US2741185A - Locking mechanism for a clockwork movement of a mechanical time fuse for a projectile - Google Patents

Locking mechanism for a clockwork movement of a mechanical time fuse for a projectile Download PDF

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Publication number
US2741185A
US2741185A US222344A US22234451A US2741185A US 2741185 A US2741185 A US 2741185A US 222344 A US222344 A US 222344A US 22234451 A US22234451 A US 22234451A US 2741185 A US2741185 A US 2741185A
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United States
Prior art keywords
locking
levers
movement
projectile
lever
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Expired - Lifetime
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US222344A
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English (en)
Inventor
Hoenger Guido
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Mefina SA
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Mefina SA
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Publication date
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Publication of US2741185A publication Critical patent/US2741185A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/20—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin
    • F42C15/22—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin using centrifugal force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
    • F42C9/02—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means
    • F42C9/04—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means by spring motor
    • F42C9/048—Unlocking of clockwork mechanisms, e.g. by inertia or centrifugal forces; Means for disconnecting the clockwork mechanism from the setting mechanism

Definitions

  • This invention relates in general to projectile time fuses of the clockwork actuated type, and more particularly has reference to a safety mechanism for locking the clockwork against movement and releasable under the action of centrifugal force produced by rotation of the projectile in flight.
  • the principal object of the present invention is to provide mechanism for locking the clockwork movement in mechanical time fuses which will avoid the above pointed out disadvantage of the prior devices.
  • Another object of this invention is to provide a mechanism comprising at least two centrifugal clockwork movement locking members arranged symmetrically on either side of the axis of the fuse and cooperating one with the other, said members remaining constantly in mutual engagement, and each pivoting eccentrically and being subjected to the action of a spring tending to maintain the member in locking position, neither of said members being capable of moving out of its locking position, unless the other also does so.
  • Figure 1 is an elevation of the time fuse mechanism with locking device
  • Figure 2 is a sectional view taken on line 2--2 of Fig. 1.
  • the time fuse actuating clockwork locking mechanism comprises two centrifugally released locking levers 1 and 1a of general semi-annular shape, said levers being pivoted eccentrically at 2 and 2a respectively, near their ends, and carrying stop pins 3, 3a each located remotely from the pivoting axis 2, 2a.
  • the levers 1 and 1a are mounted on the upper frame plate 11 of the clockworkmovement and the pins 3, 3a traverse this plate through openings 12 and 12a of arcuate shape, the center of curvature of which coincides with the pivots 2, 2a.
  • the pins 3, 3a engage notches 8, 8a of the balance wheel 7 of the clockwork, which is locked in position of rest when the locking levers 1 and 1a are urged towards the axis of the fuse by two restoring springs 6, 6a respectively.
  • the locking levers 1 and 1a each has a front nose 4, 4a provided on the ends of their long arms, and a rear nose 5, 5a provided on the ends of their short arms.
  • the rear nose of one lever cooperates with the front nose of the other lever to maintain it in locking position.
  • the noses 5, 5a lie in contact with the noses 4a and 4 by the action of the springs 6 and 6a, in such a man- 2,741,185 Patented Apr. 10, 1956 'ice ner that neither of the levers can move out of its locking position unless the other lever is moved out of its lockmg position.
  • the locking lever 1a urged by the force 13a will tend to move still further towards the center.
  • the total force which will hold it against the center will be the sum of the force 13a and of the force of the restoring spring 6a.
  • the locking lever 1 urged by the force 13 will tend to move outwardly to unlocking position.
  • the total force urging it to move away from the center will be the difierence between the force 13 and the force of the restoring spring 6.
  • the locking lever 1a will be subjected to the total force greater than that acting on the locking lever 1.
  • the locking levers 1, 1a will then open and the stop pins 3, 3a will abut against the ends of the openings 12, 12a of the frame plate 11, thus releasing the balance wheel 7 which is no longer arrested.
  • the stop pins then occupy the positions 3, 3".
  • the noses of the locking levers 1 and 1a will then occupy the positions shown in broken lines.
  • the locking mechanism described thus can operate only under centrifugal force. It is perfectly insensitive to shocks of any other nature, either feeble or violent, such as might result from vibration, falls, or any other causes.
  • One locking lever cannot open unless the other also does so.
  • One stop pin can never lie in locking position while the other stop pin is in release position.
  • the twin locking levers are always simultaneously closed or simultaneously open.
  • the mechanism may comprise more than two centrifugally released locking levers cooperating one with the other, and that instead of acting against the balance wheel of the clockwork movement, the locking members may act upon any other part of this movement capable of preventing premature starting of the clockwork.
  • a locking mechanism for a clockwork movement of a mechanical time fuse for a projectile adapted to rotate about its axis during flight comprising at least two clockwork locking levers of general semi-annular form symmetrically and concentrically disposed on opposite sides of said axis, means symmetrically disposed on opposite sides of said axis for pivotally mounting said levers adjacent one of their ends for pivotal movement about axes parallel to said projectile axis, and proiding each lever with a long arm movable outwardly rider the action of centrifugal force upon rotation of he projectile about its axis, said levers being of a length nch that the long arm of each underlies the short arm If the other lever for preventing inward movement of he short arm and outward unlocking movement of the ong arm of each lever while the long arm of, the other ever is in its inner locking position, and spring means :ooperating with each lever to urge the long arm of each ever to its inner locking position; each end of the locking evers being tapered or nose-
  • a locking mechanism for a clockwork movement of a mechanical time fuse for a projectile adapted to rotate about its axis during flight comprising a frame plate of the clockwork movement extending transversely of said axis, at least two clockwork locking levers of general semi-annular form symmetrically and concentrically disposed on opposite sides of said axis, means carried by said plate and symmetrically disposed on opposite sides of said axis for pivotally mounting said levers eccentrically with respect to their centers of gravity for pivotal movement about axes parallel to said projectile axis outwardly under the action of centrifugal force upon rotation of the projectile about its axis, spring means urging said levers inwardly into locking position, and cooperating interlocking parts on the ends of said levers for preventing outward movement of either lever from locking position unless there is a corresponding outward movement of the other lever from locking position, said plate having openings therein and a pin carried by one end of each lever and extending through an opening in the plate to engage a part
  • a locking mechanism for a clockwork movement of a mechanical time fuse for a projectile adapted to rotate about its axis during flight comprising a frame plate of the clockwork movement extending transversely of said axis, at least two clockwork locking levers of general semi-annular form symmetrically and concentrically disposed on opposite sides of said axis, means carried by said piate and symmetrically disposed on opposite sides of said axis for pivotally mounting said levers eccentrically with respect to their centers of gravity for pivotal movement about axes parallel to said projectile axis outwardly under the'action of centrifugal force upon rotation of the projectile about its axis, spring means urging said levers inwardly into locking position, and cooperating interlocking parts on the ends of said levers for preventing outward movement of either lever from locking position unless there is a corresponding outward movement of the other lever from locking position, said plate having two arcuate openings therein, the centers of curvature of which coincide with said pivotal mounting means and a

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Mechanical Control Devices (AREA)
  • Emergency Lowering Means (AREA)
US222344A 1950-07-10 1951-04-23 Locking mechanism for a clockwork movement of a mechanical time fuse for a projectile Expired - Lifetime US2741185A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH688883X 1950-07-10

Publications (1)

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US2741185A true US2741185A (en) 1956-04-10

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US222344A Expired - Lifetime US2741185A (en) 1950-07-10 1951-04-23 Locking mechanism for a clockwork movement of a mechanical time fuse for a projectile

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US (1) US2741185A (US07235543-20070626-C00056.png)
BE (1) BE504037A (US07235543-20070626-C00056.png)
CH (1) CH284825A (US07235543-20070626-C00056.png)
DE (1) DE903787C (US07235543-20070626-C00056.png)
FR (1) FR1038487A (US07235543-20070626-C00056.png)
GB (1) GB688883A (US07235543-20070626-C00056.png)
NL (2) NL76931C (US07235543-20070626-C00056.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989867A (en) * 1955-10-10 1961-06-27 Rockwell Mfg Co Water meter with frangible cover

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US988610A (en) * 1909-07-28 1911-04-04 Krupp Ag Impact-fuse.
US2097836A (en) * 1935-07-27 1937-11-02 Junghans Helmut Mechanical time fuse having a centrifugal drive
US2130720A (en) * 1935-01-18 1938-09-20 Junghans Helmut Centrifugal fuse
GB598266A (en) * 1945-07-13 1948-02-13 Paul Schweizer Improvements in clockwork fuzes for ammunition projectiles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH27817A (de) * 1902-11-17 1904-02-29 Carl Baeker Zeitzünder für Artilleriegeschosse
NL63416C (US07235543-20070626-C00056.png) * 1941-02-27

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US988610A (en) * 1909-07-28 1911-04-04 Krupp Ag Impact-fuse.
US2130720A (en) * 1935-01-18 1938-09-20 Junghans Helmut Centrifugal fuse
US2097836A (en) * 1935-07-27 1937-11-02 Junghans Helmut Mechanical time fuse having a centrifugal drive
GB598266A (en) * 1945-07-13 1948-02-13 Paul Schweizer Improvements in clockwork fuzes for ammunition projectiles

Also Published As

Publication number Publication date
FR1038487A (fr) 1953-09-29
GB688883A (en) 1953-03-18
BE504037A (US07235543-20070626-C00056.png)
NL76931C (US07235543-20070626-C00056.png)
NL156252B (nl)
DE903787C (de) 1954-02-11
CH284825A (fr) 1952-08-15

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