Title of Invention

"AN IMPROVED SCREWLESS PUSHBAR LAMPHOLDER"

Abstract

The present invention relates to an improved screwless pushbar lampholder comprising an outer shell having a shade ring, an upper dome and barrel joined to each other by means of a union ring, an insert comprising a body, a cover removably attached to each other, means for switching the lamp, placed between the said body and said cover of the said insert, wherein a pair of spring actuated plungers housed in the said hollow cover of the said insert, a pair of protrusions placed parallelly adjacent to the said pair of springs inside the inner portion of the said cover of said insert, three U-shaped protrusions provided on the outer portion of the body of said insert for the insertion of terminal wires, wherein a pair of resilient terminals with an open edge angle are provided to grip the said main terminal wires provided through the said U-shape protrusion, a pair of cavities provided in the inner side of the body of the said insert conforming to the size and shape of said resilient terminal to house the said terminals, means for gripping the earth wire and said dome of the shell by way of a screwless earth terminal housed in the said insert body, a cord grip provided on the outer portion of the body of the said insert to grip the said terminal wires and means for demounting the said terminal wires provided at the back of said U-shape protrusions for the smooth removal of said terminal wires.

Full Text

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to screwless pushbar lampholder. More particularly this invention relates to the lampholder which has in built screwless terminals. The embodiment of the invention resides in the inbuilt screwless main terminal & earth terminal & earth terminal in the same insert. The principal object of this invention is to provide a lampholder which has in built screwless main terminals as well as earth terminal in the same insert so as to ease the fixation of respective wire into the terminals. 2. Description of the Related Art In general, the screwless pushbar lampholder having live and neutral terminals are known conventionally. The lampholder having earthing connection on the body of the shell is conventional especially in case of metallic bodies which are fixed with the help of screws. 3. SUMMARY OF THE INVENTION To solve the above-described problems, it is an objective of the present invention to provide Safety and convenience while handling lampholder. An improved screwless pushbar lampholder wherein a unique screwless terminal is designed with integrated screwless earth terminal housed in the body of the insert, suitable for bom stranded and solid conductor. Electrical contacts from screwless terminals (Live and Neutral) were aimed through a pair of springs, a pair of plunger pipes and a pair of small collar pipes. The spring rests on the screwless terminals specially designed to provide electrical contact through brass/allied material, whereas the holding/gripping of the conductor in the screwless terminals were through resilient materials like spring steel and the like. The screwless terminals are housed in pockets of the insert with suitable retention device for retaining the screwless terminals in position. To overcome the drawbacks in the existing pushbar lampholders, in the Subject screwless pushbar lampholder, the screwless terminals are housed in specially configured pockets of the body of lampholder insert. The screwless terminals (Live and Neutral) are retained by two projected legs from the cover as well as by the projection of the longslide, that makes and breaks of the switching operation. In the subject invention the electrical contacts from the Live & Neutral screwless terminals are made through two small pipes which are housed in the specially made pocket on the long slide, through two long coiled springs which are positioned on the small pipes and remain pressed by two plunger pipes retained in the cover. In the "OFF" position a pair of collar pipes, spring and the plunger pipe-assembly are positioned on the insulation part of the insert body and in the "ON" position, the long slide/switch moves over the body of Insert, carrying alongwith it the two small pipes on to the screwless terminals, top faces constantly keeping contacts with the pair of plunger pipes through the pair of compressed coil springs. The body of the insert has special means for retaining/preventing the conductor becoming work loose by means of U-type elongations at the back of the body of the insert. The conductors are released from the screwless terminals with putting little pressure by means of small pointed pin. The body of insert is also provided with cord grips for the Live & Neutral conductor wires. A special Screwless earth Terminal is in-built in the insert, thereby making it convenient for wiring of Line, Neutral and earth terminal in the same insert, saving much labour in wiring operation. The required creepage and the clearance, within the restricted space available in the pushbar insert body is maintained without sacrificing efficiency of the switching operation, which is another embodiment of the subject invention. In the Screwless Earth Terminal there are means for contacting with the Dome of the lampholder through front, rear and top of the dome's U-cut-Surfaces, to ensure adequate conductivity for the earth contact. The said Insert fitted with the Screwless Earth Terminal when assembled with the dome, the earth terminal grippes the front, rear and top of the U-cut surfaces of the dome, making electrical contacts. Finally when the union Ring is tightened in assembling the lamp holder, the screwless earth terminal makes positive electrical contacts with the dome U-cut surrounding surfaces, thus ensuring adequate electrical earth conductivity/continuity as per standard. In this special design of the screwless Earth Terminal, contacts with the dome surface has been ensured through brass/copper bearing material with adequate resilience. At the same time gripping of both solid/ stranded conductors are done through resilient material like spring steel. To ensure proper earth continuity, the back up support to the brass /copper bearing strip is provided with an extension of the spring steel. The embodiment of the invention resides in the design of the Earth Terminal, assembled by riveting, having means for diagonal support to the spring steel clamping strip so as to provide adequate gripping of the conductor with small movement of the conductor insertion into screwless earth terminal. The terminal has provision for self retention into the specially designed pocket of insert body through a projection spring thereby making it possible for removing the earth terminal from the pocket if required. A suitable means for releasing/removing the earth terminal is provided in the body of the insert. There is also a means in the body for releasing the conductor from the earth terminal. The surface of the body of the insert is provided with markings for connecting the Live, Neutral & Earth Terminals. The screwless earth terminal which is push-in type can be easily inserted in the insert body thus providing means for adequate earth contact/continuity with the metal part of the lampholder. The embodiment of the invention resides in the provisions for optional safety Lampholder. Thus, the invention provides screwless Pushbar Lampholder with integrated screwless earth terminals, wherein the insert comprises a pair of springs having one end housed in the pair of plungers guide holes and the other end in the pair of collar pipe through holes of the longslide. The said pair of guide holes are provided on the switch slide to hold the collar pipe. A pair of pillar is provided on the inner portion of the cover of the insert. The said switch slide is marked at both the ends to indicate its position. A pair of terminals with one edge angle and open are placed in the body of the said insert. The wire insertion and de-mounting holes are provided at the outer portion of the body of the insert for fixing wire. Three protrusions are provided on the outer portion of the body in the insert, which get fixed in the three slots positioned on the cover of the said insert. The two main terminals and one earth terminal are housed in the cavities of the body. The de-mounting holes are provided near the insertion/fixation holes located at the outer portion of body of the insert. Thus terminals are built in the body of the insert itself. An improved screwless pushbar Lampholder comprising an outer shell having a shade ring, an upper dome and barrel joined to each other by means of a union ring, an insert comprising a body and a cover removably attached to each other,means for switching the lamp placed between the said body and said cover of the said insert, an optional feature for safety lampholders to switch-off the current when the bulb is removed from the said lamp holder, a pair of spring actuated plungers housed in the said hollow cover of the said insert, a pair of protrusions placed parallellely adjacent to the said pair of springs inside the inner portion of the said cover of said insert, three U-shaped protrusions provided on the outer portion of the aid cover of said insert for the insertion of terminal wires, wherein a pair of resilient terminals with an open edge angle are provided to grip the said main terminal wires provided through the said U-shape protrusion , a pair of cavities provided in the inner side of the body of the said insert conforming to the size and shape of said resilient terminals to house the said terminals, means for gripping the earth wire characterized in that it has a rectangular open edged terminal having a diagonal support placed opposite the said open end, where the diagonal support of the said rectangular terminal is extended to from the outer and top side of the u-shape holding device and the said earth wire contact strip is extended to form the inner side of the said holding device, the additional support to the said holding device is provided by the extended outer strip of the said rectangular open edged terminal with the said dome of the said shell by gripping edges formed by such extended ends gripping the front, rear and top of the U-cut of the said dome of the said outer shell making electrical contact with the surface of the said dome of the said outer shell, a cord grip provided on the outer portion of the body of the said insert to grip the said terminal wires and means for de-mounting the said terminal wires provided at the back of said U-shape protrusions for the smooth removal of said terminal wires. BRIEF DESCRIPTION OF THE DRAWINGS The above objective and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which: Figure 1.: depicts the front elevation of the shell of the screwless pushbar Lampholder switched. Figure 2.: depicts the perspective view of the screwless pushbar Lampholder switched. Figure 3 : depicts the front elevation of the insert of the screwless pushbar Lampholder switched Figure 4.: depicts the sectional view of the screwless pushbar Lampholder switched in the "ON" mode. Figure 5.: depicts the sectional view of the screwless pushbar Lampholder in "OFF" mode Figure 6.: depicts the perspective view of the insert screwless pushbar Lampholder switched. Figure 7.: depicts the parts of the screwless pushbar Lampholder switched. DETAILED DESCRIPTION OF THE INVENTION Now, Screwless Pushbar Lampholder according to a preferred embodiment of the present invention, and according to the method will be described in detail with reference to the attached drawings. The screwless switched pushbar Lampholder consists of mainly two parts. The outer metallic part is called shell and the inner part is referred to as an insert. As shown in figure 1, the shell consists of a tube or barrel (2), having a pair of J-out slots (1) and a collar for supporting union ring (5) uniting the dome (7) and tube or barrel (2). Dome (7) is provided with U-cut slots (6) for the movements of the switch slide. As shown in figure 2, the U-cut slots are provided for the movement of switch slide (9). The dome also contacts with screwless earth terminal (8) and is provided with entry threads (15) as showing figure 5, to fix the Lampholder. The insert as showing figure 5 and 6, consists of plunger set (10), provided with a pair of springs (19), loaded with contact pipe (20). The springs (19) pressures actuates the switch (9). Two screwless terminals (21) are housed in the cavities provided at the body of the insert. Wires are inserted through the U-type protrusions (17) and released through demounting hole (18) as shown in figure 6. The insert is provided with cord grips (23) having a pair of cavities to support the flex. A bulb (26) as shown in figure 4 is the source of light. A screwless earth terminal (8) is fixed in insert housed in the cavity made in the body itself. The means for gripping the earth wire and dome surface comprises a rectangular open edged terminal having a diagonal support placed opposite the said open end. The diagonal support extended to form the outer and top side of the U-shape holding device, the earth wire contact strip extended to form the inner side of the said holding device, the outer strip of the said rectangular open edged terminal extended outwardly to from a U-shape holding device to provide additional support to the said holding device. The outer metallic shell is prepared from the sheet coil which passes through various known operations of pressing and later on to tapping, punching and by threading machines. The body and the cover of the insert is made from glass filled plastic to have elasticity to avoid breakage when fitting the cover onto the body. Manufactured by spring coiling machines, springs are coiled and then tempered to attain the required tension. The one end of each spring is inserted in the plunger pipe and the other end into the collar pipe, which passes through the guide holes of the switch slide. Thereafter, the body is fitted with cover by inserting the legs of body into the slot of cover. The insert is kept inside the tube /barrel such that the slot of insert is on the hollow/dimple of the barrel/tube. The dome is put on the tube and over it union ring is tightened, lastly the shade ring is rotated over the tube. To wire the screwless pushbar lampholder switched, the wires are pushed in the holes of terminals and then the live and Neutral wires are cord-gripped. The wired insert is then assembled in the metallic landholders. The subject invention is a more statement of invention and should not in any way constructed to restrict the scope of the invention. Accordingly, the subject invention relates to an relates to an improved screwless pushbar lampholder comprising an outer shell having a shade ring, an upper dome and barrel joined to each other by means of a union ring, an insert comprising a body and a cover removably attached to each other, means for switching the lamp, placed between the said body and said cover of the said insert, a pair of spring actuated plungers housed in the said hollow cover of the said insert, a pair of protrusions placed parallellely adjacent to the said insert, three U-shaped protrusions provided on the outer portion of the body of said insert for the insertion of terminal wires, wherein a pair of resilient terminals with an open edge angle are provided to grip the said main terminal wire provided through the said U-shape protrusion, a pair of cavities provided in the inner side of the body of the said insert conforming to the size and shape of said resilient terminals to house the said terminals, means for gripping the earth wire and said dome of the shell, a cord grip provided on the outer portion of the body of the said insert to grip the said terminal wires and means for de-mounting the said terminal wires provided at the back of said- shape protrusions for the smooth removal of said terminal wires. The another embodiment of the invention resides in an improved screwless pushbar lampholder comprising an outer shell having a shade ring, an upper dome and barrel joined to each other by means of a union ring, an insert comprising a body and a cover removably attached to each other, means for switching the lamp placed between the said body and said cover of the said insert, an optional feature for safety Lampholders to switch-off the current when the bulb is removed from the said lamp holder, a pair of spring actuated plungers housed in the said hollow cover of the said insert, a pair of protrusions placed parallelely adjacent to the said pair of springs inside the inner portion of the said cover of said insert, three U-shaped protrusions provided on the outer portion of the body of said insert for the insertion of terminal wires, wherein a pair of resilient terminals with an open edge angle are provided to grip the said main terminal wires provided through the said U-shape protrusion, a pair of cavities provided in the inner side of the body of the said insert conforming to the size and shape of said resilient terminals to house the said terminals , a rectangular open edged terminal having a diagonal support placed opposite the said open end, where the outer strip of the said rectangular terminal forming the said open edge is extended to form the outer side of the U-shape holding device and the said diagonal support is extended to form the inner side of the said holding device, the additional support to the said holding device is provided by another extended strip of the said rectangular open edge terminal with the said dome of the said shell by gripping edges formed by such extended ends griping the front, rear and top of the U-cut of the said dome of the said outer shell making electrical contact with the surface of the said dome of the said outer shell, a cord grip provided on the outer portion of the body of the said insert to grip the said terminal wires and means for de-mounting the said terminal wires provided at the back of the said U-shape protrusion for the smooth removal of said terminal wires. While this invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. WE CLAIM: 1. An improved screwless pushbar Lampholder comprising an outer shell having a shade ring, an upper dome and barrel joined to each other by means of a union ring, an insert comprising a body and a cover removably attached to each other, means for switching the lamp placed between the said body and said cover of the said insert, an optional feature for safety lampholders to switch-off the current when the bulb is removed from the said lamp holder, a pair of spring actuated plungers housed in the said hollow cover of the said insert, a pair of protrusions placed parallellely adjacent to the said pair of springs inside the inner portion of the said cover of said insert, three U-shaped protrusions provided on the outer portion of the aid cover of said insert for the insertion of terminal wires, wherein a pair of resilient terminals with an open edge angle are provided to grip the said main terminal wires provided through the said U-shape protrusion , a pair of cavities provided in the inner side of the body of the said insert conforming to the size and shape of said resilient terminals to house the said terminals, means for gripping the earth wire characterized in that it has a rectangular open edged terminal having a diagonal support placed opposite the said open end, where the diagonal support of the said rectangular terminal is extended to from the outer and top side of the u-shape holding device and the said earth wire contact strip is extended to form the inner side of the said holding device, the additional support to the said holding device is provided by the extended outer strip of the said rectangular open edged terminal with the said dome of the said shell by gripping edges formed by such extended ends gripping the front, rear and top of the U-cut of the said dome of the said outer shell making electrical contact with the surface of the said dome of the said outer shell, a cord grip provided on the outer portion of the body of the said insert to grip the said terminal wires and means for demounting the said terminal wires provided at the back of said U-shape protrusions for the smooth removal of said terminal wires. 2. An improved screwless pushbar lampholder as claimed in claiml, wherein the said means for gripping the earth wire and dome surface comprises a rectangular open edged terminal having a diagonal support placed opposite the said open end, the diagonal support of the said rectangular terminal forming the said open edge extended to from the outer and top side of the U-shape holding device, the said earth wire contact strip of the said rectangular open edged terminal extended outwardly to form a U-shape holding device to provide additional support to the said holding device. 3. An improved screwless pushbar Lampholder as claimed in claim 2, wherein the said plurality of extended strips are riveted together to form said U-shaped holding device with additional support grip. 4. An improved screwless pushbar Lampholder as claimed in claim 1, wherein the said diagonal support strip is preferably made up of brass or copper bearing material and the said outer strip extended from the said rectangular open edged terminal is made up preferably of spring steel. 5. An improved Screwless Pushbar Lampholder substantially as described and as illustrated herein with reference to the accompanying drawings."

Documents:

201-del-1999-abstract.pdf

201-del-1999-claims.pdf

201-del-1999-correspondence-others.pdf

201-del-1999-correspondence-po.pdf

201-del-1999-description (complete).pdf

201-del-1999-drawings.pdf

201-del-1999-form-1.pdf

201-del-1999-form-19.pdf

201-del-1999-form-2.pdf

201-del-1999-form-3.pdf

201-del-1999-form-4.pdf

201-del-1999-form-5.pdf

201-del-1999-form-62.pdf