. Canadian foundryman (1921). d pull of the spring-balancedhandle which is shown beneath the topmember of the machine frame. This mo-tion is more natural, easy and decidedlyless fatiguing then an up-and-down armor pedal stroke. It calls into use theshoulder and biceps muscles rather thanleg, hip and back muscles as formerly. By the introduction of a long up-right tensicn spring at each side of themachine. e?.ch spring adjustable by athreaded crank at the top, the cradleand flask load are held in suspensionthree or four inches above the joltingpads. A sensitive arrangement of piv-oted arms conn
. Canadian foundryman (1921). d pull of the spring-balancedhandle which is shown beneath the topmember of the machine frame. This mo-tion is more natural, easy and decidedlyless fatiguing then an up-and-down armor pedal stroke. It calls into use theshoulder and biceps muscles rather thanleg, hip and back muscles as formerly. By the introduction of a long up-right tensicn spring at each side of themachine. e?.ch spring adjustable by athreaded crank at the top, the cradleand flask load are held in suspensionthree or four inches above the joltingpads. A sensitive arrangement of piv-oted arms connects the jolting hand?with the cradle-lifting arms by way ofthe pattern drawing lever, thereby im-parting the jolting motion. A forward pull of the handle bringsthe cradle down sharply upon the pads,causing it to rebound for the nextstroke. By successive pulls of the handleas many jolts as desired are given. Asmuch or as little impetus as the oper-ator wishes may be put into the fact that the loaded cradle is in a. state of equilibrium, by reason of thesprings, makes the jolting operation re-markably elastic and not at all fatigu-ing. The cradle has a motion of fourand a half to five inches vertical travelin jolting. Following is an outline of the succes-sion of operations in making a mold onthis machine: 1. Attach mounted patterns tocradle, both cope and drag. 2. Place flasks, permanent or s-nap,upon the pattern mounts. 3. Fill flasks with sand. 4. Adjust the horizontal and uprightsprings, as per instructions, until theloaded cradle is suspended 3Vz or 4inches above the jolting pads. (This isdone only when changing patterns). 5. Jolt as described, using the upperjolting handle. In most cases no handlamming or tucking is necessary. 6. Strike off. Place bottom and copeplates, and apply clamp. 7. Raise cradle to allow it to rollover. 8. Apply compression by depressingthe long squeeze lever; this also aut -matically releases the clamp. 9. Draw the pattern by smoothlyra
Size: 1158px × 2158px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
