US2067806A

US2067806A - Strapping tool

Info

Publication number: US2067806A
Application number: US30579A
Authority: US
Inventors: Helmuth W Waldorf
Original assignee: WIRE AND STEEL PRODUCTS CO Inc
Current assignee: WIRE AND STEEL PRODUCTS CO Inc
Priority date: 1935-07-09
Filing date: 1935-07-09
Publication date: 1937-01-12
Anticipated expiration: 1954-01-12

Description

Jan. 12, 1937. H. W. WALDORF STRAPPING TOOL 4 Sheets-Sheet l Filed July 9, 1935 Jan. 12,1937. H. w. WALDORF STRAPPING TOOL Filed July 9, 1935 4 Sheets-Sheet 2 NNN HMMM] Jan. 12, 1937.. H. w. WALDORF 2,067,806

STRAPPING TOOL Filed July 9, 1935 4 Sheets-Sheet 3 Jam.l 12, 1937.- H W, WALDORF 2,067,806

STRAPPING TOOL Filed July 9, 1935 4 Sheets-Sheet 4 Patented `lan. 12, 1937 PATENT OFFICE l STRAPPING 'rooL Helmuth w. waldornNew York, N. Y., assignmlto The Wire and Steel Products Co., Inc.,

Brooklyn, Y.

Application July 9, 1935, Serial No. 30,579

8 Claims.

This invention relates to a strapping tool and has for its object to provide, in a manner as hereinafter set forth, a tool of the class referred to for expeditiously strapping and sealing a binder element around a package.

A further object of the invention is to provide, in a manner as hereinafter set forth, a tool for the purpose referred to including an actuating element for a binder stretcher structure and an actuating element for a binder sealing structure,

said elements beingcarried by a common support, and with said elements disposed in a manner whereby the operator may grasp the binder stretcher structure actuating element for the purpose of holding the tool firmly on the package while the operator is operating the sealing structure actuating element for the purpose of connecting the binder together and for sealing the latter.

2;, Further objects of the invention are to provide, in a manner as hereinafterset forth, a tool for the purpose referred to which is comparatively simple inf its construction arrangement, strong, durable, compact, conveniently operated,

5 thoroughly elicient for the purpose intended thereby, readily assembled, quickly repaired when occasion requires, and comparatively inexpensive to set up.

With the foregoing objects in view, and others which .may hereinafter appear, the invention consists of the novel comqbination, arrangement and construction of parts as will be more specifically referred to and as are illustrated in the accompanying drawings wherein is shown an emg5 `bodiment of the invention, but it is to be understood that changes, variations and modifications may be referred to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a side elevation? of the tool in its i inoperative position,

Figure 2 is'a side elevation of the tool illustrating the sealing structure being disposed in position for actuation to seal the binder or strap,

7, Figure 3 is an elevation looking towards the outer end of the sealing structure prior to its actuation and with the front plate removed,

Figure 4 is a sectional elevation looking towards the outer end of the sealing structure and ,in with parts thereof illustrated in position for sealing the binder or strap and with the front plate removed,

Figure 5 is a bottom plan View of the form of v sealing member forming a part of the sealing structure,

Figure 6 is a fragmentive view in perspective illustrating a band or strap stretched and sealed,

Figure 7 is a fragmentive view in top plan of the tool,

Figure 8 is a section on the line 8 8, Figure 7, 5

Figure 9 is a perspective view of thebase of the tool,

Figure 10 is a front elevation, partly in section, of a modified form of sealing structure in active position, 1o

Figure 11 is a side elevation of the structure shown in Figure 10, y

Figure 12 is` a fro t elevation of a modied form of sealing struc ure in inactive position,v

Figure 13 is a bottom plan view of a modified 15 form of sealing structure, and

Figure 14 is a fragmentive view in perspective of the binder or strap as it wouldappear when operated upon by the modified form of sealing structure. 9

With reference to Figures 1, 2, 3, 4, 7, 8 and 9, more particularly to Figure 9, the tool includes a base I5 formed of a thin plate-like forward section I6, a thin plate-like rear section I1 and a bar-like intermediate section I8 disposed on its lower lengthwise edge and functioning to connect the sections I6, I'I together. The sections I6 and Il are arranged in parallel spaced relation and 'have at-likfe lower faces for seating upon the package which is to be encompassed by the binder 30 or strap. The section I6 is of greater length than the section I'I, has a lengthwise portion thereof, indicated at I9, of less length than its remaining lengthwise portion, indicated at 20.

The section I6 between its transverse median 3f and forward end is formed with a horizontally disposedrectangular opening 2I to provide a clearance for the operation of the sealing elements of the sealing structure, to be referred to, and in this connection attention is directed to 40 Figures 3 and 4. The portion 20 of section I6 has integral with its upper face a pair of parallel spaced ribs 22 forming a binder or strap guide groove 23. The ribs 22 extend from the forward wall of opening 2I to the forward edge of base I5. 45 The ribs 22 are arranged adjacent to opposite sides of the lengthwise median of section I6. The latter has integral with its upper face, in proximity to the rear wall of opening 2|, a vertically disposed stop lug 24 for arresting the rearward 50 shift of the head of the sealing structure, to be referred to, and in this connection attention is directed to Figure 2. The lug 24 is formed with a iiat forward `face 25 and aligns with one of the ribs 22. The face 25 is adapted to abut the head 55 side of and less height than the part 21.

The block 26 is formed with an upstanding forwardly inclined front part 21 having near its upper corner a transverse opening 28 intersected by a furcation 29 opening at the top and forward end of the block. The part 21 provides for disposing the head of the sealing structurel, when the latter is inactive, at a downward inclination and in this connection attention is directed to Figure 1. The part 21 further provides for supporting the pivot, to be referred to, for connecting the head of the sealing structure to the block 26, and in this connection attention is directed to Figures 1 and 2. The part 21 has each side formed with a laterally disposed annular boss 30 registering with the wall of opening 28. The bosses 38 form continuations of the wall of opening 28 and act as spacers between the head of the sealing structure and the part A21 of block 26 when the said head is pivotally connected to block 26, and in this connection attention-'is directed to Figure 1. The 'block2l6 also includes an upstanding rear part 3| integral with thefrear The part 3| constitutes a stop for a purpose to be referred to. The block 26 further includes a laterally extending part 32 which is integral with the inner sides of 'the parts 21 and 3|. The part 32 is of less height than and provides a lateral extension which is common to the'parts 21 and 3I. The block 26 is formed with a threaded transversely ldisposed socket 33 arranged in the

parts

21 and 32 and extending into the part 3|. The socket 33 opens at the inner side of block 26. The socket 33 is for receiving a holdfast device, to be referred to, for anchoring one end of a side cheek, to be referred to, to the block 26 and in this connection attention is directed to Figure 7. The rear end of section I6 is of reduced thickness with respect to the remaining portion thereof. beveled as at 34.

The section I1 has formed integral with its upper face, a vertically disposed part 35 constituting a. support and which is to have secured thereto several elements, to be referred to, of the tool and in this connection attention is directed to Figures 1 and 2f 'I'he part 35 also acts to supportthe lever, to be referred to, of the stretching structure and in this connection attention is directed to Figures Land 2. The part 35 is formed of a. stem 36 merging into a head 31 consisting of` a forwardlydirected downwardly inclined lpart 38 and a rearwardly directed upwardly inclined part 39 provided at its upper end withv ertransversely extending threaded opening'40. The part 31 terminates in a `forward1y directed downwardly inclined arm 4I'having a beveled forward `end 42 and -a transversely extending threaded also integral with the outer side of block 26. The

bar' 45 couples the sections I6 and I1 together and maintains said sections in spaced relation.y

O'ne side and the rear end of section I6 is' The end portion 46 of vsection I8 has a transverse opening 41 for receiving the shaft, to be referred to, ofthe stretching structure and in this connection attention is directed to Figure '1. The bar 45 includes a downwardly curved rear end portion 48 and an intermediate portion 49 which connects the

portions

46 and 48 together. rear end portion 48 of bar 45 is integral with the outer side of extension 35 and the upper f ace of section I1. The inner side of intermediate portion 49 of section I8, in proximity to its lower end, has integral therewith a lateral disposed socket forming member 50 for receiving al spring controlled pawl support, to be referred to, and in this connection attention is directed to Figure 8. v

The section I6 rearwardly of the part 32 of the block 26 has an opening 5I and anchored into the latter is a disc 52 extended above portion 20 of section I6 and formed with a serrated or toothed upper face 53 for a purpose to be referred to. The section I1 of the base I5 is Aformed in its lower face with a guide groove v to be referred to..V The cheek55 has an opening '58 which aligns with the opening 41 in the section I8 of the base I5. The a'rm 4I of extension 35 is of greater width than the part 38 ofthe head 31 whereby the arm' 4I will align with the part 32. The cheek 55 has openings for the passage ofthe holdfast means 56, 51. These openings are notshown.

The'tool includes a binder or strap stretching structure 59 which includes a rotatable holding element 60 of disc-like form having its edge provided with a pair of circumferentially extending spaced rows, 6|', 62 of grippers and between said rows the edge of element 68 is formed with a circumferentially extending row of ratchet teeth 63.` The teeth 63 are set inwardly vwith respect to the grippers. These latter are teeth of taon disc 52. The grippers 6I, 62 coact with the teeth 53Y for the purpose of stretching the binder or strap when the element 68 is revolved in a clockwise direction. -The element 6I is loosely mounted upon an eccentric portion 64 of a shaft 65 journaled in the

openings

41, 58. One end the outer side of the section I8 of hase I5. 'Ihe The- Vof shaft (i5V has a head 65 which abuts against other end of shaft 65 extends laterally from the cheek 55 and carries a retaining nut 61 and awasher 68. Fixed to shaft 65 for the purpose of rotating'it is the hub 69 of a handle member 10.'- The hub 69 is interposed between the washer 68 and .the side cheek 55. The purpose of the handle member 10 is to rotate shaft 65 for elevating and lowering the element 60 relative to teeth 53, for the purpose, when element 6|) is lowered,=to coact with the teeth 53 for grippingv the binder or strap to stretch the latter when the element 68 is intermittently revolved, by a means t'o be referredto, in a clockwise direction,

Lobsely mounted on the shaft 65 between the section I8 of base I 5 and the side cheek 55 is y forward end 1| of handle 12 is formed with a pair of upstanding parallel apertured ears 13 carrying a xed stub shaft 14 arranged rear'- wardly with respect to element 60. Loosely mounted on shaft 14 is a spring controlled dog.

15. The latter extends upwardly and downwardly with respect to`shaft 14 and is formed at its lower -end with a nose 16 for the purpose of intermittently engaging with the teeth 63, to intermittently revolve element 60 on the cam portion 64 of shaft section 65. -The controlling spring for the dog 15 is indicated at 11. -Fixerly secured to the socket forming member 50 is a headed stub shaft 18 upon which is mounted a spring controlled lock pawl 19 extending towards the teeth 63 for the purpose of intermittently engaging therewith to arrest anti-clockwise movement of the element 60. 'I'he pavvl 19 is formed with a nose 80 to engage teeth 63. The controlling spring of pawl 19 is indicated at 8|. The lever 12 is of the oscillatory type and functions, in connection with the dog 15 and the teeth 63, to intermittently revolve element 60 when the latter is lowered relative to the teeth 53 of disc 52, f

The hub 69 of the handle member 10 (Figures 1 and 2) has `a shoulder 82 which coacts with a stop 83 carried by the side cheek 55 for`the purpose of arresting the shifting of handle member 10, in a forward direction.v The lug 83 also coacts with the side edge of a handle member 10 for arresting the shifting movement of the latter in a rearward direction. The handle member 10 has a hand grip 84.

The tool also includes a sealing structure for connecting and sealing the overlapping ends of the b'inder or strap together after the latter has been stretched by the structure 59. With reference to Figures 1, 2, 3, and 4, the sealing structure, generally indicated at 85, consists of a head including a casting 86 formed of a pair of

side members

81, 88 and a back member 89 of less height than the side members. The upper end portions` 90 of the side members are tapered and formed with aligning openings 9|; Each of the side members is cut away to form a shoulder 92, an abutment edge 93, a shoulder 94 and an abutment edge 95. The shoulders 92 arel arranged in parallel spaced horizontal planes. The abutment edges 93 and 95 are arranged in parallel vertical planes. The shoulder 94 is of greater length than the shoulder 92. The edge 93 extends from the inner endV of the shoulderv 92 and terminates in the outer end of shoulder 93. The edge 95 extends from the inner end of shoulder 94 and terminates at the bottom edge of a side of the casting. Thev sides 81, 88 are formed with rearwardly extending parallel apertured spaced ears 96, only one of which is shown. The abutment edges 93 are formed with threaded sockets 91 between the

shoulders

92, 94|. Positioned against the shoulders 92, the abutment edges 93, and the shoulders 94 is a front plate 98 which has its lower end ush with the lower edge of the side-

members

81, 88. The plate 98 is formed for a portion of its length with a pair of spaced inwardly directed anges 99, only one shown, and which abuts the outer end portion of the shoulders 99 and arespaced fromthe abutment edges 95. Extending' through the apertured ears 96, as well as being xed thereto, and

`'also extending through the opening 28 is a pivot for the casting 86. 'I'he front plate 98 is anchored to the

side member

81, 88 by holdfast devices |0|, only one shown, and which engage in the sockets 91. The lengthwise edges of the flanges 99 of the front plate 98 coact with the abutment edges 95 of the side members and with the shoulders 94 to provide a pair of elongated slots |02 opening at the bottoms of the side members. 'I'he casting 86 coacts with ,the front plate 98 to form a chamber |03 to receive elements, to be referred to, of the sealing structure, the chamber |03 being open at its top and at its bottom.

Fixed in the openings 9| is a pivot shaft |04 for a purpose to be referred to. 'I'he pivot shaft |04 extends across the top of the chamber |03. Arranged within the latter is a slide having its upper portion formed centrally with a furcation |06 lengthwise thereof and its lower portion provided with a horizontally disposed furcation |01 opening at its sides and its bottom. The slide |05 is of U-shaped contour and in proximity to each lower corner thereof has fixed thereto a pivot extending across the furcation |01. The pivots are indicated at |08, |09. Extending into the furcation |01 is a pair of oppositely disposed links 0, mounted at their upper' ends upon the pivots |08, |09. The outer side edges of the links intermediate their ends are incurved, as at ||2, to provide clearances when the links are extended relatively to each other on the downward movement of slide |05 by an actuating means therefor, to be hereinafter referred to. When the links are extended, they move in opposite directions relatively to each other through the slots |02. Arranged within the slots |02 are oppositely movable sealing elements 3, I4 which function not only to anchor or connect the overlapping end portions of the binder or strap together,l but also seal the binder or strap. The elements ||3, ||4 are of like construction and but one will be described, as the description of one will apply to the other. Each sealing element is of greater length than the slot |02 in which it is arranged and it extends below the bottom of casting 86. Each sealing element consists of a substantially oblong body part ||5 having a squared outer edge ||6 and a rounded bottom edge ||1. The upper end of body part 5 is bi-furcated, as indicated at ||8, and carries a xed pivot ||9 which. extends across the furcation. The lower end of the linkA ||0 or is connected to aypivot ||9. The body part I I5 at the lower portion of its inner side is formed with a furcation |20 and with the walls of the latter inout, as at |2| to provide edge portions for lifting the strap against the bottom of an abutment element to be referred to. The body part ||5 adjacent its lower end has a transverse opening |22 which communicates at its inner end with the furcation |20. 'I'he upper portion of the inner edge of body part ||5 is rounded, as at |23. An intermediate portion of the inner edge of body part ||5, as indicated at |24, is squared. 'I'hat portion of the inner edge of body part vH6 between edge portions |23 and |24 is inset, as at |25, to form a clearance. The body part ||5 between its transverse median and lower end is mounted on a. pivot |26 which is xed to the back 89 of casting 86. The pivot |26 extends into a cutter member |21 for anchoring the latter within the opening |22 in which member |21 is arranged. The member |21 extends through and beyond the furcation |20 and opposes the incut portions |2| of the walls of the furcation |20.

Anchored to thev back 89 of casting 86 is a centering rod |26 which is disposed at the lengthwise center of said back 89 in proximity to the lower end of the latter. Mounted on the rod |28 is an abutment element |29 formed with an opening |30 for the passage of a holdfast device |3|. The latter extends through the back 89 and has threaded engagement with the front plate 98, as at |32. 'Ihe abutment member has oppositely disposed incurved side parts |33 and oppositely disposed cutouts |34 to receive the inner ends of cutter members |21 during the cutting operation. The cutouts |2| form clearances for the elements ||2, ||3 for receiving the binder or strap during the sealing operation. In this connection see Figure 4. 'I'he cutouts provide for the elements I I3, ||4 acting tov overf lap the seal |35 with respect to the overlapped end portions- |36, |31 of the binder or strap |38. The cutters |21 function to slit the seal |35 at opposite sides and to compress the portions 39 freed by the slitting inwardly at the same time to clamp the binder or strap |39 whereby the overlapped end portions |36, |31 of the binder or strap |38 are securely connected together, as well as being sealed. The members |21 have curved inner ends |40 which correspond to the curvature of the inset portions, |34 of the d member |29.

The slide |05 is vertically moved from the position shown in Figure 3 to theposition shown in Figure 4 to provide for the simultaneous operation of the elements ||3 and I I4. The meam for vertically shifting' the slide |05 consist of a link |4| which extends into the furcation |06 and has its lower end mounted on-a pivot |42 carried by slide |05. Mounted upon pivot shaft |04 is a shiftable head |43 formed with a turcation |44. The upper end of link |4| is mounted upon a pivot |45 carried by head |43. The pivot |45 is normally out of alignment with the pivot |42, that is to say, the pivot |45 is disposed outwardly with respect to the pivot |42 and in this connection see Figures l and 2. The head |43 extends beyond theupper end of the casting 86 and is formed at one side with a. lateral extension |46 which'overlaps the top edge of side 81 with respect to lever arm |41 and also seats on the portion 21 of the block 26.

i. The dog 15 is adapted to contact with the part 3| of the block 26 to arrest the forward movement of lever 12. The sealing structure, when mo'ved to active position has the housing thereof disposed vertically, extended into the opening 2| to bear upon the strap or binder and abut the lug 29. The housing of the sealing structure is not moved to the position referred to until the stretching structure has acted upon the strap or binder. When the housing of the sealing structure has been moved to the position aforesaid, the actuating element or lever |61 is swung forwardly from its position shown in Figure 2 whereby the sealing structure will be actuated to apply the seal to and connect the end terminal bottom of the housing |49. Positioned withinand extending from'the lower ends of slots |54, is a pair of oppositely disposed vshiftable sealing elements |56, |51 respectively, which coact with two oppositely disposed pairs of spaced cutter members |58, |59 respectively, depending and extending laterally from an abutment member |60 anchored within the lower portion of the housing |49. The members |58, |59 depend below the lower end of housing |49 and extend towards the elements |56, |51 respectively. The abutment member |60 has a tapered lower portion |6| formed with oppositely curved sides |62. The lower end of the/body of member A|60 is ilush with the lower end edges of the housing The elements |56, |51 are of like form and each consists of a body part |63- formed with a bi-furcated upper portion and with the furcation indicated'at |63a. The lower endoi body part |63 is provided with a set of inwardly extending parallel spaced tongues I 64, |65, |66. The tongue |65 is of greater width than tongues |64, |66.

When the seal |69 is clamped to the binder or strap |10 the latter is sealed and the binder or strap and end portions |12, |13 connected together to prevent the separation thereof.

The body part |63 of a sealing element has spaced rounded inwardly directednner edge portions |15, |16 and with the latter arranged adjacent to the tongues.l The body parts |63 are mounted upon pivots |11 carried by housing |49 and are adapted to have' their lower'portions swung inwardly towards -each other by a means to be referred to, and when swung inwardly have the tongues coact with the cutter members to form the binder or strap and seal in the manner as shown in Figures l0 and 14. When the-binder or strap and seal are to be operated upon by the sealing structure, they are arranged against the cutter members, when the parts of the sealing structure are in the position shown in Figure l2.

A pair of oppositely disposed outwardly inclined lever members or handles are indicated at |92, |93, formed at their forward ends with oppositely disposed overlapping inwardly inclined offset extensions |94, mounted intermediate their ends upon a pivot |96 carried by the'housing sides |50, |5| in close proximity to the upper ends of the latter. The pivot |96 is disposed at right angles to the pin |90. The extensions |94, |95 are oppositely rabbeted on their inner sides as at |91, |98 respectively, to form said extensions with reduced parts |99, 200 respectively, which oppose the upper portions of the outer sides of the link |84, |85 respectively. The pivots 20|, 202 are prevented from being moved to endwise aligning relation by the lever member |92 abutting an adjustable stop 203 carried on the inner sides of lever member |93. The axes of the pivots 20| 202 are offset with respect to the axes of pivots |18, |96. The pivots |18, |96 are arranged in superimposed parallel relation. The stop 203 also prevents the lever members abutting. The normal position of these latter is as shown in Figure 11. The normal position of the modified form of sealingstructure is as shown in Figure 12. When the lever members |92, |93 are moved away from each other, from the position shown in Figure 11, the slide |18 is moved downwardly to provide for the shifting of the sealing elements |56, |51 to the position as shown in Figure 10 .for the purpose of coacting with the members |58, |59 to apply the seal to and to connect the end terminal portions of the binder or strap together.

The binder or strap is positioned around the package and with the end terminal portions thereof in overlapped relation. The end terminal portions of the strap are extended 'across the opening 2| and are also arranged between the toothed disc 52 and the holding element 60 of the stretching structure 59'. The latter is then operated to provide` for the binder `or strap to be stretched to snuglyv engage the package. During the operation of the structure 59 the sealing structure 85 is in the position shown in Figure 1. After the binder or strap has been stretched to the desired extent the sealing member 69 is then positioned on the overlapped end 'terminal portions |12, |13 of the strap or binder and with the member |69 located over opening 2|. The sealing structure 85 is then swung from the position shown in Figure 1 to the position shown in Figure 2 so as to have the head thereof appear as in Figure 3 with respect to the sealing member and the end terminal portions of the binder or strap. The structure |5 is then operated whereby it will act on and appear as shown in Figure 4 with relation to the seal and binder or strap. The action of the structure 85 will cause the seal and binder or strap to appear as shown in Figure 14. v

What I claim is:

'1. In a tool for the purpose set forth a sealing structure, a stretching structure, each of said structures being provided with a rearwardly extending pivoted actuating element, a base formed with an opening intermediate its ends and spaced guides for a binder or strap, one of said guides being upon the upper face of the base and the other in the lower face of the base, said base being formed with upstanding means extending from the rear end of the base to a point rearwardly of the forward end of the base, means for pivotally connecting said sealing structure intermediate its ends upon the forward end of the upstanding means, means for revolubly supporting and vertically adjusting said stretching structure mounted in said upstanding means in proximity to the forward end of said upstanding means, said upstanding means being formedwith a support and stop, respectively, for the actuating element for .the stretching structure and the actuating element for the sealing structure, and said `base forwardly of said upstanding means being formed with an opening for receiving the forward end of said sealing structure when the latter is in position to be actuated.

2. In a strapping tool, a lever actuated, revoluble vertically adjustable .strap stretching structure, a lever actuated pivotally mounted strap sealing structure, a combined supporting and coupling base common to said structures, said base being formed of a forward section for receiving thereon overlapped end terminal portions of the strap, a rear section and an intermediate section merging into one side of and coupling the said other sections together in tandemwise spaced relation, said front section being formed with an opening for positioning thereover said end terminal portions of the strap and to form a clearance for the operation of the sealing structure upon said terminal portions when the sealing structure is shifted to a position for actuation, an upstanding block inte- Y means extending through the opening in the block for pivotally connecting the sealing structure adjacent the forward end of the forward end of the latter to said block, said intermediate section being formed With an opening, means extending through the opening in said intermediate section for revolubly supporting said stretching structure over said end terminal portions, an extension means on said rear section providing a support for the actuating lever of the stretching structure when the latter is inactive, means carried by said extension to provide a stop for the actuating lever of the sealing structure when the latter is inactive, said rear section having its lower face provided with means for overlapping a portion of the strap which is to be stretched and sealed, and a side cheek secured to said block and the extension on the rear i section and providedA with an opening for the passage of the means which revolubly supports the stretching structure.

3. In a strapping tool, a base formed with an opening, a vertical block on the base and having its lower end disposed rearwardly of said opening, said block including a bifurcated forwardly extending upwardly inclined portion having its top constituting a support, a bodily shiftable sealing structure including a head open at its forward and rear ends and carrying a strap sealing mechanism, said head being provided intermediate its ends with extended spaced ears arranged at the sides of said portion and having its sides extended rearwardly from its front and back, means for'pivotally supporting said ears at the sides of said portion, said head being supported on the top of said portion when said structure is in inactive position and for exten- .sion in said opening when the sealing structure is active to seal the strap, said structure including an actuating lever for operating the on its pivot into said opening, said lever being formed with a forward terminal portion extending between the rear ends of the sides of the head and pivotally connected to said head and to said mechanism, and means on the base rearwardly ofthe block to provide a stop for 'the said lever when said structure is in inactive' ing part of greater thickness than the said other offset part, said front offset part being rearwardly of and inset with respect to the inner side of said block, a side cheek secured against the said side of the block, extending across said opening and secured against said rear part, said cheek being spaced from said front oset part, a strap stretching structure including an intermittently revoluble vertically adjustable strap stretcher element arranged between the cheek and the front oifset part, a stationary strap gripper means and an oscillatory means forA intermittently revolving said element, an adjustable shaft l having a central. part and end parts disposed eccentrically to said central part, said end parts vjournaled in said front o'set part and cheek and said central part revolubly supporting said element and loosely supporting one end of said oscillatory means between said front offset part and said cheek, said gripper means being arranged in i said front section Ybelow said element, a stop 75 means for said element carried by said intermediate section and extended into said opening, one of the end parts of said shaft being extended laterally of said cheek, means carried by saidextended end part for adjusting the shaft to vertically adjust said element'relative to said gripper means, and said rear offset part having its top constituting a support for said oscillatory means when said structure is in inactive position. l

5. In a strapping tool, a strap stretching mechanism including a revoluble holding element, shifting means for the latter, a bodily shiftable strap sealing structure including a head and an actuating lever therefor, a base formed of a front and rear section spaced from each other, an upstanding block integral with said front section', and upstanding part rearwardly of vthe block and integral with said sections for coupling them together, a vertically disposed part integraliwith said rear section and with the rear end of the inner side of said upstanding part, a, side cheek connected'at one end to one side of the block and at its other end to the corresponding side of the said vertically disposed part, said cheek being spaced from said upstanding part, means carried by the forward portion of said upstanding part and said cheek for revolubly supporting and connecting said holding element and shifting means respectively between and with said upstanding part and cheek,

said vertically disposed part constituting a support for said shifting means when the stretching mechanism is moved to non-stretching position,

said block being formed with a forwardly extending upwardly inclined part having an. openf otally connecting said head, intermediate its ends to said block, said front section being formed with an opening for receiving the forward end of said head when thesealing structure is in sealing position, and means carried by y said vertically disposed part to provide a stop for the downward movement of the lever of the sealing mechanism when the latter is moved.

from sealing position.

6. Ina strapping tool, a. base having an upstanding integral blockthereon intermediate its ends, a housing open at its top and bottom and.

being provided with side walls, the side walls intermediate their length and adjacent their rear being provided with ears opposing opposite sides of the block, said housing having the forward portion of its sides provided with slots opening at the forward end thereof, said housing, when the tool is in inactive -position being seated on the top of said block, means for pivotally connecting said ears to said block, an anvil within the housing and disposed centrally relative to the said forward portion, spaced from said housing sides for mounting on the strap to be sealed, a pair of spaced oppositely disposed shiftable sealing members of like form positioned in said slots, extending from the open ends of said slots, pivotally supported from the sides of the housing and arranged in parallel spaced relation to opposite sides of said anvil, each of said\members having its inner sides formed with a furcation disposed diagonally with respect thereto, downwardly inclined, inwardly extending cutters fixed to said members and extending between and beyond the furcations, the inner edges of said members being formed with V- shaped cutouts opening into said furcations through the side walls of these latter to provide edge surfaces above the lower ends of said members for holding the strap against the bottom of the anvil, saidr cutters having inclined cutting edges at their inner ends, said anvil having opposite sides thereof provided with means for re-- ceiving the inner endsof the cutters when said members having their forward ends shifted inwardly towards the anvil to act on the strap, a slide movable lengthwise of the housing, oppositely disposed links pivotally connected to the forward end of the slide and to the inner ends of said members, and a shifting structure for the slide pivotally supported from and within the housing and pivotally connected with the slide.

7. In a strapping tool, a sealing structure including an open top and bottom housing having a front, a back and a pair of sides extending above said front and back, the sides of said housing being provided lengthwise with parallel slots opening at the bottoms thereof, |a vertical anvil anchored within the lower portion of the housing and being provided on its bottom face with two oppositely disposed spaced pairs of cutter members substantially of triangular contour depending from and extending laterally with respect to opposite sides thereof, said anvil having a tapered lower portion, a pair of oppositely disposed sealing elements positioned in said slots, opposing in spaced relation said anvil and extended from the open ends of said slots, each of said sealing elements having its lower end formed with an inner inwardly extending and a pair of outer inwardly extending -strap lifting tongues all arranged in parallel spaced relation and below said anvil, each of said sealing elements being bifurcated at its upper end and pivotally connected adjacent its tongues to one of the housing sides, said sealing elements having their tongues coacting with said members, when said elements are swung inwardly to provide the overlapping end portions of a strap and a coupler for said end portions of the strap with a series of slits at each side of the strap and coupler, a slide mounted in said housing, shifting links for said sealing elements piv- `otably connected to the slide and to the bifurcated ends of said sealing elements, pressure exerting means for the slide pivotably connected to the sides of the housing, and means for pivotably connecting the pressure exerting means to said slide.

8. The invention as set forth in claim 7 having the inner tongue at the outer end of each sealing element of greater width than the outer tongues, and with the space between each outer tongue and the inner tongue being of the same width.

HELMUTH w. WALDORF.