Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B67/00—Apparatus or devices facilitating manual packaging operations; Sack holders
  • B65B67/12—Sack holders, i.e. stands or frames with means for supporting sacks in the open condition to facilitate filling with articles or materials
  • B65B67/1244—Sack holders, i.e. stands or frames with means for supporting sacks in the open condition to facilitate filling with articles or materials characterised by mechanisms for temporarily closing the mouth of the sack, e.g. pedal-operated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B67/00—Apparatus or devices facilitating manual packaging operations; Sack holders
  • B65B67/12—Sack holders, i.e. stands or frames with means for supporting sacks in the open condition to facilitate filling with articles or materials
  • B65B2067/1283—Means for gathering, closing or sealing the sacks

Definitions

• the present invention relates .to a bag holding and sealing unit.
• Waste disposal bags whether of paper or plastics material, are commonly presented for use by being suspended at their open upper ends from the rim of a free-standing bin or from a wall-mounted frame.
• the upper end of the bag is held open and the bin or frame may have a lid to cover the open end when the bag is not in use.
• the bag When the bag is full, it can be closed at its upper end by a tie, adhesive tape or staples.
• Such a method of supporting and subsequently closing the bag is satisfactory provided the lid adequately covers the bag and provided the final closing of the bag results in secure sealing.
• These considerations are of particular significance in the case of waste disposal bags for restaurants, hospitals and similar establishments where hygiene and sanitation are of paramount importance. In such cases, suspension- of the .bag from a lidded bin or frame and manual sealing of the filled bag may not be ideal.
• One of the parts incorporates a heating sealing element for sealing the bag mouth.
• the moving part of the structure is represented by a front cover (which in the case of the unit of GB 1 037 576 extends the full depth of the bag) spring-loaded into the closing position. In its open position, the front cover must be held against " the closing force of the spring-loading and consequently the user has only one hand available for placing material into the bag. The absence of a rest setting of the front cover when the bag is open is inconvenient, especially for such actions as scraping waste materials into the bag.
• a further disadvantage of these units relates to operation of the heat sealing device.
• Safety considerations require the device to be operable only under certain conditions and these are fulfilled by a relatively cumbersome arrangement of a locking lever which is swung forward to lock the movable front cover against the wall-mounted part of the structure. In its forward position the lever exposes a manually operable switch for the heat sealing device.
• Two separate actions, i.e. movement of the lever and operation of the switch, are required by the user in order to actuate the heat sealing device and the lever adds to the constructional cost and complexity of the unit.
• lever arrangement does not clearly satisfy safety requirements. It appears possible to move the lever and expose the switch for operation when the front cover is in its open position and thus when the heat sealing element might be able to be touched.
• EP 0 005 660 is a device for forming sealed packaging bags from a continuous tube.
• the device functions as part of automatic packaging equipment and requires preliminary loading with the tube in a compressed state.
• the tube is drawn downwardly section by section, with each section being sealed at its lower end before filling and sealed at its upper end after filling.
• the device produces bags, rather than works with bags, and incorporates complicated drive arrangements for advancing and sealing sections of the tube. Utilisation of the device is consequently limited to industrial packaging equipment.
• the present invention has its principal object the provision of a bag holding and sealing unit which is relatively simple and convenient to use, in particular with respect to bag filling and sealing, and which is suitable for domestic, commercial or industrial use.
• a supplementary object of the invention is to provide a bag sealing and holding unit which may be economic to manufacture and which is sturdy and compact.
• a bag holding and sealing unit comprising a first bag holding member for mounting on a substantially vertical surface and provided with first retaining means for releasably retaining one of two mutually opposite side walls of a bag open at its upper end, a second bag holding member mounted on the first member to be pivotable relative thereto about a pivot axis and provided with second retaining means for releasably retaining the other one of said walls of the bag, the second member being movable between a first rest setting in which the upper end of the bag when retained by the first and second retaining means is kept closed by the members and a second rest setting in which the upper end of the bag is held open by the members, and additionally between the first rest setting and a transient setting which is spaced from the first rest setting in direction away from the second rest setting and in which the upper end of the bag remains closed, resilient means to press the bag walls against each other in the first rest setting of the bag and to return the second member from the transient setting to the first rest setting, heat sealing means
• Such a unit has open and closed rest settings for the movable second member, so that the user is not obliged to combat a spring- loading when the second member is in the setting in which the bag is held open.
• the pivot axis can be so disposed that the second member is locatable in each of the rest settings by gravity.
• Other methods can be used, however, for example an over-centre spring arrangement in which spring force draws the second member into either one of the rest settings but does not prevent it from freely remaining in the other rest setting.
• Even in the case of gravity location of the member in its open setting it may be advantageous to provide spring, cam or detent means to assist retention of the member in the closed setting and it is merely sufficient to ensure that the nature of any such assistance cannot alone overcome the gravity effect in the open setting.
• each of the members comprises a transverse head portion and two depending legs, with the pivot axis being disposed at the free ends of the legs.
• Lateral stability of the members relative to each other may be improved if the legs of one member are provided with guide blades and the legs of the other member with slots guiding the blades.
• the blades are for preference provided with abutments to determine the second rest setting of the second member.
• the heat sealing means is preferably arranged on the first member and the resilient means preferably has the form of a strip of elastomeric material arranged on the second member.
• the resilient strip serves to both close the bag upper end in the first rest setting of the second member and oppose movement of the second member into the transient setting.
• the second member can thus remain in the transient setting for as long as it is pressed towards the first member by the user.
• the requirement for the user to maintain a small pressure on the second member in order for the actuating means to respond and actuate the heat sealing means represents a simple and safe method of ensuring that the user must be present and personally initiate and supervise the sealing procedure.
• the resilient strip acts to move the second member out of the transient setting.
• the heat sealing means itself preferably comprises an electrically heatable wire covered by a heat-resistant tape.
• the wire can be held at its ends by spring means arranged to compensate for thermally-induced change in the length of the wire.
• the actuating means comprises a switch to control operation of the heat sealing means.
• the switch can be a microswitch disposed on the first member, and the second member can be provided with ' a projection to actuate the microswitch in the transient setting of the second member.
• the actuating means preferably also comprises timing means, such as a bimetallic switch, to terminate operation of the heat sealing means after a predetermined period of time. Consequently, the heat sealing means will switch off even if the user maintains the second member in the transient setting for longer than actually necessary for sealing of the bag.
• At least one of the first and second retaining means preferably comprises a plurality of spaced apart projections engageable in* perforations provided at the upper end of the bag. These projections may each comprise a shank part and a head part of greater height than the shank part. The projections are, for preference, hooks.
• the bag itself preferably consists of thermally weldable material, such as thermoplastic plastics material. Alternatively, the bag can be simply provided at the upper ends of the inner faces of its two side walls with strips of thermally fusible material, such as an adhesive.
• the bag material in that case can be paper.
• Fig. 1 is a perspective view of a bag holding and sealing unit embodying the invention, with the unit in the closed state;
• Fig. 2 is a view similar to Fig. 1, but with the unit in the open state;
• Fig. 3 is a partly sectional end view of the unit in the closed state and suspending an empty bag, which is also closed;
• Fig. 4 is an end view similar to Fig. 3, but with the unit in the open state and the bag also open;
• Fig. 5 is a schematic view of heat sealing means of the unit and a block circuit diagram of associated actuating means.
• a bag holding and sealing unit 10 which is particularly intended for waste disposal bags but which is equally suitable for packaging bags, that is to say bags for packaging foodstuffs, consumer goods and other articles.
• the unit comprises a first or fixed bag holding member 11, which is intended to be mounted on a wall or other such surface and which for this purpose has a planar rear face, and a second or movable bag holding member 12, which is pivotably connected to the first member.
• the two members are injection-moulded plastics material components and each consist of an at least partly hollow transverse head portion and two hollow depending legs.
• the pivotable interconnection is provided at the free ends of the legs.
• the legs of the fixed member 11 are provided with brackets 13 which extend into the hollow spaces of the legs of the movable member 12 and are connected to those legs by coaxial pivot pins 14.
• the legs of the member 12 are in turn provided with rigid guide blades 15 which are slidably engaged in guide slots in the brackets 14.
• the interengagement of the blades and brackets provides stable lateral location of the movable member relative to the fixed member.
• the blades 15 have curved upper edges and are provided at the free ends of those edges with abutments 16 co- operable with the upper edges of the guide slots to limit movement of the member 12 in direction away from the member 11.
• the movable member 12 is movable relative to the fixed member 11 between a first or closed setting in which it is supported against the member 11 (Fig. 3) and a second or open setting in which it is pivoted out from the member 11 (Fig. 4) and arrested by the abutments 16.
• the pivot axis defined by the pivot pins 14 is so disposed relative to the centre of gravity of the movable member 12 that the member 12 locates in either setting simply by gravity, each of the two settings thus being a stable rest setting.
• the member 12 is addditionally movable between the open rest setting and a transient setting which is spaced from the open rest setting by a small distance D in direction away from the closed rest setting, thus closer to the member 11.
• the transient- setting is unstable, as explained further below.
• the movable member T2 is provided on the top of its head portion with a lip 17 serving as a handle for movement of the member 12, in particular from the closed to the open rest setting.
• the transverse head portion of the fixed member 11 includes a protruding work face 18 with a row of three equidistantly spaced hooks
• the transverse head portion of the movable member 12 includes a recessed work face 20 with a row of three correspondingly spaced hooks 21. In the closed rest setting of the member 12, the two work faces
• Each of the hooks 19 and 21 consists of a shank part and a head part of flattened teardrop shape, the head part being considerably higher than the shank part.
• the hooks serve. for releasable retention of a bag 22 (Figs. 3 and 4) of thermoplastic plastics material, that is to say material that can be thermally welded.
• the bag shape is preferably, but not necessarily, elongate and with two major side walls joined together either directly or by way of gussets.
• the side walls can also be respective portions of a bag which, in fully opened state, is essentially tube-shaped.
• the bag is closed at its lower end and open at its upper end.
• each perforation has approximately the form of a slot which is horizontal in the bag position shown in Figs. 3 and 4.
• Such a bag is simply and easily attached to the members 11 and 12 by insertion of the head parts of the hooks 19 and 21 into corresponding ones of the perforations and pulling the bag down until the hook shank parts are seated in the perforations.
• the head portion of the member 12 is further provided on its work face 20, and below the hooks 21, with a rubber strip 23 which is compressible in cross-section without excessive force.
• the strip 23 has two functions. Firstly, it acts as a pressure and support element to support the movable member 12 relative to the fixed member 11 when the former is in the closed rest setting and, in this setting, to press the bag walls together as shown in Fig. 3. Secondly, the strip 23 provides a spring force which opposes movement of the member 12, by user pressure, from the closed rest setting into the transient rest setting and which returns the member 12 into the closed rest setting when pressure on the member 12 is released.
• the head portion of the member 11 is further provided on its work face 18, and below the hooks 19, with a heat sealing element 24 for sealing together the walls of the bag.
• the element has the form of a hot wire 25 sandwiched between two tapes 26 of heat-resistant material, such as woven glass-fibre.
• the tape facing outwardly of the work face-18 is preferably impregnated with a low-friction substance, for example polytetrafluoroethylene.
• the element 24, in particular the wire 25, is aligned with the rubber strip 23 in the closed rest setting of .the member 12 as shown in Fig. 3, the walls of the bag 22 thus being pressed by the strip 23 against the element 24.
• the wire 26 is connected at its ends to electrically conductive terminal yokes 27 by way of electrically conductive tension springs, which compensate for thermally-induced change in the length of the wire and keep it taut at all times.
• the yokes 27 locate in slots in the member 11 and act as heat sinks, so that current supply cables connected thereto can be of low temperature rating.
• the interior space of the head portion of the member 11 houses electrical actuating means for the heat sealing element, the actuating means comprising a transformer 28 connected between the hot wire 25 and mains terminals, a microswitch 29 between the transformer and the mains terminals, and a bimetallic switch 30 and indicator lamp 31 in series with the wire 25.
• the microswitch 29 is disposed in a depression in the work face 18 of the member 11 and is operable by a projection 32 on the work face 20 of the member 12. Operation of the microswitch 29 by the projection 32 takes place only in the transient setting of the member 12; in the closed rest setting of the member, the microswitch is unactuated.
• the microswitch When the microswitch is actuated, current heats the wire 25 and the bimetallic strip of the bimetallic switch 30 and illuminates the lamp 31.
• the switch 30 responds after a preset time, for example about five seconds, and terminates current supply to the wire 25 and the lamp 31.
• the lamp thus provides both a warning that the heat sealing element is in operation and an indication when the operation is terminated. Operation can also be terminated in advance of the preset time simply by allowing the member 12 to return to the first rest setting and thus release the microswitch.
• the fixed member 11 is attached to, for example, a wall by means of screws or other fastening devices extending in suitable openings in the member 11.
• a bag 22 is attached to the unit by insertion of the hooks 19 and 21 into the perforations in the bag side walls in the manner previously described.
• the bag can be filled while the member 12 is in the open rest setting.
• the member 12 is moved into the closed rest setting so that the bag is kept closed by the strip 23 under the weight of the member 12 together with, if considered desirable, a spring-loaded detent (not shown) releasably securing the members 11 and 12 together. Closure of the bag ensures that there is no escape of odour in the event that the bag is used for waste disposal.
• the bag When the bag is filled to the required degree it is permanently sealed at its upper end by means of the heat sealing element 24.
• the actuating means terminals connected to a mains supply, for example by way of a plug, the user presses the movable member 12 from the closed rest setting into the transient setting.
• the microswitch 29 is thus actuated as previously described and the heat sealing element 24 energised and lamp 31 illuminated.
• the heat of the element 24 fuses together the material of the two side walls of the bag to form a welded seam.
• the bimetallic switch 30 switches off the sealing element and lamp and the user can release pressure on the member 12 so that it is returned to the closed rest setting by the resilience of the strip 23.
• the sealed bag which by virtue of the sealing operation is separated or readily separable from the bag portions with the perforations, can now be removed and the member 12 moved into its open rest setting, with the perforated bag portions also being removed from the hooks.
• the unit is now ready to receive a fresh bag 22.
• the bag holding and sealing unit is simple and convenient to use and the bag can be left in an open state or a closed state as desired and without the need to maintain the open state against a spring return. Operation of the heat sealing means is by way of a small pressure on the movable member 12 and the control switching and timing incorporated in the actuating system ensure security against the possibility of accidental touching of the heating sealing element when in operation and prevent operation of the element for longer than necessary.
• the location of the microswitch 29 in a depression can be such that operation of the microswitch is not readily possible except by way of the projection 32 and the microswitch will normally be concealed by a wall of a bag even when the member 12 is in its open setting.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Package Closures (AREA)
• Supplying Of Containers To The Packaging Station (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10673545

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (2)

Citations (5)

Family Cites Families (2)

• 1990
  • 1990-03-30 GB GB9007146A patent/GB2242393B/en not_active Expired - Fee Related
• 1991
  • 1991-03-28 WO PCT/GB1991/000477 patent/WO1991015402A1/en active IP Right Grant
  • 1991-03-28 AU AU75436/91A patent/AU652148B2/en not_active Ceased
  • 1991-03-28 EP EP91906408A patent/EP0521939B1/de not_active Expired - Lifetime
  • 1991-03-28 DE DE69115897T patent/DE69115897D1/de not_active Expired - Lifetime
  • 1991-03-28 CA CA 2078991 patent/CA2078991A1/en not_active Abandoned

Patent Citations (5)

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