Lansbury Index page Lansbury International Impact Calibration

Spring Impact Test Hammer
Impact Test Requirements and Product Safety Standards

The ability of equipment to withstand mechanical impact, to ensure continued safety, or continuation of function, is a recognised requirement in most specifications.

Such requirements are specified in ISO, IEC & CEE standards as well as those of BSI, VDE and many other nationalities. In many cases the impact specified is by means of an internationally agreed Spring Operated Impact Hammer calibrated according to the requirements as specified in IEC 817: 1984 and BS 7003: 1988.
These standards have been revised and reissued as the following: BS EN 60068-2-63:1995 and IEC 68-2-63:1991, laterly by BS EN 60068-2-75:1997 and BS EN 60068-2-75:2014

Probably over 1,000 specifications throughout the world now require the standard Spring Hammer, perhaps the best known being those for domestic appliances.

The Lansbury International Spring Impact Hammer is made to the working drawings as described in the above specifications and is calibrated and certified to be within the required limits of impact energy. The construction consists of a moving hammer head having a hard polyamide hemispherical face, mounted in a cylindrical body. A knob is attached to the rear of the hammer shaft for the purpose of compressing the hammer spring and setting the striking mechanism. The mechanism is released by applying pressure to the front nose cone. Blows to the sample under test are applied by pushing the release nose slowly against the sample until the release mechanism operates, allowing the spring to propel the hammer against the sample.

Hammers can be supplied with pre-set values of energy from 0.2J(Nm) to 1.0J(Nm). A very common value is, however, 0.5J(Nm) ± 0.04J(Nm), which is specified for the enclosures of most domestic electrical appliances and similar equipment. Each hammer is supplied complete with a UKAS certificate of calibration and contained in a wooden instrument case.

Lansbury International is a small company, which has been manufacturing, servicing and calibrating Spring Hammers (NAMAS/UKAS accredited since 1990) for well over thirty years on the same site.

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