GB2144069A - Hand tool - Google Patents

Hand tool Download PDF

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Publication number
GB2144069A
GB2144069A GB08315994A GB8315994A GB2144069A GB 2144069 A GB2144069 A GB 2144069A GB 08315994 A GB08315994 A GB 08315994A GB 8315994 A GB8315994 A GB 8315994A GB 2144069 A GB2144069 A GB 2144069A
Authority
GB
United Kingdom
Prior art keywords
shaft
head
eye
plastics material
annular space
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Withdrawn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
GB08315994A
Other versions
GB8315994D0 (en
Inventor
Lionel Ralph Fabien
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.)
SUPERSAFE FIBREGLASS TOOL HAND
Original Assignee
SUPERSAFE FIBREGLASS TOOL HAND
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 SUPERSAFE FIBREGLASS TOOL HAND filed Critical SUPERSAFE FIBREGLASS TOOL HAND
Priority to GB08315994A priority Critical patent/GB2144069A/en
Publication of GB8315994D0 publication Critical patent/GB8315994D0/en
Publication of GB2144069A publication Critical patent/GB2144069A/en
Withdrawn legal-status Critical Current

Links

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
    • B29C45/14467—Joining articles or parts of a single article
    • B29C45/14491—Injecting material between coaxial articles, e.g. between a core and an outside sleeve for making a roll
    • 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
    • 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)
  • Manufacturing & Machinery (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A hand tool comprising a head 3 with an eye into which a shaft 4 is inserted, wherein the annular space between the wall of the eye and the part of the shaft 4 in the eye is substantially filled with plastics material 20 which retains the head 3 on the shaft 4. The apparatus for assembling the hammer comprises two jaws 1,2 which are moved towards each other to clamp the head 3 in position while causing a part of the shaft 4, held in the jaw 2 by a lock 6, to enter the eye. Hot fluid thermoplastics (nylon) 20 is then injected into the annular space through a passage 21 in the jaw 1. The fluid is allowed to cool and set. The lock 6 is released and the jaws 1, 2 are separated for removal of the hammer. <IMAGE>

Description

SPECIFICATION Hand tool This invention relates to the assembly of a hand tool comprising a shaft and a head with an eye into which the shaft is inserted. It is particularly applicable to hand-held percussive tools designed to be used with a swinging and striking action, such as workshop-type hammers.
Hammers for industrial use are now commonly provided with shafts of resin-bonded glass fibre (fibreglass) and it is not possible to retain the head on the shaft by expanding the shaft within the eye with wedges as was the case with wooden shafts. Heretofore such glass fibre handles have been retained in the eye by using a jig to hold the shaft and the head in their correct positions with the head downwards, closing off the annular space between the shaft and the wall of the eye at the bottom, pouring a suitable adhesive such as Araldite (RTM) into the annular space and allowing the adhesive to set. Suitable adhesives need careful mixing and take a matter of hours to set which is inconvenient and does not permit rapid production; also problems may be encountered in sealing off the annular space at the bottom in such a way that the adhesive does not leak out.
The present invention provides a hand tool comprising a head with an eye into which a shaft is inserted, wherein the annular space between the wall of the eye and the part of the shaft in the eye is substantially filled with plastics material which retains the head on the shaft. Generally, the plastics material is a thermoplastic material such as nylon, and the plastics material is interlocked mechanically with both the head and the shaft. Hammer heads which are available commercially have eyes with a waist of minimum diameter approximately half way along their length and this provides a suitable interlock with the plastics material. The shaft is preferably provided with one or more through bores which fill with plastics material to complete the interlock but other arrangements such as recesses or circumferential ridges or grooves may be used.To provide additional security, it is desirable that the plastics material is adhered to the wall of the shaft and to the part of the shaft in the eye by means of a heat-activated adhesive.
The invention also extends to apparatus for assembling the tool comprising a pair of jaws for clamping the head therebetween, one of the jaws having a passageway in which the shaft can be held in the correct position relative to the eye, the other of the jaws having passage means for injecting the plastics material into the annular space, and resilient seals carried by the jaws for cooperation with the head and the shaft for closing off the annular space.
An embodiment of the invention will now be described by way of example with reference to the accompanying diagrammatic drawing which shows apparatus for assembling the head and shaft of a hammer.
The apparatus comprises two jaws 1, 2 which can be moved towards each other to clamp a hammer head 3 in position and away from each other to permit removal of the assembled head 3 and shaft 4. The shaft 4 may be retained in a bore 5 in jaw 2 by a collet lock 6 of conventional design.
A resilient ring seal 10 is partly located in a groove in the inner face of jaw 1 and engages the top of the hammer along the periphery of the eye. A similar resilient ring seal 12 on the inner face of jaw 2 has an inwardly directed flange 13 which engages shaft 4. The shaft 3 has two diametrical through-bores 15 and the eye 16 of the head 3 has a waist 17.
In operation, both the wall of the eye 16 and the part 18 of the shaft 45 in the eye 16 are coated with heat-activated adhesive e.g.
by spraying or brushing, and the head 3 and shaft 4 are clamped in position as shown (to avoid the flange 13 wiping the adhesive from the shaft 4, the shaft 4 is clamped in position first). Hot fluid nylon 20 is then injected into the annular space and the bores 15 through a passageway 21 in the jaw 1 and allowed to cool and set, the heat at the same time serving to activate the adhesive. After the nylon has set, (i.e. after a relatively short period), the collet lock 6 is released and the jaws 1, 2 separated to allow the hammer to be removed. Any nylon which has set in passage 21 is trimmed off and the hammer is ready for further manufacturing steps e.g. the provision of a handle as described in our copending patent application 8230529.
In a modification (not shown) holes are drilled through the head 3 at points corresponding to the bores 15 in the shaft 4 before the head 3 is clamped in position. When the head 3 is clamped in position, its outside faces abut resilient seal means (not shown) which effectively close off the outside ends of the holes. Thus, the nylon has a further interlock with the head and forms through-rivets extending completely through the head. Of course the holes in the head need not be aligned with the bores in the shaft but this is preferred.
1. A hand tool comprising a head with an eye into which a shaft is inserted, wherein the annular space between the wall of the eye and the part of the shaft in the eye is substantially filled with palstics material which retains the head on the shaft.
2. A tool according to Claim 1, wherein the plastics material is a thermoplastic material.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Hand tool This invention relates to the assembly of a hand tool comprising a shaft and a head with an eye into which the shaft is inserted. It is particularly applicable to hand-held percussive tools designed to be used with a swinging and striking action, such as workshop-type hammers. Hammers for industrial use are now commonly provided with shafts of resin-bonded glass fibre (fibreglass) and it is not possible to retain the head on the shaft by expanding the shaft within the eye with wedges as was the case with wooden shafts. Heretofore such glass fibre handles have been retained in the eye by using a jig to hold the shaft and the head in their correct positions with the head downwards, closing off the annular space between the shaft and the wall of the eye at the bottom, pouring a suitable adhesive such as Araldite (RTM) into the annular space and allowing the adhesive to set. Suitable adhesives need careful mixing and take a matter of hours to set which is inconvenient and does not permit rapid production; also problems may be encountered in sealing off the annular space at the bottom in such a way that the adhesive does not leak out. The present invention provides a hand tool comprising a head with an eye into which a shaft is inserted, wherein the annular space between the wall of the eye and the part of the shaft in the eye is substantially filled with plastics material which retains the head on the shaft. Generally, the plastics material is a thermoplastic material such as nylon, and the plastics material is interlocked mechanically with both the head and the shaft. Hammer heads which are available commercially have eyes with a waist of minimum diameter approximately half way along their length and this provides a suitable interlock with the plastics material. The shaft is preferably provided with one or more through bores which fill with plastics material to complete the interlock but other arrangements such as recesses or circumferential ridges or grooves may be used.To provide additional security, it is desirable that the plastics material is adhered to the wall of the shaft and to the part of the shaft in the eye by means of a heat-activated adhesive. The invention also extends to apparatus for assembling the tool comprising a pair of jaws for clamping the head therebetween, one of the jaws having a passageway in which the shaft can be held in the correct position relative to the eye, the other of the jaws having passage means for injecting the plastics material into the annular space, and resilient seals carried by the jaws for cooperation with the head and the shaft for closing off the annular space. An embodiment of the invention will now be described by way of example with reference to the accompanying diagrammatic drawing which shows apparatus for assembling the head and shaft of a hammer. The apparatus comprises two jaws 1, 2 which can be moved towards each other to clamp a hammer head 3 in position and away from each other to permit removal of the assembled head 3 and shaft 4. The shaft 4 may be retained in a bore 5 in jaw 2 by a collet lock 6 of conventional design. A resilient ring seal 10 is partly located in a groove in the inner face of jaw 1 and engages the top of the hammer along the periphery of the eye. A similar resilient ring seal 12 on the inner face of jaw 2 has an inwardly directed flange 13 which engages shaft 4. The shaft 3 has two diametrical through-bores 15 and the eye 16 of the head 3 has a waist 17. In operation, both the wall of the eye 16 and the part 18 of the shaft 45 in the eye 16 are coated with heat-activated adhesive e.g. by spraying or brushing, and the head 3 and shaft 4 are clamped in position as shown (to avoid the flange 13 wiping the adhesive from the shaft 4, the shaft 4 is clamped in position first). Hot fluid nylon 20 is then injected into the annular space and the bores 15 through a passageway 21 in the jaw 1 and allowed to cool and set, the heat at the same time serving to activate the adhesive. After the nylon has set, (i.e. after a relatively short period), the collet lock 6 is released and the jaws 1, 2 separated to allow the hammer to be removed. Any nylon which has set in passage 21 is trimmed off and the hammer is ready for further manufacturing steps e.g. the provision of a handle as described in our copending patent application 8230529. In a modification (not shown) holes are drilled through the head 3 at points corresponding to the bores 15 in the shaft 4 before the head 3 is clamped in position. When the head 3 is clamped in position, its outside faces abut resilient seal means (not shown) which effectively close off the outside ends of the holes. Thus, the nylon has a further interlock with the head and forms through-rivets extending completely through the head. Of course the holes in the head need not be aligned with the bores in the shaft but this is preferred. CLAIMS
1. A hand tool comprising a head with an eye into which a shaft is inserted, wherein the annular space between the wall of the eye and the part of the shaft in the eye is substantially filled with palstics material which retains the head on the shaft.
2. A tool according to Claim 1, wherein the plastics material is a thermoplastic material.
3. A tool according to Claim 2, wherein the plastics material is nylon.
4. A tool according to any preceding claim, wherein the plastics material is interlocked mechanically with both the head and the shaft.
5. A tool according to Claim 4, wherein the eye has a waist which interlocks with the plastics material.
6. A tool according to Claim 4 or 5, wherein the shaft has one or more throughholes or recesses with which the plastics material interlocks.
7. A tool according to any preceding claim, wherein the plastics material is adhered to the wall of the shaft and to the part of the shaft in the eye by means of a heat-activated adhesive.
8. A tool according to Claim 7, which has been made by a process wherein the wall of the eye and the said part of the shaft are precoated with heat-activatable adhesive and plastics material is thereafter injected into the annular space.
9. A hand tool substantially as hereinbefore described with reference to the drawing.
10. Apparatus for assembling a tool according to Claim 1, comprising a pair of jaws for clamping the head therebetween, one of the jaws having a passageway in which the shaft can be held in the correct position relative to the eye, the other of the jaws having passage means for injecting the plastics material into the annular space, and resilient seals carried by the jaws for cooperation with the head and the shaft for closing off the annular space.
11. Apparatus according to Claim 10 substantially as hereinbefore described with reference to the drawing.
GB08315994A 1983-06-10 1983-06-10 Hand tool Withdrawn GB2144069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08315994A GB2144069A (en) 1983-06-10 1983-06-10 Hand tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08315994A GB2144069A (en) 1983-06-10 1983-06-10 Hand tool

Publications (2)

Publication Number Publication Date
GB8315994D0 GB8315994D0 (en) 1983-07-13
GB2144069A true GB2144069A (en) 1985-02-27

Family

ID=10544109

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08315994A Withdrawn GB2144069A (en) 1983-06-10 1983-06-10 Hand tool

Country Status (1)

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GB (1) GB2144069A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577458A1 (en) * 1985-02-21 1986-08-22 Maeda Shell Service Co MONOBLOCK MOLDING HAMMER WITH SEPARATE CORES OF HEAD AND HANDLE
EP2380706A1 (en) * 2010-04-24 2011-10-26 Dako Werk Dowidat KG Hammer, in particular sledge hammer, and method of manufacturing such a hammer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB810919A (en) * 1956-09-24 1959-03-25 True Temper Corp Improvements in and relating to hand tools
GB1131430A (en) * 1965-09-21 1968-10-23 Ulysse Matthey Improvements in or relating to hammers
GB1395693A (en) * 1972-11-17 1975-05-29 Stanley Works Hammer
GB1405871A (en) * 1973-03-12 1975-09-10 Stanley Works Handle connection for impact tools
GB1409230A (en) * 1973-09-12 1975-10-08 Stanley Works Hand tool connection and trim collar therefor
WO1982000265A1 (en) * 1980-07-21 1982-02-04 Co Budd Swingable impact tool

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB810919A (en) * 1956-09-24 1959-03-25 True Temper Corp Improvements in and relating to hand tools
GB1131430A (en) * 1965-09-21 1968-10-23 Ulysse Matthey Improvements in or relating to hammers
GB1395693A (en) * 1972-11-17 1975-05-29 Stanley Works Hammer
GB1405871A (en) * 1973-03-12 1975-09-10 Stanley Works Handle connection for impact tools
GB1409230A (en) * 1973-09-12 1975-10-08 Stanley Works Hand tool connection and trim collar therefor
WO1982000265A1 (en) * 1980-07-21 1982-02-04 Co Budd Swingable impact tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577458A1 (en) * 1985-02-21 1986-08-22 Maeda Shell Service Co MONOBLOCK MOLDING HAMMER WITH SEPARATE CORES OF HEAD AND HANDLE
EP2380706A1 (en) * 2010-04-24 2011-10-26 Dako Werk Dowidat KG Hammer, in particular sledge hammer, and method of manufacturing such a hammer

Also Published As

Publication number Publication date
GB8315994D0 (en) 1983-07-13

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Legal Events

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