| 摘要 |
A miniature spindle potentiometer for disturbance-free operation adjacent and generally parallel to adjacent similar potentiometers has a small-area profile of narrow width approaching the profile and width of its spindle. It is composed of simple components which may be rapidly assembled into complete potentiometers. The potentiometer has a special slotted nut having two nut sections of strong elastic and insulating polymer material which are biased into play-free threaded engagement with a rotatable spindle which moves the nut and a contact spring coupled thereto along the spindle. Elongated resistance and contact tracks extending generally parallel to the spindle and transversely to the potentiometer mounting surface are slidingly engaged by the moving contact spring. The elastic material of the slotted nut causes the nut and spindle threads to glide across and over their engaged threads without damage and wear of the nut threads, even while the nut remains stationary in an end position while the spindle continues to rotate at substantial speed. A U-shaped contact spring has two contact arms which contact the parallel resistance and contact tracks, respectively, and its sheet junction section is coupled to the moving nut by interfitting coupling projections and recesses. Thus, the nut has at least one pin projection which enters into a corresponding recess or opening in the sheet junction section of the U-shaped contact spring. All components are of simple shape which make possible their rapid production and assembly on a mass production basis into completed potentiometers. The slotted nut of elastic material enables assembly of all potentiometer components except the spindle within a plastic polymer housing. The threaded spindle is thereafter inserted into the housing and into threaded engagement with the inwardly biased threads of the slot-separated nut sections. The exterior end of the spindle which passes through a passage in a transverse housing wall is surrounded by a housing extension which forms with this exterior spindle end a labyrinthine packing which suppresses entry of dust and other contaminants into the housing interior. |
