US269105A - Extension lamp-fixture - Google Patents

Description

To all whom it may concern NITED STATES DEXTER W. PARKER, OF

MERIDEN, CONNECTICUT.

EXTENSION LAM P-FIXTURE.

SPECIFICATION forming part of Letters Patent No. 269,105, dated December 12, 1882.

Application filed November 8, 1882. (No model.)

Be it known that I, DEXTER W. PARKER, a

citizen of the United States, residing at Meriden, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Extension Lamp-Fixtures; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to. which it appertains to make and use the sa'me, reference being had to the accompanying drawings, and to letters or figures of refercnce'marked thereon, which form a partj of this specification. This invention relates to clamping devices for securing the tubes of an extension lampiixture in any position ordegree of extension desired; and it consists principally in a shoe 1 or clamping-piece arranged to bear against the inner tube or rod, in combination with a s1iding wedge, which operates between a tubularattachmentof the outer tube and said shoe to crowd'the latteragainst said inner tube, for the purpose stated.

the wedge to make such clamping action auto- Italso consists in the combinatiomwith the foregoing devices, ot'a spring operating against matic, and ot' a rod, cord, or chain and handle, to release said clamp. 4

In consists, finally, in the peculiar construction and combination of the parts, as hereinafter set forth.

In the accompanying drawings, Figurel represents a vertical section taken through the center of an extension lamp-fixture provided with my improvement. Fig. 2 represents a detail view of the shoe and the inner tube. Fig. 3 represents a detail view of the wedge, its spring, and a part of the rod attached thereto. Fig.4representsa detail perspective view of the incline case against which said wedge works in binding on said shoe.

The same letters indicate the same parts in the several figures.

A designates the bracket or hanger whereby the fixture is attached to the ceiling of an apartment or hall; 13, the inner tube of said fixture, said inner tube being screwed into said hanger or attached thereto in any other convenient manner; 0, a pulley journaled in said hanger, around which the'suspending cord D passes, said cord beingcontinued down through I said tube to the lamp-support or harp E; and F, the outer tube, which is screwed or otherwise conveniently attaehed to said lamp-support and slides over said inner tube telescopically, in the usual manner.

nothing new, and their construction, combination, and arrangement may be considerably In the parts as thus far described there is varied without in the least affecting myinvention.

0n the upper end of outer tube, F, acase, G,

tube, B, and is arranged within the incline case G aforesaid.

I designates a sliding wedge which is forced upward by a spring, J, between shoe H and the inclined face or part 9 of case G. A rod,

.K, extends down from said wedge within the tube F, and is provided below the same with is screwed, which is hollow, and provided on a handle, L, whereby said wedge can be withdrawn at will from between said parts H and g. The shoe H is movable; but the top ofcasc Gr prevents it from being forced upward out of said case, and a shoulder, t, on the inner face of wedge I extends under said shoe to preventitifrom dropping down out of place. The bottom of case G has an opening, g, to allow the downward motion of said wedge when drawn by rod K. The lower bearing-of spring J is against a lug, M,which is attached to or formed on the inner tube, B, and is therefore stationary. As shown in the drawings, the inner face of the wedge and the outer face of the shoe are correspondinglyinclined. This construction makes the clamping action more reliable; but it is not strictly necessary, as the devices will work very well when the contiguous faces are vertical. Of course a solid rod may be used instead of the inner tube, and a cord or chain may be. substituted for the rod K, attached to the wedge. Said rod may operate by pushing instead of pulling, the wedge being reversed and the spring being arranged aboveit. In that case the incline gis of course inverted also.

The operation isobvious, SpringJnormally holds the outer tube clamped to theinnerone by reason of its action against the wedge I. which it forces between incline g and shoe H, thus preventing further descentof the lamp. 1 When the clamp is loosened, by pulling (or'when the parts are inverted by pushing) rod K the weight of the lamp and its attachments will draw down the outer tube in the usual manner. When said rod is released the clamping operation is automatically resumed.

All of the clamping devices described are exterior to the inner tube, B, and as the case G is easily detachable from the outer tube they may readily be inspected, removed, and cleaned or mended. They are exceedingly I simple and cheap in construction. They may be put together by inexpensive workmen oflittle special training, and noconsiderable amount of machine-work is required.

By using a suitable catch for rod K the spring J might be dispensed with; but then the clamping action would not be automatic.

The case G constitutes in efiect a detachable extension of outer tube, F. Theinclined plane 9 within said case or extension is not absolutely indispensable, provided the'outer faceot" the shoe H and the inner face of wedge I be properly inclined to insure clamping action.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In combination with the inner tube or rod and the outer tube of an extension lamp-fixture, an automatic clamping device arranged outside of said inner tube but within a case or extension of said outer tube, substantially as set forth.

2. In combination with the inner tube or rod and the outer tube of an extension lamp-fixture, a clamping device arranged outside of said inner tube and within a detachable case or extension of said outer tube,'substantially as set forth.

3. In combination with the inner tube or rod and the outer tube of an extension lam p-fixture, a shoe which bears against said inner tube, a wedge operating against the back of said shoe, an external case or extension of the 5. In combination with the inner tube or rod and the outer tube of an extension lamp fixture, a shoe bearingagainst said inner tube, a wedge operating against said shoe, an inclined plane which is in 'contact with the outer face of said wedge, a spring which forces said wedge between said inclined plane and said shoe, and a rod whereby said wedge is withdrawn to release the outer tube from the inner one, substantially as set forth.

6. Wedge I, provided with shoulder i, in combination with shoe H. spring J, incline case G. and the outer and inner tubes of an extension lamp-fixture, said shoe being held in position by said shoulder and the top of said case, substantially as set forth.

7. A wedge, I, inclined on both faces, in combination with a shoe, H, inclined on its outer face, a case, G, having an inclined inner face, and a spring which forces said wedge between said inclined faces, said shoe being arranged to bear against the inner tube or rod of an extension lamp-fixture, and said case being attached to the outer tube thereof, substantially as set forth.

8. The telescoped outer and inner tubes of an extension'lamp-fixture, in combination with a case detachably secured on the top of said outer tube, and a wedge-spring and clampingshoe loose within said case and operating, as set forth, said clamping devices being easily accessible and removable when said case is taken off from said outer tube, as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

Witnesses:

RALPH A. PALMER, JOSEPH H. BECKETT.

DEXTER W. PARKER.

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