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In 1936 the vibratory compactor was developed by a mechanical engineer Hilding Svenson. In 1940 the company name changed to AB Vibro-Verken. In 1947 it launched the first vibratory plate compactor, which weighed 1.5 tonnes, being nicknamed the frog. It opened its research laboratory in 1948 and manufactured the first vibratory road roller in 1953.
The plate compactor, vibrating plate, or tamper, has a large vibrating baseplate and is suited for creating a level grade, while the rammer compactor has a smaller foot. The rammer, or trench rammer, is mainly used to compact the backfill in narrow trenches for water or gas supply pipes etc. Road rollers may also have vibrating rollers.
Vibrating – a stress is applied repeatedly and rapidly via a mechanically driven plate or hammer. Often combined with rolling compaction (see below). Gyrating – a static stress is applied and maintained in one direction while the soil is a subjected to a gyratory motion about the axis of static loading. Limited to laboratory applications.
Caterpillar soil compactor equipped with padfoot drum, being used to compact the ground before placing concrete Antique "Kemna" steamroller. A road roller (sometimes called a roller-compactor, or just roller [1]) is a compactor-type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations. [1]
A handheld tamper is a small compactor that utilizes static force, which is when only the dead weight of the equipment and pressure the operator applies to it compact the materials. [1] These tampers do not have a motor, only a flat plate attached to a handle. [4] The plate is placed on the material the operator wishes to compact and pressed down.
In 1991, Andy and Neville Kennard who had taken over the business from their father, decided to split the business, with Andy retaining the hire equipment business and Neville taking the self storage business. [1] [2] In 1992, Kennards Hire purchased eight stores from GKN. [3] In 1994 it purchased the remaining 10 GKN stores taking its total to 32.