US2736926A - Method of making a plastic boot or the like - Google Patents

Method of making a plastic boot or the like Download PDF

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Publication number
US2736926A
US2736926A US281814A US28181452A US2736926A US 2736926 A US2736926 A US 2736926A US 281814 A US281814 A US 281814A US 28181452 A US28181452 A US 28181452A US 2736926 A US2736926 A US 2736926A
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United States
Prior art keywords
boot
sole
plastic
mold
making
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Expired - Lifetime
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US281814A
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Jr Clarence E Johnson
Jr Bernhardt M Pederson
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PLASTI IND Inc
PLASTI INDUSTRIES Inc
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PLASTI IND Inc
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Priority to US281814A priority Critical patent/US2736926A/en
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Publication of US2736926A publication Critical patent/US2736926A/en
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    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/14—Dipping a core
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B3/00—Footwear characterised by the shape or the use
    • A43B3/02—Boots covering the lower leg
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B3/00—Footwear characterised by the shape or the use
    • A43B3/16—Overshoes
    • A43B3/163—Overshoes specially adapted for health or hygienic purposes, e.g. comprising electrically conductive material allowing the discharge of electrostatic charges
    • 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
    • B29D35/02—Producing footwear made in one piece using a moulding technique, e.g. by injection moulding or casting
    • B29D35/04—Producing footwear made in one piece using a moulding technique, e.g. by injection moulding or casting having multilayered parts
    • 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 present invention relates to an overshoe or boot made of plastic or rubber-like material for the protection of the shoe, foot, and ankle of the wearer, and to its method of manufacture.
  • the primary object of this invention is to provide a new and improved plastic overshoe or boot with increased wearability and anti-skid properties.
  • Another object is to provide a reinforced heel portion in the sole of the above-mentioned boot to increase the over-all life and wear resistant properties of the boot.
  • This reinforcing is in the form of a fabric pad or mat molded into the sole of the boot during its manufacture so that the pad will lie between the upper and lower surfaces of the boot sole ⁇
  • Another object is to provide a frictional or non-slip bottom on the sole of the boot to substantially increase its anti-slip qualities.
  • the bottom of the sole is made up of a collection of irregular peaks and valleys so as to provide a non-directional surface which possesses increased anti-slip characteristics.
  • Another object is to provide a new and improved method by which this non-directional, anti-slip sole on the boot can easily be made.
  • Figure 1 is a side elevation, partly in sections, of my new boot
  • Figure 2 is a sectional view along line 2 2 of Figure 1 illustrating the upper surface of the boot sole and the reinforcing pad;
  • Figure 3 is a bottom view of Figure 1 illustrating the lower surface of the boot sole with its anti-slip, nondirectional surface;
  • gigure 4 is a sectional View along line 4-4 of Figure 2;
  • Figure 5 is a view of the reinforcing pad that is molded into the sole of the boot heel as shown in Figure 4.
  • the over-all boot is composed primarily of an upper portion 2 for the protection of the ankle of the wearer and a lower portion 3 to receive the foot and shoe of the wearer.
  • the upper portion 2 is provided with an adjustable strap 4 and a buckle 5 for adjusting the strap so that the upper portion of the boot may be manifolded snugly in and around the wearer of the boot.
  • the strap d carries a snap 6 and the buckle 5 carries a snap 7 shown in Figure l, these snaps engaging mating parts on the upper portion 2 of the boot.
  • the snaps on the strap and their mating parts on the upper portion 2 of the boot are appropriately spaced so that the upper portion 2 of the boot may be readily taken in and let out by the use of the strap.
  • the buckle 5 carrying snap 7 is slideable along Strap 4 so that the distance between snaps 6 and 7 on the strap may be readily adjusted to accon.- modate various sizes of ankles.
  • the lower portion 3 of the boot has an over-all rein- V ice forced cross section 8 as this portion will be subjected to a great deal more wear by direct contact with the shoe of the wearer than will the upper portion 2.
  • Lower portion 3 is composed primarily of a heel-enclosing section 9, a toe section 10, and two side walls 11 and 12 joining these two sections on each side of the wearers shoe so as to form an enclosed boot.
  • the sole 13 is provided with a thicker cross section than the upper walls of the boot, see Figure 4, to increase the life and wear resistant qualities of the lower portion of the boot.
  • the lower surface 16 is provided with a non-directional conguration composed of a collection of irregular peaks and valleys so that no set pattern or established plain surface is afforded.
  • a bow l may be used in connection with the adjustable strap 4 for ornamental purposes only, if such a feature is desirable.
  • This boot is best made by a dipping process.
  • a mold of the proper size is rst selected and prepared and then dipped in a dispersion of the plastic in a liquid state.
  • The'mold with a layer of plastic adhering thereto is withdrawn from the liquid solution and allowed to cool until what might be termed a tacky point is reached, then the fabric reinforcement 14 is secured to the heel portion ofthe mold by the application of pressure.
  • the mold with the reinforcing pad adhering thereto is again dipped into the dispersion of liquid plastic but this time the mold is immersed only up to the line 17 in Figure l and withdrawn after a sufficient coating of plastic has formed around the lower portion of the mold.
  • the mold with the boot adhering thereto is allowed to dry until the lower portion again reaches the so-called tacky point whereupon an object with numerous bristles, such as a hair brush, is applied to the sole of the boot.
  • the brush engages the sole so that each bristle becomes lightly covered with plastic on the tip thereof and because the plastic is in a tacky condition, it adheres to the bristles of the brush.
  • the brush is pulled away from the sole, portions of the material adhering to and moving away with the brush and portions remaining with the sole so that a roughened nondirectional surface remains on the sole of the "boot, This procedure is repeated over the entire sole area until a non-directional, roughened surface covers the entire lower surface i6.
  • the boot is allowed to dry suiciently on the mold until it is ready for curing in an oven of approximately 370 Fahrenheit whereupon it is placed in such an oven to be baked for approximately a half an hour so that the complete boot is properly set and hardened and then stripped.
  • the time of baking can obviously be varied according to the characteristics of the plastic-like material selected, and if the material does not require baking, this step may be eliminated.
  • a method of forming a flexible boot of plastic-like material comprising the steps of dipping a boot mold into a liquid solution of plasticdike material to form a coating of material thereon, removing the mold and allowing the coating to dry until it becomes slightly tacky, applying the bristles of a brush-like object to the sole of the coating so that material will adhere to the bristles, and drawing the object away from the coating with portions of the plastic material adhering thereto so that a non-directional anti-slip surface of irregular peaks and valleys will be formed on the sole area.
  • the method of claim 1 characterized by and including the step of subjecting the plastic coating to an elevated temperature for a predetermined period of time to harden it.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Description

March 6, 1956 c. E. JOHNSON, JR., l-:TAL 2,736,926
METHOD OF MAKING A PLASTIC BOOT OR THE LIKE Filed Aprill 11, 1952 United States- Patent() NIETHOD F MAKING A PLASTIC BOOT 0R THE LIKE Clarence E. Johnson, Jr., and Bernhardt M. Pederson, Jr., Winona, Minn., assignors to Plasti Industries, Inc., Winona, Minn., a corporation of Minnesota Application April 11, 1952, Serial No. 281,814
2 Claims. (Cl. 18-58.7)
The present invention relates to an overshoe or boot made of plastic or rubber-like material for the protection of the shoe, foot, and ankle of the wearer, and to its method of manufacture.
The primary object of this invention is to provide a new and improved plastic overshoe or boot with increased wearability and anti-skid properties.
Another object is to provide a reinforced heel portion in the sole of the above-mentioned boot to increase the over-all life and wear resistant properties of the boot. This reinforcing is in the form of a fabric pad or mat molded into the sole of the boot during its manufacture so that the pad will lie between the upper and lower surfaces of the boot sole` Another object is to provide a frictional or non-slip bottom on the sole of the boot to substantially increase its anti-slip qualities. The bottom of the sole is made up of a collection of irregular peaks and valleys so as to provide a non-directional surface which possesses increased anti-slip characteristics.
Another object is to provide a new and improved method by which this non-directional, anti-slip sole on the boot can easily be made.
Other objects will, from time to time, appear in the specifications and drawings wherein:
Figure 1 is a side elevation, partly in sections, of my new boot;
Figure 2 is a sectional view along line 2 2 of Figure 1 illustrating the upper surface of the boot sole and the reinforcing pad;
Figure 3 is a bottom view of Figure 1 illustrating the lower surface of the boot sole with its anti-slip, nondirectional surface;
gigure 4 is a sectional View along line 4-4 of Figure 2; an
Figure 5 is a view of the reinforcing pad that is molded into the sole of the boot heel as shown in Figure 4.
Like parts are indicated by like symbols throughout the specifications and drawings.
The over-all boot is composed primarily of an upper portion 2 for the protection of the ankle of the wearer and a lower portion 3 to receive the foot and shoe of the wearer. The upper portion 2 is provided with an adjustable strap 4 and a buckle 5 for adjusting the strap so that the upper portion of the boot may be manifolded snugly in and around the wearer of the boot. The strap d carries a snap 6 and the buckle 5 carries a snap 7 shown in Figure l, these snaps engaging mating parts on the upper portion 2 of the boot. The snaps on the strap and their mating parts on the upper portion 2 of the boot are appropriately spaced so that the upper portion 2 of the boot may be readily taken in and let out by the use of the strap. The buckle 5 carrying snap 7 is slideable along Strap 4 so that the distance between snaps 6 and 7 on the strap may be readily adjusted to accon.- modate various sizes of ankles.
The lower portion 3 of the boot has an over-all rein- V ice forced cross section 8 as this portion will be subjected to a great deal more wear by direct contact with the shoe of the wearer than will the upper portion 2. Lower portion 3 is composed primarily of a heel-enclosing section 9, a toe section 10, and two side walls 11 and 12 joining these two sections on each side of the wearers shoe so as to form an enclosed boot. The sole 13 is provided with a thicker cross section than the upper walls of the boot, see Figure 4, to increase the life and wear resistant qualities of the lower portion of the boot.
This type of overshoe is primarily designed for use by women, and the sharp heels of the wearer have proved extremely detrimental to the heel portion of the boot. To resist these sharp heels a reinforced pad or mat 14 is molded into the heel portion of the boots sole 13 during its manufacture as described hereinbelow so that the pad 14 will lie between the upper and lov er surfaces 15 and 16 of the sole 13 so as to be embedded therein.
The lower surface 16 is provided with a non-directional conguration composed of a collection of irregular peaks and valleys so that no set pattern or established plain surface is afforded.
A bow l may be used in connection with the adjustable strap 4 for ornamental purposes only, if such a feature is desirable.
This boot is best made by a dipping process. A mold of the proper size is rst selected and prepared and then dipped in a dispersion of the plastic in a liquid state. The'mold with a layer of plastic adhering thereto is withdrawn from the liquid solution and allowed to cool until what might be termed a tacky point is reached, then the fabric reinforcement 14 is secured to the heel portion ofthe mold by the application of pressure. The mold with the reinforcing pad adhering thereto is again dipped into the dispersion of liquid plastic but this time the mold is immersed only up to the line 17 in Figure l and withdrawn after a sufficient coating of plastic has formed around the lower portion of the mold. The mold with the boot adhering thereto is allowed to dry until the lower portion again reaches the so-called tacky point whereupon an object with numerous bristles, such as a hair brush, is applied to the sole of the boot. The brush engages the sole so that each bristle becomes lightly covered with plastic on the tip thereof and because the plastic is in a tacky condition, it adheres to the bristles of the brush. Then the brush is pulled away from the sole, portions of the material adhering to and moving away with the brush and portions remaining with the sole so that a roughened nondirectional surface remains on the sole of the "boot, This procedure is repeated over the entire sole area until a non-directional, roughened surface covers the entire lower surface i6.
The boot is allowed to dry suiciently on the mold until it is ready for curing in an oven of approximately 370 Fahrenheit whereupon it is placed in such an oven to be baked for approximately a half an hour so that the complete boot is properly set and hardened and then stripped. The time of baking can obviously be varied according to the characteristics of the plastic-like material selected, and if the material does not require baking, this step may be eliminated.
hile i have illustrated and described a preferred form of my plastic boot, l do not wish to be understood to confine myself specifically thereto except as limited by the appended claims.
I claim:
l. A method of forming a flexible boot of plastic-like material comprising the steps of dipping a boot mold into a liquid solution of plasticdike material to form a coating of material thereon, removing the mold and allowing the coating to dry until it becomes slightly tacky, applying the bristles of a brush-like object to the sole of the coating so that material will adhere to the bristles, and drawing the object away from the coating with portions of the plastic material adhering thereto so that a non-directional anti-slip surface of irregular peaks and valleys will be formed on the sole area.
2. The method of claim 1 characterized by and including the step of subjecting the plastic coating to an elevated temperature for a predetermined period of time to harden it.
References Cited in the ile of this patent UNITED STATES PATENTS Clark June 29, Grosky July 28, Miller Nov. 10, Murphy May 9, McCandlish Jan. 26, Demick Dec. 26,
FOREIGN PATENTS Great Britain Feb. 5,
Great Britain Mar. 25,
US281814A 1952-04-11 1952-04-11 Method of making a plastic boot or the like Expired - Lifetime US2736926A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2997746A (en) * 1955-08-01 1961-08-29 Seamless Rubber Co Method of making roughened rubber product
US3099885A (en) * 1963-04-09 1963-08-06 Joseph J Jordan Anti-slip device for boots
US3765810A (en) * 1971-12-29 1973-10-16 Union Carbide Corp Molding device
US20040020080A1 (en) * 2002-07-31 2004-02-05 Anthony Cox Shoe bottom having interspersed materials
US20040194345A1 (en) * 2003-04-03 2004-10-07 Koo John C. S. Particulate-bottomed outdoor shoe
US20100242305A1 (en) * 2009-03-30 2010-09-30 Warren Liu Therapeutic cushioned sole
WO2013024378A1 (en) * 2011-08-15 2013-02-21 Kimberly-Clark Worldwide, Inc. Disposable protective footwear cover
US9078492B2 (en) 2003-04-03 2015-07-14 Dynasty Footwear, Ltd. Shoe having a contoured bottom with small particles bonded to the lowest extending portions thereof
US9414643B2 (en) 2002-07-31 2016-08-16 Dynasty Footwear, Ltd. Shoe having individual particles embedded within its bottom surface
USD785912S1 (en) 2011-08-15 2017-05-09 Kimberly-Clark Worldwide, Inc. Disposable protective footwear cover
US10143267B1 (en) 2013-12-31 2018-12-04 Dynasty Footwear, Ltd. Shoe bottom surface having attached particles
USD919104S1 (en) * 2014-07-31 2021-05-11 Brenda S. Woolf Protective foot cover
US11284676B2 (en) 2012-06-13 2022-03-29 John C. S. Koo Shoe having a partially coated upper

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US926387A (en) * 1905-10-28 1909-06-29 Marvel Rubber Company Article of vulcanized footwear.
US1105270A (en) * 1914-07-28 Louis J Grosky Rubber footwear.
GB191501889A (en) * 1914-12-11 1915-05-06 Hutchinson Sa Des Ets Improvements in or relating to Over-boots.
GB140302A (en) * 1919-07-25 1920-03-25 John James Hartopp Improvements in or relating to athletic boots and shoes
US1560941A (en) * 1925-07-13 1925-11-10 United Metal Products Company Ornamented surface and method of forming the same
US1907856A (en) * 1929-10-05 1933-05-09 Dunlop Rubber Co Rubber footwear
US2309520A (en) * 1941-01-24 1943-01-26 Mccandlish Edward Overshoe
US2535123A (en) * 1946-11-23 1950-12-26 Goodrich Co B F Overshoe with shank filler piece therein

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1105270A (en) * 1914-07-28 Louis J Grosky Rubber footwear.
US926387A (en) * 1905-10-28 1909-06-29 Marvel Rubber Company Article of vulcanized footwear.
GB191501889A (en) * 1914-12-11 1915-05-06 Hutchinson Sa Des Ets Improvements in or relating to Over-boots.
GB140302A (en) * 1919-07-25 1920-03-25 John James Hartopp Improvements in or relating to athletic boots and shoes
US1560941A (en) * 1925-07-13 1925-11-10 United Metal Products Company Ornamented surface and method of forming the same
US1907856A (en) * 1929-10-05 1933-05-09 Dunlop Rubber Co Rubber footwear
US2309520A (en) * 1941-01-24 1943-01-26 Mccandlish Edward Overshoe
US2535123A (en) * 1946-11-23 1950-12-26 Goodrich Co B F Overshoe with shank filler piece therein

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2997746A (en) * 1955-08-01 1961-08-29 Seamless Rubber Co Method of making roughened rubber product
US3099885A (en) * 1963-04-09 1963-08-06 Joseph J Jordan Anti-slip device for boots
US3765810A (en) * 1971-12-29 1973-10-16 Union Carbide Corp Molding device
US20040020080A1 (en) * 2002-07-31 2004-02-05 Anthony Cox Shoe bottom having interspersed materials
US10306945B2 (en) 2002-07-31 2019-06-04 Dynasty Footwear, Ltd. Shoe having individual particles bonded to its bottom surface
US9894955B2 (en) 2002-07-31 2018-02-20 Dynasty Footwear, Ltd. Shoe having individual particles bonded to its bottom surface
US7203985B2 (en) 2002-07-31 2007-04-17 Seychelles Imports, Llc Shoe bottom having interspersed materials
US9414643B2 (en) 2002-07-31 2016-08-16 Dynasty Footwear, Ltd. Shoe having individual particles embedded within its bottom surface
US8808487B1 (en) 2003-04-03 2014-08-19 Dynasty Footwear, Ltd. Shoe bottom surface made of sheet material with particles bonded to it prior to shaping
US8647460B1 (en) 2003-04-03 2014-02-11 Dynasty Footwear, Ltd. Shoe having a bottom with bonded and then molded-in particles
US9078492B2 (en) 2003-04-03 2015-07-14 Dynasty Footwear, Ltd. Shoe having a contoured bottom with small particles bonded to the lowest extending portions thereof
US7191549B2 (en) 2003-04-03 2007-03-20 Dynasty Footwear, Ltd. Shoe having an outsole with bonded fibers
US20040194345A1 (en) * 2003-04-03 2004-10-07 Koo John C. S. Particulate-bottomed outdoor shoe
US20100242305A1 (en) * 2009-03-30 2010-09-30 Warren Liu Therapeutic cushioned sole
WO2013024378A1 (en) * 2011-08-15 2013-02-21 Kimberly-Clark Worldwide, Inc. Disposable protective footwear cover
USD785912S1 (en) 2011-08-15 2017-05-09 Kimberly-Clark Worldwide, Inc. Disposable protective footwear cover
US11284676B2 (en) 2012-06-13 2022-03-29 John C. S. Koo Shoe having a partially coated upper
US10143267B1 (en) 2013-12-31 2018-12-04 Dynasty Footwear, Ltd. Shoe bottom surface having attached particles
US11234487B2 (en) 2013-12-31 2022-02-01 Dynasty Footwear, Ltd. Shoe bottom surface having attached particles
US11882896B2 (en) 2013-12-31 2024-01-30 Dynasty Footwear, Ltd. Shoe bottom surface having attached particles
USD919104S1 (en) * 2014-07-31 2021-05-11 Brenda S. Woolf Protective foot cover

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