C72 - Friction Control Levers

Product Brand: Arens Controls

The Arens C72 friction lever differs from conventional levers in that its friction plate bears on a two-inch radius arc rather than merely squeezing a small washer pad at the pivot. (A hardened steel ball rolls on the opposite side of the arc to equalize the friction drag.) This design offers several advantages, including more repeatable drag, finer adjustment and more resistance to side loads.


The C72 Series control is available as a complete assembly or, by starting with the basic friction lever unit, specialized configurations may be created using standard input and output levers, cable hardware and mounting kits.

Specifications
Maximum operating load on output 100 in/lbs
Input/output lost motion NIL
Free-running torque 20 in/lbs
Adjustable Friction
Free-Running (Dynamic) Friction Hold (Static) Detent Breakout (C72114)
10 9-10 10-11
15 14-15 15-16
20 18-20 20-22
25 22-25 25-30
30 27-30 30-40
35* 32-35 35-50
* Maximum recommended free-running torque.

 

Associated Products

Q14

Q14

The Arens Q14 Series control has five main elements: A primary input lever, an actuating or output lever, two 'scissor' locking shoe assemblies and a stationary quadrant. The function of the assembly is to allow unrestricted movement through the use of the input lever while preventing any movement by forces acting through the output lever.

A force applied in either direction at the output lever creates a binding or “shear” action on the hardened steel quadrant between the gripping shoes at points depending on the direction of the force. The binding action results from a slight rotation of the shoe assemblies about the pivot, due to the pressure exerted on the shoes by the output lever. This creates an irreversible lock in both directions, which effectively resists all forces acting on the output lever.

Specifications
Maximum operating load on output 100 in/lbs
Maximum self-locking capacity 200 in/lbs
Input lost motion
Output lost motion
With no load
0.5°
Input torque 1.2 x output torque
Free-running torque 20 in/lbs
* The Q14 Series requires input lever lost most motion of approximately 1/2¡ (or 0.010 inch at the adjustment screws) per side for positive locking. Adjustment may be required after an initial break-in period and, in some applications, throughout the unit's life.

Q15

Q15

The Arens Q15 Series control mechanism has five main elements: a primary input lever, an actuating or output lever, two "scissor" locking shoe assemblies and a stationary quadrant. The function of the assembly is to allow unrestricted movement through the use of the input lever while preventing any movement by forces acting through the output lever. 

A force applied in either direction at the output lever creates a binding or "shear" action on the hardened steel quadrant between the gripping shoes at points depending on the direction of the force. The binding action results from a slight rotation of the shoe assemblies about the pivot, due to the pressure exerted on the shoes by the output lever. This creates an irreversible lock in both directions, which effectively resists all forces acting on the output lever.

Specifications
Maximum operating load on output 100 in/lbs
Maximum self-locking capacity 200 in/lbs
Input lost motion*
Output lost motion
With no load
0.5°
Input torque 1.2 x output torque
Free running torque 20 in/lbs
* The Q15 Series requires input lever lost most motion of approximately 1/2¡ (or 0.010 inch at the adjustment screws) per side for positive locking. Adjustment may be required after an initial break-in period and, in some applications, throughout the unit's life.
 

Q36

Q36

Arens Q36 Series control mechanism uses a "strap-shoe locking mechanism" which has four main elements: a primary input lever, an actuating or output lever, a strap-shoe / locking pin assembly and a stationary quadrant. 

The strap shoe assembly is spring-loaded to the unlocked position until a load is applied to the output, causing the strap-shoe to rotate about the locking pivot, forcing a locking pin to grip the quadrant. The gripping force caused by a pin on the underside of the quadrant and the strap-shoe locks the control. Two locking pins enable the control to lock with an output load from either direction.

 

Specifications
Maximum operating load on output 200 in/lbs
Maximum self-locking capacity 400 in/lbs

 

Input lost motion
With 100 in/lbs load on motion*
2.5° max.
Output lost motion
With full reversal of 100 in/lbs. load
3.5° max.
Min. output load required for self-locking 50 in/lbs
Input torque as a percentage of maximum operating load on output @ 20% = 3.0 x
output torque
@ 60% = 1.6 x 
output torque
@ 100% = 1.2 x
output torque
Normal free running torque 20 in/lbs
Torque to breakout of center detent 40 in/lbs
* Input lost motion is built-in at factory and no adjustment is provided.
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