CA1061143A - Keys for drill chucks - Google Patents
Keys for drill chucksInfo
- Publication number
- CA1061143A CA1061143A CA269,696A CA269696A CA1061143A CA 1061143 A CA1061143 A CA 1061143A CA 269696 A CA269696 A CA 269696A CA 1061143 A CA1061143 A CA 1061143A
- Authority
- CA
- Canada
- Prior art keywords
- geared head
- key
- shank
- handle
- head component
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B33/00—Hand tools not covered by any other group in this subclass
- B25B33/005—Chuck keys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Forging (AREA)
- Adornments (AREA)
Abstract
TITLE: "AN IMPROVEMENT IN OR RELATING TO
KEYS FOR DRILL CHUNKS".
ABSTRACT OF THE DISCLOSURE:
A key for a drill chuck, the key including a geared head part connected to a separtately formed handle part of machined, forged, cast or moulded form.
KEYS FOR DRILL CHUNKS".
ABSTRACT OF THE DISCLOSURE:
A key for a drill chuck, the key including a geared head part connected to a separtately formed handle part of machined, forged, cast or moulded form.
Description
The invention relates to keys for drill chucks and has for its object to provide an improvement therein.
According to the invention, there is provided a key for a drill chuck, the key including a geared head component and a handle component the latter being of machined, forged, cast or moulded form. The geared head com-ponent is formed with a shank having an end portion adapted to provide an effective anchor within the handle component. The handle is rotatably mount-ed on the shank and is provided with an overload release mechanism for limit-ing the amount of torque which can be applied to the geared head component.
The overload release mechansim may conveniently be constituted by one or more spring elements housed within the handle and bearing against a flat surface, or respective flat surfaces as the case may be, formed on the shank. Such an overload release mechansim will preferably be such that the maximum applied torque when the chuck is being tightened will be lower than that when the chuck is being slackened. A lugged collar may be provided on the shank for free rotation on the shank and for the attachment of a leash by means of which the key can be permanently connected to a power drill or like tool.
The geared head component may be formed integrally with the pilot portion and with the shank portion. However, on the other hand the geared head component may be formed with a cylindrical bore through which extends a cylindrical portion formed, cast or moulded integrally with the handle, a projecting spigot part of said cylindrical portion forming E~ ~
the pilot portion of the key. Alternatively, the geared head component may be of composite construction, being fo~med of a geared head element and a separate shank, the two having been subsequently joined together, for example by friction welding, by pressing or by the use of a suitable adhesive. Such a geared head element may be formed for example by forging or by the use of sintered metal techniques and may be formed integrally with the pilot portion of the key and with a spigot portion adapted to be received in a socket por-tion of the shank.
In order that the invention may be fully understood and readily carried into effect, the same will now be describedg by way of example only~
with reference to the accompanying drawings, of which:-Figure 1 is a sectional side view of one form of a drill chuck key~
Figure 2 is a plan view thereof, Figures 3 to 7 are views similar to Figure 1 which illustrate pos-sible modifications which will presently be referred to, and ~igures 8 to 28 are further views which will be referred to when describing other forms of chuck keys.
~eferring now to Figures 1 and 2~ the chuck key there illustrated includes a geared head component 10 (which has been formed with an integral pilot portion 12 and shank 14) and a handle component 16. In this particular embodiment the component 10 has been made by forging (but could have been machined from bar) and the handle component has been moulded in a synthetic plastics material around a splined outer end portion 18 of the shank 14. A
small hole 20 has been moulded in the handle for hanging up of the key against loss or for the addition of a loop or for the attachmen-t of a leash (no-t shown) by means of which the chuck key can be permanently connected to a drill the chuck of which i~ is -to operate (or connected to the electric cable of a portable power tool)~
The chuck key just described is of an attractive appearance and it has been found tha-t the shape of its handle is such that it afford3a comfortable grip and facilitates the application of the required tightening ~0 torque to the geared head component~ However, various minor modifications can be made to this form of chuck keyO For example, in Fig. 3 the splined portion 18 of the shank 14 is shown to extend over a longer distance and the handle is shown to be provided with a skirt 22 which e~tends to the geared head. On the other hand, in Fig. 4 the splined portion 18 is shown to-have been formed on the shank 14 adjacent the geared head and the handle component 16 is shown -to have been formed with cavities 24 in its undersideO
It will of course be understood that the chuck keys so far described could all have been made by moulding the handle as a component separate from the geared head component and then joining -the two components together by forcing the shank 14 into the cylindrical cavity moulded in the handle, with or without the use of an adhesive. In fact, the construction of key illustrated in Fig. ~ is especially adapted to this method of mamlfacture since it can be arranged for the plain outer part of the shank to be entered easily into the cylindrical cavity moulded in the handle to act as a guide member before the splined portion 18 is force fitted in said cavityO
Referring now to ~igo 5, in a further modification of the chuck key described with reference to ~i~s 1 and
According to the invention, there is provided a key for a drill chuck, the key including a geared head component and a handle component the latter being of machined, forged, cast or moulded form. The geared head com-ponent is formed with a shank having an end portion adapted to provide an effective anchor within the handle component. The handle is rotatably mount-ed on the shank and is provided with an overload release mechanism for limit-ing the amount of torque which can be applied to the geared head component.
The overload release mechansim may conveniently be constituted by one or more spring elements housed within the handle and bearing against a flat surface, or respective flat surfaces as the case may be, formed on the shank. Such an overload release mechansim will preferably be such that the maximum applied torque when the chuck is being tightened will be lower than that when the chuck is being slackened. A lugged collar may be provided on the shank for free rotation on the shank and for the attachment of a leash by means of which the key can be permanently connected to a power drill or like tool.
The geared head component may be formed integrally with the pilot portion and with the shank portion. However, on the other hand the geared head component may be formed with a cylindrical bore through which extends a cylindrical portion formed, cast or moulded integrally with the handle, a projecting spigot part of said cylindrical portion forming E~ ~
the pilot portion of the key. Alternatively, the geared head component may be of composite construction, being fo~med of a geared head element and a separate shank, the two having been subsequently joined together, for example by friction welding, by pressing or by the use of a suitable adhesive. Such a geared head element may be formed for example by forging or by the use of sintered metal techniques and may be formed integrally with the pilot portion of the key and with a spigot portion adapted to be received in a socket por-tion of the shank.
In order that the invention may be fully understood and readily carried into effect, the same will now be describedg by way of example only~
with reference to the accompanying drawings, of which:-Figure 1 is a sectional side view of one form of a drill chuck key~
Figure 2 is a plan view thereof, Figures 3 to 7 are views similar to Figure 1 which illustrate pos-sible modifications which will presently be referred to, and ~igures 8 to 28 are further views which will be referred to when describing other forms of chuck keys.
~eferring now to Figures 1 and 2~ the chuck key there illustrated includes a geared head component 10 (which has been formed with an integral pilot portion 12 and shank 14) and a handle component 16. In this particular embodiment the component 10 has been made by forging (but could have been machined from bar) and the handle component has been moulded in a synthetic plastics material around a splined outer end portion 18 of the shank 14. A
small hole 20 has been moulded in the handle for hanging up of the key against loss or for the addition of a loop or for the attachmen-t of a leash (no-t shown) by means of which the chuck key can be permanently connected to a drill the chuck of which i~ is -to operate (or connected to the electric cable of a portable power tool)~
The chuck key just described is of an attractive appearance and it has been found tha-t the shape of its handle is such that it afford3a comfortable grip and facilitates the application of the required tightening ~0 torque to the geared head component~ However, various minor modifications can be made to this form of chuck keyO For example, in Fig. 3 the splined portion 18 of the shank 14 is shown to extend over a longer distance and the handle is shown to be provided with a skirt 22 which e~tends to the geared head. On the other hand, in Fig. 4 the splined portion 18 is shown to-have been formed on the shank 14 adjacent the geared head and the handle component 16 is shown -to have been formed with cavities 24 in its undersideO
It will of course be understood that the chuck keys so far described could all have been made by moulding the handle as a component separate from the geared head component and then joining -the two components together by forcing the shank 14 into the cylindrical cavity moulded in the handle, with or without the use of an adhesive. In fact, the construction of key illustrated in Fig. ~ is especially adapted to this method of mamlfacture since it can be arranged for the plain outer part of the shank to be entered easily into the cylindrical cavity moulded in the handle to act as a guide member before the splined portion 18 is force fitted in said cavityO
Referring now to ~igo 5, in a further modification of the chuck key described with reference to ~i~s 1 and
2, the plain portion of the shank 14 between -the geared head and the synthetic plastics handle is shown to be loosely encircled by a lugged collar 26 to which is connect-ed a flexible leash 28 by means of which the key is shown -to be connected to the electric cable of a portable power tool (although of course it could equally well be connected to a part of the power tool or other suitable anchor point instead of to the electric cable). In Fig.
5a the leash illustrated is shown to be provided at each end with a notched head portion 27 which can be inserted through any one of a number of a~jacent slots 29 to form a closed loop (or of course the notched head could be inserted through an eyelet or lug such as that of the collar 26) but it will be understood that any other form of leash may be employed if preferredO ~he collar 26 is of solid form as shown in end view in Figo 6 so that of course it has been requirea to be threaded onto the shank 14 of the geared head component 10 before the latter has been united with the separately moulded handle component 16~ However, in Figo 7 there is shown in end view an alternative collar 26 which is of split form so that it can be sprung over or around the shant~ 14 and of course -this can then be fitted -to a key which has been formed in the manner of the key originally described with reference to Figso 1 and 2 or to a key the geared head and handle components of which have already been united together (Such a collar 26 of split form could loosely surround the skirt portion 22 adjacent to the gcared head in the construction sholm in Figs~ 3 and 4~ In this way the kcy would bc a~b to rotate freely l~ithin the collar, thus preventing the leash becoming tangled as the chuck is tightened or un-tightened by the key).
Referring now to Figure 8~ this illustrates a chuck key very similar to those previously described except that the geared head component 10 has been formed with a shank 14 which terminates in a winged or flatted root por-tion 30. (The handle 16 in this case will have been moulded around the root portion).
Referring now to Figure 9, in another form of chuck key7 the handle component is of winged head form as shown and the shank 14 of the geared head component is shown to terminate in a crimped root portion 32 around which the handle component has been moulded. (However, it will be understood that this winged head form of handle could be fitted to any of the chuck keys previously described in which case the winged head could be of forged, stamped~ cast or sintered metal construction).
In Figures 10, 11, 12 and 13 there is illustrated still a further form of chuck key. In this case it will be seen that the geared head compon-ent constitutes little more than the geared head and is formed with a cylindri-cal bore 34 ~or receiving a spigot portion 36 which has been moulded or cast integrally with the handle 16. ~owever, the geared head is formed with a lipped annular projection 38 which is received in a depression of complemen-tary shape in the handle part and it will be seen in Figure 12 that the gear-ed head is in addition formed with oppositely disposed key pieces 40 which merge with the projection 38 and engage complementary slots in the handle part so that a driving connection is established between the two.
_6-f~
The geared head component in this case may have been formed for example by machining or by ~orging or by sintered metal technology or by moulding o.r castingO ~he geared head component may havc been placed in the mould prior to the moulding or easting of the handle partO On the other hand thc han~le part may have bcen moulded, cast or sin-tered prior to the two parts having been snapped togetherO
Referring now to Figso 14 and 15, the chuek key there illustrated is very similar to that jus-t described : but the geared head component 10 eonstitutes no more than the geared head and the handle part is of a somewhat different shapeO In addition the spigot portion ~6 is stepped down slightly from the cylindrical portion which is a tight fit in the bore 34 of the geared head In Figo 167 which is an exploded view, a chuek key whieh is very similar to that jus-t deseribed has its handle part of a sligh-tly differen-t form and has a geared head eomponent 10 which is exaetly the same exeept for the faet that it has a shallow cross slot 35 for the reccption of eomplementary key pieees 37 formed on the handle partO
~his particular construction lends itself to the idea of supplying one or more replaeement geared head eomponents with a ehuek key of -this ~ind so tha-t when the teeth of the original gcared head component beeome badly worn it ean be removed from thc eylindrical portion of the handle part so that a replacement ean be fitted. ~his operation will of course bc facili-tated if the geared head component is made only a medium tight press fit on the ~0 eylindrieal porticn so that the removal of a worn component is no-t rendered too difficulto On the other hand of course it will bc understood that- other means may be employed for fixing a geared head component on the cylindrical portion of the handle part.
In Fig. 17 there i5 illustrated an alternative form of handle part which oDuld be employed in the chuck key just described.
In Fig. 18 there is illustrated a chuck key having the same external appearance as the key illustrated in Figs. 14 and 15 but it will be seen that the geared head component has been made of a comp~site construction, that is to say it has a metal shank 14 with an integral pilot portion 12 and a geared head 10 having a cylindrical bore, the geared head having been press fitted on said shank. A handle oo~ponent 16 moulded in a synthetic plastics materi-al or fo med by forging, casting or sintering has keen subsequently press fitted on the outer end portion of the shank which in this case has been shown spl med but could be round, square, hexagonal or of mating shape to the bore in the handle.
Referring now to Figs. 19 and 20, there is illustrated a chuck key the external appearance of which is almost exactly the same as that of the key described with reference to Figs. 2 and 3. However, in this case it will be seen that the handle part is hollow and houses within it means, i.e.
an overlo~d release mechanism, for lImiting the amount of torque which can be applied to the geared head component. The handle part itself i5 rotatably mounted on the shank portion of the gear3d head comFonent but is provided with a recess within which a U-shaped element 40 made of flat steel strip is housed. The limbs of the element 40 normally lie against opFositely disposed flat surfaces 42 which are formed on the shank of the geared head camponent so that they can transmit drive thereto. However, the arrangement is such that if an e~cessive torque is applied to the handle part the limbs of the element 40 are deflected, that i5 to say caused to bow outwards away from each other, so that the handle part is able to turn relative to the geared head component. (The handle part is shown in Fig. 19 to be rotating freely on the shank of the geared head component. In Fig. 20 the parts are shown ~3~
in their normal positions, that is to say before an excessive torque has keen applied). The ovexload relea æ mechanism just referred to is enclosed in the hollow interior of the handle by means of a cover piece 44.
In Fig~ 21 there is illustrated a m~dification of the chuck key just described, the modification residing in the fact that the single U-shaped element of the overload release mechani~m has been replaced by a Fair of such elenE~lts placed within oppositely tapering parts of the hollow interior of the handle as shown so that their curved portions normally bear against the flat surfaces 42.
In a different mDdification shown in Fig. 22 the single U-shaped element 40 of the overload release mechanism has been replaced by a pair of substantially L-shaped spring steel elements 46 of slightly crinXled form and placed as shcwn in the oppositely dis~osed tapering parts of the hollow interior of the handle. The shaFe of the elements 46 is such that by trial and exFerImsnt they have keen ~ound to bear with the required torque trans-mitting pressures against the flat surfaces formed on the shank so that the handle can transmit the required maximum tightening torque to a drill chuck for efficient use without da~age to the chuck and key gearing and related component parts. The self-locking action of the spring steel elements 46 when the key handle is reversed ens~res that the chuck grip can be relea~ed kecause the arrangemen~ is such that the applied torque transmitted when the chuck is keing ti~htened is lower than when it is keing slackened.
The various constructions so far described and illustrated (with the exception of tho æ illustrated in Figs. 10 to 18) have been described as having a geared head component formed with an integral pilot portion 12 and shank 14. ~Iowever, the geared head component could ke formed sep æ ately frcm the shank 14 andVor the pilot portion 12 in several ways.
For ex~m~le, Fig. 23 is an ex~loded view of a geared head component of composite construction having a geared head element generally indicated 48 (with an integral pilot portion 12 at one end and with a cylindrical socket portion 50 at the other) which has been made either by forging or by sintered metal technology or by machining or casting, and a separate cylindrical shank 14 with a knurled or splined portion 18 at one end, the shank having been formed from steel rod. The tw~ components mav be joined together with the shank located in the socket portion of the geared head elemPnt, in any of a num~er of ways, for exa~ple by a friction welding technique or by the application of an adhesive such as 'ILoctite'' (Registered Trade Mark). It will be understood that such a co~lposite construction of geared head component may be used in any of the previously describad forms of chuck key (with the excepti~n of those described with refexence to Figs. 10 to 18 of course). It will also be understood that instead of being provided with a splined or knurled portion for the subseguent connection of the handle part the separate shank 14 in Fig. 23 could be for~ed integrally with a handle part as a projecting spigot portion for reception in the soc~et portion 50 of the geared head. Alternatively, instead of being formed with a cylindrical socket portion the gearecl head ele~ent could be formed with a sochet portion of square, hexagonal or any such relatecl form for the xeception of one end of a driving elemant constituted by a short length of square, hexagonal or such related form of bar the other end of which is to be received in a similar socket portion of the handle part. Such a construction is shown in Fig. 24 where a geared head element 48 if formed with a sccket portion 50 of square form, a driving element 56 is constitutecl by a short length of square bar, and a handle part is formed with a socket portion 58 of square ~brm. me component parts will in this case be joined together by the application of a suitable adhesive or by the elements being of a press fit. (Obviously of course any other of the various shapes of handles pre-viously illustrated could have been used in this instance, m~dified b~ the addition of the square shaped socket).
In Fig. 25 there is illustrated another form of composite con-struction of geared head component. In this case the geared head element 48 has been formed wi,th an integral pilot portion 12 and wi~h an integral spigot portion 52. The shank 14, which has aga,in been formed from steel rod, is formed with a socket portion 54 at one end for the reception of the spigot portion 52 and as in the previous example the two components may be joined together in any one of a number of ways~ (Here again it will be understood that the socketed shank part could be formed integrally with the handle part, for example as shown in Figure 26. Alternatively~ the socketed shank part may be a drawn down component as shswn in Figure 27. Such a drawn down form of shank may be used in an integral geared head and shank construction as shown in Figure 28 and arranged to fit many of the handle forms previously described or arranged to form its own integral handle).
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5a the leash illustrated is shown to be provided at each end with a notched head portion 27 which can be inserted through any one of a number of a~jacent slots 29 to form a closed loop (or of course the notched head could be inserted through an eyelet or lug such as that of the collar 26) but it will be understood that any other form of leash may be employed if preferredO ~he collar 26 is of solid form as shown in end view in Figo 6 so that of course it has been requirea to be threaded onto the shank 14 of the geared head component 10 before the latter has been united with the separately moulded handle component 16~ However, in Figo 7 there is shown in end view an alternative collar 26 which is of split form so that it can be sprung over or around the shant~ 14 and of course -this can then be fitted -to a key which has been formed in the manner of the key originally described with reference to Figso 1 and 2 or to a key the geared head and handle components of which have already been united together (Such a collar 26 of split form could loosely surround the skirt portion 22 adjacent to the gcared head in the construction sholm in Figs~ 3 and 4~ In this way the kcy would bc a~b to rotate freely l~ithin the collar, thus preventing the leash becoming tangled as the chuck is tightened or un-tightened by the key).
Referring now to Figure 8~ this illustrates a chuck key very similar to those previously described except that the geared head component 10 has been formed with a shank 14 which terminates in a winged or flatted root por-tion 30. (The handle 16 in this case will have been moulded around the root portion).
Referring now to Figure 9, in another form of chuck key7 the handle component is of winged head form as shown and the shank 14 of the geared head component is shown to terminate in a crimped root portion 32 around which the handle component has been moulded. (However, it will be understood that this winged head form of handle could be fitted to any of the chuck keys previously described in which case the winged head could be of forged, stamped~ cast or sintered metal construction).
In Figures 10, 11, 12 and 13 there is illustrated still a further form of chuck key. In this case it will be seen that the geared head compon-ent constitutes little more than the geared head and is formed with a cylindri-cal bore 34 ~or receiving a spigot portion 36 which has been moulded or cast integrally with the handle 16. ~owever, the geared head is formed with a lipped annular projection 38 which is received in a depression of complemen-tary shape in the handle part and it will be seen in Figure 12 that the gear-ed head is in addition formed with oppositely disposed key pieces 40 which merge with the projection 38 and engage complementary slots in the handle part so that a driving connection is established between the two.
_6-f~
The geared head component in this case may have been formed for example by machining or by ~orging or by sintered metal technology or by moulding o.r castingO ~he geared head component may havc been placed in the mould prior to the moulding or easting of the handle partO On the other hand thc han~le part may have bcen moulded, cast or sin-tered prior to the two parts having been snapped togetherO
Referring now to Figso 14 and 15, the chuek key there illustrated is very similar to that jus-t described : but the geared head component 10 eonstitutes no more than the geared head and the handle part is of a somewhat different shapeO In addition the spigot portion ~6 is stepped down slightly from the cylindrical portion which is a tight fit in the bore 34 of the geared head In Figo 167 which is an exploded view, a chuek key whieh is very similar to that jus-t deseribed has its handle part of a sligh-tly differen-t form and has a geared head eomponent 10 which is exaetly the same exeept for the faet that it has a shallow cross slot 35 for the reccption of eomplementary key pieees 37 formed on the handle partO
~his particular construction lends itself to the idea of supplying one or more replaeement geared head eomponents with a ehuek key of -this ~ind so tha-t when the teeth of the original gcared head component beeome badly worn it ean be removed from thc eylindrical portion of the handle part so that a replacement ean be fitted. ~his operation will of course bc facili-tated if the geared head component is made only a medium tight press fit on the ~0 eylindrieal porticn so that the removal of a worn component is no-t rendered too difficulto On the other hand of course it will bc understood that- other means may be employed for fixing a geared head component on the cylindrical portion of the handle part.
In Fig. 17 there i5 illustrated an alternative form of handle part which oDuld be employed in the chuck key just described.
In Fig. 18 there is illustrated a chuck key having the same external appearance as the key illustrated in Figs. 14 and 15 but it will be seen that the geared head component has been made of a comp~site construction, that is to say it has a metal shank 14 with an integral pilot portion 12 and a geared head 10 having a cylindrical bore, the geared head having been press fitted on said shank. A handle oo~ponent 16 moulded in a synthetic plastics materi-al or fo med by forging, casting or sintering has keen subsequently press fitted on the outer end portion of the shank which in this case has been shown spl med but could be round, square, hexagonal or of mating shape to the bore in the handle.
Referring now to Figs. 19 and 20, there is illustrated a chuck key the external appearance of which is almost exactly the same as that of the key described with reference to Figs. 2 and 3. However, in this case it will be seen that the handle part is hollow and houses within it means, i.e.
an overlo~d release mechanism, for lImiting the amount of torque which can be applied to the geared head component. The handle part itself i5 rotatably mounted on the shank portion of the gear3d head comFonent but is provided with a recess within which a U-shaped element 40 made of flat steel strip is housed. The limbs of the element 40 normally lie against opFositely disposed flat surfaces 42 which are formed on the shank of the geared head camponent so that they can transmit drive thereto. However, the arrangement is such that if an e~cessive torque is applied to the handle part the limbs of the element 40 are deflected, that i5 to say caused to bow outwards away from each other, so that the handle part is able to turn relative to the geared head component. (The handle part is shown in Fig. 19 to be rotating freely on the shank of the geared head component. In Fig. 20 the parts are shown ~3~
in their normal positions, that is to say before an excessive torque has keen applied). The ovexload relea æ mechanism just referred to is enclosed in the hollow interior of the handle by means of a cover piece 44.
In Fig~ 21 there is illustrated a m~dification of the chuck key just described, the modification residing in the fact that the single U-shaped element of the overload release mechani~m has been replaced by a Fair of such elenE~lts placed within oppositely tapering parts of the hollow interior of the handle as shown so that their curved portions normally bear against the flat surfaces 42.
In a different mDdification shown in Fig. 22 the single U-shaped element 40 of the overload release mechanism has been replaced by a pair of substantially L-shaped spring steel elements 46 of slightly crinXled form and placed as shcwn in the oppositely dis~osed tapering parts of the hollow interior of the handle. The shaFe of the elements 46 is such that by trial and exFerImsnt they have keen ~ound to bear with the required torque trans-mitting pressures against the flat surfaces formed on the shank so that the handle can transmit the required maximum tightening torque to a drill chuck for efficient use without da~age to the chuck and key gearing and related component parts. The self-locking action of the spring steel elements 46 when the key handle is reversed ens~res that the chuck grip can be relea~ed kecause the arrangemen~ is such that the applied torque transmitted when the chuck is keing ti~htened is lower than when it is keing slackened.
The various constructions so far described and illustrated (with the exception of tho æ illustrated in Figs. 10 to 18) have been described as having a geared head component formed with an integral pilot portion 12 and shank 14. ~Iowever, the geared head component could ke formed sep æ ately frcm the shank 14 andVor the pilot portion 12 in several ways.
For ex~m~le, Fig. 23 is an ex~loded view of a geared head component of composite construction having a geared head element generally indicated 48 (with an integral pilot portion 12 at one end and with a cylindrical socket portion 50 at the other) which has been made either by forging or by sintered metal technology or by machining or casting, and a separate cylindrical shank 14 with a knurled or splined portion 18 at one end, the shank having been formed from steel rod. The tw~ components mav be joined together with the shank located in the socket portion of the geared head elemPnt, in any of a num~er of ways, for exa~ple by a friction welding technique or by the application of an adhesive such as 'ILoctite'' (Registered Trade Mark). It will be understood that such a co~lposite construction of geared head component may be used in any of the previously describad forms of chuck key (with the excepti~n of those described with refexence to Figs. 10 to 18 of course). It will also be understood that instead of being provided with a splined or knurled portion for the subseguent connection of the handle part the separate shank 14 in Fig. 23 could be for~ed integrally with a handle part as a projecting spigot portion for reception in the soc~et portion 50 of the geared head. Alternatively, instead of being formed with a cylindrical socket portion the gearecl head ele~ent could be formed with a sochet portion of square, hexagonal or any such relatecl form for the xeception of one end of a driving elemant constituted by a short length of square, hexagonal or such related form of bar the other end of which is to be received in a similar socket portion of the handle part. Such a construction is shown in Fig. 24 where a geared head element 48 if formed with a sccket portion 50 of square form, a driving element 56 is constitutecl by a short length of square bar, and a handle part is formed with a socket portion 58 of square ~brm. me component parts will in this case be joined together by the application of a suitable adhesive or by the elements being of a press fit. (Obviously of course any other of the various shapes of handles pre-viously illustrated could have been used in this instance, m~dified b~ the addition of the square shaped socket).
In Fig. 25 there is illustrated another form of composite con-struction of geared head component. In this case the geared head element 48 has been formed wi,th an integral pilot portion 12 and wi~h an integral spigot portion 52. The shank 14, which has aga,in been formed from steel rod, is formed with a socket portion 54 at one end for the reception of the spigot portion 52 and as in the previous example the two components may be joined together in any one of a number of ways~ (Here again it will be understood that the socketed shank part could be formed integrally with the handle part, for example as shown in Figure 26. Alternatively~ the socketed shank part may be a drawn down component as shswn in Figure 27. Such a drawn down form of shank may be used in an integral geared head and shank construction as shown in Figure 28 and arranged to fit many of the handle forms previously described or arranged to form its own integral handle).
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Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A key for a drill chuck, the key including a geared head component and a handle component, the latter being of machined, forged, cast or moulded form, the geared head component being formed with a shank having an end portion adapted to provide an effective anchor within the handle component, the handle being rotatably mounted on the shank and provided with an overload release mechanism for limiting the amount of torque which can be applied to the geared head component.
2. A key as defined in claim 1 wherein the overload release mechanism is constituted by one or more spring elements housed within the handle and bearing against a flat surface formed on the shank.
3. A key according to claim 2, in which the overload release mechanism is such that the maximum applied torque when the chuck is being tightened is lower than that when the chuck is being slackened.
4. A key according to claim 1, in which a lugged collar is provided for free rotation on the shank and for the attachment of a leash by means of which the key can be permanently connected to a tool.
5. A key according to claim 1, in which the geared head component is formed integrally with the pilot portion and with the shank portion.
6. A key according to claim 1, in which the geared head component is formed with a cylindrical bore through which extends a cylindrical portion formed, cast or moulded integrally with the handle, a projecting spigot part of said cylindrical portion forming the pilot portion of the key.
7. A key according to claim 6 in which the geared head component is removably fitted to the cylindrical portion of the handle so that when said geared head component becomes badly worn it can be removed for replacement by a new geared head component.
8. A key according to claim 1, in which the geared head component is of composite construction, being formed of a geared head element and a separate shank, the two having been subsequently joined together, by friction welding, by pressing or by the use of a suitable adhesive.
9. A key according to claim 8, in which the geared head element is formed by forging or by the use of sintered metal techniques and is formed integrally with the pilot portion of the key and with a spigot portion adapted to be received in a socket portion of the shank.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB148476A GB1572601A (en) | 1976-01-14 | 1976-01-14 | Keys for drill chucks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1061143A true CA1061143A (en) | 1979-08-28 |
Family
ID=9722827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA269,696A Expired CA1061143A (en) | 1976-01-14 | 1977-01-13 | Keys for drill chucks |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5940563B2 (en) |
| AU (1) | AU511582B2 (en) |
| CA (1) | CA1061143A (en) |
| DE (1) | DE2700968A1 (en) |
| ES (1) | ES234798Y (en) |
| FR (1) | FR2338111A1 (en) |
| GB (1) | GB1572601A (en) |
| IT (1) | IT1076517B (en) |
| NL (1) | NL7700144A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2055062B (en) * | 1979-07-26 | 1982-12-15 | Roehm Guenter H | Key for a drilling chuck |
| DE3222762C2 (en) * | 1982-06-18 | 1986-04-24 | Torbjörn Götene Olsen | Holder for a chuck key or the like. A machine tool |
| DE202010012954U1 (en) | 2010-11-19 | 2011-02-17 | Albrecht Präzision GmbH & Co. KG | Clamping wrench with torque limiter |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE510264C (en) * | 1928-12-06 | 1930-10-17 | Helmut Roehm | Drill chuck with several axially and radially displaceable clamping jaws |
| US2215621A (en) * | 1939-08-02 | 1940-09-24 | Edwin N Slavik | Safety tool chuck |
| US2551366A (en) * | 1948-04-27 | 1951-05-01 | Dawson Joseph Arthur | Industrial handle for jacob's chuck key |
| US2592094A (en) * | 1950-05-17 | 1952-04-08 | Paul M Willenbring | Chuck key holder for drill motors |
| US2690690A (en) * | 1953-03-26 | 1954-10-05 | Paul I Garton | Self-ejecting chuck wrench |
| GB774381A (en) * | 1953-08-19 | 1957-05-08 | Leslie Kenneth Pearson | Combined chuck key and drift |
| US3457813A (en) * | 1967-08-31 | 1969-07-29 | Walter E Mangas | Spring loaded chuck key |
-
1976
- 1976-01-14 GB GB148476A patent/GB1572601A/en not_active Expired
-
1977
- 1977-01-07 NL NL7700144A patent/NL7700144A/en not_active Application Discontinuation
- 1977-01-11 ES ES1977234798U patent/ES234798Y/en not_active Expired
- 1977-01-12 DE DE19772700968 patent/DE2700968A1/en not_active Ceased
- 1977-01-12 AU AU21247/77A patent/AU511582B2/en not_active Expired
- 1977-01-13 IT IT1926777A patent/IT1076517B/en active
- 1977-01-13 JP JP199077A patent/JPS5940563B2/en not_active Expired
- 1977-01-13 FR FR7700912A patent/FR2338111A1/en active Granted
- 1977-01-13 CA CA269,696A patent/CA1061143A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU2124777A (en) | 1978-07-20 |
| ES234798U (en) | 1978-10-16 |
| GB1572601A (en) | 1980-07-30 |
| NL7700144A (en) | 1977-07-18 |
| FR2338111B1 (en) | 1980-04-11 |
| JPS5940563B2 (en) | 1984-10-01 |
| FR2338111A1 (en) | 1977-08-12 |
| AU511582B2 (en) | 1980-08-28 |
| DE2700968A1 (en) | 1977-07-21 |
| ES234798Y (en) | 1979-02-16 |
| JPS5288876A (en) | 1977-07-25 |
| IT1076517B (en) | 1985-04-27 |
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