Protecting device of a desk lamp

• US 6,113,250 A
• Filed: 11/02/1998
• Issued: 09/05/2000
• Est. Priority Date: 10/27/1998
• Status: Expired due to Fees

• Current Assignee: Jack Lin
• Original Assignee: Jack Lin
• Inventors: Lin, Jack
• Primary Examiner(s): Sember, Thomas M.
• Application Number:
  US09/184,554
• Time in Patent Office: 673 Days
• Field of Search: 362/413, 362/414, 362/287, 362/427, 362/419, 362/263
• US Class Current: 362/287
• CPC Class Codes: F21S 6/003 for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
• CPC Class Codes: F21V 21/22 telescopic
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 25/04 breaking the electric circuit

Abstract

A protecting device of a desk lamp comprises a seat, two clamping pieces, two parallel telescopic rods, an insulating stopper, a covering plate, a filament, a transformer, etc. A guide groove is formed on the seat. Each of the two sides of the guide groove is installed with a respect fixing rod. The lower end of one of the fixing rods is pivotally locked with a first ring. The upper ends of the fixing rods are pivotally connected with two conducted parallel telescopic rods. The upper ends of the two telescopic rods are connected with a lamp head and an insulating stopper is connected with the two telescopic rods. Two sets of trenches are installed on the bottom of the guide groove so that two clamping pieces are engaged thereon from the seat. Each of the clamping pieces is installed with a receiving portion. Each of the receiving portions is installed with a receiving hole. One of the receiving hole is locked into a second ring. Another receiving hole is locked on the lower end of another fixing rod. One side of each receiving hole is installed with a pair of adjacent guide pieces. A filament is installed between the two clamping pieces and a cover plate is connected on the opening of the guide groove. A transformer is installed within the seat. One of the primary sides of the transformer is connected with a fixing piece ring and another primary side is connected with a second ring. When the two telescopic rods are shorted by an intentional action, the filament is burnt out, thus the transformer is prevented to burn.

Claims

1. A protection system for a desk lamp comprising:

(a) a seat having formed therein at least first and second fixing rod portions and a guide groove portion disposed therebetween, said guide groove portion defining a recessed surface having a plurality of trenches formed therein;

(b) at least a pair of conductive telescopic rods respectively coupled in pivotal manner to said fixing rod portions of said seat to extend substantially in parallel therefrom to a lamp head;

(c) a transformer disposed within said seat, said transformer having first and second primary ring terminals, said first primary ring terminal being coupled to said first fixing rod portion;

(d) at least a pair of clamping pieces engaging said trenches of said guide groove portion of said seat, said clamping pieces being coupled respectively to said second fixing rod portion of said seat and said second primary ring terminal of said transformer; and

,

(e) a fuse wire member disposed in said guide groove portion of said seat, said fuse wire member protectively coupling said clamping pieces one to the other.

2. The protection system as recited in claim 1 wherein each of said clamping pieces includes a receiving portion extending from a guide portion, said receiving portion having a receiving hole formed therein, said guide portion having a pair of guide pieces projecting therefrom.

3. The protection system as recited in claim 2 wherein said guide pieces of one said clamping piece guide portion pass respectively through a first adjacent pair of said guide groove portion trenches and said guide pieces of another said clamping piece guide portion pass respectively through a second adjacent pair of said guide groove portion trenches.

4. The protection system as recited in claim 1 wherein each said fixing rod portion of said seat has formed therein a terminal end having an internally threaded bore.

5. The protection system as recited in claim 1 further comprising an insulating stopper coupled to said telescopic rods to extend between intermediate portions thereof.

6. The protection system as recited in claim 1 wherein said clamping pieces engage said trenches of said guide groove portion from below said recessed surface of said guide groove portion.

7. The protection system as recited in claim 1 wherein said clamping pieces engage aid trenches of said guide groove portion from above said recessed surface of said guide groove portion.