Apparatus for Holding Packaging Bags
An apparatus for holding stacks of plastic packaging bags, including a wicket and a securing device for securing the packaging bags to the wicket. The wicket includes a pair of elongated leg members, and a cross-member connecting together the leg members. Each of the leg members has a series of locking portions for selectively locking the securing device to the leg members at pre-determined distances from the cross-member. The securing device includes a pair of securing buttons having a bore sized and shaped to be slidable onto the leg members over the locking portions. The locking portions are pairs of aligned locking tabs shaped to prevent the securing buttons from sliding back off the leg members. A cartridge comprising a plurality of wickets coupled together by break away tabs can be used to automate a bag-stacking operation. The wicket and securing buttons are made to be recycled along with the bags lips left after bags are torn off, reducing waste. The wicket and buttons also provide improved locking of bags, and one wicket is capable of holding varying quantities of bags. A cross-member and securing device having a plurality of apertures allows a pair of elongated leg members to be formed into wickets of various sizes to accommodate different packaging bags.
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The present invention relates to a packaging apparatus, and in particular to apparatus for holding stacks of plastic packaging bags.
BACKGROUND OF THE INVENTIONPackaging bags are used for packaging in a number of industries, including for example food-packaging industries such as the baking industry. A packaging bag is typically made of a thin sheet of a plastic, often polyethylene or polypropylene, which is folded upon itself to form two plies, and is then sealed along the side edges, leaving the remaining end open. Typically, one ply is left longer than the other to define a lip, and a pair of holes is formed in the lip to allow each bag to be secured to other bags. A tear line is also typically formed to allow the lip of the bag to be torn off.
It is desirable that stacks of packaging bags be held together in a flatwise contiguous manner such that an operator of a packaging machine can quickly and easily select one bag from the stack of bags for use in packaging items. One current device for holding stacks of bags together comprises a piece of metal wire, such as a steel wire, bent into a ‘U’ shaped wicket. The holes in the bags are aligned, and the wicket is inserted into the holes. A pair of rubber washers, also known as grommets or discs, having an inside diameter smaller than the diameter of the wire, are placed onto the legs of the wicket to hold the bags in place. The frictional force between the stretched rubber washer and the metal wire wicket keeps the washer in place.
During operation, bags are ripped from the metal wicket along the tear line, leaving the lip of each bag behind on the steel wicket. Once all the bags have been ripped off of the wicket, the entire assembly containing the metal wicket, the bag lips and rubber washers is usually discarded as it is time consuming to remove the washer from the wire for reuse or to recycle the bags lips. Thus, undesirable waste is generated.
The rubber washers or discs used with prior art wickets tend to provide a less than desired gripping force. The rubber washers may not be fitted to the wire properly, and may loosen or fall off the metal wire, resulting in bags that are not properly secured, and which may be lost or impede with a bag-stacking process. Also, it is often difficult to automate the process of using metal wickets to secure stacks of bags. Metal wickets are often individually packaged, and generally must be manually prepared for insertion into a stack of bags. Typically, a more-than-desired level of operator involvement is required.
There is accordingly a need in the art for packaging bag holding apparatus that reduces the amount of waste generated while reliably securing stacks of packaging bags together in a way that can be easily automated.
SUMMARY OF THE INVENTIONThe present invention is directed to an apparatus for holding plastic packaging bags, comprising a wicket and a securing device for securing the packaging bags to the wicket. The wicket comprises a pair of elongated leg members, and a cross-member connecting together the leg members. Each leg member comprises a shank extending along a longitudinal axis and having a free end shaped to pass through apertures in the plastic bags. The securing device preferably comprises a pair of securing buttons, each of the securing buttons comprising a button body having a bore extending therethrough, the bore being sized and shaped to allow the button body to be slid onto and along the shank towards the cross-member. The leg members comprise a series of longitudinally spaced locking portions for selectively locking the securing buttons to the leg members at selected distances from the cross-member to secure the stack of bags against the cross-member.
In a preferred embodiment, the shank of the leg members has a generally cross-shaped cross section, defined by pairs of ridge members oriented perpendicularly to each other. The locking portions preferably comprise pairs of aligned locking tabs extending outwardly from at least one of the pairs of ridge members. The locking tabs have a wedge shaped forward portion and a rearward portion having a generally vertical trailing edge to allow sliding in one direction, but to resist sliding in the opposite direction.
The body of each securing button preferably comprises a rigid front body section and a rear body section having a resilient tubular wall. The button body is sized and shaped such that the buttons can be slid onto a wicket leg by deforming or ‘ovalizing’ slightly the region of the bore extending through the rear body section as the button body passes over a locking tab. As the button is pushed over the pair of locking tabs, the forward portion distorts the wall of the narrow portion of the button, forcing it to acquire an ‘oval’ shape such that it can pass over the locking tabs. Once a securing button is mounted on a leg member, a shoulder surface on the button engages with the trailing edges of the locking tabs to prevent the button from being removed from the wicket leg. The button therefore can only travel along the wicket in one direction. The large end of the securing button is sized for engaging and pressing against the plastic bags to secure them to the wicket. Thus, the buttons and locking tabs securely hold the bags in place, and will not loosen or fall off during use.
The wicket and securing buttons are preferably made of a rigid plastic, selected from a material, such as a polyethylene or a polypropylene, which is the same or is compatible with the material the bags are made from such that the wicket and the bags can be recycled together. During operation, individual bags are ripped from the wickets along a tear line to be used for packaging items, leaving behind a bag lip on the wicket. Once all the bags have been ripped from a particular wicket, the entire assembly including wickets, bag lips and securing buttons can be recycled together. Therefore, the amount of undesirable waste is reduced.
The present invention is also directed to a cartridge of wickets comprising a plurality of wickets, in which each wicket in the cartridge is connected to one or more other wickets such that a cartridge can be easily handled as one discrete unit, but which also allows an individual wicket to be easily removed from the cartridge. This may be accomplished by using break-away plastic tabs connecting adjacent wickets together. In some embodiments, the cartridge is formed as a continuous unit using an injection molding process to create the wickets and break-away tabs during one step. The cartridge of wickets is designed to be compatible with an automated or semi-automated bag stacking machine, thus providing for an improved bag-stacking process which reduces undesirable manual labor.
The present invention is also directed to an apparatus for holding a stack of packaging bags comprising a wicket having a pair of elongated leg members joined together in a spaced, parallel relationship by a cross-member, and a securing device for securing packaging bags to the wicket. Each of the leg members comprises a shank having a first end having an end cap extending therefrom, and a second end shaped to pass freely through apertures in the packaging bags.
The cross-member comprises a locking plate with at least one pair of spaced apertures for sliding along the shanks of the leg members, each aperture being shaped to engage with locking portions on the leg members to form the wicket. The securing device, also comprising a locking plate and at least one pair of spaced apertures, is used to secure packaging bags to the wicket. Preferably, cross-member and securing device have matching apertures. In a preferred embodiment, the cross-member engages with an end cap locking portion to securely hold the cross-member against the end caps of a pair of leg members.
The multiple pairs of spaced apertures in the cross-member and securing device allow wickets of different sizes to be formed using the same elongated leg members, cross-member and securing device to accommodate different sizes of packaging bags.
The invention will now be described, by way of example only, with reference to the following drawings, in which:
Referring to
Securing device 13 comprises a pair of securing buttons 18. Each of securing buttons 18 comprises a button body 19 having a bore 40 extending therethrough sized and shaped to enable button body 19 to be slid along shank 15 and to engage with locking portions 16 so as to secure the stack of bags against cross-member 14.
Shank 15 of leg member 12a extends along longitudinal axis z and shank 15 of leg member 12b extends along longitudinal axis z′ that is parallel to axis z and spaced to accommodate the openings of the bags being secured. Each shank 15 preferably has a generally cross-shaped cross-section, as a cross-shaped cross section provides a rigid and strong yet light-weight construction. Free end 20 of shank 15 has a tapered profile to allow leg members 12a, 12b to slide easily into apertures in the plastic bags. Locking portions 16 spaced along leg members 12a, 12b enable apparatus 10 to secure stacks of bags containing various quantities of bags using the same size wicket 11. The length of shank 15 and the spacing between locking portions 16 are selected to accommodate different quantities of packaging bags as well as bags of various thicknesses, according to standards in the industry, and can be adjusted to meet particular applications.
Wicket 11 and securing buttons 18 are generally made of a rigid material such as a plastic, for example polyethylene or polyethylene, preferably high-density polyethylene. Alternatively, wickets 11 and securing buttons 18 can be made from polyurethane, nylon, other plastics or other suitable material. In the preferred embodiment, wicket 11 and securing buttons 18 are made from the same material as the plastic bags being secured, or a material that is compatible with the bag material so they can be recycled together.
Cross-member 14 preferably comprises a flat slat 23 extending perpendicularly to and rigidly connecting leg members 12a, 12b together. Cross-member 14 and leg members 12a, 12b are preferably formed as one piece using an injection molding process.
Turning now to
Each of locking portions 16 comprises a pair of aligned locking tabs 17 extending outwardly from side edges 31 of first ridge members 22. Each of locking tabs 17 comprises a wedge shaped forward portion 26 and a rearward portion 27. Forward portion 26 comprises an outwardly inclined plane shaped to allow securing buttons 18 to be slid onto and along shank 15 towards cross-member 14. Rearward portion 27 has a flat top surface 28 parallel to side edge 31, and a trailing edge 29 extending perpendicularly to side edge 31. Trailing edge 29 is shaped to engage with securing buttons 18 and thereby prevent securing buttons 18 from sliding back along shank 15 towards free end 20.
Referring now to
Turning now to
Front bore region 42 has a diameter that is larger than H, the largest cross sectional dimension of shank 15, such that front button section 30 can pass freely along shank 15 without being impeded by pairs of locking tabs 17. In the preferred embodiment, front bore region 42 has a diameter around 7 or 8 millimeters.
Rear bore region 44 has a diameter that is large enough to allow rear button section 34 to be slid over pairs of locking tabs 17 on leg member 12 by deforming or ‘ovalizing’, but small enough to permit shoulder surface 36 to butt up against trailing edge 29 of locking tabs 17. Variation in the size of rear bore region 44 is possible by adjusting the wall thickness t of rear button section 34, as a thinner wall thickness t will make it easier to deform rear button section 34. Rear bore region 44 has a diameter typically around h. In the preferred embodiment, rear bore region 44 has a diameter of around 5 millimeters, and wall thickness t of rear portion 34 is about 1.5 millimeters.
Wide flat front surface 32 of front button section 30 is sized sufficiently large relative to the apertures in the plastic bags to engage the plastic bags and prevent them from sliding off of wicket 11 when securing buttons 18 are attached to leg members 12a, 12b. Thus, front surface 32 is at least slightly larger than the apertures in the plastic bags into which leg members 12a, 12b of wicket 11 are inserted. In the preferred embodiment, large flat surface 32 has a diameter of about one inch or 25.4 millimeters.
As shown in
Turning now to
By joining adjacent wickets 11 together, cartridge 60 has sufficient strength to be handled as a unit, allowing cartridge 60 to be easily inserted into an automated or semi-automated bag-stacking machine, while still allowing individual wickets 11 to be easily removed for use. In a preferred embodiment, wicket cartridge 60 can be formed as one piece using an injection molding process. It will be appreciated by those skilled in the art that while ten wickets 11 are shown in cartridge 60, the number of wickets 11 in a particular cartridge can vary according to the particular needs of an application.
Referring now to
Referring to
Referring now to
As best shown in
In a preferred embodiment, the shank 86 also comprises ridge member 108 protruding perpendicularly relative to the locking portions 104 so as to define a generally cross-shaped profile as best shown in
The leg members 82 further preferably comprise an end cap locking portion 106 adjacent the first end 87, sized and shaped to hold the outer surface 98 of the cross-member 92 securely against inner surface 91 of the end cap 90, such that the cross-member 92 can securely engage the elongated leg members 92 in a spaced, parallel relationship to form the wicket 81.
The cross-member 92 and securing device 94 each comprise a locking plate 95, each having a flat inner surface 96 and a flat outer surface 98, and at least one pair of spaced locking apertures 100. In a preferred embodiment, as best shown in
Locking apertures 100 are sized and shaped to freely pass onto the second ends 88 of the elongated leg members 82 such that the cross-member 92 and securing device 94 will slide easily along the shank 86 towards the first end 87 and end caps 90 of the leg members 82, but will resist sliding along the shanks 86 away from the first end 87 and end caps 90.
As best shown in
The apertures 100 on the cross-member 92 are spaced at pre-determined distances apart so that elongated leg members 82 can be mounted using different apertures 100 to define different sized wickets 81 for use with different sized packaging bags 48. For example, in a preferred embodiment, a pair of elongated leg members could be inserted into apertures 100a and 100h on cross-member 92, spaced approximately five inches apart, to create a wicket 81 for use with packaging bags 48 having holes 58 spaced five inches apart. The same cross-member 92 and leg members 82 could be used to define different sized wicket 81 by mounting the leg members 82 in apertures 100d and 100e spaced two inches apart to accommodate packaging bags 48 having holes 58 spaced two inches apart. In this manner, the same elongated leg members 82, cross-members 92 and securing devices 94 can be used to secure multiple sizes of packaging bags 48.
As shown in
The cross-member 92 and securing device 94 have sufficient thickness such that they can resiliently hold the leg members 82 together to define a wicket 81 as well as secure a stack of plastic bags 48 to the wicket 81 when in use.
It should be apparent to those skilled in the art that the packaging bag holder apparatus of the present invention has a number of advantages over prior art apparatus. By using the same or compatible materials as the plastic bags to make the wicket and the securing buttons, the entire apparatus with bag lips attached thereto can be recycled together once all the bags have been removed. This eliminates the waste that would be generated with some of the prior art wicket apparatus. Further, the securing buttons and locking tabs of the present invention provide a reliable and effective locking means that resists loosening, and holds the stacks of plastic bags firmly in place. The locking tabs spaced at pre-determined distances along the leg members of the wicket allow the same size of wicket to be used to hold different quantities of bags of various thicknesses, according to generally understood standards in the industry. For example, stacks of one hundred bags or five hundred bags can be held on the same sized wicket. The present invention is also highly useful for automating the bag stacking process. Using a cartridge of wickets allows for easy manipulation of a large number of wickets, and lends itself towards a bag-stacking machine using an automated process for stacking bags. Finally, the use of cross-members and securing devices having multiple pairs of apertures defined at pre-selected distances apart allows the same elongated leg members, cross-member and securing device to be used to form wickets of different sizes for securing packaging bags of different sizes.
Accordingly, while the invention has been described with regard to preferred embodiments, it should be understood by persons skilled in the art that various modifications may be made thereto without departing from the present invention, the scope of which is defined in the claims appended hereto.
Claims
1. Apparatus for holding a stack of packaging bags, comprising:
- a) a wicket comprising a pair of elongated leg members and a cross-member connecting the leg members together in a spaced parallel relationship, each of the leg members comprising a shank having a free end shaped to pass through apertures in the packaging bags; and
- b) a securing device for securing the packaging bags to the wicket, the securing device having a pair of bores extending therethrough, each of the bores being sized to allow the securing device to be slid onto and along the shank of each of the leg members towards the cross-member;
- c) wherein each of the leg members comprises a series of longitudinally spaced locking portions for selectively locking the securing device to the shank at pre-selected distances from the cross-member so as to secure the stack of bags against the cross-member.
2. The apparatus of claim 1, wherein the securing device comprises a pair of securing buttons, each of the securing buttons comprising a button body having a bore extending therethrough, the bore being sized to allow the button body to be slid onto and along the shank.
3. The apparatus of claim 2, wherein each of the locking portions comprises a pair of aligned locking tabs extending outwardly from side edges of the shank, each of the locking tabs having a forward portion shaped to distort the bore of the button body to allow the button body to be pushed over the pair of locking tabs, and a rearward portion having a trailing edge shaped to engage the button body and prevent the button body from sliding back over the pair of locking tabs towards the free end of the shank.
4. The apparatus of claim 3, wherein the forward portion of each of the locking tabs comprises a wedge shaped portion extending outwardly from one of the side edges of the shank.
5. The apparatus of claim 4, wherein the trailing edge of the rearward portion of the locking tabs extends generally perpendicularly to one of the side edges of the shank.
6. The apparatus of claim 5, wherein the button body comprises a rigid front body section having a flat front surface for pressing against the packaging bags, and the bore comprises a front bore region extending through the front body section, the front bore region having a diameter sufficient to allow the button body to pass over the pairs of locking tabs of the leg member.
7. The apparatus of claim 6, wherein the button body also comprises a rear body section having a resilient tubular wall, and the bore comprises rear bore region extending through the rear body section, the rear bore region having a diameter less than the largest cross sectional dimension of the shank, wherein the tubular wall is sufficiently thin to enable the rear bore region to distort to allow the button body to pass over the pairs of locking tabs.
8. The apparatus of claim 1, wherein the shank of each of the leg members has a cross-shaped cross section.
9. The apparatus of claim 8, wherein the shank of each of the leg members comprises a pair of first ridge members and a pair of second ridge members, the pair of second ridge members being oriented perpendicularly to the pair of first ridge members.
10. The apparatus of claim 9, wherein the locking portions comprise pairs of aligned locking tabs spaced along and extending outwardly from at least one of the pairs of first ridge members or the second ridge members.
11. The apparatus of claim 1, wherein the wicket and the securing buttons are made from a material compatible, for the purposes of recycling, with the packaging bags.
12. The apparatus of claim 9, wherein the wicket and the securing buttons are made from a polyethylene plastic.
13. The apparatus of claim 1, wherein the securing device comprises a locking plate having a flat front surface and a rear surface, and a pair of spaced securing buttons extending outwardly from the rear surface of the locking plate, the securing buttons being spaced so as to register with the pair of leg members.
14. (canceled)
15. (canceled)
16. (canceled)
17. (canceled)
18. (canceled)
19. (canceled)
20. (canceled)
21. Apparatus for holding a stack of packaging bags, comprising:
- a) a wicket having a pair of elongated leg members, each of the leg members comprising a shank having a first end with an end cap extending therefrom, a second end shaped to pass freely through apertures in the packaging bags, and a cross member for connecting the leg members together in a spaced parallel relationship so as to form the wicket; and
- b) a securing device for securing the packaging bags to the wicket, the securing device having at least one pair of spaced locking apertures extending therethrough, the locking apertures shaped to enable the securing device to be slid onto and along the shank of each of the pair of leg members towards the first end;
- c) wherein each of the leg members comprises a series of longitudinally spaced locking portions for selectively locking the securing device to the shank at pre-selected distances from the end cap so as to secure the stack of packaging bags between the cross-member and the securing device.
22. The apparatus of claim 21, wherein the cross-member comprises at least one pair of spaced locking apertures extending therethrough, each of the locking apertures shaped to enable the cross-member to be slid onto and along the shank of each of the pair of leg members towards the first end.
23. The apparatus of claim 22, wherein locking portions on each leg members secure the cross-member against the end cap on each leg member to form the wicket.
24. The apparatus of claim 23, wherein the cross-member has at least two pairs of spaced locking apertures such the wicket can be formed in at least two different configurations for accommodating differently sized packaging bags.
25. The apparatus of claim 21, wherein the securing device and the cross member each comprise a locking plate.
26. The apparatus of claim 24, wherein each of the locking portions comprises a pair of aligned locking tabs extending outwardly from the side edges of the shank, each of the locking tabs having a forward portion shaped to distort the apertures in the locking plates to allow the locking plates to be slid over the locking tabs, and a rearward portion having a trailing edge shaped to engage the aperture of the locking plates and prevent the locking plates from sliding back over the pair of locking tabs towards the free end of the shank.
Type: Application
Filed: Sep 1, 2006
Publication Date: Aug 21, 2008
Applicant: KEW ASSEMBLIES LTD. (Lakeshore, ON)
Inventors: James W. Weldon (Tecumseh), Randy L. Brooks (Tilbury)
Application Number: 12/065,309