| 摘要 |
Improvements to the construction of casings with internal devices for application to closure elements, consisting of the construction of a rectangle prismatic box, in injected mould, with its front and upper faces open, in which provision is made at both inner ends for square blocks which occupy the upper half of each end, there being in one of them a cylindrical housing, in the upper zone, extending downwards, being closed by a similar double partition in the centre thereof. The opposite block leaves underneath it a prismatic housing with engagement grooves for a contact carrier piece made from insulating material. In the mid upper zone of the front inner face are specially shaped cavities for engagement of the closure-operation elements, and in the lower one a housing for an electromagnetic coil in the longitudinal direction. All the elements for articulation, securing and location of the internal devices are formed by suitable projections and recesses, eliminating any type of auxiliary securing means.
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