US3454992A - Boot casting - Google Patents

Boot casting Download PDF

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Publication number
US3454992A
US3454992A US568303A US3454992DA US3454992A US 3454992 A US3454992 A US 3454992A US 568303 A US568303 A US 568303A US 3454992D A US3454992D A US 3454992DA US 3454992 A US3454992 A US 3454992A
Authority
US
United States
Prior art keywords
mold
last
support
sole
boot
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
US568303A
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English (en)
Inventor
Kurt Santelmann
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.)
Phoenix AG
Original Assignee
Phoenix Gummiwerke AG
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
Application filed by Phoenix Gummiwerke AG filed Critical Phoenix Gummiwerke AG
Application granted granted Critical
Publication of US3454992A publication Critical patent/US3454992A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B1/00—Footwear characterised by the material
    • A43B1/0027—Footwear characterised by the material made at least partially from a material having special colours

Definitions

  • a collar-like support is firmly connected with the upper end of the last and has a flat fitting surface engaging two outer mold shells which enclose the last and which are movable to a closing position, the iiat fitting surface extends parallel to this closing movement.
  • a sole bottom plate is provided with projections which lock the sole end of the last.
  • This invention relates to boot casting and refers more particularly to the manufacture of -boots by injecting thermoplastic resins and rubber mixes into a mold, starting from the bottom of the boot, the boot mold being divided in the plane of the sole and in a plane perpendicular thereto which extends parallel to the longitudinal axis of the sole.
  • the invention is particularly concerned with a support for boot lasts in a last carrier or in a sole bottom plate.
  • the supporting of boot lasts provides difficulties in the case of the above-described apparatus when the length of the boot, in the -case of thermoplastic resins exceeds about 30 cm.
  • the support furthermore provides diiiiculties when rubber mixes are to #be injected since they require a considerably higher injection pressure than the thermoplastic resins. This pressure can amount to as much as 1200 atmospheres at the nozzle in the case of rubber and up to 250 atmospheres above the atmospheric pressure in the case of plastic.
  • the supporting is effected through a pin which is detachably connected to the mold support.
  • the pin can ordinarily not take up the required lateral pressures since upon slight displacements of the last in the mold, the pressure on the one side is greater than on the other side, thus resulting in a difference in pressure and bending stress on the last or its support.
  • the result is that the Iboot is made with inaccurate wall thicknesses which are out of question for a boot of high quality.
  • the differences in wall thicknesses also occur at places of the boot which are subjected to increased stresses. It should be noted in this connection that the pin, the holder and the last consist of a single piece.
  • An apparatus of this type operates in the manner that upon the opening of the mold the last is held fast on its pin and in this condition a so-called fabric stocking is pulled on.
  • the mold shells which serve to shape the leg of the boot must be adjustable in the direction of the closing forces so that differences in the edges of the mold are compensated for in order to avoid the formation of molding flash. Since the adjustment of the mold shells is effected from the movable mold shell supports or press plates and the last pin is seated in a last support which is fixed in position, it is ditiicult to bring the axis of the closed mold shells parallel to the axis of the last precisely into the same direction as the axis of the last pin.
  • An object of the present invention is the provision of a support of the described type which is so constructed that the disadvantages set forth above are substantially eliminated.
  • the lower end of the last also with a support.
  • This support naturally is effective only in the first stage of manufacture when the leg, together with the leg bottom, is made.
  • the projections on the other hand are removed during the manufacture of the sole in that the sole plate is turned, or is replaced by a sole mold in some other manner.
  • the last is already fixed by the rubber or palstic mass which has penetrated into the space between the last and the mold shell. Accordingly, the support at thelower end of the last can also by itself solve the problem to a certain extent since the ordinary mount at the upper end of the last in combination therewith already assures the necessary security with respect to the precise position of the last in the mold.
  • the guiding of the collar-like support at the upper end of the last is normally plane. This is caused by the plane-parallel closing procedure for the two mold shells. However, it is also possible to have the guiding take place along an arc. This is necessary when the mold shells are opened and closed while carrying out an angular movement. Both the plane-parallel and the angular movement of the shells have their advantages with respect to the precision of lit and the control mechanism.
  • Means are furthermore provided to block the moveability in the guide of the last. This serves to adjust the last in the proper position when the mold is closed before production is started, since when the mold is open it cannot clearly be determined whether the last in view of the movements of the shell mold parts, lies precisely in the center.
  • the guide collar has, parallel to the direction of closing, on the side of the tip of the boot a flat fitting surface. This provides assurance for the vertically parallel adjustment of the last. Finally the collar of the last adapter should extend over the cross section of the leg. In this way a precise axial t of the last in the form shells is possible.
  • FIGURE 1 shows in cross section a mold used for the manufacture of a boot, some parts being shown in side elevation.
  • FIGURE 2. is a cross section through the support of the last.
  • F'IGURE 3 is a cross section of a somewhat diEerently constructed mold.
  • FIGURE 4 is a corresponding cross-section through the last support.
  • FIGURE 5 is an enlarged partial cross section illustrating the heel part of the foot last.
  • FIGURE 6 is a bottom view of the sole bottom plate.
  • the mold construction shown in FIG. 1 is suitable for making boots wherein the leg may be of a different color from the sole.
  • the mold construction of FIG. 3 is suitable to manufacture a boot having a sole of the sarne color. The differences between the two molds reside in the larger sole space and the longer support.
  • FIG. 1 shows a mold carrier 1 connected with a rotary table, upon which several such molds are arranged. Opposite the mold table the insert 2 ⁇ for the inpection device is located. By turning the table the molds are brought one after the other to the injection device.
  • the mold carrier 1 is connected by sleeves 3 and 4 carrying a pin 5 with straps 6, 7, 8 and 9.
  • the sleeves support front and rear mold carrier parts which are separated along a plane parallel to that of the drawing.
  • a last 10 is replaceably fastened on the mold carrier holder 13 which at the same time is the last carrier by the holding pin 11 and the holding core 12.
  • the supporting core 12 is enclosed by a support 14 which is rigidly connected with the last 10 in such manner that it is slidably movable on the supporting core perpendicularly to the plane of the drawing.
  • Projections 15 and :16 serve as the actual holder between the support 14 and the support core 12.
  • the leg mold parts consist of two mold shells 17, one of which lies below the plane of the drawing and the other above it. I'hese mold shells 17 are held by the mold shell carriers 18.
  • the sole mold plate 19 forms the bottom end of the boot. It has an injection bore hole 20 on which at the same time there is 4also seated the injection plate 21.
  • the sole mold plate 19 is held by the carrier of the sole plate 22. The latter is movable separately from the mold shell carriers 18 and is only closed after the mold shells have already been moved against each other. For the loading and removal of the last the latter is separable into two parts, as is customary.
  • a rod 23 is used which extends through the pin 11 into the last and makes possible longitudinal displacement of the last by corresponding elastic joints.
  • an adjustment is possible which is carried out at 24 by means of a set screw (not shown).
  • the screw li'e s in the plane of the drawing and engages through the support 14 the support core 12.
  • For displacement of the set screw an elongated hole is provided in the support 14.
  • a projection 26 serves to align the collar-like support with respect to the mold shells 17.
  • This collar which is formed of the parts 25 and 26 extends around the last and is so seated on the upper edge thereof that it bears against its outer surfaces. In this way, in combination with the other lateral fitting surfaces, there is obtained an absolutely dependable adjustment in three dimensions of the last with respect to the outer mold shells. (see FIG. 4).
  • the sole mold plate 19 has at its upper outer edge a plurality of separate projections 33, 41 which grasp the last at the lower edge during the injection process, during which only a leg with leg bottom is produced, land fixes same in position.
  • An annular hollow space 34 serves to make certain that the supporting core ⁇ 12 rests firmly against the mold carrier holder 13.
  • the last is divided along the Surface 32 lying perpendicularly to the plane of the drawing so as to facilitate the pulling off of the boot from the last 10.
  • FIG. 2 shows additionally the pivot curve 27 which enters into action when the mold shells carry out, as is customary during the opening and closing, angular move ments instead of a plane parallel displacement of different spacing.
  • FIG. 3 illustrates a somewhat similar construction wherein, however, the support 28 is made substantially longer.
  • the sole mold plate 29 for the sole itself is made differently from the sole mold plate 19.
  • the sole mold plate 29 does not have a turning plate but has on the one hand a hollow space for the leg bottom, and on the other hand a hollow space for the sole.
  • the difference in width between the support 28 and the support 14 and the difference in shape of the sole mold plates take into consideration interchangeability of the molds for the manufacture of boots having a sole which is of the same color as, or of a different color from the leg, while retaining the same distance between the axis of rotation of the table and the injection device.
  • the support 28 is broadened since a considerable lever action can occur at the freely suspended last in case of a unilateral introduction of the injected compounds.
  • FIG. 4 which is a cross section corresponding to FIG. 3 shows the flat-fitting surface 25.
  • the collar is there continued in the lateral fitting surfaces 35 and 36 and the angularly set surfaces 30 and 31.
  • the lower edges 37 and 38 are somewhat beveled in order to avoid canting upon the closing of the mold.
  • FIG. 5 shows an enlarged portion of the heel part of the boot last of FIG. 1 and FIG. 6 shows the sole bottom plate seen from below.
  • An edge 40 of the mold shell 17 surrounds the bottom mold plate 19.
  • a projection 41 grips the last 10 from behind and in connection with other extensions 42, 43, 44, 45 such as shown in FIG. 6 makes certain that in the last cannot shift.
  • the rubber or plastic mix is injected to form the leg with leg bottom, and small recesses are produced on the bottom of the leg, which recesses are filled up during the second injection process in the course of which the sole is formed.
  • a mold for casting boots comprising in combination with a last having an Upper end and a sole end, a support firmly connected with the upper end of the last, two outer mold shells enclosing said last and movable to a closing position, means carrying said support and said mold shells, a sole bottom plate and projections carried by said plate and locking the sole end of the last.
  • a mold for casting boots in accordance with claim 5 further comprising means blocking the movement of 3,287,767 said support. 3,302,243 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US568303A 1965-08-19 1966-07-27 Boot casting Expired - Lifetime US3454992A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP0037485 1965-08-19

Publications (1)

Publication Number Publication Date
US3454992A true US3454992A (en) 1969-07-15

Family

ID=7375317

Family Applications (1)

Application Number Title Priority Date Filing Date
US568303A Expired - Lifetime US3454992A (en) 1965-08-19 1966-07-27 Boot casting

Country Status (6)

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US (1) US3454992A (xx)
BE (2) BE684008A (xx)
DE (1) DE1479597C3 (xx)
GB (1) GB1121764A (xx)
NL (1) NL6608154A (xx)
SE (1) SE314802B (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684417A (en) * 1971-03-01 1972-08-15 Antoine Joseph Georges Baudou Mold for ski boots and the like
US3829055A (en) * 1972-07-21 1974-08-13 Gates Rubber Co Mold for locating transverse reinforcements in endless track
US4266750A (en) * 1978-09-21 1981-05-12 Industrie Pirelli S.P.A. Device for manufacturing boots and the like of elastomeric material
CN107263898A (zh) * 2017-06-05 2017-10-20 浙江钜裕机械设备有限公司 卧式雨鞋机
US20210206130A1 (en) * 2016-02-09 2021-07-08 Bauer Hockey Ltd. Skate or other footwear
US11826633B2 (en) 2014-10-22 2023-11-28 Bauer Hockey Llc Hockey skate including a one-piece frame with integral pedestals
US11969056B2 (en) 2016-02-09 2024-04-30 Bauer Hockey Llc Skate or other footwear

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9611763D0 (en) * 1996-06-05 1996-08-07 Foldes Peter Footwear

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL272620A (xx) * 1900-01-01
US741649A (en) * 1902-02-11 1903-10-20 John H Stevenson Curtain-fixture.
FR979571A (xx) * 1951-04-27
US2830324A (en) * 1952-05-13 1958-04-15 Ro Search Inc Molds for rubber soled footwear
GB881641A (en) * 1959-12-21 1961-11-08 Nova Antonio Process and machine for manufacturing rubber boots and shoes
US3128505A (en) * 1960-10-17 1964-04-14 Ludwig Herbert Apparatus for injection molding of plastics articles, especially shoes
US3287767A (en) * 1960-05-23 1966-11-29 Dunlop Rubber Co Injection mould
US3302243A (en) * 1964-04-16 1967-02-07 Herbert P Ludwig Apparatus for the injection molding of plastic articles especially shoes
US3366995A (en) * 1964-04-24 1968-02-06 Philips Corp Apparatus for manufacturing rings or cylinders of ferromagnetic material

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL272620A (xx) * 1900-01-01
FR979571A (xx) * 1951-04-27
US741649A (en) * 1902-02-11 1903-10-20 John H Stevenson Curtain-fixture.
US2830324A (en) * 1952-05-13 1958-04-15 Ro Search Inc Molds for rubber soled footwear
GB881641A (en) * 1959-12-21 1961-11-08 Nova Antonio Process and machine for manufacturing rubber boots and shoes
US3287767A (en) * 1960-05-23 1966-11-29 Dunlop Rubber Co Injection mould
US3128505A (en) * 1960-10-17 1964-04-14 Ludwig Herbert Apparatus for injection molding of plastics articles, especially shoes
US3302243A (en) * 1964-04-16 1967-02-07 Herbert P Ludwig Apparatus for the injection molding of plastic articles especially shoes
US3366995A (en) * 1964-04-24 1968-02-06 Philips Corp Apparatus for manufacturing rings or cylinders of ferromagnetic material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684417A (en) * 1971-03-01 1972-08-15 Antoine Joseph Georges Baudou Mold for ski boots and the like
US3829055A (en) * 1972-07-21 1974-08-13 Gates Rubber Co Mold for locating transverse reinforcements in endless track
US4266750A (en) * 1978-09-21 1981-05-12 Industrie Pirelli S.P.A. Device for manufacturing boots and the like of elastomeric material
US11826633B2 (en) 2014-10-22 2023-11-28 Bauer Hockey Llc Hockey skate including a one-piece frame with integral pedestals
US20210206130A1 (en) * 2016-02-09 2021-07-08 Bauer Hockey Ltd. Skate or other footwear
US11969056B2 (en) 2016-02-09 2024-04-30 Bauer Hockey Llc Skate or other footwear
CN107263898A (zh) * 2017-06-05 2017-10-20 浙江钜裕机械设备有限公司 卧式雨鞋机
CN107263898B (zh) * 2017-06-05 2023-03-10 浙江钜裕机械设备有限公司 卧式雨鞋机

Also Published As

Publication number Publication date
GB1121764A (en) 1968-07-31
DE1479597C3 (de) 1974-08-15
DE1479597A1 (de) 1969-05-14
SE314802B (xx) 1969-09-15
BE684008A (xx) 1966-12-16
BE684006A (xx) 1966-12-16
NL6608154A (xx) 1967-02-20
DE1479597B2 (de) 1974-01-17

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