MXPA98002348A - Chain holder of traction for mounting on boxes of salt - Google Patents

Abstract

The present invention relates to a traction chain socket for a support box, which is assembled in the factory and does not require the coupling of parts of different material in the field. A body member has a depression in its back face to accept a switch assembly. A hole in the neck of the body member receives a threaded screw sleeve. The fasteners extend disengaged screw sleeve to the switch assembly to assemble those parts and to fasten an annular ring in the hole between them, so that the switch assembly and the screw sleeve are held in the assembly together, and towards the member of cuer

Description

CHAIN HOLDER OF TRACTION CHAIN FOR MOUNTING ON BOXES OF EXIT BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The invention relates to lamp holders, and more particularly to lampholders operated with a traction chain to be mounted on exit boxes mounted on a ceiling, walls, etc.

Description of the Prior Art Lampholders operated with a typical traction chain of the known prior art include a body member with a central cavity and a central hole extending through the body of the member. An interrupter and a threaded screw sleeve are joined together and inserted through the body member on the back of the surface, so that the switch rests on the central cavity and the threaded screw sleeve extends through the body. of the central hole with a portion extending beyond a neck of reduced diameter. An internally threaded cap is screwed onto the opposite end portion of the threaded screw sleeve to anchor the switch and the screw sleeve in place, and to insulate the exposed end portion of the screw sleeve. Since the threaded screw sleeve is made of metal and the cap is made of an insulating material, such as porcelain, the external thread of the threaded screw sleeve and the internal threads of the cap do not closely match, making the assembly in the field is difficult. Also, if the joining surfaces of the cap and neck of the body member, which defines the hole, are not flat and regular, the cap can not be properly seated on the threaded screw sleeve, making the assembly insecure.

COMPENDIUM OF THE INVENTION The lamp holder of the present invention overcomes the difficulties noted above with respect to devices of the prior art. A body member is formed with a depression or cavity in its rear surface to accept a switch assembly and a neck extending from its anterior surface with a central hole therethrough, in which a threaded screw sleeve is placed. An annular ring is placed in the central hole adjacent to its intersection with the depression. The switch assembly is placed in the depression and against an annular ring surface. A threaded screw sleeve is introduced via the central hole to engage the opposite surface of the annular ring. Fasteners attach the threaded screw sleeve to the switch assembly catching the annular ring between them. Since the switch assembly is larger than the central hole, it can not be removed through the central hole. Tabs extending outward from the threaded screw sleeve engage depressions in the face of the annular ring to prevent the threaded screw sleeve from being removed from the body member via the posterior depression. It is an object of this invention to provide a novel lampholder, which can be mounted on an outlet box. It is an object of the present invention to provide a novel lampholder, whose component assemblies are assembled at the factory. It is a further object of the present invention to provide a novel lampholder, whose component assemblies do not have to be assembled in the field. Other objects and aspects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which describe, by way of example, the principles of the invention, and the best mode that is currently contemplated for carrying it out. .

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, in which similar elements are given similar reference characters: Figure 1 is an exploded side elevational view of a lamp holder to be installed on an outlet box according to the prior art. Fig. 2 is a rear plan view of the device of Fig. 1. Figure 3 is a bottom right perspective view, front of a lampholder constructed in accordance with the concepts of the invention. Figure 4 is a top right perspective view, from above of the lampholder of Figure 3. Figure 5 is a top plan view of the body member of the lampholder of Figure 3. Figure 6 is a top plan view of the Body member, as shown in Figure 5 with the switch assembly added. Figure 7 is a bottom plan view of the body member of the lampholder of Figure 3. Figure 8 is a side elevational view, partially in section, of the body member of Figure 3, taken along the length of the line 8-8 of Figure 6. Figure 9 is a side elevational view of the screw screw drive of the device of Figure 3. Figure 1 0 is a front elevational view of the threaded screw sleeve of FIG. Figure 9, with the contact deviated by res, installed. Figure 1 1 is a front elevational view of the threaded screw sleeve of Figure 9, with the stop tabs deployed. Figure 12 is a fragmentary side elevational view, partially in section, of the body member, showing the outlet opening of the pull chain and a portion of the breaker assembly. Figure 13 is a top plan view of the switch assembly. Figure 14 is a side elevational view, fragmentary, partially in section, of the assembly of the conductor end bands with the switch assembly. Figure 15 is a bottom plan view of the device of Figure 3. Figure 16 is a schematic view showing the cable placement of the lampholder hereof to an alternating current (AC) power source.

DESCRIPTION OF THE PREFERRED MODALITY Turning now to Figures 1 and 2, a lampholder 20 according to the prior art is shown. A body member 22 of an insulating material, such as porcelain, has a depression or cavity 24, which communicates with a central hole 26. A pull chain switch assembly 28 is positioned in the depression 24 with the sheath threaded screw 30 extending through the hole 26 and beyond the end 34 of the neck 32. A cover 36, having a central hole and the threaded central bore walls, is screwed onto the external threads 31 of the threaded screw sleeve 30. to hold the assembly body member switch 28 and the screw sleeve 30 in the assembly. In an appropriately matching unit, the upper surface 38 of the lid 36 will engage the end 34 of the neck 32 and there will be no gaps, with the screw sheath 30, exposed, and the switch assembly 28 will be fully seated in the depression 24. The conductors electrical in the outlet box will be connected to the switch assembly 28 through contact bands 40, 42, each of which contains a terminal screw 44, 46, respectively. In the usual case, the lid 36 is removed and the body member 22 is separated from the switch assembly 28 and the threaded screw sleeve 30. The separation of the body member 22 from the switch assembly 28 and from the screw sleeve 30, gives to the installer a much lighter element to support. Next, the electrical conductors are attached, one to the terminal screw 44 and the other to the terminal screw 46. The threaded screw sleeve 30 with the assembled switch assembly 28 is now inserted with a portion extending beyond the end 34 of the neck 32, and the cap 36 is screwed onto the exposed portion of the screw sleeve 30, which extends beyond the end 34 of the neck 32. The complete lamp holder 20 can now be mounted to an outlet box (not shown) making passing suitable fasteners (not shown) through slots 48 and towards the threaded openings in the ears of the outlet box (not shown). Since the industry uses an exit box of different sizes, it is necessary to have lampholders that fit each of the different sizes of outlet boxes. The installer must hold the assembled lampholder 20 in place, while installing the fasteners through the slots 48 and into the threaded openings in the ears of the outlet box. Returning now to Figures 3 to 15, a lampholder 60 constructed in accordance with the concepts of the invention is shown. A body 62 formed of an insulating material such as porcelain, plastic, rubber or the like, is formed with a moderate continuous neck 64, having a central hole 66 therethrough. A depression or cavity 68 is formed in the ear of the body 62 and communicates with a central hole 66. An annular ring 70 is positioned adjacent the junction of the depression 68 and the hole 66. Slots 72 may be used (only one of which is seen in Figure 4) on the rear face of the annular ring 70, for positioning the switch assembly and preventing rotation thereof during the installation or removal of a lamp in the threaded screw sleeve, as will be described later. Depressed pads 74, 76, each contain keyhole slots 78, 84, respectively, on different centers. The keyhole slots 78 are arranged to accept mounting screws (not shown) of 8.255 cm exit boxes, for example, and keyhole slots 84 are arranged to accept mounting screws (not shown) of 10.16 cm exit boxes. . The mounting screws are placed in the threaded openings in the ears of the outlet box (not shown) with the screw heads below the surface of the outlet box. The screws are allowed to enter the appropriate series of keyhole slots by inserting large end openings 80, 86. The body 62 is then bent, so that the screws enter the elongated slots 82, 88, respectively. Then the screws can be tightened to complete the assembly of the bulb holder 60 to the outlet box. A depression 90 (see Figure 5) in the depression 68 further contains an opening 92, through which the drive or rosary chain 94 of the switch assembly 150 passes. Around the central hole 66, two support pads 96, 98 are provided for the ends of the end members 100 and 102. The support pad 96 has two straight walls 104, which prevent the end member 100 from rotating, and the pad of support 98 similarly has two straight walls 106 to prevent the terminal member 102 from rotating as a lamp threadably engages or decouples the threaded screw sleeve 67. A collar 108 is constructed on the body surface of the lamp holder 62 around the opening 92 with a round entry 1 10 to allow the rosary chain 94 to move easily within the opening 92 (see Figures 3 and 12). Threaded screw sleeve 67 (see Figures 9, 10 and 11) is made of a conductive metal tube 12 with threads 1 14 formed from a first end 16 to approximately half of the tube 12 for coupling Threaded with the screw screw base of a lamp (not shown). Adjacent to the second end 118 of the tube 112, a portion of the perimeter of the tube 112 is removed to form two tabs 120, adjacent each end of a tube diameter D extending perpendicular to the central longitudinal axis 122 of the threaded screw sleeve 67. two tabs 120 copper each side of the tube 112 are displaced outward, generally parallel with the diameter D. The dimension D52 is greater than the dimension D51, which is the distance between the longitudinal axis 122 and the outer periphery of the tube 112 adjacent to the end 118. As shown in Figure 7, the front face of annular ring 70 has two depressions 124 on opposite sides of a diameter, each of which receives two tongues 120 extended on one end of the diameter to prevent the sheath Screw screw 67 is pulled through the central hole 66 and out of the depression 68. As will be described later, the tabs 120 are used for s Attach the switch assembly 150 and the threaded screw sleeve 67 together with the annular ring 70 therebetween. Returning to Figures 9 to 11, the ends 126 of the tube 112 at the end 116 are bent inwardly perpendicular to the shaft 122. The ends 126, in turn, are fixed to the switch assembly cover 150 and the skirt 154, through rivets or chinks 128 or screws 132 passing through. of the openings 130. The cover of the switch assembly 150 and the skirt 154 are made of phenolic materials or other insulating materials. A flat spring contact 134 is anchored to the switch assembly 150 through a rivet or gap 136, and is insulated from the ends 126 through the switch assembly 150. A pin 142 that passes through the opening 140 is connected to a spring contact 134 for connecting one of the lines of the AC power source (alternating current) to the base contact of a lamp by threadably coupling the threaded screw sleeve 67. An additional screw 138, which passes through the opening 137, coupling one end 126, so that the screw screw base of one inserted lamp is electrically connected to the threaded screw sleeve 67 and the other line of the AC power source. The assembly 150 will now be described with reference to Figures 4, 5, 6, 13 and 14. The switch assembly 150 includes a sealed portion 152 containing a rotary switch operated between on and off positions through a drive chain or rosary chain 94. The portion 152 has a skirt portion 154 around the central portion 156 of the portion 152, as best seen in Figure 6. An opening (not visible) allows the bolt 138 to engage a contact plate of metal 158 and insert a threaded opening in the end of end member 102 (see Figure 14). The end 106 of the terminal member 102 rests on the support pad 98 between the straight walls 106, which prevent rotation of the end member 102 and the switch assembly 150. A terminal screw 162 threadably engaging the threaded opening 164, allows the The bare end of a conductor, connected to one of the lines of the AC power source, is attached to the terminal member 102, which is thereby connected through the bolt 138 to the threaded screw sleeve 67. The pin 142 is extends through the opening 140 and an opening (not visible) in the skirt 154 to engage a metal contact plate similar to the plate 158 but not visible and threadably couples the opening in the end portion of the end member 100. The end 166 of the end member 100 rests on the support pad 96 between the straight walls 104, which prevents rotation of the end member 100 and the switch assembly 150. The terminal screw 168 r It ostensely couples the threaded opening 170 and can be adjusted over the bare end of the second conductor connected to the other line of the AC power source. To assemble the lamp holder 60, a switch assembly 150 is placed in the depression or cavity 68, so that the neck 151 is within the depression 90, and the pull or rosary chain 94 extends through the opening 92 and through the collar 108. The tabs 153 (see Figure 8) are positioned in the depressions 72 in the rear face of the annular ring 70. This places the switch assembly 150 and prevents its rotation when a lamp threadably engages or disengages the threaded screw sleeve 67. It also prevents downward movement of the switch assembly 150 through the central hole 66. The end member 100 is placed with the end 166 on the support pad 96 and its other end on the contact plate 158, while the end member 102 is placed with the end 160 on the support pad 98 and its other end on a contact plate similar to the contact plate 158. The screw sleeve 67 is inserted with the end 118, first into the central hole 66 and advanced until the tabs 120, flexed outwards, they are placed in the depressions 124 on the front face of the annular ring 70. Now, a bolt 142 is passed through the opening 140 through an opening in the skirt 154, a threaded opening in the contact plate and a threaded opening in the end portion of the end member 100. A bolt 138 is similarly passed through an opening in the skirt 154, a threaded opening in the contact plate 158 and a threaded opening in the end portion of the end member 102. A bolt 102 that passes through the opening 130 to the switch assembly 150 provides additional assembly support. The switch assembly 150 and the threaded screw sleeve 67 are now attached to each other and fastened to the rear and front faces, respectively, of the annular ring 70 (see Figure 15). Figure 16 schematically shows how the traction chain lampholder 60 can be wired to an AC 190 power source. The power source AC 190 is connected through a cable 188 directly to the contact spring 134, which connects the power source. base contact 184 of the lamp 180, whose threaded screw sleeve 182 threatensly engages the threaded screw sleeve 67. When the pull chain 94 is pulled to close the switch, the wire 186 is completed to the threaded screw sleeve 67 and the lamp 180 lights up. Since the fundamental novel aspects of the invention have been shown and described and applied as they apply to the preferred embodiment contemplated, it will be understood that several omissions and substitutions and changes in the form and details of the devices illustrated and in their operation can be do for those skilled in the art, without departing from the spirit of the invention.

Claims (10)

1. CLAIMS 1 .- A traction chain socket for an outlet box comprises: a) a body member having a rear face and an anterior face with a neck extending from the anterior face along a longitudinal axis perpendicular to the plane of said body member; b) a depression in said posterior face; c) a central hole in the neck extending from the free end of said neck towards the depression in the posterior face; d) an annular ring around said neck wall, defining the central hole extending towards the central air gap at the junction of said central hole and the depression; e) switch assembly means in the depression positioned adjacent a rear face of the annular ring; f) threaded screw sleeve means placed in the neck hole and adjacent to an anterior face of said annular ring; and g) fastening means engaging said switch assembly means and said threaded screw sleeve means to hold the switch assembly means and threaded screw sleeve means in the assembly between each other and the annular ring.
2. 2. - A lamp holder according to claim 1, wherein the body member has an opening from the rear face towards the front face to allow a pull chain of said switch assembly means to extend through the body member and a collar on the anterior face adjacent said opening, said collar having an additional opening communicating with the opening and the end of said additional opening adjacent the free end of the round collar to allow said traction chain to move freely within the opening and said additional opening.
3. 3. A lampholder according to claim 1, wherein the rear face of said annular ring has first depressions therein and said means of switch assemblies have first tongues, which enter the first associated depressions when said assembly means switch are appropriately placed in the depression of the body member.
4. 4. A lampholder according to claim 1, wherein the front face of the annular ring has first depressions therein, and said threaded screw sleeve means have first tabs, which enter the first associated depressions when the means of threaded screw sheath are appropriately placed in the central hole of the neck.
5. 5. A lampholder according to claim 1, wherein: a) said rear face of the annular ring has first depressions therein; b) said switch assembly means have first tabs entering the first associated depressions when said switch assembly means are appropriately placed in said depression of the body member; c) said front face of the annular ring has second depressions therein; and d) said threaded screw sleeve means have second tabs which enter into associated depressions when said screw sleeve means are appropriately placed in the central hole of the collar.
6. 6. A lamp holder according to claim 4, wherein the first tabs are flexibly portions of said threaded screw sleeve means.
7. 7. A lampholder according to claim 5, wherein the second tabs are flexibly portions of the threaded screw sleeve means.
8. 8. A lampholder according to claim 1, further comprising: a) mounting holes that extend through said hole member from a rear face toward a front face, said mounting guides or bisected to a fixed distance from the longitudinal axis; b) said mounting holes allowing passage of the fastening means therethrough to secure the body member to an outlet box.
9. 9. A lamp holder according to claim 8, further comprising: a) additional mounting holes extending through the body member from a rear face to a front face, said additional mounting holes located at a distance from the longitudinal axis different from the fixed distance; b) said additional mounting holes allowing passage of the fastening means therethrough to secure the body member to an outlet box; c) said mounting holes and said additional mounting holes allowing the body member to be mounted to outlet boxes of different dimensions.
10. 10. A lampholder according to claim 8, wherein said mounting holes are keyhole slots, which allow said lampholder to be mounted to an outlet box by twisting the lampholder after it has been placed on said outlet box. . 1 - A lampholder according to claim 9, wherein said mounting holes and said additional mounting holes are each keyhole slots, which allow said lampholder to be mounted to an outlet box by twisting the lampholder after that has been placed on the exit box. 12. A method for assembling a lampholder, comprising the steps of: a) placing an insulated body having a rear face with a depression therein and a neck perpendicular to the front face of said insulator body, a central hole in said neck communicating with said depression and having an annular ring in the hole adjacent to its junction with said depression, so that said depression and said hole are accessible; b) inserting switch means in said depression and against the rear face of said annular ring; c) insert screw-threaded means into the threaded hole and against the front face of the annular ring; and d) inserting the fasteners through openings in said threaded screw sleeve stockings into the threaded openings in said inter-screw assembling means for securing said switch-over means to the threaded screw sleeve means and securing said ring annular between them, whereby said isolated body, said means of assembling the switch and said threaded screw drive means are assembled.