| 摘要 |
An attachment to a hand-held power drill comprising: drill mount wing screw spring rods compression springs pressure pins pin ring The attachment is mated with the drill by sliding drill mount 24 to the drill seat and tightening wing screw 40. Drill mount 24 can be made of metal or any standard manufacturing polymer. The inside surface must be suitable for gripping the drill seat under moderate pressure from wing screw 40. Wing screw 40 is an off the shelf item that must sized to hold said attachment to said drill seat. Spring rods 35 are hollow or solid cylinders of metal between drill mount 24 to which they are fixedly attached, and pin ring 28 where they are disposed by a slip fit. Compression springs 20 encircle spring rods 35 and are sized in length to provide pressure between drill mount 24 and pin ring 28. In operation, compression springs 20 transfer pressure from the user to the drill bit and pressure pins 29. Pressure pins 29 are pointed metal pins fixedly attached to pin ring 28 and receive pressure from pin ring 28 which in turn receives pressure from compression springs 20 which are seated in drill mount 24. Pin ring 28 is a disk of solid hard material with threaded blind holes 32 to receive pressure pins 29 and spring rod through holes 39 to receive spring rods 35. Pin ring 28 must be of sufficient thickness and spring rod through holes 39 must be of fine enough tolerance so as to maintain perpendicularity to spring rods 35 during operation. |
