US 2357105 A
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Description (OCR text may contain errors)
Aug; 19444 H. D. GRINNELL 2,357,105
' PULL TYPE LAMP REPLACER f Filed June 19 1943 3 Sheets-Sheet 1 INVENTOR v Hmwwfl Glyn/44 A1TOR YS ,HIb. GRINNELL mp1. TYPE LAMP REPLACER s Shets-Sheet 2 Filed June 19, 1943 INVENTOR 1551mm fl. G P
' A118. 9,1944. H. D. GRINNELL 2,357,105
PULL TYPE LAMP REPLACER Filed June 19, 1943 3 Sheets-Sheet 3 v INVENTOR 1501104120 f/PW/VILL BY a v y A1-ro EYS Patented Aug. 29, 1944 UNITED STATES PATENT OFFlCE PULL TYPE LAMP REPLACER Harold D. Grinnell, Pittsfield, Mass., assignor to The G; O. A. Manufacturing 00., Pittsfield, Mass, a corporation of Massachusetts Application June 19; 1943, Serial No. 491,427
4 Claims. (01. 29420) This invention relates to lamp replacers of the pull socket type, and has particular reference to improvements in such replacers by which the aluminum castings previously used may be replaced by sheetmetal stampings. A further object is to improve the positiveness of the grip with which the lamp socket is held. A further object is to improve the construction of the pivotal support for the arms, to the end that both the initial assembly and the disassembly of the lamp replacer for repair may be facilitated. The replacers are for the same purpose as that shown in the Printiss Patent 1,121,759, December 22, 1914, but have improvements as referred to above and as will be particularly described below.
Referring to the drawings,
Fig. l is a side elevation of the improved lamp replacer;
Fig. 2 is a similar view taken at right angles to Fig. 1;
Fig. 3 is a view similar to Fig. 2, but showing the jaws in open position;
Fig. 4 is a sectional view showing the connection of the jaws to the handle;
Fig. 5 is a section on line 5-5 of Fig. 1;
Fig. 6 is a plan view of the cap member of the pivot support before bending;
Fig. 7 is a similar view thereof after bending;
Figs. 8 and 9 are similar views of the pivot journal member;
Fig. 10 is a side elevation of the assembly of the pivot support with the handle, the parts being shown separated; and
Fig. 11 is a side elevation and Fig. 12 is an inside view of one of the jaws.
As is usual, the lamp replacer is mounted on a base l2 adapted to be received in a holder (not shown) mounted on the end of a jointed handle and held therein by a pin I3. A plurality of jaws, indicated generically by M, are pivotally held upon the upper end of the base, and have abut- ,ments H) which engage a wedge cone I6 slidable vertically on it. The cone rests upon a spring I! compressible between the cone and an enlargement |.8 of the base, and has bosses l9 which may be connected by links 20 to a yoke 2| straddling the base and connected to it by a pivot pin 23. If the yoke is swung downwardly by a pull on a cord 24 the cone will be drawn down to permit the jaws to rock outwardly as shown in Fig. 3.
The construction of the pivot support is best shown in Figs. 4 to 10. It is made from two members, a journal member 25 and a cap member 26. The journal member is stamped out in threearmed formas in Fig. 8, each arm being provided with a central aperture 21: and with tapering ends 28 each having a circular recess 29 and lateral circular recesses 30 of smaller size. The central part of the journal member has a central hole 3| and three smaller dowel holes 32. When the arms are bent over a pivot-sized mandrel as shown in Fig. 9 the recesses 29 form collectively a hole aligned with hole 3|. and the recesses 30 form pairs of dowel holes in alignmentwtih dowel holes 32; It is apparent that the holes 3| and '32 could be formed after the journal member was folded into form, but as they come at the edge of the folded-over arms the procedure described is in general preferable.
The cap piece 26 is formed from a stamping 35 as shown in Fig. 6. It has a central hole 36 and three dowel holes 31. Three double arms 38 are separated by notches 39 which are to receive the jaws, and are divided by notches 40 which define lugs 4|. When the lugs are folded over on the fold lines 42 the resulting cap member is formed as shown in Fig. '7.
The method of assembly of the pivot member is shown in Figs. 4 and 10. The base l2, which is preferably provided with a wooden core 45, has one or more dowel pins 4'6 located in its upper surface to receive the aligned dowel holes 32 and 31 of the journal and cap members. A screw 41 passes through the central holes 3| and 36 and holds the pivot member to the base, rotation of the member being prevented by the dowels. With the jaws M in place pivot pins 48 are passed through the journal 49 formed by bending over the arms of the journal member and through holes 50 in the jaws. The cap member is then set in place, the'lugs 4| will overlie the ends of the pivots and hold them in place. When the screw 41 is removed the cap member can be taken oiT and the pivots removed. This permits much easier disassembly than was possible with former constructions, and is of importance particularly when replacers are returned to the factory for servicing.
For convenience in manufacture the jaws M are each made from two blanks. One of these 5| is bent into curved form of U-shaped cross-section, the legs of the U embracing two wooden blocks 52 and 53 which act as spacers and give rigidity. The pivots 48 are passed through holes in block 52. The second blank 54 is also folded into U- form to embrace block 53 between the parallel sides of blank 5|. Its upper end is folded over and secured to its body portion by rivets or welding 55. At the bend it is cut out at 5B and reentrantly folded at 51 so as to grasp and hold the rim 58 of a pull-type lamp socket 59 as is clearly shown in Figs. 1 and 2. The jaws are con nected to each other by springs 60 located below the pivots, so that the jaws are always held with their abutments If: in contact with the cone IS. The several pieces making up a jaw are held together as by rivets 6|.
What I claim is:
1. A lamp replacer of the swinging jaw type comprising a base, a journal member having a plurality of pivot bearings, lamp grasping jaws, pivot pins received in the pivot bearings and passing into the jaws, a cap member having lugs extending past the ends of the pivot pins to block their removal, and means for securing the journal member and cap member to the base.
2. A lamp replacer of the swinging jaw type comprising a base, a journal member having a plurality of pivot bearings, lamp grasping jaws, pivot pins received in the pivot bearings and passing into the jaws, a cap member having lugs extending past the ends of the pivot pins to block their removal, and means for securing the journal member and cap member to the base comprising a central screw and a plurality of circumferentially spaced dowels.
3. A lamp replacer of the swinging jaw type comprising a base, a sheet metal journal member formed with a central hole, one or more dowel holes, and lateral apertured arms refolded upon the body of the member to form bifurcated pivot bearings with an intermediate jaw-receiving gap,
pivot pins received in said bearings to support the jaws, a sheet metal cap member having a central hole and one or more dowel holes in alignment with those in the journal member and having lugs extending past the ends of the pivot pins to block their removal, and means for securing the journal member and cap member to the base comprising a central screw and one or more dowel pins.
4. A lamp replacer of the swinging jaw type comprising a base, a plurality of sheet metal jaws pivoted to the base in an inwardly facing circumferential series; each having a channel shaped section and having its end portion folded upon itself and recessed to form a lamp socket rim grasping member, a sheet metal journal member formed with a central hole, dowel holes, and lateral apertured arms refolded upon the body of the member to form bifurcated pivot bearings with an intermediate jaw-receiving gap, pivot pins received in said bearings and se cured to said jaws, a sheet metal cap member having a central hole and dowel holes in alignment with those in the journal member, and hav-' ing lugs extending past the ends of the pivot pins l to block their removal, means for securing the journal member and cap member to the base comprising a central screw and a plurality of c rcumferentially spaced dowels, and means for causing simultaneous approach or recession of the jaws to or from the lamp socket.
HAROLD D. GRINNELL.