TECHNICAL FIELD
This invention relates to loosefill insulation for insulating buildings. More particularly this invention relates to distributing loosefill insulation packaged in a bag.
BACKGROUND OF THE INVENTION
In the insulation of buildings, a frequently used insulation product is loosefill insulation. In contrast to the unitary or monolithic structure in insulation batts or blankets, loosefill insulation is a multiplicity of discrete, individual tufts, cubes, flakes or nodules. Loosefill insulation is usually applied to buildings by blowing the insulation into an insulation cavity, such as a wall cavity or an attic of a building. Typically loosefill insulation is made of glass fibers although other mineral fibers, organic fibers, and cellulose fibers can be used.
Loosefill insulation, commonly referred to as blowing wool, is typically compressed and packaged in bags for transport from an insulation manufacturing site to a building that is to be insulated. Typically the bags are made of polypropylene or other suitable material. During the packaging of the blowing wool, it is placed under compression for storage and transportation efficiencies. Typically, the blowing wool is packaged with a compression ratio of at least about 5:1. The distribution of blowing wool into an insulation cavity typically uses a blowing wool distribution machine that feeds the blowing wool pneumatically through a distribution hose. Blowing wool distribution machines typically have a large chute or hopper for containing and feeding the blowing wool after the bag is opened and the blowing wool is allowed to expand.
It would be advantageous if blowing wool machines could be improved to make them easier to use and transport.
SUMMARY OF THE INVENTION
The above objects as well as other objects not specifically enumerated are achieved by a machine for distributing blowing wool from a bag of compressed blowing wool. The machine includes a chute configured to receive the bag, a shredder mounted at an outlet end of the chute and configured to shred the bag and to pick apart the blowing wool, a mechanism for moving the bag toward the shredder, and a blower for distributing the blowing wool and shredded bag into an airstream.
According to this invention there is also provided a machine for distributing blowing wool from a bag of compressed blowing wool. The machine includes a chute configured to receive the bag. Also included is a rotatable shredder mounted at an outlet end of the chute and configured to shred the bag and to pick apart the blowing wool. The shredder is configured to repeatably change its direction of rotation. A blower for distributing the blowing wool and shredded bag into an airstream is also provided.
According to this invention there is also provided a method of distributing blowing wool from a bag of compressed blowing wool. The method includes providing a bag of compressed blowing wool, feeding the bag of compressed blowing wool into a chute configured to receive the bag, gripping the bag and moving it toward a shredder, shredding the bag with the shredder and picking apart the compressed blowing wool at an outlet end of the chute. The blowing wool and shredded bag are then distributed into an airstream.
Various objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view in elevation of an insulation blowing wool machine.
FIG. 2 is a front view in elevation of the insulation blowing wool machine of FIG. 1.
FIG. 3 is a partially cutaway elevational view of the machine of FIG. 1.
FIG. 4 is an elevational view of the shredder of the blowing wool machine of FIG. 1.
FIG. 5 is a side view of the spacer of FIG. 4.
FIG. 6 is a side view of the spacer of FIG. 5, taken along line 6-6.
FIG. 7 is a side view of the spacer of FIG. 5, taken along line 7-7.
FIG. 8 is an elevational view of the ripper of the blowing wool machine of FIG. 3.
FIG. 9 is an elevational view of the ripper roller of FIG. 8.
FIG. 10 is a side view of the ripper of FIG. 8.
FIG. 11 is a perspective view of a bag of blowing wool having a tear-away end.
FIG. 12 is a perspective view of a different bag of blowing wool, packaged in a sleeve.
FIG. 13 is a front view, partially cut away, of a feeder mechanism of an insulation blowing wool machine according to another embodiment of the invention.
FIG. 14 is an end view of the feeder mechanism shown in FIG. 13.
FIG. 15 is an exploded front view of the feeder mechanism with various potions cut away.
FIG. 16 is an enlarged view of the guide assembly shown in FIG. 15.
FIGS. 17-20 are elevational front views of portions of the feeder mechanism showing different positions of the shuttle.
FIG. 21 is a front view of the insulation blowing wool machine including the feeder mechanism.
FIG. 22 is a partially cutaway elevational view of the another embodiment of the insulation blowing wool machine, showing a tractor mechanism for moving the bag of blowing wool relative to the chute.
FIG. 23 is an elevational view of a shredder useful for use with yet another embodiment of the blowing wool machine.
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1-3, the blowing wool machine is indicated at 10. The machine 10 includes a chute 12 configured to receive a bag of insulation material, and a shredder 14 for shredding the bag of insulation and picking apart the blowing wool. A rotary valve 16 is also included in the blowing wool machine 10 for distributing the blowing wool. As shown in FIG. 3, a bag of compressed blowing wool 18 is placed in the chute 12 to introduce the blowing wool to the shredder 14. In general, the shredder 14 shreds the bag 18 of blowing wool and the blowing wool is distributed by means of the rotary valve 16. Also included in the blowing wool machine 10 is a ripper 20 for ripping apart a portion of the material of the bag 18 as the shredder 14 engages the bag 18 at the outlet end of the chute 12. Optionally, the machine is mounted on a frame 24, which includes a handle 26 and wheels 28. This makes the machine relatively easy to move from one location to another. Also, optionally the chute can be mounted for a rotation to a retracted position as shown at 12a for ease of storage and transportation. The shredder 14, ripper 20, and rotary valve 16 are all mounted for rotation. They can be rotatably driven by suitable means, such as by motor 30 and belts and pulleys 32. Alternatively, each of the shredder 14, ripper 20, and rotary valve 16 can be provided with its own motor.
The shredder 14 shreds the bag 18 and picks apart the blowing wool, and the shredded bag pieces and the blowing wool drops from the shredder 14 into the rotary valve 16. As shown in FIG. 3 the rotary valve includes a central hub 36 and a plurality of vanes 38 arranged radially. The vanes form compartments 40 which collect the bag pieces and blowing wool. When the rotary valve 16 rotates to the lowest position the compartment 40, the bag pieces and blowing wool will be entrained by the flowing stream of air from the blower 42, which is shown in FIG. 2. The blower 42 draws air from the inlet 44 and through the lowermost compartment 40 of the rotary valve 16, and then through the outlet 46 to distribute the blowing wool and shredded bag pieces. Attached to the outlet 46 is a distribution hose, not shown, for directing the airstream of blowing wool and shredded bag parts toward the insulation cavity.
The blowing wool in bag 18 can be any loosefill insulation, such as a multiplicity of discrete, individual tuffs, cubes, flakes, or nodules. The blowing wool can be made of glass fibers or other mineral fibers, and can also be organic fibers or cellulose fibers. The blowing wool in the bag 18 is compressed to a compression ratio of at least 5:1, which means that the unconstrained blowing wool after the bag is removed has a volume of 5 times that of the blowing wool in the bag. Typically, the compression ratio is about 20:1 or higher. The bag itself is typically made of a polymeric material, such as polyethylene, although any type of material suitable for maintaining the blowing wool in the desired compression can be used. Preferably, the bag will provide a waterproof barrier against water, dirt and other deleterious effects. By using a polymeric material for the bag, the blowing wool will be protected from the elements during transportation and storage of the bag. The preferred bag material is sufficiently robust to handle the physical abuse to which these bags are frequently subjected.
Typical bags of compressed blowing wool have rounded generally rectangular cross-sectional shapes. For example, the bag might have a height of about 8 inches, a width of about 19 inches and a length of about 38 inches. Such a bag might have a weight of about 35 pounds. Optimally, the chute 12 has a cross sectional shape which approximates the cross section of the bag 18. For example, for the bag specified above, the chute 12 might have a cross-section of about 9 inches by 20 inches. This allows the bag to be easily received and fed through the chute 12 in the machine direction 48 to be engaged by the shredder 14. By providing the chute with a cross section that approximates the cross section of the bag 18, the bag 18 will be contained and prevented from expanding prior to the point at which the bag is engaged by the shredder 14. The bag 18 can be moved through the chute 14 by the force of gravity if the chute is in a raised or upright position, as shown in FIG. 1. Alternatively, a ram or pusher, not shown, can be used to move the bag 18 along the chute 12. Where a ram is used, the chute 14 does not have to be in a vertical position, as shown in FIG. 1, but rather can be in any suitable orientation.
As shown in FIGS. 4-7, the shredder 14 includes a plurality spaced apart blades 50, mounted for rotation on a shredder shaft 52, which is aligned along the shredder axis 54. The spaced apart blades 50 are generally parallel to the machine direction 48. Typically the shredder blades 50 are mounted on centers of 1.25 inches although other spacings can be used. The blades 50 are spaced apart by spacers 56. The spacers 56 are generally disc shaped as shown in FIG. 5. Preferably the blades 50 and the spacers 56 are keyed to fix them to the shredder shaft 52. When viewing FIG. 4, it can be seen that the blades 50 extend outwardly from the shredder 14. When the bag of compressed blowing wool 18 engages the shredder 14, the rotating blades 50 define cuts or slits in the blowing wool.
Mounted on the spacer 56 is a mechanism which picks apart the blowing wool between the cuts made by the blades 50. The mechanism can be any suitable member for picking apart or loosening the highly compressed blowing wool between the cuts formed by the blades 50. In a preferred embodiment of the invention the mechanism is a plow shaped member, or plow 58 having a central ridge and outwardly extending flanges. Preferably the plow 58 is mounted on the spacer 56 in a cantilevered manner, although other mounting configurations can be used. The leading edge of the plow 58, being pointed, enables the plow 58 to dig into the blowing wool between the cuts made by the spacer 56. It can be seen from FIG. 4 that each spacer 56 is provided with one plow 58, and that the plows are staggered circumferentially about the shredder shaft 52 so that only one of the plows 58 engages the blowing wool at a time. Although the spacer 56 is shown with one plow 58, the spacer 56 can function with more than one plow 58. Also the plows of adjacent spacers need not be staggered circumferentially. With the plow 58 rotating clockwise, as shown in FIG. 3, the leading edge of the plow is oriented tangentially to the outer perimeter of the shredder, in the direction of rotation.
Also positioned on each of the spacers 56 is a mechanism, such as scoop 60, for removing the blowing wool insulation material ripped apart or loosened by the plow 58. The scoop 60 is generally diametrically opposed from the plow 58 on the spacer 56, as shown in FIG. 5. The scoop 60 can be any member, including a flange, a fork, or a web, suitable for removing the blowing wool insulation material ripped apart or loosened by the plow 58. Although not shown, more than one scoop 60 could be attached on each spacer 56.
As the bag 18 is being fed downwardly to engage the shredder 14, the shredder consumes the lower most surface 64 of bag and the blowing wool contained in the bag 18, as shown in FIG. 3. The lower most surface 64 is formed in a curved shape because of the action of the curved shredder 14. The plows 58 on the spacers 56 easily shred the bag 18 and pick apart the highly compressed blowing wool, particularly at the leading edge 66 of the bag and along most of the lower most surface 64. The leading edge 66 is the portion of the lowermost surface 64 that is first encountered by the rotating blades 50. However because of the orientation of the plow 58, the trailing edge 68 of the bag 18 is not readily shredded. In order to shred all parts of the bag 18, the ripper 20, distinct from the shredder 14, is provided to assure that the trailing edge portion 68 of the bag 18 is ripped apart. As shown in FIGS. 8-10, the ripper 20 is comprised of rotatably mounted roller 70 having a plurality of teeth 72 positioned along the length of the roller 70.
The ripper 20 also includes an anvil framework 74 intersecting the roller 70. The framework 74 has a cutting edge 76 which has a shape complimentary to the cutting teeth 72 on the roller 70 so that portions of the bag enmeshed between the cutting teeth 72 of the roller 70 and the cutting edge 76 of the framework 74 will be ripped apart. Preferably the cutting edge 76 includes substantially triangular gaps, and the teeth 72 are substantially triangular in shape for a close tolerance, in a manner similar to that of pinking shears. It is to be understood that other shapes for the teeth 72 and the cutting edge 76 can be used. Although the teeth 72 can be aligned along a line parallel to the roller axis 78, it is preferred that the teeth 72 be spaced apart circumferentially about the roller to avoid an uneven impact during the ripping operation. In such a case, each of the teeth 72 will have a different angular or radial orientation from all the other teeth. This is shown in FIG. 10. Preferably, the teeth 72 are arranged on the roller 70 so that the teeth 72 are mounted along a single spiral line along the length of the roller 72. The teeth 72 can be fastened to the roller 70 in any suitable manner, such as by bolting the teeth 72 on the roller 70 with brackets, not shown. In a preferred embodiment of the invention, the teeth 72 are made of steel, and each tooth has a length along the roller axis 78 of approximately 1.25 inches, and has a thickness of approximately 0.125 inches. As shown in FIGS. 8 and 10, the ripper 20 can include a second cutting edge 82. The purpose of the second cutting edge 82 is to assure that ripped apart bag portions are removed from the roller 70 and don't wrap around the roller. Other mechanisms could be used to clean the teeth 72.
Preferably, the roller 70 intersects the cutting edge 76 at a first location 84 and intersects the section cutting edge 82 at a second location 86, spaced apart circumferentially from the first location 84, as shown in FIG. 10. In a preferred embodiment of the invention, the cutting edge 76 and the second cutting edge 82 are mounted to the machine 10 by means of brackets 88. Any other means of attachment can be used.
In order to facilitate the shredding of the bag as it moves in the machine direction 48 in the chute 12, it is desirable to remove the end 92 of the bag 18a. For this purpose, in one embodiment of the invention, the bag, indicated in FIG. 11 at 18a, is provided with a tear-away mechanism 94. The tear-away mechanism can be a line of serrations or weakened bag material, or can be a ripcord, not shown. Other tear-away mechanisms can also be used. In practice, the operator of the blowing wool distributing wool machine 10 tears away the tear-away portion or end 92 of the bag 18a and places the bag into the chute 12. The tear-away end of the bag 92 can be provided at either end or both ends of the bag 18a.
As shown in FIG. 12, in another embodiment of the invention, the bag of blowing wool, indicated at 18b, can be in form of a sleeve 96 which contains or encapsulates the body of blowing wool material 98. Preferably both of the ends are open, thereby eliminating the need for end bag material to be shredded by the shredder 14 and the ripper 20. Since the blowing wool 98 in typical bags of blowing wool is compressed radially inwardly with respect to the longitudinal axis 100 of the bag 18b, the sleeve 96 is effective in restraining the compressed blowing wool 98 in its highly compressed state. As the bag 18b is fed through the blowing wool distributing machine 10, the shredder 14 does not have to shred any bag material from the end of the bag 18b.
One advantageous feature of the blowing wool machine of the invention is that the chute 12 need not be any larger in cross-section than the approximate cross-section of the bag 18 of blowing wool. This eliminates the need for a large hopper necessary on conventional blowing wool machines to contain the large volume blowing wool that inevitably results when the blowing wool machine operator opens the bag 18 and releases the blowing wool from its compressed state. With the chute 12 being much smaller than the hoppers of typical blowing wool machines, the entire blowing wool machine 10 is much smaller and lighter in weight than conventional machines. Additionally, with the chute 12 being mounted for a rotation to a retracted position as shown at 12a, the machine can be made even smaller, i.e., shorter in height, and it can be more readily transported and stored. These features allow the machine 10 of the invention to be easily transported in many readily available vehicles, such as family vans and sport utility vehicles, whereas conventional blowing wool machines cannot be transported in such vehicles. The easy availability of transport makes the blowing wool machine 10 of the invention amenable to rental by insulation material outlets, such as the big box home improvement stores.
Another advantage of the invention is that by shredding the bag and distributing the pieces of the bag with the blowing wool into the insulation cavity, the need to dispose of the emptied bags in a landfill or recycling operation, as well as the associated labor for handling the waste material, is eliminated.
Although the ripper 20 is advantageously employed as part of the blowing wool machine 10, it is not a requirement that the machine 10 include the ripper. In a broad sense, the machine for distributing blowing wool from a bag 18 of compressed blowing wool must include a mechanism for disposal of a portion of the bag. While this mechanism can be the ripper 20 described in this specification, it can also be any other mechanism for shredding the trailing edge 68 of the bag or otherwise disposing of a portion of the bag. For example, the mechanism can be a feeder, such as a roller, not shown, for feeding an unshredded portion of the bag to a disposal station, such as a collection bin, not shown. Also, the mechanism for disposal of a portion of the bag can be a laser cutter, not shown, for ripping apart a portion of the bag.
In operation the blowing machine 10 incrementally consumes the bag 18 of blowing wool, typically at a rate of about 10 pounds per minute. This incremental consumption results in a lower, more consistent power demand than that experienced with conventional blowing wool machines, thereby enabling the machine 10 to operate on 110 volt power, which is widely available at building construction sites and existing buildings where the blowing wool is being applied in a retrofit application. Also, the steady, incremental consumption of the bag 18 of blowing wool provides an even flow of material into the rotary valve 16, thereby eliminating clumping of the blowing wool and the resultant plugging of the rotary valve 16 or the distribution hose. The steady flow of blowing wool also enables a reduction in the diameter of the distribution hose.
As shown in FIGS. 13 and 14, in a particular embodiment of the invention, the insulation blowing wool machine is provided with an optional feeder mechanism 114 for moving the bag of blowing wool relative to the chute 12, instead of relying on a gravity feed for downward movement of the bag. The feeder mechanism 14 includes a vertically oriented track 116 in which a vertical slide 118 is mounted for up and down sliding movement. As shown in FIG. 14, several cam wheels 120 are mounted for rotation on an axle 122. The axle can be driven by any suitable means, such as a motor, not shown. Extending down from the cam wheels 120 are cam arms 126. The cam arms 126 are pivotally connected to the cam wheels 120 at a pivot point near the circumference of the cam wheels so that when the cam wheels rotate, the cam arms will be forced up and down. The lower ends of the cam arms 126 are pivotally connected to a bearing block 128 that is attached to the slide 118. Accordingly, when the cam wheels are rotated, the cam arms 126 and the vertical slide 118 will be reciprocated up and down.
As shown in FIG. 15, the vertical slide 118 includes a framework consisting of upper and lower guide flanges 130, 132, respectively. Positioned within the slide 118, between the upper and lower guide flanges 130, 132, is a shuttle 136. The shuttle 136 is mounted to be reciprocated or otherwise moved sideways, as viewed in FIGS. 13 and 15. Mounted on the shuttle 136 is a plurality of pins, such as an array of pins 140 that can be used to engage the bag 12 of insulation material, thereby gripping the bag, and enabling the pins 140 to control the movement of the bag relative to the chute. Any suitable number of pins can be used, such as, for example an array that is 5 pins high and 24 pins wide. The pins need not be in an array, but can be in any configuration. Preferably, the pins are readily removable from the shuttle. As shown in FIG. 13, they are secured on threaded posts 138 by nuts 139. The shuttle can also be provided with one or more springs 141 to urge the shuttle toward the bag 18.
As also shown in FIGS. 15 and 16, the feeder mechanism 114 includes a guide assembly 142 that is stationary with respect to the feeder mechanism 114. The guide assembly 142 includes a framework 144 that supports a track 146 that is substantially in the shape of a parallelogram. The track 146 includes vertical legs 150, 152 and diagonal legs 154, 156. A cam roller 160 is mounted to travel around the track 146. The cam roller includes a cam pin 148. The shuttle 136 includes a receiving hole 161 adapted to receive the cam pin 148, thereby connecting the shuttle 136 with the track 146 of the guide assembly 142.
As the slide 118 is reciprocated up and down by the cam arms 126, the cam roller 160 travels clockwise around the track 146, as indicated by the arrows. As shown in FIG. 17, when the slide 118 is at the top of the stroke, the cam roller is poised to travel down vertical leg 150. Part way down the stroke of the cam arms 126 the cam roller 16 reaches the lower end of the vertical leg 150, as shown in FIG. 18. The cam roller 160 then continues along diagonal leg 156. At the lowest point in the stroke of the cam arms 126, as shown in FIG. 19, the cam roller is at the lower end of the vertical leg 152. A spring loaded latch mechanism 162 having a beveled face is positioned in leg 156. This latch mechanism allows the cam roller 160 to pass in the clockwise direction, but prevents reverse movement (counter-clockwise) of the cam roller 160 along leg 156. Therefore, when the cam arms 126 begin to pull the slide 118 vertically upward, the cam roller 160 must travel up leg 152, as shown in FIG. 20, rather than reversing its path along diagonal leg 156. Further upward movement of the cam arms 126 causes the cam roller to travel along leg 154. Another spring loaded latch mechanism 164 prevents the cam roller 160 from traveling back down leg 154 once it reaches the original starting position shown in FIG. 17.
Because travel of the cam roller 160 along legs 156 and 154 moves the cam roller away from and back toward the slide track 116, the shuttle itself is moved or reciprocated laterally, away from and toward the chute 12 and the bag 18 of insulation material. When the cam roller is traveling downward in track 150, the shuttle is to the right, as shown in FIGS. 17 and 18, and the pins 140 are engaging the bag 18. The grip of the pins on the bag forces the bag downward for engagement with the shredder 14. As the shuttle is being moved up, when the cam roller 160 is traveling up leg 152, the shuttle is positioned to the left, as shown in the figures, and the pins 140 are not engaged with the bag 18. The size of the track 160, including the length and orientation of the legs 150, 152, 154 and 156, dictates the amount of movement of the bag 18 during each cycle. In a specific embodiment of the invention, the insulation machine 10 is configured to achieve an overall downward speed of about 10 inches per minute for the bag 18 of insulation material, and at a feed rate within the range of from about 7 to about 10 pounds per minute. It is to be understood that the speed and feed rate can be higher or lower as desired.
As shown in FIG. 21, it is preferred to have a feeder mechanism 114 on each side of the chute 12 for gripping the bag 18. It is to be understood that a feeder mechanism 114 can be used on all four sides of the chute 12. One advantage in using the pins 140 is that the bag can be fed into the shredder 14 at a desired rate. The feeder mechanism 114 can be operated at a speed desirable for optimum feeding of the bag 18 into the shredder. Also, the pins 140 prevent the plastic bag material from being stripped off the loosefill insulation as the top or final end of the bag approaches the shredder 14. Another particular advantage of the use of the feeder mechanism is that the pins 140 impart an array of perforations in the plastic bag material, thereby making it easier for the shredder 14 to shred the bag. Also, the pins 140 prevent the bag 18 from becoming tilted or cocked as the loosefill insulation is removed from the bag.
In another embodiment of the invention, as shown in FIGS. 22 and 23, a blowing wool machine 210, similar in many respects to the blowing wool machine 10, can be provided with a shredder 214 that is configured to alternate its rotational direction. The change in rotational direction of the shredder 214 facilitates the shredding of the loosefill insulation material and the plastic bag material. Any means, such as a reversible motor, not shown, can be used for repeatedly reversing the direction of rotation of the shredder 214. The use of a dual direction rotating shredder 214 enables the elimination of the bag ripper 20 described with reference to FIG. 1, thereby making the blowing wool distribution machine 210 more simple to construct and maintain. When the dual direction shredder 214 is employed, the plows 258 on the spacers 256 are preferably oriented with leading edges being pointed in two directions, as shown in FIG. 23. This will enable the plows 258 to dig into the blowing wool between the cuts made by the blades 250, regardless of which direction the shredder 214 is being rotated. The spacers 256 can be generally circular in shape rather than in an offset shape shown in FIG. 5.
In the dual direction operation of the shredder 214, the shredder can be rotated at any suitable speed, such as for example, at a speed within the range of from about 80 to about 100 revolutions per minute (rpm). The direction can be reversed with any desirable frequency, such as, for example, once every 10 seconds. Periods of up to a minute or more can also be used. Preferably, the shredder is configured to change its direction of rotation periodically with a period within the range of from about 5 seconds to about 100 seconds, and most preferably within the range of from about 5 seconds to about 25 seconds.
It is to be understood that although the feeder mechanism 114 described above, using the reciprocating vertical slide 118 and shuttle 136, is preferred, other feeder mechanisms can be used to help feed the bag of loosefill insulation into the shredder. For example, in FIG. 22, the chute 212 is provided with cooperating pair of belts 225 configured to feed the bag toward the shredder 214. The belts 225 can be of any suitable construction to feed the bags downwardly toward the shredder 214, and can be driven by any suitable means, such a motors. The belts can be rubber belts, spiked chains or any other mechanism that can meter the bag at a prescribed rate without allowing slippage.
While two different mechanisms have been described above and shown to be useful for moving the bag 18 of loosefill insulation material into engagement with the shredder 14, 214, i.e., the feeder mechanism 114 and the belts 225, it is to be understood that numerous other mechanisms can be used for moving the bag 18 toward the shredder. Preferably, the mechanism for moving the bag is configured to grip the sides of the bag so that the bag is prevented from being stripped from the insulation material as the top or final end of the bag approaches the shredder.
The principle and mode of operation of this invention have been described in its preferred embodiments. However, it should be noted that this invention may be practiced otherwise than as specifically illustrated and described without departing from its scope.
Patent Application
20060024456
