1. Field of the Invention
The present invention is broadly concerned with operator-controlled lift assist assemblies specifically designed to transfer segments of linked food products such as hot dogs from a conventional linker output device to the input rail assembly of a smokehouse. More particularly, the invention is concerned with such assemblies and methods which include a generally horizontally extending arm supported by a lift unit for selective raising and lowering of the arm, and wherein the arm has selectively extensible load-bearing elements for supporting food segments. The arm and lift unit are preferably mounted on an overhead rail allowing translatory shifting movement of the lift unit and arm between the linker and smokehouse input rail assembly. The invention eliminates arduous manual lifting and carrying of food segments.
2. Description of the Prior Art
In the production of linked food products such as hot dogs, conventional linker units receive an incoming meat emulsion, stuff the emulsion into elongated casings, and twist the filled casings at spaced locations in order to created an elongated string of the linked products. The linked product output is continuously draped onto a linker output device such as an endless, moving, vertical or horizontal track. In order to complete production of the linked products, they are generally passed through a smokehouse for cooking. Typical smokehouses have transfer rail systems leading from an input point and through the smokehouse for final cooking of the products.
Normally, the output from the linker cannot be directly placed on the smokehouse rail system. Accordingly, individual segments of the linked product (which may weigh 30 lbs. or more) must be transferred from the linker output to racks mounted on the smokehouse input rail. Heretofore, this transfer of linked food product segments has been a manual labor operation. Such transfers involve passing a hooked rod beneath a segment of the linked product draped over the linker output device, followed by lifting the entire segment by the rod ends. The entire rod/food segment assembly must then be carried to the smokehouse input rail and manually mounted on an empty rail hanger.
When it is considered that such transfers may be made two or three times per minute, it will be appreciated that the labor involved in transferring the product segments is considerable. Indeed, manufacturers have been obliged to hire individuals of large stature and considerable upper body strength in order to perform the transfer operation over an eight hour shift. This practical necessity eliminates most women and many smaller men from this work category.
While various lift assist devices mounted on overhead rails have been proposed in the past and commonly used in many industries, heretofore no specifically designed lift assist assembly has been provided for the transfer of linked food product segments between a linker output device and a smokehouse rail assembly.
The present invention overcomes the problems outlined above and provides apparatus for transferring individual segments of linked food product from a first location such as a linker output device to a spaced second location such as a smokehouse input rail assembly. The apparatus preferably comprises an elongated, generally horizontally extending arm assembly having a plurality of load-bearing elements projecting therefrom and operable to support a food product segment. The assembly also has a lift unit operably coupled with the arm assembly for selective raising and lowering thereof, and an elongated rail operably supporting the lift unit and arm assembly and permitting translatory movement of the lift unit and the food segment-loaded arm assembly along a selected path of travel generally between the first and second locations. The load-bearing elements of the arm assembly are operable to engage and support a food segment at the first location. The food segment-loaded arm assembly and lift unit are shiftable along the length of the rail towards the second location in order to permit delivery of the supported food segment to a support component at the second location, and to disengage the elements from the food segment.
In preferred forms, the support rail is pivotal about a first upright axis while the arm assembly is pivotal about a second upright axis separate from the first axis. This allows accurate movement and positioning of the arm assembly for pickup and delivery of the food segments. Also, the arm assembly preferably has a plurality of hooks for engaging and supporting the food segments, with the hooks being selectively extensible and retractable. Control apparatus is provided to extend the hooks and permit loading thereof with a food segment at the first location, and to retract the hooks after delivery of the food segment at the second location. This control apparatus is operable to exert a retraction force upon the hooks while the hooks are under a load supporting the food segment, and to thereby automatically retract the hooks after delivery of the food segment at the second location. Operating buttons for control of the entire transfer apparatus are preferably provided on the arm assembly.
A corresponding method of transferring individual segments of linked food product from a first to a second location also forms an aspect of the invention. The method comprises the steps of providing an elongated, generally horizontally extending arm assembly having a plurality of load-bearing elements projecting therefrom, and moving the arm assembly to a position adjacent the segment, and causing the elements to engage and support the load of the food segment. In the next step, the loaded segment is moved by translation of the arm assembly to a position adjacent the second location, followed by delivery of the food segment at the second location by transferring the food segment to a support component at the second location, and disengaging the elements from the food segment.
a is a fragmentary perspective view illustrating the operator handle end of the assembly depicted in
a is a perspective view depicting one of the rod-engaging hook devices of the transverse arm assembly, and illustrating the operation thereof in phantom and full lines, respectively;
b is a vertical sectional view of the hook device illustrated in
a is a side elevational view of a lift assist assembly during engagement of during use of the assembly to remove a segment of linked food product from the linker output track;
b is a side elevational view similar to that of
a is a fragmentary view in partial vertical section illustrating the configuration of a vertical lift unit in the fully retracted position thereof;
Turning now to the drawings,
In more detail, the assembly 20 broadly includes a ceiling mounting assembly 32, a vertical lift unit 34 supported by and depending from the rail 52, and a transverse arm assembly 36 supported by vertical lift unit 34. The linker 26 is entirely conventional and includes a linking device 38 operable to create interconnected, linked food products such as hot dogs and to place individual segments 24 thereof onto an endless, oval-shaped track 40 having a series of outwardly extending hooks or tines 41 (
The ceiling mounting assembly 32 is best illustrated in
The vertical lift unit 34 includes an upper carriage 64 moveable along the length of the roller tubes 62 and 63, a housing 66 depending from carriage 64, and an internal operating assembly 68 (
Internal operating assembly 68 (
The operating assembly 68 further includes a stationary control assembly 114 which is operably coupled with pneumatic control circuit 92 in order to control the operation of primary lift cylinder 88 and transverse arm assembly 36. The assembly 114 (
The pneumatic control circuit 92 is made up of a series of wholly conventional components coupled in a conventional way to achieve the desired and novel control sequences for the operating assembly 68 and transverse arm assembly 36. Accordingly, those skilled in the art will understand that a variety of different hardware components and hookups could be employed, given the desired control sequences. In preferred forms however, the circuit 92 includes upper and lower speed control fittings 138, 140 coupled with cylinder 88. A pair of pneumatic supply and exhaust fittings 141 and 142 are also provided; the supply fitting 141 is operatively coupled with compressed airline 58, and exhaust fitting 142 is coupled with exhaust line 56. The circuit 92 additionally has a pair of air-piloted, four-way, two-position valves 144, 146, logic component 148, and directional control valve 150. The valve 150 is equipped with a pair of timers 152, 154. The bushing block 118 also carries a pair of plunger-operated valves 156 and pneumatic fittings 158.
The transverse arm assembly 36 is best depicted in
The opposite or work side of arm assembly 36 includes three synthetic blocks 178, 180, and 182 secured to wall 160 via threaded fasteners 184 and cooperatively presenting a pair of upright lift hook assembly slots 183. As shown, intermediate block 180 has an elongated slot 181 with a solid horizontal handle piece 181a located between the wall slots 164, 166. A pair of double-acting, pneumatic pancake cylinders 186, 188 are located at the juncture between blocks 178 and 180, and blocks 180 and 182. The cylinders 186 and 188 are coupled with and control a pair of identical lift hook assemblies 190, 192; because these assemblies are identical, only assembly 192 will be described in detail.
Specifically, the air cylinder 188 includes an upwardly extending plunger 194 which is slidable within a vertical bore 196 formed in block 180. A transverse threaded bore 198 extends through the plunger 194 as best seen in
Returning to
The operator next depresses one of the lift buttons 174 while withdrawing the arm assembly 36. Depression of the button 174 shifts control valve 146, which pressurizes cylinder 88, causing rod 90 to retract. The combined upward and outward motion of the assembly 36 causes the rod 216 to engage the section 24 at the interconnection between highest and next links in the section 24b of segment 24. This is illustrated in
Further upward movement of the unit 34 continues until top wall 98 of cage 96 engages the underside of plate 116. This in turn actuates the valves 156, shifting valve 144 and valve 146 (the latter through logic element 148). This has the effect of extending the stop rods 134a and 136a, and also causing the rod 90 to begin to shift downwardly. The rod 90 descends until the plate 102 encounters the extended stop rods 134a, 136a. This positions the rod 216 supporting the segment 24 at the proper height for transfer to one of the hangers 44. The operator then manipulates arm assembly 36 to move the lift unit and arm 36, the latter carrying the rod 216 and segment 24, towards rail assembly 30. Generally, the operator moves these components along an exemplary path of travel 218 illustrated in
As the operator moves assembly 20 along path 218 an empty rack 44 is approached; this typically involves both pivoting the assembly about the axis of tube 50 and also by translatory movement of the unit 34 and assembly 36. This travel is illustrated in
Once the travel along path 218 is completed, the assembly 36 and supported segment 24 are adjacent the opposite end of rail 52 as shown in
Further downward movement of the assembly 36 causes the near end of the rod 216 to engage clip 45 so that the hanger 44 takes all of the load of the hook 216 and segment 24. At this point the retractive force previously exerted on the hooks 200 comes into play, causing them to fully retract within the slots 183. This permits the operator to easily withdraw the assembly 36 fully through section 24b and from the racks 44 without disturbing or damaging the food segments 24. The operator can then traverse path 218 back to the linker track 40 to reload the assembly 20. During the course of this return travel, the timer 154 times out, operating the cylinder 186, 188 so that the hooks 200 are again extended. This takes the operator back to the starting position to allow a repeat of the forgoing method steps.
In the embodiment of
The support assembly 220 includes a floor-mounted, gusseted base 222 which supports an upwardly extending, essentially vertical standard 224. A pivot arm 226 is secured to standard 224 adjacent the upper end thereof, with the arm 226 supporting a cantilever rail 228. A strut 230 extends between arm 226 and rail 228 to provide further support. The rail 228 has an elongated main body 232, as well as side flanges 234 and 236. The carriage 64 forming a part of lift unit 34 travels along the length of rail 228 in the manner previously described.
Use of the assembly 20a is essentially identical with that of the corresponding assembly 20, except that pivoting of the rail 228 occurs about the axis of side-mounted pivot arm 226, rather than the axis of tube 50. Moreover, the path of travel traversed by the unit 20 between the loading track 40 and the rail assembly 30 would have a configuration different than that of the exemplary path 218 of the first embodiment.