. The railroad and engineering journal . ^ SINGLE-ACTING 5-TON HAMMER, FIVES-LILLE COMPANY. Where the frame is single or not open at the bottom, thesedovetails are necessarily in line with each other, becauseit would be imposbible to drive keys for them other-wise. The form of the hammer-block and the guides on it is plates and angles, may be made of as simple form as pos-sible. The form No. i is the best, because it presentsgreater resistance and gives the hammer-block the great-est possible width, which is always a great advantage, aswill be readily seen. Vol. LXII, No. 9.] ENGINEERING
. The railroad and engineering journal . ^ SINGLE-ACTING 5-TON HAMMER, FIVES-LILLE COMPANY. Where the frame is single or not open at the bottom, thesedovetails are necessarily in line with each other, becauseit would be imposbible to drive keys for them other-wise. The form of the hammer-block and the guides on it is plates and angles, may be made of as simple form as pos-sible. The form No. i is the best, because it presentsgreater resistance and gives the hammer-block the great-est possible width, which is always a great advantage, aswill be readily seen. Vol. LXII, No. 9.] ENGINEERING JOURNAL. 405 CHAPTER DOGS OR CATCHES. All heavy hammers should be provided with holdingdogs or catches, intended to keep the hammer in positionwhen any one is working below, and especially when theshoes or dies are being changed ; this arrangement insures. ^J- f6. complete safety to the machinist charged with the workbelow, and also saves steam, as it prevents leakage throughthe piston when the changes take some time. Catches working vertically seem to me to fulfill their ob-ject much better than those working horizontally, consid-ering the ease with which they can be operated ; more-over, the strain upon them is that of compression and nota transverse strain. In the lo-ton or smaller hammers a single catch is usuallysufficient ; beyond that weight it is better to employ two,which are held together by cranks so that they can beworked at the same time. These catches should be so arranged that the hammer-man may be able to work them, by means of a foot-leveror a hand-lever. For large hammers the foot-lever is pref-erable because it leaves both the hammermans hands freeto work the valves, and moreover there is not likely to beany confusion in working the levers. The catch is fixed upon a horizontal shaft or axis, whichis moved by an interm
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Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
