assistive and protective devices
Mechanisms and Mechanical Devices Sourcebook - Chapter 3
... 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 ... APPLICATIONS Viscous liquid adhesives are used to glue fabrics and paper, apply paper labels, make cardboard and wooden boxes and shoes, and bind books Specially designed machines are required if ... strike and rest on pin Pin now moves into the passage way, and if the bottom of the “U” is facing to the right, the pin would kick over the part as shown by the dotted lines If, on the other hand,...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 4
... 4, and T3/T4 = L3/L4 = 2/3, where T3 and T4 are the numbers of teeth on gears and T1 and T2 will denote the numbers of teeth on gears and 98 and S = ∆θ 3/θ30 Hence θ30(1 + S)L3 = 360º For S = and ... = r4 and r2 = r3, there is no “differential motion” and the output remains stationary Thus if one gear pair, say and 4, is made partly circular and partly noncircular, then where r2 = r3 and r1 ... pulleys, and linkages (see drawing) instead of the usual genevas or cams is capable of cyclic start -and- stop motions with smooth acceleration and deceleration Developed by Eric S Buhayar and Eugene...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 5
... 11:45 AM Page 134 TWELVE EXPANDING AND CONTRACTING DEVICES Parallel bars, telescoping slides, and other devices that can spark answers to many design problems Figs and Expanding grilles are often ... Dynamic and static balancing is simplified when an expanding wheel is attached to a nonexpanding main wheel As a pulley, an expanding wheel can have a steel band fastened to only one section and ... 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 GEARS Fig Matching gear-segments Fig 10 Racks and coupled...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 6
... Bearing adjustment This screw arrangement is a handy way for providing bearing adjustment and overload protection Rapid and slow feed With left- and right-hand threads, slide motion with the nut locked ... 0.4—A linear spring rate and high load resistance with small deflections For height to spring ratios between 0.8 and 1.0—An almost linear spring rate for fasteners and bearing and in stacks For rations ... bearings—such as the ball and roller bearings and of sliding bearings—which include sleeve and hydrostatic bearings Neither rolling nor sliding, flexures simply cross-suspend a part and flex to allow...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 7
... equations of motion Fig A standard differential winch consists of two drums, D1 and D , and a cable or chain which is anchored on both ends and wound clockwise around one drum and counterclockwise around ... ROLLER CHAINS AND THEIR ADAPTATIONS Various roller, side-plate and pin configurations for power transmissions, conveying, and elevating STANDARD ROLLER CHAIN—FOR POWER TRANSMISSION AND CONVEYING ... generating (A) modified cycloidal curves, and (B) basic cycloidal curves true cycloidal This is done by a second steel-band arrangement As carriage I moves, bands and cause the eccentric to rotate Because...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 8
... power 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 and helical-type gears ... motor comparable 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 ... manufacturing and alignment and (2) thermal and vibrational changes in the sizes and positions of the meshing components One of the benefits is a reduction of gear-toothcontact noise and vibration...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 9
... bi-directional slip and independent torque capacities for the two directions of rotation It requires two springs, one right-handed and one left-handed, for coupling the input, intermediate and output ... 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 each ... requirements of MIL-E-5400, class and MILK-3926 specifications Applications were seen in counter and reset switches and controls for machines and machine tools, radar systems, and precision potentiometers...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 10
... between the pin and the rotating finger must be shorter than the thread pitch so the pin can clear the finger on the first reverse-turn The rubber ring and grommet lessen the impact and provide a ... FIG 2—SECONDARY INDICATORS FIG 3—CONTROLLERS AND ACTUATORS 348 lines, textile processing equipment, paper machines, rubber and plastic processers, and printing presses In each of these examples, ... between the indicator and the actuating drive However, the force amplification between the indicator and the drive is rel- 349 Sclater Chapter 10 5/3/01 1:07 PM Page 350 Speed and Tension Control...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 11
... completely encased and cannot expand beyond its original diameter The standard pump is made of bronze and will handle volumes to 15 gpm The Squeegee develops a vacuum of 25 in of mercury and will work ... sucking and pushing actions and are not churned or foamed 370 PUMPING ACTION is produced by the meshing of the idler and rotor teeth in this rotary pump The idler is pinmounted to the head and the ... single-gland type Automatic wear control compensates for normal wear and maintains volumetric efficiency This pump will handle to 300 gph without churning or foaming It needs no lubrication and operates...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 13
... opposite sense to ψ14, ψ13 and ψ12 This establishes points A′2, A′3 and A′4, but here A′3 and A′4 coincide because of symmetry of A3 and A4 about A0B0 Draw lines A1A′2 and A1A′4, and the perpendicular ... way For example, in Fig two angular motions, φ12 and φ13, must be synchronized with two others, ψ12 and ψ13, about the given pivot points A0 and B0 and the given crank length A0A This means that ... will coordinate angular motions φ12 and φ13 with ψ12 and ψ13 The procedure is: Fig Four-bar linkage synchronizes two angular movements, φ12 and φ13, with ψ12, and ψ14 Obtain point A′2 by revolving...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 14
... elements and icons, and 2D drafting and detailing capability, which support design collaboration and compatibility among CAD, CAM, and computer-aided engineering (CAE) applications Designers and engineers ... ADI developed and marketed these accelerometer chips, demonstrating its capability and verifying commercial demand Initially ADI built these devices by interleaving, combining, and customizing ... datums, and section lines • Automated geometric dimensioning and tolerancing (GD&T) • Symbol creation, including those for weld and surface finish, with real-time edit or move capability and leaders...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 15
... and edited the Second Edition of Mechanisms and Mechanical Devices Sourcebook after the death of Mr Chironis The late Nicholas P Chironis developed the concept for Mechanisms and Mechanical Devices ... engineer in the military/aerospace industry and a Boston engineering consulting firm before changing his career path to writing and editing on electronics and electromechanical subjects He was a ... and newspapers on various topics in engineering and industrial marketing Mr Sclater holds degrees from Brown University and Northeastern University, and he has completed graduate courses in industrial...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 12
... left-handed threads, • An eye on a shank with external righthanded threads, and • A flanged collar with left-handed external threads to mate with the shank of the firstmentioned eye, and right-handed ... connectors In step 5, the handle is pushed upward an additional 15º, locking the handle cam and the slide In step 6, the handle is rotated an additional 30º, forcing the box and the mating spring-loaded ... the handle and retention cams as the box is moved rearward and downward 409 Sclater Chapter 12 5/3/01 1:24 PM Page 410 Perpendicular-Force Latch (continued ) dle has been installed on the handle...
Ngày tải lên: 22/10/2012, 14:26
Mechanisms and Mechanical Devices Sourcebook - Chapter 16
... angular-momentum-balanced, robot ball -and- cone ball -and- disk, and ball -and- screw bearings and roller belt belt -and- chain, variable speed cam for machine tools for tool-slide mechanism two-directional rack -and- gear Links ... adjustable ball, and belt general Graham electrically-coupled planetary ring, and roller, and two curve-slider differential fixed general robot disk adjustable and roller ball, and general planetary ... ring and slider, Jenson’s robot rocker arm and disk roller-dwell rotary, short-dwell rotary-to-reciprocating motion and dwell rotary pump rotating crank screw screw, double-handed sector, rack -and- gear...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 17
... pump, steam engine, and chronometer, to the cotton gin, and airplane were invented by self-trained engineers, scientists, and technicians By themselves, many of the mechanisms and devices described ... machine design instructors at the college and vocational school level, amateur and professional inventors, and students of all of the engineering disciplines and physical sciences Last but not least, ... anonymous artisans, millwrights, instrument makers, and mechanics over the past centuries They left behind the sketches, formal drawings, and even the working models on which many of the illustrations...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 18
... Pneumatic, Hydraulic, and Electric Governors Speed Control Devices for Mechanisms Floating-Pinion Torque Splitter CHAPTER 11 PNEUMATIC AND HYDRAULIC MACHINE AND MECHANISM CONTROL Designs and Operating ... Straddle Design of Spiral Bevel and Hypoid Gears CHAPTER COUPLING, CLUTCHING, AND BRAKING DEVICES Coupling of Parallel Shafts Novel Linkage Couples Offset Shafts Disk -and- Link Coupling Simplifies ... Indicators and Controllers Instant Muscle With Pyrotechnic Power CHAPTER 12 FASTENING, LATCHING, CLAMPING, AND CHUCKING DEVICES Remotely Controlled Latch Toggle Fastener Inserts, Locks, and Releases...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 1
... place and remove parts from annealing furnaces and punch presses, and they assemble and test electrical and mechanical products Benchtop robots pick and place electronic components on circuit boards ... floor-standing, 6-axis, heavy-duty robots with reaches of between and 10 ft, (2.5 and 3.0 m) and maximum payloads of 441 to 880 lb (200 to 400 kg) S-900i robots can perform such tasks as materials handling ... precision gear drives All process and application cables are routed through the arm, and there are brakes on all axes S-900i robots support standard I/O networks and have standard Ethernet ports Process-specific...
Ngày tải lên: 22/10/2012, 14:27
Mechanisms and Mechanical Devices Sourcebook - Chapter 2
... positioning antenna reflectors, opening and closing security gates, handling materials, and raising and lowering scissors-type lift tables, machine hoods, and light-duty jib crane arms Other linear ... input command for the desired output and the measured actual output • In integral control the signal driving the motor equals the time integral of the difference between the input command and the ... capabilities, the number of input/output (I/O) ports required, and the need for such features as linear and circular interpolation and electronic gearing and camming In general, a motion controller receives...
Ngày tải lên: 22/10/2012, 14:27
Reporting with Web Services and Mobile Devices.
... WEB SERVICES AND MOBILE DEVICES //declare connection, command and other related objects SqlConnection conReport = new SqlConnection(cnString); SqlCommand cmdReport = new SqlCommand(); SqlDataReader ... reader and populate the dataset cmdReport.CommandType = CommandType.Text; cmdReport.Connection = conReport; cmdReport.CommandText = "Select TOP * FROM Dbo Itinerary"; //read data from command object ... mobile devices These devices are evolving and getting smarter with every passing day Now, users can go wireless and still have access to all their corporate resources, such as e-mail, databases, and...
Ngày tải lên: 05/10/2013, 08:48
Robot Mechanisms and Mechanical Devices Illustrated P2
... the required task, and design the manipulator and end effector to be only as complex as will accomplish that task Trial and error is the best method in many fields of design, and is especially ... often, and test everything Mobile robots are inherently complex devices with many interactions within themselves and with their environment The result of the effort, though, is exciting, fun, and ... input command for the desired output and the measured actual output • In integral control the signal driving the motor equals the time integral of the difference between the input command and the...
Ngày tải lên: 17/10/2013, 10:15