GB498780A - Improved safety mechanism for clockwork time fuzes for projectiles - Google Patents
Improved safety mechanism for clockwork time fuzes for projectilesInfo
- Publication number
- GB498780A GB498780A GB5576/38A GB557638A GB498780A GB 498780 A GB498780 A GB 498780A GB 5576/38 A GB5576/38 A GB 5576/38A GB 557638 A GB557638 A GB 557638A GB 498780 A GB498780 A GB 498780A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bolt
- trigger
- regulating member
- hammer
- abutment
- 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
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62H—CYCLE STANDS; SUPPORTS OR HOLDERS FOR PARKING OR STORING CYCLES; APPLIANCES PREVENTING OR INDICATING UNAUTHORIZED USE OR THEFT OF CYCLES; LOCKS INTEGRAL WITH CYCLES; DEVICES FOR LEARNING TO RIDE CYCLES
- B62H5/00—Appliances preventing or indicating unauthorised use or theft of cycles; Locks integral with cycles
- B62H5/02—Appliances preventing or indicating unauthorised use or theft of cycles; Locks integral with cycles for locking the steering mechanism
- B62H5/06—Appliances preventing or indicating unauthorised use or theft of cycles; Locks integral with cycles for locking the steering mechanism acting on the front wheel fork or steering head tube
-
- 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
-
- 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
- F42C9/041—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 the clockwork activating a security device, e.g. for unlocking the firing-pin
- F42C9/045—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 the clockwork activating a security device, e.g. for unlocking the firing-pin and the firing-pin being activated by a spring
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Security & Cryptography (AREA)
- Percussive Tools And Related Accessories (AREA)
- Emergency Lowering Means (AREA)
Abstract
498,780. Projectile fuzes. MEFINA SOC. ANON. Feb. 22, 1938, No. 5576. Convention date, May 25, 1937. [Class 9 (i)] Relates to a safety mechanism for clockwork time-fuzes for projectiles adapted to be set over a period of at least a fraction of a revolution, of the kind in which the hammer, tensioned by a spring, is held in the unarmed position by a centrifugal trigger itself held inwards by a time regulating member driven by the clockwork until, at the end of a period corresponding to the previously adjusted setting, the time regulating member releases the trigger which in turn, under centrifugal force, releases the hammer, the fuze also including a centrifugally operated safety bolt. According to the invention, this safety bolt determines the zero position of the time regulating member and is itself locked in this position against accidental release by the time regulating member, the arrangement being such, however, that the safety bolt is positively released by the time regulating member to allow the setting of the fuze, but when the time regulating member is restored to zero it again automatically assumes the interlocked position except when it is subjected to centrifugal force exceeding a certain limit during flight, in which case it is maintained in the released position and thus permits the centrifugal trigger to release the hammer and effect the explosion of the projectile. As shown, the spring-pressed hammer 10 is held in the unarmed position by a centrifugally-operated pivoted trigger 13 which engages in a notch 15 therein. The tip 16 of the trigger bears against the inner face of an annular abutment 17 of a toothed crown 18 which constitutes the time regulating member and is in connection by means of a pinion 19 with the driving shaft 20 of the clockwork. A gap 21 in the abutment 17 is formed with oblique surfaces 22, 23, whilst in the crown 18 a space between two teeth is omitted at a place previously determined by the position of gap 21, so that an abutment 24 is formed whereby the maximum setting is fixed and the gap 21 cannot in any case, during the setting operation, i.e. turning the crown 18 in an anticlockwise direction from the zero position shown in Fig. 2 to the position of maximum setting shown in Fig. 3, come before the tip 16 of trigger 13 and thereby release the hammer. Slidably mounted beneath the trigger 13 is a safety bolt 27 normally drawn inwards by a spring 28. This bolt is formed with a head 29 having an inclined inner surface 30 and a curved outer surface 31 which cooperates with the surface 23 on the abutment 17 in the zero position to prevent a clockwise rotation of the crown 18, whilst the bolt itself is locked against outward movement. On anticlockwise rotation of the crown 18 to set the fuze, the surface 22 on the abutment 17 engages the oblique surface 30 on the head of the bolt 27 and moves the latter outwardly into the Fig. 3 position against the spring 28. Should the fuze be eventually set back to zero, the bolt 27, owing to the action of the spring 28, automatically moves back into its original interlocking position. After discharge of the projectile, however, the bolt 27 is held in its outward position by the action of centrifugal force against the spring 28 and, when the gap 21 in the abutment 17 comes opposite the trigger 13, the latter moves outwardly under centrifugal force and releases the hammer 10. According to a modification, the member 27 may be in the form of an eccentrically mounted swinging bolt.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH498780X | 1937-05-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB498780A true GB498780A (en) | 1939-01-13 |
Family
ID=4516833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5576/38A Expired GB498780A (en) | 1937-05-25 | 1938-02-22 | Improved safety mechanism for clockwork time fuzes for projectiles |
Country Status (6)
Country | Link |
---|---|
US (1) | US2138234A (en) |
BE (1) | BE426510A (en) |
CH (1) | CH197622A (en) |
FR (1) | FR833503A (en) |
GB (1) | GB498780A (en) |
NL (1) | NL47205C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2873678A (en) * | 1955-02-25 | 1959-02-17 | Magnavox Co | Power generating device for projectiles |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748706A (en) * | 1951-10-31 | 1956-06-05 | Arthur P Field | Mechanical fuse for grenades |
US2911915A (en) * | 1954-09-24 | 1959-11-10 | Gibbs Mfg And Res Corp | Time fuse |
CN102735119B (en) * | 2012-06-29 | 2014-10-08 | 北京理工大学 | Electric pin pusher for fuse capable of pushing turntable to rotate |
-
0
- BE BE426510D patent/BE426510A/xx unknown
- NL NL47205D patent/NL47205C/xx active
-
1937
- 1937-05-25 CH CH197622D patent/CH197622A/en unknown
-
1938
- 1938-02-11 FR FR833503D patent/FR833503A/en not_active Expired
- 1938-02-22 GB GB5576/38A patent/GB498780A/en not_active Expired
- 1938-05-10 US US207085A patent/US2138234A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2873678A (en) * | 1955-02-25 | 1959-02-17 | Magnavox Co | Power generating device for projectiles |
Also Published As
Publication number | Publication date |
---|---|
FR833503A (en) | 1938-10-24 |
NL47205C (en) | |
BE426510A (en) | |
CH197622A (en) | 1938-05-15 |
US2138234A (en) | 1938-11-29 |
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