US758444A - Gas-light negative-printing attachment. - Google Patents

Description

c ol-yemzve A HORNE YS 15 INVENTOR G. W. HARSE'. GAS LIGHT NEGATIVE PRINTING ATTACHMENT.

APPLIOATI'ON FILED 0012, 1903. y

W! TNE SSE S NO MODEL.

I A UNITED SFATES Patented April 26, 1904.

PATENT ()FFIQE.

GAS-LIGHT NEGATIVE-PRINTING ATTACHMENT.

SPECIFICATION formingpart of Letters Patent N... 758,444, dated n ril ee, 1904.

Application filer. October 2, 1903.

3 T all whom it 772/007 concern.-

v Be it known thatLGnoRen WILLIAM HARsn, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York,

' have invented a new and Improved Gas-Light candescent mantles.

One object that I have in view is the pro vision of a simple, light, and cheap device which may be easilyfitted to an ordinary gasburner in aposition to expose a negative and tance from the light and to provide an im-- the sensitized paper held in an ordinary printi ing-frame to the rays of light.

' A further object is to provide means for holding the printing-frame at any desired disproved form of holder adapted to receive printing-frames of different sizes and allow the'rapid introduction or removal thereof.

Further objects and advantages of the invention will appear in the course of the subjoined description, and the actual scope thereof will be defined by the annexed claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a perspective view illustrating my device applied to an ordinary gas-burner and supporting a printing-frame of the usual construction. Fig. 2 is a vertical sectional elevation through the parts shown by Fig. 1, omitting the gas-burner, the plane of the section being indicated by the dotted line 2 2 of Fig. 4:. Fig. 3 is a cross-section on the line 3 3 of Fig. 4 looking in the direction of the arrow; and Fig. I is a detail plan view of the holder and its associated parts applied to a portion of the supporting-arm, the printingframe being omitted.

In carrying my invention into practice I employ an arm 5, a holder 6, and means for 5 adjustably clamping said holder upon the arm,

Serial No. 175,480. (No model.)

the latter being constructed for application to an ordinary gas-burner A, the several parts being disposed for cooperation in supporting a'printing-frame B in thedesired position relative to the gas-burner.

In a device intended to be mounted or supported on a gas-burner it is necessary to reduce the weight of the entire device as much as possible and at the same time to make the parts quite strong, so that they. are able to support the printing-frame'in a position to expose the negative and the sensitized paper to the action of the light-rays.

The arm 5 is made of a single piece of sheet metal, which is pressed or struck up in a suitablemachine, so'as' to provide longitudinal flanges or lips 7 atth'e side edges thereof, thereby giving the plate 5 a channeled form in cross-section, as indicated more clearly by Figs. 1 and 3. Any suitable means may be provided near one end portion of the arm 5 for mounting it upon the gas-burner A; but,

as shown by Figs. 1 and 2, this arm is formed 'with an upstanding nipple 8, which is adapted to receive the stationary part on the gaspipe A,"after which the burner A is screwed on said stationary part in a way to engage with the nipple 8, and thus firmly connect the arm 5 to said pipe and burner. The nipple affords an enlarged bearing for the arm on the burner;' but I do not desire to strictly confine myself to this detail of construction. The arm 5 is also provided with a longitudinal slot 9, which may be of any desired length, the free end of said slot terminating a considerable distance away from the nipple, as shown by the drawings.

The holder 6 is arranged transversely of the arm 5 in order to occupy a position at right angles across said arm, substantially as shown by the drawings. This holder consists of a flat bottom plate having an upstanding narrow flange 10 at its front edge and a higher flange 11 at its rear edge, the two flanges being arranged in parallel relation and forming a groove or channel which is adapted to receive the printing-frame B. As shown, I prefer to make the holder 6 wider-than the thickness of the printing-frame, and in order to hold frames of diflerent thicknesses securely Within the holder a fricti0n-spring 12 is pro vided within said holder. As shown by Fig. 2, the spring is bowed or curved, and one end of the spring is secured firmly to an end portion of the holder, as by riveting the spring at 13 to the front flange 10 The other end of the spring is curved reversely at its bowed portion, and it is free or unconfined, thus allowing the spring to be pressed toward the flange 10 when a printing-frame is introduced into the holder. The means which I prefer to employ for slidably or adjustably connecting the holder to the arm consists of a guide boxing 14:, preferably constructed of metal and secured to the under or bottom face of the holder in any approved way, as by riveting or soldering the parts. This guide-boxing is provided with depending flanges 15 and with inwardly-extending flanges 16, said boxing being made or struck up in the form shown by Fig. 3. The depending flanges 15 of the guide-boxing are adapted to slidably embrace the flanges 7 of the channeled arm, whereas the inwardly extending flanges 16 of said guide-boxing fit below said flanges 7, thus making the guide-boxing snugly embrace the channeled arm in a way to prevent any loose movement or play of the boxing on the arm, while at the same time the boxing is capable of a slidable endwise movement on the channeled arm 5. The guide-boxing 14:.extends rearwardly from the flange 11 of the holder 6, and on this extended portion of the boxing is rigidly secured a thickened plate 17, having a threaded opening, said plate constituting a nut, which is shown as being made fast with the boxing, although said nut may be made in one piece with said boxing, if desired. A clamping-screw 18 passes through the slot 9 of the channeled arm and has threaded engagement with the fixed nut 17 of the guide-boxing, said screw 18 having a milled head 19. A washer 2O lies between the head of the clamping-screw and the under face of the slotted part 9 of the channeled arm, and the screw is adapted to be tightened in order to clamp the holder firmly on the bar or arm at any desired point of adjustment.

To apply my'device to a gas-burner, it is only necessary to remove the burner A from the threaded part of the pipe A and slip the nipple 8 of the channeled arm over said part of the pipe, after which the burner is replaced. The flanged boxing 1A is slipped endwise over the slotted part of the arm in a way to bring the flange 10 of the holder opposite to the burner A, and this boxing, with its contained holder 6, may be held at any desired point of adjustment on the arm and at a suitable distance from the burner. The printing-frame is adapted to receive the negative and the sensitized paper in the ordinary way, and this frame can be easily and quickly slipped end wise into the holder 6. The light from the burner A should be diminished during the operation of placing the printing-frame in the holder; but after the parts shall have been properly assembled the light can be increased in intensity, so that the rays of light will pass through the negative and make the desired latent impression on the sensitized paper.

The printing-frame can be easily removed from the holder, and the several parts may be adjusted, assembled, or dismounted, as may be desired.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent- 1. A gas-light printing attachment of the class described, having an arm provided with means for supporting the same on a gas-fixture, a holder arranged transversely of the arm and fitted slidably thereon, and means for clamping the holder at a desired point of adjustment on the arm.

2. A gas-light printing attachment consisting of an arm, a holder arranged transversely across the arm and fitted slidably thereto, a friction spring carried by the holder, and means for clamping the holder adjustably to said arm.

3. A gas-light printing attachment, consisting of an arm having means for application to a burner, a holder slidably mounted on the arm and constructed to receive printingframes of different sizes, means carried by the holder for clamping a printing-frame firmly thereto, and means for securing the holder at a desired point of adjustment on the arm.

4. A gas-light printing attachment, consisting of a channeled arm having means for ap plication to a gas-burner, a guide-boxing e111- bracing the channeled arm, a holder movable with said boxing, and means for clamping the boxing and holder at a desired point of adjustment on the arm.

5. A gas-light printing attachment, consisting of a channeled bar having means for at tachment to a burner and a longitudinal slot, a guide-boxing embracing the channeled bar and slidable thereon, said boxing havinga nut, a holder attached to the boxing and movable therewith on said arm, and a clamping-screw passing through said slotted arm and having threaded engagement with the nut of the guide-boxing.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

GEORGE ILLIAM HARSE.

\Vitnesses: I

' GEORGE J. MGFADDEN,

J. N. DUNN.

Images