US 1505654 A
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Description (OCR text may contain errors)
NMACBETH READING LAMP Aug. 19, 1924. 1,505,554
Filed Jan. 5. 1923 111V en tol,
Akt olf-Heya Nerman Mache HL? mames Aug. i9, i924.
NITED STATES PATENT olFlcE."
NORMAN MACBETH, OF PEIHAM, NEW YBK.
READING LAMP. v
Applica/tion led Tanuary 5, 1823. Serial No.` 610,852.
-from either directly downward or at an angle with the vertical. It is also adjustable in height so that the height of the source of light may be ychanged ifde'sired. lThe embodiment of both of these features, however, is not essential, for either may be provided without the other. A furtherobject is to providey for the verticalv adjustment without danger of jarring or-causing 'af blow in a too rapid lowering which vlwould ,cause breakage or injury to the glass or other delicate parts of the lamp. These objects may be obtained with any source of artificial illumination for the lamp ,but the preferred embodiment is with an incandescent electric lamp, and with such a source of-illumina-v tion a further object is toprovide for the support of the lamp bulb so that it is not moved in adjustingthe angular direction of its rays so that the electrical connections may be of a permanent character and not exed that found in daylight.
. in making such adjustments.v Other objectsL are to provide an enclosure ffor the f' lamp Vin which there is a single opening through which the rays of light can pass in only one general direction, and for holding a colored glass in front of this opening'to modify the balance of the wave lengths in the rays to Other objects are to provide a simple'l and substantial and durable Aco`stru :tion of ornamental form, which is easy to clean and keep clean.
In the accompanying sheet of drawings which forms a part of this speciication,
Figure 1 is an 'elevation of one embodiment of this invention in ,which the base, telescoping column and cap or the supportin head are in section; v f
ig. 2 is a section through the head and reector on the line II-II of Fig. 1;
Fig.'3 is a' plan view of the head; andy A Fig. 4 is a detail vof the clamp for the tele` scoping column.
A base 5 supports. a hollow Vtelescoping eolumn which is 1n two parts, one of which is a tube 6 screwed into the base, and the other is a smaller tube slidable in the larger tube v and constituting the telescoping element 7. At the lower end of the telescoping element are two collars 8, 8 between which is a pack` ing/9, of felt washers, which forms a lower guide. At the upper end of the column carried by the base is a bushing 10, above which a felt washerll forms an -upper guide. This washer is clamped in place by a collar 12 screwed to the top of the column. Within the collar is a split ring 13 which can be closed to clamp the telescoping' member through a clamping screw 14.
A piston rod 15, suitably attached to the lower end of the tube 6, is threaded at its lower end and slips through the vbase whereV itis held by a lock nut 16. A tube is con-` veniently used for this pistonrod.v A head 17 is screwed to the upper end of the piston rod and carries a cup washer 18. The piston head is inside the telescoping element and forms therewith afdash-pot. Esca e of air from this is through a small .ori ce 19 in the upperY closed end of the telescoping element. A felt washer 20 underlies the closed end and strikes the head of the piston as a final stop when the parts are telescoped together.
A supporting head comprisingan arm 25 with a ring 26 1s screwed to the upper end of the telescoping element. This arm is tilted upwardly and carries the ring with its plane inclined at an angle of about thirty degrees with the horizontal and its axis is thereforeA at the same angle with the vertical. Surmounting the end of the arm which is screwed to the telescoping element is an electric switch 27. A frame 28, which is attached t'o the ring, supports a porcelain lamp socket29. A iexible cord 30 carries electric wires" 31, 31-which lead to the switch and along grooves in the underside of the arm and rin and up to the lamp socket.
A re ector 35 of parabolic contour has a neck 36 which leads from the side of the reilector so that its axis II-II makes an angle of about thirty degrees with the general ably Jas that of the axis of the ring with the vertical. The reflector is white enameled inside so that the light will be somewhat dill'used in reflection and an accurate parabolicx formv is not essential.- The reflector is provided with `a grooved mouth 36 to which a curved glass 37 colored for modifying the light to daylight balance of its spectrum may be held by a wire ring 39 which rests in the groove. The convex side of the reflector lits closely against the under' side of the` supporting ring and the neck passes therethrough. Owing to the unsymmetrical form of the reflector with respect to the axis of the neck, this axis may be tilted slightly with respect to the axis of the ring when the reflector is brought snugly against the ring, and to hold the reflector properly in place, a ring 40 is fastened to the upper edge of the neck by set screws 41, 41 which engage a groove in the neck. A bearing ring 42 which rests on the supporting ring is connected with the other ring attached to the neck by one of three spacing screws 43, 43, 43, threaded through the ring 40 and' provided with lock nuts, so that the two rings may be spaced apart and out of parallel to such an extent as may be necessary to hold the reflector to the supporting ring without undue loosenessand permit it to be turned freely therein. An incandescent lamp 45 is carried by the socket. Its neck passes through the neck of the reflector and its incandescent filament comes at about the focus of the relector, but as above stated this is not an essential of the invention. It is important to have the source of light relatively close to the mouth of the'reiiector for Adirect pro- ]ection of the light in a wide angle. A cap 46 encloses the upperparts. A screw 47 serves to clamp one of the rings connected' with the reflector and prevent accidental displacement of the reilector'with respect to the supporting ring with consequent change ot the angle at which the rays of light are directed.
By rotating the reflector in the supporting ring the general direction in which the rays are directed can be adjusted between diby Letters Patent of the United States is:
1. The combination with a supporting ring, of a source of light carried thereby, a reflector with an opening for the passage vof light which incloses the source of light,
a neck for the reflector, a bearing ring, meansl for adjusting the bearing ring with respect to the reflector whereby the supporting ring is engaged between the bearing rmg and the reflector, the'bearing ring and relector being free to turn with respect to the supporting ring about an axis which is ,inclined to the axis of the reflector.
2. The combination with a lamp, of a telescoping column for supporting the lamp,
means `for `clamping the telescoping parts4 together, and a piston cooperating with one of the telescoping parts to form a dash-pot. v 3. The combination with a base, of a hollow column carried thereby, a telescoping element within the column, a lamp supported by the telescoping element, and a piston cooperating with the telescoping element to form a dash-pot.
4. Thecombination with a base of a hollow column carried thereby, a telescoping element within the column, a lamp supported by the telescoping element, a piston supported from the base and cooperating with the telescoping element to form a dashpot, and a stop between the head of the piston andthe telescoping element.
Signed at New York, N. Y., this 3rd day of January, 1923.