Патент USA US2114708код для вставки
2,114,758 Patented Apr. 19, 1938 UNITED STATES PATENT OFFECE 2,114,708 MEANS FOR MANUFACTURING FOOTWEAR David Gordon Gash, Balaclava, Victoria, Australia Application April 23, 1936, Serial No. 75,997 In Australia April 26, 1935 2 Claims. (C1. liti-_42) cementing together both the parts to be con last the closure of the sections under pressure effects a positive conforming of the unvulcanized rubber to the shape of the last and selected pres sure sole and heel plate to bring the moulded shoe or boot to the condition of being cooked in UX a vulcanizer or other practical apparatus. A further important feature embodied in the invention is that the soles .and heels are com posed of a rubber having a substantially harder composition than that of the upper while the sole joined and the lining of canvas or the like which may have formed thereon a tread of desired con This invention has reference to a method of and means for manufacturing footwear and has been devised to provide footwear which is mould ed in lieu of being constructed in various parts 5 to form the completed shape. It has been the .accepted practice in the manu facture of footwear particularly when moulding rubber or like resilient shoes or boots to form the same in various sections which are united by necessitated costly and tedious operations while in the finished product the parts had a tendency to disunite more particularly the sole from the 15 upper canvas. The main object of the present invention is to provide a method of manufacturing footwear particularly rubber boots and shoes in one com plete unitary structure and wherein the above disadvantages and defects are obviated, the ñn 20 ished article being of the necessary resiliency and having the quality and durability to withstand normal use without becoming misshapen, which is a detrimental feature of leather footwear, while the normal shape of the shoe or boot conforms to the shape of the foot when removed therefrom. With the above object in view the» present in* vention consists in moulding footwear in one complete structure and wherein the last or core 30 which is of a standard shape is ñrstly coated with uncured rubber after which the sole and heel portion is shaped on the last by pressure whereby the form may be cooked in a vulcanizer with the resultant moulded product being a boo-t or shoe 35 formed in one complete unit of the desired shape and size. An important feature embodied in my inven tion is that during the application of the un cured rubber to thel last or core it may be suit 40 ably coloured and shaped to a desired configura tion, while the sole and heel may be constructed of rubber having less resiliency or elasticity than the material employed for the upper. Another important feature embodied in my 45 invention is the provision of means for moulding a shoe or boot by the method described and by the employment of said means moulding the said footwear in one complete structure of a desired shape the means preferably comprising a mould 50 constructed in two correspondingly shaped sec tions between which may seat a last or core of selected size while a selected pressure plate is associated with said sections to seat therebe tween and over the base of the last or core where 55 by .after the rubber or material is coated on said figuration. The invention will be hereinafter more par ticularly described with reference to the accom panying drawing showing a mould for carrying 15 out the method according to the invention and in which: Figure 1 is a plan view of one section of the mould having the core and sole pressure plate positioned therein. Figure 2 is a plan view of the co-acting section of the mould. Figure 3 is a sectional elevation of the assem bled mould sections with the core and sole pres sure plate in position. Figure 4 is an elevation of the core or last of the mould. I Figure 5 is a sectional elevation through line 5_5 of Figure 4. Figure 6 is an elevation of the sole and heel pressure plate. Figure ’7 is a sectional elevation through line 'l-‘I of Figure 6. According to one form of carrying my inven tion into practical effect with the method pre# viously described I provide a lnould comprising two co-acting sections IIJ each section being hol 5 lowed to form `a recess II therein adapted to re ceive with a predetermined clearance one side or portion of a correspondingly shaped last or core I 2 which conforms to a standard shape. Formed adjacent the base of the recess II in each sec. tion IIJ is an extended recess I3 adapted to re ceive a sole and heel pressure plate I4 this latter recess I3 being slightly deeper than the recess 45 II shaped to receive the last I2 for the purpose of providing a welt on the moulded shoe or boot. The back of the pressure plate I4 for form ing the sole and heel is formed With oppositely disposed tapered cam surfaces I5 extending out 50 wardly from each edge and converging in the approximate centre of said plate I4, correspond ingly tapered cam surfaces I5 being provided on the adjacent edges of the moulding sections IU. Such tapered surfaces I5 and I6 are for the pur 55 2 2,114,708 pose of facilitating the entry of the pressure plate M when the last i2 is in position and is coated with uncured rubber ll the said pressure plate Iii being forced in a direction parallel to the interface between the sections into correct position when the two sections Ill of the mould after the product has been vulcanized. The effective surface or recess II of the mould section Iii may be provided with projections or indentations 23 in order to impart to the exterior of the shoe a desired pattern or configuration are assembled. and similarly the last l2 may be provided with in In order to prevent the last I2 from being forced out of position when the sections I0 of dentations 24 on the back of the heel in order that the interior of the moulded product may have gripping means formed thereon such as a 10 10 the mould are being assembled I provide one or more keyways or grooves I8 on the upper or po plurality of spaced projections. sitioning portion of the last i2 which keyways With the last I2 having the coating of uncured i8 are adapted to engage with projecting keys rubber Il of suitable composition and uncured or ridges i9 formed on the mould section lo. The hardened sole and heel applied thereto in the op erative position and the pressure plate I4 in serted into the section IU of the mould, the co acting section Ii! of the mould is then placed in kcyways i3 and keys i9 are preferably made with inter-fitting inclined cam faces so as to guide the core into its proper position when the mould sec tions are moved together to close the mould. The core is then held firmly in its proper position 20 by interengagement of 'the cam faces of the keys and keyways until the mould is opened. Conveniently positioned on the adjacent faces of the co-acting sections ill of the mould I pro vide small channels 2l) which extend to the edge 25 of the mould sections Iâ] these channels 28 be ing for the purpose of permitting the discharge of excess material that is forced from the mould during operation. Vso position where eyelets (not shown) are inserted A separate mould may be made for each last l2 with pressure plate ld but it is preferable to incorporate a pair of right and left lasts I2 and position and pressure applied thereto thereby forcing the sole and heel pressure plate I4 down wardly and at the same time inwardly against 20 the sole of the last i2. While the co-acting sec tions I0 of the mould are held together under pressure suitable fastening means associated with said sections iii are brought into operation, the said fastening means preferably comprising a piv 25 otal bolt 25 adapted to engage projecting lugs 26 on the opposite section Iû of the mould. The mould is then placed in a suitable vulcanizer pressure plates M in the one section l0 as illus (not shown) for a period su?licient to cook the uncured rubber Il after which the mould is re 30 moved and opened, and the core or last I2 re moved from the vulcanized rubber shoe or boot as trated in the accompanying drawing. the case may be. In building up a last I2 the said last I2 is re 35 moved from divided sections i@ of the mould and coated with a layer of uncured rubber I1 of predetermined thickness; any portion of the coating of rubber may be suitably covered or have a pattern imparted thereto, a coating of rubber The shoe is then dressed and prepared to re move any excess material formed at the joint 35 of the mould sections i@ and suitable eyelets (not shown) incorporated in the front of the shoe for lacing purposes, the tongue (not shown) of the shoe being inserted and fixed to the upper by the 40 of harder composition if desired being applied to lower eyelets. the sole of the last I2 for the purpose of forming the sole and heel of the boot or shoe. The last I2 is then placed in position in one of the corre spondingly shaped recesses i I formed on each in 45 ternal side of the co-acting sections IE of the mould. The pressure plate I4 is then inserted into the mould section I5) carrying the last l2, in the re cess I3 directly below the bottom of the last i2 50 but owing to the thickness of the uncured rubber Il’ this pressure plate Iii is prevented from being correctly positioned without pressure being ap plied thereto, but due to the taper I6 on the back face of the pressure plate ifi the entry of said 55 plate Iii into the mould section Iâl is made pos sible. The interaction between the inclined faces It of the mould on the inclined faces I5 on the pressure plate forces the pressure plate toward In order to obtain a predetermined thickness of the sole of the shoe varying sized pressure sole plates I4 are provided for the purpose. DoWel pins 2l and co-acting dowel openings 28 are also the core member I2 as the mould sections move 60 toward each other until the pressure plate occu pies its correct position within the cavity of the mould. The surface of the heel and sole plate I4 ad jacent the bottom of the last I2 may beof de 65 sired formation according to requirements and may have formed thereon projections 2l or the like for imparting a desired tread on the sole of the iînished product. Should it be desired the heel section 22 of un 70 cured rubber El may be stamped out and placed adjacent the heel of the last i2 prior to the in sertion of the heel pressure plate Ill and reinforc ing fabric (not shown) is incorporated with the uncured rubber lll forming the upper of the shoe 75 in order to prevent fracture of the rubber at a 40 provided on the mould sections IB to ensure cor 45 rect alignment. It will be understood that the product obtained by the method herein described has the natural appearance of a standard shaped last and from appearance is identical with a leather shoe hav 50 ing a Welted sole thereon. What I claim as my invention and desire to secure by Letters Patent is:-- p 1. A mould for forming one-piece rubber shoes, which comprises a pair of mould sections having 55 recesses therein cooperating to form a cavity when the mould is closed and having core positioning portions, and a unitary core member having a core portion in the shape of a shoe last adapted to be spaced from both mould sections when in 60 position in the closed mould and a positioning portion integral with said core portion, said core positioning portions of both the core member and the mould sections comprising interñtting ridges and grooves with inclined cam faces adapted to 65 move said core portion into proper position rela tive to the mould sections when the mould sec tions are moved together to close the mould. 2. A mould for forming one-piece rubber shoes, which comprises a pair of mould sections having 70 recesses therein cooperating to form a cavity when the mould is closed and having core posi tioning portions, a unitary core member having a core portion in the shape of a shoe last adapted to be spaced from both mould sections when in 75 2,114,708 position in the closed mould and a positioning portion integral with said core portion, said core positioning portions of both the Core member and the mould sections comprising interñtting ridges and grooves with inclined cam faces adapted to move said core portion into proper position rela tive to the mould sections when the mould sec 3 tions are moved together to close the mould, and eJ sole pressure plate in said cavity opposite the bottom of said core, said sole pressure plate and mould sections having coasting cam faces to force said plate toward said core when the mould 5 sections are moved together to close the mould. DAVID GORDON GASH.