US1734478A - Top-boct and process for manufacturing - Google Patents

Description

Nov. 5, 1929. A. A. GLIDDEN ET AL TOP BOOT AND PROCESS FOR MANUFACTURING Filed June 11, 1928 2 Sheets-Sheet Nov. 5, 1929. A. GLIDDEN ET AL 1,734,478

TOP BOOT AND PROCESS FOR MANUFACTURING Filed June 11, 1928 2 Sheets-Sheet 2 Patented Nov. 5, 1929 4 UNITED STATES PATENT OFFICE ALFRED A. GLIDDEN AND THODIAS lri. KNOVJLAND, OF WATEIITOWN, AND ARTHUR M.

GR-EIM, OF DORCHESTER, MASSACHUSETTS,

ASSIG-NORS TO HOOD RUBBER COMPANY,

OF WATERTOVJN, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS TOP-BOOT AND YROOESS FOR MANUFACTURING Application filed June 11, 1928. Serial No. 284,302.

This invention relates to an improved top boot and process of manufacture.

The object or the invention is to provide a molded boot with an extended top, the foot and leg of the boot being composed of rubber compound vulcanized in mold, the top being vulcanized, but not necessarily vulcanized in a mold.

The object of the invention fruither is to provide a top boot in which the foot and leg portion are manufactured and vulcanized separately from the top portion, and then the two vulcanized members, the boot, including the foot portion and the leg portion, are joined to the top portion in a manner hereinafter se forth. The advantage secured by this con struetion, and by the method whereby it is secured, is that the top can be made of one type of rubber compound and the leg and foot portion and the sole can be formed of another composition, including the rubber compound and fabric. The top portion may be made only of rubber compound material, or a combination of rubber compound material and fabric, as may be desired.

Another object 01" the method of this invention isto be able'to manui actLu-e atop boot with a substantially thicker all rubber compound topthan has heretofore been used, which will stand up without the aid of res tening to the belt, and this type of top also has an advantage, namely, if a man kneels and his knee engages the top portion, it will stretch, whereas the ordinary article, as heretofore manufactured, has a lining which stretches very little, if any, and therefore wrinkles very badly, these wrinkles produc ing early cracking in the top.

By the method of this invention, the finished boot has a top which is elastic and which may be madein any desired manner with any desired compounds, which itmay be desirable to have different from the compounds or compositions of material forming the leg,

foot and sole portions of the boot. To these ends, therefore, the boot, including the sole, foot and'leg portions, is manufactured and vulcanized separately from the top portion of the boot and then the two vulcanized members, namely, the boot with its leg, and the top, are subsequently joined together and vulcanized.

In addition to the advantages hereinbefore set forth and attained by our improved process, it will be seen that by separately manufacturing and vulcanizing the boot with its leg, and the top, the most desirable length of time and degree ofheat can be utilized for the boot and its leg and for the top, where the boot and its leg are composed of a diflerent compound or different composition of materials from the top as, for example, where the top is composed of a pure rubber compound and the boot may be composed of rubber compound with fabric or other materials embodied therein. The length of time and the degree of heat employed for the boot, in order to properly vulcanize it, especially considering the thickness of the sole of the boot, would be difierent from the time and degree of heat necessary to properly vulcanize the top, and by ourimproved process of manufacture we can vulcanize the boot and top separa-tely and obtain the best results for both the boot and the top in this manner, whereas, when the wholeboot including the top was vulcanized at one operation, these results could not be attained due to the fact, for example, that the degree of heatand length of time necessary to vulcanize the boot with its thick sole was entirely inadequate for the time and degree of heat required to vulcanize a top which, for example, might be made of pure rubber compound, in which instance the pure rubber compound top when subjected to the degree of heat and for the length of time necessary to vulcanize the boot with its thick sole would be in some cases rendered plastic to an impracticable extent and thus ruined.

The inventionconsists in the improved top boot and process of manufacture therefor set forth in thefollowing specification and particularly pointed out in the claims.

Referring to the drawings Figure 1 is a blank for the boot top.

Fig. 2 illustrates the blank positioned upon a form. I

Fig. 3 is a front elevation broken away and shown in section of the boot top.

n all Fig. 4c is an enlarged sectional elevation illustrating the lower portion of the boot top and the upper portion of the boot leg spliced together.

Fig. 5 is a side elevation partly broken away and shown in section of the boot without the top portion.

Fig. 6 is a side elevation of an improved form of vulcanizer by which a portion of the process of this invention is carried into practical operation, the same forming the subject matter of a separate application Serial No. 281,384 filed May 21, 1928, entitled Vulcanizer for top boots, a portion of a boot leg and top positioned thereon and shown in section.

Fig. '4' is an end elevation of the vulcanizer. Fig. 8 is a wiring diagram for the vulcanizer.

Like numerals refer to like parts in the several views of the drawings.

In carrying our improved process of manufacture into practical operation. blank 10, Fig. 1, is wrapped around a form 11, as illustrated in Fig. 2, and the edges are cemented together at 12. The boot top 13 is thus formed and is then vulcanized. After it is vulcanized it is trimmed off to the proper height around the bottom edge 1a thereof. The bottom edge is then skived oi as at 15, Fig. 3, on the inner face thereof.

The boot- 16, comprising a foot portion 17 and a leg portion 18, is vulcanized in a heated mold as shown and described in United States Letters Patent No. 1,692,828, issued November 27, 1928, and subsequently the upper edge is trimmed and skived or buffed off on the outside as at 19. Cement is then applied to the bevelled edges of the boot and the top. The cement is then allowed to dry for about two hours and cement is again applied thereto. The bevelled upper edge of the boot and the bevelled lower edge of the top are then placed together, cement to cement, as evenly as possible and rolled down thoroughly into con tact with each other with a hand roller. The open end of the boot thus formed is slipped over a mandrel 20, Fig. 6, and is pulled up snugly on the tapered surface of said mandrel, the spliced portion resting on the mandrel is then wrapped with a strip of cloth and the boot is then allowed to vulcanize for about twelve minutes, the latter is then removed and tllQ'lOOOll is slipped off the mandrel.

Referring to Fig. 6, it will be seen that he sides 21 of the mandrel 2O converge and that the mandrel is oval shaped transversely thereof, as clearly shown in Fig. 7 22 is a thermometer inserted in the mandrel 20. 23 and 2a are electric heating elements which preferably extend through the mandrel. 25 is an electric control bulb. The mandrel is supported by an elongated bracket 26 which is fastened toa suitable support 27. The

electric heating elements are heated as follows :Referring to Fig. 8, is the vulcanizer with the converging sides 21, 21. The control bulb is connected through a tube 29 to a Bourdon tube 30 in the thermostat 31. When the temperature of the mandrel arrives at a predetermined degree, the pressure generated by the volatile liquid in the bulb 25 is transmitted through the tube 29 to the Bourdon tube 30, which causes the outer end of the Bourdon tube to move and open a pair of electrical contacts 32 and 33. This opens or closes the heater circuit 34 consisting of a wire 35 which leads in through a fuse box 36 to the contact 32. The other contact 33 is connected by wires 37 to the heaters 23 and 2a and the electric current returns from the heater by wires 38 through a switch 39 and through the fuse box 36, so that as the temperature of the mandrel arrives at a predetermined degree the heat will be shut off from the heating elements 23 and 24 and when the temperature lowers these heating elements will again be supplied with electric current through the circuit 37.

lVe claim:

1. A top boot having, in combination, a vulcanized molded foot and leg portion of rubber compound, the upper end of said leg portion being bevelled, and a vulcanized top portion of rubber compound, the lower end of the top portion being bevelled and attached to the bevelled upper end of the leg portion by vulcanizable adhesive material locally vulcanized thereto.

2. The process of manufacturing a top boot which consists in manufacturing a boot of rubber compound and vulcanizing the same, then trimming the upper edge of the boot leg, then bevelling the said upper edge, and in manufacturing a boot top of rubber compound and Vulcanizing the same, then bevelling the lower edge thereof, then attaching the lower edge of the boot top to the upper edge of the boot leg by vulcanizing adhesive material, and then locally vulcanizing the said edges together.

3. A step in the process of manufacturing a top boot which consists in attaching the bevelled lower edge of a boot top of rubber compound to the bevelled upper edge of a boot of rubber compound and locally vulcanizing the said edges together.

4. A step in the process of manufacturing a top boot which consists in locally vulcanizing together the bevelled lower edge of a boot top of rubber comgound and the bevelled upper edge of aboot of rubber compound.

in testimony whereof we have hereunto set our hands.

ALFRED A. GLIDDEN. THOR Iris M. KNOlVLAND. ARTHUR M. GREIM.

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