US2525735A - Log loader - Google Patents

Description

Oct. 10, 1950 i R. c. sYMoNs 2,525,735

Los LOADER Filed Feb. s. 194s' Y s sheets-sheet 1 FIG I.

` INVENTOR Raaf/P7' c? .Sfr/vanaf ATTORN Y Patented Oct. 10, 1950 UNITED STATES PATENT OFFICE 15 Claims.

This invention relates to log loading equipment or the like, and more in particular to a i log loading device which is mounted onto a truck or the like and is adapted to lift logs from the ground onto a bed or deck and which utilizes power from a motor such as the internal combustion engine of the truck.

An object of this invention is to provide an improved log loader which is of simplied and yet sturdy construction and which is efcient and dependable in operation. Another object is to provide an improved gear reduction and drive arrangement. Another object is to provide an improved winch or windlass. A further object is to provide apparatus of the above character which is adaptable for uses under a wide variety of conditions. A still further object is to provide apparatus of the above character which is inexpensive to manufacture, maintain, and operate. These and other objects `will be in part obvious, and in part pointed out below.

The invention accordingly consists in the features of construction, combinations of elements,

and arrangements of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the drawings:

Figure 1 is a perspective view of one embodi` Figure 4 is an end plan view of the gear reduc` tion and clutch assembly of Figure 1;

Figure 5 is a fragmentary perspective view of the brake applying structure of Figure 5; and

Figure 6 is a sectional view on the line 6 5 of Figure 4:.

Referring particularly to Figure 1 of the drawings there is shown the rear portion of a truck 2 having an open rack 3 with uprights'i adapted to hold a load of logs. Mounted on the side of the truck is a loading frame 6 which `has two loading arms 3 and a cross-frame structure ii). Each of the main loading arms has a right-angle extension i by means of which the loading arm is hinged to the truck rack 3 and a main arm or longitudinal portion 5 which has at its free end e. log-receiving portion S. This log-receiving portion E! is formed by `an upwardly-curved end bracket il and an angle-bracket i3 which. form somewhat of a, channel within which the logs lie during the log lifting operation. That is, the logs are rolled over the end extensions 9 of the two lifting arms against the angular brackets I3 and the two arms cooperate to provide support for the logs. p

Each of the right-angle extensions 'I is formed by a channel I2 and an angle plate It welded thereto. A triangular reinforced plate I5 is welded to channel l2 and the adjacent portion of arm `li and holds these members rigidly together. Each-of the loading arms is hinged to the underside of truck rack 3 by its hinge plate i4 which is positioned between a pair of mounting plates IB and is held by a removably pintle bolt IS extending through the plates. are welded to an angle bracket 2l! bolted to the truck rack and spaced from the edge of the truck rack as shown so that the loading frame is pivoted about an axis positioned directly beneath the truck rack and spaced a substantial distance from the edge of the rack. With this pivot axis thus positioned the loading frame swings from the full line position of Figure 2 wherein the main arms are substantially horizontal to the vertical position shown in broken lines directly at the side of the truck rack. Y

The lifting frame is raised by means of a cable 22 which is connected to the cable drum 23 of a winch or windlass 24 which is mounted slightly to the right of the center of the truck rack. Cable 22 extends over a pair of pulleys 2t and 28 which are carried by an upright frame vertical angle bars 3i. Bar 32 carries a pair of downwardly projecting. pins 36 which project' through holes in ear brackets 38 fixed to the truck rack. The upright frame is reinforced by a pair of plates 40 and the entire assembly is welded together so as to forma lightweight rigid construction. Angle bars 34 carry `U-shaped cable guards 42 adjacent the pulleys which prevent the cable from slipping of the pulleys. Frame 3i] is held in the upright position shown by a chain M ccnnectedat `one end through a clevis 455 to a bracket :i8 held by bolts 41 to the truck frame, and (see Figure 3) connected at the other end through a key hole and slot 49 in one of angle bars 34.

Cable 22 is attached to the loading frame ii `by a loop on the end of the cable which is received by a hook 59 (see also Figure 3) welded to the center of the cross-frame structure i0. The cable extends from `the lifting frame over the top of pulley 26 (Figure-2) and thence downwardly and Plates I6 beneath pulley 28 and to the left to drum 23 (see Figure 6). The end of the cable is connected to the drum by a pair of U-clamps 52 (only one of which is shown) the ends of which project through holes in an end ange on the drum and are held by nuts 54. Thus with the lifting frame in the full line position of Figure 2 the turning of drum 23 winds the cable onto the drum and swings the lifting frame to the upright position shown in broken lines.

As indicated above, drum 23 is part of a winch or windlass 24 which is driven from the truck motor and which includes a gear and brake assembly which is somewhat of the planetary gear type and which acts as a clutch. The arrangement is such that when the brake is released drum 23 remains stationary, and when the brake is applied this drum is rotated. Drum 23 includes a pair of cylindrical end anges 53 and 55, and a cylindrical member 51 upon which the cable is Wound; the drum members are welded together, and in turn welded to a shaft 56. Shaft 55 is supported at the right by a bracket 58 having a bearing 65', `and at the left by a bracket 60 having a bearing 51. At the left end of shaft 56 and in alignment therewith is a shell 62 which is mounted at the right in bracket 50 through a mounting sleeve |56 welded to the shell and a bearing 88. The bearing sleeve has a radial groove 69 into which a correspondingly shaped ridge on bearing 68 fits so as to hold the members in alignment, and sleeve and bearing |58 surround bearing 88 and shaft 56, thus to provide concentric support for shell 62 and the shaft.

Shell 62 is formed by two disc members or side Walls 6| and 53, and a cylindrical member 59. Member 6| is welded at its periphery to member 59 and member 53 is clamped to member 59 with an oil tight seal by a plurality of bolts 65. Shell 62 is supported at the left by a mounting sleeve 12 welded to the shell and journaled by a bearing 14 in a bracket 54. Brackets 58, |50 and 64 are supported at the sides of the winch by a pair of angle bars (see also Figure 4) 13 and 15. Journaled within mounting sleeve 12 in alignment with shaft 56 is a drive shaft 18 which has a sleeve bearing 15. At the left-hand end of mounting sleeve 12 there is an oil seal 11, and at the righthand end of mounting sleeve 66 is a similar oil seal 19;

The right-hand end of drive shaft 18 projects into shell 52 and has integral with it a gear 8|), and the adjacent end of shaft 5S has keyed to it a gear SS. The adjacent ends of shafts 18 and 56 are held in spaced relationship by a washer 86 which is held in place by an extension S2 on the end of shaft 55, and there is a cylindrical recess in the adjacent end of shaft 18 which avoids direct contact between the ends of the shafts. At the left of gear Bil is a washer 81, and at the right of gear 86 is a Washer 88', and these washers hold the gears from contact with the sides of the shell.

As shown in the upper portion of Figure 6, shell 62 also encloses a pair of gears 9!) and 92 which mesh respectively with gears 86 and 85. Gear 99 has a cylindrical extension 9| upon which gear 92 is keyed and the two gears are mounted through a sleeve bearing 93 upon a shaft 95 with there being washers 95 and 91 at the ends of the sleeve bearing to hold the gears from the sides of the shell. The right-hand end of shaft 94 projects into an opening 99 in member 53 of the shell and this provides a snug support for the shaft. A similar snug support is provided for the left-hand end of shaft by an opening |00 in member 5| of the shell. The left-hand end of shaft 94 projects from the shell and has an in tegral flange 95 which is clamped to member 5| with an oil-tight seal by a plurality of stud bolts 98. At the right-hand end of shaft 94, opening 99 is closed by a sealing disc |02 over which a cover plate |04; is held by stud bolts IGS.

Shell 52 provides an oil-tight casing for the gears, and at the same time forms with the gears a gear-reduction and clutch assembly. Thus, if the shell is hel-d stationary, the rotation of shaft 18 is transmitted through gears S0, S2, 95 and 36 to shaft 56 with there being approximately a sixto-one reduction in the speed of rotation. And, if shell 52 is permitted to rotate and shaft 55 resists rotation, thenI the rotation of shaft 18 causes gear 92 to tra'verse the periphery of gear 86 and this causes shell 52 to rotate. As indicated above, a brake is provided so that shell G2 may be stopped as desired; therefore, when the brake is released the shell rotates freely with the result that drum 23 does not turn, but when the brake is applied the rotation of the shell is stopped and then drum 23 is rotated by a direct gear drive.

The brake is formed by a brake band I9 having a brake lining ||2 which engages the cylindrical braking surface of the shell which is the outer surface l of member 59. As shown best in Figure 5, brake band Il@ is fixed at one end to the supporting angle bar 15 and at the other end to a draw rod H5. Draw rod H5 is threaded at its right-hand end and projects through a diametrical hole in a cylindrical operating pin |58. A pair of sleeves |25 and |22 are held into engage ment with the opposite sides of pin IIS by nuts |24 threaded onto rod M5. Pin H8 is rockably carried (see also Figure 5) by a pair of rectangular operating blocks |25 which have a pin |28 l, projecting through holes in their upper ends; the

blocks are clamped to the pin by bolts 21 and the pin is rockably mounted in a pair of xed brackets |30. Welded to one end of pin .|28 is a brakeapplying lever 32 which is normally biased down wardly (clockwise in Figure 4) by a coil spring lii one end of which engages the lever and. the other end of which engages angle bar 15. Thus a brake-applying crank is formed by blocks |25, pin |28, and lever |32, and spring |34 normally acts through this crank to urge rod i i8 to the left (Figure 5) so as to release the brake from shell 62. The brake is applied by lifting arm |22 so as to swing the arm counter clockwise (Figure 5) thus to pull rod I5 to the right; this action tightens brake band Il upon the shell and tends to prevent rotation of the shell,

Lever |32 may be raised to apply the brake by pulling a cable |36 which has a loop at its end extending through a hole in lever |32 and which extends upwardly and thence through a pulley |38 in a generally horizontal direction. As shown in Figure l, cable |35 extends forwardly beneath the truck rack and is connected at the forward end of the rack to a lever |38. Lever |38 is welded to an operating bar |553 which is mounted on the truck rack by three brackets Mi and extends substantially the width of the truck with an operating handleV M2 at each of its ends. These handles normally project downwardly and when the operator wants to operate the winch he swings one of the handles forwardly of the truck and this action is transmitted through lever |353A to cable |35 so that (see Figures 4 and 5) the brake-applying lever |32 is raised and the brake is applied.

It has been indicated above that power is transmitted to drive shaft IB of the winch from the truck motor; for this purpose a winch clutch (not shown) is provided at the motor which provides continuous rotation of shaft 18 when the winch clutch is engaged. Drive shaft IB (see Figure 1) is connected through a universal joint |43 to a shaft |45 which extends forwardly of the truck and is supported by a bracket |4`| bolted to the truck frame. Shaft |45 is connected at its forward end through a universal joint |49 tol a shaft |5| which is in turn connected to the winch clutch referred to above. During the log loading operation it is desirable to provide for control of the truck motor by the operator. Accordingly, adjacent rod |43 is a similar rod |44 which is rookably mounted on the truck frame by a pair of brackets |44 and which has at each end a control handle |48. Near the center of rod |44 is a lever |50 to 'which a throttle control rod |53 is connected. Thus, an operator may engage the winch clutch so as to start the rotation of shafts |5|, |45 and '18; then he can control the raising of the loading frame 6 from either side of the truck and he has simultaneous control over the truck motor.

In this embodiment of the invention the lifting action of the winch is stopped automatically at the time the loading frame 5 reaches its fully elevated position. For this purpose the loading frame has a brake-releasing arm |52 (see also Figure 2) which is welded to one side of the loading arm adjacent hinge plate I4. Brake releasing arm |52 is connected through a cable |54 to cable |35:` (Figure l) by a cable clip at |53, and cable |54 extends through a ring loop bracket |53 so that its end runs substantially parallel to cable 33. As the lifting frame moves toward the broken line position of Figure 2, arm |52 swings toward th-e side,` of the truck and this pulls cable |54. The length of cable |54 is such that it tightens up and exerts a brake-releasing pullon cable |36 at the time the loading frame approaches the broken line position of Figure 2. That is, as the lifting frame approaches this broken line position, arm' |52 pulls cable |54 and the force is exerted through cable |36 to lever |33 so as to swing this lever rearwardly of the truck and so as to move handles |42 back to their rest position. Therefore, the manual force exerted by the operator to apply the brake and operate the winch is overcome so that the brake is released and the winch no `longer rotates drum 23; thus, the drum is free to rotateby a pull on cable 22. By this time the log or logs on the loading frame have been thrown or dropped into the truck rack, and the weight and mounting of the loading frame are such that cable 22 is unwound from drum 23 and the loading frame starts to descend immediately to the full line position of Figure 2, In practice it has been found that an operator can load logs very rapidly because he can lift the loading frame at maximum speed and can rely upon the brake-releasing mechanism to stop the lifting operation when the loading frame is fully elevated. The releasing of the brake in this manner may be regulated by adjusting the length of cable |54, and in this way the varied demands of actual use may be met. It has been found that a skilled operator can manipulate control handles |42 and |48 in such a way as to load logs very rapidly and he can even position the logs on the truck rack as he desires by varying the speed of the motor dur ing the lifting movement.

The lifting frame may be mounted on either side of the truck and for this purpose duplicate brackets I6, 38 and 48 are provided for the loading frame 6, the upright frame 3i) and chain 44, and a brake-releasing arm |52 is provided on each `of the loading arms 8. Thus when the operator wishes to load logs from the opposite side of the truck he rst disconnects chain 44 from frame 30 and unhooks cables 22 and |54 from the loading frame 6. The loading frame is then disconnected by removing the two bolts i8 and is carried around to the other side of the truck., and the frame is held with the hinge plates I4 in their respective positions between the plates I6 while bolts I3 are inserted. Lifting frame 3Q is then lifted up so as to withdraw pins 35 from' brackets 38 and this frame is moved to the other side of the truck and pins 35 are inserted in the other pair of brackets 38; this may be done without removing cable 22 from pulleys 23 and 28. Chain 44 is then connected to the other bracket 43 by taking clevis 46 apart, and the chain is then attached at its free end to fram'e 3Q so as to hold the frame in upright position. Cable |54 is reattached to the arm |52 upon the loading arm which is at that time positioned forwardly of the truck rack. Cable 22 leads olic from the bot* tom of drum 23 and with the arrangement of parts as shown the cable extends freely to pulley 28. Thus minimum effort is involved in adapting the apparatus from operation at one side of the rack to operation at the other side of the rack.

During movement of the truck from one posin tion to another, the lifting frame is held in the upright position shown in broken lines in Figure 2 by a chain l5!) on the top of frame 30 which the operator connects (see Figure 3) in a key hole opening |53 in a bracket |62 on the loading frame. In the illustrative embodiment rack 3 is of the so-called open type so that cable 22 can extend from drum 23 to pulley 23. Hoirrever, when the truck rack has a closed bed, pulley 'i8 is moved to a lower position indicated in broken lines and having its mount-ing pin positioned in a hole |63. When pulley 28 is in this lower posi tion cable 22 extends beneath the truck rack (Figure 2) as indicated in broken lines. Referring to Figure 6, drum `23 is provided with a cable guard |64 which holds the cable from jumping off the drum. The winch is enclosed in a sheet metal casing which has been generally omitted to show the working parts.

As many possible embodiments may be made of the above invention and as many changes` might be made in the embodiment above set forth, it is to be understood thataall matter hereinbefore set forth, or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. Ina log loader of the type which may be mounted `on a carrying rack or the like, the combination. of, a rigid unitary loading frame asf sembly which is swingably mounted to be elevated from a horizontal log-receiving position wherein it is adapted to receive logs beneath the level of the rack to a substantially vertical leg discharging position wherein it deposits the logs its elevated position and effective to render the power unit inoperative.

2. In a log loader of the character described, a loading frame comprising, a pair of parallel arms which are adapted to swing from a substantially horizontal position wherein the logreceiving end of the arms receives logs to a substantially vertical position wherein the log-receiving end of the arms is elevated above the level of a rack thereby to lift logs from the ground onto the rack, and a pair of pivot members respectively connecting said loading arms to the rack along an axis which is spaced substantially from the adjacent edge of the rack and substantially at the level thereof, said pivot members projecting downwardly from said axis when said arms are in said substantially horizontal position.

3. In apparatus of the character described, the combination of, a rack which is adapted to have logs loaded thereon, a loading frame having a Y;

main longitudinal portion and a transverse portion, pivot means connected to said longitudinal portion and connecting said loading frame to the underside of said rack along a pivot axis spaced substantially from the side edge of the rack, said main longitudinal portion being adapted to swing about said pivot axis between a horizontal position and a vertical position at the side of the rack, a cable and pulley assembly which is adapted to lift said main longitudinal portion of the loading frame from its horizontal position to its vertical position, a winch which is adapted to wind up said cable thereby to perform the above-mentioned lifting operation, an operating member which is moved to render said winch operative, and releasing means attached to said loading frame and adapted to render said winch ineffective when said main longitudinal portion of the loading frame reaches its vertical position.

e. In apparatus of the character described, the combination of, a rack which is adapted to have logs loaded thereon., a loading frame having a main longitudinal portion and a transverse portion, pivot means connected to said transverse portion and connecting said loading frame to the underside of said rack along a pivot axis spaced substantially from the side edge of the rack and at substantially the level thereof, said main longitudinal portion being adapted to swing about said pivot axis between a horizontal position and a vertical position at the side of the rack, a cable and pulley assembly which is adapted to lift said main longitudinal portion of the loading frame from its horizontal position to its vertical position, a winch which is adapted to wind up sa'idcable thereby to perform the above-mentioned lifting operation, and an operating member which is moved to stop the winding up of the cable on said winch.

5. In apparatus of the character described, the combination of, a rack which is adapted to have logs loaded thereon, a loading frame having a main longitudinal portion and a transverse portion, pivot means connected to said transverse portion and connecting said loading frame to the underside of said rack along a pivot axis spaced substantially from the side edge of the rack, said main longitudinal portion being adapted to swing about said pivot axis between a horizontal position and a vertical position at the side of the rack, a cable and pulley assembly which is adapted to lift said main longitudinal portion of the loading frame from its horizontal position to its vertical position, and a winch having its winding axis substantially parallel to said pivot and adapted to wind up said cable thereby to perform the above-mentioned lifting operation.

6. In a log loader of the type which may be mounted on a truck or the like, the combination of, bracket means adapted to be mounted along the underside of the truck rack and providing a pivot along a pivot axis substantially spaced from the adjacent edge of the truck rack, a loading frame comprising a pair of loading arms each of which has a right-angle portion pivoted at one end to said pivot means and adapted to swing between a substantially vertical position directly beneath said pivot axis and a substantially horizontal position along the underside of the truck rack adjacent said edge, each of said loading arms also including a longitudinal member rigidly connected at one end to saicl rightangle portion and adapted to swing with said right-angle portion from a horizontal position at a substantially lower level than the Atruck rack to a vertical position at the side of the truck rack, an upright frame mounted on the edge of the truck rack substantially equal distances from the two loading arms and projecting upwardly therefrom and having vertical pins projecting downwardly through retaining recesses at the level of the truck rack, and a pulley mounted in the top of said upright frame and adapted to carry a cable or the like for elevating said loading frame.

7. In a log loader of the type which may be mounted on a truck or the like, the combination of, bracket means adapted to be mounted along the underside of the truck rack and providing a pivot along a pivot axis spaced a predetermined distance from the adjacent edge of the truck rack which predetermined distance is substantially greater than the distance which said axis is below the level of the truck rack, and a loading frame comprising a pair of loading arms each of which has a right-angle portion pivoted at one end to said pivot means and of a length substantially equal to said predetermined distance and adapted to swing between a substantially vertical position directly beneath said pivot axis and a substantially horizontal position along the underside of the truck rack adjacent said edge, each of said loading arms also including a longitudinal member rigidly connected at one end to said right-angle portion and adapted to swing with said right-angle portion from a horizontal position at a substantially lower level than the truck rack to a vertical position at the side of the truck rack.

8. In a log loader of the character described, a loading frame comprising, a pair of loading arms each of which comprises an elongated arm member and a right-angle member connected at one end to one end of said arm member with the right-angle member being adapted to provide at its end opposite the arm member a pivotal mounting whereby the arm member may swing about a pivot substantially above the level of the ground and move between a substantially horizontal position and a substantially vertical position,

9. In apparatus of the character described, a winch comprising, a drum which is adapted to have a cable or the like wound thereon, a driven shaft connected to said drum Vand providing a mounting means therefor, a substantially cylindrical shell having one end of said driven shaft projecting into one side thereof in coaxial alignment therewith, a drive shaft projecting into the 1 9 other side of said shell in coaxial alignment therewith, a plurality of gears within said shell providing a gear reduction train connecting said shafts and including a pair of gears rotatably mounted on an axis parallel to the axis of said shell and displaced therefrom whereby the rotation of said drive shaft exerts a moment tending to rotate said shell and said driven shaft is not rotated if said shell is permitted to rotate freely, and a brake which may be operated to prevent the rotation of said shell.

10. Apparatus as described in claim 3 wherein said winch includes, a rotatable shell which presents a cylindrical braking surface and has axial openings in its side walls, a pair of shafts positioned coaxially with their ends in said openings, one of said shafts being a driving shaft and the other being a driven shaft, a pair of gears fixed respectively to the adjacent ends of said shafts within said shell, and gear means within said shell mounted on an axis which is fixed with respect to said braking surface, said gear means providing a driving gear connection between said gears.

11. Apparatus as described in claim 10 wherein said gears are of different sizes and said gear means comprises a rigid gear assembly formed by gears of different sizes and meshing respectively with said pair of gears, and wherein said apparatus includes a brake extending around said braking surface and presenting a mating surface, and means urging said brake into braking relationship with said braking surface.

1,2. In apparatus of the type described which may be mounted on a rack, the combination of,

bracket means adapted to be mounted on the rack and provide a pivot along a pivot axis substantially spaced from the adjacent edge of the rack, a loading frame which has a right-angle portion adapted to be pivoted at one end to said pivot means and thus being mounted to swing between a substantially vertical position directly beneath the pivot axis and a horizontal position along the underside of the rack adjacent said edge, said loading frame also including a longitudinal portion rigidly connected at one end to said right-angle portion and adapted to swing with said right-angle position from a horizontal position at a substantially lower level than the rack to a vertical position at the side of the rack, an upright frame adapted to be mounted on said edge of the rack substantially centrally of said loading frame and projecting upwardly therefrom, and apulley mounted on the top of said upright frame and adapted to carry a cable or the like for elevating said loading frame.

13. In apparatus of the character described for use in loading logs or the like onto a rack which has a space for the logs which is substantially greater in longitudinal dimension than in width, a loading frame `having a main longitudinal portion and a transverse portion, pivot means for connecting said main longitudinal portion to the underside of the rackwhereby the loading frame is pivotally mounted on an axis which extends parallel to the longitudinal dimension of the rack with the main longitudinal portion being adapted to swing about said pivot axis between a horizontal position wherein it projects outwardly from the side of the rack and a vertical position wherein it projects upwardly at the side of the rack, a cable and pulley assembly adapted to lift said loading frame from a rest position to its elevated position wherein said main longitudinal portion is in its vertical position, winch means to wind said cable thereby to perform the above-mentioned lifting operation, and control means for said winch means comprising an operating lever which is swung from a rest position to render said winch means operative to wind up the cable and releasing means which comprises a cable and pulley means with the cable attached at one end to the loading frame whereby it is pulled during the elevating of the loading frame and having its other end connected to said operating lever and to transmit the movement of the loading frame to the operating lever to move the same to said rest position.

14, Apparatus as described in claim 13 wherein said winch means comprises, mounting means including three bearings positioned in axial alignment and spaced from one another, a first shaft rotatably mounted in two of said bearings and having a free end projecting toward the other bearing, a second shaft rotatably mounted in the other of said bearings and having a Ifree end projecting toward said free end of said rst shaft, a rotatable shell enclosing the adjacent ends of said shafts and rotatably mounted with respect to said shafts, means interengaging said shafts and said shell, means integral with said shell and presenting a braking surface, brake means which is adapted to engage said braking surface and resist rotation of said shell, and reel means mounted on said rst shaft between its bearings and adapted to have the cable wound thereon which is attached to said loading frame, said brake means being normally disengaged but being engaged when said operating lever is swung from said rest position.

15. Apparatus as described in claim 14 wherein said brake means includes a band brake and spring means to release said band brake, and a lever forming part of said control means and adapted when swung to act to overcome said spring means and tighten said band brake.

ROBERT CHARLES SYMONS.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,661,307 Rosendahl Mar. 6, 1928 1,945,426 Evoy Jan. 30,1934 2,033,243 Jester Mar. 10, 1936 2,161,734 Wheless June 6, 1939 2,203,310 Shonnard ..1 June 4:, 1940 2,359,287 Bouffard Oct. 3, 1944 FOREIGN PATENTS Number Country Date l 97,891 Sweden Nov. 23, 1939 375,266 `Germany May 11, 1923

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