US2656063A

US2656063A - Labeling apparatus

Info

Publication number: US2656063A
Application number: US18507A
Authority: US
Inventors: Robert S Kafka
Original assignee: MIDLAND EQUIPMENT CORP
Current assignee: MIDLAND EQUIPMENT CORP
Priority date: 1948-04-02
Filing date: 1948-04-02
Publication date: 1953-10-20
Anticipated expiration: 1970-10-20

Description

Oct. 20, 1953 R. s. KAFKA LABELING APPARATUS Filed April 2, 1948 6 Sheets-Sheet l INVENTOR.

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A TTQ/Q/VEY Oct. 20, 1953 R. s. KAFKA 2,656,063

LABELING APPARATUS Filed April 2, 1948 6 Sheets-Sheet 2 m I I INVENTOR.

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ATTOE/VEY Oct. 20, 1953 R. s. KAFKA 2,556,063

LABELING APPARATUS 8 J6 1 a0 i5 in ii. 65 A l\\\\\\\\\ \\\\I\\\ INVENTOR. J

ATTORNEY Patented Oct. 20, 1953 LABELING APPARATUS Robert S. Kafka, Woodside, N. Y., assignor to Midland Equipment Corp., New York, N. Y., a

corporation of New York Application April 2, 1948, Serial No. 18,507

24 Claims.

This invention relates to labelling apparatus.

In stores, and particularly in stores where large numbers of articles are to be price-tagged, the labor of aflixing the price tags is very great. For instance, if 1,000 glasses are to be labelled $.39 it is necessary to take a thousand labels, write, print, or type the price upon each one, after which the operator is required to separate the protective backing tape from the adhesive side of the label and apply the label to the glass. This entire operation is done by hand. The complexity of the operation is immeasurably increased by the number of articles that are to be labelled for sale and by the variety of prices at which the articles are to be sold.

It is an object of this invention to make a hand labeller which will print the proper price mark and apply a price label by adhesive to an article.

The objects of the invention are accomplished, generally speaking, by a labeller having a frame or barrel, a. grip, a support for a supply of adhesive tape, a pressure foot by which the tape is applied to the article, and a printing device to stamp the correct price, stock number, and other information on the label before application. Within the outline of the generic invention thus described, there are a number of dependent inventions which contribute to the perfect functioning of the machine.

In the drawings, wherein like reference characters refer to like parts throughout the several views,

Fig. 1 is an elevational left side view of an apparatus constructed in accordance with the principles of the invention.

Fig. 2 is a plan view of the apparatus shown in Fig. 1.

Fig. 3 is an elevational right side view of the same apparatus.

Fig. 4 is a front elevational view of the apparatus.

Fig. 5 is a section on line 5-5 of Fig. 3, illustrating a dependent invention.

Fig. 6 is a vertical section through the delivery rollers that move and separate the layers of the tape, taken on line 6-8 of Fig. 5.

Fig. 7 is a vertical section through the apparatus of Fig. 1.

Fig. 8 is a section on line 88 of Fig. 7, showing a dependent invention.

Fig. 9 is a vertical sectional view through the pressure foot of Fig. 3 as pressure is first applied, showing a dependent invention.

Fig. 10 is a view similar to Fig. 9 but with the pressure foot in almost fully operated position.

Fig. 11 is a section on line lI--H of Fig. 3.

Fig. 12 is a vertical section on the line |2I 2 of Fig. 11 and Fig. 3.

Fig. 13 is a section on the line l3l3 of Fig. 11.

Fig. 14 is a section on the line l4l4 of Fig. 13.

Fig. 15 is a section on the line l5-l5 of Fig. 13.

Fig. 16 is a vertical sectional enlargement through the printing mechanism, reference being had to Fig. 7 for a complementary view.

Fig. 1'7 is a section on the line |1-l1 of Fig. 16.

Fig. 18 is an elevational view of the dependent invention of the roll used in the machine.

In the figures, the numeral 30 is the handle of the labeller, which carries a frame 31 and a trigger 32. The frame is rigidly mounted on the handle. The trigger can be drawn back, being mounted on the frame and grip for such movement. Supported on the front end of the frame is a pressure foot 33 which applies the pressure necessary to make the tape stick to the object to which it is applied. On the rear end of the frame is mounted a roll 34 of adhesive tape. This roll constitutes a dependent invention in itself.

The tape that is employed in this machine has two or three layers, a middle layer consisting of a strip of paper, cellophane or the like which bears upon one side a pressure sensitive adhesive which is protected until application by a cover strip of paper or other suitable material having a low coefiicient of attachment for the particular adhesive employed. On the other side of the adhesive-coated layer is a third layer composed of carbon paper, a typewriter ribbon or other printing assistant. A detail of the roll is shown in Fig. 13, in which 34 is the roll, 35 is a strip of carbon paper that covers the back of the center, adhesive layer, 36 is the label layer with its adhesive 31 on the lower face thereof, and 38 is the protective or cover layer which completes the assemblage by protecting the adhesive until it is applied. The carbon paper can be omitted when the printing device is self-inking or when a roll of preprinted labels is used.

A pair of wings 40 project upwardly and rearwardly from the frame of the machine. As shown in Fig. 1 the wings are actually made by extending the metal of the frame upwardly. A bolt 4| through the wings 40 serves as an axle for the roll 34.

The frame of the gun, 3|, is hollow and is covered for a good portion of its length by a leaf spring 42 which curls upwardly at the rear and applies to the roll 34 sufficient pressure to keep it from unwinding accidentally. The spring 42 is attached to the metal of the frame by screws 43 and a plate 44 in which the screws are countersunk. The spring 42, which serves as a top for the frame of the gun, also serves as a guide for the tape 34', which is laterally guided in the for-- ward parts of the apparatus by the side of the frame and by the roller mechanism hereinafter described.

The first mechanism to which the tape 34 is brought after it leaves the roll 34 and passes under the guide roller 45 (which is mounted in the wings 40 with space enough to permit the strip to pass between it and the spring 4,2) is the printing device. The frame 3| carries a housing 47 which is open at one side as shown in Fig. '7 and receives printing type 48. The ty e 48 extends close to the ath of the stri of tape 34', almost touch ng the outer layer 35 of carbon paper. Inside the frame 3!, with one flat side normally in contact with the bottom of s ring 42. is a wedge block platen 49. its diagonal face tilted rearwardly: beneath this is a slidable block 50 which is normally thrust forward by coil spring so that its forwardly inclined diagonal face 53 engages its rearwardly inclined dia onal face A9. tending to thrust that block upward toward the printing type and against the spring 42.

Reference should now be had to Figs. '7. 16, and 17, the latter of which show enlarged details. The block 49 is attached by screws 52 (Fig. 16) to the spring 42.

The tr gger has a rearwardly pro ect ng portion 53 that can be retracted into a hollow place 54 within the grip 3d of the gun. The rearwardly extending portion 53 has a slot 55 within which,

upon a pivot pin 56, is pivotally mounted a key 57 having an offset end 58 which is spring pressed by spring 59 bearing against the forward end of the slot 55. The u per portion of the key 5'! has an abutment that bears against the underside of the bottom 59 of the frame 3| where it overlies the grip 3D and the tri ger 32, thus limiting the upward motion of the kev. Pr j ct n pwardly from the key and forwardly of said abutment is a prong 6| that pro ects through an opening 62 in a plate 63 which is fixedly mounted by screws 64 on the block 53. This plate 63 and the block 58 are movable backward in the frame against the thrust of spring 5!, by the mechanism that has just been described and operates as follows.

As the trigger 32 is pulled the prong 6i pulls the plate 63 and the block 50 backward against the thrust of spring 5| and against the thrust of a spring 65 which bears upon the trigger itself. An adjustable stop 66 consisting of a headless screw, is mounted in line with the end of offset portion 58 of key 51. When that portion of the key strikes the screw 66 the key is pivoted downwardly about pivot 56 moving the prone 6| out of the slot 62. The block 50 is instantly shot forward against block 49, the inclined faces transferring the shock vertically through the spring 4-2 and forcing the top layer of the strip against the type, printing by impact. The trigger is then released and is moved forward by spring 65 to its inoperative position, allowing the prong 5| to enter the slot 62 in readiness for application of another label. The type 48 can be changed by the simple expedient of withdrawing them from the housing 41. The housing is provided with slots 4'! which receive flanges 48 on the type. The type are also provided with extensions 48 that bear against the upper portion of the housing and transmit the shock. The impact can be regulated, by choosing the strength of spring, from ordinary typewriter stroke to a trigger 32.

stroke suflicient to cut a stencil. Thus, this machine is capable of not only printing but of cutting a stencil in stencil material if desired.

After having been stamped the strip 34 passes by a doctor blade i0 which removes the upper layer 35 of the strip. The right hand side of the gun is open just above the spring 42, as indicated at H in Fig. 3, so that the strip can be threaded into the apparatus from the side without displacing any portions of the frame or of the auxiliary structure carried by the frame. When the strip is threaded into the machine the layer 35 is taken out over the edged blade ii the printed strip 35 and the cover strip 38 continuing on over the block 44 under the forward raised portion ('2 of the frame 3|. Thence, it passes between two

rollers

13, 14 which are driven by the trigger 32 and act to advance the strip and to separate the cover 38 from the adhesive label 36. The

rollers

13, 14 do not necessarily, and in fact preferably do not, grip the tape between them.

A U-shaped support 15, attached by a screw 16, to a depending portion 1! of the frame, supports at its ends a pivoted carriage 18 by means of pint es 19 at the ends of which are pivotally mounted two

rollers

80, 8|. The rollers 13, I4 are preferably covered with soft rubber, and the rollers 83, 8! are of knurled metal. In addition the roller 88 has knurled lands 30 and grooves St between the lands. This structure constitutes a dependent invention of considerable importance because the roller is in contact with the pressure sensitive adhesive itself and in its set position constitutes an idler roller between which and the roller 13 the tape is gripped and driven. The roller pair 148| serves to grip and drive the layer 38 in the same way. The knurling 89 should be as sharp-pointed as possible, as it is my discovery that the use of such sharppointed knurled lands acts to move the adhesive covered layer without sticking to it. The rollers 8! are so spaced that they act to separate the cover layer from the adhesive layer with a maximum of efficiency. Thus, the layer 36 is projected outwardly from between rollers 13--8IJ at a tangent to their line of contact.

The trigger-operated mechanism to turn the rollers '13 and F4 involves a mechanism for adjusting the length of stroke so that tickets of different sizes can be cut oil. The trigger 32 has a rack bar Si! which engages a pinion 9|, as shown in Figs. '7 and 11-15 inclusive. The rack bar 90 is mounted by a pin 92 in a yoke in the The pinion 9! is mounted upon a shaft 93 which projects at one end from a casing 94 which is attached to the frame 3| by screws 95. The casing 94 has a chamber 96 extending inward from the left. The shaft 93 has a rounded projecting end 9'! and is reduced at 98 to form an abutment against which the gear 9| rests. A sleeve 9% has a forced fit over the inner reduced end. of shaft 93 and against the gear 9!. The gear is thus held rigid with respect to the shaft.

. It may be keyed on additionally if desired. Be-

tween the end of the sleeve 99 and the gear is a clutch ring 496 having pron s It! that engage the teeth of the gear and prongs I02 that engage splines 103 on the inner face of a rotatable member 94 which is held in the housing by a key I which fits in the keyway 106 and in a slot in the upper portion of housing 94. Thus, the rotatable member 194 can be turned with respect to the housing whenever clutch prongs I02 are moved into engagement with the splines I03. A

spring I III is placed within a recess within the member I04 and bears against the end of sleeve 99, keeping the clutch out of engagement except when the end 91 is thrust inward by mechanism provided for that purpose. Mounted upon the outer end of rotatable member I04 is a gear I08.

The rollers i3, I l have projecting axles, on the same side of the gun as the gear I08, upon which are keyed sprockets III], III. A chain II2 passes over sprockets I 08, H0, I II and transmits the motion imparted by the trigger 32 to the rollers 'I3-80, I I-8|. A spring I I3 serves as a positioning guide for the chain II2. This spring is held on the frame by a split screw II 4 and a nut II5.

It will be seen from the foregoing that there has been provided a mechanism which holds a supply of tape, prints the adhesive layer, separates the printed layer, removes the cover layer, and projects the adhesive layer to a position of application.

In order to advance the tape a selected distance, an adjustment is provided which regulates the length of each stroke. Referring to Figs. 3, l1, and 12 a support I29 extends upward from the trigger 32, to which it is attached by means of screws l2I and fits snugly against the inside of the frame SI on the right hand side of the gun. This support is provided with a slot I22. inside of the support I26 by a screw I24 which projects outwardly through the slot and by a nut I25 which bears against the outside of the sup port I23. By loosening the nut, the cam block I23 can be moved throughout the length of the slot I22. When that block is advanced to the right as shown in Figs. 11 and 3, the trigger 32 will travel a certain distance before the cam on the block engages the rounded end 9'! of the shaft 93. Consequently, the clutch will be engaged to drive the gear I08 only during a small part of the stroke. On the other hand, when the block i23 is moved to the left so that the cam engages shaft e1 at the start of each stroke, the sprocket I08 will be driven throughout the length of each stroke and advance the tape a longer distance. As soon as the trigger is released the block 123 is thrown out of engagement with the shaft er and the spring It! moves the clutch I89 out of engagement with splines a;

I03, terminating the motion of the tape.

A pressure foot 33 is provided to press the adhesive coated layer 35 against the object to be marked. A. support I as is mounted by screws I3I (Figs. 7, 8, 9, and in the raised portion 72 of the frame 3I. The support is provided A cam block I23 is held against the with an inclined face I32 upon which is mounted a guide I33 (Fig. 9 having a flanged end proiecting toward the line of contact of rollers 13-439. The layer is prevented by the flanged ends of the guide !33 from following the roller I3 around and becoming entrapped. A spacing block I34 rests upon the guide I33 and elevates a fixed scissor member I35 sufficiently to permit a travelling block I36 and a moving scissor member I3! to slide back and forth within the limits allowed by an aperture I38 in them. This aperture encloses the block I34. Mounted upon the fixed shear IE5 is a spring connection I 39. A spring I40 is connected at one end on the support I39 and at the other end to the sliding block I36. The sliding member, or pressure foot, I36 has upstanding walls I M to which the spring I4!) is attached by means of a pin or rod I42. This spring keeps the pressure foot 33- I4I-I36 in an advanced position except when pressure is applied.

The cutter is composed, as shown in Fig. 8, of the upper spring member I 35 having a convex forward cutting edge I 48. This member is fixed by being mounted on the block I34 and the support I32. Beneath that cutter member is another, I31, having an approximately triangular opening I49 through which the adhesive layer projects. The cutting edge of this member is I50. When pressure is applied to the pressure foot 33 the foot slides upward against the tension of spring I 43 drawing the knife member 13? and forcing the adhesive layer against the knife edges I48, liiil. Cutting proceeds from the outer portions of the cutting edges toward the center. A true shearing action occurs and resistance is kept at a minimum.

In order to secure the proper adhesion of the tape to a surface, the pressure foot is provided with a soft rubber pad I5I which is fixedly attached to the forward wall I 52 of the foot as far as the bend I 53. From that point on the foot is free and is bent around and above the forward end of the upper knife and is attached to a member I5 2 which projects forwardly from the fixed support I39. When the tape is to be applied, the gun of 8 is placed in the position shown in Fig. 9 and pressure is applied, the pad I51 forcing the adhesive on the bottom of layer 35 into close and sticking engagement with the surface. As the pressure overcomes the force of spring M9, the foot 33 is moved upwardly along the face of support I32 and the free end I5I" of member tail is forced forwardly and down as shown in Fig. 10, thus acting to aflix that part of the strip which is released by the action of the cutters 535-431.

In Fig. 6 is shown another dependent invention which contributes to the perfect functioning of the apparatus. In this figure a curved spring member I68 is attached to member 1 8. The end of this spring member is cut into teeth of prong type, I 6|, I82 of which teeth ISI are displaced from the plane of teeth i612 and ride more or less in the grooves 526 of the roller 88 with their ends projecting more or less tangentially toward the path of the tape 36. The other teeth I62 project toward guide I33 so that the strip 35 is guided on opposite sides as it leaves the rollers IS-89.

Among the advantages of this invention are the following:

This is a very useful labeller; uses a plain, unperforated tape; it will print and attach an adhesive price label to an article of merchandise; it is operable to cut off a selected length of tape; it employs the principle of impact printing or stencil cutting; in it the tape is threaded from the side and is visible to the operator at all times during the operation; it overcomes the problem of the adhesive sticking to the roller; it employs the principle of pyramidal. knurling; the cutter is a novel and useful conception, employing the principle of a double scissors cut. It efficiently separates the layers of a tape.

As many apparently widely different embodiments of the present invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the specific embodiments.

What is claimed is:

l. A labelling gun for the application of adhesive tape having a plurality of layers of which one bears pressure-sensitive adhesive and another covers the adhesive until use, comprising a frame, a grip, and a trigger, a tape supply holder, guide means on the frame for a strip of tape from the holder, printing means carried by the frame adjacent the path of the tape, means operable by the trigger to force the tape and the printing means together, gripping means operable by the trigger to advance the tape and to separate the adhesive layer from the cover layer, a label applier carried by the frame adjacent the path of the adhesive layer, and means to sever the adhesive layer as pressure is aplied thereto by the label applier.

2. A labelling gun for the application of adhesive tape havin a plurality of layers of which one bears pressure-sensitive adhesive and another covers the adhesive until use, comprising a frame, a grip, and a trigger, a tape supply holder, guide means on the frame for a strip of tape from the holder, printing means carried by the frame adjacent the path of the tape, means operable by the trigger to force the tape and the printing mean together, edge means to separate a third layer 1 in the tape, gripping means 0perable by the trigger to advance the tape and to separate the adhesive layer from the cover lay-- er, a label applier carried by the frame adja cent the path of the adhesive layer, and means to sever the adhesive layer comprising trigger operated severing means operable by motion of the label applier.

3. A labelling gun hesive tape having plurality of layers o one bears pressure-sensitive ad iecive covers the adhesive until use, comcri a grip, and a trigger, a tape suppl means on the frame for a strip of tape item t... holder, printing type supported over the frame adiacent the path of the tape, impactme" operable by the trigger to force the tape and the printing means together, gripning means cperable by the trigger to advance the tape a to separate the adhesive layer from the cover layer, a label applier earned by the frame adjacent the path of the adhesive layer, and means to sever the adhesive layer as pressure is applied thereto by the label applieri. A labelling gun f r the application of adhesive tape having a plurality of ayers of which for the application of ad- 1 one bears pressure-sensitive adhesive another covers the adhesive until use, comprising a frame, a grip, and a trigger, a tape supply holder, guide means on the frame for a strip of tape from the holder, printing type supported over the frame adjacent the path of the tape, a wedge having a surface adjacent the path of the tape opposite the type, an impact Wedge operable by the trigger to move the said Wedge and the tape against the type, gripping means operable the trigger to advance the tape and to separate the adhesive layer from the cover layer, a pressure foot carried by the frame adjacent the path of the adhesive, and means to sever the adhesive layer as pressure is applied thereto by the pressure foot.

5. A labelling gun for the application of adhesive tape having a plurality of layers of which 0 -e bears pressure-sensitive adhesive and another covers the adhesive until use, comprising a frame, a grip, and a trigger, a tape supply holder, guide means on the frame for a strip of tape from the holder, gripping means operable by the trigger to advance the tape and to separate the adhesive layer from the cover layer including a pair of rollers driven by the trigger and gripping the adhesive layer, means to separate the cover layer from the adhesive layer, the surface of the roller engaging the exposed adhesive being grooved and knurled, a pressure foot carried by the frame adjacent the path of the adhesive layer, and means to sever the adhesive layer as pressure is applied thereto by the pressure foot.

6. In labelling apparatus a driving member movable linearly, a driven member movable circularly, a driving mechanism connecting said members including a gear driven by the driving member, a clutch having a part moved by said gear and another part connected to the driven member, and means moved by the driving member to bring the parts of the clutch into engagement.

7. A labelling apparatus including means to move a strip of tape, printing type adjacent the path of the strip of tape, a Wedge shaped platen adjacent the tape opposite the type, impact means to force the tape into printing relation to the type comprising a spring loaded wedge and means to release the spring to drive the wedge against the platen.

8. Labelling apparatus including tape advancing means, and means to drive said tape advancing means including a rack and pinion, means to transmit the motion of the pinion to the advancing means, a clutch in said motion transmitting means, cam means operable by the rack, and clutch engaging means connected to said clutch comprising cam follower means operable by said cam means.

9. Labelling apparatus including means to hold a roll of adhesive tape, and means to grip and advance the tape including a pair of gripping rollers, one of said rollers having a sharply pointed pyramidal knurled surface, divided in small knurled areas by grooves, for contact with the adh sive, and means to drive said rollers.

10. A labelling machine for the printing of tape having a plurality of layers of which one hears pressure sensitive adhesive and another covers the adhesive until use, and for the separation of labels from the tap their application to an object, comprising a frame, a tape holder mounted on the frame, tape advancing and layer separating means supported by the frame, tape printing means supported by the frame, a trigger carried by the frame, motion transmitting means energizing the advancing, printing, and separating means from the trigger, label applying means comprising a retractable pressure foot held by spring means in position to support and apply the tape, and cutter means activated by the retraction of the foot during the application of a label to separate the label from the tape.

11. Th machine of claim 10 in which the frame comprises a barrel, and a grip adjacent the trigger.

12. The machine of claim 10 in which the advancing and separating means comprises a pair of rollers between which the tape passes and rollers in gripping engagement with said rollers.

13. The machine of claim 10 in which the advancing and separating means comprises a pair of gripping rollers for each of the said layers of the tape, said pairs of rollers being slightly separated a distance greater than the thickness of the tape.

14. The machine of claim 10 in which the motion transmitting means comprises means to vary the distance the tape is moved by the motion of the trigger.

15. The machine of claim 10 in which the adhesive face of the tape makes contact with a gripping roller having circumferential grooves and sharply pointed, pyramidal knurling between the grooves.

16. The machine of claim 1.0 comprising a tape guide for the adhesive layer having a flat portion adjacent one side of the layer and staggered, spaced finger points normal to the adhesive side.

17. The machine of claim in which the cutter means comprises shears having a blade with an opening to receive the tape and an internal knife edge, and a cooperating blade, said blades being activated by motion of the pressure foot.

18. A labelling machine for the printing of tape having a plurality of layers of which one bears pressure sensitive adhesive and another covers the adhesive until use, and for the separation of labels from the tape and their application to an object, comprising a frame, a tape holder mounted on the frame, tape advancing and layer separating means supported by the frame, tape printing means supported by the frame, power means for the apparatus comprising a linearly movable element supported by the frame, motion transmitting means operatively connecting the linearly movable element with the advancing, printing and separating means, label applying means comprising a retractable pressure foot held by spring means in position to support and apply the tape, and cutter means activated by the retraction of the foot during the application of a label to separate the label from the tape.

19. A labelling machine including, in sequential association tape supply means, tape printing means, tape severing means, and tape applying means having a face for pressing the tape against an object, means to guide the tape from the said supply means along a route to the said means in sequence, means to move the tape intermit tently along said route to form tickets of selected length, means associated with said moving means to activate said printing means to print said tickets, and energizing means connected to and operated by said applying means as the tape is pressed against an object to activate said severing means.

20. The machine of claim 19 in which the said parts are mounted in sequence on a frame and are open to the tape from one side of the frame.

21. The machine of claim 19 in which the tape is comprised of plies, and the tape moving means H includes a pair of spaced rollers between which the tape is received, each said roller being in gripping association with other rollers which are more widely spaced from each other, each pair of gripping rollers gripping a ply of the tape to separate the plies and being driven by said means to move.

22. The machine of claim 19 in which the said face is comprised of a resilient pad having an angularly arranged portion, and said applying means includes means to flatten the angularly arranged portion of said pad against the object in applying the ticket.

23. Labelling apparatus including a holder and tape advancing means adaptable to handling adhesive coated tape including a pair of tape gripping rollers of which one has tape-engaging, circumferential lands spaced by intervening circumferential grooves, said lands having sharp pointed knurling for engaging the adhesive coat of said tape, a flat guide paralleling the path of the tape where it issues from between the gripping rollers, and a pronged guide with staggered prongs on the said adhesive coated side of the tape, the longitudinal axes of the ends of the prongs whereof are approximately normal to the adhesive surface of the tape.

24. Labelling apparatus including roller means to move a strip of adhesive tape, and prong guide means having a plurality of prong like teeth beyond the roller, the points of said teeth being adjacent the adhesive side of said tape and the ends of the prongs being aligned approximately normal to the adhesive side of the tape.

ROBERT S. KAF'KA.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 795,621 Kachline July 25, 1905 998,164 Feist July 18, 1911 1,019,719 Maynes Mar. 5, 1912 1,130,205 Siedle et a1 Mar. 2, 1915 1,268,151 Rettell June 4, 1918 1,372,221 Dutro et a1 Mar. 22, 1921 1,411,789 Kellogg Apr. 4, 1922 1,484,136 Kohnle Feb. 19, 1924 1,647,305 Peters Nov. 1, 1927 1,742,814 Jones et al Jan. 7, 1930 1,775,404 Mohr Sept. 9, 1930 1,799,533 Remnsnider Apr. 7, 1931 1,870,197 Sibley Aug. 2, 1932 1,968,881 Edwards Aug. 7, 1934 1,972,850 McCarthy Sept. 4, 1934 1,972,851 McCarthy Sept. 4, 1934 2,051,491 Lockett et al Aug. 18, 1936 2,080,056 Miller May 11, 1937 2,220,708 Close Nov. 5, 1940 2,360,965 Mosher Oct. 24, 1944 2,460,659 Schmidt Feb. 1, 1949 2,502,257 Hawkins et a1 Mar. 28, 1950 2,511,857 Fritzinger June 20, 1950