Ratchet Arm & Backstop Clutch
Our backstop clutches are a very economical option for your conveyor system or for rotary action in conjunction with a motor, hydraulic cylinder, pneumatic cylinder, or other mechanical means.
When attached correctly, these Ratched Arm Backstop Clutches can efficiently protect valuable products from reversed torque on any incline conveyors not allowing the conveyor to back up. Simply mount the ratchet arm backstop clutch on your primary drive shaft and attach the ratchet arm end to a fixed position (see note below).
Inversely, when looking to drive through the clutch into the shaft there is no simpler and more compact indexing clutch than this. Due to an infinite number of potential engagement points on the circle (no cogs), these indexing clutches offer the ultimate flexibility in any application.
We can manufacture a ratchet arm clutch or indexing clutch for rotary arm actuation or backstop clutch applications.
Hover over to show more detail of our rachet arm clutch. 
Rachet arm clutch - front view. Fully assembled clutch shown and cut open to show inner cam and ring.
| Assem. No. | A | B | C | D | E | F | G | L | Standard Bores | Torque Lbs./Ft. | Speed RPM |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RA14 | .250 | 1/4 | 1-7/8 | 13/16 | 1-3/4 | 1-1/2 | 7/16 | 8-32 | 3/8, 1/2, 5/8 | 14 | 1800 |
| RA100 | .316 | 5/16 | 3-3/4 | 1-3/8 | 3-7/16 | 3 | 1 | 1/4-28 | 3/4, 7/8, 1, 1-1/8, 1-1/4 | 100 | 1000 |
| RAB200 | 13/32 | 3/8 | 4-1/2 | 2-3/8 | 4-1/4 | 3-5/8 | - | 3/8-24 | 1-1/2, 1-3/4, 2 | 200 | 800 |
| RAB500 | 17/32 | 3/8 | 6 | 2-17/32 | 5-1/2 | 4-3/4 | - | 5/16-18 | 2-1/4, 2-1/2, 2-3/4 | 500 | 600 |
| Assem. No. | A | B | C | D | E | F | G | L | Standard Bores | Torque Lbs./Ft. | Speed RPM |
NOTE: It is recommended on the ratchet arm ends to allow at least 1/16” free play either way on the axial plane. This allows for the cam and shaft to find their true parallelism with the ratchet housing. Tightening down and restricting the ratchet housing will cause misalignment, runout, and all or some of the problems formerly listed.