close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2405643

код для вставки
A. 13,
39*";
2,405,643
A, CRQT
STRUCTURAL coNNEdToR
Filed Feb. 7, 1944
//
/
\—K\ '\
W/
//
/ ///I V/ [A
./ 7‘
7
IN VEN TOR.
ANDRE’ EH47?’
‘AGENT '.
2,405,643‘
F'atented Aug. 13, _1 946
uNiTEo STATES PATENT orrlcs
2,405,643 '
STRUCTURAL CONNECTOR
André Crot, Los Angeles, Calif., assignor to Lock-J
heed Aircraft Corporation, Burbank, Calif.
Application February 7, 1944, Serial No. 521,477
6 Claims.
1
(Cl.'189-—-36)
.
This invention relates‘to structural connections,
and relates more particularly to connectors for
aircraft structures and other assemblies.
It has long been the general practice to employ
rivets, screws and welding to connect airplane
parts and components. At points where it is nec
.
disconnection by vibration, but may be inten
~ tionally released with ease'when it is desired to
remove or disconnect the associated parts or sec
tions. This feature of the invention particularly
adapts the connectors for use with closures, pan
essary to service or inspect instrumentalities
els or sections that are intended to be removed
for the purpose of inspecting or servicing elements
Within the assembly.
rivets or screws, or the making of numerous welds
is laborious, expensive and time consuming. Fur
assembly, necessitating the employment of blind
rivets, plate nuts, and the like. Where removable
2
bled or made up and are not subject to failure or
within the aircraft assembly it is the practice to
provide access openings and to equip such open
ings with closures secured in place by releasable
fasteners. The installation of multiplicities of
thermore, there are many situations where the
joints are inaccessible, at least at one side of the
.
nection of the assembled parts or sections. The
connectors are strong and. positive when assem
is
‘panels; closures, etc, are used, numerous releas
able fastening devices are required and consider
‘
Other objects and features of the invention will
be readily understood from the following detailed
description of typical preferred forms of the in
vention wherein reference Will be made to the
accompanying drawing in which,
Figure 1 is a fragmentary perspective view of
a typical aircraft assembly of the type in which
connectors of the invention may be utilized;
Figure 2 is an enlarged transverse detailed sec
able expense is involved in the installation.
It is a general object of the present invention
to provide simple, dependable structural connec
tional view of one form of joint or connection of
tors for use in aircraft asemblies, and other struc
an assembly;
tures where preformed or prefabricated compo
Figure 3 is a fragmentary longitudinal detailed
sectional view taken substantially as indicated by
line 3-3 on Figure 2;
Figure 4 is a view similar to Figure 2 illustrat
ing another‘form of connector of the invention;
nents are to be assembled, that obviates the ne
cessity for employing rivets, screws and welds in
the ?nal assembling of the parts, sections or com
ponents. The joints or connecting devices of the
invention eliminate the need for rivets, screws,
and the like, in ?nally connecting the sections or
components of the assembly and make it unnec
essary to employ blind rivets, plate nuts or similar
expedients in situations where the joints are in
accessible or inaccessible in part.
Another object of the invention is to'provide
structural connectors of the character referred
to that are strong and dependable and positively
connect the parts, sections or components of the
assembly. The connectors are designed to effec
tively resist longitudinal shear as well as forces 40
acting in all other directions ‘and have a strength
equal to or greater than the parts or components
which they connect.
'
the invention showing it associated with parts of
Figure 5 is a fragmentary longitudinal detailed
sectional view taken as indicated by line 5—-5 on
Figure 4 but showing the lock strip before it is
locked; and,
'
Figure 6 is a view similar to Figure 2 illustrat
ing still another embodiment of the invention.
The joints or connectors of the invention are
suitable for use in many different situations and
in‘ structures varying greatly in character. Fur
thermore, the invention is capable of substantial
modi?cation to adapt the connectors for given
purposes and for use in given assemblies. I will
herein describe the invention as employed in air
craft structures, it being understood that this is
merely a typical application and is not to be con
Another'object of the invention is to provide
strued as limiting either the scope or the utility of '
structural'connectors of the character mentioned 45 the invention.
In Figure 1 of the drawing I have illustrated a
that may be easily and quickly assembled with
out special tools or equipment.
portion of an aircraft boom 0r fuselage compris
ing two sections S adapted to be connected by a
A further object of ‘the‘invention is to provide
joint‘ structure or connector of the invention.
connectors of the general class referred’ to which
present smooth flush or substantially ?ush sur 50 Furthermore, the individual sections 5 are sub
faces at the joints and avoid all irregularities at
stantially cylindrical tubular elements and their.
the joints.
axial seams or joints Ill may be provided with
A still further object of the invention is to
selected connectors of the invention. It is to be
provide structural connectors of the class referred
understood that the airplane assembly of Figure
toy that may be quickly released to permit discon 55. 1‘ is merely typical of many structures in which
' ‘2,405,643
3
4
theconnectors of the invention may be employed
into the required assembled positions.
and the invention is not to be considered as lim
be seen that when the serrations II are in full
mesh the connector is capable of assuming ex
ited for use on tubular assemblies or assemblies
of any particular con?guration.
Figures 2 and 3 of the drawing illustrate a
typical preferred form of connector of the inven
tion which comprises two members II formed to
have locking cooperation one with the other,
and a lock strip'IZ for holding the members H
in the interlocking relation.
'
The members I I are intended to be secured to
the edge portions of the components or sec
tions A which are to be connected. In the draw
ing, the adjacent edge portions of the sections
A are ?at, it being understood that the con
It will
tremely heavy longitudinal shear loads.
The lock strip I2 is provided to retain the mem
bers II in the positions where their serrations
H are in full mesh and further serves to lock
or hold the members II against relative trans
verse movement or displacement. The lock strip
I2 is channel shaped or substantially U-shaped
in transverse cross section having two spaced side
parts I 8. The strip I2 is shaped and propor
tioned to engage around the interlocking ?anges
' I4 and its side parts I8 are shaped to cooperate
with the ?anges. Enlargements or bulbs I9 are
provided on the inner surfaces of the side parts
or contoured. The members I I are alike or com
I8 and present convex rounded shoulders 20 for
plementary and where. the connector is to be
cooperating with the shoulders I6 of the ?anges
employed in an aircraft assembly the members - I4. The ?anges I4 have curved concave external
II may be formed of a suitable aluminum alloy. 20 surfaces adapted to receive the bulbs I9 to allow
Inpractice the members II may-be extruded '
full engagement of the shoulders 20 with the
sections of aluminum alloy or the like. The
shoulders I8. When the sections A have been
members I I resemble angle sections and have
brought to the relationship where the serrations
broad or extensive ?anges I3 and inturned
I‘! are in meshing engagement, the lock strip I2
?anges I4 of less extent. The ?anges l3 are
is slid onto the ?anges I4 to bring the shoulders
intended to be attached to their respective com
20_ into engagement with the shoulders I6. This
ponents or sections A of the assembly. The
looks the connector so that the sections A are
?anges I3 may ?atly or evenly engage the inner
positively connected against relative movement
surfaces of the sections A and may bejcontoured
and displacement in all directions. The Walls of
to .conform to contoured sections, although in 30 the trough or channel 2I in the lock strip I2
most cases the ?anges I3 are sufficiently ?exible
are shaped to conform to or readily receive the
to readily conform to such contoured sections.
bulbed edges of the ?anges I4. The lock strip
In accordance with the invention, the ?anges
I2 may be proportioned to extend throughout
I3 are permanently secured to the sections A
the entire length of the joint and is preferably
tobe rigid therewith. The ?anges I3 may be 85 uniform in transverse con?guration to have even
engagement with the ?anges I4.
attached to the sections A by rivets 9, screws,
spot welds, or roll welds. It is usually preferred
Means may be provided to prevent longitudi
to positively secure the ?anges I3 to their respec
nal displacement or movement of the lock strip
tive sections A throughout the lengths of the
I2. This means may comprise a pin or screw
?anges.
.
40 22 engaged in openings in the strip I2 and a
The inturned ?anges .I4 of the members II are
The pin or screw 22 is preferably
in the nature of rims .or beads which prefer
adjacent one end of the connector to be acces
ably extend throughout the entire lengths of the
sible. There is little or no tendency for the lock
members. The ?anges I4 extend along the inner
strip I2 to move longitudinally and the screw
or opposing edges of the ?anges I3 and are thick 45 22 is not required in all installations. In some
ened to have bulbs I5 which present convex
instances a holding means for the lock strip I2
surfaces or shoulders I6 at what I will term the
is entirely unnecessary. For example, in some
rear faces of the ?anges I4. The inner and
structures elements of the assembly may engage
outer corners of the-?anges 14 are also prefer
the opposite ends of the lock strip I2 to hold
ably rounded about suitable radii. In the pre 50 it against endwlse movement.
ferred construction the forward sides or faces of
In situations where the joint or connector is
the ?anges M are formed to have looking or
subject to heavy transverse shear loads it may
meshing cooperation to assume the longitudinal
be desired to employ a, key 23 to assist in assum
shear forces to which the assembly may be sub
ing such loads. Where the key 23 is to be used,
jected. Multiplicities of teeth or serrations I‘! 55 partially cylindrical longitudinal grooves 24 are
are provided on the forward faces of the ?anges
provided in the serrated forward faces of the
I4. The serrations I‘! may be of any selected
?anges I4. The grooves 24 oppose one another
cross sectional con?guration. It is usually pre
and register to constitute a cylindrical opening
ferred to employ serrations I‘! of V-shaped cross
for receiving the cylindrical key 23. 'The key 23
section, as illustrated in Figure 3, to provide 60 is passed or slid into this opening from one end
maximum contact and to assure. full uniform
of the assembly. It will be seen that the key
mating of the serrations. The series of serrations
23 engaged in the grooves 24 is capable of as
I‘! may extend throughout the entire length of
suming heavy transverse shear loads that may
the connector and may be of substantial Width.
be imposed on the assembly. The key 23 is op
In forming the serrations the ?anges‘ I3 of the 65 tional and is not required in all cases. Where
two members may be arranged. in back-to-back
the :key 23 is not used the channel shaped lock
strip I2 conforming to the ?anges I2 and the
relation, and the two members then may be
simultaneously passed through a roll machine to
bulbs I5 thereon positively prevents relative
form identical serrations I’! in the faces of the
transverse displacement of the assembled sec
tow ?anges I4. This mode of forming the ser 70 tions A and dependably assumes transverse shear
rations I'I assures perfect mating or cooperation
loads. ‘Furthermore, the lock strip I4 engaging
of the serrations when the connector is assem
about the ?anges I4 prevents separation of the
bled. The members ,II are attached to the sec
sections and dependably transmits and assumes
tions A to be in the relationship where their ser
tension to ‘which the assembly may be subjected.
rations mesh when the sections A are brought 75
From the ‘above it will be seen that the con
nector may be used with sections that are curved
2,4053%’,
5
g
6
nector illustrated in Figures 2 and 3 is easily made ‘
up or assembled to positively ‘connect the'sections
A of the structure. The sections A may be pre
fabricated to have the members I! secured to
their edge portions and in making up the connec
tion the sections A are ?rst brought to the posi
tions where the serrations ll mesh. Where the
signed to engage iaboutthe ?ange parts 35 to"
assembling operations.
are provided‘ on the side partst‘ia and engage
under or interlock with the bulbs 36 of the ?ange
hold them in the relationship where their serra
tions 31.1are in complete mesh. 'Wherethe con
nector parts'are formed of aluminum alloy, or
the like, the strip 3| maybe an extruded section.
The strip 3| is channel shaped in transverse cross
section having two spaced generally parallel side
key 23 is employed, the key is then inserted into
parts 31*’ and a connecting portion 38. The side
theregistering grooves 23 and the lock strip I2
parts 3% are proportioned to ?t within the
is slid over the ?anges M. This completes the 10 troughs of the J-shaped ?anges 2M. Bulbs 39
The mating serrations -
I‘! are capable of assuming very heavy longitudi
nal shear loads and the key 23 and lock strip.
l2 engaged with the ?ange parts [4 dependabjly
hold the connected sections. against relative
movement in all other directions.
parts 35-. Figure 4 clearly illustrates the manner
in which the bulbs 36 and 39‘engage or interlock,
to retain the members 30 and their sectionsB in
the correctly assembled relationship. It will be
The connec
tion- is strong and positive and will not work
loose under any vconditions of operation orv usage.
When it is desired to disconnect the sections A,
the lock strip 12 is merely slid from the ?anges
l4, and where the key 23 is employed the key is
withdrawn from the grooves 23. This frees the
sections A for disconnection.v The connector i1‘
lustrated in detail in Figures 2 and 3 is used at
the axial joints I!) in the assembly of Figure 1;
this being one typical application of the con
nector.
.
.
.
’ observed that the'bulbed ?ange parts 35(substan
tially conform to the trough of the lock strip 3!
with the bulbs 3E engaging over the bulbs 39'.
This interlocking engagement of the strip 3| and
members 30 positively holds the sections B against
relative transverse displacement and maintains
the serrations 3'.’ in mesh‘ for the dependable
transmission of longitudinal shear loads. It is
25 preferred to make the outer face E6 of the lock
strip 3! ?at or of thesame contour as the sections "
B and to proportion the parts so that the face 49
-
The joint or connector illustrated in Figures 4
lies flush with the outer surfaces of the sections B.
and 5 is such that it may be assembled or made
This provides a flush joint and is of importance in
up from the exterior of the structure and is there 30 aircraft where aerodynamic designs require ?ush
fore advantageous in situations where the interior
joints. The lock strip 3| may be readily slid‘tov
of the structure is inaccessible. The connector
the position where'it cooperates with the ?ange
is useful with closures for access openings, and the
parts 35 throughout the entire-length of the con
like, although not limited to such applications,
nection; The strip 3! is merely entered intothe
and in Figure 1 I have shown the connector join 35 connection at one of its ends and advanced to .its
ing the two sections S of the boom assembly.
?nal position. If required, the. strip 3! may be
The construction of Figures 4 and 5 comprises
secured in its ?nal position by a screw or pin 4!
two members 30 connected to the assembly sec
engaged in openings in the strip and a part 35
tions B and formed to have meshing or interlock
. adjacent one end of the connector.
ing cooperation, and a locking strip 3! for hold 40
The connector of Figures (land 5 may be con
ing the members 30 in the interlocking relation
structed to provide for the quick ready assembly.
ship.
of the sections B. The parts may be formed so
The members 39 are secured to the edge por
that the lock strip 3! may be assembled in its ?nal.
tions of the sections B as by rivets 32, screws
position‘ by merely introducing the side parts 3?“
orwelding. The members 30 are identical angu 4: into the troughs of the ?anges 34; and then shift
lar elements and when formed of an aluminum
ing the strip a short distance in either longitudi"
or magnesium alloy, may be extruded sections.
nal direction. As best illustrated in Figure‘ 5, the
It is preferred to provide the members 36 with
bulbs 36 of the ?ange parts 35 have pluralities
?anges 33 similar to the ?anges l3. The ?anges ,
of spaced interruptions or notches 42. The
33 are arranged against the inner faces of the
notches 42 may be equally spaced and formed to
sections B and are secured to the sections by the
leave teeth or projections 53 of equal width. ' The
rivets 32 or other selected attaching means.
bulbs/39 of the parts 3i“ have similar spaced in
The members 3Q further include inturned or
terruptions or notches’ 44 leaving teeth or. projecé
inwardly projecting ?anges 34 on the main
?anges 33. The ?angest-t are substantially U 55 In assembling the construction of Figures 4 and
or J -shaped in transverse cross section extending
5, the'sections B are first brought to the positions
inwardly from the ?anges 33, then curving later-p
where the serrations 31 are in full meshing en
ally in substantially parallel relation to the planes
gagement. The strip 3i is then arranged so that
of the sections B and then extending outwardly
its side parts 3'!a enter the troughs of the ?anges
or‘toward said plane. I will term the outwardly 60 3E and. the strip is lowered or pressed inwardly
tions 45.
extendingportions, ?ange parts 35. .Bulbs 36
rations 341 preferably extend throughout the
lengths of the ?ange parts 35 and the serrations
‘
‘
>
so that the projections 45 I pass through the‘
are‘provided on the outer edge portions of the
?ange parts 35. The bulbs 36 present curved or
convex shoulders in the troughs of the J ?anges
34. h In accordance with the invention, the oppos
‘ ing faces of the ?ange parts 35 have multiplici
ties of teeth or serrations 31. The series of ser
-
notches 42. Figure 5 illustrates this position [of
65
the strip 3|. The strip 3| is then moved longi;
tudinally in either direction a distance’ equal to
the width of theprojections 53 so that the pro
J'ections 45 of the bulbs/39 engage under the pro-_ '
jections 4130f the bulbs 35, The strip 3i may then
of the two members are identical to accurately
mesh. Ihave shown the serrations 31 of V
shaped transverse cross section, and the serra
be secured in this position ‘by-the pin or screw 4|.
It will be observed that the connection may’ be
readily assembled in situations where it is di?icult '
Or impossible to enter the strip’ 3| from one end
tions 31 may be formed in the same manner as
of the connection.
_
V
.
w
-
p
_»
The jointor connector, of Figure 6 comprises
_ The locking strip 3| is an elongate element. de 75 ;two.members;4‘ij in meshing cooperation and a
the serrations H.
,
_
.
2,405,648‘
7
key or look strip 48 for holding the members
8
Without the necessity of using‘ multiplicities of
screws, rivets or the like, and without the use of
I
Y
.
' '
'
'
special tools; The connectors are positive when
The members 41 may beidentical and‘in prac
assembled and are capable of withstanding heavy
tice may be cut from the'same length of stock.
The members 41 are elongate elements ‘having 5 loads in all directions. The connectors are such
that the joints may be ?ush and without irregu
main ?anges 49 which may be secured to the sec
larities of any kind whatsoever.
tions C of the assembly by'screws or rivets ‘58.
Having described only typical forms of the in
Where the parts are formed 1of an aluminum or
vention I do not wish to be limited to the spe
magnesium alloy, the members 41 may be ex
truded parts. The members 41 may extend 10 ci?c details herein set forth, but wish to reserve
to myself any variations or modi?cations that
throughout the entire length of the joint or con
may appear to those skilled in the art or fall
within the scope of the following claims.
The members 41 are‘further provided with what
I claim:
I will term ?ange-parts 5|. The ?ange parts 55
1. A connector for securing two elements to
extend along the adjacent or opposite edges of
gether in assembled relation to have exposed
the members 41 and their‘forward or opposing
faces in a common plane comprising a member
faces areserrated. The faces of the ?ange parts
to be attached to each element to extend along
5| are provided with serrations 52 similar to the
an edge thereof, a ?ange part extending along
above described serrations l1 and 31. The serra
each member, said ?ange parts projecting'toward
tions 52 are adapted to mesh when the sections C
said plane and presenting opposing forward
are in the correct assembled relationship. The
faces, serrations on the opposite forward faces
mating serrations 52 of the two members 41 are
of the ?ange parts extending in a direction gen
capable of assuming very heavy longitudinal
erally transverse of said edges and adapted to
shear loads.
‘
mate to hold the elements against relative lon
The ?ange parts 5! are shaped to receive the
gitudinal movement, longitudinally extending
internal lock key or strip 48. Each part 5| has
a longitudinally extending opening 53 and a slot
bulbs on the rear faces of the ?ange parts, and
a channel key slid onto the ?ange parts to hold
54 extending from its serrated fa'ce'to join the
opening 53. The slots 54 have ?at generally par
their serrations in mesh and having bulbs for
allel walls lying in planes parallel with the plane 39 cooperating with the ?rst named bulbs to pre
occupied by the sections 0. The walls 55 of the
vent relative transverse'movement between the
openings 53 at the ends of the slots 54 are flat
elements, the channel key presenting a surface
and substantially normal to the walls of the slots.
occupying said plane to be ?ush with said faces
and substantially closing the space between said
The locking strip 48 is inserted in the slots 54
and openings 53 to positively lock or key the
faces.
'
_ 2. A connector for securing two elements to
members 41 together in the assembled relation
where the serrations 52 are, in mesh.v The key
gether in assembled relation comprising a mem
strip 48 is shaped, to generally conform to the
ber to be attached to each element to extend along
slots 54 and openings53. The strip 48 may be . an edge thereof, a channeled ?ange part extend
an extruded section of aluminum alloy, or the like,
ing longitudinally of each member at the inner
where the members 41 are formed of such mate
side of its respective element, each ?ange part
having an inwardly extending flange and a ?ange
rial. The lock strip 48 has a central web 56 and
thickened portions or beads 51 which extend along
extending outwardly from the inwardly extend
its longitudinal edges. The web 56 is shaped and
ing ?ange, serrations on opposing faces of said .
proportioned to ?t the slots 54'and the beads 51 4. outwardly extending ?anges in a generally trans
are shaped to freely ?t the openings 53. The web
verse direction and adapted to mate to hold the
56 may have ?at surfaces for engaging with the
elements against relative longitudinal movement,
?at walls of the slots 54 and the beads 51 prer
and a channel shaped key engaged between said
erably have shoulders 58 for engaging with the
inwardly and outwardly extending ?anges of the
walls 55 of the openings 53.
50 ?ange parts to hold the serrations in mesh and
In assembling the connector of Figure 6, the
to prevent relative transverse movement of the
locked together.
nection.
-
'
>
‘
'
'
sections C are ?rst brought to the correct assem
bled relationship Where the, serrations 52 are
in full mesh. The key strip 48 is then inserted
in an end of the connector assembly to pass into
the slots 54 and openings 53. The strip 48 is ad
vanced or moved to the ?nal position where it
’
elements.
'
3. A connector for securing two elements to
gether in assembled relation comprising a mem
ber 'to be attached to each element to extend
along an edge thereof, a channeled ?ange part
extending longitudinally of each member at the
inner side of its respective element, serrations on
may extend throughout the entire length of the
connector. The strip 48 engaged in the slots 5i’!
opposing .faces of the ?ange parts extending in
and openings 53 positively locks the members 41 60 a generally transverse direction and adapted'to
against transverse displacement and lateral sep
mate to hold the elements against relative lon
aration. The inter?tting serrations 52 secure the
gitudinal movement, and a channel key engaged
sections C against relative longitudinal movement '
in ‘said channeled ?ange parts’ to hold the serra
and are capable of assuming heavy longitudinal
tions'in mesh and to prevent relative transverse
shear load. 'There is little or notendencygfor the Go movement of the elements, said key presenting a
key strip 48 to become displaced, but if desired
surface that is substantially ?ush with the outer
a. pin or ‘screw 58 may be engaged in openings in
a ?ange part 5| and the key strip adjacent an'en'd
of the'connector to hold the strip against longi
faces of- the elements.
tudinal movement. The joint of Figure 6- may
be readily released to permit disconnection of the
ing faces in a common plane comprising a mem
sections by merely removing the screw 59 and
then withdrawing the strip 48.
a
4. A connector for securing two elements to
gether‘ in assembled relation to have correspond
ber to be attached to each element to extend
along an edge thereof, a channeled ?ange part
extending longitudinally of each memebr at the,
inner side of its respective element, vserrations
motors that are 'easilvand quickly assembled 75 on opposing faces of the?ange parts extending
The present invention provides ‘structural _ con- _
2,405,643
10
in a generally transverse direction and adapted
to mate to hold the elements against relative
6. A connector for securing two elements to
gether in assembled relation to have correspond
longitudinal movement, and a channel key re
ing faces in a common plane comprising a mem
movably slid into said channeled ?ange parts
ber to be attached to each element to extend
from an end of the connector to hold the serra
along an edge thereof, a channeled ?ange part
extending longitudinally of each member at the
inner side of its respective element, the ?ange
parts having channels facing outwardly toward
said plane, serrations on opposing faces of the
?ange parts extending in a generally transverse
direction and adapted to mate to hold the elements
against relative longitudinal movement, bulbs in
tions in mesh and to lock the elements against
relative transverse movement, the key presenting
a surface which is ?ush with said faces of the
elements.
5. A connector for securing two elements to
gether in assembled relation to have correspond
10l
ing faces in a common plane comprising a mem
ber to be attached to each element to extend
the channels of said parts, a channel key remov
ably engaged in said channels to hold the serra
extending longitudinally of each member at the 16 tions in mesh and presenting a surface that is
inner side of its respective element, the ?ange
?ush with said faces of the elements, and bulbs
parts having channels facing outwardly toward
on the key cooperating with the ?rst named
said plane, serrations on opposing faces of the
bulbs to prevent relative transverse movement of
?ange parts extending in a generally transverse
the parts, the ?rst and second named bulbs being
direction and adapted to mate to hold the ele 20 notched so that the key may be entered into said
ments against relative longitudinal movement,
channels in a transverse direction and then moved
bulbs in the channels of said parts, a channel key
longitudinally to engage the second named bulbs
removably engaged in said channels to hold the
under said ?rst named bulbs.
serrations in mesh, and bulbs on the key cooper
ANDRE CROT.
along an edge thereof, a channeled ?ange part '
ating with the ?rst named bulbs to prevent rela
tive transverse movement of the parts.
Документ
Категория
Без категории
Просмотров
0
Размер файла
886 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа