GB2272857A - Flash-free tool handle moulding - Google Patents

Flash-free tool handle moulding Download PDF

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Publication number
GB2272857A
GB2272857A GB9324043A GB9324043A GB2272857A GB 2272857 A GB2272857 A GB 2272857A GB 9324043 A GB9324043 A GB 9324043A GB 9324043 A GB9324043 A GB 9324043A GB 2272857 A GB2272857 A GB 2272857A
Authority
GB
United Kingdom
Prior art keywords
tool
moulding
handle
synthetic plastics
place
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.)
Withdrawn
Application number
GB9324043A
Other versions
GB9324043D0 (en
Inventor
Geoffrey Betts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB9324043D0 publication Critical patent/GB9324043D0/en
Publication of GB2272857A publication Critical patent/GB2272857A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14418—Sealing means between mould and article
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
    • B29C33/0044—Moulds or cores; Details thereof or accessories therefor with sealing means or the like for sealing off parts of inserts projecting into the mould cavity
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • B29C70/76—Moulding on edges or extremities of the preformed part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/28—Tools, e.g. cutlery
    • B29L2031/283—Hand tools

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Abstract

A method of moulding a synthetic plastics handle in place on a hand tool includes the step of fitting a resilient sealing member (19) on a root end portion (16) of said tool before said root end portion has been located between the two halves (10 and 12) of the moulding die such that on closure of the moulding die a fluid tight seal is formed between the die halves and the sealing member. <IMAGE>

Description

Tool handle moulding The invention relates to the moulding of synthetic plastics handles on hand tools such as screwdrivers and chisels.
It is a particular problem that if the two halves of a moulding die are not brought fully together during the moulding of a handle on a tool such as a screwdriver or chisel, perhaps due to the bolster part of the tool blade being slightly oversize, "flash" will be formed on the tool handle, that is to say, an escape of the plastics material in the liquid state will form a thin fringe of plastics material extending along the parting line of the die and spoil the finished product.
Such "flash" subsequently needs to be trimmed off in a manual operation. This is expensive and the surface finish of the handle will inevitably be impaired. A similar problem exists if the two halves of the moulding die are brought fully together but fail to seal around the bolster of the blade of the tool concerned due to said bolster being slightly undersize. In this case, the "flash" takes place along the cylindrical surface of the bolster and is again troublesome and expensive to remove.
According to one aspect of the invention, there is provided a method of moulding a synthetic plastics handle in place on a hand tool comprising an operative member projecting from said handle, the method including fitting a resilient sealing member on a portion of said member to be disposed at the junction with the handle, and locating said root end portion between the two halves of a moulding die in such a way that the closure of the die forms a fluid tight seal around the sealing member. It is then possible to ensure that there is no other contact between the operative member and the interior of the die that might obstruct the full closure of the die.
The method may include the preliminary step of providing a circumferential recess in said junction portion with which the sealing member can register to retain it in its required position. The circumferential groove may be provided by securing a pre-formed sleeve element having such a groove on a length of rod which is to form the operative member of the tool, such as a blade. Said sleeve element may be secured non-rotatably on said length of rod by forcing of said sleeve element partly onto an integral key portion of said length of rod. The key portion may be formed on said length of rod.by flattening and thereby spreading a tail end portion of the length of rod.
According to another aspect of the invention, there is provided a tool with a synthetic plastics handle moulded on a root end portion of an operative member of said tool, there being an external resilient member surrounding a junction region between said handle and said member. The tool may be provided with a bolster between the handle and operative member, and said bolster may be of non-circular cross section. A sleeve element secured non-rotatably on the operating member may comprise the bolster. The sleeve element may be secured on the member by being forced onto an integral key portion of said member, said key portion having been formed, for example, by flattening and spreading a tail end portion of said member.
One specific embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 is a part-sectional view of a moulding die during the moulding of a tool handle by a method embodying the invention, Figure 2 is a view illustrating the preparation of a root end portion of a tool blade prior to the moulding of a plastics handle thereon by the inventive method, and Figure 3 is a sectional view on the line 3-3 in Figure 2.
Referring now to Figure 1 of the drawings, the moulding die there illustrated forms part of a moulding machine and has die halves 10 and 12 which are brought together on opposite sides of a tool blade, in this case a screwdriver blade, to form a mould cavity 14. A root end 16 of the tool blade extends into the mould cavity for the synthetic plastics material injected therein to form a handle around said root end.
In Figure 2 there is illustrated the preparation of the root end of the tool blade prior to its location in the moulding machine, the preparation comprising the fitment of a resilient sealing washer 18 on a pre-formed sleeve element generally indicated 19 and the securing of said sleeve element on a length of steel rod 21 which is to form the tool blade.In being fitted onto the root end of the tool blade, the plastics sealing washer is forced along a cylindrical portion 20 of said sleeve element, on which it is an interference fit, until it abuts against a bolster 22,the bolster in this case being of hexagonal cross-section. (As it is brought into abutment with the bolster, the sealing washer surrounds a circumferential groove 24 between the portion 20 and bolster; a leading end portion of the sealing washer is able to register in said groove to retain said washer in abutment with the bolster during a subsequent operation of mounting the tool blade in position between the two halves of the moulding die).
Substantially simultaneously with the fitment of the resilient sealing washer on the pre-formed sleeve element in the manner just described, said sleeve element is secured non-rotatably on the length of steel rod 21 by being forced partly onto an integral key portion 26 at or near the tail end of said length of rod. In this specific example, the key portion 26 has been formed at or near the tail end portion of said length of rod by flattening and thereby spreading said tail end portion in a way which retains the same cross sectional area of material at that point.
Referring once again to Figure 1, it will be seen that when the tool blade has been located in position between the two halves of the moulding die, the die can be closed to form a fluid tight seal around the plastics sealing washer. The two halves of the die do not close upon the surface of the bolster 22, and in fact are spaced from the faces of the hexagonal shape which in this illustrated embodiment forms said bolster. Thus it will be seen that although the root end of the tool blade has not been machined to very close tolerances, that is to say, the bolster has not needed to be machined to very close limits of accuracy, which would be expensive, the presence of the sealing washer on the tool blade as it is entered into the moulding machine ensures that the moulding of the handle thereon will be "flash" free.Because the sealing washer is made of a resilient material, it can be ensured that the closure of the two halves of the moulding die fully into abutment one with the other will bring about some radially inward deformation of said sealing washer sufficient to ensure a fluid tight seal around said washer and along the surfaces of the tool blade root end portion. If the material of which the handle is being moulded is of a contrasting colour to that of the sealing washer, the finished tool will be of a pleasing appearance. The fact that the bolster can be of hexagonal cross section is particularly useful if the tool concerned is a screwdriver because this enables a wrench to be applied to the bolster if the user needs to apply greater torque than can be applied purely by manual gripping of the screwdriver.
When the handle has been moulded, that portion of it which surrounds the part of the pre-formed sleeve element which has previously been forced onto the key portion 26 of the rod is thereby locked permanently thereon.
Various modifications may be made. For example, the sealing washer could be differently shaped to be arranged to deform in some way to ensure a fluid tight seal when acted on by the moulding die halves. The tool blade and root end portion could be machined from solid bar instead of being made as an assembly of steel rod and sleeve element as in the illustrated embodiment.
The method of manufacture may be used for the production of many types of tool other than screwdrivers and chisels, that is to say any kind of tool comprising an operative member on which a synthetic plastics handle is moulded in a moulding die.

Claims (12)

CLAIMS:
1. A method of moulding a synthetic plastics handle in place on a hand tool comprising an operative member projecting from said handle, the method including fitting a resilient sealing member on a portion of said member to be disposed at the junction of the handle, and locating said root end portion between the two halves of a moulding die in such a way that the closure of the die forms a fluid tight seal around the sealing member.
2. A method of moulding a synthetic plastics handle in place on a hand tool, according to claim 1, including the preliminary step of providing a circumferential recess in said junction portion with which the sealing member can register to retain it in its required position.
3. A method of moulding a synthetic plastics handle in place on a hand tool, according to claim 2, in which the circumferential groove is provided by securing a pre-formed sleeve element having such a groove on a length of rod which is to form the operative member of the tool, such as a blade.
4. A method of moulding a synthetic plastics handle in place on a hand tool, according to claim 3, in which said sleeve is secured non-rotatably on said length of rod by forcing of said sleeve-.slement partly onto an integral key portion of said length of rod.
5. A method of moulding a synthetic plastics handle in place on a hand tool, according to claim 4, in which the key portion is formed on said length of rod by flattening and thereby spreading a tail end portion of the length of rod.
6. A tool with a synthetic plastics handle moulded on a root end portion of an operative member of said tool, there being an external resilient member surrounding a junction region between said handle and said member.
7. A tool according to claim 6, provided with a bolster between the handle and operative member.
8. A tool according to claim 7, in which the bolster is of non-circular cross section.
9. A tool according to either one of claims 7 and 8, in which a sleeve element secured non-rotatably on the operating member comprises the bolster.
10. A tool according to claim 9, in which the sleeve element is secured on the member by being forced onto an integral key portion of said member.
11. A tool according to claim 10, in which the key portion has been formed by flattening and spreading a tail end portion of said member.
12. A method of moulding a synthetic plastics handle in place on a hand tool, substantially as hereinbefore described.
GB9324043A 1992-11-25 1993-11-23 Flash-free tool handle moulding Withdrawn GB2272857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB929224703A GB9224703D0 (en) 1992-11-25 1992-11-25 Tool handle moulding

Publications (2)

Publication Number Publication Date
GB9324043D0 GB9324043D0 (en) 1994-01-12
GB2272857A true GB2272857A (en) 1994-06-01

Family

ID=10725667

Family Applications (2)

Application Number Title Priority Date Filing Date
GB929224703A Pending GB9224703D0 (en) 1992-11-25 1992-11-25 Tool handle moulding
GB9324043A Withdrawn GB2272857A (en) 1992-11-25 1993-11-23 Flash-free tool handle moulding

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB929224703A Pending GB9224703D0 (en) 1992-11-25 1992-11-25 Tool handle moulding

Country Status (1)

Country Link
GB (2) GB9224703D0 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1001837C2 (en) * 1995-12-06 1997-06-10 Pacific Basin Technoplating B Method for manufacture of head support
FR2754204A1 (en) * 1996-10-04 1998-04-10 Bost Garnache Ind Tool branch manufacturing procedure, e.g. for one half of pliers
EP1369209A2 (en) * 2002-06-06 2003-12-10 Proxxon S.A. Tool handle
GB2390320A (en) * 2002-07-01 2004-01-07 Record Tools Ltd A chisel with moulded handle and shank moulded onto blade through interference connection
WO2004052628A1 (en) * 2002-12-04 2004-06-24 Dow Global Technologies, Inc. Process for molding on a substrate carrying a sealing ridge
DE102004044614A1 (en) * 2004-09-13 2006-03-30 Hans Huonker Gmbh Process for the production of hybrid components and components produced by this process
DE102004046807A1 (en) * 2004-09-27 2006-04-06 eupec Europäische Gesellschaft für Leistungshalbleiter mbH Plastic component for power semiconductor module, has plastic unit connected with connection straps, pin tiers, curved connection units and bushing, by adhesion or form-closure to form positioning unit, which is partly recoated with plastic
WO2006058515A1 (en) * 2004-11-30 2006-06-08 Webasto Ag Moulded plastic article and a method for the production thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB831819A (en) * 1957-03-27 1960-03-30 S & R J Everett & Co Ltd Improvements relating to hypodermic needles
GB1165971A (en) * 1966-05-27 1969-10-01 Wilkinson Sword Ltd Improvements in or relating to Moulding
GB1336826A (en) * 1971-05-12 1973-11-14 Stanley Works Hand tool handle and method for its manufacture
EP0170886A1 (en) * 1984-07-06 1986-02-12 Böllhoff & Co, GmbH & Co KG Compound element consisting of a plastic supporting element and a screw bolt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB831819A (en) * 1957-03-27 1960-03-30 S & R J Everett & Co Ltd Improvements relating to hypodermic needles
GB1165971A (en) * 1966-05-27 1969-10-01 Wilkinson Sword Ltd Improvements in or relating to Moulding
GB1336826A (en) * 1971-05-12 1973-11-14 Stanley Works Hand tool handle and method for its manufacture
EP0170886A1 (en) * 1984-07-06 1986-02-12 Böllhoff & Co, GmbH & Co KG Compound element consisting of a plastic supporting element and a screw bolt

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1001837C2 (en) * 1995-12-06 1997-06-10 Pacific Basin Technoplating B Method for manufacture of head support
FR2754204A1 (en) * 1996-10-04 1998-04-10 Bost Garnache Ind Tool branch manufacturing procedure, e.g. for one half of pliers
EP1369209A2 (en) * 2002-06-06 2003-12-10 Proxxon S.A. Tool handle
EP1369209A3 (en) * 2002-06-06 2005-06-22 Proxxon S.A. Tool handle
GB2390320A (en) * 2002-07-01 2004-01-07 Record Tools Ltd A chisel with moulded handle and shank moulded onto blade through interference connection
WO2004052628A1 (en) * 2002-12-04 2004-06-24 Dow Global Technologies, Inc. Process for molding on a substrate carrying a sealing ridge
US6905643B2 (en) 2002-12-04 2005-06-14 Dow Global Technologies Inc. Process for molding on a substrate
DE102004044614A1 (en) * 2004-09-13 2006-03-30 Hans Huonker Gmbh Process for the production of hybrid components and components produced by this process
DE102004044614B4 (en) * 2004-09-13 2007-10-25 Hans Huonker Gmbh Process for the production of multi-molded electronic components
DE102004046807A1 (en) * 2004-09-27 2006-04-06 eupec Europäische Gesellschaft für Leistungshalbleiter mbH Plastic component for power semiconductor module, has plastic unit connected with connection straps, pin tiers, curved connection units and bushing, by adhesion or form-closure to form positioning unit, which is partly recoated with plastic
DE102004046807B4 (en) * 2004-09-27 2010-08-12 Infineon Technologies Ag Method for producing a plastic housing part for a power semiconductor module
WO2006058515A1 (en) * 2004-11-30 2006-06-08 Webasto Ag Moulded plastic article and a method for the production thereof

Also Published As

Publication number Publication date
GB9224703D0 (en) 1993-01-13
GB9324043D0 (en) 1994-01-12

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)