US40241A

US40241A - Improvement in lamps

Info

Publication number: US40241A
Authority: US
Publication date: 1863-10-13
Anticipated expiration: 1880-10-13

Description

. c. w. "CAHOON.

Lanip.

Patented Oct. 13, 1863.

UNITED STATES PATENT Germs.

CHARLES NV. OAHOON, OF PORTLAND, MAINE.

IMPROVEMENT IN LAMPs.

Specification forming part of Letters Patent No. 40,2411, dated October 13, 18.3.

To all whom, it may concern:

Be it known that 1, CHARLES W. OAHOON, of Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvementsin Lamps; and I do hereby declare that the following is a full, clear, and exact description of my said invention, reference being had to the accompanying drawings, in which Figure 1 represents a side elevation of a lamp embodying my improvements. Fig. 2 represents a vertical section of the same through the center of the handle. Fig. 3 represents a top view of the burner, with the clamp-ring in section. Fig. 4 represents an elevation ofa portion of thelamp, looking over the handle; and Fig. 5 represents avertical section of a part of the lamp following the line or w of Fig. 3.

My present invention consists of certain improvements in lamps, which are represented in the accompanying drawings as applied to a lamp with avibratable chimney-holder.

The object of the first part of my invention is to enable the support of the chimney-holder, although constructed separately from the burner and clamped upon it, to be rigidly se-- cured thereto, so that it will not turn thereon,

and consists in combining the two by means of a tooth upon one and areeess in the other, in addition to the clamp-fastening.

The second part of my invention consists in a perforated corrugated airchamber, which is light, ornamental, and rigid, and which takes the place of the non-perforated corrugated air-screen and smooth perforated airchamber previously used in such lamps, a single device thus taking the place of the two devices previously used.

The object of the third part of my invention is to prevent the chimney'holder, when secured to the burner, from be1n g bent laterally in unscrewing the burner from the collar of the lamp and screwing it fast again, and consists in combining the chimney-holder with two tonguesone on each side of the burner-which bear laterally against the burner or some piece secured thereto, and prevent the chimney-holder from being bent out of place by unscrewing and screwing in the burner.

The fourth part of my invention is important in a' lamp in which the support of the chimney-holderis screwed to the burner, and

its objectis to limit the distance to which the lamp and limits the distance to which the burner can be screwed into the collar.

The lamp represented in the accompanying drawings has a collar,A,into which the burner B is screwed, and the burner has the support 0 of the chimney-holder d clamped upon it. The chimney-holder in this example is vibratable upon a pivot, e; and in order to prevent it from moving while thelamp is carried about a curved friction-spring, f, is secured to it. This friction-spring consists of a ring-formed plate of metal, doubled up so that a half-circular plate embraces each side of the support c of the chimney-holder, and, bearing against it by the s1 ring of the metal, furnishes sufficient friction to prevent the 000' free movement of the chimney-holder. The two sides of this spring are pinched closely together at a short distance, i, from the bend, so as to form stops which prevent the chimney from being vibrated so far as to turn its upper end downward. The support of the chimneyholder has a ring-base, m, which is clamped upon the rim of the burner B by a rivet, n, andin order that it may not turn upon the burner when an eflort is made to unscrew the latter from its collar, the two are further secured by a tooth, s, which enters into a recess, it, made in the rim of the burner. This tooth is readily formed in the manner represented in the drawings, by indenting the exterior of the rin g clam p, and thus causing a corresponding protuberance or tooth upon its interior.

The air-chamber H of the lamp is made fast to the'chimney-holder and is corrugated, so that it is very rigid, although of but light weight. It is also perforated, to permit the entrance of air, and thus takes the place of the solid corrugated air-screen and plain perforated air chamber found in previous lamps. As the air-chamber is screwed to the chimneyholder, the application of the hand to the former for the purpose of unscrewing the burner from its collar tends to bend the chimney-holder laterally from its central position over the wick-tube. In order to prevent such lateral bending, two tongues, 0000, at the opposite sides of the lower edge of the air-chamber, are bent inward, so that their points embrace the ring base m of the support ofthe chimneyholder, wh'ch is clamped upon and sustained by the rim of the burner; hence, when an effort is made to unscrew the burner or to screw it into place, one of these tongues, hearing against the base on, prevents the lateral bending and consequent distortion of the chimney-holder. It is not necessary that these tongues should be bent in far enough to touch the burner or the part against which they are to bear, as the elasticity of the chimney-holder will permit a certain amount of lateral movement without permanent distortion, and when the force is removed theparts willreassumetheirpositions. Asthesetongues form part of a series which are made around the lower edge of the air-chamber for ornament, the bending of two of them inward to resist the lateral distortion of the chimney holder, to which the air-chamber is secured, is aver-y simp e and cheap means of producing the required result.

In makinglamps in quantities, itis not easy to secure the collars to thelamps in such manner that the ehimney'holders of all the lamps will occupy the same positions in reference to the handles hence, the support of the chimney-holder will not always project over the handle of the lamp (which is the place it should occupy) when the burner is screwed in to the full extent of its screw. I obviate this defect by the application ofa stop, which prevents the further turning of the burner after the chimney-holder has arrived over the handle of the lamp (or other position whereit is desirable to have it) during the last turn of the screw. This stop, in the present case, is made adjustable, and consists of a screw, z, which is screwed through the burner so that its projecting lower end can bear against the upper surface of the collarA ot the lamp. The mode of adjusting this stop is as follows: When the burner is first applied to the collar of the lamp, it is screwed down to its full extent. It is then screwed back a fraction of a revolution, sufficient to bring the support 0 of the chimney-holder over the handle I. Then the screw stop 2 is screwed down until its lower end bears upon the collar A. The end of the screw thus limits the distance to which the burner can be screwed intothecollar, and stops it always with the chimney-holder thumb-plate g over the handle of the lamp in a convenient position to be moved. Such a stop may be used in lamps without chimneyholders, where, for some other reason, it may be desirable to stop the turning of the burner at a certain point.

The parts of the lamp which have not been described are sufficiently represented in the drawings to show their connection with the parts to which my invention pertains.

Having thus described a lamp embodying my improvements, what I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination of the clampsupport of the chimney-holder with the burner by means of a tooth and recess to prevent the support from turning upon the burner, substantially as set forth.

2. A perforated corrugated air-chamber for a lamp, constructed substantially as set forth.

3. The combination of the chimney-holder with two tongues to bear againstthe opposite sides of the burner or some part secured thereto, and prevent the bending of the chimneyholder laterally by the unscrewing or screwin g in of the burner, substantially as set forth.

4. The combination of the burner, which is connected with the collar of the lamp by a screw-thread, with a stop, which limits the distance to which the burner can be screwed into the collar of the lamp, substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

CHAS. W. CAHOON.

Witnesses:

J. B. OAHooN, M. G. OAHOON.