US2757584A - Tear tab machine - Google Patents

Description

mg. 7, 1956 A. CLEMENTE 2,757,584

TEAR TAB MACHINE Filed Oct. 11, 1950 5 Sheets-Sheet l IN VEN TOR.

BY WM Mag, 7, 1956 Filed Oct. 11, 1950.

A. CLEMENTE TEAR TAB MACHINE 5 SheetsSheet 3 INVENTOR. /46'0-577/V0 CLEMEA TE Aug. 7 1956 A. CLEMENTE TEAR TAB MACHINE 5 Sheets-Sheet 4 Filed Oct. 11, 1950 IN VEN TOR. 1460677 1/0 CZEME'A IE ,4 Tram/5y Aug. 7, 1956 A. CLEMENTE TEAR TAB MACHINE 5 Sheets-Sheet 5 Filed Oct. 11, 1950 INVENTOR. /4606'7//V0 CZE'ME/VTE A TTOIPA/E) United States PatentO TEAR TAB MACHINE Agostino Clemente, Elkins Park, Pa., assignor, by direct and mesne assignments, of one-fifth to Peter Dippolito, Philadelphia, one-fifth to John D. Conti, Elkins Park, and one-fifth to Emil M. Farris, Wayne, Pa., and onefifth to Morris A. Rabkin, Camden, N. J.

Application October 11, 1950, Serial No. 189,518

14 Claims. (Cl. 93-1) This invention relates to improvements in mechanisms for applying a succession of tear tabs to a web of wrapping material and slitting the edge of said web on each side of the tear tabs.

One of the primary objects of the present invention is to provide a more compact and efiicient mechanism for performing the operations of affixing tear tabs to a web of wrapping material for wrapping cigars, cigarettes, candy, bread, and other products than such mechanisms heretofore developed.

Another and important object of the present invention is to provide a mechanism of the character mentioned having improved and effective means for slitting the edge of a web of wrapping material and severing tear tabs from a strip of material without wrinkling the edges of the materials.

A still further object of this invention is to provide a mechanism for the purpose mentioned having improved means for advancing the tear tab strip across the Web of wrapping material and regulating the lengths of the tabs.

Another object of the present invention is to provide eifective means for heat sealing of the tear tabs to the web of wrapping material.

Other objects and advantages of this invention will be apparent from the following specification taken in connection with the accompanying drawings.

In the drawings:

Fig. 1 is a top plan view of a tear tab mechanism embodying the present invention, but showing the yoke which carries the upper shearing blades and the spring urged pressure member removed, and also with the front and middle cover plates removed from base 10.

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1, looking in the direction of the arrow.

Fig. 3 is a partially sectional view taken on the line 3--3 of Fig. 1.

Fig. 4 is a fragmentary sectional view taken on the line 4-4 of Fig. 2 and showing the cover plate removed.

Fig. 5 is a view similar to Fig. 4, but with the front and middle cover plates and other parts in assembled position.

Fig. 6 is a perspective view of the rear cover plate.

Fig. 7 is a sectional view showing cam elements for lifting the top feed roller shaft taken on the line 7-7 of Fig. 5.

Fig. 8 is a side elevation of a reel for the tear tab strip.

Fig. 9 is a rear elevation of the reel shown in Fig. 8.

Fig. 10 is a plan view of a section of the web of wrapping material and a tear tab applied thereto.

Fig. 11 is a sectional view taken on the line 11-11 of Fig. 10.

Fig. 12 is a side view of a combined quadrant and disc for limiting the advance of the tear tab strip.

Fig. 13 is a sectional view of the quadrant shown in Fig. 12, as installed in combination with the means for advancing the tear tab strip, taken on the line .1313 of Fig. 2.

Fig. 14 is a sectional view taken on the line 14-44 'ice of Fig. 4, but showing the rear cover plate in position on the base of the mechanism.

Fig. 15 is a fragmentary sectional view taken on the line l5-15 of Fig. 2.

Referring to the drawings, in which like numerals designate like parts in the several views, the improved mechanism for applying tear tabs to a web of wrapping material includes a base 10 adapted to be attached to a machine for wrapping cigars or other articles with sheet material fed through the machine on suitable rollers, by means of a bracket 12 carried by the tear tab mechanism. The wrapping machine (not shown) may be of any conventional type in which articles are automatically wrapped. Such machines are provided with means for advancing a web of wrapping material continuously or intermittently at a timed rate of travel, and it is therefore essential that the rate of advance across said web of a strip of material from which tear tabs are severed be coordinated with that of the Web of wrapping material.

The base 10 is preferably of rectangular form, having walls 14 and being open at its top and bottom. The plates 16 and 18 are secured to the top of the base to shield the mechanism mounted inside the base and to form a supporting surface 20 for the Web of wrapping material 22, which is arranged to move transversely across said surface. Guide plates 24 and 25 for the tear tab strip 28 are secured to base 10 between the opposed ends of plates 16 and .18. Plate 18 is provided at its front end with a pair of spaced, narrow slots 3i) Fig. 6), a Wider slot 32 extending longitudinally of said plate, and a circular opening 34 in its central portion. Plate 18 has elevated portions 36 at its front end outwardy from slots 30 for lifting the front edge 38 of web 22, to permit pasage of the end of the tear tab strip 28 back of the web when the tear tab strip is advanced, as more clearly shown in Fig. 3.

A shaft 40, transversely journaled in the walls 14 below plate 18, has rigidly mounted thereon a gear wheel 42 and a rocker arm 44. Meshing with one side of gear wheel 42 is a vertical rack member 46 which is slidably mounted in a guide sleeve 48 depending from a rear plate 50. The plate 50 is secured to the top of base 10 and provides a continuation rearwardly of the surface 20. To the outer end of rack 46 is rigidly secured. one end of a yoke 52 having depending portions 54 and also depending guide legs 56 slidably mounted in vertical openings 58 in the walls 14 of base 10. In the construction described, the yoke is positively guided at both ends for reciprocal movement on base 10.

Another rack member as meshing with the opposite side of gear wheel 42 is guided for slidable movement in a guide member 62 secured within the Walls of base 10. A support member 64 is rigidly connected to rack member 60 through an integral arm 66 on support member 64 and a corresponding arm 63 on rack member 6%, together with a screw 79 slidable in slot 72 of arm as by means of which support member 64 is adjustable longitudinally of base 10. A pressure member '74 is slidably mounted on yoke 52 in opposed alignment with support member 64. A spring 75 urges said pressure member toward the base 10 and the support member 64. Pressure member 74 is adjustable toward and from base 19 by means of nuts '78 on threaded stem 39 projecting through yoke 52. A spline 82 in a slot 84 of stem d0 engages :1 corresponding slot 85 (Fig. 15) in yoke 52 to hold the pressure 1nember 74 against rotation.

Rocker arm 44 is connected through link member 86 with one end of a lever 88 which is pivotally mounted near its front end on a transverse shaft 90 and has a roller 92 on its front end in contact with a cam 94 mounted on another shaft 96. A spring 98 attached to the rear end of lever 88 and to a support 100 on base 10 urges roller 92 into Contact with cam 94. A sprocket wheel 102 on shaft 96 is driven by a chain 104 from a suitable motive source. An electrical heating element 106 is rigidly connected through bracket 108 with supportmember 64 and is supplied with current through wires 110 and 112 from any suitable power source. The support and pressure members 64 and 74 are normally spaced apart, as shown in Figs. 2 and 3, to receive the web of wrapping material 22 and the tear tab strip 28 therebetween preparatory to the operations of clamping or pressing the end of the tear tab strip to the web, slitting the edges of the web on each side of the tear tab strip and severing a tear tab strip from the strip, which may be provided with a fusible coating for heat sealing, or with adhesion material for sealing under pressure only. In either case,.the parts just described will be substantially the same.

For the operation of slitting the front edge of the web 22, a pair of identical shear blades 114 are hinged at one end to supports 116 secured by screws 118 to brackets 120 carried by the walls 14 of base 10. Slots 122 are formed in supports 116 at one end and the screws 118 project through theseslots to permit adjustment of the rear ends of the blades 114 toward each other. A slot 124 is provided in the free end of each shear blade 114 and a screw 126 projects through this slot into support 116 to afford means of angular adjustment of the blade 114. A spring 128 is mounted on each screw between the blade 114 and support 116, this spring being under sufficient compression to urge the blade outwardly on its hinge, thereby forcing the blades at an angle to each other convergent rearwardly. As shown more clearly in Fig. 14, the upper edge of each blade 114 lies just below plate 18, substantially in registry with one of the slots 30, but is urged outwardly by spring 128, so that the blade is on a slight bias with the slot. Opposed blades 130, cooperative with blades 114, are rigidly secured by screws 132 to the depending portions 54 of yoke 52 with provision through slots 134 for adjusting blades 114, as more clearly shown in Figs. 2 and 4. As shown in Figs. and 14, the blades 130 are in alignment with slots 30 in plate 18, blades 114 being on a slight yieldable bias with the blades 130. The blades 114 may be angularly adjusted, either outwardly or inwardly in relation to the blades 130, by means of the screws 126.

For the operation of severing tear tabs from the tear tab strip 28, a single shear blade 136 similar to either of the blades 114 is hinged at one end to a support 138, which support is mounted on a cross-bar 140 of the base transversely of the blades 114. One of the screws 142 securing support 138 to cross-bar 140 at the free end of blade 136 passes through a slot 144 which aifords means of angular adjustment of the blade 136, and a spring 146 mounted between the free end of blade 136 and support 138 urges the blade 136 outwardly at an angle in relation to support 138. A blade 148 is rigidly, but adjustably, mounted transversely on yoke 52 between depending portions 54, and is provided with a slot 150 and screw 152 which afford means of adjustability of blade 148 toward the base 10.

The tear tab strip 28 is preferably wound on a reel 154 journaled upon an arm 156 mounted at the front end of base 10 and from this reel the strip is intermittently advanced across the web 22 by means of rollers 158 and 160 and guided between plates 24 and 25. Roller 158 is mounted on a shaft 162 which is journaled in an arm 164 pivotally mounted on a shaft 166 carried by a bearing 168 and having a flanged idler pulley 170 on its inner end under which the tear tab strip is supported and guided thereby. A rotating and lifting handle or knob 163 is mounted on the outer end of shaft 162. Roller 158 may be covered by a resilient cylindrical coating or cylindrical casing 172 to provide additional grip on the tear tab strip, which may be made of material having a slippery surface. A spring 174 urges arm 164 toward base 10, thereby holding roller 158 in contact under pressure with lower roller 160. The roller has an annular groove 176 intermediate its ends in which a finger 178 projecting from the rear end of lower guide plate 25 is inserted to align the plate with the tear tab strip. Roller 160 is mounted on shaft 180. Intermeshing gear wheels 182 and 184 are mounted on the respective shafts 162 and to provide positive means for rotating rollers 158 and 160 simultaneously. A ratchet wheel 186 is also mounted on shaft 180. A pawl 188, pivoted on an arm 190 which is mounted on the shaft 180, is actuated through link 192, rocker arm 194 and cam 196 to rotate shaft 180 in a clockwise direction, as viewed in Fig. 2, to advance the tear tab strip 28 intermittently toward web 22. Rocker arm 194 has a spring urging its forward end into contact with cam 196. The arm 194 is mounted on shaft 90 which also carries the lever 88 connected with rack members 46 and 60. Pawl 188 is of sufficient width to overlie the outer perimeter of a disc 198 which is freely mounted on the shaft 180 and carries a toothed quadrant 200. This quadrant is in mesh with a pinion 202 carried by a stub shaft 204. A portion 206 of the perimeter of disc 198 (Fig. 12) is of slightly greater diameter than the ratchet wheel 186 so that, when it is desired to limit the effective stroke of pawl 188, the disc 198 is rotated to bring such portion of the larger diameter under the pawl as necessary to limit the rotation of the ratchet wheel 186 as desired to regulate the advance of the tear tab strip 28.

. Stub shaft 204 projects through a sleeve 208 fixed in i one wall 14 of base 10 and has a handle or knob 210 on its outer end. The outer end of sleeve 208 is tapered, split, and screw-threaded, and a nut 212 is threaded on the end to lock the shaft 204 against rotation after the disc 198 has been adjusted as desired. The details of this feature are shown in Fig. 13.

Brake means for reel 154 comprises a resilient plate 214 secured at 216 to arm 156 and an adjusting pin 218 screw-threaded through arm 156 and having a wheel 220 for rotating said pin. The inner end of pin 218 bears against plate 214, the outer end 221 of which is in frictional contact with reel 154. Any desired longitudinal tension may be placed on tear tab strip 28 by adjusting the pin 218 in relation to plate 214. Such adjustments are important in advancing the strip 28 for the reason that, if the tension'is not sufficient, the strip will tend to sag and wrinkle, and if it is too great, the strip will slip between the rollers 158 and 160.

Shaft 162 extends across the base 10 through a support 222 comprising a guide for said shaft (Fig. 7). A cam member 224 is mounted transversely in the support 222 below shaft 162, the shaft 162 resting and in a cut out portion 226 of the cam member. A handle 228 is attached to one end of the cam member for rotating this member to lift shaft 162 and thus raise the roller 158 from contact with roller 160, as when inserting the end of a new reel of tear tab material.

Although it is to be understood that the web of wrapping material. 22 is movable, and that the mechanism for applying tear tabs thereto must be coordinated with the movements of the web, the means for controlling the web forms no part of the present invention. It is to be understood that the web of wrapping material may be carried by any conventional type of machine for wrapping cigars and the like, to which the mechanism of the present invention is attached.

From the foregoing description, it will be seen that the tear tab strip .28 is advanced intermittently across the web of wrapping material 22 by means of rollers 158,

. 160, ratchet wheel 186 and pawl 188, the latter being actuated by cam 196. The extent, or distance, of advance is controlled by the disc 198 and quadrant 200, by means of. which the distance of advance may be adjusted according to the length of tear tab desired.

As the tear tab strip advances, the front end of the strip passes back of the front edge of web 22, which is lifted from "thesurface 20 by the elevated portions 36 of the plate 18, and the strip is stopped when the etfective limit of the stroke of pawl 183 has been reached. Immediately thereafter, the rear end of lever 88is forced upwardly by cam 94 and, through rocker arm 44, effects rotation of gear wheel 42 clock-wise (as viewed in Fig. 3). This causes rack 46 to move downwardly, carrying with it the yoke 52, the pressure member 74, the longitudinal shear blades 11.30 and the transverse shear blade 148. The upper surface of support member 64 and the lower surface of pressure member 74 contact the under side of tear tab strip 23 and the top side of the web 2.2, respectively, when they come together, the end of support member 64 projecting through slot 32 in plate 18. At this point, by reason of the spring '76, both members 64 and 74 move upwardly a short distance, carrying with them the web 22 and the tear tab strip 28 clamped together between the two members. However, the yoke 52 continues to move downwardly, carrying with it the rigid shear blades 13% and 148. These blades press the edge of the web and the tear tab strip downwardly through adjacent slots in the surface of the base into contact with the hinged shear blades 114 and 136 and complete-the operation of slitting the edge of the web, as shown at 23 (Fig. and severing a tear tab 23'!) from the strip 28. As hereinbefore explained, the tear tab will be sealed to the web by pressure of the members 64 and 74, irrespective of whether heat is applied through. a heating element.

The narrow slots 30 in the plate 18, for admitting passage of the upper shear blades 130, and the narrow space between the support 64 and the front edge of guide plate 24 leave the maximum amount of surface for support of the web and tear tab strip, and also permit a minimum distance of travel of the web and tear tab strip toward the shear blades mounted on the base, which greatly aids in performing the shearing operations without distortion of and wrinkling of the web and tab. The solidity of the supporting arrangement insures clean slitting of the edges of the web and severing of tear tabs from the tear tab strip.

As previously explained herein, the shear blades 114 and 136 mounted on the base 10 are hingedly mounted and urged outwardly under spring tension which may be adjusted to impose such shearing tension against the upper shear blades 13% and 143 as may be necessary for diiferent kinds and thicknesses of material used in the web and tear tab strip.

Various modifications or changes in the construction and arrangement of parts in the mechanism shown and described in the foregoing specification may be made within the scope of the present invention, and it is therefore to be understood that the embodiment of the invention shown in the drawings is illustrative only, and not restrictive thereto.

I claim:

1. A mechanism for applying tear tabs to a movable web or wrapping material comprising a base having an outer surface to support said web, adjustable means for advancing a tear tab strip a predetermined distance across said web, a yoke slidably mounted on said base, a pressure member slidably mounted on said yoke, spring means urging said member toward said base, a support member slidably mounted on said base in opposed alignment with said pressure member, said members being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said members toward the other to clamp said tear tab strip to said web, and cooperating shear elements carried by said base and said yoke for slitting the edge of said web on each side of said strip and for severing tear tabs from said strip.

2. A mechanism for applying tear tabs to a movable web of wrapping material comprising a base having an outer surface to support said web, adjustable means for advancing a tear tab strip a predetermined distance across said web, a yoke slidably mounted on said base, a pressuremember slidably mounted on said yoke,.spring means urging said member toward said base, a support member slidably mounted on said base'in opposed alignment with said pressure member, saidmember being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said members toward the other to clamp said tear tab strip to said web, shear blades hingedly mounted on said base, and cooperating blades rigidly carried by said yoke for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip.

3. A mechanism for applying tear tabs to a movable web of wrapping material comprising a base having an outer surface to support said web, said surface having slots therein adjustable means for advancing a tear tab strip a predetermined distance across said web, shear blades mounted on said base below and in registry with said slots, a yoke slidably mounted on said base, a pressure member slidably mounted on said yoke, spring means urging said member toward said base, a support member slidably mounted on said base in opposed alignment with said pressure member, said members being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said members toward the other to clamp said tear tab strip to said web, and blades carried by said yoke cooperative through said slots with the shear blades mounted on said base for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip.

4. A mechanism for applying tear tabs to a movable web of wrapping material comprising a basehaving an outer surface to support said web, said web supporting surface having slots therein, adjustable means for advanc ing a tear tab strip a predetermined distance across said web, shear blades hingedly mounted on said base below and in registry with said slots, spring means urging the free ends of said blades outwardly on a slight yieldable bias with adjacent edges of said slots, ayoke slidably mounted on said base, a pressure member slidably mounted onsaid yoke, spring means urging said member toward said base, a support member slidably mounted on said base in opposed alignment with said pressure member, said members being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said members toward the other to clamp said tear tab strip to said web, and blades aligned with said slots and rigidly carried by said yoke cooperative through said slots with the shear blades mounted on said base for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip.

5. A mechanism for applying tear tabs to a movable web of wrapping, material comprising a base having secured thereto a relatively thin cover plate forming an outer surface to support said web, said plate having slots therein, adjustable means for advancing a tear tab strip a predetermined distance across said web, shear blades mounted on said base below and in registry with certain of said slots, a yoke slidably mounted on said base, a pressure member slidably mounted on. said] yoke, spring means urging said member toward said plate, a support member slidably mounted. on said base in opposed alignment with said pressure member, said support member being also in registry with one of said slots in said plate, said pressure member and support member being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said" members toward the other to clamp said tear tab strip to said web, and blades carried by said yoke cooperative through said .slots with the shear blades mounted on said base for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip.

6. A mechanism for applying tear tabs to a movable web of wrapping material according to claim 1 and including means for heating said support member slidably mounted on said base.

75A mechanism for applying tear tabs to a movable webgof wrapping material comprising means for advancing a tear tabystrip a predetermined distance across said web," adjustable means for limiting the advance of said strip, adjustable means for longitudinally tensioning said strip, means for lifting the front edge of said web to permit passage of said tear tab strip back of said web, means for pressing said tear tab strip to said web, and means cooperative with said pressing means for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip.

8. A mechanism for applying tear tabs to a movable web of wrapping material comprising a base having an outer surface to support said web, adjustable means for limiting the advance of said strip, a yoke slidably mounted on said'base, a pressure member slidably mounted on said yoke, resilient means urging said member toward said base, a support member slidably mounted on said base in aligned opposition to said pressure member, said members being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said members toward the other to clamp said tear tab strip to said web, and cooperating shear elements carried by said yoke and said base for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip.

9. A mechanism for applying tear tabs to a movable web of wrappingmaterial comprising a base having a flat surface to support said web,said supporting surface having slots therein, adjustable means for advancing a tear tab strip a predetermined distance across said web, means on the front end of said surface for lifting the front edge of said web to permit passage of said tear tab strip back of said web through said slots, shear blades hingedly mounted on said base below and in registry with said slots, a yoke slidably mounted on said base, rigid blades carried by said yoke, said rigid blades being cooperative through said slots with the shear blades mounted on said base for slitting the edge of said web on each side of said tear tab strip and for severing tear tabs from said strip, a pressure member slidably mounted on said yoke, 21 support member slidably mounted on said base in opposed alignment with said pressure member, and means for simultaneously moving each of said members toward the other to clamp saidtear tab strip to said web.

10. A mechanism for applying tear tabs to a movable web of wrapping material according to claim 9 in which each of said shear blades hingedly mounted on the associated said shear base is provided with spring means at its free end urging said blade outwardly on a yieldable bias with the blades carried by said yoke to effect a positive shearing action on said tear tab strip and said web.

- 11. A mechanism for applying tear tabs to a movable web of wrapping material comprising a base having an outer surface to support said Web, adjustable means for advancing a tear tab strip a predetermined distance across said web, a first shaft journaled transversely of said base, a rocker arm fixedly mounted on said first shaft, cam means for intermittently moving said arm in alternate directions, a second shaft journaled transversely of said base, a yoke above said base, a gear wheel fixedly mounted on said second shaft, a first rack member meshing with one side of said wheel andconnected to said yoke at its upper end, a pressure member slidably mounted on said yoke, spring means urging said pressure member toward said base, a support member slidably mounted on said base in opposed alignment with said pressure member, a second rack member meshing with the opposite side of said gear wheel and connected to a support member, said cam means normally holding said pressure member and support member in spaced relation to receive said web and tear tab strip therebetween, shear blades mounted on said base below said web and tear tab strip, and cooperating blades carried by said yoke, said gear wheel and rack connections providing means for moving said pressure member and said support member simultaneously toward each other to clamp said tear tab strip to said web and also to slit the edge of said web on each side of said tear tab strip and to sever tear tabs from said strip.

12. A mechanism for applying tear tabs to a movable web of wrapping material according to claim 11 in which the shear blades mounted on said base are hinged thereto at one end and are provided with spring means at their face ends for urging said blades outwardly on a yieldable bias with the blades carried by said yoke.

13. A mechanism for applying tear tabs to a movable web of wrapping material according to claim 11 in which the shear blades for slitting the edge of said web are hingedly mounted on supports on said base, which supports are adjustable at the free ends of said blades toward and from the edge of said tear tab strip, and in which the shear blade for severing tear tabs from said tear tab strip is hingedly mounted on a support on said base, which latter support is adjustable at the free end of said last named blade toward the vertical plane of the cooperating blade carried by said yoke.

14. A mechanism for applying tear tabs to a movable web of wrapping material comprising a base having an outer surface to support said web, adjustable means for advancing a tear tab strip a predetermined distance across said web, a mounting member slidably mounted on said base, a pressure member slidably mounted on said mounting member, spring means urging said pressure member toward said base, a support member slidably mounted on said base in opposed alignment with said pressure member, said pressure and support members being normally spaced apart to receive said web and tear tab strip therebetween, means for simultaneously moving each of said pressure and support members toward the other to clamp said tear tab strip to said web, and cooperating shear elements carried by said base and said mounting member for slitting the edge of said web on each side of said strip and for severing tear tabs from said strip.

References Cited in the file of this patent UNITED STATES PATENTS 855,039 Baron May 28, 1907 2,056,825 Clark Oct. 6, 1936 2,105,726 Fries Jan. 18, 1938 2,106,204 Burnell et al Jan. 25, 1938 2,190,189 Neumair Feb. 13, 1940 2,268,474 Chalmers Dec. 30, 1941 2,271,345 Repass Jan. 27, 1942 2,293,433 Gautier Aug. 18, 1942 2,418,545 Zimmerman Apr. 8, 1947 2,493,411 Lanegan et al Jan. 3, 1950 2,509,650 Oakhill May 30, 1950 2,531,913 Kaim Nov. 28, 1950 2,541,737 Bardsley et al Feb. 13, 1951 2,634,973 Hahn Apr. 14, 1953

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