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PRODUCTS SPRINGS & SHOCK ABSORBERS


HEAVY DUTY DIE SPRINGS STORE MORE ENERGY WITH LESS STRESS


Not only are Lee Spring’s Heavy Duty Die Springs made from different shaped wire than traditional die springs, but they work in slightly different ways. In an independent test conducted by the Institute


of Spring Technology, the Heavy Duty Die Springs demonstrated a life-expectancy at least equal to traditional rectangular wire Die Springs, but they are up to 50% cheaper than the rectangle coil versions, the company explains. The springs are manufactured using round wire


with very tight wound diameters so they store more energy with less stress, and are specifically designed for heavy duty applications, making them up to 30% stronger than their rectangular wired cousins, Lee Spring adds. There are five different types of Hefty Die Springs, based on load, for applications requiring medium duty up through extra heavy duty Die Springs. These are colour coded for ease of identification. With these, shot-peening is used for extended life; pre-setting to prevent length loss in


operations; plus grinding of closed ends to provide squareness and adequate large bearing surfaces for use in applications where heavy duty compressions are called for. The springs are available in Music Wire or Chrome Silicon alloy, and powder coated for general


corrosion resistance. Typical applications include die presses, engineering machinery, brakes, clutches, soft drive mechanisms, agricultural equipment, etc.


Lee Spring www.leespring.co.uk HIGH PERFORMANCE SPRING-APPLIED BRAKE LAUNCHED


Robust, easy to install and reliable, INTORQ’s new BFK518 combines the advantages of a spring-applied brake with the performance of a permanent magnet brake. With its high and reliable holding torque, small dimensions and high temperature stability, the spring-applied brake suits a wide variety of applications – from robotics to packaging technology and production machines. The extremely high braking torque is the result of


the large friction radius of the rotor and the small air gap, which is produced within a narrow tolerance range. A flange manufactured as a bent sheet metal part serves as a support structure that tightly abuts the rotor – this means the friction surface is used 100%. Unlike permanent magnet brakes, spring-applied


brakes do not require any setting work, which saves time and prevents errors. The BFK518 also does not require axial positioning – the friction disc is designed to automatically set the correct position. The installation position of the brake is also flexible. Spring-applied brakes are failsafe


brakes. Multiple compression springs produce the braking torque in the de-energized state through frictional


locking. Even if the power fails, the failsafe brake ensures complete safety. The brake is released electromagnetically: the coil


of the stator is energized with DC voltage. The resulting magnetic flux works against the spring force to draw the armature plate to the stator.


INTORQ


COILED SPRING PINS - AN EASY TO INSTALL SOLUTION


With their square ends, concentric chamfers and lower insertion forces, plus their ability to accommodate wider hole tolerances because they compress during installation and conform to the shape of the hole, Coiled Spring Pins are the easiest type to install, according to Spirol. The Coiled Pin’s nominal diameter represents the recommended hole size for the product into which they are being installed. If only a handful of prototype assemblies are needed,


manufacturers normally install these using a hammer. But sometimes, particularly if the pins are small, a pin driving chuck can be used. To install, secure the pin driving chuck into the press or air hammer. Next, manually insert the Coiled Pin into the end of the driver; then place the exposed end of the pin into the hole and complete the installation by advancing the press handle or actuating the air gun. Presses and air hammers with pin chucks allow for better


axial alignment, control and quicker cycle times compared to a hammer, and are a good solution for small to medium


24 DECEMBER/JANUARY 2020 | DESIGN SOLUTIONS www.intorq.com


volume production. Pin driving chucks also allow manufacturers to control alignment and insertion depth. Automatic pin inserters, which are completely self-contained, are


preferred for high production volumes and for small diameter pins that are difficult to handle. With these, the fastener is oriented in a vibratory feeder and fed to a shuttle mechanism that positions the fastener directly underneath the insertion quill. The shuttle is mounted on a retracting mechanism that positions the pin exit bushing as close to the assembly as possible for insertion, then retracts for unobstructed loading and unloading. The use of a spring-loaded alignment pin is recommended


for assemblies with through-holes to ensure alignment is maintained between the pin and the holes of the assembly components throughout the entire installation process. A spring-loaded alignment pin is fixed on the installation table and is used for alignment of the assembly prior to and during installation. Spring-loaded alignment pins (also known as locating pins) have spring mechanisms so they retract as the pin is inserted into the assembly.


Spirol www.spirol.com


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LOCKING GAS STRUTS


New from Camloc Motion Control are Blocklift locking gas struts, the latest product within the company’s range of gas struts and dampers. These feature an internal locking mechanism which allows the strut to be locked in any position along the length of the stroke. An adjustable force version has been


developed whereby the struts force can be adjusted down using a 2mm Allen key to suit the application requirements. There are four products in the range:


the BL1 which is rigid in extension, the BL2 which stays rigid in compression, the BL3 with elastic locking, and the BL4 which remains rigid in both extension and compression. The Blocklift range is suitable for


such applications as the height and angle adjustment of seats for the aerospace, bus, train and specialist and military vehicle sectors. It also provides controlled adjustment on hospital beds, physiotherapy tables and wheelchairs for the medical sector.


Camloc Motion Control www.camloc.com


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