U.S. patent number 3,834,053 [Application Number 05/354,773] was granted by the patent office on 1974-09-10 for methods and apparatus for detachably assembling the barrel of a firearm.
This patent grant is currently assigned to J. P. Sauer & Sohn GmbH. Invention is credited to by Gerlinde Bielfeldt, by Karsten Bielfeldt, Heinz Bielfeldt, deceased, by Christiane Diehl.
United States Patent |
3,834,053 |
Bielfeldt, deceased , et
al. |
September 10, 1974 |
METHODS AND APPARATUS FOR DETACHABLY ASSEMBLING THE BARREL OF A
FIREARM
Abstract
A firearm includes a slit receiver socket for detachably
receiving a barrel, and a spacer element disposed between the rear
of the barrel and the end of the socket to define the rearmost
position of the barrel. The spacer element may include a plurality
of discs which are adhered together. Discs may be added to or
removed from the spacer element to adjust the size thereof.
Inventors: |
Bielfeldt, deceased; Heinz
(LATE OF Eckernforde, DT), Bielfeldt; by Gerlinde
(Eckernforde, DT), Bielfeldt; by Karsten
(Eckernforde, DT), Diehl; by Christiane (Kiel,
DT) |
Assignee: |
J. P. Sauer & Sohn GmbH
(Eckernforde, DT)
|
Family
ID: |
5851363 |
Appl.
No.: |
05/354,773 |
Filed: |
April 26, 1973 |
Foreign Application Priority Data
|
|
|
|
|
Jul 21, 1972 [DT] |
|
|
2236001 |
|
Current U.S.
Class: |
42/75.02;
42/1.07 |
Current CPC
Class: |
F41A
21/482 (20130101); F41A 21/487 (20130101) |
Current International
Class: |
F41A
21/48 (20060101); F41A 21/00 (20060101); F41c
021/00 () |
Field of
Search: |
;42/75B,1Q,76R,77
;89/14R,16 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Borchelt; Benjamin A.
Assistant Examiner: Jordan; C. T.
Attorney, Agent or Firm: Burns, Doane, Swecker &
Mathis
Claims
What is claimed is:
1. In a firearm having a barrel and receiver means; the receiver
means including socket means for detachably receiving a rear end
portion of a barrel, support means disposed generally beneath said
socket means, longitudinal slit means formed in said support means
to permit contraction of said socket means, and releasable clamping
means for inducing convergence of opposite sides of the slit means
to contract said socket means; and axial stop means for defining
the rearmost axial position of said barrel; said axial stop means
comprising spacer means inserted between an end portion of said
barrel and the base of said socket means.
2. A firearm according to claim 1 wherein said socket means and the
end of said barrel include corresponding thread means.
3. A firearm according to claim 1 wherein said spacer means
comprises a plurality of discs adhesively secured together and
disposed between the end walls of said barrel and said socket
means.
4. A firearm according to claim 3 wherein said socket means and the
end of said barrel include corresponding thread means.
5. A firearm according to claim 3 wherein said discs include
aligned central apertures therethrough.
6. A firearm according to claim 1 wherein said spacer means
comprises at least one shim, said shim including a central aperture
therethrough.
7. A method of adjustably assembling a barrel within a receiver
socket of a firearm, said method comprising the steps of:
providing a spacer element;
inserting said spacer element within said receiver socket;
inserting said barrel within said receiver socket such that a
portion of said barrel abuts said spacer element; and
securing said barrel within said socket.
8. The method according to claim 7 wherein said step of providing a
spacer element includes the step of adhering together a plurality
of shims.
9. The method according to claim 7 wherein the step of providing a
spacer element comprises the step of detaching at least some of a
plurality of adhering shims which define said spacer element.
Description
BACKGROUND AND OBJECTS OF THE INVENTION
The invention relates to a firearm, preferably a hand-held firearm,
with a replaceable barrel, which barrel has its rear end detachably
inserted into a corresponding recess of the receiver head. The
rearmost position of the barrel is defined by an axial stop. The
receiver head or socket has a longitudinal slit in its underside
facing the shaft or socket and is arranged in a reinforced manner
as an abutment or support. Clamping elements are provided which
releasably clamp together the opposing sides of the abutment which
face each other along the longitudinal slit, in general accordance
with related U.S. Birkenhagen patent application, Ser. No. 126,441,
filed on Mar. 22, 1971, now U.S. Pat. No. 3,731,418.
This type of construction, as expressed in the related application,
has the advantage that the barrel of the weapon or firearm can
easily and quickly be replaced without the requirement of a
subsequent refinishing or reworking to "zero-in" in the firearm,
accordingly whereby no special tools are needed. Since, however,
the determination of the distance between the end of the barrel and
the breech is accomplished by a locally fixed edge on the receiver,
against which edge the barrel, with a flange, is pulled, a
subsequent adjustment of the distance of the barrel relative to the
breech is no longer possible.
It is the general object of the invention to remedy this
situation.
It is a principal object of the invention to provide a novel
firearm combination affording the replacement of barrels without
the need for special stop edges on the barrel which must be of
close tolerance.
It is yet another object of the invention to provide such a
combination wherein the distance between the breech mechanism and
the rear end of the barrel can be conveniently and effectively
adjusted.
BRIEF SUMMARY OF THE PREFERRED EMBODIMENT
In achieving at least some of these objectives, the preferred
embodiment of the invention involves the insertion of at least one
spacer element between the end of the barrel and the base of the
recess in the head of the receiver, into which the end of the
barrel is inserted. This spacer then constitutes the axial
stop.
The barrel therefore is inserted into the recess in the head or
socket of the receiver to such a point until it abuts firmly
against the spacer and is then clamped down firmly by the clamping
arrangement for further use. At the same time, there is the
possibility to regulate exactly the desired distance of the end of
the barrel from the breech by a suitable selection of thickness and
number of spacers.
The preferred spacers employed are those which are built up from a
multiplicity of very thin individual shims, preferably discs, which
are held together by some adhesive.
In the production of the weapon in this manner, one can proceed
considerably more economically, insofar as it will be possible to
permit considerable production tolerances in the case of the use of
a laminated spacer of 1 mm thickness. Thus, the barrel, the
receiver, and the chamber bolt or breech elements can be made
according to the points of view of modern serial production. The
adjustment of the breech distance in each case is accomplished
solely by insertion of the spacer, the thickness of which is
largely variable by pulling off or adding on individual layers of
shims.
It has furthermore turned out to be of advantage to provide both
the end of the barrel and the recess in the head of the receiver,
as known per se, with a corresponding thread. In this fashion,
after insertion of the spacer, or of several spacers, into the
recess, the barrel first of all is screwed sturdily against the
spacer and the head of the receiver is clamped down by the clamping
elements for fixing the barrel in place.
THE DRAWING
Other objects and advantages of the invention will become apparent
with reference to the following detailed description of a preferred
embodiment thereof in connection with the accompanying drawing,
wherein like reference numerals have been applied to like elements
and in which:
The only FIGURE in the drawing shows a longitudinal section through
a firearm at the rear end of the barrel, in accordance with the
invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
The barrel, designated by 10, has a rear end portion 11. The rear
end 11 is slightly thinner in its diameter than the front of the
barrel and is provided with an abutment or support 14, developed
slightly reinforced, in front of the receiver socket or head 13
seated on the receiver breech casing 12. This abutment 14 has a
longitudinal slit indicated in the drawing and is penetrated
transversely by clamping elements 15. In the receiver, the breech
bolt 16 can be recognized with the firing pin 17 mounted in it. The
remaining elements do not need to be specially designated in this
connection, as they are conventional.
The embodiment shown by way of example has a threaded connection 18
between the receiver head 13 and the rear end 11 of the barrel 10.
Thus, the barrel, with its clamping element 15 relaxed, can be
separated, without the aid of special tools, by screwing from the
receiver head.
To this point, the firearm has been described in accordance with
the basic principles of U.S. Birkenhagen Pat. Application Ser. No.
126,441, filed Mar. 22, 1971, now U.S. Pat. No. 3,731,418, and
assigned to the assignee of this invention. The disclosure of this
Birkenhagen application is incorporated herein by reference.
In order to produce now the required distance between the breech of
the firearm and the rear end of the barrel, a spacer element 19 is
inserted at the base of the recess in the receiver head 13.
Subsequently, the barrel is screwed in by means of the thread 18
into the receiver head 13 to such a point until it rests firmly on
or against the spacer element 19. The spacer element 19 comprises
one or more shims preferably in the form of discs, the number and
thickness thereof depending upon the size of the distance required
between the breech mechanism and the end of the barrel. If a
plurality of discs are employed, they are preferably detachably
glued together. The discs include aligned central apertures to
permit passage of a cartridge therethrough.
To deploy a different sized spacer element, a new spacer element
may be substituted. Alternatively, discs may be selectively added
to or peeled from the spacer element already in use.
SUMMARY OF MAJOR ADVANTAGES AND SCOPE OF THE INVENTION
With this invention, a precise adjustment of the required distance
between the breech mechanism and the barrel end is possible without
there being any need for a stop edge always being present
immediately on the barrel, which edge is subject to production
tolerances and runs against or abuts a collar at the head of the
receiver. The mounting is as simple as possible and the storage of
the spacers is not expensive. Moreover, the spacer element can be
conveniently adjusted for various barrels.
Although the invention has been described in connection with a
preferred embodiment thereof, it will be appreciated by those
skilled in the art that additions, modifications, substitutions and
deletions not specifically described may be made without departing
from the spirit and scope of the invention as defined in the
appended claims.
* * * * *