Firestone EMDG198 Horizontal Misalignment, Design Envelope, Stacking, Fail Safe Devices, Vacuum

Page 16

Angular Capability continued

These measurements must fall within the guide lines for that particular part. Consider style #22 in the following scissors arrangement:

Calculate

 

 

 

Force Here

 

 

Max Ht

Max Ht

 

#22

(Must be 10.1)

(Must be

3.0)

 

 

 

Pivot

 

 

 

Point

 

 

 

Reversible sleeve Type 1T parts may also stroke through an arc. In this case, care must be taken to prevent the bellows from rubbing (internally) against itself where it rolls over the piston:

Bellows must

not rub against

itself here.

HORIZONTAL MISALIGNMENT

The upper and lower bead plate centers (or mounting plate centers in the case of a bead ring type attachment) may be out of line somewhat without injury to the bellows. Our “rule of thumb” for convoluted type Airstrokes is one inch misalignment allowed per convolution. So, a single convoluted air spring may be out of line by as much as 1 inch, a double by 2 inches, and a triple convoluted air spring by 3 inches.

DESIGN ENVELOPE

Adequate clearance should be provided around the Airstroke to prevent puncturing or rubbing of the bellows. The maximum diameter @ 100 psig for each Airstroke (bellows) is located just above the cross-sectional view of the air spring.

STACKING

It is permissible to stack Airstrokes (one on top of another) to increase stroke; however, the center plate (or plates) connect- ing the two or more Airstrokes MUST BE GUIDED.

Please note that the air spring forces are not additive in this configuration. A method for guiding, which also illustrates one center ring concept for mounting the two parts together at the middle, is illustrated below:

Center Ring

Customer Must

Supply Button

Head-Socket Head

Cap Screws

FAIL SAFE DEVICES

Some applications require the use of fail safe mechanisms (such as a mechanical lock-out on a scissors lift) to prevent damage or injury in the event of an air system failure.

VACUUM

An Airstroke can withstand a small amount of vacuum without injury to the bellows. The maximum amount of acceptable vacu- um is dependent upon the bellows’ size, the height in use, and whether it is a two ply or high strength (fabric) air spring. (A high strength Airstroke bellows has a “stiffer” wall than a two ply; therefore, it is less susceptible to dimpling and deformation inward). It is generally best to use only single convoluted air springs under vacuum.

An Airstroke Design Parameter Worksheet can be found on page 103.

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Contents Irmount R Table of Contents IntroductionAdvantages of Firestone Airstroke Actuators Advantages of Firestone Airmount Isolators AIR Spring Bellows ConstructionConvoluted AIR Springs END Closure OptionsReversible Sleeve AIR Springs 16 UNC To Air Supply Blind Nut Deep Tightening Torque On the blind nut 15 to 20 ft.-lbsUNC Thread Firestone Attach the air spring, a Stud Adapter is available fromSteel Bead Rings Nuts and Lockwashers are included withLarge Parts with Aluminum Bead Rings Installation MaterialStandard Bolt Length 16-24 UNFLarge Convoluted AIR Springs 9mmHOW to USE Static Data Chart Airstroke Actuation752 180 349Airmount Isolation Internal Rubber BumpersTemperature MediaPressure ContaminatesAirstroke Actuation SelectionDown and UP Stops ReturnHorizontal Misalignment Design EnvelopeStacking Fail Safe DevicesStyle TE StyleAirstroke Actuator Problem Solvers Forming Press Vertical Actuated Drive Table Scissor Lift Airmount Vibration Isolation Selection and Isolation FormulaDynamic Spring Rate Formula Natural Frequency FormulaLateral Rates and Stability Center of GravityHeight Lateral Rate Vertical Rate Safety Stops Initial InstallationIsolating AN Unbalanced Mass LOW Pressure OperationPlumbing Systems DampingDescription Order No Resonance Isolation Chart Hertz CPMPercent Airmount Isolation Problem Solvers Airmount Isolation Problem Solvers Miscellaneous Applications Miscellaneous Problem Solvers Miscellaneous Problem Solvers 450 400 600 500470 410 360 10.8Type 1 bead plate Type 2 bead plateType 3 bead plate Type 4 bead ring Type 5 rolled plateDynamic Characteristics at 2.5 in. Design Height 1M1AShaded area without Consulting FirestoneDescription 1M1A-1Static Data 2M1A Style NPT, each end 2M1A Plastic studs WO2-358-3002Ply Brass studs WO2-358-3004 Throughout the strokeStyle Blind nut,1/8 NPT 2M2A Plastic studs WO2-358-3008 2M2APsig Style Blind nuts, 1/4 NPT Blind nuts, 3/4 NPT NPT only upper plateBlind nuts lower plate Rubber bellows onlyShaded area 25 lbsStyle Blind nuts, 1/4 NPT 131 Blind nuts, 3/4 NPT 13132 lbs WO1-358-0112 110Rubber bellows only WO1-358-0100 Strength 116WO1-358-7606 Dynamic Characteristics at 5.5 in. Design Height 116-1Area without Consulting Firestone 37 lbsVolume 115WO1-358-7023 Dynamic Characteristics at 5.0 in. Design HeightRubber bellows only WO1-358-0134 Style Blind nuts, 1/4 NPT WO1-358-7040 19-.75 19-.7510.0 lbs 113 14.5 lbsStyle Blind nuts, 3/4 NPT WO1-358-8160 128-1 High Strength 113-115.2 lbs 17.1 lbs Dynamic Characteristics at 6.0 in. Design HeightFrequency Do not use Airstroke 11913.2 lbs Static Data Description Able with rolled plates. See page 11 for explanation126 Rolled Plate Assembly PlyBellows Blind nuts, 3/4 NPT WO1-358-7726 WO1-358-0147 Rubber bellows only High Strength24.5 lbs 148-1 This bead ringNo blind nuts Ply NPT both endsNo girdle hoop 255-1.5 50 lbsDynamic Characteristics at 6.5 in. Design Height 224Able with bead rings. See pages 8-10 for explanation 14 lbsStyle Blind nuts, 1/4 NPT WO1-358-7325 Blind nuts, 3/4 NPT WO1-358-7327Rubber bellows only WO1-358-0142 Shaded area without Consulting FirestoneDynamic Characteristics at 8.5 in. Design Height X10020-2 UseDynamic Characteristics at 9.5 in. Design Height Dynamic Characteristics at 10.5 in. Design Height 22-1.5Style Blind nuts, 1/4 NPT WO1-358-7444 22-1.5 12.9 lbs100x 21-2 Minimum heightDynamic Characteristics at 11.25 in. Design Height 233-2Style Blind nuts, 1/4 NPT 233-2 Blind nuts, 1/4 NPT Two Rubber bumperStyle Two Ply Bellows 19.0 lbs203 Style Ribbed neck aluminum bead 203 Rings equal spacing8 bolts, nuts, washers WO1-358-7227 Ribbed neck aluminum bead PlyRubber bellows only WO1-139-0207 WO1-358-723928.8 lbs 200 Style200 Rings equal spacing WO1-358-7775215 Style Ribbed neck aluminum bead215 Rings equal spacing WO1-358-7301 Ribbed neck aluminum bead BellowsBead ring Dynamic Characteristics at 11.0 in. Design Height 248-272.5 lbs Force to collapse to minimum height @ 0 PSIG.... lbs352 Dynamic Characteristics at 13.5 in. Design Height20.3 lbs Dynamic Characteristics at 13.0 in. Design Height 313Style Blind nuts, 1/4 NPT 313 46 lbsDynamic Characteristics at 14.70 in. Design Height 333WO1-358-7760 312WO1-358-8004 Rubber bellows only WO1-358-7921 323Do not Dynamic Characteristics at 14.0 in. Design Height 320Rubber bellows only WO1-358-0987 WithoutDynamic Characteristics at 15.0 in. Design Height 321WO1-358-7306 Rubber bellows only WO1-358-7919348-3 Style Thin wall assembly 1X84D-1 Without cap WO1-358-9188 Dynamic Characteristics at 8.0 in. Design Height1X84D With cap dotted line WO1-358-91904001 Style Blind nut, 1/8 NPT WO2-358-40017002 Style Blind nut, 1/8 NPT WO2-358-70027010 Style Blind nut, 1/8 NPT WO2-358-70107012 Style Blind nut, 1/8 NPT WO2-358-7012Ring bolts, nuts, washers not 1T12E-3Ply Included, use cap screws WO1-358-8118 1T14C-1 Style Blind nuts, 1/4 NPT WO1-358-5405 1T14C-3 1T14C-3Than 10 Psig internal pressure 1T14C-7 Style Blind nuts, 1/4 NPT WO1-358-5743 1T28C-7 High StrengthDynamic Characteristics at 7.0 in. Design Height 10.4 lbs1T15S 13.7 lbsStyle Blind nuts, 1/4 NPT WO1-358-9414 1T15L-4 15.5 lbsDynamic Characteristics at 7.5 in. Design Height Static DataAvailable with a bead ring. Bolts are not included 140WO1-358-9053 Two Blind nuts, 3/4 NPT WO1-358-9054 1T15M-2WO1-358-9099 1T15M Dynamic Characteristics at 12.5 in. Design Height14.3 lbs Assembly weight bead plate version, no bumper .... .7 lbs Blind nuts, 3/4 NPT piston Not included WO1-358-073018.0 lbs Style Blind nuts, 1/4 NPT WO1-358-9148 1T19L-7 Blind nuts, 1/4 NPT, bumper WO1-358-9149Blind nuts, 3/4 NPT WO1-358-9172 Ply Blind nuts, 3/4 NPT, bumper WO1-358-91601T19L 22.6 lbsIndex Airstroke Actuator Design Parameter Worksheet Airmount Isolator Design Parameter Worksheet For Vibration IsolationAirstroke