US2932064A - Lasts for rubber soled footwear - Google Patents

Lasts for rubber soled footwear Download PDF

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Publication number
US2932064A
US2932064A US730738A US73073858A US2932064A US 2932064 A US2932064 A US 2932064A US 730738 A US730738 A US 730738A US 73073858 A US73073858 A US 73073858A US 2932064 A US2932064 A US 2932064A
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United States
Prior art keywords
last
lasts
heel
footwear
rubber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US730738A
Inventor
Farmer Fred
Szerenyi Andrew
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ro Search Inc
Original Assignee
Ro Search Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US287536A external-priority patent/US2830324A/en
Application filed by Ro Search Inc filed Critical Ro Search Inc
Priority to US730738A priority Critical patent/US2932064A/en
Application granted granted Critical
Publication of US2932064A publication Critical patent/US2932064A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • 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
    • A43D3/026—Lasts for making rubber footwear or for vulcanizing rubber soles to footwear
    • 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

  • Patent No. 2,830,324 dated April 15, 1958. Divided and this application March 31, 1958, Serial No. 730,738
  • One object of the invention is to improve such lasts so that it becomes possible to move the heel piece without danger of pinching the upper or its lining between the heel piece and the main portion of the last.
  • Another object of the invention is to improve the last to permit the mounting of uppers of heavy leather or other less flexible material, which hitherto could not be easily mounted and stretched on the heated metal lasts.
  • the last shown in Fig. 1 consists of a base plate 1 carrying a main portion "6 and a movable heel portion 21 with an extension 22 to which a link 25 is pivotally connected.
  • a further link 24 is pivotally connected to the link 25 and an extension 23 of the base plate 7 so as to present a toggle connection.
  • the surface separating the heel part 21 from the main part of the heel has the geometric shape of a cylinder surface 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 dividing surface and with it good heat transfer from the heated main part of the heel to the part 21.
  • the dividing surface maintains its curvature throughout the active part of the last covered by the upper, the surfaces remain in abutting relation during the movement of the heated portion and there is no danger of pinching the upper or its lining in a gap between the heel piece and the main portion of the last.
  • the guiding of the heel piece in a circular path as shown also assures that there is no over-stretching of the upper while moving the heel piece to or from its position in the full size last.
  • the main part of the last can easily accommodate enough electric heating elements 28 to secure adequate and uniform heating.
  • the heel piece 21 remains in constant abutting relation, even during its movement, adequate heat transfer to the heel piece is assured.
  • a last for the vulcanization of rubber soled footwear comprising a main portion corresponding to the upper and the insole of the footwear and a movable heel portion divided from said main portion along a curved surface, the surface having the same curvature throughout the active part of the last so that the heel portion and the main portion are in abutting relation during movement of said heel portion, and toggle means for forcing said heel portion along said curved surface from a position nearer the toe part of the then fore-shortened last to the heel location of the then full last, said toggle means comprising a link pivotally connected to said main portion of said last, a second link pivotally connected to said first link and to said heel piece, so as to multiply the operators force for the moving of saidgheel piece to its location in the full last.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Description

April 12, 1960 F. FARMER ETAL LASTS FOR RUBBER souan FOOTWEAR Original Filed May 13, 1952 INVENT'oRS HFHKMIR, '9. ZI/YEWY/ by $40 I. HAM
United States Patent 2,932,064 LASTS FOR RUBBER SOLED FOOTWEAR Fred Farmer and Andrew Szerenyi, Waynesville, N.C.,
assignors to Ro-Search, Inc., Waynesville, N.C., a corporation of North Carolina Driginal application May13,
now Patent No. 2,830,324, dated April 15, 1958. Divided and this application March 31, 1958, Serial No. 730,738
1 Claim. (Cl. 1846) I the last. In this position the operator can place the upper on the'last and by pushing the heel portion with his hand, the last is brought to full size and the upper is ready for the vulcanization of the sole. If the sole 1952, Serial No. 287,536,
is made of porous rubber, it is customary to close and lock the mold by hand using a locking device which is part of the mold.
One object of the invention is to improve such lasts so that it becomes possible to move the heel piece without danger of pinching the upper or its lining between the heel piece and the main portion of the last.
Another object of the invention is to improve the last to permit the mounting of uppers of heavy leather or other less flexible material, which hitherto could not be easily mounted and stretched on the heated metal lasts.
Other objects and characteristics of the invention are clarified in connection with the "drawings, which show in Fig. 1 a side view of a last in the extended position according to the invention, while Fig. 2 shows the same last in the foreshortened position. I
The last shown in Fig. 1 consists of a base plate 1 carrying a main portion "6 and a movable heel portion 21 with an extension 22 to which a link 25 is pivotally connected. A further link 24 is pivotally connected to the link 25 and an extension 23 of the base plate 7 so as to present a toggle connection. By actuation of the lever 25, the operators force is multiplied when pulling the movable heel piece 21 into the full size position shown in Fig. 1. The surface separating the heel part 21 from the main part of the heel has the geometric shape of a cylinder surface 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 dividing surface and with it good heat transfer from the heated main part of the heel to the part 21.
As the dividing surface maintains its curvature throughout the active part of the last covered by the upper, the surfaces remain in abutting relation during the movement of the heated portion and there is no danger of pinching the upper or its lining in a gap between the heel piece and the main portion of the last. The guiding of the heel piece in a circular path as shown also assures that there is no over-stretching of the upper while moving the heel piece to or from its position in the full size last.
As can be seen invFig. 1, the main part of the last can easily accommodate enough electric heating elements 28 to secure adequate and uniform heating. As the heel piece 21 remains in constant abutting relation, even during its movement, adequate heat transfer to the heel piece is assured.
This application is a division of the application originally filed May 13, 1952, Serial No. 287,536, now Patent No. 2,830,324.
What we claim is:
A last for the vulcanization of rubber soled footwear comprising a main portion corresponding to the upper and the insole of the footwear and a movable heel portion divided from said main portion along a curved surface, the surface having the same curvature throughout the active part of the last so that the heel portion and the main portion are in abutting relation during movement of said heel portion, and toggle means for forcing said heel portion along said curved surface from a position nearer the toe part of the then fore-shortened last to the heel location of the then full last, said toggle means comprising a link pivotally connected to said main portion of said last, a second link pivotally connected to said first link and to said heel piece, so as to multiply the operators force for the moving of saidgheel piece to its location in the full last.
References Cited in the file of this patent UNITED STATES PATENTS 45,240 Thresher Aug. 2, 1881 1,546,041 Stone July 14, 1925 FOREIGN PATENTS 617,229 Great Britain Feb. 2, 19'49
US730738A 1952-05-13 1958-03-31 Lasts for rubber soled footwear Expired - Lifetime US2932064A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US730738A US2932064A (en) 1952-05-13 1958-03-31 Lasts for rubber soled footwear

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US287536A US2830324A (en) 1952-05-13 1952-05-13 Molds for rubber soled footwear
US730738A US2932064A (en) 1952-05-13 1958-03-31 Lasts for rubber soled footwear

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US2932064A true US2932064A (en) 1960-04-12

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068524A (en) * 1960-03-01 1962-12-18 Herbert Ludwig Shoe last for use in vulcanizing presses
US3203050A (en) * 1963-01-08 1965-08-31 Southern Shoe Machinery Compan Shoe last structure for the manufacture of plastic soles upon shoe uppers
US3314091A (en) * 1965-01-05 1967-04-18 Victor J Levaggi Shoe last construction
US3317940A (en) * 1965-12-08 1967-05-09 Ludwig Herbert Two-part last for the manufacture of footwear
US3705433A (en) * 1970-03-06 1972-12-12 Usm Corp Foot form and shoemaking method
US3803657A (en) * 1972-10-19 1974-04-16 Ro Search Inc Method of removal of finished footwear from lasts and last suitable for said method
US3863284A (en) * 1972-10-19 1975-02-04 Ro Search Inc Last and apparatus for removing footwear therefrom
DE3906303A1 (en) * 1989-02-28 1990-08-30 Helmut Ruehrschneck Method of manufacturing footwear and last for manufacturing footwear
CN106490765A (en) * 2016-12-22 2017-03-15 蜘蛛王集团鞋业有限公司 The upper of a shoe of safety shoe production equipment is arranged die device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US245240A (en) * 1881-08-02 Third to william mcnamara
US1546041A (en) * 1924-08-26 1925-07-14 Henry H Stone Rubber-footwear last
GB617229A (en) * 1944-04-24 1949-02-02 Bata Improvements relating to lasts for pressing and vulcanised rubber footwear

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US245240A (en) * 1881-08-02 Third to william mcnamara
US1546041A (en) * 1924-08-26 1925-07-14 Henry H Stone Rubber-footwear last
GB617229A (en) * 1944-04-24 1949-02-02 Bata Improvements relating to lasts for pressing and vulcanised rubber footwear

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068524A (en) * 1960-03-01 1962-12-18 Herbert Ludwig Shoe last for use in vulcanizing presses
US3203050A (en) * 1963-01-08 1965-08-31 Southern Shoe Machinery Compan Shoe last structure for the manufacture of plastic soles upon shoe uppers
US3314091A (en) * 1965-01-05 1967-04-18 Victor J Levaggi Shoe last construction
US3317940A (en) * 1965-12-08 1967-05-09 Ludwig Herbert Two-part last for the manufacture of footwear
US3705433A (en) * 1970-03-06 1972-12-12 Usm Corp Foot form and shoemaking method
US3803657A (en) * 1972-10-19 1974-04-16 Ro Search Inc Method of removal of finished footwear from lasts and last suitable for said method
US3863284A (en) * 1972-10-19 1975-02-04 Ro Search Inc Last and apparatus for removing footwear therefrom
DE3906303A1 (en) * 1989-02-28 1990-08-30 Helmut Ruehrschneck Method of manufacturing footwear and last for manufacturing footwear
CN106490765A (en) * 2016-12-22 2017-03-15 蜘蛛王集团鞋业有限公司 The upper of a shoe of safety shoe production equipment is arranged die device

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