US2352496A - Collapsible and vertically adjustable stand for work lamps - Google Patents

Description

June 27, 1944.

J. c. RosE COLLAPSIBLE AND VERTICALLY ADJUSTABLE STAND FOR WORK LAMPS 2 Sheets-Sheet 1 Filed Feb. 16, 1942 fliazlar ksrs' 6305a filler/2611a.

J. C. ROSE June 27, 1944.

COLLAPSIIBLE ANIj VERTICALLY ADJUSTABLE STAND FOR WORK LAMPS 2 Sheets-Sheet 2 'Filed Feb. 10, 1942 m In I v Mania) Jess (fiase.

Fig. 1;

Patented June 27, 1944 UNITED STATES PATENT OFFICE,"

COLLAPSIBLE AND VERTICALLY ADJUST- ABLE STAND FOR WORK LAMPS Jess G. Rose, Los Alngeles, Califi, assignor to Bardwell & McAlister, Inc., Los Angeles, Calif., a corporation of California Application February 10, 1942, Serial No. 430,224

2 Claims.

This invention relates generally to vertically adjustable stands for lamps, and more particularly to vertically adjustable stands for work lamps such as may be utilized in factories for the illumination of the work on which an individual workman may be engaged.

An object of the invention is the provision of an adjustable stand for work lamps, adapted to support a plurality of work lamps in vertically adjustable positions from which light may be projected onto the Work from both sides as well as from over the head of the workman.

A further object is the provision of a vertically adjustable lamp stand of the character mentioned which is of simple and inexpensive construction and which also is adapted to be collapsed for convenience in packing and shipping.

Other objects, features and accomplishments of the invention, not mentioned in the foregoing, willappear and be described in the course of the following detailed description of I one present preferred illustrative embodiment thereof, reference for this purpose being had to the accompanying drawings, in which:

Fig. 1 is an elevation'of a lamp stand in accordance with the invention, the stand being shown in unfolded condition in full lines, and indicating the collapsed position of the arms and legs of the stand in dotted lines;

Fig. 2 is an enlarged view, in vertical medial section, of a portion of Fig. 1;

Fig. 2a is a detail section taken on line Eat- 20 of Fig. 2;

Fig. 3 is a detail section taken on line 33 of Fig. 1;

Fig. 4 is a detail section taken'on line 4-4 of 1;

Fig. 5 is a detail section takenon line 55 of Fig. 6 is a detail section taken on line 6-5 of Fig. i; and

Fig. '7 is an enlarged View similar to a portion of Fig. l, but showing certain parts in section.

In the drawings numeral H3 designates generally the stationary outside supporting tube of the stand, said stand being pinned or otherwise secured at its lower end within a socket I I to which .arepivotally connected three supporting legs I2, the latter being furnished with casters l3.

The legs 12 are preferably and here shown as tubular in form, and their upper or inner end portions anddownwami t a small angle from socket ll (Fig. 7), the members l6 being braced by webs ll. In unfolded or operative position, theend portions of the legs !2, inwardly of the pivot mountings, engage these semi-cylindric wall members l6, in the manner clearly illustrated in Fig. '7. In collapsed position, the legs 12 are folded upwardly, as to the position indicated in dotted lines in Fig. 1, the pivot mountings of the legs being sufiiciently advanced beyond the ends of the Wall members It to permit such action. The legs I2 being in the outwardly extended position of Figs. 1 and '7, they are braced in such position by means of a frog I8 engaging their underside and supporting them firmly against the Wall member it, a central manually operable screw l9 threaded into the lower end of socket. H being set up to support the parts firmly in the described position. As here shown, the frog I8 is provided with'p-airs of spaced legs adapted for engagement with the undersides of the several legs [2. It will of course be understood that the screw l9 and frog is are removed to permit collapsing of the legs l2 to the upper folded position indicated in dotted lines in Fig. 1.

Fastened on the upper end of tube IE! is a fitting 24 having a lower tubular portion 25 formed with a bore 25 receiving the upper end portion of tube I0 and formedwith an upper reduced tubular portion 2'! formed with a bore 23 which slida-bly receives a second tube 29 which is adapted for telescopic reception within tube l0. The juncture of bores 26 and 28 afiords a downwardly facing annular shoulder 30 which seats on the upper end of tube ill, and the lower tubular portion 25 of the fitting islongitudinally split at 3i, and provided with a clamping screw at 32, by which the screw 36 threaded through a boss 31 formed on the outer wall of box 34, and furnished with a handle 38 by which it may be conveniently manipulated. It will be understood that the screw 36 is loosened to relieve the pressure of the shoe againstthe tube 29 when it is desired to effect vertical adjustment of the latter, and, is again set up to secure saidtube against vertical displacement when the adjustment has been accomplished.

Though the described second tube 29 might directly carry the upper lamp, and such an arrangement comes within the broad scope of the invention, I here show a preferred arrangement in which a third supporting tube 4-0 is employed, being telescopically receivable within the first and second tubes, and being extensible to desired heights from the latter. Accordingly, there is fastened on the upper end of second tube 29, a

fitting 24a, which is in all respects similar to the previously described fitting 24 mounted on the upper end of the first tube Ill, and hence need not be described in detail. Suffice it to say that the third tube is slidably fitted within the fitting 24a, and is adapted to be clamped in vertically adjusted position by a shoe 35a set up by means of a manually operable screw 35a.

The upper end of the upper, inner, telescoping tube 40, in this instance the third tube, carries a Work lamp 44, which may be of any desired type. In the present instance, this lamp 44 is typically illustrated as a fluorescent tube lamp, of conventional design, trunnioned on a horizontal axis between the arms of a yoke 45. The yoke J45! may be: demountably supported on the upper end of the tube 4!] in any suitable manner, though that detailed in Fig. 3 is simple and preferred. As there shown, a socket 46 welded to and extending downwardly from the yoke slips on over a pin 41 mounted in and extending upwardly from the upper end of tube 40, the lower end of the socket 46 engaging and being supported by a collar 48 mounted on the upper end of tube 40. A taper pin 48a is here shown as securing the pin 41, collar 48 and tube 40 in assembly. A manually operable screw 49 threaded through a boss 50 formed on the side of socket 45 is engageable in an annular groove 5| formed near the upper end of pin 41 to secure the socket 46 against rotation, as well as against accidental separation from the pin 41 and supporting tube 40.

A mounting for two oppositely exten ing side lamp supporting arms 56 surrounds and is vertically slidable for adjustment purposes on the lower, outside tube In of the stand. This mounting 55 comprises forward and rearward castings providing semi-cylindric. wall portions 58 and 59, respectively, which together define a sleeve surrounding and slidably embracing the tubular member ID, the two castings being provided with abutting flanges 68 and 6! on oppesite sides of such sleeve, secured together as by rivets 52. Extending from flanges 50 and 59 are cars 63 and 64, respectively, suitably braced by webs 65 and 6B, and spaced apartfor reception 5 of the slightly flattened inner end portions 55a of the two normally horizontal tubular arms 55.

Pivot pins 51 serve to pivotally connect the arms 56 to the ears 63 and 64, in the manner clearly illustrated in Fig. 5. A box 61 formed on casting 58 encloses an arcuately faced shoe 68 which engages tube IO, being set up to clamp the mountin 55 in vertically adjusted position by means of manually operable screw 69 threaded through the outer wall of said box, all as will be clear from Fig. 5.

Embracing and pinned to arms 56, at points suitably spaced from the pivotal connections of said arms with the vertically slidable mounting 55, are sleeves 10, from which bracing arms ll extend downwardly and inwardly to engage the lower tube ll! of the stand at a point spaced somewhat below the mounting member 55; Asshown in Fig. 6, the lower ends of said arms H are formed with arcuate seats 12 adapted to en.-

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for shipment or storag purposes.

gage and be supported by opposite sides of tube I0. These seats 12 slide easily on the tube [0 during vertical adjustment of the mounting 55 and side lamps carried thereby.

The outer ends of the arms 56 demountably carry the two side lamps 14, here illustratively shown as of the same conventional fluorescent tube type as the previously described upper fluorescent lamp 44. The two side lamps T4 are spaced apart in a lateral direction by a distance sufficient to give room for a workman to stand therebetween without interfering with the light thrown forwardly from said lamps. Each of the lamps 14 is shown as trunnioned between the two arms of a yoke 15, the later being provided at the bottom with a socket 16 adapted to he slipped over a pin 11 mounted on and extending upwardly from the outer end of the corresponding arm 55 (see Fig. 4). As there shown, the pin 'l'l may be secured to the arm 56 by means of a screw 18, while a manually operable screw 19 threaded through a boss formed on the side of socket 16 is engageable with an annular groove 8% formed around the upper end of pin 11 to secure the socket l6 and lamp carried thereby against rotation and against accidental separation from mounting pin 11.

The lamp stand as now described has many advantages. As previously stated, the two side lamps 74 are spaced apart laterally a suflicient distance to permit a workman to stand therebetween, while the upper lamp 44 is vertically adjustable to an elevation above the head of the workman. The two side lamps are vertically adjustable by moving the mounting member 55 up and down on the lower, outside tube ll! of the stand. The side lamps 14 and overhead lamps 44 are individually adjustable about their respective horizontal trunnion axes in all vertical positions. These described adjustments permit extraordinary flexibility of adjustment and adaptability to various lighting problems encountered in practice. The stand has the further advantage that it is very readily collapsible into a small sized unit The lamps themselves are very readily demounted, simply by loosening the clamp screws 49 and I9 and lifting the lamp-carrying yokes from the supporting pins. Thereafter, the two upper tubes 29 and 40 may be telescoped into lower tube It], side-lamp carryin arms 56 may be collapsed into the position indicated in dotted lines in Fig. 1, and finally, after removal of the bracing frog. [8, the legs I2 may be collapsed into the position also indicated in dotted lines in Fig. 1. As so telescoped and collapsed, the stand is reduced to small size and compact arrangement, convenient for shipment purposes, as well as requiring but little space for storage. In addition to the advantages already pointed out, the stand as described is relatively simple and inexpensive in construction, though of rugged and well braced design, and is at the same time exceptionallyconvenient to manipulate or adjust, as well as to assemble and disassemble.

It will be understood that th drawings and description are for illustrative purposes only, and

that various changes in design, structure and arthe first mentioned tube and adapted to support a lamp, means for clamping the second mentioned tube in selected positions of vertical adjustment, a mounting vertically slidable on the outside of the first tube, means for clamping said mounting to said first tube in selected positions of vertical adjustment, oppositely projecting lamp supporting arms pivotally connected to said mounting, and bracing means connected to said arms at points spaced outwardly from the pivotal connections of the arms and extending downwardly to engage opposite sides of said first mentioned tube at a point below said pivotal connections, said bracing means when in engagement with said first tube supporting said arms in outwardly extended positions, and said arms being collapsible in an upward direction by pivotal action at said pivotal connections.

2. In a lamp stand, the combination of a vertical tube, a second vertical tube telescopically receivable within the first tube, a third vertical tube telescopically receivable within the second tube, means on the first and second tubes for clamping the second and third tubes, respectively, in positions of vertical adjustment, a mounting vertically slidable on the outside of the first tube, means for clamping said mounting to said first tube in selected positions of vertical adjustment, oppositely projecting lamp supporting arms pivotally connected to, said mounting, and bracing means connected to said arms at points spaced outwardly from the pivotal connections of the arms and extending downwardly to engage opposite sides of said first mentioned tube at a point below said pivotal connections, said bracing means when in engagement with said first tube supporting said arms in outwardly extended positions, and said arms being collapsible in an upward direction by pivotal action at said pivotal connec-' tions.

JESS C. ROSE.

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