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356 1 53
Sept.v 10, 1946.
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Filed June` 19, 1943
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Patented Sept. 10, 1946
Arthur Cyril Webb Aldis, Sparkhill, Birmingham,
England, assignor to Aldis Brothers Limited,
Sparkhill, Birmingham, England
Application June 19, 1943, serial No. 491,525
In Great Britain April 14, 1942
8 Claims. (Cl. 88'-14)
This invention has for its object to provide
improved means for inspecting the straightness of
the bores of riñe and other gun barrels.
In the accompanying sheets of explanatory
Figure 1 is a side elevation of means constructed
in accordance with the invention for inspecting
the bores of rifle barrels.
portion j ofthe bracket, the upper centre serving
as an opaque mask between the light source and
the bore of the rifle barrel h. In the example
shown the light source o has the form of an elec
tric lamp of high intrinsic brightness, and is ad
justably mounted in a holder p in the housing n,
the bulb of the lamp being preferably frosted
to afford diffused illumination.
The lower centre g is open at both its upper
Figures 2 to 6 are views illustrating to a larger
scale various parts of the means shown in Fig 10 and lower ends, and extends through the upper
side of the lower bracket d which is made to a
ure 1, Figures 2 and 3 being respectively a front
hollow form. At its outer end the upper side of
elevation and a sectional side elevation of the up
the lower bracket cl is formed with a socket q in
per part, Figures 4 and 5 being respectively a front
which is secured the lower end of a tubular hous
elevation' and a sectional side elevation of the
lower part, and Figure 6 being a horizontal sec 15 ing r, the arrangement being such that the hous
ing extends from the upper side of the bracket
tion on the line 6-6 of Figure 4.
' at any convenient inclination away from the post
Figure 7 is a plan of a modified detail.
a. Supported in and extending from the outer
Figures 8 and 9 are sections taken respectively
rend of the housing r is a telescope s which at its
on the lines 8-8 and 9-9 of Figure 7.
Figure 10 is a side elevation of a modiñed form 20 inner end abuts against-an annular shoulder t
in the socket q, the telescope having an eye-piece
of the invention.
u at its outer end, and an object lens (not shown)
Figures 11 and 12 are side `elevations taken at
in its inner end. In the interior of the lower
right angles to each other of another modiñed
bracket d and near its upper side is mounted a
form of the invention.
In carrying the invention into elïect as shown 25 light-deflecting prism v whereby the bore of the
riñe barrel h, can be viewed through the telescope
in Figures l to 6, I employ a vertical post a which
s, the prism being arranged and adapted to de
at its lower end is secured to a supporting base b
flect the optical axis of the telescope through the
lower centre g, and the clear aperture of the ob
On the upper part of the post a is secured a 30 ject lens in the telescope being larger than the
diameter of the barrel bore.
bracket c, and on the lower part of -the post is
To enable the rifle barrel h to be mounted in
secured another bracket d, the distance between
position between the hollow centres Í, y, the upper
the two brackets being dependent on the length
centre f is moved upwardly against the action of
of the rifle barrels whose bores are to be inspected.
The brackets c, d, respectively carry a pair of 35 the spring m. For effecting this movement a lever
w is connected by a pivot a: near one end to the
hollow centres j, g, which are arranged coaxially
lupper bracket c, and is shaped at this end to a
with each other, and by which a rifle barrel
fork-like form for engaging the under sides of
(shown in broken lines and indicated by `h.) can
a pair of pins y secured to and extending from
be supported in a vertical position, the inner ends
of the centres being shaped to a conical or like 40 opposite >sides of the upper centre f, so that down
ward movement of the other end of the lever
form so that they can `enter and support the ad
causes the required upward movement of the up
jacent ends of the riñe barrel.
-per centre, the latter end of the lever being pro
The upper centre f is slidably supported by and
vided with a chain z or being otherwise adapted
extends from the lower end of a hollow cylindri
cal portion i of the upper bracket c, the upper 45 to be actuated by an attendant.
At a position midway between the brackets c, `
end of this centre being open and the lower end
d, a third bracket 2 is secured on the post a, and
closed except for an axial oriñ-ce 1c of small diame
to this bracket is pivotally connected the centre
ter. The hollow portion y' of the bracket c is
of a substantially vertical lever 3 having secured
closed at its upper end by a glass window l, and
adapted to rest on a bench or on the ground, the „
post and base being conveniently of hollow form.
contains a helical compression spring m which 50 to its ends V-shaped supports 4, 5, for the adja
cent parts of the riile barrel h. The pivot 6 of
by acting on the upper end of the centre f tends
the lever 3 is situated opposite to the position oc
to hold the latter in its lowermost position. On
cupied by the centre of the riñe barrel h, and the
the upper‘bracket c is mounted a housing 'n for
arrangement is such that when the rifle barrel
a light source o whereby the orifice lc in the upper
centre f can be illuminated through the hollow 55 occupies the position shown the lower support r5
abuts against an adjustable stop 1 on the bracket
d, and when the position of the barrel is reversed
the upper support 4 abuts against another ad
justable stop 'l’fl on the bracket c.
ing down of the blurred portion of the image as
the pressure is applied.
In certain cases the viewing telescope s may
be provided with a fine scale graticule (not shown)
When the rifle barrel h is mounted in position
between the centres f, g, there is seen on looking
into the eye-piece u of the telescope s, an image of
the orifice 7c in the mask formed by the upper
centre f, this image being surrounded by a bright
concentric circle, with other larger concentric
circles around it.
The inner concentric circle arises from rays
which is seen in the ñeld of View simultaneously
which are reflected once from the whole surface
of the bore of the rifle barrel h for a distance
To enable the telescope s to be adjusted in a
vertical plane about the inner end of its housing T
of two-thirds the length of the barrel measured
from the viewing end, (always provided the aper
for bringing the required part of the image above
ture of the object lens in the telescope s includes
the whole diameter of the bore).
If the bore of the rifle barrel h is straight for
the whole of this two-thirds len-gth the inner
circle is seen as a sharply deñned thin line of
uniform width, and, furthermore, if the axis of
this straight portion accurately passes through
the centre of the orifice 7c, this inner circle is
concentric with the image of the oriiice. If the
said two-thirds lengtlïöffthe' barrel is straight
but points in a direction"~ out of line with the
with the image of the central oriñce lc and the cir
cles surrounding it.
The brackets c, d and 2 are axially adjustable`
on the post a to suit rifle barrels of diiîerent
lengths, but are prevented from angular move
ment by rib-like projections I I on adjacent parts
of the post.
described to the centre of the ñeld of view, the
housing is of larger diameter than the body part
of the telescope, and is provided at its upper end
with an adjusting screw I2 and a spring-loaded
plunger I3 adapted to act on opposite sides of
the said body part, the outer end of the housing
being shaped to prevent sideways movement of
the telescope. This adjustment enables the corre
sponding arcs of the second and third concentric
circles to be brought under observation for locat
ing bends in the bore of the barrel. These circles
arise from rays that have been respectively twice
and three times reflected from the bore of the
orifice, then the inner circle will be sharply de
barrel. The adjustable part of the micrometer
fined but eccentrically placed with regard to the
image of the orifice. If, on the other hand, the 30 mechanism is provided with three different scales
(not shown) corresponding respectively to the
said length of 'thebarrel is not straight, the circu
ñrst, second and third circles, and these scales
lar image will appear blurred at one or more posi
can be observed through three helical windows
tions, or will be duplicated eccentrically.
9a shown in Figures 1 and 5.
To facilitate location of the position of the
For añording access to the lamp o, its housing
deformation in the bore to which the eccentric
n is pivoted at I4 to the lamp holder p which is
`circle or the blurred appearance of the circular
secured to the upper end of the hollow portion 7'
image is attributable, I mount in the interior of
of the bracket c, a spring-loaded ball or other
vthe lower bracket d and between the prism o and
detent I5 on the lamp holder being adapted by
the lower centre g a transversely movable slide 8
which extends through the inner and outer sides 40 engagement with a recess in the lamp housing
to hold the latter in its service position.
of the bracket, and which has associated with its
Instead of the slide 8 above described I may
outer end actuating means in the form of cali
employ the modiñcation shown in Figures 7 to
brated micrometer mechanism 9 mounted on the
9 in which the parts similar or analogous to
bracket. The slide 8 is provided with a straight
those above described are indicated by the same
edged aperture Il] which is situated beneath the
reference characters suiñxed by “1.” In this
_lower centre g, and with another aperture IE)a
modiñcation a slide 81 is movable across the
situated between the prism v and the telescope s,
hollow bracket d1 by the micrometer mechanism
the latter aperture being sufliciently large to
91 against the action of springs I6, and at right
prevent obstruction by the slide of the light path
angles to this slide is arranged a second slide I'I,
between the telescope and prism throughout the
the latter being supported by the bracket and
whole range of movement of the slide. To locate
movable in any convenient manner. Arranged
the position of the deformation in the bore of
between and movable by both of the two slides
the barrel 11, the slide 8 is moved in o-ne direction
81, I'I is a third slide I8. The two slides 81, I‘I are
until one of the eccentric circles or the blurred
formed respectively with elongated openings I9,
portion of the image is masked by one of the
straight edges of theaperture I0, the amount
of such movement being readily ascertainable
from the micrometer mechanismß which may be
Aconveniently calibrated in terms of distances
along the barrel. The'siide a may then be moved 60
in the opposite direction to obtain a similar effect
with the opposite straight edge of the aperture
I0, the reading thus obtainable from the microm
20 arranged to prevent obstruction by these slides
of the light path between the lower centre and
prism above described. The third slide I8 is
formed with a pair of oppositely arranged D
shaped openings 2| having their straight edges
in alignment with each other and parallel with
the longitudinal axis of the second slide I'I, these
openings being arranged to overlap at the ad
jacent ends so that their aligned edges are sep
eter calibrations serving as a check on the previ
arated by a gap as shown. By moving the sec
ous reading.
ond slide I'I to bring either of the D-shaped
Having examined the barrel h, from one end
openings 2| opposite to the opening I9 in the
`the position of the barrel can be reversed so that
slide 81, the straight edge of this D-shaped open
the two-thirds length of the barrel from the oppo
ing can be used in a similar manner to the
site end may be similarly scrutinized.
corresponding edge of the previously described
In the case where a deformation is located in
aperture I0 for locating a deformation in the
the barrel h, suitable means may be brought into
bore of the barrel. By moving the second slide
operation for applying corrective pressure to the
I'I to an intermediate position a comparison can
gun barrel, the straightening eiïect of which can
be made between the eiîects produced by the
be observed through the telescope s by the narrow 75 straight edges of both D-shaped openings 2|.
' 5
The example shown in Figure 10 is suitable for
use in inspecting the bores of gun barrels larger
other gun barrel, comprising the combination of
a pair of hollow centres arranged coaxially with
each other and at a suñicient distance apart to
enable the barrel to be mounted between them,
gous to those above described are indicated by
the same reference characters suñixed by “2.” 5 one of the centres having a closed end which
serves as a mask and has a relatively small axial
In this example, the lamp housing n2 is mounted
oriñce, optical viewing means associated with the
on the base b2 at one side of the post a2, and the
other centre and arranged so that images formed
hollow centre f2 which serves as the `mask is
by reñection of the orifice in the bore of the
mounted on the lamp housing and may have a
barrel can be inspected, a transversely movable
rounded upper end. Also the bracket 22 carries
slide arranged in association with the latter
a V-shaped crutch-like supporting member 22 for
centre and the viewing means and operable to
the centre of the gun barrel h2, this member be
ascertain the position of a defect in the said
ing adjustable by a hand wheel 23. Moreover, the
bore by partially obstructing the light path be
other centre g2 is mounted on a hollo-w body Z4
which is carried by the bracket c2 through the 15 tween the associated centre and viewing means,
and supporting means whereby the two centres,
medium of a parallel motion linkage 25, the lat
the optical viewing means, and the slide are
ter being loaded by a strong spring 26. On the
supported in the required relationship.
side of the hollow body 24 remote from the link
2. Means as claimed in claim 1, in which the
age 25 is mounted the micrometer mechanism
92, and in'this body is mounted the transversely 20 supporting aneans comprise in combination a sup
porting base, a post on the base, a bracket
movable- slide above described. On the upper
mounted on the post and carrying the hollow
side of the hollow body 24 is mounted a cham
centre forming the mask, a second bracket mount
ber 24B- containing the prism v2, and from one
ed on the post and carrying the other hollow
side of this chamber extends the housing r2 car
centre, the optical viewing means, and the trans
rying the telescope s2. The hollow body 24 and
versely movable slide, a third bracket mounted
the parts carried thereby form a unitary struc
on the post at a position (between the first and
ture which can be moved upwardly to enable the
brackets, and means on the third bracket
gun barrel h2 to be placed in position. This
for aiîording lateral support to the barrel.
movement is assisted by the spring 26 which also
3. Means as claimed in claim 1, in which the
serves to retain the said unit in its raised posi 30
means comprise in combination a sup
tion until it is again moved downwards, the ar
porting base carrying the hollow centre form
rangement being such that the effect of the spring
ing the mask, a post on the base, a bracket
is reduced as the hollow body 24 is moved down
mounted on the post and carrying the other holwards and is increased as the body is moved up
than rifle barrels, and the parts similar or analo
wards. The base b2 may be provided with ad-' 35
justable supporting screws as 2l.
Another possible form of the invention is shown
in Figures 11 and 12 in which parts similar or
analogous to those above described are indicated
by the same reference characters suiiixed by 40
“3.” In this example the housing 13 of the tele
low centre, the optical viewing means, and the
transversely movable slide, a second bracket
mounted on the post at a position between 'the
base and the ñrst bracket, and means on the
second bracket for affording lateral support to
the barrel.
4. Means as claimed in claim 1 in which the
optical viewing means comprise in combination
scope is provided at its inner end with an en
largement 28 from one side of which extends
the micrometer mechanism 93 and which con
a telescope, a hollow Ibody on which the tele
scope is mounted, and a prism arranged in the
ject the image on to a screen situated at a dis
combination with the transversely movable slide,
interior of the hollow body and adapted to de
tains the transversely movable slide above de 45 ñect
the optical axisgouiwthe telescope through the
scribed. At the side opposite to the telescope
adjacent ho1low'-'ë'entre,‘"`tlie latter being carried
housing r3 its enlargement 28 is formed or pro
by the said hollow body.
vided with the centre g3, the latter being situ
ated coaxially with the telescope s3. The lamp
supporting means comprise in combination a
housing n3 is formed or provided with the other
supporting base, a post on the base, a bracket
centre f3 which serves as the mask. Both the
on the post and carrying the hollow
enlargement 28 of the telescope housing r3 and
the mask, a second bracket
the lamp housing n3 are provided with arms 29,
mounted on the post and carrying the other hol
and are interconnected by tension springs 30 at
tached to the ends of the arms, the arrangement 55 low centre, the optical viewing means, and the
transversely movable slide, a third bracket
being such that the springs can lie symmetrically
mounted on the post at a position between the
along the sides of the gun barrel h3.
first and second brackets, a lever p-ivoted at a
Instead of being adapted for use by direct
position between its ends to the third bracket,
vision, with the eye of the observer placed near
and end pieces on the lever for accommodating
the eye-piece, the telescope in any of the ex
adjacent parts of the barrel.
amples above described may be adapted to pro
6. Means as claimed in claim 1 and having in
tance from the eye-piece.
By this invention inspection of the straight
a second slide carried by and also movable at
right angles to the ñrst mentioned slide, and
ness of rifle or other gun barrel bores can be 65 means for moving the second slide relatively to
carried out in a Very expeditious manner and
with a minimum of fatigue. Moreover, all the
the first slide, the two slides being formed with
apertures through which the bore of the barrel can
be inspected, the aperture in the second slide hav
The invention is not however limited to the ex
ing a pair of parts which are displaced relatively
amples above described as subordinate details
to each other in the direction of movement of the
may be varied to suit requirements.
second slide so that by appropriate movement
Having thus described my invention what I
of the second slide either of the said parts can
claim as new and desire to secure by Letters Pat
be registered with the adjacent part of the aper
ent is:
1. Means for inspecting the bore of a rifle or 75 ture in the first slide, and the two parts of the
operations can be carried out by artificial light.
aperture in `the second slide being formed with
and situated at opposite sides .of a pair of aligned
fault-locating' straight edges so arranged that by
movement of the second slide relatively to the
ñrst slide either of the said edges can be brought
to a service position opposite to the aperture in
the first slide for the purpose described.
association with the viewing means and oper
able to ascertain the position of a defect in the
said bore, by partially obstructing the light path
between the interior of the barrel and the view
ing means, and supporting means whereby the
mask, the viewing means, and the slide are sup
ported in the required relationship.
8. Means as claimed in claim '7, in which the
supporting means comprise tension springs in
other gun barrel, comprising the combination of
amaslgipg member adapted to be mounted at one 10 terconnecting the masking member and the op
tical viewing means and adapted to lie along
en‘îìr'wñe barrel and having an axial orifice
side the barrel so as to hold the said member and
which can be illuminated from .any convenient
optical viewing means in position on the corre
source of light,y opticaliviewing means adapted
sponding ends of the barrel, the said viewing
to be mounted at the other end‘oi the barrel and
means serving to carry the transversely movable
arranged so >that images formed by reflection of
the oriñce inthebore. of the barrel can be in
spected, a transversely movable slide arranged in
7. Means for inspecting the bore of a rifle or
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