US958424A - Alarm for glue-heaters. - Google Patents

Description

, C. H. NIEMANN.

ALARM FOR GLUB HEATERS.

APPLIOATIOH FILED 0011, 190e.

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Patented May 1 7, 1 9 10.

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UNITED STATES PATENT OFFICE.

cLEMENs II. NIEMANN, or CINCINNATI, oIIIo.

.ALARM FOR GLUE-HEATERS.

To all whom 'it may concern:

Be it known that I, CLEMENS H. NIE- MANN, a citizen of the United States, residing at Cincinnati, in the county of I-Iamilton and State of Ohio, have invented certain new and useful Improvements in Alarms for Glue-Heaters, of which the following is a specification.

Glue, such as generally used by carpenters, joiners, wood workers and other trades, usually made from animal tissue, will become plastic or soft by the application of heat and sets upon cooling, and is usually cooked before use and applied in a heated state. If, however, too great a degree of heat be applied to the glue, it will deteriorate and its adhesive qualities will be lessened or destroyed. If, on the other hand, too low a degree of heat be applied to the glue, it will not melt properly or be of the correct consistency when applied. The consistency of the glue depends also not only upon the heat of the glue, but also upon the proper amount of water or moisture added to the glue in cooking. If the degree of heat applied in cooking be too low, there is danger that the workman will add too much water in order to bring the mixture to the proper liquid state for ready application, as with a brush, and it is the object of my invention, therefore, to provide means for indicating the heat of the glue, so that the glue may be maintained at the proper heat.

My invention consists in providing an alarm for a glue-heater which will indicate when the limits of heat within which it is desired to maintain the glue are reached, and the invention will be readily understood from the following description and claims, and from the drawing in which latter:

Figure 1 is a side elevation of my improved device, the glue-tank being partly broken away for better illustration of parts. Fig. 2 is a front elevation of my improved device. Fig. 3 is a cross-section of the same taken on the line 3-3 of Fig. 2, with the fingers shown in side elevation in somewhat different relation from that shown in Fig. 2; and, Fig. 1 is a detail in cross-section showing the manner of attaching the gluefaucet.

1 represents a glue-tank comprising an inner shell 2 and an outer shell 3 forming a jacketed tank which has a compartment 4 between the shells for receiving steam or hot Specication of Letters Patent.

Application filed October 1, 1906.

Patented May 17, 1910.

Serial No. 336,984.

water for heating the glue, which latter is received by the inner shell. The inner shell is preferably removable from the outer shell.

5 is an inlet pipe and 6 is an outlet pipe for steam or hot water, communicating with the compartment 4L and respectively having valves 7 8 therein. The pipe 5 may also serve as an inlet pipe when hot water is employed for heating the tank, and the compartment may also have an exhaust pipe 9 communicating therewith, which however is closed by a cap 10 when steam under pressure is used to heat the glue. A water-gage 11 having a glass gage-tube 12 may also communicate with the compartment 4. A faucet 18 communicates with the inner shell for discharging the glue. For permitting removal of the faucet when removing the inner shell, the faucet may have securing means somewhat similar to the means provided and hereinafter described for securing the thermometer-thimble in place. Thus 14 is a ferrule secured to the outer case and extending inwardly. The inner end of this ferrule abuts against the outer face of the inner shell. The ferrule is internally threaded and receives the threaded tube 15 of the faucet. A nut 16 screws over the inner end of this threaded tube and clamps the inner shell against the inner end of the ferrule 14. The tank may also be provided with a lid 17. The heating may also be accomplished by a flame under the tank.

21 is an indicator-case.

22 is an indicator-finger for indicating the temperature of the glue. This finger is secured to a shaft 23. The shaft 23 is actuated by a usual construction of thermometer which may for instance comprise a thermal spring 24 extending into a bulb 25 in ordinary and well-known manner.

In order to cause the heated glue to make contact with the bulb 25 for indicating the true temperature of the glue and to separate the bulb from the direct influence of the heat of the heating agency, and at the same time to place the bulb in such position that it will be out of the reach of the paddle or other stirrer that may be used to stir the glue, I provide the peculiar mounting for the temperature indicator shown and described.

26 is a ferrule rigidly secured to the outer shell and having an inner abutting end 27. This ferrule has an internally threaded bore.

A hollow cap 29 externally threaded as shown at 30, screws into this ferrule and takes through openings respectively in the outer and inner shells. A nut 35 screws over the inner end of the cap and securely clamps the outer face of the inner shell against the inner abutting end 2T of t-he ferrule. This construction prevents leakage of the heating agency and leakage of the glue into the heating compartment. A tight joint may be thus secured, especially as in practice the ferrule may be of iron and the inner shell of a softer metal or composition, as copper or brass. The cap has an outer head 34, which may take the form of a bolthead. The head has an internally threaded bore for receiving the threaded stud 3G of the thermometer case.

There is an insulated connection 4l in the shaft 23 for electrically insulating the finger 22 from the parts in rear of the shaft. A collar 42 takes about the shaft, the latter being journaled in said collar, and an electric connection 43 connects said collar with a binding-post 44 on the case 2l. The shaft 23 is journaled in an insulating bearing 45.

46 is a contact-finger which has a hub 47 journaled about the insulating bearing 45. A collar 48 takes about this hub and an electric connection 49 connects said lastnamed collar with a binding-post 50 on the case 2l.

5l is a second contact-finger journaled on the hub 47. The hub 47 makes contact with the collar 48.

52 is the face-plate of the indicator, an insulated bearing 53 insulating the faceplate from the contact-fingers and the collar 48. The insulated bearing 45 extends between the collars 42 4S and between the contact-fingers and the indicator-finger. This construction insulates the indicatorfinger from the contact-fingers, except when making contact therewith and acting as electric terminals as hereinafter explained, and also insulates said fingers from the case, and electrically connects the indicator-finger with the binding-post 44, and further electrically connects said contact-fingers with the binding-post 50. The contact-fingers are respectively provided with contact-stems 54 55 with which the indicator-finger is adapted to engage when the glue becomes excessively heated or drops to a heat below the desired normal. The binding-posts are electrically connected with an alarm shown as a bell 56 and with a source of electric energy shown as a battery 57 as by conductors 5S 59 GO. The markings on the face-plate represent degrees of heat.

I provide means for shifting the contactfingers, so that the alarm may be set for any desired range in degrees of heat it may be desired to apply to the glue. Thus 6l is the glass-front of the indicator-case.

(32 is a shifting-linger having a lug G3 adapted to engage the stems 54 55 for shifting the contact-fingers. The shifter-finger is secured toa shaft (34 mounted in a bearing 65 of the glass-front 6l and having a knob GG for turning the same. The shaft is slidable longitudinally in its bearing for bringing the lug (S3 within lateral range of the contact-stems 54 55, a spring (37 normally however retracting the shifter-finger out of range of said stems. If it is desired to shift the contact-fingers, the knob G6 is grasped and the shifting-finger is turned so as to bring its lug to either side either contactstem, and the shifting-finger is pushed inwardly, which brings it wit-hin lateral range of the stem of the contact-finger, the shifting-finger being then turned to bring the contact-finger to register with the desired mark on the indicator face representing the desired upward or downward limit of heat to which the glue is to be subjected. These limts of heat may vary with the different classes of glue, or the work to which the glue is to be put. Thus it has been found that a heat in excess of 1(30 degrees Fahrenheit will lessen the adhesive quality of the glue, and the longer the excessive heat is maintained the greater will be the detrimental effect, until the adhesive qualities of the glue are practically destroyed, so that instant remedy is desired, and is obtained by my improved device. The jelly, that is, the mixture of glue and water will become thinner as the degree of heat increases, with the result that, with the proper amount of glue for the mixture, the jelly will become too thin at an excessive heat, inducing the workmen to add an excessive amount of glue to obtain a proper consistency in the jelly, and therefore wasting glue. One contactfinger may therefore be set for instance at 1GO degrees.

It has been found that below 140 degrees Fahrenheit the spreading efficiency of the glue will be lessened, and the glue will not be received properly into the pores of the wood or other articles being glued, resulting in poor joints. It is therefore desirable that. the glue shall not go below 140 degrees Fahrenheit, and the other contact finger may therefore be shifted to register with the mark 140 on the dial. The heat of the glue may without detriment vary between these two points, but is preferably maintained as near 150 degrees Fahrenheit as possible, and as the heatvaries the indicator-finger may shift between the contact-fmgers. As soon, however, as the indicator-linger makes contact with the contact-stem on either contactfinger, electric circuit will be formed between the battery and alarm, and the bell will ring, thereby indicating the abnormal state of the glue, which may thereupon be forthwith remedied.

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

1. In combination, in a glue heater, a j acketed container comprising a thimble spanning the space of the jacket thereof and interrupting Said space and opening into the interior of the container, with a thermometer having a bulb in said thimble permanently located in the said interruption of said space and distanced from the wall of said thimble adjacent said opening for permitting the contents of the container' to contact said bulb and removing said bulb from direct influence of the temperature in said jacket, substantially as described.

2. The combination of a glue heater comprising an inner shell and an outer shell forming' a jacketed tank having a heatingcompartment between said shells, a thimble l releasably connecting said shells and opening into said inner shell, and a thermometerbulb secured in said thimble and permanently located between the planes of said shells and distanced from the wall of Said thimble adjacent said heating compartment but exposed at said opening for permitting the glue in said inner shell to contact with said bulb.

3. In a glue heater, the combination of an outer shell, an inner shell releasably received thereby and spaced from said outer shell for forming a heatingcompartment between said shells, pipes for conveying a heating agency secured to said outer shell, a thimble releasably connecting said shells and provided withl a lateral wall having an opening at the inner end thereof opening into said inner shell and having a closing wall at its outer end, the said thimble forming an interruption in said heating-compartment,

a thermometer having a bulb located within said thimble and secured in said outer end but distanced from said lat-eral wall for removing said bulb from direct influence of the heating agency in said heating compartment and permitting contact of the glue in said inner shell with said bulb, but removing said bulb from contact of a stirrer 1n said inner shell, said bulb being permanently located in the said interruption of said heating-compartment and outside the vertical plane of the interior of said inner shell, substantially as described 4. In a glue heater, the combination of an outer shell 3, a. removable inner glue-container shell 2, said shells having a heatingcompartment 4: therebetween, a hollow cap 29 releasably secured to both of said shells and having' a lateral wall spanning said heating-compartinent and opening into said inner shell, said hollow cap forming an interruption in said heating-compartment, a bulb secured in said hollow cap from its outer end and distanced from said lateral wall for removing it from direct influence of the heating-agency in said heating-compartment and permitting the glue in said inner shell to be received about said bulb, said bulb being within said hollow cap for removing it from danger of contact by a glue stirrer in said inner shell, and permanently located in the said interruption of said heating-compartment, substantially as described.

In testimony whereof I have subscribed my name hereto in the presence of two subscribing witnesses.

CLEMENS H. NIEMANN.

Witnesses Ti-Inononn C. JUNG, CORDELIA OHEARN.

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