wire rope limit switch free sample

Our Bulletin 440E Lifeline™ 4 Cable Pull Switches can be installed along or around awkward machinery such as conveyors and provide a constant emergency stop access. The system includes a rope status indicator and emergency stop button mounted on the switch lid. This switch is also available in stainless steel 316 and is suitable for external use, applications where there are hygiene requirements, and other situations where a level of corrosion resistance is required.

Honeywell̵7;s MICRO SWITCH CPS Series Cable-Pull Safety Switches provide a readily accessible emergency stop signal, a cost-effective means compared to using multiple emergency stop push-buttons. The CPS Series Cable Pull Safety Switch̵7;s internal mechanism latches on both slackened cable (push) and pulled cable.

The various steute position switches differ in their actuators (rocking levers, roller levers, spring rods…), in their switching inserts (number of NC/NO contacts; snap or slow-action) and in their housing material (plastic or metal). Many series have standard dimensions (EN 50041 or EN 50047). In addition to the versatile basic products, the range also includes "specialists" for defined tasks. Upper limit switches are used in cranes, for example, sending a signal when the hook block has reached its uppermost point. Slack rope switches, in contrast, are used in conveyor systems to monitor rope tension.

In Löhne, steute develops and manufactures position switches for general automation technology which are both very durable and very reliable. The spectrum ranges from miniature limit switches to heavy-duty upper limit switches. The position switches are often used in safety-related applications, e.g. for the position monitoring of guard doors.

The steute business unit Extreme has products which include ATEX-certified position switches for explosive zones, limit switches for extreme temperatures and switches for applications in very dirty environments. One special series within the Extreme range is cable-free, explosion-protected position switches which communicate with a receiver unit by remote control. These products are to be found under the heading Ex wireless position switches. The Ex 97 and Ex 99 limit switches are also new and unique to the steute product range. These position switches are explosion-protected variants which can be used in ambient temperatures down to -60 °C and which still pass the 7-Joule impact test.

Wireless position switches open up whole new possibilities and bring additional flexibility to the construction of machines and plants. These switches can be installed very easily – even on moving components. The steute business unit Wireless offers different series and different wireless protocols (sWave® or EnOcean) which differ, amongst other things, in their range and transmission mode (with/without confirmation of receipt, uni/bidirectional). Suitable position switches are also available for integration in the sWave.NET® wireless network.

"This invention relates to a novel device to prevent the lowering of a loaded or unloaded wire rope hoist should an obstruction prevent the downward movement of the hook or load by stopping the hoist motor when the slack rope condition is detected, signaling an audible or visual alarm, or both. Failure to stop accumulation of slack rope may result in a dangerous condition if the obstruction is released causing free fall of the load, Also slack rope can cause the hoisting rope to become free of the drum grooves resulting in possible cross-over of the rope, damaging the rope and compromising safety.

Various methods to detect slack rope condition are used, usually requiring modifications or attachments to the hoist which may be expensive and difficult to install or may not be suitable for existing equipment.

The present invention will provide a low cost, safe and reliable means for detecting a slack rope condition, which is easy to install, does not require modification or attachments to the hoist, takes a minimum headroom distance and may be easily adjusted in the field.

In the drawings which illustrate the embodiment of the invention, FIG I shows the typical means of installation on a hoist, whereby the lifting rope is wound on a drum, passes through one or more pulleys and is anchored to the dead end.

The device is clamped to the hoisting rope near the dead end and senses if the rope is taut or slack. FIG 2 illustrates the device. The wire rope 1 pass through clamps 2 and 3 where it is securely clamped ."The rope continues and passes through a grooved portion of item 4 which is held in contact with the rope by pressure from spring 10. If the rope becomes slack item 4 will rotate around pivot 5 causing tripping of the limit switch 7 thereby signaling that the slack rope condition exists.

The setting of the switch is field adjusted to suit each individual hoist. The adjusting screw 11 varies the spring tension and the adjusting screw 8 sets the tripping point of the limit switch 7. Also the spring 10 can be supplied in various options to suit hoist parameters.