Pad Mounted Arm Swing Operator
By Huu Khanh Nguyen · Updated October 29, 2026 · doorking, folding-arm, swing-operator, pad-mount, post-mount, articulated-arm
A swing gate operator in a weatherproof cover that stands on a pad or a post beside the gate and swings the leaf with a two-piece folding arm.
Parameters
| Name | Default | Unit |
|---|---|---|
| Leaf angle | 0 | ° |
| Opening angle | 90 | ° |
| Hinge depth in the post | 0 | mm |
| Mounting height | 260.35 | mm |
| Sliding travel | 0 | mm |
| Leaf length | 2000 | mm |
| Leaf weight | 200 | |
| Handing | left | |
| Number of leaves | 1 | |
| Post width | 200 | mm |
| Leaf guidance | ground | |
| Shaft behind the hinge axis | 304.8 | mm |
| Shaft along the open leaf | 1092.2 | mm |
| Bracket distance on the leaf | 863.6 | mm |
| Crank arm length | bracketDistance * Math.sin(openingAngle * Math.PI / 360) | mm |
| Connecting arm length | Math.hypot(shaftBehind + bracketDistance, shaftAlong) - crankLength | mm |
| Bracket pin x | (bracketDistance) * Math.cos(leafAngle * Math.PI / 180) - (0) * Math.sin(leafAngle * Math.PI / 180) | mm |
| Bracket pin y | (bracketDistance) * Math.sin(leafAngle * Math.PI / 180) + (0) * Math.cos(leafAngle * Math.PI / 180) | mm |
| Crank arm angle | Math.atan2(eyeY - (shaftAlong), eyeX - (-shaftBehind)) * 180 / Math.PI + -1 * Math.acos(Math.max(-1, Math.min(1, ((crankLength) * (crankLength) + Math.hypot(eyeX - (-shaftBehind), eyeY - (shaftAlong)) * Math.hypot(eyeX - (-shaftBehind), eyeY - (shaftAlong)) - (connectingLength) * (connectingLength)) / (2 * (crankLength) * Math.hypot(eyeX - (-shaftBehind), eyeY - (shaftAlong)))))) * 180 / Math.PI | ° |
| Elbow pin x | (-shaftBehind) + (crankLength) * Math.cos(armAngle * Math.PI / 180) | mm |
| Elbow pin y | (shaftAlong) + (crankLength) * Math.sin(armAngle * Math.PI / 180) | mm |
| Finish | white |