Hinged Arm Swing Operator
By Huu Khanh Nguyen · Updated October 28, 2026 · nice, hinged-arm, swing-operator, articulated-arm, post-mounted
A swing gate operator whose compact body stands on the post and turns a jointed arm that pushes or pulls the leaf, for large posts and limited space beside the gate.
Parameters
| Name | Default | Unit |
|---|---|---|
| Leaf angle | 0 | ° |
| Opening angle | 90 | ° |
| Hinge depth in the post | 100 | mm |
| Mounting height | 0 | mm |
| Sliding travel | 0 | mm |
| Leaf length | 2000 | mm |
| Leaf weight | 200 | |
| Handing | left | |
| Number of leaves | 1 | |
| Post width | 210 | mm |
| Leaf guidance | ground | |
| Shaft distance along the leaf | postWidth / 2 | mm |
| Shaft distance across the leaf | hingeDepth + 185 | mm |
| Bracket distance on the leaf | 434 | mm |
| Bracket pin x | bracketDistance * Math.cos(leafAngle * Math.PI / 180) | mm |
| Bracket pin y | bracketDistance * Math.sin(leafAngle * Math.PI / 180) | mm |
| Drive arm angle | Math.atan2(eyeY - pivotAcross, eyeX + pivotAlong) * 180 / Math.PI + Math.acos((441 * 441 + Math.hypot(eyeX + pivotAlong, eyeY - pivotAcross) * Math.hypot(eyeX + pivotAlong, eyeY - pivotAcross) - 389 * 389) / (2 * 441 * Math.hypot(eyeX + pivotAlong, eyeY - pivotAcross))) * 180 / Math.PI | ° |
| Elbow pin x | -pivotAlong + 441 * Math.cos(armAngle * Math.PI / 180) | mm |
| Elbow pin y | pivotAcross + 441 * Math.sin(armAngle * Math.PI / 180) | mm |
| Finish | white |