Teaching device

• US 6,652,286 B1
• Filed: 06/13/2002
• Issued: 11/25/2003
• Est. Priority Date: 06/13/2002
• Status: Expired due to Fees

• Current Assignee: Timmy L. Larsen
• Original Assignee: Timmy L. Larsen
• Inventors: Larsen, Timmy L.
• Primary Examiner(s): Banks, Derris H.
• Assistant Examiner(s): Suhol, Dmitry
• Application Number:
  US10/171,115
• Time in Patent Office: 530 Days
• Field of Search: 434/348, 434/324, 353/27.R, 404/92
• US Class Current: 434/348
• CPC Class Codes: G09B 1/02 and having a support carrying or adapted to carry the elements
• CPC Class Codes: G09B 19/02 Counting; Calculating abacus G06C1/00

Abstract

A teaching device is provided for use with an overhead projector to display educational problems to a group of students. The solutions to the problems are selectively concealed and revealed by the teacher through the use of a solution cover. A plurality of embodiments is provided disclosing different methods of moving the solution cover between concealing and revealing positions. The teaching device is adaptable for use with different types of overhead projectors as needed.

Claims

1. In combination with an overhead projection device, a teaching device, comprising:

a plurality of sheet members having first and second side portions and first and second end portions;

a plurality of printed problems;

only one of said plurality of problems being disposed on each of said sheet members;

a plurality of printed solutions;

only one of said plurality of solutions disposed on each of said sheet members;

a plurality of first and second spaced-apart rail members connected to the first and second side portions of each of said sheet members; and

a plurality of solution covers;

only one of said plurality of solution covers being connected to each of said first rail members and positioned adjacent said solution to selectively prevent said solution from being optically received and projected by the overhead projection device while permitting said problem to be optically received and projected by the overhead projection device.

2. The combination of claim 1 wherein said solution covers are operatively hingedly connected to said first rail members so that said solution covers can be selectively moved between concealed and revealing positions with respect to said solutions.

3. The combination of claim 1 further comprising a plurality of pins;

only one of said plurality of pins being connected to each of said first rail members;

said solution covers being operatively pivotably connected to said pins so that said solution covers can be selectively moved between concealed and revealing positions with respect to said solutions.

4. The combination of claim 1 wherein each of said plurality of solution covers are operatively slidably connected to a pair of said plurality of first and second spaced-apart rails so that each of said plurality of solution covers can be selectively moved in a direction that is generally parallel with said pair of first and second spaced-apart rails.

5. The combination of claim 4 wherein said each of said plurality of solution covers are selectively movable along said pair of first and second spaced-apart rails between the first and second end portions of one of said plurality of sheet members.

6. The combination of claim 4 wherein each of said plurality of solution covers are selectively movable along said pair of first and second spaced-apart rails and at least partially beyond one of the first and second end portions of one of said plurality of sheet members.

7. The combination of claim 1 wherein each of said plurality of solution covers are operatively slidably connected to one of said plurality of first and second spaced-apart rails so that each of said plurality of solution covers can be selectively moved in a generally perpendicularly direction with respect to said first and second spaced-apart rails.

8. The combination of claim 1 wherein said plurality of sheet members are generally transparent.