Mechanisms and Mechanical Devices Sourcebook - Chapter 12
Mechanisms and Mechanical Devices Sourcebook - Chapter 12
... mechanismare in coupling devices for load-carrying carts or trucks,hooks or pick-up attachments for cranes, and quick-releasemechanisms for remotely controlled manipulators.Sclater Chapter 12 5/3/01 1:24 ... Chapter 12 5/3/01 1:25 PM Page 414415Sclater Chapter 12 5/3/01 1:25 PM Page 415416DETENTS FOR STOPPING MECHANICAL MOVEMENTSSome of the more robust and practical devices for stopping mechanical ... of the follow-ing parts (see figure):• An eye on a shank with internal left-handedthreads,• An eye on a shank with external right-handed threads, and A flanged collar with left-handed externalthreads...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... CHAPTER 3PARTS-HANDLINGMECHANISMSSclater Chapter 3 5/3/01 10:19 AM Page 515 2MECHANISMS THAT SORT, FEED,OR WEIGHORIENTING DEVICESHere’s a common problem; Parts arrive in either open-end ... movement, andthe top disk provides the up -and- down force necessary for thecutting action.This four-bar linkagewith an extended couplercan cut a web on the runat high speeds. The four-bar linkage ... The feed can be contin-uos or as required.A rotary screw-feed handlesscrews, headed pings, shoulderedshafts, and similar parts in mosthopper feeds, random selection ofchance-oriented parts calls...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... smoothness and flexibil-ity in converting constant rotary motioninto a start -and- stop type of indexing.It works equally well for high-speedoperations, as fast as 2 seconds per cycle,including index and ... favorablehigh-speed characteristics for stop -and- go mechanisms isr3= R3The profile defined by this equationhas, among other properties, the charac-teristic that, at transition from rest tomotion and vice ... during jam-ups.• Its built-in anti-backlash gear systemaverts rebound effects, play, and lostmotion during stops.How it works. Input from a singlemotor drives an eccentric disk and con-necting...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... CHAPTER 5SPECIAL-PURPOSEMECHANISMSSclater Chapter 5 5/3/01 11:45 AM Page 127 128 NINE DIFFERENT BALL SLIDES FOR LINEAR MOTIONFig. 1 V-grooves and flat surface make a ... tilting and uncertaintyin the distance between the plates). Otherprior mechanisms relied on spring load-ing, differential multiple-point drives andother devices to reduce backlash. In pro-viding ... inven-tors include Evans, Tchebicheff, Roberts ,and Scott-Russell.Four-bar arrangement. Like othermechanisms that aim at straight-linemotion, the Daniel design is based on thecommon four-bar linkage....
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Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... A standard rotat-ing-air fitting is required.Reciprocating linear force link: It recipro-cates with one-, two-, or three-convolutionair springs in a back-to-back arrangement.Two- and three-convolution ... cor-ner. The result is less fatigue and longer life.Sclater Chapter 6 5/3/01 12: 24 PM Page 178OVERRIDING SPRING MECHANISMS FORLOW-TORQUE DRIVESFig. 1 Unidirectional override. The take-off ... stictionless and neg-ligible hysteresis characteristics. Thebearing is radiation-resistant and can beused in high vacuum conditions or inenvironments where there is dirt andcontamination.185TAUT BANDS AND...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... 5/3/01 12: 33 PM Page 212 213SIXTEEN LATCH, TOGGLE, AND TRIGGER DEVICESDiagrams of basic latching and quick-release mechanisms. Fig. 1 Cam-guided latch (A) hasone cocked, and two relaxed posi-tions, ... composedof circular arc 1-2 with center at 02, arc 3-4 with center at 03, arc 4-5 with center at01, arc 5-6 with center at 04, arc 7-1 withcenter at 01, and the straight lines 2-3 and6 -7 . The method calls ... frequentlyemployed in automatic-feed mechanismsand screw machines They are the circular,constant-velocity, simple-harmonic,cycloidal, modified cycloidal, and circu-lar-arc cam curve, presented in...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... CHAPTER 8GEARED SYSTEMS ANDVARIABLE-SPEEDMECHANISMSSclater Chapter 8 5/3/01 12: 42 PM Page 241Gears are versatile mechanical components capable of per-forming many different ... which control radial position andtherefore control the orbit. Ring and sundisks are spring-loaded.DISK DRIVESSclater Chapter 8 5/3/01 12: 42 PM Page 247248Ring -and- pulley drive (Fig. 9). Athick ... PM Page 248249Sphere -and- disk drives (Figs. 12 and1 3).The speed variations in the driveshown in Fig. 12 are obtained by chang-ing the angle that the rollers make in con-tacting spherical disks....
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Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... Rzappa-type jointto get the desired effect.Ball -and- socket. Basically, the True-Speed joint is a system of ball -and- socket connections with large contactareas (low unit pressure) to transmit tor-sional ... ofMIL-E-5400, class 3 and MILK-3926specifications.Applications were seen in counter andreset switches and controls for machinesand machine tools, radar systems, andprecision potentiometers.Eight-Joint ... slip-spring coupling. Fig. 6 An internal ratchet and spring-loaded pawls. Fig. 7 A one-way dog clutch.Sclater Chapter 9 5/3/01 12: 57 PM Page 311312SPRING-LOADED PINS AID SPRAGS IN ONE-WAY...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... warning light and second tolight a red bulb and also sound an alarmbell.Over-the-side or over-the-rear loadingrequires a different setting of theBourdon pressure-gage unit than doesover-the-front loading. ... signal devices. The load plunger and the swaged-on cable termina-tion have ball -and- socket seat sections to permitmaximum free cable movement, reducing the possi-bility of fatigue failure. A split-coupling ... CHAPTER 10TORQUE-LIMITING,TENSIONING, ANDGOVERNING DEVICESSclater Chapter 10 5/3/01 1:07 PM Page 339340CALIPER BRAKESHELP MAINTAINPROPER TENSIONIN PRESS FEEDA simple cam -and- linkage...
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Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... steel, monel, andbronze for handling acids, oils, and sol-vents. The impeller is made of pressure-vulcanized laminated layers of Hycar, 85 to90 percent hard. Sand, grit, scale andfibrous materials ... to a minimum. Thisheavy-duty gear pump can be used at pressures up to 1,000 psi.These pumps were made with either single- or double-endshafts and can be foot- or flange-mounted. The drive shaftentrance ... wear. In oper-ation, the tip of the bucket is in light con-tact with the casing wall. Liquids aremoved by sucking and pushing actionsand are not churned or foamed.4. HIGH-PRESSURE, high-volume pumps...
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