Electric lantern with oscillating feature

• US 4,797,796 A
• Filed: 11/09/1987
• Issued: 01/10/1989
• Est. Priority Date: 11/09/1987
• Status: Expired due to Fees

• Current Assignee: Lightech International, LLC
• Original Assignee: L Kent Eastman Company Incorporated
• Inventors: Eastman, Lewis K. II, Bromley, Robert L.
• Primary Examiner(s): Husar, Stephen F.
• Application Number:
  US07/118,607
• Time in Patent Office: 428 Days
• Field of Search: 362/199, 362/269, 362/271, 362/272, 362/286, 362/287, 362/386, 362/427, 362/428
• US Class Current: 362/199
• CPC Class Codes: F21L 4/00 Electric lighting devices with self-contained electric batteries or cells
• CPC Class Codes: F21S 10/06 flashing, e.g. with rotating reflector or light source signalling lighting devices mounted on vehicles B60Q1/26
• CPC Class Codes: F21V 21/15 specially adapted for power operation, e.g. by remote control
• CPC Class Codes: F21V 21/30 Pivoted housings or frames

Abstract

The present invention concerns an electric lantern preferably of the flashlight type. The lantern uses batteries for a power source, and a switch for selectively activating the lantern. The lantern also has an optical system which includes a bulb and reflector for directing the light in a relatively narrow beam of light. A motor contained in the lantern is used to bring about oscillating movement of the bulb and reflector. This oscillating movement is activated by the switch which can be selectively operated to cause the beam of light to scan a wide, horizontal area. Alternatively, the switch can be activated to power the lamp bulb only-as in a conventional flashlight.

Claims

1. An electric lantern comprising an optical system for projecting a beam of light, an energy source, a switch operated by the operator of said lantern for selectively connecting said energy source to said optical system, means for oscillating said optical system, and means for selectively activating said oscillating means whereby said means for oscillating, when activated, causes said beam to scan back and forth at oscillation frequencies such that illumination of a relatively wide swath appears to the operator of said electric lantern to be continuous, whereby said beam can be made to illuminate said relatively wide swath.

2. An electric lantern of claim 1 wherein said optical system includes a light bulb.

3. An electric lantern of claim 1 wherein said optical system includes a reflector.

4. An electric lantern of claim 1 wherein said optical system includes a light bulb and reflector.

5. An electric lantern of claim 1 wherein said means for selectively activating said oscillating system includes said switch.

6. An electric lantern of claim 1 wherein said oscillating means includes a motor.

7. An electric lantern comprising an optical system for projecting a beam of light, an energy source, a switch for selectively connecting said energy source to said optical system, means for oscillating said optical system, and means for selectively activating said oscillating means whereby said means for oscillating, when activated, causes said beam to scan back and forth, whereby said beam can be made to illuminate a relatively wide swath wherein said oscillating means includes a first magnet attached to said optical system and means for applying a varying magnetic force to said first magnet whereby said optical system, together with said first magnet, is caused to oscillate in response to said varying magnetic force.

8. An electric lantern of claim 7 wherein said oscillating means includes an electric motor, a rotatable disc mounted on a shaft of said motor, and said means for applying said varying magnetic force comprises a second magnet mounted on said disc a distance from the shaft of said motor, said motor being positioned approximate said optical system so that said second magnet is brought in varying proximity to said first magnet on said optical system.

9. An electric lantern comprising an optical system for projecting a beam of light, an energy source, a switch for selectively connecting said energy source to said optical system, means for oscillating said optical system, and means for selectively activating said oscillating means whereby said means for oscillating, when activated, causes said beam to scan back and forth, whereby said beam can be made to illuminate a relatively wide swath and wherein said means for selectively activating said oscillating system includes said switch, said switch has at least three positions including a first position, a second position wherein said optical system is energized to provide a beam of light, and a third position wherein said optical system is energized to provide a beam of light and said means for oscillating is also energized.

10. An electric lantern of claim 9 further including means for preventing movement of said optical system relative to the rest of said lantern when said means for oscillating is not energized.

11. An electric lantern of claim 10 wherein said means for preventing movement comprises a first portion mounted for movement with said switch, and a mating portion carried by said optical system, said first portion engaging said mating portion when said switch is in said first and said second positions, and said first portion disengaging said mating portion when said switch is in said third position.

12. An electric lantern comprising an optical system for projecting a beam of light, an energy source, a switch for selectively connecting said energy source to said optical system, means for oscillating said optical system, and means for selectively activating said oscillating means whereby said means for oscillating, when activated, causes said beam to scan back and forth, whereby said beam can be made to illuminate a relatively wide swath and wherein said oscillating means oscillates said optical system at a frequency at which the stroboscopic effect caused by said oscillating is minimized.

13. An electric lantern of claim 12 wherein said oscillating means oscillates said optical system at a frequency of at least about 12 cycles per second.

14. An electric lantern of claim 12 wherein said oscillating means oscillates said optical system at a frequency of about 17 cycles per second.

15. An electric lantern comprising an optical system for projecting a beam of light, an energy source, a switch for selectively connecting said energy source to said optical system, means for oscillating said optical system, and means for selectively activating said oscillating means whereby said means for oscillating, when activated, causes said beam to scan back and forth, whereby said beam can be made to illuminate a relatively wide swath and wherein said means for selectively activating said oscillating system includes said switch, including means for preventing movement of said optical system relative to the rest of said lantern when said means for oscillating is not energized comprising a first portion mounted for movement with said switch, and a mating portion carried by said optical system.

16. A hand held lantern comprising a housing having a rear housing portion containing at least one battery, a front housing portion containing an optical system for projecting a narrow beam of light therefrom when electrically energized by said batteries, means for mounting said optical system for pivotal movement relative to said housing, a switch mounted to said housing for operation by a person carrying said lantern, means for oscillating said optical system when energized by said switch whereby said optical system is pivoted back and forth on said means for mounting, means for maintaining said optical system in a centered position relative to said housing when said means for oscillating is not energized by said switch.

17. A hand held lantern as set forth in claim 16 wherein said means for mounting comprises an electrical contact mounted on an upwardly facing surface of said optical system, another electrical contact mounted on a downwardly facing surface of said optical system, pins mounted to an inside surface of said housing, said pins being electrically connected to said battery and to said switch, said pins being positioned to engage said electrical contact, whereby said optical system pivots about said pins and electrical contact is made to said optical system while oscillating.

18. A hand held lantern as set forth in claim 16 wherein said means for maintaining said optical system in a centered position comprises a first part carried for movement with said switch, and a second part carried by said optical system, said first part engaging said second part when said switch is operated to energize only said optical system, and said first part disengages said second part when said switch is operated to energize said means for oscillating.

19. A hand held lantern as set forth in claim 16 wherein said switch has three operative positions, a first position in which said means for maintaining said optical system centers said optical system and prevents said optical system from pivoting relative to said housing, a second position in which said optical system is energized whereby a narrow beam of light from said optical system is produced in the manner of a conventional flashlight type of hand held lantern, and a third position is which both said optical system and said means for oscillating are energized whereby the beam of light produced by said optical system scans a wide, horizontal area.

20. A hand held lantern as set forth in claim 16 wherein said oscillating means includes a first magnet attached to said optical system and means for applying a varying magnetic force to said first magnet whereby said optical system, together with said first magnet, is caused to oscillate in response to said varying magnetic force.

21. A hand held lantern as set forth in claim 20 wherein said oscillating means includes an electric motor, a rotatable disc mounted on a shaft of said motor, and said means for applying said varying magnetic force comprises a second magnet mounted on said disc a distance from the shaft of said motor, said motor being positioned approximate said optical system so that said second magnet is brought in varying proximity to said first magnet on said optical system.