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Mechanics - Toggle Clamp

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by

James Martin

on 12 May 2014

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Transcript of Mechanics - Toggle Clamp

Toggle Clamp
The
James Martin
Peter Astbury
Eglė Gedvilaitė
James Trott
Jake Claughton

Loughborough University,
13DSA004


Toggling
Mechanical Design
Aesthetics and Ergonomics

Vertical Handle Toggle Clamp
- Fastening device to secure materials
- A clamp that operates on a pivot and lever system
Application:
- Carpentry
- Wood working
- Metal working
- Construction
Considerations:

- Part size and shape
- Holding capacity required
- Strength of the operator
- Uniformity of the part size
Variable Velocity Ratio Machine
- The rate at which the
clamp head moves
changes throughout the
hand stroke
- Effort is saved

Increasing velocity ratio as the handle is moved towards the end point.
A steep increase in velocity ratio (between 48° and 64°) suggests that it is approaching infinity and the output velocity is reduced as the system needs to exert greater force.

Gradual decrease in efficiency of the machine:
Start point – 53,9% Mid point – 20,3% End point – 16%

This is because the greatest effort is needed at the beginning to move the handle towards the vertical position where it reaches the toggling point and then locks in position. However, the efficiency at the start point could be improved as it is quite low.

- When the 3 points align, toggling occurs
- Output velocity reduces
- Mechanical advantage increases
- Greater output force but SAME input force
- At toggling, velocity ratio sharply rises
- Clamp locks after toggling point

Vout --> 0

Improvements:
- Longer lever
- Rubber head on clamping point
- Self lubrication or some other form of lubrication (oiling)
- Anti rust material/ paint
- Cover over the clamping point as to avoid hand or other items
trapping
- Hardened steel on pivot points
Suitability:
- Good, mechanical advantage increases when the most output force
is needed
Aesthetics:
- Standard industrial design
Ergonomics:
- Handle not obvious
- No grip for hand
- Handle is very thin
Improvements:
- Rubber hand grip
- Moulded hand grip to suit hands
- Clearly separate hand grip
- Post clamp instead of locking nut
Increasing Velocity Ratio
- Graph shows mechanical advantage (MA) increases in a similar way
- A slight drop in MA at the mid-point could be the result of friction
- MA increases greatly from mid to end-point.
- The highest point is the machines toggling point
- At this point the output movement approaches 0.
Mechanical Advantage
Velocity Ratio Against Mechanical Advantage
Summary
- Toggling point reached when the handle is in its
vertical position
- Velocity ratio --> infinity
- High mechanical advantage
- Output velocity is reduced as the system needs
to exert greater output force
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