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Патент USA US2404329

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July 16, 1946.
D_ A, WALLACE .
'
2,404,329
COUPLING UNIT
Filed April 8, 1944
s Sheets-Sheet 1 _
/2
INVENTOR.
J4 Vla’ /? Wallace.
July 16, 1946.
D. A. WALLACE
2,404,329
COUPLING UNIT
Filed April 8, 1944
6 Sheets-Sheet 2
INVENTOR.
?arz'ai /7. Wallace.
' BY/YM
?TTdKNEYS.
July416, 1946.
Q A, WALLACE
' > 2,404,329
COUPLING UNIT
Filed ‘April 8, 1944
e Sheets;Sheet 5
IN VEN TOR.
5.
“WMMWW
July 16, 1946.
D. A. WALLACE
2,404,329 '
COUPLING UNIT
Filed April 8, 1944
.2.
6 Sheets-Sheet 4
‘ “ INVENTOR.
.Zm/Z'J I7.‘ Wallace.
BY #W
.
July 16, .1946.
'
D. A. WALLACE
COUPLING
2,404,329
UNIT
‘
Filed Aprils; 1944
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INVENTOR.
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Patented July 16. 1946
2,404,329
UNITED ‘STATES PArENro
‘ 2,404,329 "
' COUPLING UNIT
David A. Wallace, Detroit, Mich., assignor' ‘to
.
Chrysler Corporation, Highland Park, Mich., a
j "
corporation of Delaware
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Application April 8, 1944, Serial No. 530,215
7 Claims. (01. 114-235)
1
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This invention relates to an improved coupling
apparatus.
More particularly, the invention pertains to
.
cated vertically with respect to each other and
the respective vessels as to advantageously trans
which may be used in towing or pushing one
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.2
post ?xture on a pair of vessels which 'areso lo
improvements in co-uplingvapparatus of the type
vessel or vehicle by another.
,
from variations in the respective loads carried
thereby and to provide a coupler and .coupling
~
mit either a pushing or towing force'from one
One of themain objects of the invention is to
provide an improved coupler in apparatus of this
character which is adapted to receive and clamp
ingly embrace a plain, cylindrical post-like ?x
vessel to the other while the post and coupling
unit are connected at any oneof a relatively wide
range of vertically spaced positions;
ture with a force which is increased by the tend
ency of .coupler and post to vibrate or shift rela
tive to each other.
_
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_ .
Additional objects of the invention aretdpro
vide coupling apparatus .which ‘may be applied
singly or in tandem betWeenIapair of vehicles or
vessels one of whichis to be towed or pushedby
theother and to provide couplers which may be '
7
Another object of the invention is to provide
a coupler in apparatus of this kind which has‘a 15 readily released and reset to accommodatean
self~closing action when engaged by-the post:
angular disposition of one vehicle or vessel rela
like ?xture it is adapted to receive and which
tive to the other for'facilitating maneuvering
may be manually conditioned to open in response
during parking and docking.
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M
to relative separatory movement of the coupler
Still further objects of thesinvention are to
20 provide a locking bar in a‘ coupling of this kind
‘A. further object of the invention is to provide
which, when in oneposition,serves to positively
and post. -
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relatively pivotally movable jaws in coupling ap
lock the jaws thereof against opening and which,
paratus of this kind which have a pivotal axis
when in a different position, serves to yieldably
so offsetv laterally with respect to the. central
plane of the space betweenthe jawslwhen the
latter are closed, as‘to provide a relatively wide
entrance for admission of the post when the
jaws are in their open position.
‘Another object of the invention is to provide
oppose unintended closing of such ‘jaws from an
open position; to provide coupling units of this
character which are adaptedto be arranged in
vertically aligned pairslfor ‘.coacting with‘ the
same post of an associated?xture; and to pro
vide interconnected jaw-locking ‘mechanism in
in a pivotally movable jaw of a coupler of this 30 an assembly of coupling units of this kind by.
character an extension which; projects into the
which the clampingjaws ‘of the respective ‘units
space between the jaws at a location spaced sub
can .be simultaneously locked and unlocked. ..
stantially from the ‘offset pivotal connection
Illustrative embodiments, of the invention are
thereof for engaging the post as theplatter is re.
ceived between the jaws in, order to move the ‘
pivotal jaw toward its closed position regardless
of the anglevof approach of’ the post and coupling.
'An additional object “of the invention is to .
provide in coupling apparatus of this kind a uni
versally pivotal mounting for the coupler jaw unit .
which accommodates both rocking‘and pitching
at relatively :widely, vertically spaced locations
corresponding ‘to the draft of a vessel when
I empty‘and‘under full load, respectively; to pro
vide a coupler unit which may be released, with
out uncoupling it from the post-like ?xture,v in
order to adjust the-coupler unit onlthe post for
changes in the‘ draft of one of the coupled vessels
V
H .
Fig. 4 is a fragmentary plan view, showing cou
A still further objectiof the invention is to .7
provide means in apparatus of this character for
kind which may be embraced by'the .coupler jaws
v '
.Fig. -2 is a view similar to Fig. l but showing
the jaws of the coupling unit-in open position.
Fig’. 3 is a fragmentary sidevelevational View of
pling apparatus embodying the invention ap
larly related axes respectively.
uncoupling operations, as well as that which oc
curs during towing or pushing operations.
Other objects of the invention are to provide
a post-like ?xture in coupling apparatus of this
thereofin closed position.
the coupling apparatus shown in Fig. 1.
movements of one of a pair of coupled vehicles
or vessels relative to the other and about angu
‘absorbing shock incident to both coupling‘ and
shown in the accompanying drawings; in which:
Fig. 1 is a plan viewofw a, coupling; apparatus
embodying the invention and showing thejaws
plied to a propelling and propelled device such
as a tug and barge ‘or vehicle andtrailer,
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Fig. 5 is a side elevational viewoof the assembly
shown in Fig. 4.
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Fig. 6_ is a fragmentary, vertical, sectional view
taken 191141111? 5.?“5 .of ‘Fig,- 4. ~ . 1
_ Fig. '7 is a fragmentary, vertical, sectional view
taken on line ‘1-1 of Fig-3, illustrating the rela
tive positions of the locking bar’ and associated‘
parts of the coupling ‘when the jaw elements
thereof are positively locked in closed position.
55 _ . Fig. 8 is a fragmentary perspective view of the
coupling shown in Fig. 1, j
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Fig. 9 is a View vsimilar to Fig; 7-but showing
the locking bar in position to accommodate initial
opjeniirlgofrthe jaws of thecouplinag
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with ,‘re'spectto vthat-of the other which result 69 Fig. l0 isaview similar toFigs. 1'? and -9'but
2,404,329
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the forward vertical wall 30 of theibarge. The
I showing the locking bar in position to yieldably
post 25 is preferably held in spaced relation from
the bow of thebarge in order to accommodate
oppose unintended closing of the jaws from their
v open position.
free access of the jaws to the post as well as rela
Fig. 11 is a fragmentary perspective view of the
locking bar and the jaw element of the coupling;v »tive movement of the jaws and post. The post
‘25 also preferably extends a substantial distance
with which it cooperates.
Fig. 12 is a fragmentary plan view illustrating‘. - ’ above and below the level of the deck 28 so as
to facilitate attachment of the coupling to the .
the manner, in which two vessels may be coupled
post at Various elevations as required by varia
together by a pair of laterally spaced coupling
members embodying the invention;
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10 tionsof the drafts of the vessels.
Fig. 13 is a fragmentary elevational ‘view illus
trating the manner in which two vesselsmay be
coupled together by a vpair of vertically aligned
coupling members embodying the invention.
In the drawings is illustrated an adaptation of
the improved coupling apparatus for coupling to
gether ‘of a pair of vessels, one of which serves
The axis for the p-ivotally mounted jaw I2 pro
vided by the pin I3 is laterally offset with respect
to, the central plane of the space between the ,
jaws when the latter are closed so as to provide
a relatively wide entrance for admission of the
post 25 when the jaws are in open position." The
pivoted jaw I2Hhas a substantially semi-cylindri
cal seat 3| which is formed in part by an exten
. sion 32, that projects into the space between the
nated by the numeral Ill, which includes a sta- _ jaws when the latter are open. The extension 32
has an inclined face 33. which is adapted to abut
tionary body I I’ having a jaw I I and a relatively
to impart propelling force to the other. The cou
pling comprises a head portion, generally desige
pivotally movablejaw I2 which is pivotally at
the post as the latter moves into the entrance be
tween the jaws. Engagement of the post 25 with
the extension 32 promotes rotation of the pivotal
7 is pivotally mounted at I4 on the outer end of
a bar I5 which is shiftably mounted in a cylin 25 ‘jaw I2 towards its closed position as the post 25
and coupling head portion I 0 approach each other
' drical casing ‘I6. The casing I5 is adapted to be
during coupling operation. With this construc
attached to the deck I‘! of a tug, barge, or other
tion, approaching movement of the post and cou
vessel by mounting brackets I3 and I9. The bar
pling head portion throughout a wide range of
I5 extends centrally of the casing is and is slid
ably supported at the rear end of the casing by 30 angles of approach results in automatic closing of
the jaws of- the coupling and ultimate disposition
a bearing I9’ mounted in an aperture formed in
of the post 25 in the semi-cylindrical seat‘ 3|.
an end wall 20 of the casing I6. Fixed on the
The pivotal jaw» member I2 has an outwardly
inner end of the bar I5 is a collar 2| having a
protruding segment 34 which is disposed about
periphery which slidably‘ engages the inner sur
face of the casing I6, thus supporting the inner 35 the axis of the pin I3 in a counter-clockwise direc
tion,‘ as viewed in Fig. 2, from the extension
end of the bar. A coil» spring 22 is biased between
tached thereto by a pin I3. The head portion I3
32. The segment 34 is receivable in a channel
35 disposed between upper and lower wall por
tions 36 provided on the stationary jaw member
. and thefront end Wall 24 of the casing. The 40 I I which serve to support the pin I3. A substan
tially vertically disposed locking bar 3'! is shift
springs 22 and 23 serve to yieldably oppose shift
ably mounted in registering passages 33 and 39
ing of, the bar I5 and the coupler head -I ll carried
' one side of the collar 2| and the reariend wall
20 of the casing and a similar coil spring 23 is
biased between the opposite side of the collar 2|
thereby in respectively opposite directions. ' These
springs may, as shown in Fig. 6, vary in length
so as-to accommodate different amounts of shift
ing-movement of the bars I5 in respectively op
' posite directions and they may also vary in rate
or stiifnessto meet required thrusts in such re
formed in the upper and lower wall portions 36,
respectively, of the stationary jaw member. ' As
illustrated in‘Figs. 7 to 11,v the locking bar 31
is adapted to cooperate with the pivotal jaw mem
ber I_2 in’ yieldably holding it in an open posi
tion and in positively looking it in a closed posi
tion. The lower end section of the locking bar
spective directions‘. .The bar I5 is so supported
by the foregoing structure as to accommodate os 50 31 is of less thickness than the upper end sec
tion thereof and there is provided at the junc
cillative movement of the bar about its longitudi
tionof these two sections a shoulder 38’ which,
nal axis as well as shifting thereof in the direc
as shown in Figs. 10 and 11, is adapted to rest
tion of this axis. Inasmuch as the rotativelaxis
upon the upper surface of the segment 34 in order
of the bar I5 is, as shown in- Figs. 1 and 2,»sub
stantially'normal to the pivotal axis of the head
I3 which is provided by the pin I4, the head por
tion Iii is thus free to pivot universally-in all
to yieldably hold the pivoted jaw I2 against un.-,
intended displacement from an open position by
embrace a purchase provided on a Vessel or ve
Fig. 7. As illustrated in Figs. 8 and 11, the upper
end section of the locking bar is tapered in width
vibration and other actions to which it is sub
jected.
directions as well as to shift bodily against the
The segment 34 is provided with a notch 40 '
actions of the springs 22 and 23. A spring I5’
having an intermediate portion coiled about ‘a 60 for receiving a portion of the upper section of
the locking bar 31 when the pivotal jaw I2 is
pin I6’ carried by an extension I'l' projecting
in closed position. The notch 40 has a shoulder
downwardly from the bar I5, has its opposite ends
4| at one end which is engageable with the side
' biased betweenrthe bar I5 and the head portion
surface 42 of the bar 31 for positively locking
It so as to normally yieldably retain'the latter
65 the jaw I2 against opening movement when the
in longitudinal alignment with the bar I5. '
locking bar is‘ in its lower position, as viewed in
The jaws H and I2 are adapted to clampingly
hicle such as a post 25 of a ?xture, generally des
from a maximum width at its upper end so as to
ignated at 26. A The ?xture 26 includes an upper
T bracket 21 which is adapted to be attached to. the 70 wedgingly engage between the shoulder!“ and
deck 28 of a vessel and a lower bracket 29 which
is preferably securable to an end wall of the Ves
sel. When applied to a barge, for example, the
bracket 29 may be attached to that portion of the
hull which is normally inclined vWith reslpectcto
awall'of each of the passages 33 and 39 through
which the bar extends, thus tending. to urge the
jaw ‘I2 toward a further closed position. This
taper'of the upper end of the locking bar also
accommodates closing the jaws into'gripping re-v
2,404,329
5
6
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lationship with respect to ?xtures or posts of dif
from longitudinal alignment bya cable. 51 have
ferent
ing its opposite‘ ends ?xed to one vessel at ‘lat
erally‘ spaced locations and having its interme-.
cross-sectional dimensions. .
.
.
.
A yieldable lining ‘material comprising,‘ :rub
ber, sponge rubber, leather or the like is?xed to
diate part coiled about a capstan. 58. The .ves
sels may be ?xed in angular relation by releasing
the coupling and turning the drum‘ of the capstan
_' the concaved side faces of the jaws VH and 12
which engage the post 25 for coacting irictionally
therewith. This yieldable lining material and the
to selectively . predetermine, the lengths of. the
wedging action of the locking bar 31‘ promotes
sections: of cable leading from the capstan.
working of the jaws into increasingly tighter grip
.A pair of vessels may be coupled together, as il
ping relation with’ respect to the post 25‘ as a 10 lustrated in Fig. 12, with the aid of two laterally
result of relative turning of -the couplingand
spaced couplings. In this use of couplingga'ppa
post about the-axis of the-latter-due to vibration
ratus embodying the invention, a cable 59 may be
and‘ relative movements of ‘the vessels or vehicles
?xed at its opposite end,,as ‘shown in :Figs..~4 and
5,4t'olaterally spaced locations on one vessel and
The lockingbar-3‘I- is normally urged down 15 looped over a spring pressed pulley, ' generally
wardly by- its own weightand by'the gravity ac
designated by the numeral 60, mounted on the
tioneof a control lever 43 which-is pivotedat 44
other vessel. The cable is thus tensionedv and
to a‘ bracket45 extending upwardly'fro'm the head
serves to-prevent complete separation of the v._e's-,
portion- Illof the coupling. The lever 43has .an'i ' sels during maneuvering. The vessels may .zbe
arm 46 pivotally connected at 41- to the upper end 20 connected by only either one/of the coupling units
of ~ the locking bar. ‘Pivotalmovement'off the
when it is desired to dispose them in angular re-_
lever 43in a counter-clockwise direction about
lation for purposes of docking and maneuvering.
the pivot 44, as viewed in Fig. 5, liftsthe bar
In Fig. 13, is illustrated the employment of ver
from the position» shown in Fig. 7 to the position
tically ‘aligned couplings of the character shown
shown in Fig. 9. vLatch mechanism, generally 25 in Figs. 1 to 1-2 for connecti'onwith thesame post.
designated by the numeral 48, is provided in
The locking bars 31 of each of the couplings
order that the lever 43 'may be released after
shown in Fig. 13 are connected together by a link
the-locking bar 31 israised to its upper position
6| so as to be simultaneously operated by manip
without permitting ‘the latter ‘to’ return to its
ulation of the lever 43 of‘the upper coupling,‘the '
lower -position.- This mechanism includesa latch 30 corresponding control lever of the lower coupling
member 49 pivoted-on a-pin-50 mountedin ears
being omitted.
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5I-which protrude-from the body portion I0 of
The improved coupling apparatus is pivotally .
the coupling. The latch member 49 has a pointed
as well as shiftably ?exible andespecially well
connectedtherebyv
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edge portion 52 whiohis adapted to engage in a .
suited for withstanding shock, vibration, thrust
notch 53 formed in ‘the side of the locking bar 35 and all of the various forces to which a device of
31 opposite from the segment 34. The latch memthis kind issubjected by towing as well as wave
ber 49 is biased by its weight in a clockwise di
' actions. The jaws may be preset in widely spaced
rection about the-axis of the pin 50 and readily
open relationship to facilitate‘ entry of a post‘ or
engages in the notch 53 when ‘the latter isY-raised
other purchase portion of ‘a .?xture therebetween.
into
registration
with it.
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>When the‘ lock-bar Blis thus held in- its upper
. position, the pivoted jaw member is free- to‘be
opened manually or in’ response to separatory
40
Closing of thejaws is entirely automatically pro
duced by movement of the post into position to‘
be gripped by the jaws. The vw'edging action of
‘ the locking bar ‘assures ?rm gripping of the post
movement of: the coupling member and post. ' by ‘the jaws and the yieldable frictional. lining of
During opening movement of the pivoted jaw 45 thejaws assists in the attainment of an increased
member I2- a lug 54- which projects upwardly
from the ‘segment 34,‘1 at a location spaced from
the shoulder 4|, engages a» ?nger 55 on thelatch
member 49. The~lug154 has-‘an inclined-side, 55
gripping action; The locking bar can be preset in
its released position to facilitate uncoupling of
the unit in response to relative sep-aratory move
. ment of the vessels; Full opening of the jaws
whichv cams the latch member 49~in a counter so brings the locking bar into positionto yieldably
clockwise direction aboutitslpivo'tal» axis; as illus
oppose unintended closing of the jawsand into’
trated in Fig.- 10, until the edge~52 thereof be
readiness for its next locking action.
‘
p
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comes disengaged from thelnotch 53. The lock
Coupling apparatus embodying the invention
ing bar 31 is then permitted.- to descend until the
may be employed to releasably'couple together
shoulder» 3850f the locking bar rests upon the 68 vehicles and other objects, as well as vessels.x ,
upper surface portion of the segment 34 which
Although but several speci?c embodiments of
is located between the lug 54 andthe end‘w‘all
the invention are herein shown and described, it
4| of the notch 40.’ The weightof the locking
will be understood that various changes in the
barthus applied on the segment 34 yieldably op
sequence of operations, steps and materials em
poses unintended closing of the jaw l2. Opening
ployed may be made without departing from ‘the.
of the jaw l2 islimited byengagement of an
spirit of the invention.
.
upstanding flange 55 on thejaw l2 with a stop
I claim:
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.
65 protruding from the ear 36, as shown in Fig.
1. Apparatus for coupling one body to another
2. When the jaw is subsequently closed, as here
, body having a member thereon providing a pur
tofore setforth, the accompanying rotation of 65 chase comprising a clamping member including
the segment brings the notch 40 into registration
a pair of relatively movable jaws having, clamp
with the bar 31 which drops into the notch 40,
ing ends between which said purchase is receiv-.
thus positively locking the jaw 12 against open
able, 3, yieldable lining material on at least ‘one
of the internal surfaces of said jaws having an‘
Two vessels may be coupled together, as illus 70 extensive surface area for frictionally contacting
trated in Figs. 4 and 75, by a single coupling em
with said purchase,.one of said jaws having a
bodying the‘invention. The coupling unit and
passageway therein and the other having an abut
post are preferably located in the longitudinal
ment .registerable with .said' passageway, ‘and
ing.
>
I
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central plane pi.’ the vessels which may be re
means ,for releasably locking said jaws‘in ‘closed
leasably held against unintended displacement 75 embracing relationship with respect to said pur
2,404,329
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ment with said shoulder. a latch element for re
' chase, comprising a wedge member ,shiftably
leasably holding said , locking bar in said last
mentioned-position, and means on one of said jaw
elements engageable with said latch elementfor
releasing the same to accommodate movement of
said wedge portion into registration with said
‘mounted in said recess and having opposite di
verging sides' directly engageable', respectively,
with said abutment and a wall of said passage
way, ‘said wedge member ‘being adapted to shift
in response to relative movement of said jaws
when ‘the latter are in closed position vIfor increas
shoulder during initial relativeclosing movement
of said jaw elements; '
,
ing the grippingi action thereof upon said p'ur-é
a 5..’ Coupling apparatus comprising a support, a
chase. and. for 'retaining‘said yieldable material
under compression between said jaws and said 1,0 pair of clamping units mounted on said support
‘in spaced relationship-,7 each including a pair of
relatively movable jaw elements having clamp
ingsjend portions formed to-embracingly partially
jaw elements each having a clamping end por
surround an object and having’ opposite overlap
tion ‘adapted to embrace an object, sheet-like
ping end portions, ,a pivot connecting said jaw 7’
15'
yieldable lining material on the internal surfaces
elements; at a location intermediate said end ‘por
of said clamping end portions having a substan
purchase;
3J2.
'
coupling comprising relatively movable
tially extensive surface area adapted to friction- ' '
tions,- one; of ‘said jawv elements‘ of each unit hav
ing a slot therein located on the side‘ of said pivot
opposite fromvits clamping end ‘portion, and the
a tapered portion adapted to cooperate with op 20 other'having a shoulder registerable ‘with said
slot when said jaw elements are in closed position,
posed surfaces on each ‘of said jaw elements for
mechanism for releasably locking each of said
opposing opening movement thereof from a closed
clamping units, in closed position comprising a
position, said locking, bar being s'hi'ftable during
locking
bar shiftably mounted in each of,‘ said slots
vibratory movement of said jaw elements relative
ally engage said object, and a releasable locking
bar shiftably mounted on said coupling having '
to each other when closed for opposing. opening 25 having an abutment engageable with the asso
ciated‘ shoulder respectively and a‘ member inter
thereof from progressively more closed positions
and for progressively‘increasing'compression of
said yieldable material between said object and
connecting saidlocking bars, and an operating
member connected with one of said locking bars
and adapted to shift both of said locking bars for
3. A coupling comprising relatively movable 30 bringing said abutments out of alignment with
said shoulders in order to simultaneously vaccom
jaw elements having clamping end portions
modate opening of ‘both of said clamping units.
formed to embracingly partially surround an ob
6. Coupling apparatus comprising a support, a
ject and having opposite overlapping end por
pair of clamping units mounted on said support
tions, sheet-like yieldable frictional lining mate“
in vertically spaced relationship, each including
rial on the internal sides of said clamping end 35
saidclamping end portions'
,
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portions, having a substantially ‘extensive fric
tional surface area, a pivot connecting said jaw -
a pair of relatively movable jaw elements,’ a mem
ber shiftably mounted on each of said units for
releasabiy locking the clamping jaw elements‘
elements ‘at a location intermediate said end por
thereof in closed position, means for intercom-7
tions, one of said overlappin'gend portions hav
ing a slot therein located on the side of said pivot 40 necting said members, and an operating lever
~oppos‘1te’ from its clamping end portion, and the » connected with one of said members forsimul
other of said superimposed end portionslhaving
a shoulder registerable with said slot, and a lock
taneously shifting said members to their jaw ele
ment releasing positions.
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ing bar shiftab-ly mounted in said slot havinga 45 7 . _A coupling comprising relatively movable jaw '
elements having clamping end portions formed to
wedge-shaped portion engageable with said shoul
embracinglypartially surround an object and hav
Her and an end of said slot for progressively wedg
ing opposite overlapping end portions, a pivot
ing said overlapping end portions apart and said
connecting said jaw elements at a location inter
clamping, end portions together into ?rm gripping
mediatesaid
end portions, one of said overlapping
engagement with said object during slight rela 50
end portions having a slot therein located on the '
' t-ivemovements of said jaw elements.
'
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sidejof said pivot opposite from its clamping :end
e. A coupling comprising relatively movable
portion, and the other of said superimposed end
jaw I elements having clamping end portions
portions having a shoulder registerable with said
formed to embracingly partially surround an ob
slotLa locking bar shiftably mounted in said slot
jectzand having opposite overlapping end por 55 having
a wedge-shaped portion engageable with
tions, yieldable frictional lining material on the
internal sides of said clamping end portions, a
pivot connecting said jaw elements at a location
intermediate said end portions, one of said over
said’ shoulder and an end of saidslot for progres
sively wedging said overlapping end portions
apart and said clamping end portions together
into firm gripping engagement with said object
lapping end portions having a slot therein located
on the side of said pivot opposite from its clamp 60 during slight relative movements of said jaw ele-V
ments, said locking bar having a reduced end
ing end portion, and the other of said superim
portionladapted
when aligned with said shoulder
posed end portions having a shoulder registerable
to accommodate opening of said jaw elements,
with said slot, a locking bar shiftably mounted in
said slot having a wedge-shaped portion engage 65 means for shifting said’locking bar to bring said
reduced end portion thereof into alignment with
able with said shoulder and an end of said slot
said shoulder, a latch element for releasably
for progressively wedging ‘said overlapping end
holding said locking bar in said last mentioned
portions apart and said clamping end portions to—
position, and means on one of said jaw’elements
gether into ?rm gripping engagement with said
object during slight relative movements of said 70 engageable with said latch element for releasing
the same to accommodate movement of said
jaw elements, said locking bar having :a reduced
wedge portion into registration with said shoulder
end portion adapted when aligned‘ with said
during initial relative closing movement of said
shoulder to accommodate opening of said jaw
elements, means for shifting said locking bar ‘to
r
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DAVID A_. WALLACE.
hringlsaid reduced end portion thereof into align
jaw
elements.
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