US2830324A - Molds for rubber soled footwear - Google Patents

Molds for rubber soled footwear Download PDF

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US2830324A
US2830324A US287536A US28753652A US2830324A US 2830324 A US2830324 A US 2830324A US 287536 A US287536 A US 287536A US 28753652 A US28753652 A US 28753652A US 2830324 A US2830324 A US 2830324A
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Prior art keywords
last
rubber
sole
molds
frame
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US287536A
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Farmer Fred
Szerenyi Andrew
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Ro Search Inc
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Ro Search Inc
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Priority to US287536A priority Critical patent/US2830324A/en
Priority to JP28008434A priority patent/JPS4818903B1/ja
Priority to US730738A priority patent/US2932064A/en
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Publication of US2830324A publication Critical patent/US2830324A/en
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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D3/00—Lasts
    • A43D3/02—Lasts for making or repairing shoes
    • A43D3/023—Hinge constructions for articulated lasts
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D3/00—Lasts
    • A43D3/02—Lasts for making or repairing shoes
    • A43D3/024—Lasts with a fore part and heel section relatively slideable to one another along an inclined line of cut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/0009—Producing footwear by injection moulding; Apparatus therefor
    • B29D35/0018—Moulds
    • B29D35/0027—Last constructions; Mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/0009—Producing footwear by injection moulding; Apparatus therefor
    • B29D35/0018—Moulds
    • B29D35/0045—Sealing means for the mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/0054—Producing footwear by compression moulding, vulcanising or the like; Apparatus therefor
    • B29D35/0063—Moulds
    • B29D35/0072—Last constructions; Mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/0054—Producing footwear by compression moulding, vulcanising or the like; Apparatus therefor
    • B29D35/0063—Moulds
    • B29D35/009—Sealing means for the mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material

Definitions

  • the invention refers to molds as used for the manufacture of shoes with' soles 'containing rubber. Such molds commonly comprise a last to carry the upper, a frame to shape the outside rim of the sole, and a sole plate to shape the bottom surface of the sole. If the sole is made of dense and stifi rubber, the mold is closed and the rubber molded in a hydraulic press or by other power means. If the sole is made of porous rubber, it is customary to close and lock the mold by hand using a looking device which is part of the mold.
  • One object of the invention is to improve molds so that it becomes possible to manufacture footwear with a side rim of dense rubber without the use of costly hydraulic presses.
  • Another object of the invention is to improve the mold to permit the molding of rubber to uppers of heavy leather or other less flexible material, which 'hitherto could not be removed from the heated metal lasts of the common molds.
  • FIG. 1 a schematic side view of a mold according to the invention
  • Figs. 2 and 3 show in larger scale the last, forming part of the mold of Fig. 1, in the closed and open position respectively.
  • the mold shown in Fig. 1 consists of a base plate 1 carrying a bottom plate 2 with a protrusion 18 shaped to form the bottom surface and the inside surface of the side rim of the sole.
  • the outside surface and the upper surface of the welt or side rim is shaped by the frame 4 with the lip 19, usually split lengthwise to facilitate demolding of the sole.
  • a frame holder 5 holds the parts of the frame 4 together and is supported by springs 17.
  • the last 6 can be placed upon the frame 4.
  • a locking arm 11 is fastened with the hingle 15 to the base plate 1, which also carries through a hinge 14 a lockng loop 12, held in the locking position by a knob 13 of the arm 11.
  • That arm carries a pressure screw 9, which can 'be actuated by the handwheel 10 so as to transmit pressure through the plate 8 and the adjusting screws 16 to the top 7 of the last 6.
  • the last 6 is divided in such manner that a relatively small part of the heel and the so-called quarter can be moved, as shown in Fig. 3, by a toggle lever arrangement 24, fastened to the projections 22 and 23 of the heel part and the main part of the last respectively
  • the surface separating the heel part 21 from the main part of the heel has the geometric shape of a cylnder with the center line 26 located at the instep of the last. This is essential not only because it permits effective foreshortening of the last while in the upper, but also because it permits good fit along the divding surface and with it good heat transfer from the heated main part of the heel to the part 21.
  • material to form a solid rubber side rim or welt such as a vulcanizable rubber mix, is placed into the corner formed by the bottom plate 2 and the frame 4.
  • the upper is placed on the foreshortened last 6, the toggle 25 closed and thereby the upper A e ,2,830324 pa ente& Apr. 15, 1958 brought into the desired shape, so that it can be located' against the lip 19 of the frame 4.
  • the arm ll'then is 'moved into the position' shown in Fig. 1 and the locking arm ,12 will hold it there.
  • the handwheel 10 ⁇ the last 6 withthe upper is moved downwards, first against the frame 4 until atight seal is obtained between the lip 19 and the upper.
  • the insert 20 located in the bottom plate 2 might be removed if only a side rim or a welt of solid rubber is desired and the sole or mid-sole is to be applied in a later operation. Very often it is of advantage to leave the insert 20 in the position shown, and to fill the space between the insert and the shoe bottom with a mix for a porous sole. Such mix will mold and vulcanize without any outside pressure. The shoe, removed from the mold after the vulcanization will be ready for the application of a tread-sole. While the rib 18 is shown as an integral part of the bottom plate 2, it might be of advantage for certain types of shoes to make the rib 18 a separate piece to limit the inside surface of the welt or side rim. Such separate piece might be still a permanent part of the mold or might be a pressure resistant, stiff strip of material which becomes part of the sole.
  • the mold according to the invention is not only for the molding of natural rubber but also for any other natural or synthetic elastomer or rubber like qualities.
  • the last as described above will be useful not only for the molding of side-rims or welts only but also for the molding of full soles as it permits the combination of high strength and uniform heating with the advantages of a fore-shortenable last.
  • the main part of the last can easily accommodate enough electric heating elements 28 to secure adequate and uniform heating.
  • the bottom surface of the last is formed by removable pieces 29 and 30, located in the last by pins 31 and held by set-screws 32 pressing against the preferably tapered pins.
  • the sole surface of the last is correspondingly un-interrupted and smooth so as to avoid unsightly markings on the insole during the moldng. If the pattern of the up-per changes, it is sufiicient to replace the parts 29 and 30, without replacing and re-adjusting the whole last.
  • a mold for the molding and vulcanization of rubber in situ to a shoe upper comprising a last to carry said upper, a frame to form the top and side surface of a welt, and a bottom plate, means to separate the inside of said welt from the center of the sole, said means comprising a projection uniformly spaced inside of the molding frame around the periphery of said sole, and means to exert pressure upon the rubber mass confined between said frame and said projection.
  • a mold for the molding and vulcanization of rubber in situ to a shoe upper comprsing a last to carry said upper, a frame to form the top and side surface of a welt, and a bottom plate, means to separate the inside of said welt from the center of the sole, said means comprising a projection uniformly spaced inside of the molding frame around the periphery of said sole, and means to exert pressure upon the rubber mass confined between said frame 'and said projection, said last divided intoa main par-t nd :a heel part alnga ⁇ cylindrical surface extending' 4 *upper, a frame to lforrnuthe top and sidesurface of a we1t, and a bottom tplate, means to separate thein si de of said Welt from the center of the sole, said means 'comprising a projecton unifo 'mly spaced inside of the molding frame around the periphery of said sole, and means to exert pressure upon the ⁇ rubber mass confined between -s'aid frarhe and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

&830324 F. FARMER ET AL MOLDS FOR RUBBER SOLED FOOTWEAR Aprl 15, 1958 2 Sheets-Sheet 1 Filed May 15, 1952 IN V N TORS Apri! 5, 1958 F. FARMER ETAL 2,830,324
MOLDS FOR RUBBER SOLED FOOTWEAR 2 Sheets-Sheet 2 Filed May 13. 1952 United' States Patent O z,s30,324 MOLDS FORRUBBER SOLED FOOTWEAR Fred Farner and Andrew Szerenyi, Waynesville, N. C.,
`assignors to Ro-Search, Inc., Waynesvlle, N. C., a corporation of North Carolina .Application May13, 1952, Serial No. %7,536
- 4 Claims.' (Cl.18-34) The invention refers to molds as used for the manufacture of shoes with' soles 'containing rubber. Such molds commonly comprise a last to carry the upper, a frame to shape the outside rim of the sole, and a sole plate to shape the bottom surface of the sole. If the sole is made of dense and stifi rubber, the mold is closed and the rubber molded in a hydraulic press or by other power means. If the sole is made of porous rubber, it is customary to close and lock the mold by hand using a looking device which is part of the mold.
One object of the invention is to improve molds so that it becomes possible to manufacture footwear with a side rim of dense rubber without the use of costly hydraulic presses. I
Another object of the invention is to improve the mold to permit the molding of rubber to uppers of heavy leather or other less flexible material, which 'hitherto could not be removed from the heated metal lasts of the common molds.
Other objects and characteristics of the nvention are clarified in connection with the drawings, which show in Fig. 1 a schematic side view of a mold according to the invention, while Figs. 2 and 3 show in larger scale the last, forming part of the mold of Fig. 1, in the closed and open position respectively.
The mold shown in Fig. 1 consists of a base plate 1 carrying a bottom plate 2 with a protrusion 18 shaped to form the bottom surface and the inside surface of the side rim of the sole. The outside surface and the upper surface of the welt or side rim is shaped by the frame 4 with the lip 19, usually split lengthwise to facilitate demolding of the sole. A frame holder 5 holds the parts of the frame 4 together and is supported by springs 17. The last 6 can be placed upon the frame 4. A locking arm 11 is fastened with the hingle 15 to the base plate 1, which also carries through a hinge 14 a lockng loop 12, held in the locking position by a knob 13 of the arm 11. That arm carries a pressure screw 9, which can 'be actuated by the handwheel 10 so as to transmit pressure through the plate 8 and the adjusting screws 16 to the top 7 of the last 6. The last 6 is divided in such manner that a relatively small part of the heel and the so-called quarter can be moved, as shown in Fig. 3, by a toggle lever arrangement 24, fastened to the projections 22 and 23 of the heel part and the main part of the last respectively The surface separating the heel part 21 from the main part of the heel has the geometric shape of a cylnder with the center line 26 located at the instep of the last. This is essential not only because it permits effective foreshortening of the last while in the upper, but also because it permits good fit along the divding surface and with it good heat transfer from the heated main part of the heel to the part 21.
To use the old described above, material to form a solid rubber side rim or welt, such as a vulcanizable rubber mix, is placed into the corner formed by the bottom plate 2 and the frame 4. The upper is placed on the foreshortened last 6, the toggle 25 closed and thereby the upper A e ,2,830324 pa ente& Apr. 15, 1958 brought into the desired shape, so that it can be located' against the lip 19 of the frame 4. The arm ll'then is 'moved into the position' shown in Fig. 1 and the locking arm ,12 will hold it there. By turning the handwheel 10 `the last 6 withthe upper is moved downwards, first against the frame 4 until atight seal is obtained between the lip 19 and the upper. As the movement of the last continues against the resistance of the springs 17, the upper together V with ,the frame 4 moves against the rib 18 and molds the rubber mix against the upper, As pressure is exerted only in the area of the side rim or welt, the hand opera- 'Any surplus of rubber may escape in the direction of the movement of the last through a gap 27, between frame `4 and bottom plate 2 of between the rib 18 and the shoe bottom.
The insert 20 located in the bottom plate 2 might be removed if only a side rim or a welt of solid rubber is desired and the sole or mid-sole is to be applied in a later operation. Very often it is of advantage to leave the insert 20 in the position shown, and to fill the space between the insert and the shoe bottom with a mix for a porous sole. Such mix will mold and vulcanize without any outside pressure. The shoe, removed from the mold after the vulcanization will be ready for the application of a tread-sole. While the rib 18 is shown as an integral part of the bottom plate 2, it might be of advantage for certain types of shoes to make the rib 18 a separate piece to limit the inside surface of the welt or side rim. Such separate piece might be still a permanent part of the mold or might be a pressure resistant, stiff strip of material which becomes part of the sole.
The mold according to the invention is not only for the molding of natural rubber but also for any other natural or synthetic elastomer or rubber like qualities. The last as described above will be useful not only for the molding of side-rims or welts only but also for the molding of full soles as it permits the combination of high strength and uniform heating with the advantages of a fore-shortenable last. As can be seen in Fig. 3 and Fig. 3 the main part of the last can easily accommodate enough electric heating elements 28 to secure adequate and uniform heating. As further improvement the bottom surface of the last is formed by removable pieces 29 and 30, located in the last by pins 31 and held by set-screws 32 pressing against the preferably tapered pins. The sole surface of the last is correspondingly un-interrupted and smooth so as to avoid unsightly markings on the insole during the moldng. If the pattern of the up-per changes, it is sufiicient to replace the parts 29 and 30, without replacing and re-adjusting the whole last.
What We claim is:
1. A mold for the molding and vulcanization of rubber in situ to a shoe upper, comprising a last to carry said upper, a frame to form the top and side surface of a welt, and a bottom plate, means to separate the inside of said welt from the center of the sole, said means comprising a projection uniformly spaced inside of the molding frame around the periphery of said sole, and means to exert pressure upon the rubber mass confined between said frame and said projection.
2. A mold for the molding and vulcanization of rubber in situ to a shoe upper, comprsing a last to carry said upper, a frame to form the top and side surface of a welt, and a bottom plate, means to separate the inside of said welt from the center of the sole, said means comprising a projection uniformly spaced inside of the molding frame around the periphery of said sole, and means to exert pressure upon the rubber mass confined between said frame 'and said projection, said last divided intoa main par-t nd :a heel part alnga `cylindrical surface extending' 4 *upper, a frame to lforrnuthe top and sidesurface of a we1t, and a bottom tplate, means to separate thein si de of said Welt from the center of the sole, said means 'comprising a projecton unifo 'mly spaced inside of the molding frame around the periphery of said sole, and means to exert pressure upon the` rubber mass confined between -s'aid frarhe and 'said `projection,- said last. divided into a rai `p`rt`fiid he'el p`r't,fs'ad `p`art`s connected to each tfir' By jtggl lilers whichgfofe-shorten said `last when pf d nfth'eir closed position hold said parts to pret a citn sble s liffa.
in `s`it'u to a 'sho'e u'pp 'r, co'pris'ing a last to carrysaid uppr, a" fime to form the top and side surface of a We`1t,`and'a` bottom plate,'niean`s t'o separate the inside of said welt from the center of the sole, said means compris- 'ing si projecton uiformly s'pced inside of the moldng frame around the periphery of said sole, and means to exert pressure ujdn the rubber mass confined between said frame and said projection, said last divided into a i main part and heel part movable in relaton thereto and carrying a replaceable sole plate offering a smooth surface towards the nsole and held by pins enterng the main body of said last'.
Rferen'csited in the file of this patent UNiTEDsTA TEs PATENTS 399227 Healey Mar. 5, 1889 411,6 22 Smith Sept. 24, 1889 574',239 `Butte` field Dec. 29, 1896 1,660,881 Nie1sen Feb. 28, 1928 1,855,098 Collins Apr. 19, 1932 2,178,086 Szerenyi Oct. 31, 1939 2,651,11s Root Sept. s, 1953 *FOREIGN `PATENTS '617,22'9
US287536A 1952-05-13 1952-05-13 Molds for rubber soled footwear Expired - Lifetime US2830324A (en)

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US287536A US2830324A (en) 1952-05-13 1952-05-13 Molds for rubber soled footwear
JP28008434A JPS4818903B1 (en) 1952-05-13 1953-05-12
US730738A US2932064A (en) 1952-05-13 1958-03-31 Lasts for rubber soled footwear

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2961707A (en) * 1957-10-29 1960-11-29 Marbill Company Mold for making shoes
DE1129867B (en) * 1961-02-21 1962-05-17 Phoenix Gummiwerke Ag Vulcanizing or welding mold for footwear, with a frame and a movable headstamp
US3109701A (en) * 1960-01-08 1963-11-05 Jacquet Gabriel Method for producing shoes with molded soles of rubber or plastic material
US3343219A (en) * 1965-10-18 1967-09-26 Int Vulcanizing Corp Shoe sole molding apparatus
US3454992A (en) * 1965-08-19 1969-07-15 Phoenix Gummiwerke Ag Boot casting
US3500502A (en) * 1966-10-05 1970-03-17 Desma Werke Gmbh Mold for the production of boots of rubber or plastics material
US3523333A (en) * 1967-09-22 1970-08-11 Usm Corp Sole mold assemblies
US20110177186A1 (en) * 2010-01-19 2011-07-21 Ming Te Chen Adjustable Shoe Mold Set

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US399227A (en) * 1889-03-05 healey
US411622A (en) * 1889-09-24 Edward spencer smith
US574239A (en) * 1896-12-29 Method of vulcanizing rubber soles to shoes
US1660881A (en) * 1926-03-17 1928-02-28 Nielsen Frederik Vulcanizing rubber soles to fabric or other uppers
US1855098A (en) * 1930-02-14 1932-04-19 Collins Charles Horace Russell Apparatus for molding and curing footwear
US2178086A (en) * 1933-08-29 1939-10-31 Heinz Rollmann Method for the manufacture of footwear
GB617229A (en) * 1944-04-24 1949-02-02 Bata Improvements relating to lasts for pressing and vulcanised rubber footwear
US2651118A (en) * 1948-10-27 1953-09-08 United Shoe Machinery Corp Molding soles and heels to uppers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US399227A (en) * 1889-03-05 healey
US411622A (en) * 1889-09-24 Edward spencer smith
US574239A (en) * 1896-12-29 Method of vulcanizing rubber soles to shoes
US1660881A (en) * 1926-03-17 1928-02-28 Nielsen Frederik Vulcanizing rubber soles to fabric or other uppers
US1855098A (en) * 1930-02-14 1932-04-19 Collins Charles Horace Russell Apparatus for molding and curing footwear
US2178086A (en) * 1933-08-29 1939-10-31 Heinz Rollmann Method for the manufacture of footwear
GB617229A (en) * 1944-04-24 1949-02-02 Bata Improvements relating to lasts for pressing and vulcanised rubber footwear
US2651118A (en) * 1948-10-27 1953-09-08 United Shoe Machinery Corp Molding soles and heels to uppers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2961707A (en) * 1957-10-29 1960-11-29 Marbill Company Mold for making shoes
US3109701A (en) * 1960-01-08 1963-11-05 Jacquet Gabriel Method for producing shoes with molded soles of rubber or plastic material
DE1129867B (en) * 1961-02-21 1962-05-17 Phoenix Gummiwerke Ag Vulcanizing or welding mold for footwear, with a frame and a movable headstamp
US3454992A (en) * 1965-08-19 1969-07-15 Phoenix Gummiwerke Ag Boot casting
US3343219A (en) * 1965-10-18 1967-09-26 Int Vulcanizing Corp Shoe sole molding apparatus
US3500502A (en) * 1966-10-05 1970-03-17 Desma Werke Gmbh Mold for the production of boots of rubber or plastics material
US3523333A (en) * 1967-09-22 1970-08-11 Usm Corp Sole mold assemblies
US20110177186A1 (en) * 2010-01-19 2011-07-21 Ming Te Chen Adjustable Shoe Mold Set
US8540502B2 (en) * 2010-01-19 2013-09-24 Ming Te Chen Adjustable shoe mold set

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