WO1989010324A1 - Portable electrically heated appliance employing fusible heat storage material - Google Patents

Portable electrically heated appliance employing fusible heat storage material Download PDF

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Publication number
WO1989010324A1
WO1989010324A1 PCT/US1989/001703 US8901703W WO8910324A1 WO 1989010324 A1 WO1989010324 A1 WO 1989010324A1 US 8901703 W US8901703 W US 8901703W WO 8910324 A1 WO8910324 A1 WO 8910324A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
appliance
stand
gun
alloy
Prior art date
Application number
PCT/US1989/001703
Other languages
French (fr)
Inventor
Eric Cunningham
Herbert Loeffler
Walter Stoeckman
Anthony Jairam
Anne Beirne
Original Assignee
Swingline Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Swingline Inc. filed Critical Swingline Inc.
Publication of WO1989010324A1 publication Critical patent/WO1989010324A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/00546Details of the heating means

Definitions

  • Electrically heated appliances such as glue guns, hair-curling irons, soldering irons and so forth require a supply of heat to control the state of fluidity of the fusible material or to control the temperature of other substances to be heated for selected periods of time to attain temperatures for obtaining necessary flow characteristics or for other purposes.
  • heating has been accomplished by heating a portion of the appliance using a selected electrical heating element connected to a source of electricity such as an electrical outlet.
  • a source of electricity such as an electrical outlet.
  • the present invention is a portable appliance heating unit comprising a housing having therein a heat source element (preferably an electrical heating element) , a sealable chamber in the housing and a low melting point metal in the sealable chamber.
  • the heating unit is located adjacent the material to be heated such as a glue stick, a hank of human hair, solder, or other substances to be heated.
  • the material to be heated may be positioned in the heating unit in an adjacent holding and dispensing chamber.
  • Fig. 1 is side elevational view of a portable glue gun appliance with its stand;
  • Fig. 2 is a sectional view taken along lines 2-2 of Fig. 1;
  • Fig. 3 is a partial perspective view of the heating unit of the glue gun.
  • appliance glue gun 9 includes movable hand-held appliance section 10, body 11 with handle 12 and trigger mechanism 13.
  • Heating unit 16 - within body 11 includes housing 17 containing a glue stick chamber 18 which accommodates a glue stick 19.
  • Glue stick chamber 18 projects from the appliance body 11 and includes an orifice applicator tip-21. Since glue stick 19 is shaped to fit loosely in chamber 18 it is held in its initial rest- position by rubber socket 22 and coil spring 23. Glue stick 19 is urged to the right, as shown in Fig. 1, and is extruded through orifice tip 21 for deposit on a selected surface.
  • the mechanical arrangement for moving the stick 19 includes lever 36 cammed by the action of trigger 35. Also shown is glue stick gripper 30, linkage 36a and return spring 37.
  • Metal chamber 26 houses, with its force-fit sealable cap 27, low-melting-point metal alloy stick 28
  • Heater 31 comprising an insulated element 32 and electrical resistance element within the insulated element (not shown) having electrical leads 33a, 33b which heater 31 is positioned in housing 17 adjacent glue chamber 18 and metallic chamber 26.
  • appliance 9 is initially situated on stand 40 which rests on surface 40a (such surface being normally horizontal but tipped in Fig. 1 for illustrative
  • appliance 9 with respect to providing heat to glue stick 19, is based on fashioning appliance housing 17 of selected material with a
  • Housing 17 is preferably made of cast metal having some heat holding capacity.
  • Heater 31 is employed to heat the metal alloy 28 to its melting temperature and above.
  • latent heat of fusion of the low-melting-point metal alloy 35 28 is also used to provide heat to glue stick 19 as cooling of the stand-removed appliance section 10 reaches a temperature level at which solidification of the low- melting-point metal 28 or a portion thereof takes place.
  • the weight of the low-melting-point metal 28 for the appliance shown is about 3.4 ounces but it can vary between 3 ounces and 5 ounces.
  • Low-melting-point metal 28 is an alloy of about 60% tin and 40% lead having a melting point of about 10' Fahrenheit above the glue stick application- ready temperature range. This alloy has been selected as preferable so that as the alloy metal 28 goes from liquid to solid at its melting temperature heat transfers from the alloy to the glue stick to hold the stick in its application-ready range. As solidification or fusion takes place heat is liberated from alloy metal 28 which heat is transferred to the glue stick to help sustain glue stick 19 in its application-ready range for an extended period while appliance section 10 remains removed from its stand 40.
  • Latent heat of solidification refers to the heat transferred into and out of substances accompanying the change of state of the substance at a constant temperature.
  • metallic substances that are solid at room temperature such as tin-lead alloys
  • the latent heat which is transferred from the alloys during fusion (solidification) at the fusion .temperatures is known as the heat of fusion. (See the following Table ' 1 including certain melting points) .
  • appliance section 10 Once appliance section 10 has cooled to a point that glue application " is no longer possible or desirable, appliance section 10 is replaced on stand 40, the electrical connections restored and heater 31 will heat the low- melting-point metal 28 back to its molten or liquid state. & The appliance 10 is then again ready for use.

Abstract

The heating unit (16) of a hand-held electrically heated glue gun (10) has an electric heater (31) for heating a glue stick (19) to its application-ready temperature prior to being extruded through an orifice applicator tip (21). The unit (16) includes a chamber (26) containing a low melting point alloy (28) heat storage material, e.g., 60 % tin and 48 % lead, having a melting point above the application-ready temperature of the glue stick (19), in heat exchange relationship therewith and the heater (31). The gun (10) is initially situated on a stand (40) for energization of the heater (31) to raise the alloy (28) to above its melting temperature. After the alloy (28) is melted, the gun (10) is removed from the stand for use to deenergize the heater (31). During use, latent heat of fusion, released as the alloy (28) solidifies, sustains the glue stick (19) in its application-ready temperature range for an extended period before the gun (10) must be returned to the stand (40) to remelt the heat storage material for subsequent use of the gun.

Description

PORTABLE ELECTRICALLY HEATED APPLIANCE EMPLOYING
FUSIBLE HEAT STORAGE MATERIAL
Background of the Invention
Electrically heated appliances such as glue guns, hair-curling irons, soldering irons and so forth require a supply of heat to control the state of fluidity of the fusible material or to control the temperature of other substances to be heated for selected periods of time to attain temperatures for obtaining necessary flow characteristics or for other purposes.
In prior appliances, heating has been accomplished by heating a portion of the appliance using a selected electrical heating element connected to a source of electricity such as an electrical outlet. When such an appliance is to be moved to a work location distant from the electric source, it is unplugged and the appliance thereafter cools at a rate dependent on the amount of heat then in the appliance, the temperature differentials involved and other variables effecting heat transfer from the appliance to its surrounding environment.
Prior appliances with stationary heat sinks have been proposed: U. S. Patent No. 3,430,816. Soldering pens in which solder metal is heated to a- molten state have been disclosed but the use of heated solder has not been suggested as a source of heat: U. S. Patent No. 3,876,857.
Portable appliances for dispensing hot melt adhesives are old: U. S. Patent No. 3,970,395 and heat exchanger shape and size design have been proposed for controlling the consistency of adhesions over time: U. s. Patent No. 4,601,597.
None of the prior proposals provide an appliance with sufficient lasting heat capacity to give satisfactory results. Summary of the Invention
Broadly, the present invention is a portable appliance heating unit comprising a housing having therein a heat source element (preferably an electrical heating element) , a sealable chamber in the housing and a low melting point metal in the sealable chamber. The heating unit is located adjacent the material to be heated such as a glue stick, a hank of human hair, solder, or other substances to be heated.
It is a feature of the invention that the material to be heated may be positioned in the heating unit in an adjacent holding and dispensing chamber.
Brief Description of the Drawings
Fig. 1 is side elevational view of a portable glue gun appliance with its stand;
Fig. 2 is a sectional view taken along lines 2-2 of Fig. 1; and
Fig. 3 is a partial perspective view of the heating unit of the glue gun.
Description of the Preferred Embodiment
Referring to the Figures, appliance glue gun 9 includes movable hand-held appliance section 10, body 11 with handle 12 and trigger mechanism 13. Heating unit 16 - within body 11 includes housing 17 containing a glue stick chamber 18 which accommodates a glue stick 19. Glue stick chamber 18 projects from the appliance body 11 and includes an orifice applicator tip-21. Since glue stick 19 is shaped to fit loosely in chamber 18 it is held in its initial rest- position by rubber socket 22 and coil spring 23. Glue stick 19 is urged to the right, as shown in Fig. 1, and is extruded through orifice tip 21 for deposit on a selected surface. The mechanical arrangement for moving the stick 19 includes lever 36 cammed by the action of trigger 35. Also shown is glue stick gripper 30, linkage 36a and return spring 37.
Metal chamber 26 houses, with its force-fit sealable cap 27, low-melting-point metal alloy stick 28
(shown in a broken view for illustrative purposes) in its 5 solid or liquid form as further described. Heater 31 comprising an insulated element 32 and electrical resistance element within the insulated element (not shown) having electrical leads 33a, 33b which heater 31 is positioned in housing 17 adjacent glue chamber 18 and metallic chamber 26.
It is seen that both glue stick 19 and metal alloy 28 are heated by heater 31 as further explained.'
In operation, appliance 9 is initially situated on stand 40 which rests on surface 40a (such surface being normally horizontal but tipped in Fig. 1 for illustrative
15 purposes) having two (2) sockets 41, 42; one socket 42 to receive power cord 43 and the other socket 41 serves to transfer power to appliance section 10 through appliance inlet socket 46. When the portable appliance section 10 is taken off stand 40, electrical heater 31 is disconnected and
_tr\ no further heat is thereafter supplied to appliance section 10.until it is replaced on stand 40.
The principle of operation of appliance 9, with respect to providing heat to glue stick 19, is based on fashioning appliance housing 17 of selected material with a
^5 shape and size to transfer heat for use in maintaining the heating and melting conditions of the glue stick for as long a time as practicable. As glue stick 19 cools and solidifies to a certain consistency, application of glue through tip 21 can no longer be effectively continued.
30 Housing 17 is preferably made of cast metal having some heat holding capacity. Heater 31 is employed to heat the metal alloy 28 to its melting temperature and above. In addition to the capacity of the heat-holding metal of housing 17, latent heat of fusion of the low-melting-point metal alloy 35 28 is also used to provide heat to glue stick 19 as cooling of the stand-removed appliance section 10 reaches a temperature level at which solidification of the low- melting-point metal 28 or a portion thereof takes place. The weight of the low-melting-point metal 28 for the appliance shown is about 3.4 ounces but it can vary between 3 ounces and 5 ounces. Low-melting-point metal 28 is an alloy of about 60% tin and 40% lead having a melting point of about 10' Fahrenheit above the glue stick application- ready temperature range. This alloy has been selected as preferable so that as the alloy metal 28 goes from liquid to solid at its melting temperature heat transfers from the alloy to the glue stick to hold the stick in its application-ready range. As solidification or fusion takes place heat is liberated from alloy metal 28 which heat is transferred to the glue stick to help sustain glue stick 19 in its application-ready range for an extended period while appliance section 10 remains removed from its stand 40.
Latent heat of solidification refers to the heat transferred into and out of substances accompanying the change of state of the substance at a constant temperature. For metallic substances that are solid at room temperature, such as tin-lead alloys, the latent heat which is transferred from the alloys during fusion (solidification) at the fusion .temperatures is known as the heat of fusion. (See the following Table '1 including certain melting points) .
Table 1
Heat of Fusion Melting Point
Substant z.e Btu/per Lb. "F.
Silver 26.2 1760.9
Sodium 49.5 207.1
Tin 25.4 449.4
Zinc 46.8 787.1
Alloys:
30.5 Pb+69, .5 Sn 30.6 —
36.9 Pb+61. .3 Sn 28.0 —
38.0 Pb+62. .0 Sn — 361.0
63.7 Pb+36. .3 Sn 11.6 —
77.8 Pb+22. .2 Sn 17.0 — 5 78.4 Sn+21. ,6 Zn 42.3 —
93.56 Sn+6. .44r Zn 31.8 —
97.32 . Sn+2. , 6.t Zn 27.2 ——
0 Once appliance section 10 has cooled to a point that glue application"is no longer possible or desirable, appliance section 10 is replaced on stand 40, the electrical connections restored and heater 31 will heat the low- melting-point metal 28 back to its molten or liquid state. & The appliance 10 is then again ready for use.
0
5

Claims

We Claim:
1. A portable appliance having a housing, a heat- generating element, and a heat-holding element, the improvement comprising a) a quantity of low-melting-point metal positioned in and forming a part of the heat-holding element; and b) the heat-generating element capable of melting the metal alloy and thereafter allowing it to solidify and transfer latent heat of fusion from the metal alloy to the housing.
2. The appliance of claim 1 having a quantity of adhesive in the appliance which adhesive receives latent heat of fusion from such metallic portion as it solidifies.
3. The appliance of claim 1 having a hand-held portable section and a stand with the portable section having as its heat-generating element an electric heat source powered through the stand such that when the portable section is moved away from the stand the electric heat source is turned off.
4. The appliance of claim 1 in which such portion of metal alloy is housed in the portable section in a sealable chamber.
PCT/US1989/001703 1988-04-25 1989-04-24 Portable electrically heated appliance employing fusible heat storage material WO1989010324A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18778588A 1988-04-25 1988-04-25
US187,785 1988-04-25

Publications (1)

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WO1989010324A1 true WO1989010324A1 (en) 1989-11-02

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5215230A (en) * 1991-07-22 1993-06-01 Homeease Industrial Co., Ltd. Trigger mechanism for glue gun
FR2739264A1 (en) * 1995-10-03 1997-04-04 Seb Sa APPLICATION KIT AND WAX APPLICATOR
FR2739266A1 (en) * 1995-10-03 1997-04-04 Seb Sa APPLICATOR AND APPLICATOR ASSEMBLY OF THERMAL MELT
WO2000053338A3 (en) * 1999-03-05 2001-01-11 Steinel Gmbh & Co Kg Hot melt applicator
WO2006066129A2 (en) * 2004-12-17 2006-06-22 Black & Decker Inc. Glue gun assembly with temperature indicator and drip reducing base
US11858106B2 (en) 2019-08-08 2024-01-02 Black & Decker Inc. Power tools and power tools platform

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1432864A (en) * 1919-11-11 1922-10-24 Western Electric Co Heating device
US1602266A (en) * 1923-12-11 1926-10-05 Firm Spezialbronzen Und Metall Soldering bit
US2066127A (en) * 1929-11-07 1936-12-29 Games Slayter Inc Electrical heating system
US2236837A (en) * 1939-04-11 1941-04-01 Kindt Collins Co Glue pot
US2338691A (en) * 1939-12-18 1944-01-04 Hydraulic Dev Corp Inc Molten metal for temperature control
US2534257A (en) * 1947-01-23 1950-12-19 Margaret Thurston Flournoy Soldering iron
US2584999A (en) * 1947-01-24 1952-02-12 Margaret Thurston Flournoy Curling iron
US3419666A (en) * 1967-12-29 1968-12-31 David W. Groom Electric furnace
US3430816A (en) * 1967-08-17 1969-03-04 Daubert Chem Co Apparatus for dispensing adhesive materials
US3513290A (en) * 1967-04-20 1970-05-19 Wallace L Burley Automatically heated ice-cream scoop with stand
US4692587A (en) * 1986-02-19 1987-09-08 Spirk Jr John W Hand tool and support

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1432864A (en) * 1919-11-11 1922-10-24 Western Electric Co Heating device
US1602266A (en) * 1923-12-11 1926-10-05 Firm Spezialbronzen Und Metall Soldering bit
US2066127A (en) * 1929-11-07 1936-12-29 Games Slayter Inc Electrical heating system
US2236837A (en) * 1939-04-11 1941-04-01 Kindt Collins Co Glue pot
US2338691A (en) * 1939-12-18 1944-01-04 Hydraulic Dev Corp Inc Molten metal for temperature control
US2534257A (en) * 1947-01-23 1950-12-19 Margaret Thurston Flournoy Soldering iron
US2584999A (en) * 1947-01-24 1952-02-12 Margaret Thurston Flournoy Curling iron
US3513290A (en) * 1967-04-20 1970-05-19 Wallace L Burley Automatically heated ice-cream scoop with stand
US3430816A (en) * 1967-08-17 1969-03-04 Daubert Chem Co Apparatus for dispensing adhesive materials
US3419666A (en) * 1967-12-29 1968-12-31 David W. Groom Electric furnace
US4692587A (en) * 1986-02-19 1987-09-08 Spirk Jr John W Hand tool and support

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5215230A (en) * 1991-07-22 1993-06-01 Homeease Industrial Co., Ltd. Trigger mechanism for glue gun
FR2739264A1 (en) * 1995-10-03 1997-04-04 Seb Sa APPLICATION KIT AND WAX APPLICATOR
FR2739266A1 (en) * 1995-10-03 1997-04-04 Seb Sa APPLICATOR AND APPLICATOR ASSEMBLY OF THERMAL MELT
EP0766938A1 (en) * 1995-10-03 1997-04-09 Seb S.A. Applicator unit and applicator for hot melt products
EP0766936A1 (en) * 1995-10-03 1997-04-09 Seb S.A. Applicator assembly and depilatory wax applicator
US5816726A (en) * 1995-10-03 1998-10-06 Seb S.A. Hair removal applicator and application system
US5831245A (en) * 1995-10-03 1998-11-03 Seb S.A. Electronically heated handheld applicator for thermofusible material with power supply block functioning as a support
WO2000053338A3 (en) * 1999-03-05 2001-01-11 Steinel Gmbh & Co Kg Hot melt applicator
US6527143B1 (en) 1999-03-05 2003-03-04 Steinel Gmbh & Co. Kg Hot melt applicator
WO2006066129A2 (en) * 2004-12-17 2006-06-22 Black & Decker Inc. Glue gun assembly with temperature indicator and drip reducing base
WO2006066129A3 (en) * 2004-12-17 2006-10-26 Black & Decker Inc Glue gun assembly with temperature indicator and drip reducing base
US11858106B2 (en) 2019-08-08 2024-01-02 Black & Decker Inc. Power tools and power tools platform

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