US2389340A

US2389340A - Adjustable holder for electric lamps and the like purposes

Info

Publication number: US2389340A
Application number: US541035A
Authority: US
Inventors: Bateman James Robert
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-06-17
Filing date: 1944-06-19
Publication date: 1945-11-20
Anticipated expiration: 1962-11-20

Description

Nov. 20, 1945. J. R. BATEMAN ADJUSTABLE HOLDER FOR ELECTRIC LAMPS AND THE LIKE PURPOSES 2 Sheets-Sheet 1 Filed June 19, 1944 Nov. 20, 1945. J. R. BATEMAN ADJUSTABLE HOLDER FOR ELECTRIC LAMPS- AND THE LIKE PURPOSES Filed June 19, 1944 2 Sheets-Sheet 2 Patented Nov. 20, 1945 ADJUSTABLE HOLDER EOE ELEGTRIC LAMPS .AND .THE LIKE PURPOSES James Robert Bateman, Hatfield, England Application June 19, 1944 fienialiflmidlywi In GreatBri-tain JuneIZ, 19.43

(Chm-$6) late to like ,parts throughout the several times.

'1 Claim.

invention relates to adjustable holders 10rsupports for electric lamps and the like purposes which may be readilyattached to or supported on, or .by,.a desk, wall, ceiling, machine .or other fixture and are so constructed that the lamp may be directed to throw a beam of light in any desired direct-ion.

The invention has particular reference to the type of adjustable holder or support which comprises two or more tubular arms hinged together, one end of the holder being attached to or upon the fixture and the electric conductor passing from this end through the arms to the other end where the connection is made to the lamp.

The main object of the present invention is to provide an improved hinge joint between the tubular arms of adjustable holders of the kind referred to above, the constituent parts of which are so constructed as to considerably facilitate their assemblage. Further objects are to provide guides for the passage of the conductor from one tubular arm to the other adjacent arm to which it is hinged of such a nature as to prevent damage to the wires when the hinge is closed and also to so improve the bearing surfaces of the hinge joint that an efficient grip is obtained while permitting necessary adjustment due to wear and avoiding metallic frictional contact surfaces which are liable to cause the joint to work loose should it become lubricated by any cutting oils, water or other liquid used in the machine or fixture on which the lamp is mounted.

A hinge joint between the tubular arms of adjustable holders for electric lamps, through which the electric conductor is passed, according to this invention comprises apertured lugs provided at the ends of the two arms and overlapping to hinge the arms together by a hinge bolt passing through the apertures in the lugs and through apertures in friction washers of compressible material interposed between the lugs, and through two annular members constituting spacer pieces and acting as guides for the electric conductor in its passage from one tubular arm to the other and engaging with the tubular arm to rotate therewith on a friction washer interposed between the two annular members and furnishing a frictional bearing surface without metallic contact, in addition to those afforded by the overlapping lugs and their interposed friction washers.

But in order that the invention may be clearly understood and readily carried into practice reference is now made to the accompanying drawings in which similar reference characters reand in which- Flame .1 shows an adjustable holder eonstmcted according to the mention,

Figure 21s :a .cross section on the .line .AZB Figure 1 and Figure 3 is a similar view on .the line .C-:D Figure 1.

Figure 4 is a view in elevation and part section of one of the annular spacer pieces and guides for the electric conductor.

Figure 5 is an exploded view of the holder.

Referring to the drawings and particularly to Figure 5 thereof which clearly shows the parts employed to constitute the improved hinge joint, it will be seen that the tubular arms represented by the reference characters a and b, are of square cross section and are each provided with a pair of apertured circular and dished lugs c, d and e, f at one end, the lugs c and ,f being slightly offset from the surfaces of the arms a and b to which they are respectively attached. In bringing the two arms a and b together to form the hinge joint, lug c of arm a overlaps lug e of arm b, and lug j f arm b overlaps lug d of arm a but to avoid frictional contact 01 metallic surfaces friction washers k of compressible material are inserted between lugs c and e and similar washers are inserted between lugs J and d.

To guide the electric conductor n through the joint in its passage from arm a to arm b the two annular members 0 and p are formed with their apertures q of comparatively large diameter and with channel guides r and also on their reverse faces with circular lips s to locate the friction washer t. In the assembled joint the annular members 0 and p are superposed and the channel guides r engage in the ends of the arms in and b but the compressible friction washer t encircles the lips s and is of sufficient thickness to prevent contact of the metallic surfaces.

The hinge bolt is conveniently formed in two arts, g, h, the tubular part h being threaded internally to engage the screw-threaded shank i of the part g.

In assembling the joint the electric conductor n is threaded through arm a along channel guide r and through aperture q of guide member 0, washer t, aperture q and along channel guide r of guide member p to and through arm b. The guide members 0 and p are then superposed with the interposed washer t encircling the lips s and the guides r disposed in opposite directions. then brought together with lug c of arm a over- The lugged ends of the arms a and b are lapping lug e of arm b and lug ,f of arm 17 overlapping lug d of arm a and the guide members 0, p, with the interposed washer t, inserted between the pairs of overlapping lugs and the channel parts 7* engaged in the ends of the arms a and b. The washers k and m are then inserted between lugs c and e and lugs ,f and d and finally the parts 9 and h .of the hinge bolt are threaded through thecentral apertures in the overlapping lugs and interposed washers and through the associated conductor guide members and interposed washer and screwed together to the retact between the bearing surfaces to hold the arms a and b in their relative positions.

The annular members 0 and p not only act as spacer pieces and provide convenient guides for the electric conductor 11, in its passage from the arm a to the arm b but also due to the comformed with apertures and overlapping, friction washers of compressible material interposed between the lugs, annular members constitutin spacers and acting as guides for the electric conductor in its passage from one tubular arm to r the other and engaging with the arms to rotate therewith, a bolt passing through the apertures in the lugs and through apertures formed in the" friction washers and through the spacers, and a friction washer interposed between the annular members and providing a frictional bearing surface without metallic contact and in addition to that afforded by the overlapping lugs and the interposed friction washers.

JAMES ROBERT BATEMAN.