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Howdon produces a wide range of Couplings that can be used in many different industries 

Gear Couplings 

A range of robust gear couplings that can accommodate angular misalignment as well as accepting end float with high torque ratings. Available in single engagement type RGS and double engagement type RGD design, these couplings give maximum power capacity within minimum space. 
Manufactured to AGMA standard, couplings are fully interchangeable. 
Applications: Steel, mining, paper and textile industries. 
1. Bolt 
2. Gasket 
3. Nut 
4. Sleeve 
5. O-ring 
6. Oil plug 
7. Hub 

Pin & Bush Couplings 

Our Pin and Bush Couplings range is a range of general-purpose flexible couplings providing misalignment together with the ability to accept shock loading. Manufactured with steel flanges and urethane bushes, these couplings give reliable, flexible and temperature resistant service. 
Applications: Conveyors, mixers, pumps 

Layrub Couplings 

The Twiflex Layrub Coupling range is a long-established but still unique design based on a range of twelve standard blocks. It is generally used to cover the low to medium power ranges up to torque ratings of 64 kNm. The blocks can be used in parallel leading to compactness and making the coupling suitable for high-speed operation or in series to provide a torsionally soft coupling and to accommodate large misalignments. 

Advantages of Layrub Couplings 

A particular advantage of the Layrub product is the ability it provides to engineer a coupling to suit the application. As well as being able to call upon a large range of standard couplings we are able to arrange the standard blocks into a customised design and to tailor the characteristics to suit the application. 
The large volume of the rubber blocks gives these couplings a relatively low torsional stiffness and good damping characteristics. This makes the Layrub particularly suitable for the control of torsional vibration. 

Phasing Hubs 

Phasing Hubs are manufactured to accept Taper Lock Bushing. 
Adjust timing sequence with clamp screw slackened, allowing plate wheel to rotate freely. 
Save time with threading chain through complex machine layouts. Hubs for B.S or A.S plate wheels. 
Suitable for timing pulleys, gears and cams. 
Designs to suit special drive requirements are available. 
Phasing Hubs can be supplied with Howdon “Wedgepin” overload protection. 
For backlash-free indexing, combined with drive adjustment. 
Applications include: Tobacco Manufacturing, Packaging Machines, Food Processing Machines 
Chain Phasing Hub 
Unit Size 
Outside Diameter A (mm) 
Length L (mm) 
Taper Lock Bush 
Max Bore (mm) 
28 SK 
50 SK 
Plate Wheel Bore (mm) 
51.35 H8 
63.00 H8 
95.00 H8 
Minimum Number of Plate Wheel Teeth 1/2” Pitch 
21 BS 
24 BS 
21 AS 
25 AS 
Minimum Number of Plate Wheel Teeth 5/8” Pitch 
18 BS 
20 BS 
28 BS 
18 AS 
20 AS 
28 AS 
Minimum Number of Plate Wheel Teeth 3/4” Pitch 
18 BS 
24 BS 
18 AS 
24 AS 
Minimum Number of Plate Wheel Teeth 1” Pitch 
19 BS 
19 AS 

Centrifugal Link Clutch  

The Link Clutch Coupling comprises separate driving and driven members - completely disconnected when at rest. 
The driven member is in the form of a drum and the driving member a hub to which lined shoes are connected via pairs of links and rubber bushes. The rubber bushes can be set to control the speed at which the shoes commence to engage, provide frictionless non-wearing pivots and also deflect to accommodate misalignment thereby enabling the clutch to 'double' as an efficient flexible coupling. 
Link Clutch Specification 
Link clutches are supplied with spring restraint when uncoupled engine idling is needed, and in most cases will provide sufficient torsional flexibility and damping. When additional flexibility and damping is required we recommend the use of our FlexiClutch design. 
Twiflex link clutches can be used as a simple, effective, speed limiting brake to launch lifeboats or restrain the fall of elevators or automatic doors. 
Special features for engine and electric motor drives: 
Load free starting prolongs life of motor switch gear and reduces starting currents, aids engine starting in cold weather. 
Peak torques can be utilised to accelerate heavy inertia machinery, permitting use of smaller, less costly squirrel cage motors or less powerful engines, especially where speed increasing drives are involved. 
Misalignment can be accommodated, blind assembly is possible and installation is simplified. 
Overload protection prevents engine stalling, motor overheating, limits vibratory torques and stresses due to sudden jams. 
Engaging speed can be above engine idling speed to permit automatic throttle control. 
Complete disconnection when stationary. Dual or stand-by drives can be engaged or disengaged automatically. 
Motors and engines cannot be driven in reverse by machines such as large centrifugal pumps stopping with a full discharge head of water. 
Flange type hubs facilitate direct mounting to engine flywheels to provide compact installation with minimum axial space. 
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