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US2579088A - Heat sealing tool - Google Patents

Heat sealing tool Download PDF

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Publication number
US2579088A
US2579088A US12340449A US2579088A US 2579088 A US2579088 A US 2579088A US 12340449 A US12340449 A US 12340449A US 2579088 A US2579088 A US 2579088A
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US
United States
Prior art keywords
tool
heat sealing
jaw
slot
jaw members
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Thomas E Piazze
Bert W Martin
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Shellmar Products Corp
Original Assignee
Shellmar Products Corp
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Priority to US12340449 priority Critical patent/US2579088A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8227—Transmission mechanisms using springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • B29C66/83241—Joining or pressing tools pivoting around one axis cooperating pivoting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • B29C66/8614—Tongs, pincers or scissors
    • 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/148—Hand-operated members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/18—Surface bonding means and/or assembly means with handle or handgrip

Definitions

  • This invention relates to heat sealing mechanisms and is more particularly concerned with improvements in a hand tool especially adapted for use in heat sealing the top of a filled bag.
  • It is a more specific object of the invention to provide improvements in a heat sealer which comprises a pair of pivotally related jaw-like members, one of which has incorporated there in an electrical resistance element for providing radiant heat and the other of which includes a folder blade adapted to engage the top of a bag to be sealed on the opposite side of the same and move it to a position adjacent the resistance element to permit the bag top material to be fused by heat radiating from the resistance element and to form therein a bead-like seal.
  • It is a further object of the invention to provide a heat sealing tool comprising a pair of pivotally connected elongate members having handle forming end portions extending on one side of the pivotal connection and sealing jaw forming portions extending on the opposite side thereof, a radiant heating element positioned in a slotted recess in one of the jaws and a relatively narrow blade-like element projecting in opposed relation thereto from the other jaw whereby a flat folded top portion of a filled bag or the like may be positioned between the jaws and upon closing of the jaws the blade will force the same into the recess to place folded portions of the material in close contacting relation and within the effective heating range of the radiant heating element for a sufiicient length of time to fuse the material and provide a transverse seal on the bag top.
  • Fig. 1 is a side elevation of a heat sealing tool embodying the principles of the invention
  • Fig. 2 is a cross section, to an enlarged scale, taken generally on the line 2-2 of Fig. 1 showing the sealing jaws in open position;
  • Fig. 3 is a cross section similar to that shown in Fig. 2 but with the sealing jaw in the closed position;
  • Fig. 4 is a partial side elevation of a bag which has been sealed with the tool.
  • a heat sealing tool H! which incorporates therein the principles of the invention and which is particularly adapted for home use in sealing the tops of flexible bags of heat-sealable material such as frozen food bags or the like.
  • the illustrated tool comprises a pair of elongate members having jaw-like end portions H and [2 which are pivotally connected at it.
  • the pivoted members are provided with handle forming end portions l4 and I5 projecting in the opposite direction beyond the pivot point it.
  • the jaw member ii comprises an outer shell or casing l6 which is generally circular in cross section, forming a tube-like member, and provided with axially extending flanges ii and id in circumferential spaced relation defining an axially extending slot or opening I9 on the inner side thereof.
  • An insulated holder member 20 is enclosed within the casing l6 and provided with an axially extending slot 2:! which is arranged in alignment with the casing opening IS.
  • a radiant heating element such as a nichrome wire or other electrical resistance member 22 is arranged in the bottom of the slot 26 and connected by appropriate wiring 23 which extends through the handle portion M to a source of electric current. The heating element 22 is adapted to be energized when current is applied through the wire 23 and to provide radiant heat.
  • the jaw member i2 is provided with a relatively narrow folding blade 2R projecting inwardly in opposed and aligned relation with the opening #9 in the jaw H.
  • the projecting portion of the folding blade 24 is somewhat narrower than the opening i9 and is adapted to be moved therethrough and into the slot 2i when the jaws are moved toward each other.
  • the jaw members H and i2 are normally held in the open position by a spring 25 which is arranged to extend between the handle por tions it and I5 and which urges the jaw members I! and i2 into the open position.
  • Control of the current in the wiring 23 is provided by cooperating switch elements 28 and 2'! on the jaw members H and I2 adjacent the pivot point IS.
  • the switch members 25 and 27 are arranged so that when the jaw members H and 82 are brought towards each other, the circuit is closed and current is supplied to the resistance element 22. When the sealing jaws II and 12 are moved away from each other, the switch members 26 and 21 are separated and the current supply is cut 011.
  • the contact elements of the switch 28, 21 may act as a stop to limit the movement of the blade 24 into the opening
  • the top portions 28 of the filled bag 29 are flat folded into contacting rela tion.
  • the tool in is then positioned with the jaws II and I2 on opposite sides of the flat faces of the bag top portions 28.
  • the handles l4 and 15 are thereafter moved toward each other against the action of the spring 25 and the blade 24 is brought into contacting relation with the bag top 28, forcing the material of the top 28 into the slotted opening l9, 2
  • the laws ll, l2 are held in the closed position a sufiicient length of time to permit the' moval from the tool l0.
  • Radiant heat may be supplied in the tool by substituting any other suitable material for the resistance element 22.
  • the tool is particularly adapted for use with bags formed of polyethelene material or material of a similar character which has the ability to melt or fuse when subjected to radiant heat and to form, when cooled, an integral bead-like seal.
  • a heat sealing tool comprising a pair of jaw members connected for movement toward and fro meach other, one of said jaw members being provided with a relatively narrow axial slot of substantial depth, a radiant heating element positioned within said slot and a folding blade on the other of said jaw members in aligned relation with said slot, said blade being arranged to extend into said slot upon movement of the jaw members toward each other to a position spaced from said heating element and from the side walls defining said slot.
  • a pair of elongate members pivotally connected intermediate their ends and providing jaw members at one end and handle extensions at the other end for moving the jaw members into pie-determined closed position, one of said Jaw members having a relatively narrow axially extending slot of substantial depth, a radiant heating element positioned in the bottom of said slot in said jaw member, and the other of said Jaw members having a blade portion in alignment with said slot, said blade portion being movable to a predetermined position in said slot spaced from said heating element when said jaw members are moved into closed position.
  • a pair of pivotally connected Jaw members having handle exten; sions for moving the jaw members toward and away from each other, one of said jaw members having a relatively narrow axially extending slot of substantial depth, a radiant heating element positioned within the slot in said jaw member, the other of said jaw members having a projecting blade in alignment with said slot and in opposed relation to said element, means connecting said heating element with a source of electric current. and cooperating switch elements on said jaw members adjacent the pivotal connection thereof for controlling said current.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Package Closures (AREA)

Description

Dec. 18, 1951 T. E. PIAZZE ET AL HEAT SEALING TOOL Filed Oct. 25. 1949 Patented Dec. 18, 1951 I HEAT SEALING TOOL Thomas E. Piazze and Bert W. Martin, Mount Vernon, Ohio, assignors to Shellmar Products Corporation, Chicago, 111., a corporation of Delaware Application October 25, 1949, Serial No. 123,404
3 Claims. (Cl. 154-42) This invention relates to heat sealing mechanisms and is more particularly concerned with improvements in a hand tool especially adapted for use in heat sealing the top of a filled bag.
It is a general object of the invention to provide a hand tool for use in connection with the closing and sealing of the top of a bag, which tool is simple in construction, easy to operate and economical to manufacture and which will apply to the closed top of the bag a transverse bead-like seal formation.
It is a more specific object of the invention to provide improvements in a heat sealer which comprises a pair of pivotally related jaw-like members, one of which has incorporated there in an electrical resistance element for providing radiant heat and the other of which includes a folder blade adapted to engage the top of a bag to be sealed on the opposite side of the same and move it to a position adjacent the resistance element to permit the bag top material to be fused by heat radiating from the resistance element and to form therein a bead-like seal.
It is a further object of the invention to provide a heat sealing tool comprising a pair of pivotally connected elongate members having handle forming end portions extending on one side of the pivotal connection and sealing jaw forming portions extending on the opposite side thereof, a radiant heating element positioned in a slotted recess in one of the jaws and a relatively narrow blade-like element projecting in opposed relation thereto from the other jaw whereby a flat folded top portion of a filled bag or the like may be positioned between the jaws and upon closing of the jaws the blade will force the same into the recess to place folded portions of the material in close contacting relation and within the effective heating range of the radiant heating element for a sufiicient length of time to fuse the material and provide a transverse seal on the bag top.
These and other objects of the invention will be apparent from a consideration of the tool which is shown by way of illustration in the accompanying drawings wherein:
Fig. 1 is a side elevation of a heat sealing tool embodying the principles of the invention;
Fig. 2 is a cross section, to an enlarged scale, taken generally on the line 2-2 of Fig. 1 showing the sealing jaws in open position;
Fig. 3 is a cross section similar to that shown in Fig. 2 but with the sealing jaw in the closed position; and
Fig. 4 is a partial side elevation of a bag which has been sealed with the tool.
Referring to the drawings, there is'illustrated a heat sealing tool H! which incorporates therein the principles of the invention and which is particularly adapted for home use in sealing the tops of flexible bags of heat-sealable material such as frozen food bags or the like.
The illustrated tool In comprises a pair of elongate members having jaw-like end portions H and [2 which are pivotally connected at it. The pivoted members are provided with handle forming end portions l4 and I5 projecting in the opposite direction beyond the pivot point it.
The jaw member ii comprises an outer shell or casing l6 which is generally circular in cross section, forming a tube-like member, and provided with axially extending flanges ii and id in circumferential spaced relation defining an axially extending slot or opening I9 on the inner side thereof. An insulated holder member 20 is enclosed within the casing l6 and provided with an axially extending slot 2:! which is arranged in alignment with the casing opening IS. A radiant heating element such as a nichrome wire or other electrical resistance member 22 is arranged in the bottom of the slot 26 and connected by appropriate wiring 23 which extends through the handle portion M to a source of electric current. The heating element 22 is adapted to be energized when current is applied through the wire 23 and to provide radiant heat.
The jaw member i2 is provided with a relatively narrow folding blade 2R projecting inwardly in opposed and aligned relation with the opening #9 in the jaw H. The projecting portion of the folding blade 24 is somewhat narrower than the opening i9 and is adapted to be moved therethrough and into the slot 2i when the jaws are moved toward each other.
The jaw members H and i2 are normally held in the open position by a spring 25 which is arranged to extend between the handle por tions it and I5 and which urges the jaw members I! and i2 into the open position. Control of the current in the wiring 23 is provided by cooperating switch elements 28 and 2'! on the jaw members H and I2 adjacent the pivot point IS. The switch members 25 and 27 are arranged so that when the jaw members H and 82 are brought towards each other, the circuit is closed and current is supplied to the resistance element 22. When the sealing jaws II and 12 are moved away from each other, the switch members 26 and 21 are separated and the current supply is cut 011. The contact elements of the switch 28, 21 may act as a stop to limit the movement of the blade 24 into the opening In using the tool the top portions 28 of the filled bag 29 are flat folded into contacting rela tion. The tool in is then positioned with the jaws II and I2 on opposite sides of the flat faces of the bag top portions 28. The handles l4 and 15 are thereafter moved toward each other against the action of the spring 25 and the blade 24 is brought into contacting relation with the bag top 28, forcing the material of the top 28 into the slotted opening l9, 2| and stretching the folded material over the edge of the blade 24 to hold the same in close relation at a pre-determined spaced distance from the radiant heating member 22. The laws ll, l2 are held in the closed position a sufiicient length of time to permit the' moval from the tool l0.
Radiant heat may be supplied in the tool by substituting any other suitable material for the resistance element 22.
The tool is particularly adapted for use with bags formed of polyethelene material or material of a similar character which has the ability to melt or fuse when subjected to radiant heat and to form, when cooled, an integral bead-like seal.
While specific materials and details of construction have been referred to in describing the illustrated form of the device, it will be understood that other materials and other details of construction may be resorted to within the spirit of the invention.
We claim:
1. A heat sealing tool comprising a pair of jaw members connected for movement toward and fro meach other, one of said jaw members being provided with a relatively narrow axial slot of substantial depth, a radiant heating element positioned within said slot and a folding blade on the other of said jaw members in aligned relation with said slot, said blade being arranged to extend into said slot upon movement of the jaw members toward each other to a position spaced from said heating element and from the side walls defining said slot.
2. In a heat sealing tool a pair of elongate members pivotally connected intermediate their ends and providing jaw members at one end and handle extensions at the other end for moving the jaw members into pie-determined closed position, one of said Jaw members having a relatively narrow axially extending slot of substantial depth, a radiant heating element positioned in the bottom of said slot in said jaw member, and the other of said Jaw members having a blade portion in alignment with said slot, said blade portion being movable to a predetermined position in said slot spaced from said heating element when said jaw members are moved into closed position.
3. In a heat sealing tool, a pair of pivotally connected Jaw members having handle exten; sions for moving the jaw members toward and away from each other, one of said jaw members having a relatively narrow axially extending slot of substantial depth, a radiant heating element positioned within the slot in said jaw member, the other of said jaw members having a projecting blade in alignment with said slot and in opposed relation to said element, means connecting said heating element with a source of electric current. and cooperating switch elements on said jaw members adjacent the pivotal connection thereof for controlling said current.
THOMAS E. PIAZZE. BERT W. MARTIN.
REFERENCES CITED The-following references are of record in the
US12340449 1949-10-25 1949-10-25 Heat sealing tool Expired - Lifetime US2579088A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2669642A (en) * 1951-11-13 1954-02-16 Lillian L Menges Electrically heated marking device
US2678679A (en) * 1951-08-18 1954-05-18 Bergstein Frank David Bottom sealing means and method for plastic bags
US2711469A (en) * 1952-02-25 1955-06-21 Lindsay Wire Weaving Co Tool for applying edge reinforcement to paper making woven wire belt
DE1043786B (en) * 1952-03-10 1958-11-13 Hesser Ag Maschf Device for making inner bags from plastic or metal foils and. Like. For packs consisting of inner and outer sleeves
US2881577A (en) * 1954-04-16 1959-04-14 Cal Tronics Corp Tool for applying heat sealable cable bands
US3009852A (en) * 1960-01-22 1961-11-21 Walter L Gruner Plastic tag and applying tongs therefor
US3031561A (en) * 1959-08-05 1962-04-24 Joseph L Shaffer Device to serve rope ends
US3200028A (en) * 1961-10-06 1965-08-10 Dow Chemical Co Hand tool for sealing thermoplastic surfaced members
US3408478A (en) * 1965-06-01 1968-10-29 Penn Joseph Dewey Tool for welding the edges of plastic sheets together
US3668033A (en) * 1966-10-14 1972-06-06 Royal Industries Laminating method and apparatus
US4684425A (en) * 1984-08-16 1987-08-04 Bannister Brian C Method of making cloth covered panels having edging strips
US20180346169A1 (en) * 2017-06-01 2018-12-06 Brainchild Concepts, Llc System and method for sealing a plastic enclosure
WO2021173183A1 (en) * 2019-03-01 2021-09-02 Juli Lank System and method for sealing a plastic enclosure
USD939601S1 (en) * 2021-04-13 2021-12-28 Zhenfeng Wang Sealing machine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191408814A (en) * 1913-05-06 1914-07-30 Joseph Andrew Chapman Improvements in and relating to Electrically Heated Instruments.
US1882925A (en) * 1927-10-03 1932-10-18 Western Electric Co Method of sealing materials
US2189431A (en) * 1936-05-27 1940-02-06 Humoco Corp Method of making impervious bags
US2263152A (en) * 1940-05-09 1941-11-18 Oswego Falls Corp Container closure sealing tool
US2441817A (en) * 1946-04-26 1948-05-18 Victor C Huff Sealing tongs
US2443749A (en) * 1946-01-19 1948-06-22 Benjamin J Audette Sealing device
US2477467A (en) * 1947-09-03 1949-07-26 Alan C Davis Soldering tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191408814A (en) * 1913-05-06 1914-07-30 Joseph Andrew Chapman Improvements in and relating to Electrically Heated Instruments.
US1882925A (en) * 1927-10-03 1932-10-18 Western Electric Co Method of sealing materials
US2189431A (en) * 1936-05-27 1940-02-06 Humoco Corp Method of making impervious bags
US2263152A (en) * 1940-05-09 1941-11-18 Oswego Falls Corp Container closure sealing tool
US2443749A (en) * 1946-01-19 1948-06-22 Benjamin J Audette Sealing device
US2441817A (en) * 1946-04-26 1948-05-18 Victor C Huff Sealing tongs
US2477467A (en) * 1947-09-03 1949-07-26 Alan C Davis Soldering tool

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678679A (en) * 1951-08-18 1954-05-18 Bergstein Frank David Bottom sealing means and method for plastic bags
US2669642A (en) * 1951-11-13 1954-02-16 Lillian L Menges Electrically heated marking device
US2711469A (en) * 1952-02-25 1955-06-21 Lindsay Wire Weaving Co Tool for applying edge reinforcement to paper making woven wire belt
DE1043786B (en) * 1952-03-10 1958-11-13 Hesser Ag Maschf Device for making inner bags from plastic or metal foils and. Like. For packs consisting of inner and outer sleeves
US2881577A (en) * 1954-04-16 1959-04-14 Cal Tronics Corp Tool for applying heat sealable cable bands
US3031561A (en) * 1959-08-05 1962-04-24 Joseph L Shaffer Device to serve rope ends
US3009852A (en) * 1960-01-22 1961-11-21 Walter L Gruner Plastic tag and applying tongs therefor
US3200028A (en) * 1961-10-06 1965-08-10 Dow Chemical Co Hand tool for sealing thermoplastic surfaced members
US3408478A (en) * 1965-06-01 1968-10-29 Penn Joseph Dewey Tool for welding the edges of plastic sheets together
US3668033A (en) * 1966-10-14 1972-06-06 Royal Industries Laminating method and apparatus
US4684425A (en) * 1984-08-16 1987-08-04 Bannister Brian C Method of making cloth covered panels having edging strips
US20180346169A1 (en) * 2017-06-01 2018-12-06 Brainchild Concepts, Llc System and method for sealing a plastic enclosure
WO2019231494A1 (en) * 2017-06-01 2019-12-05 Brainchild Concepts, Llc Aparatuses and method for sealing a plastic enclosure
US10934041B2 (en) * 2017-06-01 2021-03-02 Bcc Product Development, L.L.C. System and method for sealing a plastic enclosure
WO2021173183A1 (en) * 2019-03-01 2021-09-02 Juli Lank System and method for sealing a plastic enclosure
US11772333B2 (en) 2019-03-01 2023-10-03 Brainchild Concepts, Llc System and method for sealing a plastic enclosure
USD939601S1 (en) * 2021-04-13 2021-12-28 Zhenfeng Wang Sealing machine

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