U.S. patent number 3,595,126 [Application Number 04/849,993] was granted by the patent office on 1971-07-27 for fuze initiator.
This patent grant is currently assigned to Avco Corporation. Invention is credited to David C. Norton.
United States Patent |
3,595,126 |
Norton |
July 27, 1971 |
FUZE INITIATOR
Abstract
A fuze initiator is disclosed for initiating a fuze based upon
the principle that an initiating force can be transmitted to a
gripping element which will respond to the force similarly to a
human hand reaction. The initiator includes biased open individual
gripping members mounted for slidable movement in a divergent bore
portion of a housing. The gripping members close about a fuze
engagement shaft in response to movement of the gripping members
from the divergent portion to a straight bore portion.
Inventors: |
Norton; David C. (Fort Walton
Beach, FL) |
Assignee: |
Avco Corporation (Richmond,
IN)
|
Family
ID: |
25307009 |
Appl.
No.: |
04/849,993 |
Filed: |
August 14, 1969 |
Current U.S.
Class: |
89/1.55; 403/290;
102/258 |
Current CPC
Class: |
F42C
19/12 (20130101); B64D 1/04 (20130101); Y10T
403/535 (20150115) |
Current International
Class: |
B64D
1/00 (20060101); B64D 1/04 (20060101); F42C
19/00 (20060101); F42C 19/12 (20060101); F41f
005/02 (); B64d 001/04 () |
Field of
Search: |
;89/1.5,1.5D,1.5G
;102/22,21.2,76,70 ;287/103 ;294/83,90 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Engle; Samuel W.
Claims
What is claimed is:
1. A fuze initiator assembly for projectiles, missiles, bombs and
the like comprising:
a housing having a bore therethrough, said housing having one end
formed to provide a divergent bore portion;
a collet for engaging a fuze engagement shaft, said collet being
mounted in the divergent bore portion of said housing for slidable
movement along the bore;
an adapter shaft attachable to said collet and extending through
the bore and outwardly of the other end of the housing; and
means attached to said adapter shaft wherein when the projectile is
launched the force is transferred from said means through the
adapter shaft to the collet whereby a fuze engagement shaft is
pulled allowing the arming sequence to begin.
2. An initiator as set forth in claim 1 in which said collet
comprises a body portion slidable in said bore and gripping members
extending outward into the divergent bore portion, said gripping
members being biased outwardly to conform to the divergent bore
portion to provide for insertion of a fuze engagement shaft
therein; and
means for urging said collet axially in said bore so that the
gripping members are in the divergent bore portion.
3. An initiator as set forth in claim 2 further comprising a detent
element at the outer end of each gripping member to engage a lip of
the engagement shaft upon insertion of the engagement shaft into
the divergent bore portion; and
in which the means for urging said collet comprises a compression
spring mounted and acting against one end of said collet.
4. A fuze initiator assembly for engaging a fuze engagement shaft
for projectiles, missiles, bombs and the like comprising:
a housing having a bore therethrough, said housing formed at one
end to provide a divergent bore portion at one end of the bore;
a collet mounted for slidable movement in the bore adjacent the
divergent portion end for engaging a fuze engagement shaft;
an adapter shaft attachable to said collet and extending through
said bore and beyond the other end of the housing;
means urging said collet to a first position for receiving the fuze
engagement shaft;
said collet being moved to a second position upon insertion of the
fuze engagement shaft into the initiator assembly wherein upon
release of the projectile the resulting force is transmitted
through the shaft and collet and the fuze engagement shaft is
pulled allowing the arming sequence to begin.
5. An initiator assembly as set forth in claim 4 in which the
collet comprises a main body portion slidable in the bore and
gripping members extending axially from the body portion, said
gripping members being spring loaded outward into the divergent
portion of the bore when the collet is in the first position
wherein the fuze engagement shaft can be inserted into the
divergent bore portion and when the fuze engagement shaft moves
said collet from the first position to the second position said
gripping members close about the fuze engagement shaft because of
movement of the gripping members from the divergent bore portion to
the bore portion.
6. An initiator assembly as set forth in claim 5 in which said
gripping members comprise a plurality of axially extending
fingerlike elements; each of said fingerlike elements having a
detent at the outer end thereof for cooperative engagement with a
corresponding detent receiving portion on the fuze engagement shaft
to prevent removal of the fuze engagement shaft when said collet is
in the second position; and
a compression spring mounted in said bore urging said collet into
the first position.
7. An initiator as set forth in claim 6 further comprising:
four gripping members extending axially outward from the collet
main body portion; and
an initiator lanyard attachable to said adapter shaft.
Description
BACKGROUND OF THE INVENTION
The present invention relates to initiators and more particularly
to a fuze initiator assembly to allow arming of projectiles,
missiles, bombs and the like as released, for example, from
aircraft.
Numerous techniques and apparatus have been used to provide fuze
initiation for dropped bombs, however, previous initiators in
existence are very complicated in structure. As an example, known
initiators may consist of assemblies comprising 15 or more
component parts. Initiators of this type are inherently difficult
to assemble, more costly and have limited utility, in other words,
are only of the single use type.
Accordingly, the present invention moves substantially beyond the
prior art and provides a simpler and safer assembly permitting an
extensive reduction in size and weight while eliminating assembly
and dimensional control problems resulting in a more efficient and
compact structure. An object of the present invention is to provide
a substantially improved fuze initiating assembly having fewer
component parts.
Another object is to provide a fuze initiator which contains no
parts which can be lost during handling and loading.
A further object is to provide a fuze initiator which is
resettable.
SUMMARY OF THE INVENTION
The present invention provides an improved fuze initiator assembly
which, when activated, enables the arming sequence to commence. The
initiator is of simple and economical construction and is
resettable. Other details and advantages of this invention will
become apparent as the following description of an exemplary
embodiment thereof presented in the accompanying drawings
proceeds.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings show a present exemplary embodiment of
this invention in which:
FIG. 1 is a cross-sectional view illustrating the exemplary
embodiment of this invention showing the relaxed or first position
of the assembly not connected with the fuze;
FIG. 2 is an end view taken on the line 2-2 of FIG. 1; and
FIG. 3 is a fragmentary cross-sectional view of FIG. 1 showing the
initiator in the assembled or second position.
DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
Reference is now made to the drawings which illustrate an exemplary
embodiment of the improved fuze initiator assembly of this
invention, which is designated generally by the reference numeral
10. The fuze initiator is comprised of a housing 12 which is
installed in a suitable environment such as a tail fuze well until
it seats against a surface 14. Extending axially through the
housing 12 is a stepped bore 16 which has a divergent bore portion
18 formed at one end of the housing 12. An "O"-ring 15 provides a
sealing engagement between housing 12 and the surface 14.
The component part of the initiator 10 which enhances the
uniqueness of the initiator is the collet shown generally as 20.
The collet 20 has a main body portion 21 mounted for slidable
movement in a bore 16. Extending from one end of body portion 21
are a plurality of fingers or gripping members 22 which are spring
loaded or biased open to assume the configuration of the divergent
inner wall 18 of the housing 12. At the extreme outer end of each
of the fingers or gripping members 22 is a claw or detent member
24. The collet 20 responds similarly to the human hand in that when
the initiator is assembled to the fuze, the fingers or gripping
members 22 of the collet clasp a fuze engagement shaft 26. This
completes the link between the fuze engagement shaft and an adapter
shaft.
As shown in FIG. 1, the gripping members 22 of the collet 20 are in
a relaxed or first position. When the initiator is mated to the
fuze, the fuze engagement shaft 26 forces the collet 20 farther
into the housing 12 along the bore 16 to a second position as seen
in FIG. 3. During this assembly, as seen in FIG. 3, the collet
gripping members 22 grasp or close behind the lip or detent
receiving portion of the engagement shaft 26 because of the change
in geometry of the bore as the collet is urged to the second
position.
An adapter shaft 28 is attached to collet 20 by any suitable means
such as threadable engagement therewith and extends through the
bore 16 to the exterior of the housing 12. An initiator lanyard 30
is attached to the adapter shaft 28. The adapter shaft 28 provides
the link between the lanyard 30 and the collet 20. During the
process of releasing the weapon from the aircraft, the lanyard 30
is pulled. This force is transmitted through the adapter shaft 28
to the collet 20. The resulting output function is that the fuze
engagement shaft 26 is pulled enabling the fuze arming sequence to
commence. The portion of the adapter shaft 28 extending outwardly
of the housing 12 is of a greater dimension than the bore 16 which
limits the amount of axial movement of the adapter shaft in one
direction.
A reset compression spring 32 is mounted in bore 16 to act against
collet 20 and serves two functions. The spring 32 insures that the
collet 20 is maintained in the desired first position prior to
initiator assembly to a fuze. Consequently, the lip of the fuze
engagement shaft can always be positioned beyond the detents of the
collet gripping members before these members are closed. Secondly,
when and if the fuze is required to be disassembled from the
initiator, the compression spring 32 insures that the collet 20
will return to the first position, thereby allowing the fingers to
open and releasing the engagement shaft.
In some instances, a fuze requires an electrical interfacing
between the fuze and apparatus in other portions of the bomb.
Electrical contact rings 34 and 36 and lead wires 38 and 40 provide
this interfacing. As an example, a bomb may be intended for a tail
fuze detonation and yet incorporates a proximity fuze in the nose
well. The fuze initiator establishes the electrical circuit between
the nose proximity fuze and the electrical detonator which is
located in the tail fuze. Because of the simplicity of the design,
the electrical components required for this interfacing can be
mounted into the housing as an integral part of the housing
assembly as illustrated herein. It is to be noted, however, that
when no electrical circuitry is required, the initiator may be
assembled without the electrical interfacing.
In operation, the bomb would be assembled by first installing the
initiator 10 into the tail fuze well until it seats against a
surface 14. The fuze is next installed into the tail fuze well.
During this installation, the fuze engagement shaft 26 positions
the collet 20 into the housing 12 until the detents of gripping
members 22 close behind the engagement shaft lip. The initiator and
fuze engagement shaft remain in this second position until the bomb
is released from the aircraft. Upon release, the lanyard pull is
transmitted through the initiator and the engagement shaft is
pulled, allowing the arming sequence to begin.
It is seen that the fuze initiator disclosed herein has the added
advantage that is absent in the prior art in that the present
initiator is resettable. It is possible to pull the lanyard before
the initiator is assembled to the fuze without destroying its
operational capability. The result is that an initiator has been
designed which has few component parts, contains no parts which can
be lost during handling and loading and is resettable.
While a present exemplary embodiment of this invention has been
illustrated and described, it will be recognized that this
invention may be otherwise variously embodied and practiced by
those skilled in the art.
* * * * *