US20110099849A1 - Athletic training shoe inserts and method of fabrication - Google Patents
Athletic training shoe inserts and method of fabrication Download PDFInfo
- Publication number
- US20110099849A1 US20110099849A1 US12/986,231 US98623111A US2011099849A1 US 20110099849 A1 US20110099849 A1 US 20110099849A1 US 98623111 A US98623111 A US 98623111A US 2011099849 A1 US2011099849 A1 US 2011099849A1
- Authority
- US
- United States
- Prior art keywords
- athletic training
- specific gravity
- training shoe
- metallic powder
- thermoplastic elastomer
- 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.)
- Abandoned
Links
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
- B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
- B29D35/122—Soles
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B19/00—Shoe-shaped inserts; Inserts covering the instep
- A43B19/005—Weighted inserts for shoes, i.e. insert comprising an additional weight
Definitions
- This invention relates to personal training weights.
- the present invention relates to training weights for use in athletic training and physical therapy.
- the instant invention concerns the use of shoe inserts as training weights that increase the time weighted energy requirements of the participant.
- the present invention includes a weighted training shoe insert and a method of fabricating a weighted training shoe insert having a higher than 1.0 specific gravity and a low Shore A Durometer. Weighted inserts have been attempted in the past, but have limited use due to fabrication problems and the difficulty of obtaining a proper weight with a desired hardness or Durometer.
- Weighted inserts can be fabricated with a two-component thermoset urethane system with powdered metal added to liquid urethane components to increase the specific gravity of the part.
- the problem with casting inserts in this manner is that the specific gravity of the desired compound is limited, resulting in much less weight than desired for the insert. Due to the low specific gravity, to achieve a sufficient weight for the insert, a cast insert must be thicker than desirable.
- the specific gravity is limited in the casting process because the addition of the powdered metal significantly increases the viscosity of the two-component urethane. Above a certain viscosity, the material can no longer be cast easily.
- the estimated specific gravity of inserts of this type is about 3.0 to 3.5. Increasing the specific gravity to the high end of this range greatly increases the difficulty in the casting process, because of the significant viscosity increase referred to above and this result requires additional, more costly equipment. Thus, it can be seen that achieving the desired higher specific gravity is severely limited by the process.
- Another object of the present invention is to provide new compositions that can be easily manufactured into improved athletic training shoe weighted inserts with a desired specific gravity and a low Shore A Durometer to maximize comfort.
- Another object of the present invention is to provide a new and improved method of manufacturing weighted athletic training inserts or insoles that have a higher than 1.0 specific gravity for athletic training and physical therapy.
- a metallic powder is compounded with a thermoplastic elastomer.
- the thermoplastic elastomer and the metallic powder filler from a variety of available materials and adjusting the amount of each material used, the athletic training shoe weighted insert can be manufactured with a desired softness or durometer and a desired specific gravity.
- a method of manufacturing the athletic training shoe weighted insert with a desired softness or durometer and a desired specific gravity includes the steps of selecting a metallic powder filler with a desired specific gravity, a thermoplastic elastomer, and a plasticizer that will produce the desired softness of the weighted insert.
- the method involves the compounding of the thermoplastic elastomer, the metallic powder and the plasticizer into an athletic shoe insert with a desired quantity or percentage of the metallic powder filler to bring the specific gravity to the desired level and to achieve the desired softness.
- the ratio of thermoplastic elastomer and plasticizer must be changed to achieve a material of the desired durometer.
- the athletic training shoe weighted inserts are formed by a plastic injection molding process.
- the athletic training shoe weighted inserts can alternatively be formed by extruding sheets of the thermoplastic elastomer and metallic powder, and die cutting athletic shoe inserts from the extruded sheets.
- thermoplastic elastomer In a preferred embodiment of the present invention, a metallic powder filled thermoplastic elastomer (TPE) is employed instead of a two component cast urethane liquid system.
- TPE thermoplastic elastomer
- An athletic training shoe weighted insert is fabricated using a TPE compound and a plastic injection molding process to produce the desired product.
- thermoplastic polyurethane can be employed for the weighted inserts.
- thermoplastic TPU chemistry is limited in hardness (on the low side) to about 60 shore A and addition of filler (metallic powder) increases the hardness and stiffness making the insert less desirable.
- other TPE polymers such as styrenic block copolymer (SBC) which can be employed to provide a hardness range matching the current cast system, but they have lower physical properties and poorer aging.
- SBC styrenic block copolymer
- the specific gravity can be greatly increased to as much as 6.0. Higher specific gravities, such as 6.0 to 11.0 can be achieved with the addition of higher specific gravity fillers, such as tungsten, but with a great increase in cost.
- thermoplastic material having a shore A of approximately 0 to 10
- additive of filler material with the desired specific gravity such as copper, iron, etc
- the added filler increases the specific gravity and stiffens and hardens the material to the desired level, typically, but not limited to, the 15 to 45 Shore A range.
- thermoplastic material as much as ninety percent filler material can be employed increasing the specific gravity of the compound to approximately 60% of the specific gravity of the metal powder being employed.
- an athletic training shoe weighted insert of standard size can be produced with substantially increased weight.
- the thermoplastic materials used include SEBS (styrene ethylene butylenes styrene), thermoplastic urethane (TPU) and styrenic block co-polymers (SBC), thermoplastic polyolefins (TPO) and polyether block amides (PEBA).
- the filler materials can be any powder of the desired specific gravity, and include iron, carbonyl iron, water atomized iron, zinc, copper, tungsten, etc. Particle sizes in the range of 5 to 65 microns are desirable.
- Metallic salt fillers may also be used. Conventional plastic fillers such as calcium carbonate, magnesium silicate, calcium silicate and barium sulfate may be used for lower specific gravity compositions. A preferred particle size for these powders is in the 1 to 15 micron range.
- the softness and weight of the final product will be determined by the thermoplastic selected, the amount and type of filler chosen and the amount of plasticizer. In this tri-component system, it is useful to look at the thermoplastic elastomer(e.g. SEBS) and plasticizer combination as one material, typcially referred to as a “polymeric compound”.
- the specific gravity of a resultant combination with metal powder would depend on the weight percentage of the metal powder added or in simpler terms the weight ratio of metal powder to polymeric compound.
- the Shore A hardness (stiffness) of the composition is a function of the weight ratio of the thermoplastic elastomer to the plasticizer.
- the final specific gravity desired which determines the percent of metal powder required and then determine the Shore A hardness value desired, which can be derived from the weight ratio of thermoplastic elastomer to plasticizer. For example, it takes 80% of carbonyl iron to achieve a 3.5 specific gravity compound. That leaves 20% by weight for the polymeric compound. If that is comprised of 50% SEBS (10% of total compound) and 50% oil (plasticizer), then the Shore A hardness will be about 30. By changing the SEBS to 40% (8% of total compound) and the oil 60%, the Shore A will drop to 20.
- Pellets of the desired material can be pre-prepared.
- the pellets include the thermoplastic, with filler and plasticizer.
- the pellets have the desired durometer and specific gravity.
- These pellets of material are then supplied to a conventional injection molding machine having the insert molds. The process of injection molding is well known and will not be described in detail.
- sheets of the material can be extruded, and the inserts die cut from the extruded material.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
An athletic training shoe weighted insert including a metallic powder filled thermoplastic elastomer is formed. A method of manufacturing the athletic training shoe weighted insert with a desired softness or durometer and a desired specific gravity includes the steps of selecting a metallic powder filler, with a desired specific gravity, and a thermoplastic elastomer, and a plasticizer that will produce the desired softness of the weighted insert. The method includes a compounding step of combining the thermoplastic elastomer, metallic powder and plasticizer into a pelletized compound with a desired quantity or percentage of the metallic powder filler to bring the specific gravity to the desired level and to achieve the desired softness. In a preferred embodiment the pelletized compound is then formed into the finished insert by use of the plastic injection molding process.
Description
- This application claims the benefit of U.S. Provisional Application No. 60/758,857, filed 13 Jan. 2006.
- This invention relates to personal training weights.
- More particularly, the present invention relates to training weights for use in athletic training and physical therapy.
- In a further and more specific aspect, the instant invention concerns the use of shoe inserts as training weights that increase the time weighted energy requirements of the participant.
- The present invention includes a weighted training shoe insert and a method of fabricating a weighted training shoe insert having a higher than 1.0 specific gravity and a low Shore A Durometer. Weighted inserts have been attempted in the past, but have limited use due to fabrication problems and the difficulty of obtaining a proper weight with a desired hardness or Durometer.
- Weighted inserts can be fabricated with a two-component thermoset urethane system with powdered metal added to liquid urethane components to increase the specific gravity of the part. The problem with casting inserts in this manner is that the specific gravity of the desired compound is limited, resulting in much less weight than desired for the insert. Due to the low specific gravity, to achieve a sufficient weight for the insert, a cast insert must be thicker than desirable.
- The specific gravity is limited in the casting process because the addition of the powdered metal significantly increases the viscosity of the two-component urethane. Above a certain viscosity, the material can no longer be cast easily. The estimated specific gravity of inserts of this type is about 3.0 to 3.5. Increasing the specific gravity to the high end of this range greatly increases the difficulty in the casting process, because of the significant viscosity increase referred to above and this result requires additional, more costly equipment. Thus, it can be seen that achieving the desired higher specific gravity is severely limited by the process.
- It would be highly advantageous, therefore, to remedy the foregoing and other deficiencies inherent in the prior art.
- It is an object of the present invention to provide new and improved athletic training shoe weighted inserts and a method of fabrication.
- Another object of the present invention is to provide new compositions that can be easily manufactured into improved athletic training shoe weighted inserts with a desired specific gravity and a low Shore A Durometer to maximize comfort.
- Another object of the present invention is to provide a new and improved method of manufacturing weighted athletic training inserts or insoles that have a higher than 1.0 specific gravity for athletic training and physical therapy.
- Briefly, to achieve the desired objects of the instant invention of an athletic training shoe weighted insert a metallic powder is compounded with a thermoplastic elastomer. By selecting the thermoplastic elastomer and the metallic powder filler from a variety of available materials and adjusting the amount of each material used, the athletic training shoe weighted insert can be manufactured with a desired softness or durometer and a desired specific gravity.
- A method of manufacturing the athletic training shoe weighted insert with a desired softness or durometer and a desired specific gravity includes the steps of selecting a metallic powder filler with a desired specific gravity, a thermoplastic elastomer, and a plasticizer that will produce the desired softness of the weighted insert. The method involves the compounding of the thermoplastic elastomer, the metallic powder and the plasticizer into an athletic shoe insert with a desired quantity or percentage of the metallic powder filler to bring the specific gravity to the desired level and to achieve the desired softness. As the specific gravity of the material is raised by adding more filler, the ratio of thermoplastic elastomer and plasticizer must be changed to achieve a material of the desired durometer.
- In a preferred embodiment the athletic training shoe weighted inserts are formed by a plastic injection molding process. The athletic training shoe weighted inserts can alternatively be formed by extruding sheets of the thermoplastic elastomer and metallic powder, and die cutting athletic shoe inserts from the extruded sheets.
- In a preferred embodiment of the present invention, a metallic powder filled thermoplastic elastomer (TPE) is employed instead of a two component cast urethane liquid system. An athletic training shoe weighted insert is fabricated using a TPE compound and a plastic injection molding process to produce the desired product.
- An injection molding grade, high specific gravity polyurethane compound using thermoplastic polyurethane (TPU) can be employed for the weighted inserts. However, thermoplastic TPU chemistry is limited in hardness (on the low side) to about 60 shore A and addition of filler (metallic powder) increases the hardness and stiffness making the insert less desirable. Additionally, there are other TPE polymers such as styrenic block copolymer (SBC) which can be employed to provide a hardness range matching the current cast system, but they have lower physical properties and poorer aging. By employing a TPE, based on SEBS, SEPS or similar elastomers with comparable molecular weights, the specific gravity can be greatly increased to as much as 6.0. Higher specific gravities, such as 6.0 to 11.0 can be achieved with the addition of higher specific gravity fillers, such as tungsten, but with a great increase in cost.
- Thus, in a specific embodiment, a combination of a thermoplastic material and plasticizer having a shore A of approximately 0 to 10 is employed. Addition of filler material with the desired specific gravity, such as copper, iron, etc, can then be added to the material. The added filler increases the specific gravity and stiffens and hardens the material to the desired level, typically, but not limited to, the 15 to 45 Shore A range. With the use of thermoplastic material as much as ninety percent filler material can be employed increasing the specific gravity of the compound to approximately 60% of the specific gravity of the metal powder being employed. Thus, an athletic training shoe weighted insert of standard size can be produced with substantially increased weight.
- The thermoplastic materials used include SEBS (styrene ethylene butylenes styrene), thermoplastic urethane (TPU) and styrenic block co-polymers (SBC), thermoplastic polyolefins (TPO) and polyether block amides (PEBA). The filler materials can be any powder of the desired specific gravity, and include iron, carbonyl iron, water atomized iron, zinc, copper, tungsten, etc. Particle sizes in the range of 5 to 65 microns are desirable. Metallic salt fillers may also be used. Conventional plastic fillers such as calcium carbonate, magnesium silicate, calcium silicate and barium sulfate may be used for lower specific gravity compositions. A preferred particle size for these powders is in the 1 to 15 micron range.
- The softness and weight of the final product will be determined by the thermoplastic selected, the amount and type of filler chosen and the amount of plasticizer. In this tri-component system, it is useful to look at the thermoplastic elastomer(e.g. SEBS) and plasticizer combination as one material, typcially referred to as a “polymeric compound”. The specific gravity of a resultant combination with metal powder would depend on the weight percentage of the metal powder added or in simpler terms the weight ratio of metal powder to polymeric compound. At any given weight percent of metal powder in the composition, the Shore A hardness (stiffness) of the composition is a function of the weight ratio of the thermoplastic elastomer to the plasticizer. In the design of these compounds, one must first choose the final specific gravity desired, which determines the percent of metal powder required and then determine the Shore A hardness value desired, which can be derived from the weight ratio of thermoplastic elastomer to plasticizer. For example, it takes 80% of carbonyl iron to achieve a 3.5 specific gravity compound. That leaves 20% by weight for the polymeric compound. If that is comprised of 50% SEBS (10% of total compound) and 50% oil (plasticizer), then the Shore A hardness will be about 30. By changing the SEBS to 40% (8% of total compound) and the oil 60%, the Shore A will drop to 20.
- The actual fabrication can be quickly and economically accomplished. Pellets of the desired material can be pre-prepared. The pellets include the thermoplastic, with filler and plasticizer. Thus, the pellets have the desired durometer and specific gravity. These pellets of material are then supplied to a conventional injection molding machine having the insert molds. The process of injection molding is well known and will not be described in detail. Alternatively, sheets of the material can be extruded, and the inserts die cut from the extruded material.
- Various changes and modifications to the embodiments herein chosen for purposes of illustration will readily occur to those skilled in the art. To the extent that such modifications and variations do not depart from the spirit of the invention, they are intended to be included within the scope thereof which is assessed only by a fair interpretation of the following claims.
Claims (8)
1. An athletic training shoe weighted insert comprising a metallic powder filled thermoplastic elastomer.
2. An athletic training shoe weighted insert as claimed in claim 1 wherein the thermoplastic elastomer includes a thermoplastic elastomer with plasticizer having a shore A of approximately 0 to 10 Shore A.
3. An athletic training shoe weighted insert as claimed in claim 1 wherein the thermoplastic elastomer includes one of a thermoplastic polyurethane, styrenic block copolymer (SBS), styrene-ethylene-butylene-styrene (SEBS), styrene-ethylene-propylene-styrene (SEPS), and styrene-ethylene-ethylene-styrene (SEEPS).
4. An athletic training shoe weighted insert as claimed in claim 1 wherein the metallic powder includes a powder of a desired specific gravity.
5. An athletic training shoe weighted insert as claimed in claim 4 wherein the metallic powder includes one of iron, carbonyl iron, water atomized iron, zinc, copper, and tungsten.
6. An athletic training shoe weighted insert as claimed in claim 1 including up to ninety percent metallic powder.
7. An athletic training shoe weighted insert as claimed in claim 1 wherein the metallic powder includes particles with a size in a range of 5 to 65 microns.
8-17. (canceled)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/986,231 US20110099849A1 (en) | 2006-01-13 | 2011-01-07 | Athletic training shoe inserts and method of fabrication |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US75885706P | 2006-01-13 | 2006-01-13 | |
US11/653,515 US7868077B1 (en) | 2006-01-13 | 2007-01-16 | Athletic training shoe inserts and method of fabrication |
US12/986,231 US20110099849A1 (en) | 2006-01-13 | 2011-01-07 | Athletic training shoe inserts and method of fabrication |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/653,515 Division US7868077B1 (en) | 2006-01-13 | 2007-01-16 | Athletic training shoe inserts and method of fabrication |
Publications (1)
Publication Number | Publication Date |
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US20110099849A1 true US20110099849A1 (en) | 2011-05-05 |
Family
ID=43415622
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/653,515 Expired - Fee Related US7868077B1 (en) | 2006-01-13 | 2007-01-16 | Athletic training shoe inserts and method of fabrication |
US12/986,231 Abandoned US20110099849A1 (en) | 2006-01-13 | 2011-01-07 | Athletic training shoe inserts and method of fabrication |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/653,515 Expired - Fee Related US7868077B1 (en) | 2006-01-13 | 2007-01-16 | Athletic training shoe inserts and method of fabrication |
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US (2) | US7868077B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140190038A1 (en) * | 2009-03-26 | 2014-07-10 | Ronald James Stratten | Weighted shoe insole and method for making the same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2495277B (en) | 2011-09-29 | 2017-12-13 | Escape Enviro Ltd | Exercise weight structure |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5504156A (en) * | 1993-12-15 | 1996-04-02 | Japan Synthetic Rubber Co., Ltd. | Thermoplastic elastomer composition |
US6005041A (en) * | 1995-11-09 | 1999-12-21 | Cook; Arnold J. | Reinforced thermoplastic elastomeric gel (RTEG) |
US6303666B1 (en) * | 1998-07-30 | 2001-10-16 | Mitsui Chemicals, Inc. | Process for the production of expanded olefinic thermoplastic elastomer products |
US20020050079A1 (en) * | 2000-10-27 | 2002-05-02 | Miyata Yoshiaki | Shoe soles |
US20020193459A1 (en) * | 2000-10-18 | 2002-12-19 | Ryuuji Haseyama | Foam of thermoplastic urethane elastomer composition and process for producing the foam |
US20040000255A1 (en) * | 2002-06-18 | 2004-01-01 | Bbc International Ltd. | Compound for flex sole |
US20040250450A1 (en) * | 2003-06-16 | 2004-12-16 | Molly Snell | Weighted shoe inserts and methods for use |
US20050060910A1 (en) * | 2001-12-26 | 2005-03-24 | Yasushi Kaneda | Shoe insole |
US7073277B2 (en) * | 2003-06-26 | 2006-07-11 | Taylor Made Golf Company, Inc. | Shoe having an inner sole incorporating microspheres |
US20090035543A1 (en) * | 2001-08-27 | 2009-02-05 | Vito Robert A | Vibration dampening material and method of making same |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2100969A (en) * | 1981-06-19 | 1983-01-12 | Yang How | Weighted athletic-training shoe |
US7975404B2 (en) * | 2004-07-01 | 2011-07-12 | Stanbee Company, Inc. | Stiffeners for use in footwear |
-
2007
- 2007-01-16 US US11/653,515 patent/US7868077B1/en not_active Expired - Fee Related
-
2011
- 2011-01-07 US US12/986,231 patent/US20110099849A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5504156A (en) * | 1993-12-15 | 1996-04-02 | Japan Synthetic Rubber Co., Ltd. | Thermoplastic elastomer composition |
US6005041A (en) * | 1995-11-09 | 1999-12-21 | Cook; Arnold J. | Reinforced thermoplastic elastomeric gel (RTEG) |
US6303666B1 (en) * | 1998-07-30 | 2001-10-16 | Mitsui Chemicals, Inc. | Process for the production of expanded olefinic thermoplastic elastomer products |
US20020193459A1 (en) * | 2000-10-18 | 2002-12-19 | Ryuuji Haseyama | Foam of thermoplastic urethane elastomer composition and process for producing the foam |
US20020050079A1 (en) * | 2000-10-27 | 2002-05-02 | Miyata Yoshiaki | Shoe soles |
US20090035543A1 (en) * | 2001-08-27 | 2009-02-05 | Vito Robert A | Vibration dampening material and method of making same |
US20050060910A1 (en) * | 2001-12-26 | 2005-03-24 | Yasushi Kaneda | Shoe insole |
US20040000255A1 (en) * | 2002-06-18 | 2004-01-01 | Bbc International Ltd. | Compound for flex sole |
US20040250450A1 (en) * | 2003-06-16 | 2004-12-16 | Molly Snell | Weighted shoe inserts and methods for use |
US7073277B2 (en) * | 2003-06-26 | 2006-07-11 | Taylor Made Golf Company, Inc. | Shoe having an inner sole incorporating microspheres |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140190038A1 (en) * | 2009-03-26 | 2014-07-10 | Ronald James Stratten | Weighted shoe insole and method for making the same |
US9560895B2 (en) * | 2009-03-26 | 2017-02-07 | Stratten Performance Group, Llc | Weighted shoe insole and method for making the same |
Also Published As
Publication number | Publication date |
---|---|
US7868077B1 (en) | 2011-01-11 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |