Abstract:
An indicating instrument for visual reading includes a flat housing and at least one elongated straight scale extending along a narrow front side of the housing. A moving-coil instrument in the housing has a pointer whose tip is located in a plane making a right angle with the pointer axis and an acute angle with the front side of the housing. The tip is movable along the front side behind an elongated light-transmitting prism which permits direct observation of a portion of the tip and is provided with a mirrored surface which reflects the image of the tip toward the front side of the housing. An opaque edge face of the prism separates the reflected image from the directly observable portion of the tip.
Abstract:
An unbalanced coil assembly for use in moving-coil instruments comprises a frame which carries the coil, two coaxial staffs, a pointer and platelike balance weight. When the coil assembly is mounted for turning movement about the common axis of its staffs and when such axis is located in a horizontal plane, the balance weight is caused by gravity to move to a level below the staffs. This balance weight extends beyond the outline of the frame so that some of its material can be removed by one or more milling or like tools until the coil assembly is properly balanced.
Abstract:
The moving-coil assembly of a moving-coil electrical measuring instrument comprises two coaxial staffs extending into recesses provided in two stationary bearings and mounted on elastic sections of plastic carriers which are secured to the coilsupporting frame. The extent of flexing of the elastic sections is limited by stops provided on the carriers in such a way that the tips of staffs cannot leave their recesses when the sections are flexed in response to shocks and that the sections cannot contact the outermost windings of the coil which is convoluted around the frame.
Abstract:
A moving-coil instrument wherein the end positions of the pointer which shares oscillatory movements of the coil are determined by two elastic paper strips. The strips have inner portions which are received in slots provided therefor in a support which constitutes or includes the instrument housing, and outer portions having transversely extending edges which abut against the pointer when the latter assumes the corresponding end position. The strips are adjustable with reference to the support to facilitate calibration of the instrument and are thereupon bonded to the support.
Abstract:
An indicating instrument for use in radio or television receivers has one or two elongated prisms with an exposed surface, a mirrored surface and a further surface which is adjacent to the straight terminal of a pointer pivotable by a moving-coil instrument. The pivot axis of the pointer is parallel to the terminal and to the further surface of the prism. One or more scales are positioned in the housing of the indicating instrument in such a way that they are either directly observable by looking at the exposed surface of the prism or that the mirrored surface reflects their images toward the exposed surface, together with the image of the terminal which appears as a straight band and moves sideways in response to pivoting of the pointer.
Abstract:
A fully assembled moving coil assembly for use in D''Arsonval and like electrical measuring instruments includes a disk-shaped plastic balancing element which is integral with the pointer and with a portion of one of the bearing members and is formed with one or more annuli of equidistant bores for reception of pinshaped counterweights. The center of each annulus is located on the pivot axis of the moving coil assembly. One or more counterweights are inserted into and snugly received in selected bores after the assembly is tested in a suitable apparatus which determines the location of the unbalance.