GB1574596A – Lathe tool carrier
– Google Patents
GB1574596A – Lathe tool carrier
– Google Patents
Lathe tool carrier
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Info
Publication number
GB1574596A
GB1574596A
GB775276A
GB775276A
GB1574596A
GB 1574596 A
GB1574596 A
GB 1574596A
GB 775276 A
GB775276 A
GB 775276A
GB 775276 A
GB775276 A
GB 775276A
GB 1574596 A
GB1574596 A
GB 1574596A
Authority
GB
United Kingdom
Prior art keywords
holder
tool
recess
projection
workpiece
Prior art date
1977-02-28
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
Application number
GB775276A
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.)
GREY RUSHTON PRECISION TOOLS L
Original Assignee
GREY RUSHTON PRECISION TOOLS L
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.)
1977-02-28
Filing date
1977-02-28
Publication date
1980-09-10
1977-02-28
Application filed by GREY RUSHTON PRECISION TOOLS L
filed
Critical
GREY RUSHTON PRECISION TOOLS L
1977-02-28
Priority to GB775276A
priority
Critical
patent/GB1574596A/en
1980-09-10
Publication of GB1574596A
publication
Critical
patent/GB1574596A/en
Status
Expired
legal-status
Critical
Current
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Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23B—TURNING; BORING
B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
B23B29/04—Tool holders for a single cutting tool
B23B29/12—Special arrangements on tool holders
B23B29/16—Special arrangements on tool holders for supporting the workpiece in a backrest
Description
(54) LATHE TOOL CARRIER (71) We, GEY RUS=ON (PRECISION
TOOLS) LIMITED, a British Company of Clinton Street, Leamington Spa, Warwickshre, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to tool carriers for use in lathes especially those tool carriers knows as roller box tools e.g. for use in capstan or turret lathes. The invention is concerned with such carriers or tods of the kind in which a cutting tool support or holder is movably, e.g. pivotally, mounted on the carrier body for automatic movement to an operative cutting position or to an inoperative position clear of a workpiece for relative withdrawal of the tool and workpiece out of contact with one another so that scoring of the workpiece is avoided on such withdrawal.
The object of the invention is to provide a tool carrier or roller box tool of the kind referred to whereby an improved degree of accuracy is obtained and maintained on repeated operation of the carrier or tool.
Practical advantages in this respect will be apparent from the following disclosure.
According to the invention a tool carrier such as a roller box tool of the kind referred to is characterised by the movably mounted cutting tool holder having in operative co-operation with the carrier a projection and recess positive locating arrangement whereby when the holder is in the operative cutting position it is positively located against radial and axial movement in relation to the carrier.
In practice and as a roller box tool, the construction and arrangement is as follows, reference being had to the accompanying drawings in which: FIGURE 1 is a front elevation of the tool, FIGURE 2 is a side elevation, filGURE 3 is a detail sectional plan view,
and
FIGURES 4 & 5 are front and side elevations respectively showing a modtfca- tion.
Like parts are referred to by the same or similar reference numerals throughout the drawings.
Referring to FIGURES 1 to 3 and in the usual manner of a roller box tol, the tool generally comprises a main body 1 provided with a flange 1:1 for mounting it from the capstan or turret of a lathe, the body also having a head 10 containing an axial aperbure 12 for accommodaxbing a workpiece 2.
The front of the head 10 carries guide or steady rollers 9 for locating peripheral contact with the workpiece 2 and a trns- verse sl;ideway 13 is also formed in the head 10 and which receives a slide 3 for adjustment movement at right angles to the axis of the aperture 12 and workpiece 2.
For adjustment of the slide 3 the latter carries threaded therein a screw 30 having a flange 3:1 which engages a recess 131 in the slideway 13 so that, on turning the screw 30, the slide 3 can be moved towards or away from the workpiece 2 for the purpose of setting the actual cutting tool 4 in relation to the latter. The slide 3 is retained in the slideway 13 by a screw 33 passing through a longitudinal slot therein and threaded in the slide 3.
The cutting tool 4 is shown consisting of the usual kind of tipped lathe tool which is clamped in a tool holder 5 so that the cutting edge tip 40 is presented substantially squarely to the workpiece 2 or at some inclination thereto.
The slide 3 caries the support or holder 5 for the actual cutting tool 4, the holder 5 being pivotally mounted at 50 on the slide 3 about an axis parallel with the axis of the workpiece 2 so that the holder 5 can have limited rocking movement between an operative cutting position of the cutting tool 4 and an inoperative retracted position of the latter. For suitable accuracy the pivotal mounting 50 of the holder 5 on the slide 3 is shown including a hearing assembly 35 of needle rollers in the slide 3 and about a pivot pin 51 extending from the holder 5, the pin 51 being held in place by a screw 53 and end cap 54. However a plain bearing arrangement of the pivot pin 51 may be employed.
The holder 5 is spring urged to the inoperative position by a compression spring 6 accommodated in a recess 56 in the holder 5 and acting against a screw 60 in a flange 32 of the slide 3, the holder 5 being located in the retracted position by means of an adjustable stop screw 7 also carried by the flange 32.
On relative axial feed between a rotating workpiece 2 and the roller box tool and on the cutting tool 4 engaging the workpiece, the holder 5 is rocked to the operative position for obtaining a required depth of cut on the workpiece 2 as the axial feed proceeds.
On completion of the feed movement the spring loading 6 of the holder 5 is such that the latter is turned back to the inoperative position so as to move the edge or tip 40 d the cutting tool 4 clear of the work piece 2 and so enable axial withdrawal of the workpiece and tool to be effected without undesired scoring of the workpiece 2 by the cutting tool 4.
In the operative position of the holder 5 and in accordance with one embodiment of this invention, it is located by a head 80 of a stop screw 8 provided in a lower flange 34 of the slide 3, which screw 8 not only limits the required extent of the rocking movement of the holder 5 into the operative position but by the conical form of the screw head 80 engaging a corresponding recess 58 in the underside of the holder 5.
positively locates the latter against radial or axial movement. This ensures that the holder 5 is positively and accurately located each time it moves into the operative position so that accuracy of engagement of the tool 4 with the workpiece 2 can be maintained on repeated operation i.e. accurate repentability can be obtained.
Whereas conical formation of the screw head 80 and recess 58 is effective in practice and can be readily and accurately produced, other suitable formation may be employed such as a part spherical head engaging a spherical recess in the holder 5. Alternalively a conical, part conical or part spherical projection on the holder 5 may engage a recess in the flange 34 or other suitable part of the slide 3. More than one such arrangement for positive projection and recess locating engagement may be pro vided in spaced apart relationship between the holder 5 and flange 34.
Referring to FIGURES 4 and 5, a modification is shown in which positive location of the tool holder 5 is obtained by a pin 90 or preferably by a pair of spaced apart parallel pins 90, 91 which are also parallel with the axis of the pivotal mounting 50 of the holder 5 and with that of the workpiece aperture 12.
Each pin 90, 91 is a press fit in a correspending longitudinal recess 39 in the lower flange 34 of the head 10 and in a corresponding bore 390 in the latter. The pins 90, 291 are locatingly engaged by a complemen- tary recess 590, 591 of part circular cross section in the underside of the holder 5.
Whereas a single pin 90 may very largely provide adequate location of the holder 5 and tool 4 in the cutting position and to a sufficient degree d accuracy, it is found that the provision of a further pin at 91 ensures a high degree of precision in the location of the holder 5 and tool 4 for accurate repeatibllity. It also avoids or greatly minimizes vibration or chatter of the tool 4 during cutting. The arrangement also has the advantage that it can be more readily manufactured i.e. during the production of the complete tool.
WHAT WE CLAIIM I5:- 1. A tool carrier such as a roller box tool of the kind referred to characterised by the movably mounted cutting tool holder having in operative co-operation with the carrier a projection and recess positive locat ing arrangement whereby when the holder is in the operative cutting position it is positively located against radial and axial move ment in relation to the carrier.
2. A tool carrier according to claim 1 wherein the projection and recess locating arrangement is of corresponding conical or part spherical form.
3. A tool carrier according to claim 1 or 2 wherein a headed stop screw carried by that part of the carrier carrying the cutting tool holder, is adapted to have a positive locating engagement with a recess of corresponding form in said movably mounted tool holder.
4. A tool carrier according to claim 1 wherein the projection and recess locating arrangement is of part cylindrical form.
5. A tool carrier according to claim 4 wherein the projection and recess locating arrangement of part cylindrical form is parallel with pivotal mounting of the movably mounted cutting tool holder.
6. A tool carrier according to claim 4 or 5 wherein at least one cylindrical member or pin is carried by that part of the carrier carrying the cutting tool holder and is adapted to have a positive locating en gage- ment with a longitudinal recess of comple mentary part cylindrical cross section in said movably mounted tool holder.
7. A tool carrier according to any of the preceding claims wherein a further positive projection and recess locating arrangement is provided between the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
**WARNING** start of CLMS field may overlap end of DESC **. pivot pin 51 extending from the holder 5, the pin 51 being held in place by a screw 53 and end cap 54. However a plain bearing arrangement of the pivot pin 51 may be employed. The holder 5 is spring urged to the inoperative position by a compression spring 6 accommodated in a recess 56 in the holder 5 and acting against a screw 60 in a flange 32 of the slide 3, the holder 5 being located in the retracted position by means of an adjustable stop screw 7 also carried by the flange 32. On relative axial feed between a rotating workpiece 2 and the roller box tool and on the cutting tool 4 engaging the workpiece, the holder 5 is rocked to the operative position for obtaining a required depth of cut on the workpiece 2 as the axial feed proceeds. On completion of the feed movement the spring loading 6 of the holder 5 is such that the latter is turned back to the inoperative position so as to move the edge or tip 40 d the cutting tool 4 clear of the work piece 2 and so enable axial withdrawal of the workpiece and tool to be effected without undesired scoring of the workpiece 2 by the cutting tool 4. In the operative position of the holder 5 and in accordance with one embodiment of this invention, it is located by a head 80 of a stop screw 8 provided in a lower flange 34 of the slide 3, which screw 8 not only limits the required extent of the rocking movement of the holder 5 into the operative position but by the conical form of the screw head 80 engaging a corresponding recess 58 in the underside of the holder 5. positively locates the latter against radial or axial movement. This ensures that the holder 5 is positively and accurately located each time it moves into the operative position so that accuracy of engagement of the tool 4 with the workpiece 2 can be maintained on repeated operation i.e. accurate repentability can be obtained. Whereas conical formation of the screw head 80 and recess 58 is effective in practice and can be readily and accurately produced, other suitable formation may be employed such as a part spherical head engaging a spherical recess in the holder 5. Alternalively a conical, part conical or part spherical projection on the holder 5 may engage a recess in the flange 34 or other suitable part of the slide 3. More than one such arrangement for positive projection and recess locating engagement may be pro vided in spaced apart relationship between the holder 5 and flange 34. Referring to FIGURES 4 and 5, a modification is shown in which positive location of the tool holder 5 is obtained by a pin 90 or preferably by a pair of spaced apart parallel pins 90, 91 which are also parallel with the axis of the pivotal mounting 50 of the holder 5 and with that of the workpiece aperture 12. Each pin 90, 91 is a press fit in a correspending longitudinal recess 39 in the lower flange 34 of the head 10 and in a corresponding bore 390 in the latter. The pins 90, 291 are locatingly engaged by a complemen- tary recess 590, 591 of part circular cross section in the underside of the holder 5. Whereas a single pin 90 may very largely provide adequate location of the holder 5 and tool 4 in the cutting position and to a sufficient degree d accuracy, it is found that the provision of a further pin at 91 ensures a high degree of precision in the location of the holder 5 and tool 4 for accurate repeatibllity. It also avoids or greatly minimizes vibration or chatter of the tool 4 during cutting. The arrangement also has the advantage that it can be more readily manufactured i.e. during the production of the complete tool. WHAT WE CLAIIM I5:-
1. A tool carrier such as a roller box tool of the kind referred to characterised by the movably mounted cutting tool holder having in operative co-operation with the carrier a projection and recess positive locat ing arrangement whereby when the holder is in the operative cutting position it is positively located against radial and axial move ment in relation to the carrier.
2. A tool carrier according to claim 1 wherein the projection and recess locating arrangement is of corresponding conical or part spherical form.
3. A tool carrier according to claim 1 or 2 wherein a headed stop screw carried by that part of the carrier carrying the cutting tool holder, is adapted to have a positive locating engagement with a recess of corresponding form in said movably mounted tool holder.
4. A tool carrier according to claim 1 wherein the projection and recess locating arrangement is of part cylindrical form.
5. A tool carrier according to claim 4 wherein the projection and recess locating arrangement of part cylindrical form is parallel with pivotal mounting of the movably mounted cutting tool holder.
6. A tool carrier according to claim 4 or 5 wherein at least one cylindrical member or pin is carried by that part of the carrier carrying the cutting tool holder and is adapted to have a positive locating en gage- ment with a longitudinal recess of comple mentary part cylindrical cross section in said movably mounted tool holder.
7. A tool carrier according to any of the preceding claims wherein a further positive projection and recess locating arrangement is provided between the
movably mounted cutting tool holder and that part of the carrier carrying it and in spaced apart relationship from the first mentioned positive projection and recess locating arrangement.
8. A tool carrier such as a roller box tool of the kind referred to wherein projection and recess positive locating arrangement of the movably mounted cutting tool holder with that part of the carrier or carrying it, is substantially as herein described with reference to FIGURE 1 and 2 or to FIGURES 4 and 5 of the accompanying drawings.
GB775276A
1977-02-28
1977-02-28
Lathe tool carrier
Expired
GB1574596A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB775276A
GB1574596A
(en)
1977-02-28
1977-02-28
Lathe tool carrier
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB775276A
GB1574596A
(en)
1977-02-28
1977-02-28
Lathe tool carrier
Publications (1)
Publication Number
Publication Date
GB1574596A
true
GB1574596A
(en)
1980-09-10
Family
ID=9839040
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB775276A
Expired
GB1574596A
(en)
1977-02-28
1977-02-28
Lathe tool carrier
Country Status (1)
Country
Link
GB
(1)
GB1574596A
(en)
1977
1977-02-28
GB
GB775276A
patent/GB1574596A/en
not_active
Expired
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Legal Events
Date
Code
Title
Description
1981-02-04
PS
Patent sealed
1991-10-23
PCNP
Patent ceased through non-payment of renewal fee
