US4213253A — Electronic teaching and testing device

Claim 1

Independent Claim 265 words

A portable, self-contained, dual function electronic instrumentation device for teaching the principles of electricity and electronics and as a laboratory test instrument for testing electrical systems, comprising: a housing; control, display and terminal elements extending externally of said housing; electrical circuit means arranged within said housing and electrically coupled to said control, display and terminal elements for transmitting electrical signals thereto; said housing having an exterior surface with at least some of said control, display and terminal elements extending outwardly therefrom, said exterior surface having a movable portion and a fixed portion; said movable portion being mechanically coupled to a normally concealed display surface having second display and control elements so that said display surface is exposed when said movable portion is moved relative to said fixed portion; said display surface having a receptacle with circuit card receiving means thereon for direct electrical coupling to a circuit card without the use of conductive wires when said display surface is exposed; said control, display and terminal elements of said housing with said second display elements, said second control elements and said receptacle of said display surface being interconnected with said electrical circuit means so that when said display surface and receptacle is concealed, electrical devices may be tested by electrically coupling an electrical device to said terminal elements by means of external conductive leads, and when said display surface and receptacle is exposed, a circuit card may be electrically coupled to said receptacle for teaching the principles of electricity and electronics by way of the various display and control elements without use of external conductive leads.

Claim 2

Dependent Claim 265 words

A portable, self-contained, dual function electronic instrumentation device for teaching the principles of electricity and electronics and as a laboratory test instrument for testing electrical systems, comprising: a housing; control, display and terminal elements extending externally of said housing; electrical circuit means arranged within said housing and electrically coupled to said control, display and terminal elements for transmitting electrical signals thereto; said housing having an exterior surface with at least some of said control, display and terminal elements extending outwardly therefrom, said exterior surface having a movable portion and a fixed portion; said movable portion being mechanically coupled to a normally concealed display surface having second display and control elements so that said display surface is exposed when said movable portion is moved relative to said fixed portion; said display surface having a receptacle with circuit card receiving means thereon for direct electrical coupling to a circuit card without the use of conductive wires when said display surface is exposed; said control, display and terminal elements of said housing with said second display elements, said second control elements and said receptacle of said display surface being interconnected with said electrical circuit means so that when said display surface and receptacle is concealed, electrical devices may be tested by electrically coupling an electrical device to said terminal elements by means of external conductive leads, and when said display surface and receptacle is exposed, a circuit card may be electrically coupled to said receptacle for teaching the principles of electricity and electronics by way of the various display and control elements without use of external conductive leads.

Claim 3

Dependent Claim 44 words

The device as recited in claim 1, wherein: said movable first portion is the exterior surface of a drawer, said drawer being slidably arranged to move from a closed position within the housing to an open position to expose said display surface and receptacle.

Claim 4

Dependent Claim 24 words

The device as recited in claim 1, wherein said display surface includes additional terminal elements interconnected with said electrical circuit means and said receptacle.

Claim 5

Dependent Claim 215 words

In a portable, self-contained, electronic instrumentation device for teaching the principles of electricity and electronics having a housing enclosing electrical circuit means therein and control, display and terminal elements extending externally of the housing, the improvement wherein the housing is divided into a first and second portion, said first portion being fixed in place and the second portion forming a drawer for slidably moving from a closed position to an open position relative to said first portion, said drawer having a work surface which is concealed when said drawer is closed and exposed when said drawer is opened, said work surface of said drawer having second control and display elements and a receptacle adapted for receiving a plug-in circuit card therein, the control, display and terminal elements of the housing with said second control and display elements and said receptacle of said work surface being interconnected with the electrical circuit means for testing circuits provided on the circuit card plugged into said receptacle without the use of external conductive leads when said work surface is exposed, and said exterally extending control and display being adapted to test electrical devices coupled to the terminal elements of said housing with the use of external conductive leads when said drawer is closed and said work surface is concealed.

Claim 6

Dependent Claim 215 words

In a portable, self-contained, electronic instrumentation device for teaching the principles of electricity and electronics having a housing enclosing electrical circuit means therein and control, display and terminal elements extending externally of the housing, the improvement wherein the housing is divided into a first and second portion, said first portion being fixed in place and the second portion forming a drawer for slidably moving from a closed position to an open position relative to said first portion, said drawer having a work surface which is concealed when said drawer is closed and exposed when said drawer is opened, said work surface of said drawer having second control and display elements and a receptacle adapted for receiving a plug-in circuit card therein, the control, display and terminal elements of the housing with said second control and display elements and said receptacle of said work surface being interconnected with the electrical circuit means for testing circuits provided on the circuit card plugged into said receptacle without the use of external conductive leads when said work surface is exposed, and said exterally extending control and display being adapted to test electrical devices coupled to the terminal elements of said housing with the use of external conductive leads when said drawer is closed and said work surface is concealed.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1983-07-22	1984-01-21	1984-07-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1987-07-22	1988-01-21	1988-07-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1991-07-22	1992-01-21	1992-07-22	$7700.00	Window Closed / Lapsed

Electronic teaching and testing device

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