Method of incorporating wide tolerance set point potentiometers into devices with fixed orientation setpoint indicator scales
First Claim
1. A method of incorporating potentiometers having substantially linear resistance characteristics within a range of wiper positions, the resistance characteristics other than linearity being subject to unit-to-unit variations, into devices of the type in which the set point for a controlled parameter is determined by the position of the wiper on the resistance element of a potentiometer, and in which a movable element coupled to a wiper positioning member cooperates with a fixed-position element to indicate the set point, one of the movable and fixed-position elements being a scale, a further requirement being that a first predetermined indicium of the fixed-position element occupies substantially the same desired location on the device, from device-to-device, the method comprising the steps of:
- determining a first wiper position at which the parameter is controlled to a first set point corresponding to the first predetermined indicium on the scale;
coupling the wiper positioning member to the potentiometer so that a movable element associated with the wiper positioning member is in a desired positional relationship with stationary parts of the device when the wiper is positioned to control the parameter to the set point corresponding to a first predetermined indicium on the scale; and
marking the scale so that the first predetermined indicium thereon is at the desired location.
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Accused Products
Abstract
A manufacturing method for control devices which incorporate potentiometers whose resistance characteristics other than linearity are subject to unit-to-unit variations, and in which a wiper positioning knob in cooperation with a fixed scale indicates the set point for the controlled parameter, the method involving mounting the potentiometer in its theoretically ideal orientation in the device, affixing the knob to the potentiometer so that a pointer thereon points to the desired location on the device for a predetermined point on the scale when the wiper is positioned to control the parameter to the set point corresponding to the predetermined point on the scale, and marking the scale on the device so that the predetermined point on the scale is at its desired location on the device.
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Citations
9 Claims
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1. A method of incorporating potentiometers having substantially linear resistance characteristics within a range of wiper positions, the resistance characteristics other than linearity being subject to unit-to-unit variations, into devices of the type in which the set point for a controlled parameter is determined by the position of the wiper on the resistance element of a potentiometer, and in which a movable element coupled to a wiper positioning member cooperates with a fixed-position element to indicate the set point, one of the movable and fixed-position elements being a scale, a further requirement being that a first predetermined indicium of the fixed-position element occupies substantially the same desired location on the device, from device-to-device, the method comprising the steps of:
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determining a first wiper position at which the parameter is controlled to a first set point corresponding to the first predetermined indicium on the scale; coupling the wiper positioning member to the potentiometer so that a movable element associated with the wiper positioning member is in a desired positional relationship with stationary parts of the device when the wiper is positioned to control the parameter to the set point corresponding to a first predetermined indicium on the scale; and marking the scale so that the first predetermined indicium thereon is at the desired location. - View Dependent Claims (2, 3, 4)
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5. In a control device of the type in which a controlled parameter set point is determined by the position of a wiper on a resistive element of a potentiometer, and in which the set point is indicated by a pointer on a wiper positioning member in cooperation with a fixed scale on the device, a method of marking the scale on the device in a desired orientation relative thereto, comprising the steps of:
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mounting the potentiometer in the device in the orientation which would be consistent with the desired orientation of the scale, assuming ideal resistance characteristics of the potentiometer; affixing the wiper positioning member to the potentiometer so that the pointer on said member points to the desired location of a first predetermined point on the scale when the wiper is positioned to provide the set point corresponding to said first predetermined point; and marking the scale on the device so that said first predetermined point on the scale is at the desired location. - View Dependent Claims (6, 7, 8, 9)
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Specification