What is a Floor Spring?
Floor spring units are hydraulic units fitted to aid door closing, on heavier, more industrial and commercial use doors.
They are used in place of the more standard face fixed door closer and are most suitable for conditions with heavier duty requirements.
They are set into the floor underneath the door and are covered by a metal cover plate, made in either stainless steel or brass finish.
Over time a door closer can leak oil from one or more of the following places: the seals where the parts are put together; the adjustment screws; and the arm pivot. To understand why oil leaks occur, you need to understand how the closer works.
A door closure, floor spring or transom (overhead) closer is basically a box (called the body) containing a hydraulic coil spring – that is, a metal spring and oil.
When the door opens the spring is ‘coiled’ or squeezed. It wants to uncoil and return to its natural position. This is what pulls the door back to a closed position. However, without the oil the door would gather momentum as it closes and would slam shut (or, in the case of a door that opens both ways, travel past the closed position and be at risk of hitting someone). The correct oil pressure inside the body is what ensures that closing happens at a safe speed.
During opening and closing the oil inside the body is under pressure. This then puts the seals under pressure, and if they are not strong enough they will leak oil. Once this happens then the only solution is to replace the closer.
Prior to 1970 door closer bodies had lids that screwed into place, meaning that parts inside could be replaced or repaired and oil could be topped up. However in all modern closers the body is a sealed unit which, once broken, cannot be repaired.
Once a door closer starts leaking oil the door will then slam closed because there is not enough oil pressure to ensure that it closes slowly. It is not possible to ‘refill’ the closer with oil and the unit must be replaced.
Not closing properly / staying open
If you find that your doors do not close at all then this is very often the long-term result of an oil leak. When a closer is leaking oil and the door is slamming shut for a long period of time then the coil spring will usually break. Another reason could be the arm is worn on the pivot or the fixing bolt has come loose due to lack or regular servicing. As above, the only solution is to replace the closer.
Choose a model and color that will blend in with the woodwork in your home.
Position paper templates that comes with the closer to the door facing and door, as shown in the instructions, and hold them in place with tape.
Drill pilot holes through the template into the door facing and door.
Screw the door closer to the door facing.
Screw the arm bracket to the door.
Attach half of the closing arm to the door closer.
Attach the other half of the closing arm to the door.
Link the two halves of the closing arms together.
Adjust the tension screw on the pneumatic cylinder to regulate the closing speed.
Add the cover housing to give the residential door closer a finished look.