Spring Counterbalance Mechanism
AssemblyPair of spring-loaded pivot arms on the frame that offset the weight of the door and folded ladder so the unit opens slowly and closes with light effort. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Bill of materials for Spring Counterbalance Mechanism
5 top-level lines as of r7605| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Pivot Arm | attic-ladder-pivot-arm | 2× | 2 | · | part |
| 2 | Coil Spring | coil-spring | 2× | 2 | · | part |
| 3 | Spring Anchor Plate | attic-ladder-spring-anchor | 2× | 2 | · | part |
| 4 | Pivot Pin | attic-ladder-pivot-pin | 4× | 4 | · | part |
| 5 | Arm Connecting Link | attic-ladder-arm-link | 2× | 2 | · | part |