US3736683A

US3736683A - Non-repetitive flashing display mechanism

Info

Publication number: US3736683A
Application number: US00118023A
Authority: US
Inventors: E Paquette
Original assignee: BJORKSTEM RESEARCH LABOR
Current assignee: BJORKSTEM RESEARCH LABOR; BJORKSTEM RESEARCH LABOR US
Priority date: 1971-02-23
Filing date: 1971-02-23
Publication date: 1973-06-05
Anticipated expiration: 1990-06-05

Abstract

An advertising display which simulates a firefly, comprising an unrepetitive or random motion device based on reciprocating means actuating a flexible rod carrying a flashing device, where the motion is distorted by means of an off vertical crank shaft.

Description

UIlitBd States Patent 1 UNITED STATES PATENTS 3,494,058 2 1970 Paquette...i ..40/I26B Pa uette [4 1 June 5 1973 [54] NON REPETITIVE FLASHING DISPLAY gearesnt emen MECHANISM 2,610,424 9/l952 Millard ..40/l39 [75] Inventor: Elmer G. Paquette, Madison, Wis. 2,714,266 8/1955 .lauquet ..40/l39 X [73] Assignee: B jorkstem Research Laboratories,

Inc., Madison, Wis. Primary Examiner-Robert W. Michell [22] Filed: Feb. 23 1971 Attorney-Johan Bjorksten [21] Appl. No.: 118,023 [57] ABSTRACT [52] U S Cl 40/126 B An advertising display which simulates a firefly, com- [51] In. .Cl 19/00 p g an repetitive or random motion device based 58 Field o''s'e'h'c'ii i Jib'ii'i'n 218 139 reciprocating means actuating flexible carrying a flashing device, where the motion is distorted by [56] References Cited means of an off vertical crank shaft.

7 Claims, 1 Drawing Figure BRIEF STATEMENT OF THE INVENTION In accordance with my invention I simulate a move ment of a firefly by a flashing light attached to a flexible wand. This is caused to move randomly by reciprocating rneans actuating a connecting link or arm by means of an off vertical crank pin, said connecting link having a distal opening through which an elastically flexible wand protrudes.

Referring now to FIG. 1, l is a bracket which holds the device and may be attached to a stand, a wall, or as maybe desired in each case. To this bracket is at tached by means of a clamp 2 a flexible wand 3 at the 1 end of which is a lamp 4 suitably, but not necessarily, made to flash by current interrupter not shown. 5 is a connecting link which has a distal opening 6 through which said flexible wand 3 protrudes. The opening 6 is at least by half the diameter and preferably between one and 10 diameters wider than the wand 3, the diam eters being diameters of said wand, so that there is ample play in the motion of said wand. The wand is propelled by means of a crank 7, attached to a motor shaft 8 (motor not shown) by means of a tilted crank in 9. p As a motor I prefer to employ a 24 rpm (maximum limits 12 to 36 rpm), clock type synchronous motor. The crank shaft pin has a /4 inch throw (offset on the motor shaft center limits 3/16 to 1 inch) and is bent off the vertical between 1 and 10, preferably between 2 and 5. By off vertical I mean the angle the crank shaft pin forms with a line perpendicular to the plane of the motion of the crank 7. Rubber grommet 10 is preferably used in the hole in the one end of the connecting link to reduce-noise and wear on the wand. The clearance between the flexible wand and the moving hole through which it moves is at least one-eighth inch.

The tilt of the crank pin serves two functions: 1) it applies displacement at varying heights on the wand, and (2) it tends to make the connecting link nontracking to a regular circular motion. The angle of the crank pin is determined by the length, flexibility and weight and balance of the wand, and the degree of gyration desired. The optimal height of the connecting link from the wands anchor point depends upon the wand characteristics and I have found this distance to be suitably one-half inch to l and b inch, though in some special cases it may be as low as one-fourth inch nnti as high as 3 inches. In the specific case illustrated in this application, it was I inch .9. A inch.

Even though a nondirectionall motor will work, a more random motion is generated when the motor ro tation (cw, cow) is matched to the spiral or winding direction of the spring forming the flexible part of the wand. Ideal flashing time for display purposes is 30 cycles per minute, one second on and one second off. The maximum limits are 3 and 500 flashes a minute. This flashing can be controlled by electronic flip-flop or transistor circuits, or by mechanical switching.

The wand may be constructed of a coiled steel spring, resilient plastic such as a polyoxymethylene, glass or other suitable material with a property of bending at each change in direction so that its main arc will be at least twice as great as it would be with the wand inflexible. Wand flexibility and balance are defined, in general, by the ability of the wand to be barely self-erecting in absence of displacement forces.

The flashing light can, for example, be an incandescent or neon bulb, or any other light source which is electrically activated and of sufficient illuminosity.

While a bracket has been shown, the device can also be housed in an enclosure of any structure or plastic, glass or any other suitable material.

Having thus disclosed my invention, I claim:

1. A non-repetitive random motion display device for simulating a firefly comprising: an elongated flexible elastic wand, a lamp disposed on one end of said wand, a rotating crank means, said crank means having an off vertical crank pin mounted thereon, an elongated connecting link, an opening disposed at one end'of said link and having said crank pin mounted therein, the opposite end of said link having an opening through which the opposite end of said wand protrudes, the clearance between the sides of said opposite end opening and said wand being at least one-eighth inch so as to permit random motion of said wand within said opposite end opening and thereby simulate a firefly.

2. The random motion device of claim I, in which the said crank pin has at least a A inch throw.

3. The random motion device of claim 2, in which the throw of the said crank pin is between 3/16 inch and 1 inch.

4. The random motion device of claim 1, in which the said crank pin has an angle with the plane of motion of the crank means at least 2 to 5 off the perpendicular.

5. The device of claim 4, in which the said angle is between 1 and 10. 1

6. The random motion device of claim 1, in which the crank means has a rotational speed between 12 and 36 rpm.

7. The random motion device ofclaim 1, inwhich the throw of said crank pin is between 3/ 16 inch and 1 inch, the rotational speed of said crank means between 12 and 36 rpm, a line perpendicular to the plane of the crank forms an angle between 1 and 10 with the crank pin, and the clearance between the sides of said opposite end opening and said wand is between rt; inch and 3inches.

Claims

1. A non-repetitive random motion display device for simulating a firefly comprising: an elongated flexible elastic wand, a lamp disposed on one end of said wand, a rotating crank means, said crank means having an off vertical crank pin mounted thereon, an elongated connecting link, an opening disposed at one end of said link and having said crank pin mounted therein, the opposite end of said link having an opening through which the opposite end of said wand protrudes, the clearance between the sides of said opposite end opening and said wand being at least one-eighth inch so as to permit random motion of said wand within said opposite end opening and thereby simulate a firefly.

2. The random motion device of claim 1, in which the said crank pin has at least a 1/4 inch throw.

4. The random motion device of claim 1, in which the said crank pin has an angle with the plane of motion of the crank means at least 2* to 5* off the perpendicular.

5. The device of claim 4, in which the said angle is between 1* and 10*.

7. The random motion device of claim 1, in which the throw of said crank pin is between 3/16 inch and 1 inch, the rotational speed of said crank means between 12 and 36 rpm, a line perpendicular to the plane of the crank forms an angle between 1* and 10* with the crank pin, and the clearance between the sides of said opposite end opening and said wand is between 1/8 inch and 3 inches.