Patent GB-641401-A (GB)
Title: Riveting machine for car roof construction
IPC: B21J15/20
Filed: 1948-07-03
Abstract: 641,401. Riveting. CHICAGO PNEUMATIC TOOL CO. July 3, 1948, No. 17949. Convention date, Aug. 19, 1947. [Class 83 (iv)] A riveting-machine for car roof construction comprising an upper frame carrying a series of dollies arranged to engage the top of the work along an arcin a vertical plane, a lower frame having an arcuate track and a carrier movably mounted on the track and adapted to support a riveting-tool in alignment successively with individual dollies. The machine is designed for setting a transverse row of rivets R for joining sheets such as A, B and supporting angles C for forming the curved roof structure of a railway coach. The lower fixed part of the machine comprises two spaced vertical plates 28, Figs. 3 and 6, boltedto supporting standards 33 and formed with the upper edges of arcuate form and reinforced with arcuate angle irons 38 to support tracks 41 for one or more travelling supports for riveting- tools. An upper frame comprising a single vertical plate 42 reinforced by vertical angleirons 45, gusset plates 52 and arcuate angle plates 47 carries a dolly-supporting strip 178 and dollies 26 and is supported by vertical members adapted to slide between the vertical supporting members of the lower frame and to be movable vertically by eccentric cam means controlled by a handle 78 between a lower position as shown in which the dollies are in rivet-setting position, to an upper inoperative position. Each carriage comprises a body 90 with a part 94 projecting down between the tracks 41 and bearing on the edges thereof so as accurately to align the carriage which is supported at each corner by a roller carried by members 107 slidable within bores in the body. Normally the rollers are pressed down by springs 106 so that the body is lifted above the track as shown at 104. Twc of the rollers bear on the outer edges of the tracks 41 while the other two move along the inner edge which is formed with depressions 103 with which the rolls engage in order to align the riveting tool with successive dollies. The operator moves the carriage along the tract manually by means of a handle 188 which contains a switch for initiating the supply of oil for operating the riveting-tool, comprising a set 25 mounted in a holder 127 slidable in a sleeve 136 secured to the carriage body. A reduced extension 141 of the holder is secured within a piston 144 operating within a cylinder 134 bolted to the carriage. Fluid under high pressure may be supplied below the piston to effect the setting of a rivet and at a lower pressure above the piston to effect a withdrawal of the tool after riveting. Surrounding the upper part of the holder and having a pin-andslot connection therewith is a pressure-ring 130 adapted to clamp the work against the dolly under the action of a spring 131. The dollysupporting strip 178 is machined to form a series of apertures 179 each having a counterbore 181 within which is a nut 182 with an elongated extension 184 lying in a longitudinal groove 175 so as to prevent the rotation of the nut, into which is screwed a holder 186 for a dolly 26. Both in front of and behind the riveting- machine, the work is carried by roller conveyers comprising horizontal rollers 159 and vertical rollers 163 which support the work at each side as shown in Fig. 6. The plates such as A and B and the reinforcing cycles C are first assembled as required and held together by a few bolts and moved along the conveyer to the riveting- machine. Just before a joint reaches the riveting-position, the bolts are moved and rivets inserted, whereupon the work is fed forward so that the rivet heads are engaged by the dollies. Two or more operators then actuate the carriages and riveting-tools to set the rivets and the rivet tools and the dollies are moved clear of the work which can then be fed forward for the next row of rivets to be set.