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Патент USA US3043412

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July 10, 1962
H. w. NORRIS
’
3,043,396
DEMOUNTABLEI STEPS AND PLATFORMS FOR MOBILE HOMES
Filed March 18,1959
F
3 Sheets-Sheet 1
¢
F’ "i
IN VEN TOR.
'
"CV/mam
July 10, 1962
H. w. NORRIS
'
3,043,396
DEMOUNTABLE STEPS AND PLATFORMS FOR MOBILE HOMES
Filed March 18, ‘1959
'
,_
/05
,
3’ Sheets-Sheet 2
_
> INVENTOR.
w ‘- ‘Wm/04w A/om
Arm/W5)’.
July 10, 1962
H. w. NORRIS
3,043,396
DEMOUNTABLE STEPS AND PLATFORMS FOR MOBILE HOMES
Filed March 18, 1959
. 3 Sheets-Sheet 3
-
IN VEN TOR.
ATTORNEY
HC@
3,643,396
Patented July 10, 1952
2
FIG. 8 is a fragmentary transverse cross sectional'view
.
3,043,396
DEMOUNTABLE STEPS AND PLATFORMS FOR
MOBILE HOMES
taken along the plane of the line 8-8 in FIG. 7.
FIG. 8A is a fragmentary cross sectional view showing
part of FIG. 8 at an enlarged scale.
FIG. 9 is a fragmentary inside elevational view similar
Filed Mar. 18, 1959, Ser. No. 800,294}
14 Claims. (Cl. 182—-106)
to FIG. 7 but illustrating a further modi?ed form of the
releaseablef connection between the elements of the plat—
This invention relates to improvements in demount
form.
‘
able steps and platforms for mobile homes. The prin
FIG. 10 is a fragmentary transverse cross sectional
cipal objects of this invention are:
10 view taken along the plane of the line 10‘—10 in FIG. 9.
\First, to provide a demountable porch and step assembly
Harold W. Norris, 12-18 Sylvan Ave., Battle Creek, Mich.
FIG. 11 is a fragmentary ‘horizontal cross sectional view
for trailer homes which can be easily disassembled for
taken along the plane of the line 11—11 in FIG. 10.
loading into the trailer and easily erected for use along
FIG. 12 is a fragmentary inside elevational view of the
side or in front of the trailer door.
supported
tread element appearing in FIGS. 9, 10 and 11
Second, to provide a demountable step and platform 15
and illustrating the cammed surfaces thereon.
structure which requires a minimum of connecting bolts
FIG. 13 is a fragmentary cross sectional view taken
that have to be tightened and unscrewed in assembling
along the plane of the line 13—13 on FIG. 12.
and disassembling the platform and which remains ?rmly
FIG. 14 is an end elevational view of the pin or stud
connected without tilting when in use.
Third, to provide a mobile platform and step structure 20 shown in FIGS. 9, l0 and 11.
FIG. 15 is a cross sectional view through the cammed
with hook and pin connections between the elements of
surface
of the stud taken along the plane of the line
the structure that are easily assembled simply by engag
15—15 in FIG. 14.
ing the hook elements over and behind the pin elements
FIG. 16 is a perspective view of the stud shown in
‘and in which the hook and pin parts of the connections
form coacting cammed surfaces wedging the elements 25 FIG. 14 prior to its assembly into the platform structure.
FIG. 17 is a fragmentary horizontal cross sectional
tightly together.
view taken along the plane of the line 17-17 in FIG. 4.
Fourth, to provide a demountable platform and step
Demountable platforms and steps for mobile homes are
structure having hook and pin connections between its
generally
old. It is'a primary object of such platforms
elements in which the pin parts of the connections are
hollow and adapted to receive bolts for selectively con~ 30 and steps to provide a su?iciently solid or rigid step and
platform for easily entering into the trailer while permit
meeting a hand rail support to the structure.
Fifth, to provide a novel form of hook and pin or ‘
stud connection between two demountable members in
which the stud and hook have vertically and ‘horizontally
ting easy assembly and disassembly of the stair and plat
form so that it can be loaded into the trailer whenever
the trailer is moved. Ordinary bolted connections between
the elements of the platform, step and supporting elements
35 permit the assembly to be disassembled, but are incon
faces disposed at slightly different angles so that engage
venient in that quite a number of ‘bolt connections must be
ment of the hook and stud elements causes frictional
made or removed and the connections are apt to loosen
gripping contact between the elements that resists dis
and permit the assembly to wobble unpleas‘antly or even
engagement of the connected members.
Sixth, to provide a hook and stud connection having 40 nnsafely in long periods of use. The present invention
provides a demountable platform and step structure With
interlocking cammed surfaces angled with respect to each
a
novel form of hook and stud connection between its
other in three coordinate planes to assure tight engagement
extending interlocking surfaces with opposed cammed
between the members under the in?uence of work loads
applied to the connected members.
Other objects and advantages of the invention will be
apparent from 1a consideration of the following descrip
tion and claims. The drawings, of which there are three
sheets, illustrate a highly practical form of platform and
step structure connected according to the invention and
four modi?ed forms of the connection between the ele
ments of the platform.
\FIG. 1 is a side elevational view of a small porch and
step structure adapted to for use with trailer homes and
embodying the releasable connections of the invention.
FIG. 2 is a fragmentary enlarged cross sectional view
taken along the plane of the line 2—-2 in FIG. 1.
\FIG. 3 is a fragmentary composite or exploded view
of the platform and support elements ‘of the structure
illustrated in disassembled relation and in elevational view.
elements which is easily assembled simply by dropping. the
hook elements over a projecting stud or vice versa. The
necessary rigidity of the structure is provided 1by novel
coacting cam-med surfaces on ‘the connected members.
FIG. 1 generally and conventionally illustrates a porch
and step assembly consisting of a relatively broad plat
form 1 and a step or tread 2. The outer or front end of
the platform and the tread 2 are supported by side support
frames 3 of welded “strip steel. Separate legs 4 support...
the rear edge of the platform. Where desired uprights or
supports 5-5 for a hand rail 6 may be attached to the
platform assembly on either or both sides thereof. The
connections between the supporting and supported parts
of the platform assembly are indicated conventio'nally’at 7.
FIG. 2 discloses in greater detail and in plan view the
connection between the front c-ornerof the platform 1,
the side support 3 and one of the uprights 5. The plat
FIG. 4 is a fragmentary transverse cross sectional view 60 form 1 which is in effect an extra wide. step or'tread con
taken along the plane of the line 4—-—4 in FIG. 3.
‘FIG. 5 is a fragmentary exploded elevational view simi
lar to FIG. 3 but illustrating a modi?ed form of support
ing connection between the members.
FIG. 6 is a transverse cross sectional view taken along 65
the plane of the line 6—,-6 in FIG. 5.
FIG. 7 is a fragmentary inside elevational view of a
sists of a ‘supporting border rim 8 of vangular cross section
with an open mesh deck or platform 9 secured to the
underside ‘of its horizontal ?ange. The vertical ?ange 10
along the side of the border rim 8 defines a downwardly
diverging notch 11 forming a hook that fits over the shank
12 of apin or stud 13 carried by the support member
3. The pin 13 is hollow or tubular with a hole 14 formed
therethrough and is secured to the support 3 by having its
further modi?ed form of the connection between the plat
end
riveted over as at 15 to tightly clamp the shank 12
form and step elements with their parts in assembled con
dition.
70 against the inner side of the support. An enlarged head
16 on the inner end of the shank 12 hooks behind the
FIG. 7A is a fragmentary elevational view of the sup’
‘inner side of the ?ange 10. The hole 14 in the stud pro—
ported platform or tread shown in FIGS. 7 and 8.
8,043,396
vides space for selectively passing a bolt 17 therethrough
for clamping the support 5 to the platform.
of the stud. Desirably the angle of convergence of the
surfaces 19B is slightly greater than the angle of con
With particular reference to FIGS. 3 and 4 and l7 it
vergence of the surfaces 18B so that a similar ‘Wedging
action to that in FIGS. 4 and 6 is achieved. FIG. 8A
shows the angular relation of the cammed surfaces at a
will be noted that the inner side edges of the notch 11 are
beveled or cammed as at 18 and that the outer opposed
surfaces of the head 16 are oppositely cammed as at 19.
larger scale.
The sides ‘of the shank 12 and the adjacent sides of the
’
'
FIGS. 9 to 16 illustrate another form of releasable
Vheadv.16, are tapered correspondingly to the ‘angle of the
connection in which the support element C carries a
notch llpbutata slightly greater angle so that as the cam
surfaces 197 engage the cam surfaces 18, there is a wedging
action transversely of the shank 12 which prevents the
hollow pin or stud 13C having a shank 12C and enlarged
head 16C. The stud and’ its head and shank are gen
erally rectangular and the portion of the stud which goes
through the support member is received in a correspond
top of the shank 12from seating completely to the top of
the notch 11 as is indicated by the dotted line at 20
ingly rectangular hole in the support member to properly
orient the stud with respect thereto. The vertically en
inZFIG. 4. Simultaneously the axial inclination of the _
cammed . surfaces 18 and 19 with respect to the axis 15 larged or extended ends of the shank 12C determine the
of the studs 13 causes the ?ange 10 on the platform rim
spacing of the head from the opposed inner face. of the
to be squeezed into tight frictional supporting engagement
support member 3C. The side- edges of head 16C de- '
with the side of the support member 3. Desirably the
?ne upwardly converging transversely convex angled
transverse angle. of the cammed surfaces 18 outwardly
cams 19C that decrease in height toward their upper ends
from the plane’ of the inside of the ?ange 10 is slightly less 2.0 as appears most clearly in FIG. 15. ‘The angledcams
than the, corresponding angle of the beveled surfaces 19
19C are received in and coact with concave angled
so that there is a further wedging action as the more
grooves or cams 18C formed along the sides of a notch
sharply tapered axial bevel 19 attempts to enter into the
more broadly beveled surface 18.
in FIG. 13, the- cam grooves 18C taper or decrease in
With the foregoing hook and pin connection the plat
11C in the border ?ange 10C. Asappears most» clearly
25
depth upwardly along the border member.
form 1 and tread 2 with their hooked ?anges are merely
lowered downwardly over the pins or studs ‘on the sup
The lateral angle of divergence of the grooves 180
indicated at A in FIG. 12 is of the order of 3° while the
porting members and the weight of the supported plat
corresponding angle of divergence of the convex cams
form and tread immediately causes locking engagement
19C as indicated at B in FIG. 14 is desirably slightly
between the members. A light tap with .a hammer or a 30 greater and of the order of 4° so that there is a Wedging
weightapplied to the platform and step merely seats the
action as the earns 1.90 move upwardly into the grooves
18C.
connection more ?rmly and the tight frictional engagement
created by the interlocked cammed surfaces prevents dis
engagement of the connectionseven though an uneven
support on the ground might cause an upward disengaging
As appears most clearly in FIG. 11 the transverse angle
of the cam grooves 18C in the border'rim are slightly
narrower or at a lesser angle than the angle of the co
force in one part of the platform when. it is stepped on at
operating convex cams 19C on the stud head. This
another point. A sharp blow with a hammer on the under
causes a still fur-ther weighting action as the supported
side of the rim ?ange 10 serves to disengage the connec
elements of the platform are presseddotwnwardly onto
tions when ‘it is desired to disassemble the platform ‘and
the supporting elements thereof.
step. ' The individual parts of the platform and step can 4.0
In all forms of the step and platform and the release
be made ofrelatively heavy ‘and rigid stock because it is
alble connections therebetween, the beveled cam surfaces
unnecessary to handle allof the parts at one time during
‘assembly or disassembly of the platform.
FIGS. Sand 6 illustrate a modi?ed form of connection
on the supported and supponting members are formed
by a coining or stamping operation so that the relative
angles of the several parts can be easily controlled.‘ Fur~
in which ‘the border ?ange 19A is provided with a notch 45 ther the coining openation hardens the surfaces of the
. 11A, however, instead of being. beveled or cammed along
the sideedges of the notch a semi~circular conical cam
18A is formed around the upper apex of the notch 11A.
cams formed‘and makes them resistant to wear although
frictional wear is not a major consider-ration.
The coacting supportmember 3A carries a pin or stud
13A having a circular shank 12A and an enlarged circular
head 16A. The rear or inner surface of the head 16A
is tapered conically as at 19Aand the'cam formed by the
a supporting rim member and upright support members
disposed at the sides of said rim member, a releasable
surface 19A 'coacts with the surface 18A to force the
?ange 10A into tight engagement with the support 3A
and to support the rim above the shank 12A. The con
struction shown in FIGS. 5 and 6 has the advantage that
the studs 13A and their conical surf-aces 19A are com
pletely symmetrical and can be installed in any angularly
What is claimed as new is:
1. In a demo-untable platform having a ?at tread with
supporting connection between said members comp-rising
horizontally projecting studs on said supporting members
and coacting downwardly opening notches in the rim of
the tread member, said studs having hollow shanks-?xedly
riveted to their supporting member and having enlarged’
heads spaced from the supporting member, said members
with the notches therein being received between said
rotated positionin the support element 3A.
FIGS. 7, 7A and 8 illustrate a further modi?ed form
of, the releasable, connection embodying features of both
previous connections. The ?ange 10B of the rim element
‘6Bv de?nes an upwardly converging downwardly opening
heads and the sides of the members to which the studs
are connected, said shanks and said notches being rela~
tively tapered to facilitate entry of the shanks into the
notch 11B. The inner side of the ?ange 10B along both
edges?of the notch 11B is inclined both laterally and
heads and inclined axially with respect to said shanks,
other co‘acting vertically converging cam surfaces formed
axially with the, axial inclination being laterally outward
onthe surface of said notched member opposed to said
heads and inclined with respect to said shanksoppositely
to said-?rst cam surfaces, the angle of convergence of
ly frornlthe notch and axially away from the inner surface
of the ?ange 10B as at 18B. The support element 3B
notches, ?rst vertically converging ‘cam surfaces formed
on. laterally opposite sides of the inner surface of said
carries a hollow tubular pin or‘stud 13B having an en
said ?rst‘ cam surfaces being, of the order of 4°, the angle
larged circular head 163 on its inner end. The rear side 70 of. convergence of said other of said cam surfaces being
of the head-16B is cammed, or beveled axially and laterally
slightly greater than the convergence of said ?rst surfaces
outwardly as at 19B at approximately the same but’
by the order of 1°, said ?rst cam surfaces being inclined
slightly greater angle than the beveled surface 18B on the
laterally at anangle of the order of 4°, said other cam
surfaces being inclined laterally at an angle somewhat
vergingchordal relation along opposite sides of the shank 75 less than lateral angle of said ?rst cam surfacesby'the
border ?ange. The beveled surfaces 19B extend in con
5
8,043,396
6
order of 1°, said ?rst and second cam surfaces tapering
therewith, said studs having hollow shanks ?xedly riveted
longitudinally of their length, the length of said shank
being less than the thickness of said member with the
to said one member and having enlarged heads spaced
from said one member, the other of said memberswith
the notches therein being received between said heads and
notch therein whereby said cam surfaces hold said mem
bers laterally together without contact between the shank
and the base of said notch, and a hand rail support de
tachably secured to the side of said platform by bolts
passed through the hollow shanks of said studs.
the sides of the members to which the studs are con
nected, ?rst vertically converging cam surfaces formed on
laterally opposite sides of the inner surface of said beads
and inclined axially with respect to said shanks, other
coacting vertically converging cam surfaces formed on
the surface of said notched member opposed to said heads
and inclined with respect to said shanks oppositely to said
disposed at the sides of said rim member, a releasable
?rst cam surfaces, the length of said shank being less
supporting connection between said members comprising
than the thickness of said member with the notch therein
horizontally projecting studs on one of said members
whereby said cam surfaces hold said members together
and coacting notches in the other of said members en
gaged therewith, said studs having hollow shanks ?xedly 15 without contact between the shank 'and the base of said
notch, and a hand rail support detachably secured to the
riveted to their supporting member and having enlanged
side of said platform by bolts passed through the hollow
heads spaced from their supporting member, said mem
shanks of said studs. .
bers with the notches therein being received between said
5. In a demountable platform having a ?at tread with
heads and the sides of the members to which the studs
are connected, said shanks and said notches being rela 20 a supporting rim member and upright support members
disposed at the sides of said rim member, a‘releasable
tively tapered to facilitate entry of the shanks into the
supporting connection between said members comprising
notches, ?rst vertically converging cam surfaces formed
horizontally projecting studs on one of said members and
on laterally opposite sides of the inner surface of said
coacting notches in the other of said members engaged
heads and inclined axially with respect to said shanks,
other coactin-g vertically converging cam surfaces formed 25 therewith, said studs having hollow shanks ?xedly riveted
to said one member and having enlarged heads spaced
on the surface of said notched member opposed to said
from said one member, said member with the notches
heads and inclined with respect to said shanks oppo
therein, being received between said heads and the sides
sitely to said ?rst cam ‘surfaces, the angle of convergence
2. In a dernou-ntable platform having a ?at tread with
a supporting rim member‘ and upright support members
of the members to which the studs are connected, said
of said ?rst ‘cam surfaces being of the order of 4°, the
angle of convergence of said other of said cam surfaces 30 shanks and said notches being relatively tapered to facil
being slightly greater than the convergence of said ?rst
surfaces, said ?rst cam surfaces being inclined laterally,
itate entry of the shanks into the‘ notches, ?rst vertically
converging cam surfaces formed on laterally opposite
sides of the inner surface of said heads, other coacting
said other cam surfaces being inclined laterally at an
vertically converging cam surfaces formed on the surface
angle somewhat less than lateral angle of said ?rs-t cam
surfaces, said ?rst and second cam surfaces tapering lon 35 of said notched member opposed to said heads, the angle
of convergence of said other of said cam surfaces being
gitudinally of their length, the length of said shank being
slightly greater than the convergence of said ?rst surfaces,
less than the thickness of said member with the notch
the length of said shank being less than the thickness of
therein whereby said cam surfaces hold said members
said member with the notch therein whereby said cam
laterally together without contact between the shank
and the base of said notch, and a hand rail support de 40 surfaces hold said members laterally together without
contact between the shank and the base of said notch, and
tachably secured to the side of said platform by bolts
a hand rail support detachably secured to the side of said
passed through the hollow shanks of said studs.
platform by bolts passed through the hollow shanks of
3. In a demountable platform having a ?at tread with
said studs.
a supporting rim member and upright support members
6. A releasable supporting connection between a sup
disposed at the sides of said rim member, a releasable 45
supporting connection betweenv said members comprising
porting member and a supported member comprising
horizontally projecting studs on one of said members and
coacting notches in the other of said members engaged
horizontally projecting studs on ‘one of said members and
coacting notches in the other of said members engaged
therewith, said studs being hollow from end to end and
having hollow shanks ?xedly riveted to said one member
and having enlarged heads spaced from said one member,
said member with the notches therein being received be
tween said heads and the sides of the members to which
the studs are connected, said shanks and said notches
being relatively tapered to facilitate entry of the shanks
into the notches, ?rstvertically converging cam- surfaces
formed on laterally opposite sides of the inner surface
therewith, said studs having hollow shanks ?xedly riveted
to said one member and having enlarged heads spaced
from said one member, the other of ‘said members with
the notches therein being received between said heads and
the sides of the members to which the studs are con
nected, ?rst vertically converging cam surfaces formed on
laterally opposite sides of the inner surface of said heads
and inclined axially with respect to said shanks, other
coacting vertically converging cam surfaces formed on
of said heads, and other coacting vertically converging
the surface of said notched member opposed to said heads
cam surfaces formed on the surface of said notched mem
and inclined with respect to said shanks oppositely to said
?rst cam surfaces, the angle of convergence of said other 60 ber opposed to said heads, the length of said shank being
less than the thickness of said member with the notch
of said cam surfaces being ‘slightly greater than the con
therein whereby said cam surfaces hold said members
vergence of said ?rst surfaces, said ?rst and second cam
surfaces tapering longitudinally of their length, the length
laterally together without contact between the shank and
detachably secured to the side of said platform by bolts
passed through the hollow shanks of said studs.
and coacting downwardly opening notches in said sup
ported member, said studs being hollow from end to end
and having non-circular hollow shanks ?xedly riveted to
their supporting member and having enlarged heads
spaced from the supporting member, said members with
the notches therein being received between said heads and
the base of said notch.
of said shank being less than the thickness of said member
7. A releasable supporting connection between a sup
with the notch therein whereby said cam surfaces hold 65
porting member and a supported member comprising
said members together without contact between the
horizon-tally projecting studs on said supporting members
shank and the base of said notch, and a hand rail support
4. In a demountable platform having a ?at tread with
a supporting rim member and upright support members
disposed at the sides of said rim member, a releasable
supporting connection between said members comprising
horizontally projecting studs on one of said members and
the sides of the members to which the studs are connected,
coacting notches in the other of’ said members engaged 75 ?rst vertically converging cam surfaces formedon lat
3,043,896
7
8
erally opposite sides of the inner surface of said heads
and inclined axially with. respect to said shanks, and other
coacting vertically converging cam surfaces formed on the
surface of said notched member opposed to ‘said heads
surface formed on the‘ inner surface of said heads and
inclined axially with respect to said shanks, and another
‘and inclined with respect to said shanks oppositely to said
?rst cam surfaces, the angle of convergence of said other
of ‘said, cam surfaces being slightly greater than the con
vergence of said ?rstsurfaces, said ?rst cam surfaces be
the length of said shank being less than the thickness of
coacting semi-conical cam surface formed on the-surface
of said notched member around the apex of the notch
therein and opposed to said heads and inclined with re
spect to said shanks oppositely to said ?rst cam surface,
said member with the notch therein whereby said cam
ing inclined laterally, said other cam surfaces being in
surfaces hold said members laterally together without
clined laterally at an angle somewhat less than lateral 10 contact‘ between the shank and the base of said notch.
angle of said ?rst cam surfaces, the length of said shank
11. A releasable supporting connection between a sup
being less than the thickness of said member with the
porting member and a’ supported member comprising
notch therein whereby said cam surfaces hold said mem
horizontally projecting studs on one of said members and
bers laterally together without contact between the shank
coacting notches in the other of said members engaged
and the base of said notch.
15 therewith, said studs being hollow from end to end and
8.‘ A releasable supporting connection between a sup
having hollow shanks ?xedly riveted to said one member
porting member and supported member comprising hor
and having enlarged heads spaced from said one member,
izontally projecting studs on said supporting members
the other of said members. with the notches therein being
and coacting downwardly opening notches in said sup
received between said heads and the sides of the mem
ported member, said studs being hollow from end to end 20 bers to which the studs are connected, ?rst vertically con
and having non-circular hollow shanks ?xedly riveted to
verging cam surfaces formed on laterally opposite sides
their, supporting member and having enlarged heads
of the inner surface of said heads and inclined axially
spaced from the supporting member, said members with
with respect to said shanks and other coacting vertically
the, notches therein being received between said heads
converging cam surfaces formed on the surface of said
and the sides of the members to which the studs are con 25 notched member opposed to said heads and inclined with
nected, ?rst vertically converging cam surfaces formed
respect to said shanks oppositely to said ?rst cam surfaces,
on laterally opposite sides of the inner surface of said
the length of‘ said shank between the head and said one
heads and inclined axially with respect to said shanks,
member being less than the thickness of said member with
and other coacting vertically converging cam surfaces
the notch therein whereby said cam surfaces hold said
formed on the surface of said notched member opposed
members together without contact between the shank and
to said heads and inclined with respect to said shanks
the base of said notch.
oppositely to said ?rst cam surfaces, said ?rst cam sur
12. A releasable supporting connection between a sup
faces being inclined laterally, said other cam surfaces
porting member and a supported member comprising hori
being inclined laterally at an angle somewhat less than
zontally projecting studs on one of said members and co‘
lateral angle of said ?rst cam surfaces, the length of said
acting notches in the other of said members, said studs be
shank being less than the thickness of said member with
ing hollow from end to end and having hollow shanks ?x
the notch therein whereby said cam surfaces hold said
edly riveted to their supporting member and having en
members laterally together without contact between the
larged heads spaced from'the supporting member, said
shank and the base of said notch.
members with the notches therein being received between
9. A_ releasable supporting connection between a sup
said heads and the sides of the members to which the studs
porting member and a supported member comprising
are connected, =a ?rst conical cam surface formed on the
horizontally projecting studs on said supporting members
inner surface of said heads and inclined ‘axially with re_
and coactingdownwardly opening notches in said sup
spect to said shanks, and another coacting semi-conical
ported member, said studs being hollow fro-m end to end
cam surface formed on the surface of said notched mem
and having hollow shanks ?xedly riveted to their support
her around‘ the apex of the notch therein and opposed to
ing member and having enlarged heads spaced from the
said heads and inclined with respect to said shanks oppo
supporting member, said members with the notches there
sitely to said ?rst cam surface.
in being received ‘between said heads and the sides of the
13. A releasable supporting connection between a sup
members to which the studs are connected; said shanks
porting member and a supported member comprising hori
and said notches being relatively tapered to facilitate 50 zontally projecting studs on one of said members and
entry of the shanks into the notches, a ?rst conical cam
coacting notches in the other of said members engaged
surface formed on the inner surface of said heads and
therewith, said studs being hollow from end to end and
inclined axially with respect to‘said shanks, and another
having hollow shanks ?xedly riveted to said one member
coacting semi-conical cam surface formed on the surface
and having’ enlarged heads spaced from said one mem
of said notched member around the apex of the notch 55 ber, the other of said members with the notches ‘therein
therein and opposed to said heads and inclined with
being received between said heads and the sides of the
respect to said shanks oppositely to said ?rst cam surface,
members to which the studs are connected, ?rst vertically
said other cam surfaces being inclined laterally at an angle
converging cam surfaces formed on laterally opposite sides
somewhat less than lateral angle of said ?rst cam surface,
of the inner surface of said heads and inclined [axially and
the length of said shank being less than the thickness of 60 radially inwardly from said heads to said shanks, ‘and
said member with the notch therein whereby said cam
other coacting vertically converging cam surfaces formed
surfaces hold said members laterally together without
on the surface of said notched member opposed to said
contact between the shank and the base of said notch.
headsand inclined with respect to said shanks oppositely
10. ‘A releasable supporting connection between a sup
to said ?rst cam surfaces, the angle of convergence of
porting member and a supported member comprising 65 said other of said cam surfaces being slightly greater than
horizontally projecting studs on said supporting members
the convergence of said ?rst surfaces.
and coactingv downwardly opening notches in said sup—
14. A releasable supporting connection between a sup
ported member, said studs being hollow from end to end
porting member and a supported member comprising hori
and having hollow shanks ?xedly riveted to their support
zontally projecting studs on one of said members and
ing member and having enlarged heads spaced from the 70 coacting notches in the other of said members engaged
supporting member, said members with the notches there~
therewith, said studs being hollow from‘ end to end and‘
in being received between said heads and the sides of the
having v‘hollow shanks ?xedly riveted to said one member
members to which the studs are connected, said shanks
and having enlarged heads spaced from said one member,
and said notches being relatively tapered to facilitate
said member with the notches therein being received be
entry of vthe shanks into the notches, a ?rst conical cam 75 tween said heads and the sides of the members to which
3,043,396
10
9
1,081,639
1,772,668
2,091,378
2,448,817
2,688,504
the studs are connected, ?rst vertically converging cam
surfaces formed on laterally opposite sides of the inner
surface of said heads and inclined radially outwardly from
said shanks and axially toward said one member, and
other coacting vertically converging cam surfaces formed
on the surface of said notched member opposed to said
heads, the ‘angle of convergence of said other of said cam
surfaces being slightly greater than the convergence of
said ?rst surfaces.
References Cited in the ?le of this patent
475,164
591,960
1,074,919
Sprague _____________ __ May 17, 1892
Dyer _____________ ______ Oct. 19, 1897
15
Woeltfel ______________ __ Oct. 7, 1913
Kusterle _____________ __ Aug. 12, 1930
Simpson _____________ __ Aug. 31, 1937
2,755,115
2,801,895
2,859,057
McArthur ___________ __
Parker ______________ __
Koilman _____________ __
Gass ________________ __
Elsner ______________ _._
63,187
141,242
354,058
734,513
752,576
Germany ____________ __
Great Britain _________ __
Great Britain _________ __
Great Britain _________ __
Great Britain _________ __
Sept. 7,
Sept. 7,
July 17,
Aug. 6,
Nov. 4,
1948
1954
1956
1957
1958
July 7,
Apr. 15,
Aug. 6,
Aug. 3,
July 11,
1892
1920
1931
1955
1956
FOREIGN PATENTS
10
UNITED STATES PATENTS
Vail ________________ __ Dec. 16, 1913
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