Patent GB-1114811-A (GB)
Title: Fastener driving apparatus
IPC: B25C1/00
Filed: 1965-10-05
Abstract: 1,114,811. Nailing machines. FASTENER CORPORATION. 5 Oct., 1965 [14 Oct., 1964], No. 42235/65. Heading B4C. A magazine assembly 24 for holding a supply of nails 12 and feeding them into a drive track 28 of a portable or hand-operated, pneumatically or electrically powered nail driving tool comprises at least two guideways 34a, 34b disposed in side-by-side relation for guiding successive nails disposed therein into the drive track 28. Each of the guideways has an open forward end which communicates with the drive track when that guideway is aligned therewith. Shifting means associated with guideway 34a are provided to move guideway 34b into alignment with the drive track when nails in guideway 34a are exhausted. The drive track 28 is formed in a nose-piece 20 of the tool and has slidably disposed therein a nail driving element 30. A nail feed opening 32 in the rear face 26 of the nose-piece communicates with the track 28. The guideways 34a, 34b are opened at the top and are formed between opposed sheet metal side walls 40a and 40b respectively, each of which is formed with longitudinal flutes 42, 44, 46, Fig. 3 (not shown). The flutes 42, 46 serve to accommodate flexible carrier strips 16 between which the nails 12 are held and the flutes 44 serve to accommodate springs 48 which forwardly bias pushers 50a, 50b having enlarged, plate-like portions 51a, 51b, Fig. 5 (not shown), slidably disposed in the respective guideways 34a, 34b and engaging the rearward ones of the nails 12. The leading edges of the pusher plate portions are formed with slots 58a, 58b for engaging the heads of the rearward nails thereby preventing the sets of nails from moving upwardly out of the guideways. The magazine assembly is pivotably mounted at 60, 62, 64 on a depending rearward portion 22 of the tool frame and has a curved forward end to accommodate the pivotal movement. Brackets 68a, 68b are secured to opposite sides of the forward end of the magazine assembly and have outwardly extending top flanges 72a, 72b provided with slots 74 which slidably accommodate pins 76 which are threaded into the forward end portion 18 of the tool and also pass through aligned slots 78 in a cross plate 80 secured to the tool portion 18 and disposed to overlie the flanges 72a, 72b, whereby lateral sliding movement of the forward end of the magazine assembly is limited. The guideway 34a is maintained in feeding alignment with the drive track 28 by means of a spring-biased latch member 92 which has a notch 104 engaging a forward edge of the leg 70a of the bracket 68a. As the nail pusher 50a approaches its full forward position, a forwardly extending, laterally displaced finger 120a provided on the pusher 50a engages a rearwardly projecting tab 102 on the latch member 92 and, under the action of the feeding springs 48, displaces the latch member, Fig. 7 (not shown). As the last nail is exhausted from the guideway 34a, the pusher 50a moves the latch forwardly and at the same time a biasing spring 108, mounted between the leg 70b of the bracket 68b and a rearwardly extending portion 112 of a side bracket 114 secured to the tool nose-piece 20, automatically shifts the forward end of the magazine assembly in the direction of the arrow 106 so as to bring the guideway 34b into alignment with the drive track 28, Fig. 8 (not shown). The pushers 50a, 50b are provided with handles 122a, 122b which are moved rearwardly for refilling the guideways with new sets of nails after exhaustion of the nails in the magazine assembly.