Patent GB-864561-A (GB)
Title: Nailing apparatus
IPC: B25C1/00
Filed: 1957-07-11
Abstract: 864,561. Nailing apparatus. REICH, K. M., and REICH, K., [trading as REICH, K. M. [firm of]]. July 11, 1957 [July 13, 1956], No. 22000/57. Class 89(3) In a nailing apparatus wherein compressed air acting upon a nail driving piston in a cylinder causes the piston to drive a nail, a nail is fed to the apparatus along a nail feeding conduit by compressed air the supply of which is controlled by a control valve which has a piston operated by air expelled from the cylinder by the nail driving piston during its working stroke. In Fig. 8, air expelled from the nail driving cylinder due to the driving stroke of the striker piston passes along a pipe 228 and displaces a control piston 202 against a compression spring 225, moving a nail pick up member 204 into a position beneath nail feed rails 206 where it receives a nail 205, and causing a pawl 223 moving with the control piston to ride over the upper end of a lever 222. As soon as the striker piston retracts the piston 202 returns under the action of the spring 225, the nail 205 is deposited into the hopper 207 and the pawl 223 acts against the lever 222 which is thereby rocked to open a valve 219 to allow compressed air from a pipe 217 to act upon the slide valve 211. Thereby the slide valve 211 is moved in opposition to a compression spring 212 so that a transverse aperture 210 is moved out of alignment with the nail feed conduit 208 and so that a pipe 214 is opened to compressed air which flows therethrough into the nail feed conduit 208 to blow a nail previously deposited therein to the nail driving apparatus. The pawl 223 releases the lever 222 at the end of the return stroke of the control piston 202 allowing a spring 218 to close the valve 219 to cause return movement of the slide valve 211 thereby re-aligning the aperture 210 with the conduit 208 and permitting the nail 205 previously deposited in the hopper 207 to pass into the conduit 208. To adjust the duration of supply of compressed air through the conduit 214 into the pipe 208, an adjustable oil dashpot 230 is coupled to the lever 222. In other embodiments, Figs. 1 and 2 (not shown) compressed air is supplied to the slide valve during pressure stroke of the control piston instead of on its return stroke as in Fig. 8, and in Fig. 1 the valve controlling the supply of compressed air is embodied in the control piston itself. In the nail driving apparatus of Fig. 7, air expelled from the space 101<SP>11</SP> during the driving stroke of the striker piston 102 is stored in an annular space 112, and as the striker piston 102 reaches the lower end of its stroke, it engages a member 132 to open a valve 116<SP>1</SP> allowing the stored air to flow into a passage 122<SP>1</SP> and thence to the control piston. This permits several driving strokes to be performed on one nail should this be necessary, the nail feed mechanism being actuated only when the nail is fully driven. An adjustable vent 125 gradually releases the pressure of air supplied through the passage 122<SP>1</SP> to allow proper actuation of the control piston of the nail feeding mechanism. In an alternative form of nail driving apparatus, Fig. 6 (not shown), the striker piston at the lower end of its stroke directly opens a valve to place the operating conduit of the control piston in direct communication with the compressed air supply conduit 109 of the nail driving apparatus.