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On 17 August 1888, the Swedish inventor Johan Petter Johansson (1853-1943) took out his first patent on the adjustable pipe wrench. [3] The Swedish Patent Office issued the patent again in 1894. [4] The idea emerged after he established his company Enköpings Mekaniska Verkstad. Back then, nut dimensions were poorly standardized, so each time a ...
A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...
A plumber wrench A plumber wrench, with the key ring on the thread of the left handle Johan Petter Johansson with his wrench. A plumber wrench (or plumber's wrench, pipe wrench, Swedish wrench or Swedish pattern wrench [1]) is a form of plier described as a pipe wrench that uses compound leverage to grip and rotate plumbing pipes.
To bind a document, the user first punches holes in the paper with a specialized hole punch. Pages must be punched a few at a time with most of these machines. If hard covers are desired, they must be punched as well. In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document.
Usually, the punch and die are close to the same dimensions, creating a sheared edge when they meet. A punch that is significantly smaller than the die can be used to produce an extruded hole where the punch displaces the punched material to the sides, forming a tube perpendicular to the punched sheet. [2] [3]
A 3/4 inch conduit size punch actually punches a hole that is approximately 1.1 inches diameter for 3/4 nominal size conduit. A dimensional size punch makes a hole very close to the indicated size. Punch sets are available on both imperial and metric sizes. Chassis punches are available in a number of shapes, round being the most common.