US693162A - Hot-air syringe. - Google Patents

Description

no. 693,162. j Patented Feb. |902. i

A. w. scHnAMM ma. B.-w|| |=onn.

HOT AIR SYRINGE.

(Application led May 15, 190,1.)

no maar.)

1m: onlus PUERS co.. Pucouno., WASHINGTON, u. c,

'Nrran Stars .are-r einen.

ADOLPl-I W. SCHRAMM AND EDVARD B. WILEORD, OF PHILADELPHIA, PENN- SYLVANIA, ASSIGNORS TO ELECTRO n DENTAL MANUFACTURING COM- PANY, OF PHILADELPHIA, PENNSYLVANIA, A`CORPORATION OF NEW JERSEY. y Y

HOT-AIR SYRINGE.

SPECIFICATION forming part of Letters iPatentNo. 693,162, dated February 11, 1902. Application filed May 15,1901: Serial No. 60,388. (No model.)

To @ZZ whom it may concern.-

Be it known that we, ADOLPH W. SCHRAMM and EDWARD B. VVILFORD, citizens ot' the United States, and residents of Philadelphia,

Pennsylvania, have invented certain Improvements in Hot-Air Syringes, of which the following is a specification.

Our invention relates to that class of hotair syringes in which the airin its flow tothe xo nozzle of the syringe passes over an electrically-heated coil, one object of our invention-- being to so construct an instrument of this class as to simplify the operation of the same, a further object being to prevent injuryto i5 the coil by overheating, and a still further object being to so convey the electric current 1. Fig. 3 is a similar view showing one ofV 3o the parts in a different position from that represented in Fig. 2. Fig. 4 is a transverse section ou the line b b, Fig. 1. Figs. 5, 6, 7, and 8 are detached views of parts of the syringe, and Fig;v 9 is a longitudinal section illustrating a modification of the invention.

1 represents the handle of the syringe, which is made of hard rubber or other insulating material and has screwed into or otherwise attached to its llower end a projecting y 4o metallic plug 2, to which is secured, by means of a sleeve or ferrule 3, the upper end of the flexible tube 4, through which the supply of air is conveyed to the syringe. The handle 1 is hollow and has screwed into or otherwise secured to the upper end of it a tubular sleeve 5, into which in turn Ais screwed the lower threaded stem 6 of a plug 7, which is further secured to the sleeve 5 by means of a nut 0 on the lower end of the threaded stem 6.

5o The plug 7 has formed in it two disconnected passages 10 and 11, the adjoining ends of which extend'outwardly and terminate oner above the other at one side ot' the plug. The upper threaded stem 12 ot' the plug receives lthe lower threaded end of a hollow block 13 55A of vinsulating inateriahto which is secured the shield14, which protects the transparent casing 15, in which the heating-coil 1G is located. The shield let carries at its outer end the delivery-nozzle 17 of the syringe, andthe casing 15 has at its outer end an opening 19 in line with the bore ot' said nozzle. The inner end of the casing 15 bears upon the block 13, and the two form a easing for a chamber in which the air is heated by contact with the coil 1G. Theplug 7 is tapered, being larger in diameter 'atthe top than at the bottom, and surrounding said plug is a sleeve 20, correspondingly tapered internally and maintained in 7o snug contact with the plug by means of a spring-washer 21, interposed between the lower end of the sleeve 2O and the upper end of the sleeve 5. The sleeve 2O has in one side a recess or rchamber 22, andthe sleeve isv free to turn to alimited extent on the plug 7, so that said chamber 22 may be caused to open communication' between the passages 10 aud 11 of the plug or maybe turned away from the ends of said passages, so as to cut oit the 8o iiow therethrough. The'sleeve 2O has at the upper end a projecting'pin 23, which enters a segmental recess formed in a washer 24, rest` ing upon the top of the plug 7 and prevented from turning by means of a pin'25, which pro- 85 jects from the top of said plug and enters an l opening 26 in thejwash'er. The washer 24 is in contact with another washer 27 at the lower en d of the insulating-block 13,and said washer 27 is connected to oneterminal 29 of the heating-coil 16, the other terminal 30 of said coil being connected to a block 31, which is secured to a ring 32, the latter surrounding the lower portion of the insulating-block 13 and being slit or severed throughout a portion of 95 its circumference, so as to form a projecting spring-finger 33. 'A similar ring St, with projecting spring-finger 35, surrounds the upper end of the hollow insulating-handle 1 ot the syringe and is connected to a wire 36, einloo 'connection between the same.

bedded in the handle 1 and having its lower end confined between said handle and a nut 37on the plug 2, to which one of the electrical conducting-wiresis soldered orotherwise electrically connected,the other of said Wires ben ing soldered or otherwise electrically connected to the nut 9, which is applied to the lower end of the threaded stem 6 of the plug 7L The current thus passes from one of the conductors to the plug 2, nut 37, wire 36, ring 34, and spring-nger 35, and from the other conductor to the nut 9, stem 6, plug 7, washers 24 and 27, thence to and through the heating-coil to the block 3l, ring 32, and springflnger 33, said spring- ngers 33 and 35 thus constituting terminals of an electric circuit. Hence when these terminals are connected the current will iiow through vthe coil 16, properly heating the same, and when the connection between said terminals is broken the flow of current through the heating-coil will cease. The making and breaking of the circuit is effected by means of a ring 40, composed of insulating material and secured to the sleeve 20, so as to move therewith, said ring having at one side a bar 4l, which when the ring is at onelimit of its movement contacts with and provides connection between the spring terminal lingers 33 and 35, as shown in Figs. 1 and 2, but when said ring 40 is at the other limit of its movement is moved away from said terminal fingers, as shown in Fig. 3, and therefore breaks the The sleeve 2O and ring 40 move as a unit and practically form one part. Hence they may be regarded as a single sleeve and are so regarded in some of the claims. The chamber 22 in the sleeve 20 is Wider than the passages l0 and l1 in the plug 7 and is so disposed in respect to said passages and to the bar 41 of the ring 40 that it will open communication between the passages before said bar 41 makes contact with the spring- terminals 33 and 35 and will not cut oit communication between the passages 10 and 11 until after the bar 41 has been moved out of contact with said spring-fingers. Consequently the iiow of air through the heating-chamber of the syringe is established before the current is turned onto the heating-00H16 and continues until after the current has been cut olf from said coil, thereby preventing any overheating of the coil which might result it' thecurrent was turned onto the same before the {iow of air around the coil began. Furthermore, the control both of the air-liow and of the current is eected by the manipulation of but a single moving element of the instrument-namely, the ring 40-and all of the electric conducting elements of theinst-rument are thoroughly protected by insulating material, so that no accidental short-circuiting of the current can take place and no injury to the person handling the syringe can therefore result.

It is not necessary to the proper carrying out of our invention'that the circuit-controlling switch should constitute a ring mounted so as to be partially rotatable around the airplug, as a longitudinally-sliding ring-such, for instance, as represented at 40L in Fig. 9- will attain the same result, the circuit being broken and the iiow of air cut ott when said sleeve is in its lowermost position, as shown in Fig. 9, but the flow ot air being lirst established and the circuit then closed by alifting movement of said sleeve.

The insulated conductors 42 and 43, i Yhereby the current is conveyed to the syringe, pass through the iieXible air-supply tube 4 and are electrically connected,respectively,to hollow metallic plugs 44 and 45, projecting from the opposite ends of a hollow block 46 ol insulating material, the plug 44 being connected to the outer endof the flexible tube 4 and the plug being intended to be connected to the tube whereby air is supplied to the instrument and each of said plugs being provided with a binding-post 47 for the attachment of the electrical conducting-wires. By this means all strain upon the electrical conductors 42 and 43 is prevented and liability of breaking the connections between said conductors and the otherpartsvof the instrument is overcome.

When it is desired to c ontrol the air-pressure at the nozzle, the forward limit of movement of the sleeve 2O may be such that the chamber 22 will be carried forwardlybeyond the passages 1O and 1l of the plug 7, so that the low of air through said passages may be gradually restricted, the bar 41 remaining in contact with the spring- fingers 33 and 35 during such regulating movement, so as to insure the continued heating of the coil 16.

. Having thus described our invention,we claim and desire to secure by Letters Patentl. The combination in a hot-air syringe, of a hollow handle, a casing inclosing the airheating chamber and containing an electric heating-coil, a plug interposed between the handle and said air-heating chamber, and having disconnected passages therein, and a sleeve movable on said plug and having a chamber for opening communication between the passages of the plug.

2. The combination in a hot-air syringe, of a hollow handle, a casing inclosing the airheating chamber and containing an electric heating-coil, a plug interposed between the handle and said air-heating chamber, and having disconnected passages therein, and a rotatable sleeve surrounding said plug and having a chamber for openingcom 1n unication between the passages of the plug.

3. The combination in la hot-air syringe, of the hollow handle, a casing containing an airheating chamber with electric 'heating-coil therein, a plug interposed between the handle and said air-heating chamber and having disconnected passages therein, electric conductor-terminals, of a circuit including the heating-coil and a sleeve movably mounted on the plug and having a chamber for con- IOO IIO

necting the passages thereof and a'bar for.

connectingsaid electric terminals.

4. The combination in avhotair syringe, of

the hollow handle, a casing containingan air-` heating chamber with electric.heating-coil therein, a plug interposed between said handle and air-heating chamber and having disconnected passages therein, electric conductor-terminals, of a circuit including the heatro ing-coil and a sleeve rotatable on the plug and a hollow handle, a casing containing an airheating chamber and havingan electric heating-coil therein, a plug interposed between the air-heating chamber and the handle and forming .part of an air-controlling valve and zo also part of one of the electric conductors for the heating-coil.

6. The combination in a hot-air syringe, of a hollow handle, a casing containing an airheating chamber and having an'electric heatz5 ing-coil therein, a plug interposed between said air-chamber casing and the handle and constituting part of the air-valve, and also part of one of the electrical conductors for the heating-coil, and a sleeve movably mount- 3o ed onsaid plug and constituting theother part of the air-valve and also a circuit making and breaking switch.

7. -The combination in a hot-air syringe, ot' a hollow handle, a casing containing an air- 3 5 heating chamber and having an electric heating-coil therein, a spring-finger mou nted upon said air-chamber casing'and constituting one of the terminals of an electric circuit containy ing the heating-coil, a similar spring-finger 4o mounted upon the handle and constituting the other terminal of said circuit, and an insulating-sleeve movably mounted between the airchamber casing and the handle and having a bar which by the movement of Ythe sleeve is carried into and out of contact with said spring-terminals.

8. The combination in a hot-air syringe, of Ya hollow handle, a casing containing an airheating chamber and having an electric heat- 5o ing-coil therein, a spring-finger mounted on the air-chamber casing and constituting one of the terminals of the circuit containing the heating-coil, a similar spring-nger mounted upon the handle and constituting the other terminal of said circuit, a plug interposed between the air-chamber casing and the handle and having disconnected air-passages therein, and a sleeve movably mounted on sal-idv plug and vhaving av chamber for connecting 6o the air-passages of the same and a bar for making and breaking connectionv between said spring-terminala 9. The combination in a hot-air syringe, of a hollowhandle, of insulating material, a

casing containing an air-heating chamber and having an electric heating-coil therein, a

sleeve of insulating material forming part of said casing, a springcontact finger mounted on said insulating-sleeve and constituting one ofthe terminalsot' the circuit containing the heating-coil, a spring-contact finger mounted upon the insulating-handle and constituting the other terminal of. said circuit, and an insulating-sleeve movably mounted between the insulating-handle and the insulating-sleeve of the air-chamber casing and lhaving a bar constituting a circuit making and breaking switch, said movable insulating-sleeve inclosing the spring-terminals so as to prevent access thereto from the voutside of the instrument;

l0. The combination in a hot-air syringe, of

a hollow handle of insulating material, a casing inclosing an air-heating chamber and having an electric heating-coil therein, an insulating-sleeve forming part of said -air-chamber casing a contact device mounted on said insulating-sleeve and forming one of the terminals ot the circuit containing the heatingcoil, a contact device mounted on the insulating-handle and forming the other terminal of said circuit, a plug interposed between the insulating-handle and the insulating-sleeve of the air-chamber casin g and having disconnected air-passages therein, and an insulating-sleeve surrounding said plug and constituting a means for controlling the iiow ofair through the syringe, and also surrounding, and provided with means for making and breaking connection between, the terminals on the insulating-handle and on the insulating-sleeve of the air-chamber casing.

ll. The combination in a hot-air syringe, of a hollow handle, a iexible air-conveying pipe attachedthereto, a hollow insulating-block having projecting hollow plugs with bindingposts thereon, and flexible electrical conductors passing through the flexible air-pipe, and electrically connected, one to one of said plugs and the other to the other of the same.

12. 'The combination of a hot-air syringe having an air-passage with electric heatingcoil therein, circuit-terminals for said heating-coil, and a movable element constituting an air- Valve and a circuit making and breakmovably mounted upon said plug and havi ing a channel for connecting the passages of the latter, anda bar for connecting the circuit-terminals, the distance between the channel and passages being less than that between the bar and the circuit-terminals, whereby IIO IZO

ige

the channel and passages being less than that x5 between the bar and the circuit -tern1inals, whereby communication between the air-passages will be established before the bar makes contact with the circuit-terminals.

In testimony whereof we have signed our 2o names to this specification in the presence of two subscribing witnesses.

ADOLPH WV. SCHRAMM. EDVARD B. 7WILFORD.

Witnesses:

F. E. BEoHToLn, Jos. H. KLEIN.

Images