. American engineer and railroad journal . arly shown inFigs. 1 and 3. The speed of the pneumatic reversing clutchesmay be varied to some extent by changing the speed ot the mo-tor, and a greater variation may be obtained by the simple re-versing of two change gears. The pneumatic clutches which areshown thoroughly incased are of the Niles-Bement-Pond typewith a large number of friction discs, whereby great frictionarea is obtained in a comparatively small compass. These clutchesare operated by compressed air. A small valve, easily moved byhand, controls the stopping, starting and reversing oi
. American engineer and railroad journal . arly shown inFigs. 1 and 3. The speed of the pneumatic reversing clutchesmay be varied to some extent by changing the speed ot the mo-tor, and a greater variation may be obtained by the simple re-versing of two change gears. The pneumatic clutches which areshown thoroughly incased are of the Niles-Bement-Pond typewith a large number of friction discs, whereby great frictionarea is obtained in a comparatively small compass. These clutchesare operated by compressed air. A small valve, easily moved byhand, controls the stopping, starting and reversing oi the tableand handles satisfactorily the power given out by the largedriving motor. From this point to the rack the drive is, in prac-tically every respect, that which is found on any planer, except,of course, in this instance, it is exceptionally heavy and two bull pinions are forged directly on the shaft, being cuthalf pitch apart, in order to give smoothness of motion. I ■■ IS AMERICAN ENGINEER AND RAILROAD JOURNAL. 75. FIG. 2.—DRIVE FOR THE SLOTTER ATTACHMENTS. An interesting feature is the pneumatic feed. The feed for thecross heads is clearly shown in Fig. 3. On the side of the up-right just above the gearing is a cylinder witha piston rod extending to the left. This rodcarries a rack which meshes into a gear nearthe bottom of the vertical feed shaft. Thisshaft has on its lower end, a bevel gear mesh-ing into another bevel gear on a horizontalshaft, which transmits motion to the verticalfeed shaft on the left-hand upright. Themovement of these feed shafts is constant atall times and variation in amount and direc-tion of head feeds is obtained by adjusting theconnecting rod in the slotted cranks on tneends of the cross slide. These cranks aregraduated in such a way that definite crossand vertical feeds can be obtained, and byusing at the same time the cranks on bothsides an angular feed can be given to the tool,which is at times desirable, as the heads w
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
