Foot operated control system for a multi-function device

• US 5,422,521 A
• Filed: 11/18/1993
• Issued: 06/06/1995
• Est. Priority Date: 11/18/1993
• Status: Expired due to Term

• Current Assignee: Liebel-Flarsheim Company (Mallinckrodt plc)
• Original Assignee: Liebel-Flarsheim Company (Mallinckrodt plc)
• Inventors: Fago, Frank, Watkins, Marvin, Neer, Charlie
• Primary Examiner(s): SCOTT, JAMES R
• Application Number:
  US08/154,745
• Time in Patent Office: 565 Days
• Field of Search: 200/86.5, 200/61.89, 74/512, 74/560, 338/32 H, 338/200, 345/157, 364/413.01, 364/413.28, 433/28, 433/68, 433/72.75, 433/98, 433/101, 433/128, 307/112, 307/115, 307/116, 307/119
• US Class Current: 307/119
• CPC Class Codes: A61C 1/0023 Foot control
• CPC Class Codes: A61G 15/02 Chairs with means to adjust position of patient; Controls therefor
• CPC Class Codes: H01H 3/14 adapted for operation by a part of the human body other than the hand, e.g. by foot

Abstract

A foot-operated control system for use with a multi-function device includes a movable foot control device, one embodiment of the device comprising a pedal mounted on a base to pivot azimuthally with respect to the base and also downwardly in elevation with respect to the base. When the pedal is pivoted in azimuth, the foot control device provides selection signals to a selector including a function menu. The selector in turn, selects a menu segment from the function menu which corresponds to the desired function of the multi-function device. Pivoting the pedal to the left or to the right moves a menu indicator or icon through the various menu segments until the indicator indicates the segment corresponding to the desired function as indicated. The foot pedal is then returned to a central position and is moved in elevation to actuate the multi-function device to perform the selected function. Other foot-control devices besides the foot pedal device might be utilized with the control system to select and actuate a chosen function.

Claims

1. A foot-operated control device adapted to be connected to a multi-function device to select and actuate the functions of the multi-function device, the control device comprising:

a base with a front end, a rear end, a left side, and a right side;

a foot pedal mounted for azimuthal lateral movement on said base, the foot pedal being mounted for azimuthal lateral movement between a central position and a leftmost position overlying said left side of said base and spaced laterally from said central position and a rightmost position overlying said right side of said base and spaced laterally from said central position;

said foot pedal also being mounted for elevational movement about a horizontal axis mounted to said base, the foot pedal movable about said horizontal base axis between an elevational up position in which a front end of said pedal is at an elevational position above the elevational position of a rear end of said pedal and an elevational down position in which the front end of said pedal is at an elevational position approximately equal to or below the elevational position of the rear end of said pedal;

a first switch located generally on the left side of the base, the first switch being actuated by said pedal in the elevational up position when the pedal is moved azimuthally from said central position to said leftmost position, said actuated first switch producing a first selection signal for selecting a first function of the multi-function device;

a second switch located generally on the right side of the base, the second switch being actuated by said pedal in the elevational up position when the pedal is moved azimuthally from said central position to said rightmost position, said actuated second switch producing a second selection signal for selecting a second function of the multi-function device;

a third switch, the third switch being actuated by said pedal in the central position when the pedal is moved to the elevational down position while in its central position, said actuated third switch producing an activation signal for activating the device, to perform the selected function.

2. The foot-operated control device of claim 1 further comprising an elevational movement inhibitor to prevent the foot pedal from being moved from the elevational up position to the elevational down position when the pedal is moved away from the central position to one of said leftmost and rightmost positions.

3. The foot-operated control device of claim 2 wherein the elevational movement inhibitor comprises a hump section projecting generally vertically from one of the base and the foot pedal, and a generally vertical channel formed in the other one of the base and the foot pedal to receive said hump section when the pedal is in its central position to allow the pedal to be moved to the elevational down position in said central position, the hump section projecting vertically against the pedal when the pedal is at one of the rightmost and leftmost positions to prevent the pedal from being moved to the elevational down position when it is in one of said rightmost and leftmost positions.

4. The foot-operated control device of claim 1 wherein the first, second and third switches each include a magnetic sensor which is operable to activate the respective switch in the presence of a magnetic element, the control device further comprising:

at least one magnetic element mounted on the pedal to be proximate the respective magnetic sensor of one of said first, second, and third switches when the pedal is moved to one of the leftmost position, rightmost position, and elevational down position, respectively, thereby to activate the switch.

5. The foot-operated control device of claim 1, further comprising a yoke coupled to said base, said yoke being elevationally pivotable generally about said horizontal base axis, the pedal pivotally mounted to said yoke to azimuthally pivot on a generally vertical axis with respect to the yoke, wherein the pedal pivots in azimuth and pivots in elevation with respect to said base.

6. The foot-operated control device of claim 1, the pedal being biased to return to said central position when the pedal is not being moved to the left most position or right most position by a user'"'"'s foot.

7. The foot-operated control device in claim 1, the device being configured such that the pedal returns to the elevational up position when no downward force is applied to said pedal by a user.

8. A foot-operated control system for controlling and operating a multi-function device with the foot, the system comprising:

a selector circuit which is electrically couplable to a multi-function device and is operable for selecting one of at least two functions to be performed by the multi-function device in response to a selection input and is further operable to actuate a multi-function device when such a device is coupled thereto to perform the selected function in response to an actuation input;

a foot-operated control device electrically coupled to the selector circuit, the control device operable to generate said selection and actuation inputs to be electrically input to the selector circuit for controlling a multi-function device, the foot-operated control device comprising;

a base with a front end, a rear end, a left side and a right side;

a foot pedal mounted to move on said base for generating all of said selection and actuation inputs, the foot pedal being mounted for azimuthal lateral movement between a central position and a leftmost position overlying said left side of said base and spaced laterally from said central position and a rightmost position overlying said right side of said base and spaced laterally from said central position,

said pedal also being mounted for elevational movement about a horizontal axis mounted to said base, the pedal movable about said horizontal base axis between an elevational up position in which a front end of said pedal is at an elevational position above the elevational position of a rear end of said pedal and an elevational down position in which the front end of said pedal is at an elevational position approximately equal to or below the elevational position of the rear end of said pedal;

an electrical sensor system carried by said base and including signal generating circuits which are responsive to the azimuthal lateral movement of said pedal and are operable to generate a first selection input when the pedal is moved to the leftmost position and a second selection input when the pedal is moved to the rightmost position, the selector circuit operable for receiving said selection inputs and selecting a first function and second function in response to said first selection input and second selection input, respectively;

the signal generating circuits of said sensor system further responsive to elevational movement of the pedal into the elevational down position in the central position and further operable to generate an actuation input, the selector circuit operable for receiving said actuation input and actuating a multi-function device coupled thereto to perform the selected function.

9. The foot-operated control system of claim 8 wherein the electrical sensor system comprises:

a plurality of proximity switches coupled between the pedal and base, the switches being responsive to the location of the pedal with respect to the base to generate said selection and actuation inputs, the plurality of switches including;

a first proximity switch located generally on the left side of the base for generating said first selection input when the pedal is moved azimuthally from the central position to the leftmost position in the elevational up position;

a second proximity switch located generally on the right side of the base for generating said second selection input when the pedal is moved azimuthally from the central position to the rightmost position in the elevational up position; and

a third proximity switch located generally in the center of said base for generating said actuation input when the pedal is moved into the elevational down position while in the central position.

10. The foot-operated control system of claim 8 wherein at least three functions may be selected, the system further comprising a function menu electrically coupled to said selector circuit which includes a plurality of visually selectable menu segments, each segment corresponding to a selectable function of a multi-function device, and a visual indicator generated by said selector circuit, said selector circuit operable for visually moving the visual indicator through the selectable menu segments and visually indicating the menu segments and corresponding functions available for selection, the indicator moving in response to said selection inputs;

the selector circuit being responsive to said first selection input to move indicator in discrete, visually-perceptible steps through the segments of the function menu in one direction and responsive to said second selection input to move the indicator in discrete, visually-perceptible steps through the menu segments in another direction, the device function being selected by returning the foot pedal to the central position and stopping movement of the visual indicator when the indicator indicates the desired menu segment, whereafter the function of the selected menu segment is actuated by moving said foot pedal to the elevational down position while in the central position to generate an actuation input.

11. The foot-operated control system of claim 10, the function menu including a translucent plate containing a plurality of individual visual symbols which constitute individual menu segments, each symbol visually indicating a particular selectable function of a multi-function device, the visual indicator including an illumination device to illuminate the translucent plate proximate the chosen symbol and thereby visually indicate which function of the multi-function device has been selected.

12. The foot-operated control system of claim 10 wherein the selector circuit is operable for moving the indicator in discrete, visually-perceptible steps rapidly through the menu segments in the direction corresponding to the pedal position when the foot pedal is maintained in one of its leftmost and rightmost positions for a predetermined amount of time to continuously generate said first and second selection inputs, respectively and thereby scroll the indicator through the menu.

13. The foot-operated control system of claim 8, the foot pedal being biased to return to said central position when the pedal is not being moved to one of the leftmost and rightmost positions by a user'"'"'s foot.

14. The foot-operated control system of claim 8, the foot pedal mounted to said base such that the pedal returns to the elevational up position when no downward force is applied to said pedal by a user'"'"'s foot.

15. The foot-operated control system of claim 8, the foot-operated control device further comprising an elevational movement inhibitor to prevent the foot pedal from being moved from the elevational up position to the elevational down position when the pedal is moved away from the central position to one of said leftmost and rightmost positions.

16. A multi-function device capable of performing a plurality of different selectable functions and including at least one mechanical structure operable to execute the selected functions, the device comprising:

a selector circuit operable for selecting one of the plurality of functions of the multi-function device in response to a selection input, the selector circuit further operable for generating a command signal corresponding to a selected function to initiate operation of the mechanical structure of the multi-function device to perform the selected function in response to an actuation input;

a signal receiving circuit electrically coupled to said selector and said mechanical structure, the signal receiving circuit operable for receiving said command signal from the selector circuit and controlling the mechanical structure to execute a selected mechanical function;

a foot-operated control device electrically coupled to the selector circuit, the control device operable for generating said selection and actuation inputs to be electrically input to said selector circuit, the control device comprising;

a base with a front end, a rear end, a left side and a right side;

a foot pedal mounted to move on said base for generating all of said selection end actuation inputs, the foot pedal being mounted for azimuthal lateral movement between a central position and a leftmost position overlying said left side of said base and spaced laterally from said central position and a rightmost position overlying said right side of said base and spaced laterally from said central position,

said pedal also being mounted for elevational movement about a horizontal axis mounted to said base, the pedal operable about said horizontal base axis between an elevational up position in which a front end of said pedal is at an elevational position above the elevational position of a rear end of said pedal and an elevational down position in which the front end of said pedal is at an elevational position approximately equal to or below the elevational position of the rear end of said pedal;

an electrical sensor system carried by said base and including signal generating circuits which are responsive to the azimuthal lateral movement of said pedal and are operable to generate a first selection input when the pedal is moved to the leftmost position and a second selection input when the pedal is moved to the rightmost position, the selector circuit operable for receiving said selection inputs and selecting a first function and second function in response to said first selection input and second selection input, respectively;

the signal generating circuit of said sensor system further responsive to elevational movement of the pedal into the elevational down position in the central position and further operable to generate an actuation input, the selector circuit operable for receiving said actuation input and generaing a command signal for the signal receiving circuit for actuating the multi-function device to perform the selected function.

17. The multi-function device of claim 16, further comprising a function menu electrically coupled to said selector circuit which includes a plurality of visually selectable menu segments, each segment corresponding to a selectable function of a multi-function device, and a visual indicator generated by said selector circuit, said selector circuit operable for visually moving the visual indicator through the selectable menu segments and visually indicating menu segments and corresponding functions available for selection, the selector circuit moving said indicator in response to said selection inputs;

the selector circuit being responsive to said first selection input to move the indicator in discrete visually-perceptible steps through the segments of the function menu in one direction and responsive to said second selection input to move the indicator in discrete, visually-perceptible steps through the menu segments in another direction, the device function being selected by returning the foot pedal to the central position and stopping movement of the visual indicator when the indicator indicates the desired menu segment, whereafter the function of the selected menu segment is actuated by moving said foot pedal to the elevational down position while in the central position to generate an actuation input.

18. The multi-function device of claim 17, the function menu including a translucent plate containing a plurality of individual visual symbols which constitute individual menu segments, each symbol visually indicating a particular selectable function of the multi-function device, the visual indicator including an illumination device to illuminate the translucent plate proximate the chosen symbol and thereby visually indicate which function of the multi-function device has been selected.