Gas Springs Aid Heavy Lifting – How to Use Them Effectively For Movement of Large Objects

August 24th, 2010

Gas springs are manufactured in different forms including mechanical and compressed. Compression springs are an ideal solution for movement of large and awkward sized objects. They work by lifting the object and then you are able to lower it and position it correctly. This is all done safely and this is a proven and tested method of lifting large objects.

The springs are versatile as they can be used to control aspects of movement in other objects including lids, hoods, flaps and safety guards. The gas springs are attached and then it is able to control the lifting and lowering motions, just like with the large objects.

They operate in such a way that the pressure tube, piston rod and associated fittings are filled with compressed nitrogen. This delivers equal pressure to various areas of the piston. A force is produced which can be easily measured physically. It is then released when the appropriate filling pressure is selected.

Another type of motion control are industrial shock absorbers which decelerate quickly without recoiling or bouncing back. You should look for industrial shock absorbers which are compliant with the highest quality standards and are maintenance free. The sealing technology incorporated into the product ensures accelerated performance and an intuitive design. Some shock absorbers have the added advantage that they reduce noise pollution dramatically. These are not to be confused with automotive shock absorbers.

The gas springs have different end fittings which include clevis forks, swivel eyes and ball joints. These are available in stainless steel and can match all model sizes. Our springs can be used on an extensive range of applications to control the lift and lowering of loads.

All gas springs are effective due to their corrosion resistant and magnetic free elements. This makes them a popular choice for use within the medical, food, industry and marine applications.

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How to Calculate Gas Spring Load

August 22nd, 2010

The unique advantage of gas springs over classic tension and compression coil springs is that their rated force remains constant over their entire stroke length. This is because the force exerted by the gas pressure is imposed only on the area of the piston rod and not the piston. Total interior gas volume remains relatively constant, since it is independent of which side of the piston the volume is located. Calculating the load requires a knowledge of the weight being lifted and its angular motion.

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Design Considerations For a Gas Spring

August 20th, 2010

While gas springs and hydraulic dampers, specialized types of springs that utilize gas under compression to exert force, are produced in various sizes and lengths, selecting one depends on two main factors, the required spring force and the effective stroke of the spring. Application design considerations of the gas springs involves selecting springs with the right sized cylinder and piston based on the force required for the application. For example, the trunk lid of a car is supported by two gas springs on either side of the lid, which when compressed produce a force that is roughly equivalent to the weight of the lid. Similarly for an office chair, the force produced by the gas lift should be a little higher than the weight of the chair, allowing the user to effortlessly move the chair up and down. Furthermore, to prevent buckling the buckling of the gas springs, the force produced should always be in line with its centerline, particularly for a slender gas spring device.

Another factor to consider while selecting or designing a gas spring is the ambient operating temperature, as both extreme hot and cold temperatures affect the operation. The change in temperature affects the pressure that a gas spring can exert and consequently the output force. At very high temperatures, the seal permeability increases and gas molecules may escape through the seal more easily. They are also designed based on the performance guidelines that include cold closing and opening efforts, hot closing and opening efforts, self-rise and self-close angle, hump, room temperature, and damping.

Resistance to dents, damage, and abrasion should also be ensured while designing the cylinder and the piston. Special features, such as external locking and variable damping, should also be considered. Safety is another major factor that should be considered while producing gas springs. As a part of this factor, the suitability of the spring and the mounting position strength are taken into consideration. In addition, a secondary locking mechanism may also be incorporated for safety purposes, if required.

While mounting a gas spring, care should be taken to ensure that they are mounted in an upright fashion with the piston rod pointed downwards. This is to ensure that the rod seal is kept lubricated at all times. If the spring is to be mounted at an angle, care should be taken to ensure that the level of the lubricating oil is sufficient for the rod seal to be always lubricated during the operation.

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How Gas Springs Work

August 19th, 2010

Gas Springs are Mechanical Systems

  • In their most basic form, gas springs are essential simple mechanical systems. The main components of a gas spring—rods, pistons, tubes and gas—interact with one another to absorb shocks and jolts. Gas springs are also closed systems, as the gas used to absorb impacts is completely contained within the shock system, and the system is sealed to prevent components from entering or leaving the spring system. Depending on the brand and make, the gas spring may be lubricated by additional oil; this oil improves the spring’s seal and helps ensure the gas contained within the system is unable to escape.

    Gas Springs Contain Nitrogen

  • To facilitate its function of absorbing impact, gas springs are filled with a neutral gas that can be easily compressed with minimal risk of explosive reaction. While the precise composition of gas springs may vary from manufacturer to manufacturer, the primary component of most gas springs is nitrogen; chosen for its neutral nature, nitrogen inside a gas spring quickly returns to its natural state after being compressed. In addition, nitrogen does not react with lubricants used to keep the gas spring system sealed, and is unlikely to explode when exposed to oil under high pressures. Finally, nitrogen is both readily available and economical, making it ideal for use in gas springs.

    Gas Springs Absorb Shocks

  • When gas springs are exposed to impact, a rod protruding from the system is forced into the inside of the spring system. As the rod enters the system, an attached piston compresses the nitrogen inside the pressure tube. Compressed under load, the neutral nitrogen simply expands back into its original size, pushing the piston outward and extending the attached rod back into its standard position.

    Mathematical References

  • While the process of compression and expansion in a gas spring happens very quickly and is facilitated by simple mechanical functions, a number of complex mathematical formulas describe the spring’s operation. As the rod and piston are pushed inside the gas spring tube, the nitrogen becomes compressed under a compression ratio known as the “K-Factor.” In simple terms, the K-Factor describes how very high compression results in very rapid expansion of the nitrogen inside the spring. The K-Factor, expressed as the force of the spring under compression divided by the force of the spring fully extended, also helps to explain the resistance of the spring to compression.

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    Gas Springs

    August 9th, 2010

    Gas springs provide a number of benefits in automotive, marine, industrial and domestic springing applications, especially wherever controlled damping is required. Whether displaced in tension or compression, gas springs provide a nearly constant force through their entire stroke as compared to coil or leaf metallic or composite springs. They can also be constructed with special features such as variable damping and blocking. When applied properly, gas springs are reliable and long-lasting alternatives to coil and leaf springs in linear situations.

    Gas Springs are Mechanical Systems
    In their most basic form, gas springs are essential simple mechanical systems. The main components of a gas spring—rods, pistons, tubes and gas—interact with one another to absorb shocks and jolts. Gas springs are also closed systems, as the gas used to absorb impacts is completely contained within the shock system, and the system is sealed to prevent components from entering or leaving the spring system. Depending on the brand and make, the gas spring may be lubricated by additional oil; this oil improves the spring’s seal and helps ensure the gas contained within the system is unable to escape.

    Gas Springs Contain Nitrogen
    To facilitate its function of absorbing impact, gas springs are filled with a neutral gas that can be easily compressed with minimal risk of explosive reaction. While the precise composition of gas springs may vary from manufacturer to manufacturer, the primary component of most gas springs is nitrogen; chosen for its neutral nature, nitrogen inside a gas spring quickly returns to its natural state after being compressed. In addition, nitrogen does not react with lubricants used to keep the gas spring system sealed, and is unlikely to explode when exposed to oil under high pressures. Finally, nitrogen is both readily available and economical, making it ideal for use in gas springs.

    Gas Springs Absorb Shocks
    When gas springs are exposed to impact, a rod protruding from the system is forced into the inside of the spring system. As the rod enters the system, an attached piston compresses the nitrogen inside the pressure tube. Compressed under load, the neutral nitrogen simply expands back into its original size, pushing the piston outward and extending the attached rod back into its standard position.

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    Custom springs suit automobile applications

    August 3rd, 2010

    Torsion springs can be either single, which gives a higher force in a smaller space, or double, which provides a balanced force or torque.

    A modern car interior contains springs in the centre console, glove box, cup holders, grab handles, sun visors and door mechanisms, the designof which has to take into account factors as tactility and strength, available space and operational life.

    With so many options available, many car interior manufacturers are using the total design service available from William Hughes to engineer individual springs that provide the most cost-effective solution for each application.

    Torsion springs provide a perfect solution for many automotive applications.

    They can be either single, which gives a higher force in a smaller space, or double, which provides a balanced force or torque.

    To overcome friction springs can be coated with special materials or the spring geometry can be optimised to minimise the effect.

    Other options include tension or compression springs in a range of sizes and materials.

    In modern vehicles, each part of the car interior needs to impart the right ‘feel’ to the driver.

    So when the design engineers at William Hughes were asked to develop a special torsion spring to release an armrest catch on a central console, ergonomics were the primary consideration.

    The catch mechanism had to be designed to slow the movement of the console to make it open gently.

    The team at William Hughes was provided with a complete set of parameters for the operation.

    The design engineer needed to fully understand every aspect of the application to ensure that the proposed design would be both economical and fully compatible with the plastics and fabrics also used in the assembly.

    The designer needed to consider how the unit could be assembled quickly and easily.

    With the help of the latest computer aided design software and specialised spring data, William Hughes used their knowledge and experience to develop a spring that was optimised for the application.

    In this instance a single torsion spring provided the best solution and William Hughes was able to quickly produce prototype springs for evaluation before the design was finalised for volume production.

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    Gas Springs and Dampers

    August 1st, 2010

    A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air handling equipment. A damper may be used to cut off central air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room temperature and climate control. Its operation can be manual or automatic. Manual dampers are turned by a handle on the outside of a duct. Automatic dampers are used to regulate airflow constantly and are operated by electric or pneumatic motors, in turn controlled by a thermostat or building automation system.

    The major application areas for gas springs and dampers in RV interior design include storage shelves, luggage compartment doors or top cabinet doors. For these and more, the goal is to allow users to open, close and hold in place any doors conveniently and safely. No matter whether it’s the small lid on a top cabinet or a large bench with storage underneath: The ready-to-install LIFT-O-MAT gas springs will provide force-assist and optimum weight balancing. In the case of heavier lids, such as in prop-up bed frames, they will prevent accidental closing through end position locking (anti-crushing protection). Their dampening effects and linear spring curve characteristics will always make sure that parts move smoothly.

    In addition, special variants such as the LIFT-O-MAT PTL offered by STABILUS are a technological wonder. This gas spring is hydraulic and possesses a locking mechanism similar to a ballpoint pen, making it the elegant solution for integrating space-saving bar cabinets, TV platforms or terminal strips into the interior of an RV. And such “convenience wizards” can also be found in other gas spring lines from STABILUS. One of them is the locking BLOC-O-LIFT T. With its assistance, even the height of heavy tabletops can be adjusted easily and evenly. The locking function can be released by a hand or foot lever.

    Besides gas springs, the hydraulic dampers (STAB-O-SHOC) from the Koblenz-based company play an important role in the interior design of motorhomes and trailers. They will brake excessively fast motions of storage compartment lids and covers. This will not only increase convenience and safety for users but also be easy on the fittings.

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    September 28th, 2009

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    New Infusion Set

    September 4th, 2009

    Pump maker Disetronic announced on May 29 that its new Ultraflex Soft infusion set is now available for all insulin-pump users.

    The Ultraflex Soft has a reversible connector at the base that “clicks” into place. In addition, it has a cannula that is tapered for easier insertion.

    “We built this product from the ground up, using patient input to create the right features,” says John Odegard, marketing manager for Disetronic. “The Ultraflex is different from the Quick-set and Sof-set because the reversible ‘click’ connection system is much easier for persons who are vision impaired or have neuropathy.”

    Odegard says the Ultraflex disconnects easily at the base, has a flexible Teflon cannula and doesn’t need an insertion device. It also has a clear window at the top of the infusion set, which makes it “easy to view your insertion site.” Compared with the Sof-set, Odegard says the Ultraflex introducer needle is a smaller 27-gauge.

    “The Sof-set has a 26-gauge needle, which extends four mm beyond the cannula,” he says.

    The Ultraflex Soft has a 90-degree insertion angle, as well as a soft Teflon cannula, which can flex with the patient’s body tissue.

    The universal connection feature is compatible with all insulin pumps on the market. The set come sin two cannula lengths and three tubing lengths to fit all body sizes and types.

    Odegard says all infusion sets need to be changed approximately every three days.

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    Investment casting

    September 4th, 2009

    Investment casting is an industrial process based on and also called lost-wax casting, one of the oldest known metal-forming techniques. From 5,000 years ago, when beeswax formed the pattern, to today’s high-technology waxes, refractory materials and specialist alloys, the castings allow the production of components with accuracy, repeatability, versatility and integrity in a variety of metals and high-performance alloys. Lost foam casting is a modern form of investment casting that eliminates certain steps in the process.

    The process is generally used for small castings, but has produced complete aircraft door frames,
    steel castings of up to 300 kg and aluminium castings of up to 30 kg. It is generally more expensive per unit than die casting or sand casting but with lower equipment cost. It can produce complicated shapes that would be difficult or impossible with die casting, yet like that process, it requires little surface finishing and only minor machining.

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