US3747526A - Landmine with pressure trigger - Google Patents

Landmine with pressure trigger Download PDF

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Publication number
US3747526A
US3747526A US00175205A US3747526DA US3747526A US 3747526 A US3747526 A US 3747526A US 00175205 A US00175205 A US 00175205A US 3747526D A US3747526D A US 3747526DA US 3747526 A US3747526 A US 3747526A
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US
United States
Prior art keywords
plunger
flyweight
landmine
firing pin
movement
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
US00175205A
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English (en)
Inventor
J Jany
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.)
BAUFA WERKE RINKER R DT
RINKER BAUFA WERKE
Original Assignee
RINKER BAUFA WERKE
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Publication date
Application filed by RINKER BAUFA WERKE filed Critical RINKER BAUFA WERKE
Application granted granted Critical
Publication of US3747526A publication Critical patent/US3747526A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C7/00—Fuzes actuated by application of a predetermined mechanical force, e.g. tension, torsion, pressure
    • F42C7/02—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person
    • F42C7/04—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person actuated by applying pressure on the ammunition head

Definitions

  • ABSTRACT [30] Foreign Application Priority Data Oct. 9, 1970 Germany P 20 49 656.4 A landmine having a plunger operative, when moved, to release a firing pin to thereby :set off an explosive [52] U.S. Cl. 102/8, 102/70 charge.
  • the firing pin is held by a flyweight that is [51] Int. Cl F42b 23/00 yieldably mounted to the plunger so that when the [58] Field of Search 102/8, 70, 78, 80, plunger is momentarily moved at a relatively rapid 76 speed the inertial resistance to movement of the flyweight will inhibit the rnovemekoi the flyweight, [56] References Cited thereby preventing the release of the firing pin.
  • This invention relates to a landmine with a pressure trigger comprising a pressure plate that is supported by a heightwise displaceable plunger and can be depressed against spring pressure, the plunger in the depressed state releasing a srping biased firing pin.
  • This object is accomplished by providing a flyweight that is mounted for heightwise movement with respect to the plunger.
  • a spring element yieldably urges the flyweight downwardly of the plunger and the firing pin is caused to bear against the flyweight.
  • FIG. 1 is a vertical sectional view of the landmine.
  • FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1.
  • FIG. 3 is a sectional view taken along the line 3-3 of FIG. 1.
  • FIG. 4 is a sectional view taken along the line 4-4 of FIG. 1.
  • FIG. 5 is a view of the landmine to a reduced scale taken along the line 5-5 of FIG. 1.
  • the landmine is designed for a triggering pressure of about 300 kg and comprises-a housing 1 made ofa synthetic material.
  • the housing 1 has a downwardly facing opening that is closed by a bottom 2.
  • a tubular guide 3 is formed in the middle of the housing 1.
  • a plunger 4 is disposed in an opening in the guide 3.
  • the plunger 4, which is also made of 'a synthetic material, is pressed upwardly by a compression spring 5 to a position wherein a collar 6 at the bottom of the plunger abuts a shoulder 7 formed in the lower portion of the guide 3.
  • the lower end of the compression spring 5 bears against a cup-shaped screw 8 that is threaded into the guide 3.
  • the force appplied by the compression spring 5 against the plunger collar 6 can be adjusted by changing the extent to which the screw 8 is threaded into the guide 3.
  • a tubular spacer 9, supported by and located in the interior of the screw 8, is disposed in alignment with the plunger collar 6.
  • a pressure plate 10 is supported to rest on the plunger 4 and is tightly secured to the housing 1 by the fastening member 11 held in place by tensioning bands 12.
  • a plurality of pins 13, such as five, are evenly distributed along the periphery of the pressure plate 10. Each pin 13 extends inwardly of the pressure plate and enters a recess 14 of the housing 1. A screw 15 is threaded into each pin 13, the heads of the screws being supported, via washers, at the interior of the housing 1. A compression spring 16 is disposed in each recess 14 and extends between the housing 1 and the pressure plate 10.
  • An axially displaceable firing pin 17 is disposed trans verse to the plunger 4.
  • the front end portion of the pin 17 has a tip extending into the plunger guide 3 through a bore 18.
  • the firing pin 17 is under spring tension from a compression spring 19.
  • the end of the firing pin remote from the tip is provided with a constricted neck 20 that is in alignment with a blocking latch 21 of a timer 23 that is fastened in a housing chamber 22.
  • the timer 23 is mounted in a ring 24 which is fastened to the housing 1 by two screws 25.
  • the timer 23 is installed in a tensioned state and its spring mechanism (not shown) is released by a. rotation of of a rotatably mounted handle 26.
  • An initial triggering device 27 and a primer charge 28 are disposed in alignment with the firing pin 17.
  • An explosive charge 28' is located adjacent the primer charge 28.
  • the side of the plunger 4 that faces the firing pin 17 has a recess 29 in which a flyweight 30 is mounted for heightwise movement with respect to the plunger in the same direction as the movement of the plunger 4 in guide 3.
  • the flyweight is made of a relatively heavy high density material such as non-rusting steel.
  • the maximum stroke of the flyweight 30 with respect to the guide 3 is the same as that of the plunger 4 in the guide 3, the lower limit of this stroke being determined by the spacer 9 and the upper limit of this stroke being determined by the shoulder 7. This stroke should, preferably, be no more than 2.5 mm.
  • the flyweight 30 is yieldably urged downwardly by a compression spring 31 to a limit stop 32 formed by the top of the collar 6.
  • a bore 33 having a greater cross-sectional area than the largest crosssectional area of the firing pin 17, is located in the. flyweight 30 in alignment with the firing pin.
  • a firing lip 34 formed on the flyweight 30, extends upwardly from the bottom wall of the bore 33 and bears against the front of the firing pin 17.
  • a bore 35 located in the plunger 4, is in alignment with the bore 33.
  • the bore 35 has a cross-sectional area at least equal to that of the bore 33.
  • the end portion of the initial triggering device 27 which faces the firing pin 17 is located within the bore 35.
  • a resilient ring 36 which may be of rubber, is fastened to the housing 1 and extends above the top of the pressure plate 10.
  • the pressure required to compress the ring 36 is less than the pressure required to trigger the landmine.
  • the ring 36 is compressed to such an extent as to cause the pressure plate 10 to force the plunger 4, together with the flyweight 30, downwardly against the force of the spring 5 until the lip 34 releases the firing pin 17.
  • the firing pin is: thus released to be moved by the spring 19 against the initial triggering device 27 to thus detonate the landmine.
  • the amount of this movement of the pressure plate by the plunger 4 is less than 2.5 mm.
  • the handle 26 is first moved from its safe position by about 90 to its armed po sition. This causes a lever 38 and a pin 37 on the timer 23, which were blocked by a pin 38a in the handle 26, to be released so that the biased timer can run down in a preselected time period, e.g., 1 to 2 minutes, and then pivot the blocking latch 21 out of the neck of the firing pin 17 via a gear drive 39. Before this time has expired, the spring tensioned firing pin 17 is thus safely held so that it cannot hit the initial triggering device 27 even when the landmine hits the ground.
  • a preselected time period e.g. 1 to 2 minutes
  • two spring tensioned pins are so located on the ring 24 that in the safe position they releasably engage detents 41 located in the handle 26.
  • the handle 26 is moved from its armed position to its safe position so that the blocking latch 21 is pivoted back into the neck 20 of the firing pin 17 and so that the spring tensioned pins 40 again engage the detents 41.
  • the plunger 4 will be momentarily pushed in relatively rapidly via the pressure plate 10, against the force of the spring 5, after the spring force of the resilient ring 36 has been overcome, but the inertial resistance to movement of the flyweight 30 in the housing 1 will retain the flyweight in position in the housing so that the plunger 4 will move relative to the flyweight 30 and the firing pin 17 will be held safely in its rearward position by the firing lip 34.
  • the elastic ring 36 prevents the plunger 4 from being pressed into the housing 1 by the pressure plate 10 which would happen in the absence of the ring 36, so that the landmine is not detonated.
  • the plunger 4 When a vehicle drives over the top of the landmine, the plunger 4 is forced downwardly againt the force of the spring 5 at a slower rate than when the landmine is dropped. In this case the flyweight 30 is forced downwardly by the spring 31 at the same rate as the plunger 4 to thus lower the firing lip 34 thereby enabling the firing pin to hit the initial triggering device 27 and detonate the landmine.
  • the plunger 4 is circular in crosssection over its entire height except for the recess 29 andthat the flyweight 30 and the recess 29, when taken together with the plunger 4, are circular in crosssection.
  • the opening in the guide 3 that receives the plunger 4 and the flyweight 30 is also circular in crosssection.
  • thetic material by injection-molding without adversely affecting the operation of the triggering mechanism.
  • the flyweight 31 is made of a high density material such as non-rusting steel while the plunger 4 and the guide 3 are preferably made of a synthetic plastic. This enables the flyweight, plunger and guide to be made relatively small to produce an improved explosive effect for the landmine without the flyweight leaving too small a mass. In addition, this enables malfunctions caused by corrosion to be eliminated.
  • flyweight 30 is not prevented by its inertial resistance to movement from moving with the plunger, but is rather displaced by the spring element 31 disposed be-.
  • the landmine will also not be triggered because the spring force' of the plunger spring 5 applies a greater upward force than the downward inertial force that would be applied by the plunger 4 and the flyweight 30.
  • the above-described flyweight safety which was selected to be relatively small to obtain the optimum explosive effect, cannot become effective because with lower dropping heights the inertia of the flyweight 30 is such that it does not move in a direction opposite to the plunger so that the firing pin 17 would be released.
  • the elastically yielding resilient ring 36 prevents the plunger 4-from moving when the landmine falls bottom-down. However, the ring 36 is compressed sufficiently to enable the plunger to move down when it is being driven over so that a perfect triggering of the landmine can occur via the pressure plate 10 and the plunger 4.
  • the landmine includes the timer 23 which blocks the firing pin 17 and which runs down and releases the firing pin after its handle 26 has been rotated by This results in the further advantage that the abovedescribed landmine can now be dropped from a greater height than before although the flyweight safety assures non-triggering of the landmine, if the landmine lands bottomdown, only up to a certain dropping height which depends on the mass relationships between the plunger 4, the flyweight 30 and the mine housing 1 plus the explosive charge 28 and the other components of the triggering mechanism.
  • the stroke of the plunger 4 is limited in the downward direction by the spacer 9 of thermoplastic synthetic material which is disposed below the plunger and which is supported by the abutment in the form of the screw 8 that is disposed in the mine housing 1 and is preferably displaceable, while in the upward direction the plunger movement is limited by the plunger collar 6 bearing against the shoulder 7.
  • a landmine comprising, in combination: a housing; a plunger mounted in the housing for heightwise movement; a pressure plate supported by the plunger; spring means yieldably urging the plunger upwardly to a prescribed position; a flyweight mounted for heightwise movement with respect to the plunger; a spring element, having less force than the spring means, urging the flyweight downwardly with respect to the plunger to a location that is determined by said prescribed position of the plunger; and a spring biased firing pin that bears against the flyweight when the flyweight is in said location and is arranged to be released from the flyweight when the flyweight moves downwardly of said location; whereby when the plunger is forced downwardly of said prescribed position at a relatively slow speed the flyweight will move downwardly with the plunger to release the firing pin and when the plunger is momentarily forced downwardly of said prescribed position at a relatively high speed the inertial resistance to movement of the flyweight will retain the flyweight in said location so that the firing pin will not be released.
  • the landmine as defined in claim 1 further comprising: means mounting the flyweight for heightwise movement in the plunger.
  • the landmine as defined in claim 2 further comprising: a recess in the plunger, in which the flyweight is mounted for said heightwise movement, in that side of the plunger which faces the firing pin; bores in the plunger and the flyweight having greater crosssectional areas than that of the firing pin located in alignment with the firing pin; and a firing lip in the bottom of the flyweight bore that bears against the front of the firing pin when the flyweight is in said location;
  • said spring element is a compression spring disposed in the recess between the flyweight and the plunger.
  • the landmine as defined in claim 2 further comprising: a recess in the plunger in which the flyweight is mounted for said heightwise movement; and an open ing in the housing that receives the plunger for said heightwise movement; and wherein: that portion of the plunger that does not include the recess is circular in cross-section; that portion of the plunger that contains the recess, when taken together with the recess and the flyweight, is circular in cross-section; and said housing opening has a cross-section complementary to the first mentioned cross sections.
  • the landmine as defined in claim 1 further comprising: a spacer, located below the plunger, for determining the limit of downward movement of the plunger; a guide in the housing in which the plunger is mounted for said heightwise movement; a downwardly facing shoulder on the guide; and a. collar in the plunger that abuts the shoulder to determine said prescribed position of the plunger.
  • the landmine as defined in claim 2 further comprising: a recess in the plunger, in which the flyweight is mounted for said heightwise movement; and opening in the housing that receives the plunger for said height wise movement; and wherein the cross-sections of the plunger-flyweight-recess assembly and of the housing opening diminish as they progress upwardly toward the pressure plate.
  • the landmine as defined in claim 1 further comprising: a resilient ring secured to the housing and extending above the top of the pressure plate, whereby if a pressure less than a predetermined amount is applied to the top of the landmine the ring will compress without forcing the plunger downwardly an amount sufficient to release the firing pin.
  • the landmine as defined in claim 1 further comprising: a timer; a handle mounted to the timer for movement between a first position and a second position; and means so connecting the timer to the firing pin as to cause the timer to restrain the firing pin against movement when the handle is in said first position and to cause the timer to release the firing pin for movement a preselected time after the handle has been moved to said second position.
  • the landmine as defined in claim 1 further comprising: a spacer, located below the plunger, for determining the limit of downward movement of the plunger.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US00175205A 1970-10-09 1971-08-26 Landmine with pressure trigger Expired - Lifetime US3747526A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2049656A DE2049656B2 (de) 1970-10-09 1970-10-09 Sicherheitseinrichtung für eine Landmine mit Druckzünder zum Verlegen aus geringer Abwurfhöhe (bis ca. 10m)

Publications (1)

Publication Number Publication Date
US3747526A true US3747526A (en) 1973-07-24

Family

ID=5784647

Family Applications (1)

Application Number Title Priority Date Filing Date
US00175205A Expired - Lifetime US3747526A (en) 1970-10-09 1971-08-26 Landmine with pressure trigger

Country Status (8)

Country Link
US (1) US3747526A (xx)
BE (1) BE761358A (xx)
CH (1) CH532241A (xx)
DE (1) DE2049656B2 (xx)
DK (1) DK128585B (xx)
FR (1) FR2109536A5 (xx)
NL (1) NL139820B (xx)
SE (1) SE359641B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6748869B1 (en) * 1998-12-16 2004-06-15 Delegation Generale Pour L'armement Batiment La Rotonde Device for firing a primer
USH2259H1 (en) * 2008-11-26 2011-07-05 The United States Of America As Represented By The Secretary Of The Navy Yield enhancing device and method of use

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2391447A1 (fr) * 1977-05-18 1978-12-15 Alsetex Mine antichar largable et posable par engin mecanique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682560A (en) * 1925-05-18 1928-08-28 Gruber Hans Explosive mine
US2453715A (en) * 1944-08-28 1948-11-16 Lyle K Liljegren Grenade mine
US3205817A (en) * 1961-04-27 1965-09-14 Madlener Paul Land mine
US3450049A (en) * 1966-09-09 1969-06-17 Us Navy Underwater delay fuze

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682560A (en) * 1925-05-18 1928-08-28 Gruber Hans Explosive mine
US2453715A (en) * 1944-08-28 1948-11-16 Lyle K Liljegren Grenade mine
US3205817A (en) * 1961-04-27 1965-09-14 Madlener Paul Land mine
US3450049A (en) * 1966-09-09 1969-06-17 Us Navy Underwater delay fuze

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6748869B1 (en) * 1998-12-16 2004-06-15 Delegation Generale Pour L'armement Batiment La Rotonde Device for firing a primer
USH2259H1 (en) * 2008-11-26 2011-07-05 The United States Of America As Represented By The Secretary Of The Navy Yield enhancing device and method of use

Also Published As

Publication number Publication date
CH532241A (de) 1972-12-31
BE761358A (fr) 1971-06-16
DK128585B (da) 1974-05-27
SE359641B (xx) 1973-09-03
FR2109536A5 (xx) 1972-05-26
DE2049656A1 (de) 1972-04-13
NL139820B (nl) 1973-09-17
DE2049656B2 (de) 1978-08-03
NL7100353A (xx) 1972-04-11

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