Staple remover
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A staple remover (or staple decleater) is a device that allows for the quick removal of a staple from a material without causing damage. Although a simple metal wedge can be used, this method tends to tear fragile papers. For light gauge staples, many people instead use a device consisting of two opposing wedges on a pivot. For convenience, this device has a spring that returns it to the open position after use.
Some staplers, mainly small ones that are about 1.5 inches long contain an integrated staple remover. This is basically a piece of metal that is slid under each "curled" side of the staple and turned to loosen the staple.
Staple Removers are known as decleaters in many former British Colonies, such as Barbados.
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[edit] Staple Remover Use
Proper use of the opposing wedge staple remover should also be noted. Staples should be removed via the flat, top side of the staple, not the back "curled" side of the staple. This can however often result in ripping of some paper, so some prefer to loosen the staple via the "curled" side before proceeding to the front flat side for easy removal.
[edit] Staple Remover Design
A standard staple remover is constructed of just five distinct components: • two plastic grips • torsion spring • two sets of metal swinging wedges (a.k.a the blades) • metal pin axle • two smaller pins
The design is focused on functionality and robustness with no unnecessary decoration (unless one includes the ergonomics of the handle) and minimised number of parts to lower costs and production time. The device works with a pincer action to unfold and pull out a staple in one motion.
[edit] Staple Remover Components
[edit] Blades
The two pivoting blades interlock each other. They are made of Chrome Plated Steel, which is harder than the thin ductile wire of the staple and strong enough to withstand the force required to remove it. The Chrome plating provides not just a chic finish but also a mild rust-resistance suitable for use in an office environment away from any liquids let alone corrosive ones. Though the blade is made from what was originally sheet metal; the right angles and clean edges mean that a punch and die method of production would not be suitable. Therefore the piece of sheet metal is cut using the process of blanking in a mechanical press then bent in a press brake. This is a highly automated method which allows for a production rate of up to 1500 units per minute.
[edit] Torsion Springs
The torsion spring in this staple remover is a standardised component that appears in many other products such as clothes pegs. It has two loops and is made of Chrome-plated Steel. They are mass produced by a spring winding machine which cold winds wire around an arbour before heat treating to make it harder. The spring is then chrome plated. The machinery to do this is large, expensive, but has a high production rate. That is why the springs are usually bought off-the-shelf from a tier 1 supplier rather than produced in house. The material, steel is an excellent choice for this use, as there is a point of minimum stress where continued use (opening and closing the staple remover) will not cause failure through fatigue.
[edit] Plastic Grips
The plastic grips are in fact unnecessary and the device could still be operated without them. They provide enhanced ergonomics so the user does not have to press their fingers against sheet metal. Injection moulding of thermoplastics are normally used through the use of an automated injection moulding machine, which shoots liquid plastic into a mould where it is left to set. Such processing is commonplace, not very labour intensive, cheap and capable of producing high quantities. Plastic is used as it is the easiest, but also the cheapest and most readily available material that can be formed into such fluid shapes.
[edit] Pin Axle
The pin axle provides a cylindrical bar from which the blades can rotate. It is made of Stainless Steel, which will not rust in areas that have been worn by contact with other metals. The process to create such a pin axle is quite intensive and hence it is bought off-the-shelf from a supplier. They are made by a specialised machine which cuts thick wire into a suitable length and then die punches the head of the pin, the supplier normally runs specialised machinery that is capable of producing large amounts of products at a high rate for a low cost.
[edit] Staple Remover History
The form of destapler described above was invented by William G. Pankonin of Chicago, Illinois. A patent application for the same was filed on 12th December 1932, granted on 3rd March 1936 and published on 3rd April 1936 as patent document US 2,033,050 A.
A modified version, also capable of removing broken staples, was patented by Joseph A. Foitle of Overland Park, Kansas, but does not see widespread use, despite overcoming several disadvantages of the former device by a simple, yet novel and inventive, modification. The patent for the latter invention was filed on May 28, 1969 and was granted on December 28, 1971, published as US 3,630,486 A. An excerpt from the patent application reads as follows:
"... A device for removing broken portions of wire staples ... comprising a pair of overlying planar arms pivoted together on an axis normal thereto, said arms having cooperating notches ... whereby relative pivotal motions ... may be engaged over the projecting portion of a broken staple..."
[edit] See also
