US2915313A - Ball and pin handling mechanism - Google Patents

Description

Dec. 1, 1959 a. A. MONTOOTH BALL AND PIN HANDLING MECHANISM Original Filed Nov. 24, 1954 3 Sheets-Sheet 1 INVENTOR. r eQ/VanZZoflp,

BY KM, Mfr-M G. A. MONTOOTH BALL AND PIN HANDLING MECHANISM Original Filed Nov. 24, 1954 Dec. 1, 1959 3 Sheets-Sheet 2 INVENTOR. Ge ar eCZ/Vonofi,

"IIWI/ Dec. 1, 1959 c;. A. MONTOOTH 2,915,313

BALL AND PIN HANDLING MECHANISM Original Filed Nov. 24, 1954 3 Sheets-Sheet 3 JNVENTOR.

United States Patent BALL AND PIN HANDLING MECHANISM George A. Montooth, Lon Beach, Calif., assignor to The Brunswick-Balke-Collender Company, a corporation of Delaware Original application November 24, 1954, Serial No. 471,012. Divided and this application February 12,

1957, Serial No. 639,698

13 Claims. (Cl. 273-43) This invention relates to a ball and pin handling mechanism for use with an automatic pin setter in the pit of a bowling alley.

It is a general object of the invention to provide a new and improved ball and pin handling mechanism.

It is a more specific object of the invention to provide a new and improved ball and pin separating mechanism wherein balls and pins are directed to a ball elevating mechanism which serves to elevate the ball from the floor of the alley pit, leaving the pins to pass rearwardly to a pin elevating mechanism.

Another object of the invention is to provide a ring-type rotating pin elevator disposed across the rear of a bowling alley pit having members thereon for elevating pins to a discharge position and a ring-type rotating ball elevator extending across the alley pit immediately in front of the pin elevator for engaging a bowling ball and, in associa tion with vertically arcuate tracks disposed within the periphery of the ball elevator, elevating the ball to a discharge track, the ball elevator in effect filtering the ball away from the pins as the latter are moved to a position to be elevated by the pin elevator, the ball elevator also functioning to disperse grouped pins engaged thereby and to align the pins with their axes extending generally in the direction of pin travel afforded by the pin elevator.

A further object is to provide a new and improved pin handling mechanism including a pin elevator disposed in a bowling alley pit, and a rotatable, vertically disposed ring-shaped element having a lower portion in the path of pins moving toward the pin elevator so that pins are directed thereacross in passage to the pin elevator to be dispersed by the rotating ring-shaped element.

The objects of the invention generally set forth, together with other ancillary advantages, are attained by the construction and arrangement shown by way of illustration in the accompanying drawing, in which:

Fig. 1 is a perspective view in elevation of the ball and pin elevating mechanism as mounted in a bowling alley;

Fig. 2 is a perspective view in elevation of the mechanism shown in Fig. 1 with the ball elevating mechanism removed;

' Fig. 3 is a fragmentary perspective view in elevation of the mechanism shown in Fig. 2 and particularly the mechanism for resetting the pin-engaging paddle members;

Fig. 4 is a vertical view in section of one of the pinengaging paddle members showing the latch mechanism for holding the paddle member in its extended pinengaging position; and,

Fig. 5 is a diagrammatic end view in elevation of the ball elevating mechanism showing a ball engaged between the annular ball-elevating member and the spacedapart track members looking toward the mechanism from the left-hand end of Fig. 1.

, While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail an illustrative embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to the embodiment illustrated. The

scope of the invention will be pended claims.

My improved pin and ball elevating mechanism may be mounted at the rear of a pit having side walls one of which is indicated at 1 and a pit floor formed of a plurality of moving belts 2, 3 and 4. Reference may be had to my Patent No. 2,729,449, granted January 3, 1956, for a complete disclosure as to the construction and drive for these belts. The belts 2 and 4 are moved in a manner whereby their upper reaches move toward the middle belt 3, the upper reach of which moves toward the rear of the pit. Thus, it will be seen that pins and a ball will be pointed out in the apdirected to the rear of the pit at a point or position approximately mid-way between the sides thereof.

As shown in Figs. 1 and 2, a vertically-disposed framework is formed from one set of connected channel members 5, 6, 7, 8, 9 and 10 which are interconnected with another set of connected channel members 11, 12, 13, 14, 15, and 16, the two sets of channel members being reenforced by cross members such as 17 and 18 and being interconnected by channel members 19, 20, 21 and 22. Rotatably mounted within the framework is a ball elevating mechanism which is in the form of a rotatably mounted ring-shaped or annular member 25 and a pair of cooperating arcuately-shaped, spaced-apart track members 26 and 27 which are vertically disposed and spaced apart from the annular member 25 a distance slightly less than the diameter of a bowling ball A.

The annular member 25 is driven by a belt 30 disposed about the outer periphery of the annular member and passing over a driving pulley 31. Guide rollers 32, 33, 34, and 35 mounted in the supporting framework function to guide the annular member 25 for rotation and also to guide belt 30 on the periphery of the annular member. A Weighted roller 36 is mounted on pivotal arms, one of them being shown at 37 and functions to maintain the belt 30 taut.

A ball trap mechanism is provided to insure that a ball will be properly engaged by the track members 26 and 27 so as to ensure proper alignment of the ball with the annular member 25. This mechanism takes the form of pivotally mounting the lower end 38 of the track member 27 by means of a bracket 39 secured to a support block 40 for the lower track end 38 and a hinge member 41 connected to a central frame member 42. It will thus be seen that the lowermost position of the annular member 25 is adjacent the conveyor 3 which constitutes a ball pickup position. As a ball is moved onto the annular member 25, it will cause slight upward movement of the lower track end 38 to permit movement of the ball into engagement with the lower end 26a of the track member 26. As this occurs, the lower end 38 will lower slightly and the ball will be rolled up the track members 26 and 27 by clockwise rotation of the annular member 25 as shown in Fig. 1. A plurality of wires indicated generally at 45 secured to brackets 46, 47, 48 and 49 form a side guide to prevent accidental movement of a ball rearwardly of the track member 26. The upper ends of the track members 26 and 27 terminate in wires 50, 51 and 52 which form a discharge track for receiving a ball and guiding it to a conventional return track, not shown.

The track member 27 is disposed forwardly of the ball advancing member 25 while the track member 26 Patented Dec. 1, 1959 is disposed rearwardly of the ball advancing member 25 so that contact of the annular member 25 with the ball A is at a point between the points made by contacts of the ball with the track members 26 and 27, this being shown diagrammatically in Fig. 5. Positive elevation of the ball is assured because the weight of the ball aids in holding the ball in driving engagement with the annular member 25 when the ball first enters the elevator.

The pin elevating mechanism more clearly shown in. Fig. 2 is in the form of an annular member 60 disposed around the central frame member 42. Annular member 60 is rotated by a belt 61 (Fig. 3) disposed around a portion of the periphery of the annular member 60. The belt is driven by a driving pulley 62. The annular member 60 is guided by a plurality of guide rollers 63, 64, 6S and 66 mounted in the framework. The guide rollers 64, 65 and 66 also function to guide the belt 61. As shown in the lower left-hand corner of Fig. 2, the belt 61 leaves the periphery of the annular member 60 at that point and travels over an idler pulley 70.

As shown more clearly in Fig. 3, the annular member 60 is provided with a rim made up of rim parts 71 and 72. The rim 72 is of a slightly greater diameter than rim 71 so that a pair of outer flanges 73 and 74 on the guide roller 66 and also on guide rollers 63, 64 and 65 engage the edges of rim 72 and guide the annular members 60 while a pair of inner flanges 75 and 76 on these guide rollers ride on the rim 72 and engage the edges of the belt 61 to guide the belt.

The rim 71 is recessed at peripherally-spaced points as is the associated adjacent area of the body of the annular member 60 to receive pin engaging paddles or paddle members 77.

As shown in Figs. 2, 3 and 4, the paddle members 77, all of which are identical, are pivo-tally mounted on brackets 80 secured to the inner side of the rim portion 72. Inasmuch as each of the paddle members are identical, only one will be described in detail.

Each bracket 80 has ears 81 and 82 between which a. pin 83 extends upon which the paddle member 77 is pivotally mounted. A spring 84 connected between the bracket 80 and the paddle member 77 urges the paddle member to a position wherein it extends radially of the annular member 60 for a purpose hereinafter more fully set forth. The paddle member 77 is held in a position wherein it extends parallel to the axis of the annular member 60 and against the action of the spring 84 by an L-shaped latch member 85 which has an end 36 in engagement with a notch 87 in the inner end of the paddle member 77. The latch member 85 is pivotally mounted on a bracket 88 and is urged into latching position by a spring 89 connected between the latch member and the mounting bracket 80.

As pins are directed to the rear of the pit by the pit fioor belt 3, they engage the ball elevating member 25 which tends to disperse grouped pins and align the pins with their axes extending in the direction of pin travel. The pins pass beyond the ball-advancing annular member 25 and into a pin guiding channel formed by a plurality of wires 90, 91, 92 and 93 which are mounted on a plurality of brackets 94, 95, 96, 97, 98 and 99. The wires form the curved pin guiding channel having a lowermost position adjacent the pit floor slightly below the lowermost position of the ball elevating member 25. The channel extends upwardly from this position and terminates at a position approximately level with the axis of the annular member 60 where the pins are discharged one by one into a pair of vertically-disposed belts 100 and 101 (Fig. 1) which pass around a pair of lower pulleys 102 and 103, respectively. The belt 101 extends vertically and passes around a driving roller 104 while the belt 100 passes around a pulley 105 and changes from a vertical to a horizontal direction, the left hand end of the belt 100 passing around a driving pulley 106. Thus, a pin entering in the pin guiding channel formed by the wires -93 will be moved along the channel by a pin engaging paddle 77 until the pin passes between the belts and 101. The pin will then be elevated by the belts and directed out onto the horizontal stretch of belt 100. it is necessary to prevent interference between a paddle member 77 and the belt 100 as the paddle member is carried up between the belts 100 and 103 so that a trip block 117 (Fig. 4) is mounted on the framework adjacent the lower end of the belts 100 and 101 for tripping the latch member "65 to permit the paddle member 77 to move to its radial position as shown in Fig. 3. The trip block 117 is carried by a stationary portion of the framework and is positioned so as to permit the paddle members 77 to effectively position succeeding pins between the belts 100 and 101, and to trip the latches 85 so that the paddle members move past the belts without conflict therewith. As the annular member 60 continues to rotate, the radially-extended paddle member 77 will contact the bent cocking wire and be reset in its normal pin engaging position, as shown in Fig. 3. A

Although the specific mechanism forms no part of this invention, the drive belts for the annular member 25 and 60 as well as the pin engaging belts may be driven by a motor 111 which through belts 112 drives a pulley 113 which has a sprocket 114 connected therewith. The sprocket drives the driving pulley 31 for the belt 30 which drives the ball elevating member 25. A sprocket 115 on the same shaft as the driving pulley 31 drives a sprocket 116 by means of a chain 118 for driving the drive pulley 104 for the pin engaging belt 101. The drive pulley 113 has a shaft 120 which may be interconnected by mechanism not shown to a shaft 121 upon which the driving pulley 106 for the belt 100 is mounted. The end of the shaft 121 has a chain and sprocket drive 122 leading to a sprocket 123 (Fig. 3) which drives the pulley 62 for the belt 61 which drives the annular pin advancing member 60.

This application is a division of my copending application Serial No. 471,012, filed November 24, 1954.

I claim:

1. A ball and pin elevating apparatus for use with an automatic pinsetter mounted on a bowling alley comprising, in combination, a vertically-disposed framework mounted across the rear of the alley pit and extending for the width thereof, a rotary pin elevating member mounted at the rear of said framework, means mounting said pin elevating member for rotation in one direction to elevate pins from a position adjacent the floor of the alley pit to an elevated discharge position, an arcuate pin-guiding channel disposed adjacent the lower half of the pin elevating member for supporting pins as they are advanced by the pin elevating member and having its lowermost portion adjacent the pit floor, pin engaging paddles peripherally spaced about the pin elevating member to engage and move pins successively along the pin guiding channel as the pin elevating member is rotated, power-driven belt means engaging the periphery of the pin elevating member for imparting rotation thereto, a ring-shaped ball elevating member mounted in said framework and disposed forwardly of the pin guiding channel and having its lowest portion positioned slightly above the lowermost portion of the pin guiding channel so that on rotation the ball elevating member tends to disperse grouped pins engaged thereby and align the pins with their axes extending in the direction of pin travel, a pair of vertically disposed ball guiding track members having lower, generally horizontal ends mounted within the periphery of the ball elevating member for receiving and guiding a ball to an elevated discharge position, said track members being spaced from the ball elevating member a distance slightly less than the diameter of a bowling ball, one of said track members being disposed forwardly of the ball elevating member and the other being disposed rearwardly thereof, the forward-.

1y disposed track-member havingiits lower horizontal end pivotally mounted for raising movement so that a ball engaging said track member may cause slight raising thereof to permit entry of the ball between the track members, means including a belt engaging the periphery of the ball elevating member for rotating said ball elevating member in a direction opposite to that of the pin elevating member, and guide rollers on the framework engaging the ball elevating member and belt to rotatably guide the belt and ball elevating member.

2. A ball and pin elevating apparatus for a bowling alley having a pit and movable pit floor comprising, in combination, a vertically-disposed framework mounted across the rear of thealley pit, a rotary pin elevating member mounted at the rear of said framework and extending for substantially the entire width of the pit, means mounting .aid pin elevating member for rotation in one direction to elevate pins from a position adjacent the floor of the alley pit to an elevated discharge positicn, an arcuate pin-guiding channeldisposed adjacent the lower half of the pin elevating member for receiving pins from the movable pit floor and supporting pins as they are successively advanced by the pin elevating member, means peripherally spaced about the pin elevating member and overlying the pin guiding channel whereby to engage and move a pin along the pin guiding channel as the pin elevating member is rotated, means for rotating and guiding the pin elevating member, an annular ball elevating member mounted in said framework and dispcsed forwardly of the pin guiding channel, said ball elevating member having its lowest portion positioned slightly above the lowermost portion of the pin guiding channel, a pair of vertically disposed ball guiding track members having generally horizontal lower ends mounted within the periphery of the ball elevating member for receiving and guiding a ball from its position adjacent the pit fioor tv an elevated discharge track, said track members being spaced from the ball elevating mem ber a distance slightly less than the diameter of a bowling ball, one of said track members being disposed forwardly of the ball elevating member and the other being disposed rearwardly thereof, the forwardly disposed track member having its lower horizontal end pivotally mounted for raising movement so that a ball engaging said track member may cause slight raising thereof to permit entry of the ball between the track members and onto the ball elevating member, means including a belt engaging the periphery of the ball elevating member for rotatingsaid ball elevating member in a direction opposite to that of the pin elevating member, and guide rollers on the framework engaging the ball elevating member andbelt to rotatably guide the belt and ball elevating member.

3. A ball and pin elevating apparatus for a bowling alley having a pit and movable pit floor comprising, in combination, a vertically-disposed framework mounted across the rear of the alley pit, a rotary pin elevating member mounted at the rear of said framework and ex tending for substantially the entire width of the pit, means mounting said pin elevating member for rotation to elevate pins from a position adjacent the floor of the alley pit to an elevated discharge position, an arcuate pin-guiding channel disposed adjacent the lower half of the pin elevating member for receiving pins from the movable pit floor and supporting pins as they are successively advanced by the pin elevating member, means peripherally spaced about the pin elevating member and overlying the pin guiding channel whereby to engage and move a pin along the pin guiding channel as the pin elevating member is rotated, means for rotating and guiding the pin elevating member, an annular ball elevating member mounted in said framework and disposed forwardly of the pin guiding hannel, said ball elevating member haviug its lowest portion positioned slightly above the lowermost portion of the pin guiding channel, means includinga pair of'vertically disposed 'ball guiding track members having generally horizontal lower ends mounted within the periphery of the ball elevating member for receiving and guiding a ball from its position adjacent the pit floorto an elevated discharge track including one track member disposed forwardly of the ball elevating member and another disposed rearwardly thereof, means including a'belt engaging the periphery of the ball elevating member for rotating said ball elevating member relative to the pin elevating member, and guide rollers on the framework engaging the ball elevating member and belt to rotatably guide the belt and ball elevating member.

4. A ball and pin elevating mechanism for use with an automatic pinsetter associated with a bowling alley having a pit provided with a movable pit floor, comprising, incombination, a curved pin guiding channel extending across the rear of the alley pit and having a lower portion approximately mid-way between the sides of the pit, means mounted for rotation in a circular path including pin engaging members for advancing pins along the pin guiding channel, ball elevating mechanism disposed forwardly of said pin guiding channel and comprising a vertically-disposed annular member mounted for rotation relative to the rotary pin advancing means and having its lowermost portion approximately mid-way between the sides of the pin and at a level adjacent the lower portion of the pin guiding channel so that pins move onto the annular ball elevating member in passage to the pin guiding channel, vertically-arcuate track means disposed Within the periphery of the annular member for guiding a bowling ball to an elevated discharge position as the ball is rotated by the annular member and having generally horizontal lower ends positioned above the lowermost portion of the annular member for initially guiding a ball as it enters upon the lowermost portion of the annular member from the movable pit floor.

5. For use with a bowling alley having means in the alley pit for directing pins rearwardly toward a pickup position, in combination, pin elevating means including a pin elevating member extending transversely of the alleypit and movable through a path having a lower portion adjacent the pickup position and an upper portion adjacent an elevated discharge position for elevating pins singly from the pickup position to the discharge position, a generally vertically disposed, ring-shaped element extending transversely of the pit and having a lower portion adjacent the pickup positionand disposed forwardly thereof so that pins are directed thereonto and thereacross in passage rearwardly to the pickup position, and means for supporting and rotating the ring-shaped element relative to the pin elevating member to disperse grouped pins engaged thereby and to align the pins with their axes extending generally in the direction of pin travel afforded by said pin elevating means.

6." For use with a bowling alley having means in the alley pit for directing pins rearwardly toward a pickup position, in combination, a curved pin guiding channel extending transversely of the alley pit and having a lower portion adjacent the pickup position and an upper portion adjacent a discharge position, means mounted for movement along a curved path adjacent the pin guiding channel for engaging and advancing pins singly along the pin guiding channel from the pickup position to the discharge position, a vertically disposed, ring-shaped element extending transversely of the pit and having a lower portion adjacent the pickup position and disposed forwardly thereof so that pins are directed thereonto and thereacross in passage rearwardly to the pickup position, means for supporting and rotating the ring-shaped element rela: tive to the pin advancing means to disperse grouped pins engaged thereby and to align the pins with their axes extending generally in the direction of pin travel afforded by said pin guiding channel and said pin advancing means.

7. For use with a bowling alley having means in the alley pit for directing balls and pins centrally and rearwardly to a ball pickup position, a ball and pin separating mechanism comprising, in combination, a vertically disposed ring-shaped ball elevating member extending transversely of the pit and having its lower extremity beneath the ball pickup position so that pins and balls are directed thereonto, means for supporting and rotating the ball elevating member, and means disposed within the periphery of the ball elevating member and spaced therefrom to prevent passage of the ball rearwardly and for guiding and holding a bowling ball against the inner surface of the ball elevating member to be rolled up the guide means by the elevating member from the ball pickup position to an elevated ball discharge position so that the ball is thereby separated from the pins, the spacing of said guide means from said ball elevating member being sufficient to permit passage of the pins rearwardly onto and across the ball elevating member, and the inner surface of said ring functioning to disperse grouped pins engaged thereby, and pin handling mechanism positioned rearwardly of the ball elevating mechanism for receiving pins at a pin pickup position immediately to the rear of the ball pickup position.

8. In a ball and pin separating and elevating apparatus for a bowling alley having means in the alley pit for directing balls and pins rearwardly to a ball pickup position and a pin pickup position, in combination, pin elevating means for elevating pins singly from the pin pickup position to an elevated pin discharge position, a ball elevating member disposed forwardly of the pin elevating means and having an exposed continuous surface movable through a concave curved path extending transversely of the alley pit and having a lower portion beneath the ball pickup position adjacent the lower portion of the pin elevating means so that balls and pins are directed thereonto and an upper portion adjacent an elevated ball discharge position, and means convexly curved and spaced from said ball elevating member for guiding and holding a bowling ball against the concave surface of the ball elevating member to be rolled up the guide means by the elevating member from the ball pickup position to the ball discharge position, the spacing of said ball guide means from said ball elevating member permitting passage of pins rearwardly onto and across said concave surface to the pin elevating means, and said ball elevating member serving to disperse grouped pins engaged thereby.

9. In a ball and pin separating and elevating apparatus for a bowling alley having means in the alley pit for moving balls and pins rearwardly toward a ball pickup position and a pin pickup position, in combination, a curved pin guiding channel extending transversely of the alley pit and having a lower portion adjacent the pin pickup position and an upper portion adjacent a pin discharge position, means mounted for movement along a curved path adjacent the pin guiding channel for engaging and advancing pins singly along the pin guiding channel from the pin pickup position to the pin discharge position, a ball elevating member disposed forwardly of the pin guiding channel and having an exposed radially inner surface movable continuously through an arcuate path extending transversely of the alley pit and having a lower portion at the ball pickup position adjacent the lower portion of the pin guiding channel so that balls and pins are moved thereonto and an upper portion adjacent a ball discharge position, and ball track means spaced from said ball elevating member for guiding and holding a bowling ball against the radially inner surface of the ball elevating member to be rolled up the track means by the elevating member from the ball pickup position to the bail discharge position, the spacing of said ball track means from said ball elevating member permitting passage of pins rearwardly to the pin guiding channel, and said bail elevating member serving to disperse grouped pins engaged thereby and to align the pins with their axes extending generally in the direction of pin travel.

10. In a ball and pin separating apparatus for a bowling alley having an alley pit, in combination, a rotatable, vertically disposed, annular ball elevating member mounted in the-alley pit and having a lower portion adjacent a ball pickup position, ball guide means positioned adjacent'the ball elevating member for guiding and holding a ball to be rolled up the guide means by the ball elevating member from the ball pickup position to an elevated discharge position, means in the alley pit for directing balls into the ball pickup position between the ball elevating member and the ball guide means and for directing pins onto and across the inner periphery of the ball elevating member, and pin conveying means disposed after the ball elevating member in the path ofthe pins for delivering pins from a pin pickup position to a pin discharge position.

11. In a ball and pin separating and elevating apparatus for a bowling alley having means in the alley pit for directing balls and pins rearwardly toward a ball pickup position and a pin pickup position, in combination, pin elevating means including a rotatable, generally vertically disposed, pin elevating member extending trans versely of the alley pit for elevating pins singly from the pin pickup position to an elevatedrpin discharge position, a rotatable, generally vertically disposed, ring-shaped ball elevating member extending transversely of the pit and having a lower portion at the ball pickup position and disposed forwardly of the pin pickup position so that balls and pins are directed onto the ball elevating member, ball guide means disposed within the periphery of the bail elevating member for guiding and holding a ball to be rolled up the guide means by the ball elevating member from the ball pickup position to an elevated ball discharge position, the arrangement of said guide means relative to the ball elevating member permitting entry of a ball therebetween for elevation, preventing passage of the ball rearwardly of the ball elevating member, and permitting passage of the pins rearwardly to the pin elevating means, said ball elevating member being effective to disperse grouped pins engaged thereby.

12. In a ball and pin separating and elevating apparatus for a bowling alleyhaving means in the alley pit for directing balls and pins rearwardly toward a ball pickup position and a pin pickup position, in combination, a curved pin guiding channel extending transversely of the alley pit and having a lower portion adjacent the pin pickup position and an upper portion adjacent an elevated pin discharge position, a rotatable pin elevating member disposed rearwardly of the pin guiding channel and extending transversely of the alley pit for moving pins along the pin guiding channel, means for rotating the pin elevating member in one direction, an annular rotatable ball elevating member disposed forwardly of the pin guiding channel and extending transversely of the alley pit, said ball elevating member having a lower portion at the ball pickup position and adjacent the pin pickup position so that balls and pins are directed thereonto, means for rotating the ball elevating member in a direc-. tion opposite the rotation of the pin elevating member, ball guide means disposed within the periphery of the ball elevating member for trapping and guiding a ball to be rolled up the guide means by the ball elevatingmemher to an elevated discharge position, said ball guide means being spaced from the ball elevating member to permit passage of pins rearwardly to the pin guiding channel. 1

13. For use with a bowling alley having means in the alley pit for directing pins rearwardly toward a pickup position, in combination, pin conveying means movable transversely in the alley pit for conveying pins from the pickup position to a discharge position, a transversely disposed pin dispersing element in the alley pit having a portion including an upwardly facing surface positioned forwardlyof the pickup position and disposed in References Cited in the file of this patent UNITED STATES PATENTS Hedenskoog July 11, 1916 Hedenskoog Sept. 24, 1935 Davis Feb. 9, 1943 Rundell Nov. 13, 1951

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