails out of said nail chamber, said striking mechanism comprising a firing pin, said firing pin having a longitudinal rack formed integral with the periphery thereof for engagement with the teeth of said output gear, and a firing spring connected between one end of said firing pin and a part inside said housing and adapted to push said firing pin toward the outer open end of said nail chamber to drive one nail out of said nail chamber after disengagement of said rack from the teeth of said output gear; and a control unit adapted to control on/off of said power unit, said control unit comprising a first control button adapted to press the switching rod of said first power switch and to further switch on said first power switch, a second control button adapted to control on/off status of said second power switch, a press member coupled to said housing and pressed on the switching rod of said second power switch to switch off said second power switch, said press member having an elongated coupling hole coupled to a pivot pin inside said housing, a push block controllable by said second control button to move said press member away from the switching rod of said second power switch and to further switch on said second power switch, and a return spring adapted to return said press member after said press member has been moved away from the switching rod of said second power switch by said push block. 2. The handy electric nailing gun as claimed in claim 1, wherein said first control button and said second control button are respectively supported on a respective spring member in said housing. 3. The handy electric nailing gun as claimed in claim 2, wherein said output gear has a push rod perpendicularly extended from one side thereof and adapted to turn said press member about the pivot pin inside said housing between a first position where said press member is maintained engaged with said push block and movable away from the switching rod of said second power switch by said second control button and a second position where said press member is disengaged from said push block and not movable by said second control button; said push block has a beveled front guide edge. 4. The handy electric nailing gun as claimed in claim 1, wherein said barrel has a longitudinal slot for accommodating said rack of said firing pin. 5. The handy electric nailing gun as claimed in claim 1, wherein said power source is an AC adapter. 6. The handy electric nailing gun as claimed in claim 1, wherein said power source is a rechargeable battery. 7. The handy electric nailing gun as claimed in claim 1, wherein said press member has a receiving hole holding a spring member that supports said push block. 8. The handy electric nailing gun as claimed in claim 1, wherein said control unit further comprises a third power switch electrically connected in series between said power source and said second power switch, an actuating rod mounted in said housing movable in and out of said housing between an on position and an off position to switch on/off said third power switch, a spring member supporting said actuating rod in said on position, and a press rod fixedly connected to said actuating rod and movable with said actuating rod to switch on/off said third power switch. 9. The handy electric nailing gun as claimed in claim 1, wherein said striking mechanism further comprises a locating plate axially movably mounted in a rear side inside said barrel and stopped at one end of said firing spring against said firing pin, and an adjustment screw mounted in said housing for rotation by the user to move said locating plate in said barrel and to further adjust the spring force of said firing spring.