close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2406306

код для вставки
Aug. 2o, 1946.
A.' R. MORRILL
SHOE SUPPORTING JACK
Filed Jan. 51, 1945 ,
2 sheets-sheet 2 `
5 É,am
,
„n,w
@75%
Patented Aug. 20, A1946
2,406,306
UNITED STATES" PATENT OFFICE>
2,406,306
SHOE SUPPORTING JACK
Alfred R. Morrill, Beverly, Mass., lassignor to
United Shoe Machinery Corporation, Fleming
ton, N. Je., a corporation of New Jersey
Application January 31, 1945, Serial No. 575,473
11 Claims. (Cl. 12-12'7)
2
1
The present invention relates to shoe/ support
ing jacks for use in the manufacture of shoes, and
more particularly to a novel and improved con
struction and arrangement of the mechanism for
heretofore employed, for forcing the shoe for
wardly against the toe rest and for tightening the
several cooperating parts to a like extent one
against the other while these parts remain freely
securing the several cooperating parts of the jack 5 movable with relation tothe jackfsupport, has
been found to have certain drawbacks. Expe
in the closed shoe supporting position of the jack
rience has shown that it is not always possible to
preparatory to and during the performance of
any manufacturing operation upon the jacked
seat the toe of the shoe firmly against the fixed
toegaugè, so that the heel slide occasionally slips
shoe.
The jack herein disclosed as embodying in a 10 or is displaced forwardly during the Vsubsequent
operation upon the shoe. As the toe and heel
assemblies of the jack are tightened one against
the other, the effect of such movement of the heel
support is to loosen both the heel and toe> assem
rill Patent No. 2,323,346, dated, July 6, 1943, for 15' blies of the jack, so that the shoe is insecurely
held and may even become unjacked wîthfat
a Machine for use in the manufacture of shoes,
tendant risk of injury to the shoe and to the shoe
comprising a shoe support which is secured to a
operating mechanism to which the shoe is being
rotatable jack spindle or frame, a toe rest verti
presented.
„
,
cally adjustable on the shoe support, a heel sup
It is the object of the present invention to pro-V
port movable toward and from the toe rest, a last
vide a novel and improved construction andar
pin and a last pin carrier pivotally mounted in
rangement of the jacking mechanism which will
the heel support for tilting movement to engage
provide for the free adjustment> of the several
the toe of the jacked shoe against the toe rest, toe
centering grips carried by the shoe support mov
jacking elements with respect to one another, and
able toward and from each other and arranged 25 will thereafter cause ` the jack tightening and
clamping mechanism to be locked securely in the'
to engage opposite sides of the toe portion of the
jacking position with relation to the jack support.
shoe, a jacking lever, and connections actuated
More specifically, it is an object ofthe inven
by the jacking lever for tilting theV last pin carrier,
tion to provide in a construction of this general
for moving the toe centering grips against the
type, fastening means for the heel slide _and last
shoe, and for advancing the heel support to and
ing pin tilting mechanism which is unaffected by
securing the shoe firmly in position on the jack.
any looseness which may subsequently develop
The shoe is initially located on the jack and a
between the shoe and ñXed toe gauge or inthe
corresponding adjustment of the several coop
gripping action of the toe centering grips, and
erating jacking elements engaging lthe shoe is
obtained by means of a fixed toe gauge against 35 will assist to maintain the jacked shoe securely
in its clamped position,
Y
.
which the shoe is brought prior to the actuation
of the-jacking lever. The jacking lever is now
With these and other objects in view as may
preferred form the several features of the pres
ent inventionis of the general type illustrated in
the Morrill Patent No. 2,331,130, dated October 5,
.1.943, for a Shoe supporting jack, and in the Mor
moved by the operator to secure the shoe in the
hereinafter appear, the several features of the
jacked position, and acts through an eccentric
invention consist in the devices. combinations and
pawl and ratchet connection having a tightening 40 arrangement of parts hereinafter described and
claimed, which together with the advantages to
action to draw together two slide elements, one
being the heel support which is forced forwardly,
be obtained thereby will be readily understood by
one skilled in the art from the following descrip
tion taken in connectiony with the accompanying
against the sides of the shoe toe. The slide ele 45 drawings, in which Fig. 1 is a view in elevation
ments referred to, are freely movable withrela
and partly in section of the shoe supporting por
tion to the shoe support on which they are mount
tion of the jack with a lasted shoe thereon and
ed, so that the positions of the heel support and
the parts in shoe clamping position; Fig. 2 is a
toe centering grips relative to one another and'to
sectional plan view taken on the line 2'--2 of Fig.
the jack support may be automatically estab'
3, to illustrate particularly the relation of the heel`
lished through engaging contact with the lasted
slide, its guideway and the mechanism controlled
by the jacking lever to secure the heel slide
The organization of the mechanism for clamp
against its ways; Fig. 3 is an enlarged sectional,
ing the lasted shoe on the jack including the con
view taken on the line 3-3 of Fig. 2, illustrating struction and arrangement of this mechanism, as 55 particularly the heel assembly of the jack, thev
and the other being an operating ratchet for thev
toe centering grips which are thus moved tightly
shoe.
Y
f
'
»
'
2,406,806
3.
jacking lever and toggle connection with the heel
48 on the bottom'face of
i the last pin carrier 4t.
carrier pin; Fig. 4 is a sectional view taken on
A leaf spring 49 secured to the actuating arm 44
Vthe line lI-li of Fig. 3, to illustrate particularly
vfor engagement against the base of the slotted
portion of the last pin carrier 40 tends to rock
the last pin carrier counterclockwise away from
the operation of the heel slide clamping device; '
Fig. 5 is a sectional View substantially similar to
the Ytoe rest andv to maintain the ratchet teeth
Y; Y Fig. 3, but on a smaller scale and with the jack
thereon engaged against the pawl 46.
Vin the open position; and Fig. 6 is a sectional
View taken on the line @-LG of Fig. V5, toillustrate
particularly the toe grips and their supporting
and operating means.
The jack illustrated in the drawings is of theV "
2,331,130 above referred to, and comprisesv gen
erally a jack support I0 which is rigidly secured `
to a rotatable jack frame'or spindle indicated.>
I2.
f
direction to tilt the last pin and carrier, the pawl
@6 is provided with projections 5t, 56 acting
. against avertically movable wedge 53 and a wedge
supporting surface 6G on the heel support slide
VIii' respectively. The wedge is connected through
`apin and slot .connection with one arm of a lever
‘62 lon the heel support, the other arm of which is
general type shown in the patent toY Morrill No.
>at
In order to actuate the pawl toward and from
the ratchet teeth and to move the pawl vin a
.
' connected by means of an actuating linkV @4 with
2m arm 65 0f the jacking lever 39. The actuating` '
arm> M' is urged yieldingly in a coiu'iterclockwisev Y.
so as to becapable of vertical movement only 20 direction away from theftoe rest by means of a
plunger 66 carried o-n the yheel support I5 and Y
heightwise VofA theY shoefand the heel support
Y The means lfor supporting the shoe on the jack
comprise a toe rest I4 and a heel support I6,` the
toe rest'beingr mounted on the jack frame ISÈÍ'
spring-pressed upwardly into engagement with a
'ï i beingjmovable toward andmfromlthe toe rest to
shoulder on the arm 44.
accommodate shoes of diiîerent sizes. Y To locate
the shoe in .a predetermined longitudinal posi
'
Adjustment of the Yposition of the toe Vrest I4 '
tion- on thee-jack.. a ñXed toe gauge I 3 is pro `25 vertically in accordance with the size of shoe being '
operated upon is determined automatically bythe
vided- consisting'of »a block secured to and eX# `
tending »upwardly-g from the forward end-'of tl e
position of the heel support. IS by means of a con- '
jack supportlß.
nectingV rod S8, the forward endof which is ar
ranged to slide between suitably shaped surfaces
¿
»
'
The ltoe portion Y,of the shoe~~is also located
and‘heldin proper VpositionV on tliegjack by means
30 on the jack support and the under side ofv the "
of 'toejgriprs’r or clamps, which toe grips are ar
' ranged «Y tov move toward andjfromi each other
shoe, theseveral
operating parts of the jack including the center-V
of theîshoe; Each toe grip consists of a sub- ï
ing toe grips 2Q, the heel support I6. the toe rest
ifi Yand the last pin carrier 4H] are tightened to
stantially Vvertically arranged plate 2t provided ï
f
VIn the operation of jacking the
andrto engage opposite sides `of >the toe portion
with a depending stud fitted to rotate `ina blockV
gether and locked in the tightened position by
22 Which'in turn is. pivotally mounted tc turn?
means of the manuallyr'operable jacking lever 3B.
In this operation, a lasted shoe is placed
onra horizontally arranged bearing> pinze on the l.
last pin and is. tilted forwardly and `down
Ü jack support Iii. Each plate 2d is acted‘upon by ;
a light; spring «2 5j whichptends" to» rotate the 'rear 40 operator againstthe toe rest I4, and is
longitudinally until the toe is brought
l ' end ofthe plate inwardly toward the shoe. » The "
l
toe-grips- 2-0 arearrangedto be lmo'ved together. `
Y and' are ~normally~ pressed inwardly by spring-- '
pressed plunger's 12B-»which lengage yieldingly
against. ou-twardlygextending abutments on the
on the
by the
moved
firmly
against the stationary toe gauge IS, this move- `
>ment. acting to bring Ythe several operatingparts
substantially to theircloeed or jacking position.
The> jacking lever 33 is now moved to its closed
formed in the under side' of the toe Vgrip controlv >
position so-Ythat the toggle connection provided
by the link 64 and the jacking lever 39 isv rendered
operative to raise the wedge d8, to engage the pawl
âëFwith the ratchet teeth on the last pin carrier
dû. to forcedownwardly and tc-lock the toe portion
of the shoe against the toe rest I4.'- At the- same
time the pawl 33 carried on the eccentric YYhub of
slide 32 is-arranged to'be» engaged by aV pawl 33
the jacking lever is moved rearwardly with rela- Y
blockst 22, «andf are further lprovided with rack
teeth :engaging a pinion shaft 3Q extending hori
Q zontally~across-thejack supportY IQ. ~ The pinion =¿
shaftf-Bßisxalso arranged to mesh with a'rack~
in altoe grip control slide tzmounted'in a. guide
wayj- 34 inthe -ja'Ck’suppQrt 16. YA ratchet V3S
,
tion thereto, thus drawing together -.the toe grip _ ~
carried on the eccentric hub of the jacking lever
39' mounted onV the .heel support I5. The jacking f , control Slide 32 and the heel support I6 to further
lever 39 and pawl 38 form part of the mechanism
for tighten-ingrthe jacked shoe in place,Y herein -
tighten the toe grips 20 against the sides'of thc
after more fully to 'be described.
The‘heel support I6 comprises a bifurcated slide
mounted- to move toward and from the toe rest in
guideways 4I formed on the nnder side and in
still more iirmly in the forward direction against>
the toe 'grips EI! and ñxed toe gauge I3. It will
be noted that all of these parts are freely movable
rearwardlyv projecting side krails forming part oi'
the< jack support Ill. Upon the >heel support'IS- is
" mounteda last pin carrier IIE) provided with an *Y
upwardly projecting last pin to 'enter the last Y.
pin holeA of a shoe last. >The lastrpin' carrier‘âäi:
Ísiittedintoa
end of theV heel support
vertical I5,
Slot>and
>formed
is mountedfupen
in the rear ’
a-«horizontal pin. ¿i2-> so as to- be capable ofra tilt
l' ing> movementA to press the toeY of a- shoe down-v
ï wardl-yy against the toe ßrest. The lower portion
of the last pin carrier 40 isk slotted to receiveanVA
actuating arm 44- which is' pivotally supported at
its upper -end upon the pin 421i The arm MI- car'- ‘
ice toe, and at the same time to force the shoe
withrelation to the jack Ysupport I0, and are
moved with relationto one another against the
shoe, which in turn is located only with reference `
to the toefgauge I3. The operation of the jacking
lever as` thus Vfar described and in accordance
with the illustration of the Morrill patents above
referred to, causes theY several operating parts
' to' be'tightenedonly with relation to one another"
against the shoe»-
Y
I
.
In accordance with Vthe present invention,v an
added locking or fastening'V means is provided .
which is rendered operative by'movement of theA
jacking lever 39'to its closedV orA jacking posi-V '
tion to secure thelieelV support directly' to theY
Y ries aïpawl 46€ for engagement with ratchet teeth 7.5 jack. support IIJ. VFurther in accordance with
I K
2,406,806,
5
6
to tighten said assemblies one against the other,
the invention, the additional locking means re
ferred to, isarranged to be rendered operativeI
only after the several cooperating parts, each
freely movable with respect to the> jack support
l0, have been tightened against the shoe. As
and thereafter to secure the heel support rigidly.
directly to the jack frame.
Y
,2. Aishoe supporting jack comprising a jack
frame, a stationary toe gauge on the frame, a
heel supporting and clamping assembly includ
shown in the drawings, the heel support or slide
IB is'formed with two slots 10 which extend
ing a guideway on the frame, a heel support
slidably mounted in the guideway for movement
in one direction to engage a shoe toe against
the toe gauge, a toe supporting assembly com
prising a pair of toe grips and a toe slide mov
able in a direction opposite from said direction
ot Amovementiof the heel slide to tighten the
toeV grips, means including a jacking lever mov
10 is cut away to provide an aperture 'I4 within
able to tighten said'heel support and slide one
which is mounted the jacking lever 39.` A pair
against the other relatively in opposite direc
of spring plates 16 mounted in the slots '.lß are
tions to tighten both said heel and toe assem
arranged with their ends projecting into the
blies, and means rendered operative by the
aperture 14, and these ends are bent inwardly
movement of said jacking lever to rigidly secure
to provide spring members which engage with
the knuckle provided by the bifurcated end of 20 the heel support directly to the jack frame.
A shoe supporting jack comprising a frame,
the heël tilting toggle lever 64 at the point of
a toe Vsupporting assembly including a toe gauge
its pivotal connection with the arm' 65 of the
mounted on the frame, toe grips arranged for
vjacking lever 39 when the jacking lever is moved
gripping engagement with opposite sides of the
to the jacking position illustrated in the several
ñgures of the drawings. As best shown in Figs. 25 shoe toe, a heel supporting and clamping assem
bly including a heel support carried by the frame
3 and 4, the knuckle end portion of the lever 64
movable to engage the yshoe toe against the toe
is rounded or cammed at 'I8 to facilitate the
gaugaand control means for tightening the jack
movement of the knuckle between the spring
along the greater portion of the length of the>
slide so that the outer edge portions of the slide
formed with guide surfaces for engagement
with the guideways 4| may be readily sprung
outwardly into locking engagement therewith.
A portion of the tongue 'l2 formed by thev slots
members 16.
to secure a shoe on the jack comprising a ratchet
As will be evident from an in
spection of the drawings, the ñnal increment 30 4and pawl mechanism for tightening the heel
support and .shoe against the toe gauge, and a
of movement of the jacking lever 39 to the jack
clamping device operative thereafter for rigidly 'Y
ing position> will cause the knuckle formed by
clamping the heel support in its tightened posi
the pivotalL connection of the lever 64 and arm
tion directly to the jack frame.
65 of jacking lever 39 to move between the
4è A shoe supporting jack comprising a frame,
spring plates 16,`forcing Athem outwardly and
a toe supporting assembly including atoe gauge
thus exerting a strong outward pressure upon
mounted on the frame, toe grips arranged for '
the two side walls of the heel support or slide
i6 which causes the slide to be jammed or locked
against movement on the guideways 4|, so that
the heel slide is firmly ñxed with relation to the
gripping engagement with opposite sides of the
shoe toe, a heel supporting and clamping assem
bly. including a heel support carried by the frame
movable to engage the shoe toe against the shoe
gauge, and control means for tightening the jack
jack support I0.
With the construction and arrangement of
the jack tightening and clamping mechanism Y
above described, it will readily be‘seen that a
positions, a ratchet and pawl mechanism actu
ated bymovement of the jacking lever for tight
ening .the-heel support and shoe against the toe
more secure clamping land holding of the jacked
shoe is obtained without any sacrifice in the
freedom with which the several parts _ ofV the
heel and toe assemblies of the jack `are per
mitted ’to adjust themselves in vclamping rela
to secure the shoe on the jack comprising a jack
ing lever‘movable between release and jacking
50
gauge, and a clamping device rendered operative
by the continued movement of the jacking lever
thereafter `for rigidly clamping ,the heel support
in the tightened position directly to the jack
tion to the lasted shoe. Any tendency of the
heel slide to be displaced forwardly as a result
frame.
`
of increased pressure vof the shoe toe against
5. A shoe supporting jack comprising a frame,
the toe gauge or of any undetected looseness in
a shoe supporting assembly including a toe gauge
the position of the toe grips is wholly obviated, 55 mounted on the frame, toe grips arranged for
and the risk that any appreciable loosening of Á gripping engagement with opposite sides of the
the heel and toe assemblies of the jack may take
shoe toe, a heel supporting and clamping assem
place isv correspondingly reduced.
The nature and scopeof the >invention having
been indicated, and an embodiment of the in
vention having been speoiñcally described, what
is claimed is:
i
bly including a guideway on the frame, a'heel
support slidably mounted in said guideway on
80 the frame for movement longitudinally of the
shoe toV engage the shoe toe against the toe gauge,
and control means for tightening the jack to se
1. A shoe supporting jack comprising a jack
cure the shoe on the jack comprising a jacking
frame, a toe supporting assembly including a
lever movable between release and jacking posi
toe gauge Vstationary on the frame, toe grips 65 tions, Ya ratchet and pawl mechanism rendered
engaging opposite sides of thefshoe toe, and a
operative by movement of the lever toward jack
slide carried onthe frame movable to tighten
ing position for moving the heel support on the
said grips, a heel supporting and clamp
guideway to tighten the shoev against the toe
ing assembly including a guideway on the frame,
gauge, and _a clamping device actuated by con
a heel support slide-bly mounted in the guideway 70 tinued movement of the jacking lever to the
to move in a direction opposite to the direction
jacking position for rigidly clamping the heel ,
of movement imparted to the slide to tighten
supporti directly to the guideway. '
the shoe against the toe gauge >and grips, and
6. A shoe supporting jack comprising a jack
means including a jacking lever actuable for
frame, a toe gauge stationary on the frame, a
relatively moving said heel support and slide 75 heel supporting and clamping assembly includ
2,406,306
Y
7 ,
porting and clamping assembly including toe
moving the heel support on thel guideway to tight-Í
en the shoe against the toeV gauge, and a clamp'
ing element associated with the jacking lever-Tar-v
grips and a member movable on the frame in a
direction opposed to thatV of said heelsupport to
tighten said- grips against the shoe, and tighten
ranged uponf'movement ofthe jacking lever to
the jacking Vposition to move vbetween and ñex
Y Yinfy means operablev when 'actuated to tighten
said heel support and member one "against the
other independently of saidframe, and thereafe
:ter to secure said heel support rigidly'fdirectly to
'
the
frame.
»-
~
`
"
8"
movable between release and jacking' positions',
tightening means rendered operative by Ymove
ment of the lever toward jacking position forV-`
ing a heel support movable on the frame to
tighten the shoe against the toe gauge, a toe sup
said slide elements against the guideway.
10
'
f- lo. 1A shoe supporting jack comprising a frame,v Y
a toe supporting assembly including agtoe'gauge
'
stationary' 0n thev frame, and toe grips arranged
7; A shoe supporting jack comprising a iframe,
for >gripping' engagement {With opposite sides of
the shoe toe, a heel supporting and clamping as
sembly including'a guideway on the iframev anda neel support slidably mounted in said’guide'
a stationary toe gauge mounted onthe frame, a
toe rest, a heel >support carried on theiframe
rnovablertoivarci and from the toe gauge and toe
rest lengthwise of a shoe supported on the jack,
Va last pin, fa last pin carrier mounted to tilt on
for movement longitudinally of the'shoe to
Vthe»Y heel support, toe centering grips movable to-Y
engage the shoe toe againstV the toe gauge, said
ward and from each other arranged _to engage and Y yheel support being slotted from one' end along:V
‘a substantial> portion‘of its length to'provide- a'
pair of iiexible' slide> elements @for engagement
within the guideway and with 'an aperture formed
grip opposite sides of the toe portion of a shoe', >a
member provided with a ratchet mounted on the ’
frame andconnected to move with the toe grips,
a Vjacking lever pivoted on the heel support Vfor
movement between release and locking pos1tions,
connections actuated by the jacking lever for
Y therebetween, a pair of spring members supported'
with relation 'to said ' slide elements y Within- said
aperturaand control means for tighteningztheV
jack to Asecure* the- shoe on Vthe jack comprising'v
‘tilting the last Vpin to press' the toe of rajlasted
a jacking'leve'r mountedon thefheel’support‘mov--y
able between release and jacking positions, tight-V
ening means ¿rendered operative by movement off Y
Vshoe'placed- on the jack against `the toe rest, a
= pawl cooperating with said ratchet and arranged
ï
beV actuated by the jacking lever for relative
, ly moving the member and neel support to tight-,
'
f the lever toward jacking position for moving ¿the
en the grips and to tighten the shoe against the
heel support on the guidevvay to' tighten the sho'e
-toe gauge and grips, and a locking Ydevice actu-v
againstthe toe gauge, and a >cla'mpingfelement j
ated by the jacking' lever-for securing the heelY
actuated by continued movement of ìtheja'cking r
support in the tightened shoe Vclamping position
lever to the jacking position to engagesaid spring
members in said aperture;` to force»> the flexible
i rigidly directly to the frame.
Y
Y
35
»Y ,
slide elements against the-guideway.~ f‘- , :
' 8. A shoe supporting jack comprising 'a 'framed
a stationary toe ,gauge mounted on the frame, a
. li. A'Ya shoe~„_supportin'gfjacke,comprising
stationary `toe ¿gauge jmountedï’onVV >the
a=
Vtoe rest, a heel support carried on the frame Y frame,
movable toward and from lthe toe gauge and the ' frame', a toe/rest, a guideway on the frame,fand
toerrest lengthwise of a shoe supported on the 40 a heel support slidable in the'guideway,andfbifure‘
Y
cated'along a substantial portion ofV its length-to
provide relativelyl flexible slidek elements for.y en-V
gagement with the guidewayj for -movement to-V
ward and from the-toe gauge and toe rest length'
vvise of a shoe supported on the jack, a lastpin,
jack, alast pin, alast pin carrier mountedv to tilt' on the heel support, toe> centering grips movable
' toward >and from >each other arranged to> engage
and grip opposite sides of the toe portion of ‘a
shoefa> member 'carried on the framefand'con- «
j nected to move with the toe grips, said heel sup-`
'K a »lastrpin carrierfmountedîto »tiltV Aon the»y heel
port and"memberfbeinggarranged for movement
relatively‘for tightening the heel, support and toe
slideftoe centering grips movable .tovvard‘and
from'each other arranged to engagefandgrip op-~
'posite'sides of the -toe portion cfa shoe,ia- mem-f
berrprovided With a ratchet mountedon the frame
grips- respectiveiy, a» jacking lever, means actu?
ated by the jacking lever` for tilting the'last, pin
and connected tomove with the toe grips, a'jack- fV
V>toïio'r'ess, Vthe toe >of a lastedshoe placed on the
jackagainst the toe rest,¿tightening means actu
ated `by the jacking lever for relatively moving," j
' the heel support and member to tighten the same
ing llever pivoted- on said bifrurcated heel support
for movement between release and locking posi
Y tions,~connections including an arm having a piv-g
Vone against theL other, ,and means actuated by
otal connection- with the jacking lever for tilting '
the jacking lever for securingv the heel'rsupport
the last pin to press the Ytoerof the lasted -shoe
placed Onrthe ja'ckv against the toel rest, 'a pavvlr
to the frame in the tightened position. '
9. A shoe supporting Vjack comprising afname,
cooperating With said ratchet Vandarranged îto'be
actuated Iby the jacking lever-for relatively-move
a toe'supporting assembly includinga toe Vgauge
stationary on theV frame, andtoe grips Yarranged
for gripping engagement With vopposite V‘sides of
ing ,the lever and heel support to tighten the grips4 "
theV shoe toe, a heel supportingandwclamping Yas- i
and grips, and a locking device comprising a pair
of spring armssupported with relation torsaid
and to VVtightenthe shoe against the toe gauge'
sembly including a YguidevvayÃon thev vfrarnefand
aheel support slidably mounted in said g'uideway . flexible slide elements and arranged to be actedYV
Yfor movement longitudinally of the shoe to engage p' upon by said pivotal Vcormection upon‘movement
the Yshoe toe against the toe gauge,V said heel'VY of _the jaokìn'g'leverrto the locking'position to,"
support being` slotted -from one end along a sub
'relatively flex said slide elements " against thev
stantial portion' of its length Vto providera pair
,Y Y
of iiexiblerslide elements'for,engagementvvithin Y
theguideway, andY control means for tightening
the jack to secure the shoe on the jack compris-fV
i ing a jackingVY lever carried on the' heel support
guídewayY for _securingthe heel supportvin thel
l tightened shoe clamping'position rigidly Vto the i
7oVV
`
¢
'Y
'
f
`
'
'
Y
Документ
Категория
Без категории
Просмотров
0
Размер файла
936 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа