WO2001060576A1 - Implements and their manufacture - Google Patents

Implements and their manufacture Download PDF

Info

Publication number
WO2001060576A1
WO2001060576A1 PCT/GB2001/000136 GB0100136W WO0160576A1 WO 2001060576 A1 WO2001060576 A1 WO 2001060576A1 GB 0100136 W GB0100136 W GB 0100136W WO 0160576 A1 WO0160576 A1 WO 0160576A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
overmoulded
implement
projection
thermoplastic material
Prior art date
Application number
PCT/GB2001/000136
Other languages
French (fr)
Inventor
Simon Bathard
Original Assignee
Fiskars Uk Limited
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 Fiskars Uk Limited filed Critical Fiskars Uk Limited
Priority to AU2001228624A priority Critical patent/AU2001228624A1/en
Publication of WO2001060576A1 publication Critical patent/WO2001060576A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/10—Handle constructions characterised by material or shape
    • B25G1/102—Handle constructions characterised by material or shape the shape being specially adapted to facilitate handling or improve grip

Definitions

  • the invention relates to a method of forming a handle for an implement and to
  • An implement such as a knife is provided with a handle in the form of a body that can
  • handle for an implement comprising providing on the implement a body of a first
  • thermoplastic material and then overmoulding the body with a layer of a second
  • the bonding between the body and the layer prevents the ingress of water
  • a handle formed by a body of a first thermoplastic mate ⁇ al with a layer of a second thermoplastic mate ⁇ al overmoulded on at least a part of the body to bond
  • Figure 1 is a side elevation of a knife in a first stage of manufacture having a handle
  • Figure 2 is a part plan view from above of the body of Figure 1 ,
  • Figure 3 is a section on a line A-A of Figure 1 ,
  • Figure 4 is a similar view to Figure 1 but showing the knife in a second stage of
  • Figure 5 is a plan view from above of a part of the knife of Figure 4,
  • Figure 6 is a section on the line A-A of Figure 4,
  • Figure 7 is detail B from Figure 6,
  • Figure 8 is a side elevation of a body in a first stage of manufacture of a gadget
  • Figure 9 is a plan view from above of the body of Figure 8,
  • Figure 10 is a section on the line A-A of Figure 9,
  • Figure 1 1 is a similar view to Figure 1 but showing a second stage m the manufacture
  • Figure 12 is a plan view from above of the overmoulded body of Figure 1 1 ,
  • Figure 13 is a section on the line A-A of Figure 12 and
  • Figure 14 is detail B from Figure 13
  • the knife comprises a blade 10 formed integrally with a
  • the tang 1 1 are of conventional design with a sha ⁇ ened edge 13 and a back edge
  • the blade 10 is formed from stainless steel
  • the body 12 is moulded from a suitable thermoplastic mate ⁇ al such as polypropylene
  • the polypropylene may be reinforced by fibres such as glass fibres
  • the fibres may be reinforced by any suitable material.
  • the body 12 is symmet ⁇ cal about a central plane 15 which
  • the body 12 is formed on either side of the plane 15 with respective side surfaces 1 7
  • Each side surface 17 is formed with an irregularly shaped projection 18 that extends
  • the knife shown in Figures 1 to 3 is at first stage of manufacture In a second stage,
  • the knife is placed in a mould (not shown) and a layer of a second thermoplastic
  • thermoplastic mate ⁇ al is moulded over the body 12
  • the second thermoplastic mate ⁇ al is a mate ⁇ al that, on being overmoulded, bonds chemically to the thermoplastic mate ⁇ al
  • the second thermoplastic mate ⁇ al may also be polypropylene.
  • the overmoulded layer 22 covers both side surfaces 17 of the
  • overmoulded layer 22 does not cover the depressions 21 so that these portions of the
  • overmoulded layer 22 is such to form a handle of suitable dimensions to be readily
  • the depressions 21 provide both a decorative feature and zones that increase
  • the plastics mate ⁇ al of the overmoulded layer 22 may be a different colour from the
  • plastics mate ⁇ al of the body 12 so as to provide a further decorative feature.
  • the projections 18 provide a key between the body 12 and the overmoulded layer 22.
  • FIG. 8 to 15 there is shown a handle for a gadget; for example
  • a kitchen gadget such as a peeler or a corer or any other form of kitchen tool.
  • gadget handle is formed from a body 25 moulded from a suitable thermoplastics
  • mate ⁇ al such as polypropylene
  • the polypropylene may be reinforced by fibres such as
  • the fibres may form 30% of the volume of the body 25. As seen in Figures 8, 9 and 10, the body 25 is symmet ⁇ cal about a central plane 26.
  • the body 25 includes a mounting portion 27 at one end, a boss 28 at the end opposite
  • the mounting portion 27 has converging side walls 30
  • central eye 33 that, for example, allows the gadget to be hung on a hook on a rack (not
  • the boss 28 is, as seen in Figure 9, generally D-shaped in plan with a convex
  • the central section 29 is of generally oval cross-section (see Figure 1 1) but with
  • the width of the central section 29 is less than the width of both the mounting portion
  • the central section 29 thus has two generally C-shaped side walls 37 extending
  • each side wall 37 is arranged on a central section of each side wall 37 towards the boss 28.
  • projections are disposed about the intersection of the side walls 37 with a plane 39
  • a first group of six projections 38 are to one side of the intersection and
  • the five projections 38b of each group have the length of each projection 29 angled
  • projections 38a are adjacent the boss 28 and are provided with a single part-spherical
  • the body 25 will be moulded around a tang (not
  • the implement extends from
  • the formation of the body 25 is the first stage in the manufacture of the handle.
  • the body 25 is placed in a mould (not shown) and a layer of a second
  • thermoplastic material is moulded over the body 25.
  • the second thermoplastic material is moulded over the body 25.
  • material is a material that, on being overmoulded, bonds chemically to the
  • thermoplastic material of the body 25 The second thermoplastic material may also be any thermoplastic material.
  • the overmoulded layer 45 covers both
  • the shape of the overmoulded layer 45 is such as to
  • the plastic material of the overmoulded layer 45 may be a different colour from the
  • plastic material of the body 25 so as to provide a further decorative feature
  • projections 38 provide a key between the body 25 and the overmoulded layer 45 This
  • the implement need not be a knife or a gadget, it could
  • the overmoulded layer 22,45 need not cover
  • thermoplastic material of the body 12,25 The bonding of the thermoplastic material of the body 12,25 to the thermoplastic

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

An implement such as a knife is formed with a handle comprising a body (12; 25) of polypropylene, optionally reinforced with fibres, overmoulded with a layer (22; 45) of a second polypropylene. The body (12; 25) and the overmoulded layer (22; 45) bond together to provide a handle that is dishwasher proof. The body may have exposed portions (18; 38) at the overmoulded layer (22; 45) that provide areas of increased grip.

Description

IMPLEMENTS AND THEIR MANUFACTURE
The invention relates to a method of forming a handle for an implement and to
implements with handles
An implement such as a knife is provided with a handle in the form of a body that can
be gripped It is known to form such a body in one piece, but two piece bodies are
also known It is a problem w ith two-piece bodies that water can sometimes seep
between the parts and this means that the implement can be damaged when used, for
example, in a dishwasher
According to a first aspect of the invention, there is provided a method of forming a
handle for an implement comprising providing on the implement a body of a first
thermoplastic material and then overmoulding the body with a layer of a second
thermoplastic material with the second thermoplastic mateπal bonding to the first
thermoplastic material
The bonding between the body and the layer prevents the ingress of water
According to a second aspect of the invention, there is provided an implement
composing a handle formed by a body of a first thermoplastic mateπal with a layer of a second thermoplastic mateπal overmoulded on at least a part of the body to bond
to the first thermoplastic material.
The following is a more detailed description of some embodiments of the invention,
by way of example, reference being made to the accompanying drawings in which:-
Figure 1 is a side elevation of a knife in a first stage of manufacture having a handle
formed by a body of polypropylene moulded around a tang of the knife,
Figure 2 is a part plan view from above of the body of Figure 1 ,
Figure 3 is a section on a line A-A of Figure 1 ,
Figure 4 is a similar view to Figure 1 but showing the knife in a second stage of
manufacture with an overmoulded layer on the body,
Figure 5 is a plan view from above of a part of the knife of Figure 4,
Figure 6 is a section on the line A-A of Figure 4,
Figure 7 is detail B from Figure 6, Figure 8 is a side elevation of a body in a first stage of manufacture of a gadget
handle, the operative part of the gadget being omitted,
Figure 9 is a plan view from above of the body of Figure 8,
Figure 10 is a section on the line A-A of Figure 9,
Figure 1 1 is a similar view to Figure 1 but showing a second stage m the manufacture
of the handle m which an overmoulded layer is applied to the body,
Figure 12 is a plan view from above of the overmoulded body of Figure 1 1 ,
Figure 13 is a section on the line A-A of Figure 12 and
Figure 14 is detail B from Figure 13
Referring first to Figure 1 , the knife comprises a blade 10 formed integrally with a
tang 1 1 which is surrounded by a body 12 that forms part of a handle The blade 10
and the tang 1 1 are of conventional design with a shaφened edge 13 and a back edge
14 The blade 10 is formed from stainless steel The body 12 is moulded from a suitable thermoplastic mateπal such as polypropylene
The polypropylene may be reinforced by fibres such as glass fibres The fibres may
form 30% of the volume of the body 12
As seen in Figures 2 and 3, the body 12 is symmetπcal about a central plane 15 which
is coplanar with the plane of the blade 10 A πb 16 runs around the intersection of
the plane 15 with the body 12 as best seen in Figures 1 , 2 and 3
The body 12 is formed on either side of the plane 15 with respective side surfaces 1 7
Each side surface 17 is formed with an irregularly shaped projection 18 that extends
generally normal to the associated side surface 17 As seen in Figure 1 , the projection
18 is of generally inverted trapezoidal shape but with side edges formed by linked
arcuate sections one of which is indicated at 19 in Figure 1 Each projection 1 8 has
a surface 20 (see Figures 2 and 3) remote from the associated side surface 17 and
formed with three rows of part spherical depressions 21 These are best seen in
Figures 1 and 3 The rows extend generally parallel to the longer sides of the
associated projection 1 8 and each row is offset relative to the next adjacent row or
rows
The knife shown in Figures 1 to 3 is at first stage of manufacture In a second stage,
the knife is placed in a mould (not shown) and a layer of a second thermoplastic
mateπal is moulded over the body 12 The second thermoplastic mateπal is a mateπal that, on being overmoulded, bonds chemically to the thermoplastic mateπal
of the body 12. The second thermoplastic mateπal may also be polypropylene. As
seen in Figures 4 to 7, the overmoulded layer 22 covers both side surfaces 17 of the
body 12 but does not cover the πb 16. In addition, as seen in Figures 6 and 7, the
overmoulded layer 22 does not cover the depressions 21 so that these portions of the
body 12 are exposed through apertures 23 in the overmoulded layer 22, as best seen
in Figure 7 As seen in Figures 4 to 7, particularly in Figures 4 and 5. the shape of the
overmoulded layer 22 is such to form a handle of suitable dimensions to be readily
gripped The depressions 21 provide both a decorative feature and zones that increase
the grip between a hand and the handle
The plastics mateπal of the overmoulded layer 22 may be a different colour from the
plastics mateπal of the body 12 so as to provide a further decorative feature.
The projections 18 provide a key between the body 12 and the overmoulded layer 22.
This helps retain the overmoulded layer 22 on the body 12
Referring next to Figures 8 to 15, there is shown a handle for a gadget; for example
a kitchen gadget such as a peeler or a corer or any other form of kitchen tool. The
gadget handle is formed from a body 25 moulded from a suitable thermoplastics
mateπal such as polypropylene The polypropylene may be reinforced by fibres such
as glass fibres The fibres may form 30% of the volume of the body 25. As seen in Figures 8, 9 and 10, the body 25 is symmetπcal about a central plane 26.
The body 25 includes a mounting portion 27 at one end, a boss 28 at the end opposite
the mounting portion 27 and a central section 29 extending between the mounting
portion 27 and the boss 28. The mounting portion 27 has converging side walls 30
and converging upper and lower walls 31 that meet at a tip 32 and is provided with a
central eye 33 that, for example, allows the gadget to be hung on a hook on a rack (not
shown) The boss 28 is, as seen in Figure 9, generally D-shaped in plan with a convex
edge 34 as viewed in side elevation in Figure 8 at its junction with the central section
29. The central section 29 is of generally oval cross-section (see Figure 1 1) but with
an upper rib 35 and a lower πb 36 extending between the mounting portion 27 and the
boss 28 and symmetπcally disposed about the central plane 26. As seen in Figure 9,
the width of the central section 29 is less than the width of both the mounting portion
27 and the boss 28.
The central section 29 thus has two generally C-shaped side walls 37 extending
between the upper rib 35 and the lower rib 36 As best seen in Figure 8, each side
wall 37 is provided with 12 projections 38 extending normal to the associated side
wall and arranged on a central section of each side wall 37 towards the boss 28. The
projections are disposed about the intersection of the side walls 37 with a plane 39
(Figure 8) normal to the central plane 26 and extending through the centre line 40 of
the body 25. A first group of six projections 38 are to one side of the intersection and
a second group of six projections 38 to the other One projection 38a of each group of six projections is circular. The remaining five projections 38b of each group are
formed by a pair of circular portions 42 connected by a central narrower portion 43.
The five projections 38b of each group have the length of each projection 29 angled
relative to the intersection, and the projections 38b of one group angled in a direction
opposite to the direction of the projections 38b of the other group. The two circular
projections 38a are adjacent the boss 28 and are provided with a single part-spherical
depression 34 whereas the remaining projections 38b are provided with two part-
spherical projections 44, as seen in Figures 8 and 10.
It will be appreciated that, in use, the body 25 will be moulded around a tang (not
shown) of the implement of which it is to form a handle. The implement extends from
the boss 28.
The formation of the body 25 is the first stage in the manufacture of the handle. In a
second stage, the body 25 is placed in a mould (not shown) and a layer of a second
thermoplastic material is moulded over the body 25. The second thermoplastic
material is a material that, on being overmoulded, bonds chemically to the
thermoplastic material of the body 25. The second thermoplastic material may also
be polypropylene. As seen in Figures 1 1 to 15, the overmoulded layer 45 covers both
side walls 37 of the body 25 but does not cover the upper or lower ribs 35,36. In
addition, as seen in Figures 14 and 15, the overmoulded layer 45 does not cover the
depressions 44 so that these portions of the body 25 are exposed through apertures 46 in the overmoulded layer 45 as best seen in Figure 14 As seen in Figures 8 to 14,
particularly in Figures 8 and 9, the shape of the overmoulded layer 45 is such as to
form a handle of suitable dimensions to be readily gπpped The depressions 44
provide both a decorative feature and zones that increase the grip between a hand and
the handle
The plastic material of the overmoulded layer 45 may be a different colour from the
plastic material of the body 25 so as to provide a further decorative feature The
projections 38 provide a key between the body 25 and the overmoulded layer 45 This
helps to retain the overmoulded layer 45 on the body 25
It will be appreciated that there are a number of variations that can be made to the
arrangement descπbed above The implement need not be a knife or a gadget, it could
be any form of implement such as scissors, tools, whisks, spoons or any item
including a handle such as a saucepan The overmoulded layer 22,45 need not cover
just portions of the body 12,25, it could cover the whole body 12,25 The projections
18,38 need not be as shown, they could have any suitable shape The gπp need not
be formed by depressions 21 , it could be formed by projections or any other suitable
configuration
The bonding of the thermoplastic material of the body 12,25 to the thermoplastic
mateπal of the overmoulded layer 22,45 ensures that water cannot seep between the body 12;25 and the overmoulded layer 22;45. Thus the implement can be washed in
a dishwasher without damage.

Claims

1. A method of forming a handle for an implement comprising providing on
the implement a body (12;25) of a first thermoplastic material and then overmoulding
the body with a layer (22;45) of a second thermoplastic material with the second
thermoplastic material bonding to the first thermoplastic material.
2. A method according to claim 1 wherein the body (12;25) has an exterior
that includes at least one projection (18;38) providing a key between the body and the
layer (22;45) of overmoulded material.
3. A method according to claim 2 wherein the at least one projection (18;38)
has at least a portion thereof that is exposed through an associated opening (23;46) in
the layer (22;45) of overmoulded material.
4. A method according to claim 2 or claim 3 wherein the body ( 12;25) has a
surface (17;37) covered by the layer (22;45) of overmoulded material, the at least one
projection (18;38) extending generally normal to said surface (17;37).
5. A method according to claim 4 wherein the at least one projection ( 18;38)
has a surface (20) remote from said surface ( 17;37), said surface (20) including at least one depression (21;34,44) exposed through an associated opening (23;36) in the
layer (22;45) of overmoulded material.
6. A method according to claim 5 wherein at least one depression (21 ; 34,44)
is part-spherical.
7. A method according to any one of claims 2 to 7 wherein a plurality of said
depressions (21 ; 34,44) are provided on the projection ( 18;38).
8. A method according to claim 7 wherein the body ( 12;25) is elongate and
symmetrical about a central plane, each side of the body (12;25) being provided with
a surface (17;37) formed with a respective projection ( 18;38) including said
depressions (21 ;34,44).
9. A method according to claim 8 wherein the depressions (21 ;34,44) are
arranged in respective arrays on each said surface, the arrays being identical.
10. A method according to claim 8 wherein the body ( 12;25) includes a rib
( 16;35,36) extending along at least a portion of the intersection of the plane of
symmetry of the body (12;25) with the exterior of the body (12;25), the rib (16;35,36)
being uncovered by the layer (22;45) of overmoulded material.
1 1. A method according to any one of claims 1 to 10 wherein both the body
( 12;25) and the layer (22;45) of overmoulded material are of polypropylene.
12. A method according to claim 1 1 wherein the polypropylene of the body
(12;25) is filled with glass fibres.
13. An implement comprising a handle formed by a body (12;25) of a first
thermoplastic material with a layer (22;45) of a second thermoplastic material
overmoulded on at least a part of the body ( 12;25) and bonded to the first
thermoplastic material.
14. An implement according to claim 13 and including an operative part
(10,1 1), the operative part including a connection portion (1 1) with the body (12;25)
being moulded around the connecting portion (1 1 ).
15. An implement according to claim 14 wherein the body (12;25) is
symmetrical about a central plane with respective side faces ( 17;37) on each side of
the plane, the body (12;25) being formed, on each side face (17;37), with at least one
projection (18;38) which forms a key with the layer (22;45) of overmoulded material.
16. An implement according to claim 15 wherein each projection ( 18;38) has
a surface remote from the body (12;25), a portion of each said surface being exposed
through an associated opening (23;46) in the layer (22;45) of overmoulded material.
17. An implement according to claim 16 wherein each said portion of the
projection ( 18;38) comprises a depression (21 ;34,44).
18. An implement according to claim 17 wherein a plurality of depressions
(21 ;34,44) are arranged in an array on the associated projection ( 18;38).
19. An implement according to claim 18 wherein the arrays of depression
(21 ;34,44) on each side of said central plane are identical.
20. . An implement according to any one of claims 15 to 19 wherein the body
(12;25) includes a rib ( 16;35,36) extending along at least a portion of the intersection
ofthe plane ofsymmetry ofthe body (12;25) with the exterior of the body ( 12;25), the
rib (16;35,36) being uncovered by the overmoulded material.
21. An implement according to any one of claims 13 to 20 wherein both the
body (12;25) and the layer (22;45) of overmoulded material are of polypropylene.
22. An implement according to claim 21 wherein the polypropylene ofthe body
(12;25) is filled with glass fibres.
23. An implement according to any one of claims 13 to 22 wherein the
implement is a knife.
PCT/GB2001/000136 2000-02-17 2001-01-15 Implements and their manufacture WO2001060576A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001228624A AU2001228624A1 (en) 2000-02-17 2001-01-15 Implements and their manufacture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0003746A GB2359268A (en) 2000-02-17 2000-02-17 Knife Handle
GB0003746.5 2000-02-17

Publications (1)

Publication Number Publication Date
WO2001060576A1 true WO2001060576A1 (en) 2001-08-23

Family

ID=9885857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/000136 WO2001060576A1 (en) 2000-02-17 2001-01-15 Implements and their manufacture

Country Status (3)

Country Link
AU (1) AU2001228624A1 (en)
GB (1) GB2359268A (en)
WO (1) WO2001060576A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2393929A (en) * 2002-10-12 2004-04-14 Dimitry Khyzhnyak Knife for self-defence
US8458821B2 (en) 2008-12-11 2013-06-11 Shrike Industries, Inc. Helmet stabilization apparatus
US20120098282A1 (en) * 2009-04-21 2012-04-26 Shrike Industries, Inc. Multi-purpose tool
US8615888B2 (en) * 2009-06-30 2013-12-31 Dexter-Russell, Inc. Impaired grip knife
USD744169S1 (en) 2013-09-05 2015-11-24 SERE Industries Inc. Helmet counterweight shovel head
US10588642B2 (en) * 2014-05-15 2020-03-17 Gauthier Biomedical, Inc. Molding process and products formed thereby

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Publication number Priority date Publication date Assignee Title
US4416166A (en) * 1982-03-30 1983-11-22 Oakley, Inc. Handle grip
JPS61261014A (en) * 1985-05-15 1986-11-19 Yamada Hamono Kk Manufacture of handle of kitchen utensil
FR2635998A1 (en) * 1988-09-05 1990-03-09 Tik Tovarna Igel Kobarid Screwdriver handle protected by a non-removable layer of material
US5261665A (en) * 1992-02-11 1993-11-16 Robert A. Paley, Inc. Golf club grip formed of a plurality of materials and method of manufacture thereof
DE4430738A1 (en) * 1993-11-08 1995-05-11 Kai R & D Center Co Handle for a kitchen tool
EP0901887A1 (en) * 1997-09-15 1999-03-17 Snap-on Technologies, Inc. Tool with dual-material handle

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GB2274615A (en) * 1993-01-29 1994-08-03 Moss Prod Pty Ltd Moulded plastic handle and method of its manufacture
US5390572A (en) * 1993-07-27 1995-02-21 Vermont American Corporation Tool with immproved impact and torque capabilities and having ergonomic handle
US5530989A (en) * 1994-12-20 1996-07-02 The Dow Chemical Company Dual durometer handles
WO1997012732A1 (en) * 1995-10-05 1997-04-10 Kellogg Brush Manufacturing Co. Utensil handle and method of making same
US5781956A (en) * 1996-01-17 1998-07-21 Marshalltown Trowel Company Plastic molded float handle
GB2329354B (en) * 1997-09-19 2002-09-18 Fiskars Uk Ltd An implement with an elongate handle

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Publication number Priority date Publication date Assignee Title
US4416166A (en) * 1982-03-30 1983-11-22 Oakley, Inc. Handle grip
JPS61261014A (en) * 1985-05-15 1986-11-19 Yamada Hamono Kk Manufacture of handle of kitchen utensil
FR2635998A1 (en) * 1988-09-05 1990-03-09 Tik Tovarna Igel Kobarid Screwdriver handle protected by a non-removable layer of material
US5261665A (en) * 1992-02-11 1993-11-16 Robert A. Paley, Inc. Golf club grip formed of a plurality of materials and method of manufacture thereof
DE4430738A1 (en) * 1993-11-08 1995-05-11 Kai R & D Center Co Handle for a kitchen tool
EP0901887A1 (en) * 1997-09-15 1999-03-17 Snap-on Technologies, Inc. Tool with dual-material handle

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Also Published As

Publication number Publication date
GB2359268A (en) 2001-08-22
GB0003746D0 (en) 2000-04-05
AU2001228624A1 (en) 2001-08-27

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