GB2542615A - An insulated digging tool and a method or manufacture of an insulated digging tool - Google Patents

An insulated digging tool and a method or manufacture of an insulated digging tool Download PDF

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Publication number
GB2542615A
GB2542615A GB1517044.2A GB201517044A GB2542615A GB 2542615 A GB2542615 A GB 2542615A GB 201517044 A GB201517044 A GB 201517044A GB 2542615 A GB2542615 A GB 2542615A
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GB
United Kingdom
Prior art keywords
socket
shaft
overmould
flow channel
extending
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.)
Granted
Application number
GB1517044.2A
Other versions
GB201517044D0 (en
GB2542615B (en
Inventor
Green William
Carter Richard
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.)
Richard Carter Ltd
Original Assignee
Richard Carter Ltd
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 Richard Carter Ltd filed Critical Richard Carter Ltd
Priority to GB1517044.2A priority Critical patent/GB2542615B/en
Publication of GB201517044D0 publication Critical patent/GB201517044D0/en
Publication of GB2542615A publication Critical patent/GB2542615A/en
Application granted granted Critical
Publication of GB2542615B publication Critical patent/GB2542615B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B1/00—Hand tools
    • A01B1/02—Spades; Shovels
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B1/00—Hand tools
    • A01B1/22—Attaching the blades or the like to handles; Interchangeable or adjustable blades
    • 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
    • B25G1/12—Handle constructions characterised by material or shape electrically insulating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G3/00—Attaching handles to the implements
    • B25G3/02—Socket, tang, or like fixings
    • B25G3/04—Socket, tang, or like fixings with detachable or separate socket pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G3/00—Attaching handles to the implements
    • B25G3/34—Attaching handles to the implements by pressing the handle on the implements; using cement or molten metal, e.g. casting, moulding, by welding or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

An insulated digging tool, such as a shovel, with a metal head comprising a digging portion and a socket extending from the digging portion to a socket mouth. An electrically insulating shaft 13 extends from a tip end 14 to a handle end 15, the tip end being received within the socket. The shaft has at least one flow channel 16 in its outer surface extending from inside the socket to outside the socket towards the handle end. An overmould collar extends around the outside of the socket remote from the socket mouth and an electrically insulating overmould extends around the socket and shaft. The overmould extends from the overmould collar, over the outside of the collar and the shaft towards the handle end sufficiently far to cover the at least one flow channel. The overmould further extends into the flow channel and into the socket such that it fills the socket. Also disclosed is a method of manufacturing said digging tool which involves injecting an electrically insulating material along the flow channels so that the socket is filled.

Description

An insulated digging tool and a method of manufacture of an insulated digging tool
The present invention relates to an insulated digging tool. More particularly, but not exclusively, the present invention relates to an insulated digging tool comprising a metal head and an electrically insulating shaft inserted into a socket of the head, the shaft having at least one flow channel in its outer surface extending from outside the socket into the socket, and an overmould which extends over the outside of the socket and along the flow channel into the socket, filling the socket. The present invention also relates to a method of manufacture of an insulated digging tool. More particularly, but not exclusively the present invention relates to a method of manufacture of an insulated digging tool comprising the steps of inserting an electrically insulating shaft into the socket of a metal head, the shaft having at least one flow channel that extends from outside the socket into the socket, arranging a mould around the joint between shaft and head and then injecting an electrically insulating material into the mould so that it flows over the outside of the socket and along the flow channel into the inside of the socket so filling the socket, the material then setting to form an overmould.
It is often desirable to use insulated digging tools such as shovels or forks. There can often be high voltage cables buried under the ground. If one accidentally touches such a cable with the head of a non-insulated digging tool then the user may receive a significant electric shock.
Insulated digging tools are known. Such tools typically comprise a metal head having a socket. An electrically insulated shaft is inserted into the socket. In order to hold the two parts together a fibreglass collar extends from the shaft over the socket. Such insulated digging tools tend to be structurally weak. Often significant bending forces are applied by the user to the tool during use. These forces cause the fibreglass collar to crack and eventually fail at which point the tool falls into two parts. For professional users of such shovels on building sites and the like there is often a significant turnover of such shovels which can be expensive.
The present invention seeks to overcome the problems of the prior art.
Accordingly, in a first aspect, the present invention provides an insulated digging tool comprising a metal head comprising a digging portion and a socket extending from the digging portion to a socket mouth; an electrically insulating shaft extending from a tip end to a handle end, the tip end being received within the socket; the shaft comprising at least one flow channel in its outer surface extending from inside the socket towards the handle end out of the socket; an overmould collar extending around the outside of the socket remote from the socket mouth; and, an electrically insulating overmould extending around the socket and shaft, the overmould extending from the overmould collar, over the outside of the collar and the shaft towards the handle end sufficiently far to cover the at least one flow channel, the overmould further extending into the flow channel and into the socket filling the socket.
The insulated digging tool according to the invention has a significantly improved resistance to bending deformation compared to know insulated digging tools. The insulated digging tool according to the invention has a reliability comparable to single piece non-insulated digging tools.
Preferably the insulated digging tool further comprises a sealing ring extending around the shaft at a point along the shaft between the flow channel and the tip, the sealing ring abutting the inside of the socket and the overmould extending into the socket as far as the sealing ring.
Preferably the at least one flow channel splits into a plurality of sub channels part way along its length, the sub channels extending into the socket.
Preferably the insulated digging tool further comprises a sleeve extending around the socket and shaft, the sleeve extending from the overmould collar past the socket mouth and over the shaft part way along the length of the flow channel.
Preferably the sleeve covers the point where the flow channel splits into a plurality of sub channels.
Preferably the overmould collar comprises a lip and a skirt which extends from the lip towards the socket mouth, the thickness of the skirt decreasing towards the socket mouth.
Preferably both the shaft and overmould are plastics a plastics material, preferably the same plastics material.
In a further aspect of the invention there is provided a method of manufacture of an insulated digging tool comprising the steps of providing a metal head, the metal head comprising a digging portion and a socket extending from the digging portion to a socket mouth, the socket having an overmould collar extending around the outside of the socket remote from the socket mouth; providing an electrically insulating shaft extending from a tip end to a handle end, the shaft comprising at least one flow channel in its outer surface extending from proximate to the tip end towards the handle end; arranging the tip of the shaft in the socket such that the at least one flow channel extends from inside the socket to outside the socket; attaching a mould around the tool between the overmould collar and a connection point of the shaft to cover the at least one flow channel, the mould being spaced apart from the tool between the conection point and the overmould collar; and, injecting an electrically insulating material into the mould such that the insulating material flows over the outside of the socket as far as the overmould collar and along the flow channel into the socket so filling the socket and then sets to form an overmould.
The method according to the invention results in an insulated digging tool which has a significantly improved resistance to bending deformation compared to know insulated digging tools. The insulated digging tool produced by the method according to the invention has a reliability comparable to single piece non-insulated digging tools.
Preferably the shaft further comprises a sealing ring extending around the shaft at a point along the shaft between the flow channel and the tip, the shaft being inserted into the socket sufficiently far that the sealing ring abuts the inside of the socket.
Preferably the method further comprises the step of arranging a sleeve around the tool before attaching the mould, the sleeve extending from the overmould collar past the socket mouth and over the shaft part way along the length of the flow channel.
The present invention will now be described by way of example only and not in any limitiative sense with reference to the accompanying drawings in which
Figure 1 shows in schematic form the metal head and overmould collar of an insulated digging tool according to the invention;
Figure 2(a) shows the overmould collar of an insulated digging tool according to the invention in cross section;
Figure 2(b) shows the overmould collar of figure 2(a) in perspective view.
Figure 3 shows a shaft of an insulated digging tool according to the invention in perspective view; Figure 4 shows a cross section through the shaft, socket and overmould; and
Figure 5 shows the overmould of an insulated digging tool according to the invention in perspective view covering the shaft and socket.
Shown in figure 1 is a metal head 1 and overmould collar 2 of an insulated digging tool 3 according to the invention. The insulated digging tool 3 of this embodiment is a spade. Other digging tools according to the invention may include forks, shovels or hoes.
The metal head 1 comprises a digging portion 4 which is a substantially flat metal member. Extending from the digging portion 4 is a socket 5 in the form of a metal tube. The metal tube 5 extends integrally from the digging portion 4 and is open at the end remote from the digging portion 4 to form a socket mouth 6. Extending around the outside of the socket 5 is the overmould collar 2. The overmould collar 2 is located part way along the socket 5 remote from the socket mouth 6. The overmould collar 2 is sufficiently far from the socket mouth 6 that a portion of the socket 5 protrudes beyond the overmould collar 2 as shown.
Shown in figure 2(a) is the overmould collar 2 of figure 1 in cross section. The overmould collar 2 comprises a hollow tube 7 of an inner diameter suitable for tightly fitting onto the socket 5. The outer wall 8 of the tube 7 has a thickness which varies along the length of the tube 7. Close to one end of the tube 7 is a thickened portion 9 of the wall 8 which defines a lip 9 extending outwardly substantially normal to the length of the tube 7. On one side of the lip 9 (the side closest to the digging portion) is a thickened portion 10 of the wall 8 onto which a moulding tool locates during manufacture of the digging tool 3 (and which is described in detail below). On the other side of the lip 9 is a skirt 11. The thickness of the skirt 11 decreases in a direction away from the lip 9 (ie towards the socket mouth). The final portion 12 of the skirt 11 remote from the lip 9 is very thin compared to the remainder of the skirt 11 and is of uniform thickness.
Figure 2(b) shows the overmould collar 2 in perspective view. The material of the overmould collar 2 is typically an electrically insulating material and is typically the same material as the shaft.
Shown in figure 3 is a shaft 13 of an insulated digging tool 3 according to the invention in perspective view. The shaft 13 is made from an electrically insulating material. The material is typically a thermoplastic material or thermosetting material. Typical suitable plastics include polypropylene, ABS (Acrylonitrile butadiene styrene) polyester, nylon or various grades of rubber.
The shaft 13 extends along a length axis between a tip end 14 and a handle end 15. A flow channel 16 is formed as a groove in the outer face of the shaft 13. The flow channel 16 extends from an insertion point 17 along the outer face of the shaft 13 in a direction towards the tip 14 to a branch point 18. At the branch point 18 the flow channel 16 extends as a channel 19 circumferentially around the shaft 13. Beyond the branch point 18 the flow channel 16 is spilt into a plurality of sub channels 20 which extend beyond the branch point 18 substantially to the tip 14.
On the handle side of the branch point 18 the shaft 13 is of constant diameter. On the tip side of the branch point 18 the shaft 13 is slightly frustoconical having a diameter which decreases towards the tip 14. There is a step change in the diameter of the shaft 13 at the branch point 18. The radius of the shaft 13 on the tip side of the branch point 18 is less than the radius on the other side by approximately the thickness of the wall of the socket mouth 6.
Arranged close to the tip 14 of the shaft 13 is a sealing ring 21. The sealing ring 21 extends around the circumference of the shaft 13.
In the first step of a method of manufacture of an insulated digging tool 3 according to the invention a metal head 1 is provided having an overmould collar 2 arranged on its socket 5 as shown in figure 1. The tip 14 of the shaft 13 is then inserted into the socket mouth 6 and the shaft 13 pushed into the socket 5 until the frustoconical portion of the shaft 13 abuts the inside of the socket 5. The shaft 13 is then urged more firmly into the socket 5, typically with mechanical assistance such that the shaft 13 is firmly gripped by the socket 5. The socket 5 and the frustoconical portion of the shaft 13 are typically dimensioned such that at this point the socket mouth 6 is proximate to the branch point 18 on the shaft 13. As there is a step change in the diameter of the shaft 13 at this point as one moves from the socket 5 to the shaft 13 the transition is smooth.
In the next step a sleeve 22 is arranged tightly around the socket 5 and shaft 13. The sleeve 22 is typically a glass filled nylon sleeve. The sleeve 22 extends from the overmould collar 2 along the socket 5 to the shaft 13 then along the shaft 13 to just before the insertion point 17 so leaving the tip of the flow channel 16 uncovered. At the overmould collar end the sleeve 22 covers the thinnest portion 12 of the skirt 11. The thickness of the sleeve 22 is such that the outer face of the sleeve 22 extends smoothly onto the outer surface of the remainder of the skirt 11.
In the next step a mould (not shown) is arranged around the shaft and socket. The mould extends between the overmould collar 2 and a connection point 23 of the shaft 13. The connection point 23 is arranged between the insertion point 17 and the handle end 15 of the shaft 13 so that the mould covers the flow channel 16. At the overmould collar end the mould is arranged on the portion 10 of the collar 2 on the metal head side of the lip 9. The mould is spaced apart from the shaft 13 and socket 5 between its two ends.
An electrically insulating material is then heated until it is in the fluid state. The fluid material is then injected into the mould. A first portion of the fluid flows over the outside of the shaft 13 then over the outside of the socket 5 until it reaches the overmould collar 2 where it stops, cools and sets. Simultaneously a second portion of the fluid enters the flow channel 16 at the insertion point 17. It then flows along the flow channel 16 under the sleeve 22 until it reaches the branch point 18. At the branch point 18 the fluid flows around the circumferential groove 19 then along the sub channels 20 into the socket 5 where it fills the socket 5, cools and sets. The set material forms the overmould 24. Typically the material used to form the overmould 24 is the same material used for the shaft 13. This produces a strong bond between the two.
In a final step the mould is then removed. Figure 4 shows a cross sectional view through a shaft 13, socket 5 and overmould 24 according to the invention at this point of the method. In this particular embodiment the shaft 13 has two flow channels 16 arranged on opposite sides of the shaft 13. The cross section is in a plane through the two flow channels 16. This is shown in perspective view in figure 5.
In the above described embodiment there is one flow channel 16 which splits into a plurality of sub channels 20 at the branching point 18. In an alternative embodiment of the invention the shaft 13 comprises a plurality of flow channels 16 which split into a plurality of sub channels 20 at the branching point 18. Some of the sub channels 20 may be common to more than one flow channel 16. In a further alternative embodiment of the invention the shaft 13 comprises one or more flow channels 16 which do not branch into sub channels 20 but which extend from an insertion point 17 into the socket 5.
In an alternative embodiment of the invention the sealing ring 21 is not required. The fluid sets as it flows into the socket 5 without the need for a sealing ring 21 to prevent the fluid from flowing out of the other end of the socket 5.
In an alternative embodiment of the invention the sleeve 22 is not required. Use of a sleeve 22 is however to be preferred.
In an alternative embodiment of the invention the material injected into the mould is injected under pressure causing it to flow. Once the pressure is released the material sets. In a further embodiment of the invention the material is caused to flow by a mixture of temperature and pressure. In embodiments where the material is heated the temperature and flow rate are preferably arranged such that the material is just on the point of setting when it reaches the overmould collar 2 and fills the socket 5. This reduces the cooling time and so increases the throughput of the apparatus performing the method.

Claims (12)

1. An insulated digging tool comprising a metal head comprising a digging portion and a socket extending from the digging portion to a socket mouth; an electrically insulating shaft extending from a tip end to a handle end, the tip end being received within the socket; the shaft comprising at least one flow channel in its outer surface extending from inside the socket towards the handle end out of the socket; an overmould collar extending around the outside of the socket remote from the socket mouth; and, an electrically insulating overmould extending around the socket and shaft, the overmould extending from the overmould collar, over the outside of the collar and the shaft towards the handle end sufficiently far to cover the at least one flow channel, the overmould further extending into the flow channel and into the socket filling the socket.
2. An insulated digging tool as claimed in claim 1, further comprising a sealing ring extending around the shaft at a point along the shaft between the flow channel and the tip, the sealing ring abutting the inside of the socket and the overmould extending into the socket as far as the sealing ring.
3. An insulated digging tool as claimed in either of claims 1 or 2, wherein the at least one flow channel splits into a plurality of sub channels part way along its length, the sub channels extending into the socket.
4. An insulated digging tool as claimed in any one of claims 1 to 3, further comprising a sleeve extending around the socket and shaft, the sleeve extending from the overmould collar past the socket mouth and over the shaft part way along the length of the flow channel.
5. An insulated digging tool as claimed in claim 4, when dependent on claim 3, wherein the sleeve covers the point where the flow channel splits into a plurality of sub channels.
6. An insulated digging tool as claimed in any one of claims 1 to 5, wherein the overmould collar comprises a lip and a skirt which extends from the lip towards the socket mouth, the thickness of the skirt decreasing towards the socket mouth.
7. An insulated digging tool as claimed in any one of claims 1 to 6, wherein both the shaft and overmould are plastics a plastics material, preferably the same plastics material.
8. A method of manufacture of an insulated digging tool comprising the steps of providing a metal head, the metal head comprising a digging portion and a socket extending from the digging portion to a socket mouth, the socket having an overmould collar extending around the outside of the socket remote from the socket mouth; providing an electrically insulating shaft extending from a tip end to a handle end, the shaft comprising at least one flow channel in its outer surface extending from proximate to the tip end towards the handle end; arranging the tip of the shaft in the socket such that the at least one flow channel extends from inside the socket to outside the socket; attaching a mould around the tool between the overmould collar and a connection point of the shaft to cover the at least one flow channel, the mould being spaced apart from the tool between the conection point and the overmould collar; and, injecting an electrically insulating material into the mould such that the insulating material flows over the outside of the socket as far as the overmould collar and along the flow channel into the socket so filling the socket and then sets to form an overmould.
9. A method of manufacture of a digging tool as claimed in claim 8, wherein the shaft further comprises a sealing ring extending around the shaft at a point along the shaft between the flow channel and the tip, the shaft being inserted into the socket sufficiently far that the sealing ring abuts the inside of the socket.
10. A method of manufacture of a digging tool as claimed in either of claims 8 or 9, further comprising the step of arranging a sleeve around the tool before attaching the mould, the sleeve extending from the overmould collar past the socket mouth and over the shaft part way along the length of the flow channel.
11. An insulated digging tool substantially as hereinbefore described
12. A method of manufacture of a digging tool substantially as hereinbefore described.
GB1517044.2A 2015-09-26 2015-09-26 An insulated digging tool and a method of manufacture of an insulated digging tool Active GB2542615B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1517044.2A GB2542615B (en) 2015-09-26 2015-09-26 An insulated digging tool and a method of manufacture of an insulated digging tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1517044.2A GB2542615B (en) 2015-09-26 2015-09-26 An insulated digging tool and a method of manufacture of an insulated digging tool

Publications (3)

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GB201517044D0 GB201517044D0 (en) 2015-11-11
GB2542615A true GB2542615A (en) 2017-03-29
GB2542615B GB2542615B (en) 2021-02-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3620285A1 (en) * 2018-09-06 2020-03-11 Fiskars Finland Oy Ab A hand tool and a manufacturing method for a hand tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489795A (en) * 1982-05-17 1984-12-25 Leidy Richard F Shock resistant digging iron
US4639029A (en) * 1985-08-09 1987-01-27 Kolonia Robert A Tool handle
US5310230A (en) * 1991-06-10 1994-05-10 Joseph Allen Carmien Closed back shovel and method of assembly
US5477929A (en) * 1993-12-29 1995-12-26 Malco Products, Inc. Garden tool
WO2000016604A1 (en) * 1998-09-18 2000-03-30 Digby Uk Limited Improvements to ground penetrating implements
US20110303055A1 (en) * 2010-06-11 2011-12-15 Miller G Ray Modular long handled tool component system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489795A (en) * 1982-05-17 1984-12-25 Leidy Richard F Shock resistant digging iron
US4639029A (en) * 1985-08-09 1987-01-27 Kolonia Robert A Tool handle
US5310230A (en) * 1991-06-10 1994-05-10 Joseph Allen Carmien Closed back shovel and method of assembly
US5477929A (en) * 1993-12-29 1995-12-26 Malco Products, Inc. Garden tool
WO2000016604A1 (en) * 1998-09-18 2000-03-30 Digby Uk Limited Improvements to ground penetrating implements
US20110303055A1 (en) * 2010-06-11 2011-12-15 Miller G Ray Modular long handled tool component system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Richard Carter 2015 brochure, dated to 13/05/15 via document properties, available at: http://richardcarterltd.co.uk/images/carters/brochure.pdf *
Richard Carter Shocksafe Insulated Tools, dated 22/07/13 via document properties, available at: http://pdfs.findtheneedle.co.uk/26688.pdf *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3620285A1 (en) * 2018-09-06 2020-03-11 Fiskars Finland Oy Ab A hand tool and a manufacturing method for a hand tool

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Publication number Publication date
GB201517044D0 (en) 2015-11-11
GB2542615B (en) 2021-02-24

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