MECHANISMS AND MECHANICAL DEVICES 4e
MECHANISMS AND MECHANICAL DEVICES 4e
... common hand tools such as scissors, screwdrivers, wrenches, jacks, and hammers are actually true mechanisms. Moreover, the hands and feet, arms, legs, and jaws of humans qualify as functioning mechanisms ... opposite end, and the opposing effort is exerted on or about the middle. Examples of Class 3 levers are shovel and fishing rod where the hand is the fulcrum, tweezers, and h...
Ngày tải lên: 08/04/2014, 11:36
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... off. Cutoff and transfer devices for glass tubes. The upper part of a rotating glass tube is held by a chuck (not shown). When the cutter cuts the tube to a given length, the mandrel comes down and a spring ... stroke to allow sufficient time for the parts to fall in and out of the sector. Sclater Chapter 3 5/3/01 10:19 AM Page 53 ELEVEN PARTS-HANDLING MECHANISMS 60 Gravity feed for...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... every lobe on gear 4, and T 3 /T 4 = L 3 /L 4 = 2/3, where T 3 and T 4 are the numbers of teeth on gears 3 and 4. T 1 and T 2 will denote the numbers of teeth on gears 1 and 2. Next, select the ... number of lobes L 3 and L 4 on the gears 3 and 4. In the drawings, L 3 = 2 and L 4 = 3. Any two lobes on the two gears (i.e., any two lobes of which one is on one gear and the...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... steel band, or rope around the drum is fastened to the driving and driven members; sprocket-wheels and chain can replace the drum and belt. Fig. 9 Matching gear-segments. Fig. 10 Racks and coupled ... and 4; two-jointed inter- mediate links: links 5 and 7; three jointed intermediate links: link 6. The input motions to be added are a and b; their sum s is equal to c 1 a + c 2 b,...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... ARRANGEMENTS Differential, duplex, and other types of screws can provide slow and fast feeds, minute adjustments, and strong clamping action. Rapid and slow feed. With left- and right-hand threads, slide motion ... apply these devices in the drives of heavy-duty machines by strengthening the springs and other load-bearing members. Overriding spring mechanisms are widely used...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... a wheel. Fig. 1 A standard differential winch consists of two drums, D 1 and D 2 , and a cable or chain which is anchored on both ends and wound clockwise around one drum and counterclockwise ... ROLLER CHAINS AND THEIR ADAPTATIONS Various roller, side-plate and pin configurations for power transmissions, conveying, and elevating. STANDARD ROLLER CHAIN—FOR POWER TRANSMISSION AN...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... motor com- parable in size and power to those used in standard reel-to-reel recorders, and a large bi-peripheral flywheel and sturdy capstan that reduces wow and flutter and drives the tape. A patent ... losses in the gears and bearings and from windage and churning of lubricant. gear power: A gear’s load and speed capacity, determined by gear dimensions and type. Helical...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... Page 310 336 LINKAGES FOR BAND CLUTCHES AND BRAKES Fig. 1 An outside band clutch operated by a roller and cone. Fig. 2 An outside band clutch made as two half wrap bands with an interme- diate ... faster. Edges of the clutch bands carry the entire load, and there is also a compound action of one band upon another. As the torque builds up, each band pushes down on the band beneath it, so...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... clutch plates, gear fingers, and pinned members form the basis of these ingenious mechanisms. Mechanical stops are often required in automatic machinery and servomechanisms to limit shaft rotation ... of machining tolerances and other geometric imperfection of the drive train. Sclater Chapter 10 5/3/01 1:08 PM Page 367 348 MECHANICAL SYSTEMS FOR CONTROLLING TENSION AND SPEED Th...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... simplicity, and cost. Fig. 1 A bimetallic sensor is simple, compact, and precise. Contacts mounted on low-expansion struts determine slow make- and- break action. A shell contracts or expands with ... single-gland type. Automatic wear control compensates for normal wear and maintains volumetric efficiency. This pump will handle 5 to 300 gph without churning or foaming. It needs no lubr...
Ngày tải lên: 22/10/2012, 14:26