GB2079418A - Shot - Google Patents

Shot Download PDF

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Publication number
GB2079418A
GB2079418A GB8022838A GB8022838A GB2079418A GB 2079418 A GB2079418 A GB 2079418A GB 8022838 A GB8022838 A GB 8022838A GB 8022838 A GB8022838 A GB 8022838A GB 2079418 A GB2079418 A GB 2079418A
Authority
GB
United Kingdom
Prior art keywords
shot
coating
molybdenum disulphide
cartridge
shotgun
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.)
Withdrawn
Application number
GB8022838A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8022838A priority Critical patent/GB2079418A/en
Publication of GB2079418A publication Critical patent/GB2079418A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/76—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing
    • F42B12/80—Coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/102—Metallic powder coated with organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/16—Metallic particles coated with a non-metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B7/00—Shotgun ammunition
    • F42B7/02—Cartridges, i.e. cases with propellant charge and missile
    • F42B7/04—Cartridges, i.e. cases with propellant charge and missile of pellet type
    • F42B7/046—Pellets or shot therefor

Abstract

In a shotgun cartridge having lead or iron shot, the shot is coated with molybdenum disulphide which may be bonded to the shot surface by resin. Preferably the molybdenum disulphide is applied from a liquid carrier and the shot is tumbled in the liquid followed by curing which may be at high temperature. Various advantages and benefits such as improved patterns of shot distribution, reduced damage to barrels and low cost production are described.

Description

SPECiFICATION Improvements in shot for shotgun cartridges This invention relates to improvements in shot for shotgun cartridges and has application to lead or iron shot.
According to this invention, in a cartridge for a shotgun, the shot of lead or iron is coated with molybdenum disulphide.
The coating of molybdenum disulphide provides a low friction surface on the shot which obviates the metal surface of the shot contacting the barrel of the shotgun in use. Thus, with lead shot, the deposition of lead in the barrel (known as leading) is avoided; and with iron shot, scoring of the barrel is avoided.
The application of a coating of molybdenum disulphide to the shot provides a simpler and less expensive solution to overcoming the problems, such as of leading and scoring which, at present have to be accommodated in special production techniques such as using graphite coated shot, wax coated drive wads, plastic shot cups, and the use of very soft iron.
The application of a coating of molybdenum disulphide to the shot of a shotgun cartridge provides other advantages in performance of the cartridge such as improving patterns of shot distribution on firing of the cartridge. This arises from reductions in deformation of the shot as pressure is applied and as the shot is constrained by the choke in the shotgun barrel. In addition, molybdenum disulphide coated shot is less likely to ball under the condition when gas leaks past the drive wad.
The coating of molybdenum disulphide may be applied to the lead or iron shot as a dry powder coating, and the coating may be applied by tumbling the shot with powdrous molybdenum disulphide. It is found that the dry powder bonds to the surface of the shot.
The coating of molybdenum disulphide is preferably applied to the shot from a liquid carrier which allows controlled thin coatings to be applied. The liquid carrier may be volatile liquid which comprises resin bonding agents to bond the molybdenum disulphide to the surface of the shot.
The type of resin bonding agent may be varied, and can be a cold curing agent which cures at ambient temperatures on volatilisation of the carrier.
However, improved bonding may be achieved by employing hot curing resins.
The coating of molybdenum disulphide with a resin bonding agent has particular advantages for iron shot as the coating produces a corrosion resistant surface which overcomes certain problems arisng in the use of iron shot.
In use of such liquid carriers for the molybdenum disulphide, the shot may be tumbled in a small quantity of the carrier until the shot is fully coated and subsequently becomes polished to give a smooth surface coated with molybdenum disulphide. With the use of ambient temperature curing resins, the shot may be tumbled until the shot is dry with the carrier having volatised. With high temperature curing resins, the shot may be subjected to heat-curing after coating by tumbling.
It is found that only a very thin coating of molybdenum disulphide is required. Coatings having a thickness from 0.000111 to 0.00038 have been found to be adequate.
Accordingly, the cost of applying the molybdenum disulphide coating is very low, and investment in plant for applying the coating by the preferred method of tumbling is also low, and these low costs more than offset the advantages to be achieved by this invention.
1. In a cartridge for a shotgun, the shot of lead or iron is coated with molybdenum disulphide.
2. In a cartridge for a shotgun according claim 1, the molybdenum disulphide coating is bonded by a resin to the surface of the shot.
3. In a cartridge for a shotgun according to claim 2, the coating is cured at high temperature.
4. In a cartridge for a shotgun according to any one of the preceding claims, the coating of molybdenum disulphide has a thickness within the range of 0.0001" to 0.0003".
5. A cartridge for a shotgun having lead or iron shot coated with molybdenum disulphide substantially as hereinbefore described.
6. A method of making a cartridge for a shot gun wherein the lead or iron shot is coated with molybdenum disulphide prior to filling and assembly of the cartridge.
7. The method according to claim 6 wherein the coating is applied by tumbling the shot in a liquid carrierforthe molybdenum disulphide.
8. The method according to claim 7 wherein the coating comprises a resin bonding agent.
9. The method according to claim 8 wherein the coating is cutted at high temperature.
10. The method of making lead or iron shot for use in a cartridge for a shotgun substantially as hereinbefore described.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECiFICATION Improvements in shot for shotgun cartridges This invention relates to improvements in shot for shotgun cartridges and has application to lead or iron shot. According to this invention, in a cartridge for a shotgun, the shot of lead or iron is coated with molybdenum disulphide. The coating of molybdenum disulphide provides a low friction surface on the shot which obviates the metal surface of the shot contacting the barrel of the shotgun in use. Thus, with lead shot, the deposition of lead in the barrel (known as leading) is avoided; and with iron shot, scoring of the barrel is avoided. The application of a coating of molybdenum disulphide to the shot provides a simpler and less expensive solution to overcoming the problems, such as of leading and scoring which, at present have to be accommodated in special production techniques such as using graphite coated shot, wax coated drive wads, plastic shot cups, and the use of very soft iron. The application of a coating of molybdenum disulphide to the shot of a shotgun cartridge provides other advantages in performance of the cartridge such as improving patterns of shot distribution on firing of the cartridge. This arises from reductions in deformation of the shot as pressure is applied and as the shot is constrained by the choke in the shotgun barrel. In addition, molybdenum disulphide coated shot is less likely to ball under the condition when gas leaks past the drive wad. The coating of molybdenum disulphide may be applied to the lead or iron shot as a dry powder coating, and the coating may be applied by tumbling the shot with powdrous molybdenum disulphide. It is found that the dry powder bonds to the surface of the shot. The coating of molybdenum disulphide is preferably applied to the shot from a liquid carrier which allows controlled thin coatings to be applied. The liquid carrier may be volatile liquid which comprises resin bonding agents to bond the molybdenum disulphide to the surface of the shot. The type of resin bonding agent may be varied, and can be a cold curing agent which cures at ambient temperatures on volatilisation of the carrier. However, improved bonding may be achieved by employing hot curing resins. The coating of molybdenum disulphide with a resin bonding agent has particular advantages for iron shot as the coating produces a corrosion resistant surface which overcomes certain problems arisng in the use of iron shot. In use of such liquid carriers for the molybdenum disulphide, the shot may be tumbled in a small quantity of the carrier until the shot is fully coated and subsequently becomes polished to give a smooth surface coated with molybdenum disulphide. With the use of ambient temperature curing resins, the shot may be tumbled until the shot is dry with the carrier having volatised. With high temperature curing resins, the shot may be subjected to heat-curing after coating by tumbling. It is found that only a very thin coating of molybdenum disulphide is required. Coatings having a thickness from 0.000111 to 0.00038 have been found to be adequate. Accordingly, the cost of applying the molybdenum disulphide coating is very low, and investment in plant for applying the coating by the preferred method of tumbling is also low, and these low costs more than offset the advantages to be achieved by this invention. CLAIMS
1. In a cartridge for a shotgun, the shot of lead or iron is coated with molybdenum disulphide.
2. In a cartridge for a shotgun according claim 1, the molybdenum disulphide coating is bonded by a resin to the surface of the shot.
3. In a cartridge for a shotgun according to claim 2, the coating is cured at high temperature.
4. In a cartridge for a shotgun according to any one of the preceding claims, the coating of molybdenum disulphide has a thickness within the range of 0.0001" to 0.0003".
5. A cartridge for a shotgun having lead or iron shot coated with molybdenum disulphide substantially as hereinbefore described.
6. A method of making a cartridge for a shot gun wherein the lead or iron shot is coated with molybdenum disulphide prior to filling and assembly of the cartridge.
7. The method according to claim 6 wherein the coating is applied by tumbling the shot in a liquid carrierforthe molybdenum disulphide.
8. The method according to claim 7 wherein the coating comprises a resin bonding agent.
9. The method according to claim 8 wherein the coating is cutted at high temperature.
10. The method of making lead or iron shot for use in a cartridge for a shotgun substantially as hereinbefore described.
GB8022838A 1980-07-11 1980-07-11 Shot Withdrawn GB2079418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8022838A GB2079418A (en) 1980-07-11 1980-07-11 Shot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8022838A GB2079418A (en) 1980-07-11 1980-07-11 Shot

Publications (1)

Publication Number Publication Date
GB2079418A true GB2079418A (en) 1982-01-20

Family

ID=10514718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8022838A Withdrawn GB2079418A (en) 1980-07-11 1980-07-11 Shot

Country Status (1)

Country Link
GB (1) GB2079418A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021839A1 (en) * 1995-01-11 1996-07-18 David Bradley Taylor Improvements in or relating to shot
WO1997025587A1 (en) * 1996-01-10 1997-07-17 David Bradley Taylor Environmentally sealed shot
WO1999000468A1 (en) * 1997-06-26 1999-01-07 David Thomas Brown Ballistics conditioning with molybdenum disulfide
US6173652B1 (en) 1996-07-10 2001-01-16 Bradley Taylor Holding Company Limited Environmentally sealed shot
US6576598B2 (en) 2001-08-22 2003-06-10 David Thomas Brown Ballistics conditioning

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021839A1 (en) * 1995-01-11 1996-07-18 David Bradley Taylor Improvements in or relating to shot
WO1997025587A1 (en) * 1996-01-10 1997-07-17 David Bradley Taylor Environmentally sealed shot
US6173652B1 (en) 1996-07-10 2001-01-16 Bradley Taylor Holding Company Limited Environmentally sealed shot
WO1999000468A1 (en) * 1997-06-26 1999-01-07 David Thomas Brown Ballistics conditioning with molybdenum disulfide
US6576598B2 (en) 2001-08-22 2003-06-10 David Thomas Brown Ballistics conditioning

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)