Toggle clamps are also named quick clamp,quick release clamp,over-center clamp etc.
A toggle clamp is a fastening device that usually consists of a handle to control the device, a holding bar to grip the work piece, and a linkage system of pivot pins and levers to boost the applied force(see structure picture below). Once engaged, the toggle clamp essentially becomes locked. A toggle clamp typically serves to secure an object tightly in order to prevent it from moving or separating when inward pressure is applied.
Your toggle clamps contain:
l Handle to operate
l Clamping arm to reach the work piece
l Linkages for multiplying the applied force
l Spindle for pressure adjustment
l Base for mounting at the workplace
HOW it works/toggle principle
Toggle action clamps operate through a linkage system of levers and pivots (fulcrum). The fixed-length levers, connected by pivoting pins, supply the action and clamping force. The toggle action has a lock point which is a fixed stop and linkage. Once in the lock position, the clamp does not unlock unless the linkage is moved/released. Although oriented in different ways, most toggle clamps are designed using this basic principle.The advantages of toggle clamps
ü TIME SAVING: The clamping and release is achieved in seconds, this gives tremendous time saving per cycle.ü EASY TO INCORPORATE: No additional accurate machining, slotting etc. is needed while using this clamps in any tooling.
ü VERSATALITY: Available in push, pull, hold down, latch type, plier type.
ü DURABILITY: All vital components are hard and zinc plated giving adequate wear and corrosion resistance ensuring longer working life.
ü LOW MAINTENANCE: These clamps are virtually maintenance free. Occasionally few drops of lubricating oil are all that is needed to keep them in good working condition.
ü COST SAVING: Tooling costs are reduced as tool design and tool making become simpler. Reduced cycle time reduced with low maintenance. Reduced production cost by increasing productivity
Toggle Action Clamps Compared with Cam Action Clamps
Cam action uses frictional force to effect a lockingcondition between the cam surface on the bar andthe follower on the handle. Toggle action clamps have many advantages over cam action clamps,mainly because cam action damps allow some movement while clamping. Toggle action clamps thus provide a more consistent clamping point, can be manufactured from inexpensive materials, and are available in stainless steel for outdoor or corrosive applications. If the material being clamped has a variable thickness, however, a cam action clamp has the ability to better accommodate this application.You can read more details at toggle clamp introduction
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