Firestone Air Springs Catalog - MRO Stop

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Buy Online at http://www.mrostop.com/products/pneumatics/air-springs/firestone-air-springs.html Angular Capability continued These measurements must fall within the guide lines for that particular part. Consider style #22 in the following scissors arrangement: 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: Calculate Force Here Max Ht (Must be ≥ 3.0) Max Ht #22 (Must be ≤ 10.1) Center Ring 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: Customer Must Supply Button Head-Socket Head Cap Screws 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) connecting the two or more Airstrokes MUST BE GUIDED. FAILSAFE 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 vacuum 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 105. 16 Buy Online at www.MROStop.com
Buy Online at http://www.mrostop.com/products/pneumatics/air-springs/firestone-air-springs.html AIRSTROKE PRESSURE (PSIG) INFLATION PRESSURE CHART MAXIMUM RECOMMENDED INTERNAL PRESSURES FOR CONVOLUTED TYPE AIRSTROKE ACTUATOR APPLICATIONS BASED ON APPROXIMATELY 1/3 NORMAL BURST VALUES APPLICATIONS WHICH EXCEED THESE LIMITS SHOULD BE REVIEWED WITH FIRESTONE. CONSTRUCTION BEAD PLATE AND BEAD PLATE AND BEAD RING STYLE ROLLED PLATE STYLE REFER TO EACH INDIVIDUALDATA PAGE FOR MAXIMUM USABLE HEIGHT RESTRICTIONS HIGH STRENGTH TWO PLY BEAD RING STYLE 18 16.5 15 13.5 12 10.5 9 7.5 6 4.5 TRIPLE CONVOLUTED 12 11 10 9 8 7 6 5 4 3 DOUBLE CONVOLUTED 6.5 6 5.5 5 4.5 4 3.5 3 2.5 2 SINGLE CONVOLUTED OVERALL AIRSTROKE HEIGHT (INCHES) 250 200 150 100 50 0 Buy Online at www.MROStop.com 17
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Firestone Air Springs Catalog - MRO Stop

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