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The Carl Stahl Kromer GmbH Spring Balancers, models 7200, 7211/7212, and 7221/7222, are designed to hold hand-held tools, such as drills and pneumatic screwdrivers, at the ready, reducing operator fatigue and increasing efficiency. These devices are not intended for use as cranes or for lifting heavy loads beyond their specified capacity.
The core function of these spring balancers is to provide a constant upward force that counteracts the weight of a suspended tool. This allows the operator to maneuver the tool with minimal effort, as if it were weightless. When the tool is pulled downwards, the cable extends, and upon release, the spring mechanism automatically retracts the tool to its initial position. The balancers are equipped with a cable stop buffer to limit the maximum cable extension and prevent over-retraction. Some models (7212 and 7222) feature an automatic arresting mechanism, which allows the tool to remain suspended at a desired extended position. To disengage this lock, the tool is pulled slightly downwards and then quickly guided upwards. Slow retraction will engage the arresting mechanism.
The spring balancers are available in several series, each designed for a specific load range and cable travel length.
Model 7200 080...
Model 7211 080... / 7212 080...
Model 7221 080... / 7222 080...
All models are designed for an ambient temperature range of -20°C to +70°C. The fixture to which the spring balancers and fall protection device (4) are attached must be designed with a safety factor of at least 5 (5 x [spring balancer intrinsic weight + maximum permitted capacity]).
Installation: Installation, cable length adjustment, and load capacity adjustment must only be performed by trained and qualified personnel. Plastic-cased versions should not be placed near hot air blowers. The spring balancer is suspended using a safety mounting (2), ensuring it cannot slip out by tightening the retaining nut (2.1). A fall protection device (4) must be attached to the suspension fixture, allowing free movement of the balancer and ensuring a fall distance of no more than 100 mm in case of a crash.
Adjusting Cable Length (only 7221 and 7222): The balancers are factory-delivered with a longer cable (10). Before commissioning, the desired additional cable length must be set. To lengthen, pull the cable (10) through the cable lock (7), maintaining a minimum 100 mm distance between the cable lock (7) and cable clamp (9). Once the desired length is achieved, press the supplied press clamp (8) onto the non-loaded section of the cable and cut off any protruding end behind the clamp.
Adjusting Cable Stop Buffer: The maximum permitted cable travel length must not be exceeded. Attach a load, extend the cable to the desired position, loosen the screws on the cable clamp (9), set the required cable travel length, and re-tighten the screws. The rubber buffer (13) can be manually shifted on the cable between the cable clamp (9) and the housing.
Adjusting Bearing Load: Before adjusting the bearing load, the load must be affixed with the cable fully retracted. Adjusting towards "Plus" (+) increases the load, while adjusting towards "Minus" (-) reduces it. The correct setting is achieved when the attached load can be easily drawn to the desired position and returns to its initial position upon release. Balancers are factory-set to "Maximum load," and all subsequent adjustments must be made from this setting. Failure to follow this instruction can damage the spring. For models 7200, 7211, and 7212, pressing the spring lock (11) applies pre-tension to the adjusting tool, which must be held firmly. Adjustment involves inserting a hexagonal key into the spring lock (11) and turning clockwise to tension or anti-clockwise to stress-relieve. For models 7221 and 7222, the hexagonal key is inserted into the adjusting screw (14) to make adjustments within the permitted range. The adjusting screw (14) acts on the spring lock (11), which has an external marking to observe the adjustment.
Daily Visual Inspections: Daily visual checks for corrosion or damage should be performed on the wire rope, safety suspension (2), and fall protection device (4).
Periodic Inspections: The spring balancer, especially the cable, must be inspected periodically, at least once a year, by a qualified person for damage (ISO 4309). If damage or corrosion is found, operation must cease immediately, the balancer marked as faulty, and the supervisor informed.
Lubrication: It is recommended to treat all moving parts and friction points with an acid-free grease.
Repairs and Dismantling: Repairs, dismantling, and re-assembly work must only be carried out by duly trained and qualified personnel. Only original Carl Stahl Kromer GmbH spare parts, which meet the necessary safety criteria, should be used.
Disposal: Disposal must comply with all current directives for metals, plastics, greases, oils, etc. Any necessary dismantling work must be performed by appropriately trained and qualified personnel.
General| Brand | Carl Stahl Kromer |
|---|---|
| Model | 7200 |
| Category | Safety Equipment |
| Language | English |
