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Патент USA US2117015

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, May 10, 1938.‘
'
"H. c. BRISTOLL Er AL
2,117,015
STRAP STRETCHING TOOL
Filed June 25, 1936
2 Sheets-Sheet l
H4RP/S0N GER/57791.1,
,
ROBERT VSANFORD
as‘, HOWARD C.’ DOOLITTLE'
May 10, 1938.
H. ¢_ Bms-roLL ET AL _
2,117,015
STRAP STRETCHING TOOL
Filed June 25, 1936
2 Sheets-Sheet 2
Fig.4
60
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MPH/JON 6.‘ BRISTOLL
ROBERT VJANFORD
HQWARD G170 LITTLE
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’
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WM
Patented May 10,
2,117,015
UNITED STATES PATENT OFFICE
2,117,015
srmr sranrcmnc} TQOL
Harrison 0. Bristoil, New Britain, Robert V. San
ford, Hartford, and Howard C. Doolittle, New
Britain, Conn., assignors to The Stanley Works,
New Britain, Court, a corporation of Connecti
ciit
"Application June 25, 1936, Serial No. 87,144
,
,
.
12 Claims.
This invention relates to a device for stretch
ing straps or bands’ about packages, boxes, or
other articles.
,
The aim of the invention is to provide a more
‘5 simple and effective strap stretching tool which
is relatively light in 'weight, may be easily han
died, and conveniently operated; which is very
((1254-46)
‘
erally aligned longitudinally of the tool, but in
clined ‘upwardly and rearwardly as later described. A strap lock in ‘the form of a dog It
cooperating with a laterally extending lug I5 is
carried by the frame for the purpose of securing
one end of a. strap I0 to‘the frame;
The frame
has a longitudinal bore extending‘ axially through
simple and compact in construction, and capable
the handle and slidably accommodating a rack
of being constructed at low cost; and which is
bar I 6, the forward end of which ,is provided
10 strong and durable.
‘
t
A further aim of the invention is to provide a
tool of this character with an improved arrange
ment whereby the overlapping strap ends may be
held during the tensioning operation a sufficient
15 distance away from the package being strapped
to permit of the positioning of the seal on the
strap ends and accommodating the jaws of a
sealing instrumentality during the sealing opera
with a head I‘! having a foot [8 with which ~co 10
operates a strap lock in the form of a dog I9 for
securing the other end of the strap to' the head.
An operating hand lever 20, pivotally connected
to the body through a shaft 2i extending trans
versely through the frame, is ratchet connected 15
to the rack bar so that when the hand lever is
operated, the rack bar is axially moved and the
frame and head move relatively away from each
‘ tion, this arrangement being of particular ad
other to pull the respective forwardly and rear
20 vantage when applying the straps to rounded wardly projecting strap ends ‘Illa and lllb in op 20
surfaces.
posite directions and tension strap l0 about an
Other objects will be in part obvious and in article being handed. A supporting foot 22 is
part pointed out more in detail hereinafter.
located beneath frame I 2 substantially in the
Our invention accordingly consists in the fea
plane of foot i8 to aid in supporting the tool
25 tures of construction, combination of elements, ' when employed on a flat surface. As shown in
, and arrangement of parts which will be exempli
Fig. 1, foot 22 is so positioned with reference to
?ed in the ‘construction hereinafter set forth and foot i8 that the tool may be supported at a slight
the scope of the application which will be indi
angle whereby an operator will have ample room
cated in the appended claims.
for his ?ngers between the handle and the article
In the accompanying drawings illustrating one being banded.
30
30
embodiment of our invention and wherein like
. The operative connection between lever 20 and
parts are indicated by like numerals:
the rack bar It includes a pinion 23 journalled
Figure 1 is 'a side elevation of our invention on shaft 2| and meshing with the teeth of the
showing its application to tensioning a strap rack bar. ‘ As shown in Fig. 1, the teeth on the
35 around a box or similar object having a ?at face;
rack bar terminate in spaced relation to the ends 35
Fig. 2 is an enlarged fragmentary sectional view of the bar, thereby limiting the maximum extent '
illustrating the ratchet feed mechanism associ
of rack bar movement in both directions. Car
ated with the tensioning device;
ried by lever 20 adjacent to pinion 2| is a driving
Fig. 3 is an enlarged fragmentary plan view pawl 24 pivotally mounted on a transverse pin 25
40 showing the forward clamping mechanism and supported in a forked portion of the forward end 40
the strap supporting means associated therewith; of the lever and spring pressed into driving en
Fig. 4 is a view taken substantially along the gagement as shown. The nose of pawl 24 is so
lines H of Fig. 3 and showing a transverse arranged that when the lever is angularly moved,
section through the forward clamping mecha
in one direction, rearwardly and downwardly in
the present instance, the pinion is rotated (clock 45
45 nism;
Fig. 5 is a view taken substantially along the wise in Fig. 2) to move the rack bar outwardly
lines 5—-5 of Fig. 3 and showing a longitudinal from frame l2, and when the lever is swung in
section through the forward strap supporting the opposite direction (upwardly and forwardly)
members and associated parts; and
during an inoperative stroke, pawl 24 will ratchet
50
Fig. 6 is a fragmentary .view of our invention
or slide over the pinion teeth without remaining 50
illustrating its application to tensioning a strap
in driving engagement therewith.
about an article having a rounded contour.
For the purpose of preventing retrograde move
ment of the rack during the inoperative stroke
of the lever and to lock the rack against move
In accordance with our invention, we have pro
' vided a strap stretching too] including a frame
55 i2 having a rearwardly extending handle I3 gen
ment into the frame during a strap tensioning 55
2
2,117,015
provided. These pawls are pivotally supported
of its angular movement therein. The upper
curved face 42 cooperates with bore 48 and in
on a transverse pin 28 supported by the frame
and are spring pressed into engagement with the
effect forms a continuation thereof, so that a
relatively long bearing is provided for the front
operation, a pair of holding pawls 26 and 21 are
strap lock, it being observed, particularly from
Fig. 4. that the end of the shank from which the
arm 31 depends is backed up by the surface 42.
Depending arm 31 projects forwardly and in
angular relation to a vertical plane including the
pinion teeth. These holding pawls are provided
with noses arranged to prevent counter-clockwise
rotation of pinion 23 (with rei'ercnce'to Fig. 2)
so that when the pinion is rotated in a clockwise
direction by lever 28 and pawl 24. the pawls 26
10 and 21 will'ratchet over the pinion teeth.
As
shown in Fig. 2, the noses of pawls 26 and 21 are
preferably offset slightly from_ each other to mini
mize any retrograde rack movement during a ten
sioning operation.
.
-
axis of shank 36 so that a slight counterclockwise 10.
movement of dog IS, with reference to Fig. 1, will
tend to move the teeth thereon into strap gripping
.position and towards the upper face of foot 13. A
spring 43 within recess 41 and compressively re
ceived between head l1‘ and arm 31 tends to main
. After the overlapped strap ends are, sealed to
gether. it is desirable to quickly remove the pawls ' tain dog F9 in a strap grippingposition.
from operative pinion engagement so that the
rack may be retracted into. the frame to any de
sired position. To accomplish this, the upper
ends of the driving and holding pawls terminate
20
in the respective ears 24'. 26C and 21' which are
so positioned with relation to each other that
whenever hand lever 20 is shifted to the full
extent ‘of .its inoperative movement. these ears
25 will engage, causing all of the pawls to pivotally
- swing out of pinion engagement. At this time,
the pinion is free to rotate, and the rack l6 and
head 11 may be manually positioned wherever
desired with respect to the frame.
30
Referring now to the strap locks, dog 14, which
is journalled at its upper end on a projecting por
is
»
It is noted that the ?ange 33 is relatively broad
in the direction of the length‘of the tool and is
relatively thin in vertical direction, this arrange- '
ment being-oi’ advantage in that the ?ange is
strong enough to take the strains exerted thereon,
while at the same time the. overlapping strap ends
forwardly of the head are closely adjacentto each
other, thus allowing a seal to be readily placed
thereabout._ During the operation of tightening
the strap, there is a tendency for the tool to swing
or pivot forwardly and upwardly about the "for
ward edge of the head l1, and in order to pre
vent this, we provide, on the head and rearwardly
of the ?ange and at a plane somewhat above the
upper surface of the ?ange, a lug 44. The over
tion of pin 28, is provided with a serrated bottom lying strap end is required to pass beneath this
face forming a multiplicity of closely spaced teeth 31118
Dog I9 is prevented from axial movement in
which are urged towards strap supporting foot i5
by a spring 38 compressively received between the one direction by the engagement of the arm 31
dog l4 and the frame. The upper end of the dog against the side of the head. and in the other
terminates in a parti-cylindrical surface coaxial direction by means of opposed shoulders 48' and
with pin 28 and located beneath an overhanging 41, respectively, on the reduced end 33 of the rack
?ange 32 laterally projecting from the frame. bar and .on shank 36. The shoulder 41 on the
shank is provided by a groove 46 cut transversely 40
The underside of the ?ange has a curved face co
axial with pin 28 and engaging with the upper within the lower side of the periphery of shank
end of dog 14 to offer a support therefor inde
pendent of pin 28. Dog 14 extends somewhat
rearwardly and in angular relation to a vertical
45 plane including the axis of pin 28 so that when
ever the strap end l0b is inserted between the dog
and foot IS, a tensioning pull on the strap end
towards head i1 will aid in more firmly clamping
the strap in position. The strap end iiib may be
50 easily prelocated or disengaged by pulling it to
wards the handle end of the frame whereupon
dog l4 may be swung out of operative position.
The forward strap lock is pivotally supported
within the head, I1 which in turn is held on a
55 reduced portion 33 at the forward end of the
rack bar by means of a screw 34. A shoulder 35
at the rearward end of head [1 engages the ?at
top face of the rack bar to prevent relative angu
lar movement between the head and bar. The
60 forward strap lock is made in the form of an
integral clamping dog l9 having a relatively long,
laterally extending, cylindrical shank 36 from one
36 and intermediate of its ends. This groove has
a curved contour adapted to loosely overlie the
top peripheral face of reduced portion 33 on the
end of the rack bar and terminates at its left 45
hand end in the substantially vertical shoulder 41,
as shown in Fig. 4. Shoulder 41 engages the verti
cal shoulder 48' formed by recessing or stepping
the top of reduced portion 33, as at 43. '
It will be noted that the two strap locks are 50
so positioned with relation to each other that
the forwardly extending strap end Illa may be
inserted between ?ange 38 and foot i3 so that
a considerable extent thereof projects forwardly
of head 11, and the rearwardly projecting end 55
llib of strap l0 may be located in superimposed
substantially aligned relation to end Illa and ex
tend over flange 38 beneath the lug 44 and thence
between dog l4 and foot 15. vAn operative move
ment of the handle 20 at this timewill tend to
move the strap locks relatively away from each
other and tension the strap ends about the article
being banded. Due to the fact that dog I!
end of which depends an arm 31 terminating at
its lower end in a laterally projecting flange 38 ' angularly extends forwardly and dog l4 angularly 55
extendsrearwardly, the tensioning operation will
.65 having a serrated bottom face providing a multi
plicity of strap engaging teeth adjacent the upper tend to cause said dogs to more firmly clamp
into strap gripping engagement and thereby pre
face of foot l8. Head i1 is provided with a rela
tively long, transverse bore 40 within which the
shank 36 is journalled, and the right-hand end
70 of said bore (Figs. 1, 3, and 4) terminates in a
recess 4| somewhat triangularly shaped in vertical
section and having a bottom face merging with
the top of foot l8 and an upper curved face 42
coextensive with bore 40. This recess receives
75 depending arm 31 and is of such size as to permit
vent tendency of strap slippage. As shown in
Fig. 1 which illustrates the application of our
tool to tension a strap around an article. such 70
as a box having a ?at upper face, the forwardly
projecting strap end Ilia normally passes beneath
foot 22, but it will be appreciated that our device
may be operated with said strap end passing
over foot 22 if desired.
9,117,015
Our dc. vice is also constructed in such manner
that it may also be easily applied to stretching
the strap member In about articles of any shape
and particularly about a bundle of merchandise
having a curved outer surface, such as the bale
A shown in Fig. 6. To accomplish this, the left
hand side of head ll (Fig. 4) is provided with
a laterally projecting cylindrical boss ill con
centric with bore 40 and having a strap support~
ing member 5| journalled thereon for pivotal
movement. The strap supporting member may
comprise a longitudinally extending arm 52 jour
nailed at one end on boss 50 and having a laterally
projecting arm 53 at its outer end adapted to
15 underlie the overlapped strap ends when desired.
Arm 53 is preferably provided with a rounded
upper face soas to provide a line contact between
the arm and lower strap end and thus facilitate
stripping of the tool from the package after the
20 stretching and sealing operations have been com
3,
foot and frame and adapted to pull the over
lapped ends of a binding strap in opposite di
rections to tension the strap about an article,
and a member pivotally connected to the foot,
said member having a laterally extending strap
supporting portion located in spaced relation to
the foot and cooperating therewith to support
the overlapped strap ends in position for con
venient application of a sealing tool.
3. In a strap stretching device for tensioning
a strap about an article, a frame, a strap sup-v
porting foot movably associated with ‘the frame,
gripping means associated with the frame and
the foot and arranged to respectively clamp the
‘opposite ends of a flat metal binding strap in
superimposed relation, means causing .a relative
movement of said foot and frame to tension the
strap, and a forwardly projecting strap support
-_ ing member pivotally secured to said foot and
arranged to maintain a short‘ length of the over
pleted. ‘The free end of the arm 53 is tapered, ‘ lapped strap portions in spaced relation to the
as shown, to facilitate its positioning beneath a article during a binding operation.
,
20
strap and the removalof the tool after sealing.
4.‘In a strap stretching tool for binding an
Boss 50 laterally extends beyond arm 52, and varticle, a movable head having a foot adapted to
shank 36 laterally extends beyond the end of boss support a pair of strap ends in overlapped rela 25
50. A coiled spring 55 is compressed between a tion, a gripping member on said head resiliently
cap plate 56 (secured to the end of shank 36 as‘ urged towards said foot and into locking engage- ‘
by a screw) and arm 52 to frictionally maintain , merit with‘the underlying strap end, and a strap
the strapsupporting member in any desired posi supporting member adjustably carried ‘by said
tion. It will thus be appreciated that in the head and extending forwardly thereof, said mem 30
event that our invention is employed for applying , ber having a‘laterally projecting arm disposed
a strap about a curved surface, the overlapping u ‘substantially parallel to and in spaced relation
strap ends may be cooperatively supported be
with the foot, said arm being adapted to engage
tween arm 53 and foot l8 and in spaced relation
to the article being handed so that an open seal
may be properly positioned therebetween on said
strap ends and a ’ sealing tool may be easily
applied to firmly secure the seal in place. In the
event that it is not desired to use the strap
40 supporting member 5|, it will be evident that
it may be easily swung to an inoperative position
as shown in Fig. 1, and spring 55 will tend to
maintain it in said position. Furthermore, when
tensioning a strap about a box or other article
46 having a ?at face, it will be appreciated that
member 5! may or may not be employed, as de
sired.
,
As many changes could be made in the above
construction and many apparently widely differ
ent embodiments of this invention-could be made
without departing from the scope thereof, it is
intended that all matter contained in the above
description or shown in the accompanying draw
ings shall be interpreted as illustrative and not
55
in a limiting sense.
'
'
_
It is also to be understood that the language
the article and cooperating with the foot to sup
port the overlapped strap ends in spaced relation 35
to the article.
‘
5. In a strap stretching device, a forward
strap supporting foot, a rearward strap support
ing foot, gripping means associated with ‘each
foot and arranged to respectively clamp the op 40
posite ends of a flat metal binding strap in super
imposed relation, means to cause a relative
movement of said feet away from‘ each other to
tension the strap about an article in binding re
lation, and a strap supporting member pivotally 45
mounted on the forward foot and having a later
ally projecting arirr located in spaced relation to
the forward foot and adapted to cooperate there
with in supporting a predetermined extent of the ‘
overlapped strap portions above the article being 60
banded irrespective of its shape.
6. In a strap stretching tool, a frame, a ‘fixed >
strap supporting foot thereon, a movable mem
ber within said frame having a forward strap
supporting foot movable relative to said ?xed 65
foot, a gripping means associated with each foot
used in the following claims is intended to cover
and arranged to respectively clamp the opposite
all of the generic and speci?c features of the
invention herein described and all statements of
ends of a ?at metal binding strap in overlying
relation, manually actuated ratchet mechanism
the scope of the invention which, as a matter
arranged to move said feet away from each other
of language, might be said to fall therebetween.
and tension the strap in binding relation about
an article, and a strap support pivotally secured
to the movable foot and projecting forwardly
We claim as our invention:
1. In a strap stretching tool, a strap support
ing foot, a strap tensioning mechanism associated
therewith and arranged to exert a pull in oppo
site directions on the overlapped ends of a bind
ing strap, and a strap supporting member ad
justably connected to said foot, said member
having a laterally projecting arm cooperating
70 with the foot in maintaining a short portion of
the overlapped strap ends spaced from an article
being handed.
2. In a strap stretching device, a frame, a strap
supporting foot movably associated therewith, a
75 strap tensioning mechanism associated with said
thereoffsaid support including a laterally pro- '
jecting arm~adapted to support the overlapped‘
_ strap ends in contacting relation with each other
and to cooperate with the movable foot so that
said contacting strap ends may be easily secured
together with a sealing tool irrespective of the
shape of the article being banded.
70
'7. In a strap stretching tool, a movable mem
her having a laterally projecting foot adapted
to support a pair of overlapped strap ends, a
gripping dog supported by said member and pro;
vided with a laterally projecting ?ange adapted 15
1
2,117,015
4
vided with a strap supporting face, a strap grip
to clamp the lower strap end to the foot, a boss
laterally projecting from said member, a strap
ping dog having a shank journalled in the head ‘
support journalled on said boss, and resilient
means frictionally restraining said movement,
said support including a laterally projecting arm
for pivotal movement and a strap gripping por
tion in overlying relation to said foot, the shank
having a transversely grooved portion terminat
engageable with the article being bound and co
operating with the foot to support a portion of
the overlapped strap ends in contact with each
portion of the rack, said shoulders eng'r ging each
other and cooperating to prevent removal of the
ing in a shoulder. and a shoulder on the reduced
_ strap gripping dog from the head.
other and in spaced relation from said article.
The combination in a strap stretching tool 10
8. In a strap stretching tool, a strap gripping of 11.
a frame, a rack member slidably movable
mechanism comprising a member-having a lat
and having a reduced portion on its end,
erally projecting strap‘- supporting foot and a therein
relatively long bore; a single piece strap gripping a head having a longitudinally extending bore
a transverse bore, said bores intersecting be
dog having a shank journalled in said bore, a and
downwardly extending arm at one end of said tween their ends, the longitudinal bore accom
the reduced portion of said rack mem
shank, and a relatively broad and relatively thin modating
means removably fastening the, head on said
strap gripping ?ange projecting laterallyfrom ber,
reduced portion, a strap gripping dog having a
the lower vend of said arm and located above the shank portion iournalled- in said transverse bore.
foot; a multiplicity of teeth on the bottom-of the the shank having a transverse groove. overlying 20
flange, and a spring located between the mem- '
her and movable arm tending to swing the arm said reduced portion and terminating at one side‘
a depending. shoulder parallel to said longi
and urge the teeth towards said supporting face in
tudinal bore, and an upwardly extending ‘shoul
into strap gripping position.
9. In a strap stretching tool, a head having a der on said reduced portion, said shoulders coop
relatively long transverse bore provided with a erating to prevent removal of the gripping dog 25
curved surface atone end concentric with and from the head without restraining pivotal move
of the dog.
forming a continuation of the surface of the bore, ment
12. > A strap stretching tool comprising a frame
said head having a strap supporting foot posl- ,
having a rearwardly extending handle and a bore
tloned below and extending beyond said surface, - extending axially through said handle, said body 30
a
single
piece
strap
gripping
dog
having
a
shank
30
portion journalled in said bore, 9. depending arm having a supporting surface on its under side, a
at one end of the shank portion'and above said rack bar mounted‘for longitudinal movement in
foot, a relatively broad and thin strap gripping said bore, a head on the forward end of said rack
?ange laterally extending from the lower end, bar and having a bottom supporting surface dis
vof said depending arm and overlying said foot, posed ‘in the plane of said supporting surface on
35 the upper end of said arm. having a curvedface the frame, strap gripping members respectively
slidably bearing on said surface, said depending carried by said‘ body and head and through which
arm being angularly disposed to a plane per-_
pendicular to the foot and including the axis
of the shank; resilient means tending to urge the
.
r
, 40
., H___>ij‘lange
towards the foot and into strap gripping
relatiOn, and means axially positioning the shank
in said bore and vpermitting rotary shank move
ment.
1
,,
_
r
‘
10. The combination ina strap stretching tool
45 of a, frame, a 'rack member slidably movable
therein and ‘having a reduced portion on its for
. ward end, a head mounted on said reduced por
tion and having a laterally projecting foot pro
a strap is stretched when the head and frame are
relatively moved apart, and an operating lever
ratchet-connected to said bar and pivoted to said 40
body forwardly of said handle and adapted to
swing above the handle, said bar and handle be
ing inclined rearwardly and upwardly away from
the plane including the bottom surfaces of said
frame and head.
45
' ‘
HARRISON C. BRISTOLL.
ROBERT V. SANFORD.
HOWARD C. DOOLI'I'I'LE.
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