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US2693731A - Feeding device for the carriage of lathes and turret lathes - Google Patents

Feeding device for the carriage of lathes and turret lathes Download PDF

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Publication number
US2693731A
US2693731A US227363A US22736351A US2693731A US 2693731 A US2693731 A US 2693731A US 227363 A US227363 A US 227363A US 22736351 A US22736351 A US 22736351A US 2693731 A US2693731 A US 2693731A
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Prior art keywords
lathes
lever
carriage
hand
worm
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Expired - Lifetime
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US227363A
Inventor
Mobius Walter
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DMG Mori AG
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Gildemeister AG
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5152—Plural diverse manufacturing apparatus including means for metal shaping or assembling with turret mechanism
    • Y10T29/5154—Plural diverse manufacturing apparatus including means for metal shaping or assembling with turret mechanism tool turret
    • Y10T29/5163—Rack-and-pinion operated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/304536—Milling including means to infeed work to cutter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2531—Carriage feed
    • Y10T82/2537—Apron mechanism
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2531—Carriage feed
    • Y10T82/2547—Change gears

Definitions

  • a main feature of the invention is the connection of the hand wheel and particularly of the hand levers with a drop Worm which is driven by the shaft of the feeding device instead of the toothed gear used hitherto. That drop worm will be engaged to a worm gear located on the axis of the hand wheel or the hand levers, if that control part is moved in the direction away from the lathe. That arrangement guarantees a throwing into gear of the automatic feed device instantly and without difiiculties. An unintentional engaging of these parts cannot occur because the hand lever must always be moved in the direction away from the lathe, if the automatic feed devices shall be engaged.
  • Another advantage is the possibility to disengage the automatic feed device by an adjustable block on the carriage.
  • Fig. l is a section through the manual engaging device
  • Fig. 2 is a section through the lower part of the device to line EE of Fig. 1;
  • Fig. 3 is a detail
  • Fig. 4 is another section through the manual engaging device.
  • Fig. 5 is a detail.
  • the hollow axis 2 is rotating in the casing 1 and carries on its end directed towards the lathe a pinion 4 which engages the gear rack of the carriage (not shown in the drawings).
  • a hub 5 is located on the other end of the axis which carries inside the casing a worm gear 3.
  • the driving shaft 7 for the automatic feed device is rotating in bearings on the casing 1 below the hollow axis 2.
  • a drop worm 9 is driven by the shaft '7 by means of pinions 8.
  • the axis 10 of the drop worm 9 is located in arms 11 which are swinging around the shaft 7 to throw the drop worm in and out of gear with the worm gear 3.
  • the up or down movement of the drop worm 9 is exerted by the moving of the hand levers 6.
  • These levers are located in the hub 5 and they form together the hand wheel which is used for the hand feeding mechanism.
  • the hand levers 6 are fixed in holders 12 which are turnable around the bolts 13 located with their axis transverse to axis 2. Therefore the holders can be moved in planes parallel and radial to the axis 2.
  • the hand levers 6 have on their inner ends thumbs 14 which engage into the annular groove 15 of a disc 16, fixed on the end of a sliding bar 17 located in the hollow axis 2.
  • a disc ring 19 is sliding on the axis 2 under the influence of a pressure spring 18; the hub 19 of the disc ring 19 carries a Wedge 21 which is movable in the longitudinal 6 Claims.
  • One of the arms 11 is provided with a thumb 22 laying against the disc ring 19 and on the other hand with a nose 23 engaging a recess 24 of the blocking lever 25 movable on the axis 26. Thereby the drop worm 9 remains in contact with the worm gear 3 by blocking the arms 11 in their uppermost position.
  • the blocking lever 25 has a plug 27 which contacts a disc 29 in an annular recess 28 of the worm gear 9.
  • Stay bolts 30 are fixed in the disc 29, and the stay bolts reach through bored holes in the worm gear 3 contacting the disc ring 19.
  • the stay bolts 39 are surrounded by pressure springs 31 to ensure that contact.
  • the drop worm 9 is located in its out position on the floor of the casing 1 and it is held there by a tension spring 32 which is fixed on the arm 11. That is the position in which the feed can be exerted by hand by turning the hand wheel. If a change to the automatic feed shall take place, then one of the levers 6 must be turned in the direction of the arrow C (Fig. l), to move the disc ring 19 against the pressure spring 18. By that displacement thumb 22 and the arms 11 are moved in the direction of the arrow D, so that the nose 23 engages the recess 24 in the blocking lever 25. In that moment the drop worm 9 engages and drives the worm gear 3. That position is locked by the extension spring 34 on the lever 33 which is turnable around the bolt 26 of the blocking lever 25, as it is shown in Fig. 4. The other end of the extension spring 34 is fixed on the bolt 36.
  • the disengaging of the automatic feed device is exerted by hand by turning the hand lever 6 contrary to the direction of the arrow C (Fig. 1), so that the disc ring 19 is moved in the direction of the gear wheel 3.
  • the stay bolts 30 follow that movement and therefore the blocking lever 25 releases the nose 23 and the drop worm falls down to the bottom. That retract is aided by the tension spring 32.
  • the disengaging of the automatic feed device of the carriage can also be exerted by a block adjustably mounted on the lathe bed in a usual way.
  • the two-armed lever 35 is turnable around the bolt 36.
  • One arm of the lever 35 has an inclined gliding surface 37 attached to the roll 38 on the free end of the lever 33, as it is shown in Figs. 4 and 5.
  • the other end of the lever 35 is formed to a fork 39 which embraces the block 42, adjustable on the rod 40 under the pressure of a spring 41.
  • the block 42 is moved contrary to the tension of the spring 41, so that the two-armed lever 35 is turned, thereby the gliding surface 37 gives free the roll 38, the lever 33 is turned and therefore the nose 23 is disengaged.
  • the nose 23 lets fall the drop worm 9 and the worm gear 3 is stopped.
  • the hand levers 6 are fixed in the holders 12 by clamping screws 43.
  • the levers 6 can be taken out of their holders by loosening the clamping screws, which is expedient for the transport of the machine.
  • the hub 5 and the holders 12 are secured by a cap 44, which is held in its position by screws or wire snaps.
  • the bottom of the casing 1 is formed as an oiling bath into which the drop worm immerses, to secure a good lubrication of the gear.
  • a feeding device for the carriage of lathes and turret lathes provided with means for hand feed and power feed, a casing fixed on said lathe, a driving shaft journalled in said casing, a drop worm operatively connected to said driving shaft, arms turnable on said driving shaft and carrying said drop worm, a hollow shaft iournalled in said casing, a pinion fixed at the free end of said hollow shaft to drive said carriage, the axis of said hollow shaft being directed vertically to the axis of said driving shaft, a Worm gear fixed on saidhollow shaft, a bar slidingly located inside of said hollow shaft, at least one hand lever connected with said slide bar and with said;hollow shaft and. means operatively connected to said slide bar and to said turnable. arms: to disengage said drop worm: from said worm gear by; a movement of. said hand lever in the direction towards'the: lathe.
  • a hub fastened? to said. casing a holder. embracing said. hand lever, a bolt fixed in said holder. and journalled in said hub, the axis of said bolt extending; vertically to said hollow shaft, a disc. ring; slidably located: on said. hollow shaft and being connected. to said slide bar, anose fastened on said turnable arms, a. blocking lever for said nose operatively connected. with. said disc: ring. to transmit the movement of; said hand lever' to said blocking lever.
  • a feeding device in a, feeding device. according to claim 2; longitudi'nal' slots in said hollow shaft, a wedge. movable in said slots and being connected with said slide bar andsaid disc ring, a spring located on said hollow shaft. and adapted to be pressed against said di'sc; ring, displaceable stay bolts. carried by said Worm gear and being; in contact with said disc: ring, a recess in said worm gear, an annular disc located in said recess and being. in contactwithsaid stay bolts, said blocking lever beingin contact with said annular disc, arecess insaid blocking lever. to support said nose in the engaging position of said drop worm with said worm gear.
  • a. lever connected with said blocking lever, a. roll attachedv to the free end of said lever, a two-armedal'ever: rotatably journalled in said casing and having a gliding surface contacting said roll, adjustable block provided on the other arm. of said two-armed lever, a spring contacting said block and being located in the way of said carriage to disengage automatically-the blocking. position of said drop worm with said worm gear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Transmission Devices (AREA)

Description

Nov. 9, 1954 Filed May 1, 1951 W. MGBIUS FEEDING DEVICE FOR THE CARRIAGE OF LATHES AND TURRET LATHES 5 Sheets'Sheet l by W 4 Altar/leg Nov. 9, 1954 w. MOBIUS 2,693,731
FEEDING DEVICE FOR THE CARRIAGE OF LATHES AND TURRET LATHES Filed May 1, 1951 3 Sheets-Sheet 2 8 1 z[ Q i ll] NIH H |l||| lilillllllllllllfla Fig. 2
Jnrehzor by rwg Nov. 9, 1954 w. MOBIUS 2,693,731
FEEDING DEVICE FOR THE CARRIAGE OF LATHES AND TURRET LATHES Filed May ,1, 1951 s Sheets-Sheet 5 M4 1. I'ER A! 081145 Attorney United States Patent Ohice 2,693,731 Patented Nov. 9, 1954 FEEDING DEVICE FOR THE CARRIAGE OF LATHES AND TURRET LATHES Walter Miibius, Bielefeld, Germany, assignor to Werkzeugmaschinenfahrik Giidemeister & Comp., AM.- Ges., Bielefeld, Germany Application May 1, 1951, Serial No. 227,363
Claims priority, application Germany May 2, 1950 The feeding device for the carriage of lathes and turret lathes is often equipped with an adjusting device controlled by hand which serves simultaneously for the throwing into gear and out of gear of the automatic feed device. But the known constructions of these engaging means have the disadvantage that the throwing into gear of the automatic feed device is difficult if the tooth system, serving as a clutch for the driving member, does not make contact instantly.
Another disadvantage of the known feeding devices is the necessity to move the hand wheel or the hand lever toward the lathe for throwing into gear the automatic feed device. Hence an unintentional engaging may occur, if the workman leans against the hand lever.
The development of the hand wheel control according to the invention removes these disadvantages.
A main feature of the invention is the connection of the hand wheel and particularly of the hand levers with a drop Worm which is driven by the shaft of the feeding device instead of the toothed gear used hitherto. That drop worm will be engaged to a worm gear located on the axis of the hand wheel or the hand levers, if that control part is moved in the direction away from the lathe. That arrangement guarantees a throwing into gear of the automatic feed device instantly and without difiiculties. An unintentional engaging of these parts cannot occur because the hand lever must always be moved in the direction away from the lathe, if the automatic feed devices shall be engaged.
Another advantage is the possibility to disengage the automatic feed device by an adjustable block on the carriage.
An example of the invention is shown on the drawings.
Fig. l is a section through the manual engaging device;
Fig. 2 is a section through the lower part of the device to line EE of Fig. 1;
Fig. 3 is a detail;
Fig. 4 is another section through the manual engaging device; and
Fig. 5 is a detail.
The hollow axis 2 is rotating in the casing 1 and carries on its end directed towards the lathe a pinion 4 which engages the gear rack of the carriage (not shown in the drawings). A hub 5 is located on the other end of the axis which carries inside the casing a worm gear 3. The driving shaft 7 for the automatic feed device is rotating in bearings on the casing 1 below the hollow axis 2. A drop worm 9 is driven by the shaft '7 by means of pinions 8. The axis 10 of the drop worm 9 is located in arms 11 which are swinging around the shaft 7 to throw the drop worm in and out of gear with the worm gear 3.
The up or down movement of the drop worm 9 is exerted by the moving of the hand levers 6. Several of these levers, mostly four, are located in the hub 5 and they form together the hand wheel which is used for the hand feeding mechanism. The hand levers 6 are fixed in holders 12 which are turnable around the bolts 13 located with their axis transverse to axis 2. Therefore the holders can be moved in planes parallel and radial to the axis 2. The hand levers 6 have on their inner ends thumbs 14 which engage into the annular groove 15 of a disc 16, fixed on the end of a sliding bar 17 located in the hollow axis 2.
A disc ring 19 is sliding on the axis 2 under the influence of a pressure spring 18; the hub 19 of the disc ring 19 carries a Wedge 21 which is movable in the longitudinal 6 Claims.
slots 20 of the hollow axis 2; the wedge is moreover connected with the sliding bar 17.
Thereby the disc ring 19 is joined with the hand levers 6 and both parts must be moved together.
One of the arms 11 is provided with a thumb 22 laying against the disc ring 19 and on the other hand with a nose 23 engaging a recess 24 of the blocking lever 25 movable on the axis 26. Thereby the drop worm 9 remains in contact with the worm gear 3 by blocking the arms 11 in their uppermost position.
The blocking lever 25 has a plug 27 which contacts a disc 29 in an annular recess 28 of the worm gear 9. Stay bolts 30 are fixed in the disc 29, and the stay bolts reach through bored holes in the worm gear 3 contacting the disc ring 19. The stay bolts 39 are surrounded by pressure springs 31 to ensure that contact.
The drop worm 9 is located in its out position on the floor of the casing 1 and it is held there by a tension spring 32 which is fixed on the arm 11. That is the position in which the feed can be exerted by hand by turning the hand wheel. If a change to the automatic feed shall take place, then one of the levers 6 must be turned in the direction of the arrow C (Fig. l), to move the disc ring 19 against the pressure spring 18. By that displacement thumb 22 and the arms 11 are moved in the direction of the arrow D, so that the nose 23 engages the recess 24 in the blocking lever 25. In that moment the drop worm 9 engages and drives the worm gear 3. That position is locked by the extension spring 34 on the lever 33 which is turnable around the bolt 26 of the blocking lever 25, as it is shown in Fig. 4. The other end of the extension spring 34 is fixed on the bolt 36.
The disengaging of the automatic feed device is exerted by hand by turning the hand lever 6 contrary to the direction of the arrow C (Fig. 1), so that the disc ring 19 is moved in the direction of the gear wheel 3. The stay bolts 30 follow that movement and therefore the blocking lever 25 releases the nose 23 and the drop worm falls down to the bottom. That retract is aided by the tension spring 32.
The disengaging of the automatic feed device of the carriage can also be exerted by a block adjustably mounted on the lathe bed in a usual way. For that purpose the two-armed lever 35 is turnable around the bolt 36. One arm of the lever 35 has an inclined gliding surface 37 attached to the roll 38 on the free end of the lever 33, as it is shown in Figs. 4 and 5. The other end of the lever 35 is formed to a fork 39 which embraces the block 42, adjustable on the rod 40 under the pressure of a spring 41.
If the carriage strikes the block on the lathe bed, then the block 42 is moved contrary to the tension of the spring 41, so that the two-armed lever 35 is turned, thereby the gliding surface 37 gives free the roll 38, the lever 33 is turned and therefore the nose 23 is disengaged. The nose 23 lets fall the drop worm 9 and the worm gear 3 is stopped.
The pressure springs 18 and 31 etfect in contrary directions, so that their pressure can be regulated to bring the lever 6 after the termination of the control movement to a middle position.
The hand levers 6 are fixed in the holders 12 by clamping screws 43. The levers 6 can be taken out of their holders by loosening the clamping screws, which is expedient for the transport of the machine.
The hub 5 and the holders 12 are secured by a cap 44, which is held in its position by screws or wire snaps. The bottom of the casing 1 is formed as an oiling bath into which the drop worm immerses, to secure a good lubrication of the gear.
Having thus described the invention, what I claim as new and desire to be secured by Letters Patent, is as follows:
1. In a feeding device for the carriage of lathes and turret lathes provided with means for hand feed and power feed, a casing fixed on said lathe, a driving shaft journalled in said casing, a drop worm operatively connected to said driving shaft, arms turnable on said driving shaft and carrying said drop worm, a hollow shaft iournalled in said casing, a pinion fixed at the free end of said hollow shaft to drive said carriage, the axis of said hollow shaft being directed vertically to the axis of said driving shaft, a Worm gear fixed on saidhollow shaft, a bar slidingly located inside of said hollow shaft, at least one hand lever connected with said slide bar and with said;hollow shaft and. means operatively connected to said slide bar and to said turnable. arms: to disengage said drop worm: from said worm gear by; a movement of. said hand lever in the direction towards'the: lathe.
2. In a. feeding device. according to claim. 1, a hub fastened? to said. casing,. a holder. embracing said. hand lever, a bolt fixed in said holder. and journalled in said hub, the axis of said bolt extending; vertically to said hollow shaft, a disc. ring; slidably located: on said. hollow shaft and being connected. to said slide bar, anose fastened on said turnable arms, a. blocking lever for said nose operatively connected. with. said disc: ring. to transmit the movement of; said hand lever' to said blocking lever.
3r. In a, feeding device. according to claim 2; longitudi'nal' slots in said hollow shaft, a wedge. movable in said slots and being connected with said slide bar andsaid disc ring, a spring located on said hollow shaft. and adapted to be pressed against said di'sc; ring, displaceable stay bolts. carried by said Worm gear and being; in contact with said disc: ring, a recess in said worm gear, an annular disc located in said recess and being. in contactwithsaid stay bolts, said blocking lever beingin contact with said annular disc, arecess insaid blocking lever. to support said nose in the engaging position of said drop worm with said worm gear.
4. In a feeding device according to claim 2, a. thumb fixed on said turnable arms and being in contact with saiddisc. ring, a draw spring connected with said turnable arms and said casing to Withdraw said drop worm after the disengagement of saidnose by rotating saidblocking lever.
5. In a feeding device according to claim 3, springs surrounding said stay bolts. to. produce a contact of said stay bolts with said disc ring, the pressing force of said springs being equal to: the force of the Spring surrounding said disc ring to stop said hand lever; in its middle position.
6. In a feeding device: according to. claim 1,. a. lever connected: with said blocking lever, a. roll attachedv to the free end of said lever, a two-armedal'ever: rotatably journalled in said casing and having a gliding surface contacting said roll, adjustable block provided on the other arm. of said two-armed lever, a spring contacting said block and being located in the way of said carriage to disengage automatically-the blocking. position of said drop worm with said worm gear.
References Giterk in. the file ofi this. patent UNITED STATES PATENTS Number. Name Date 801,012. Howard. Oct. 3,. 1.905v 939,043 Libby .No.v..2, 1909 1,026,595 Milne: May 1.4-; 1912.
1,027,496 Mills May 28, 1912.
1,071,539 Weigel' Aug. 26, 1913 FGREIGN PATENTS Number. Country Date 688,275 Germany Feb. 16,. 1940
US227363A 1950-05-02 1951-05-01 Feeding device for the carriage of lathes and turret lathes Expired - Lifetime US2693731A (en)

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DE295165X 1950-05-02

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CH (1) CH295165A (en)
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GB (1) GB695412A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934974A (en) * 1957-10-21 1960-05-03 Warner Swasey Co Feed mechanism having a manual override
US3008155A (en) * 1957-05-01 1961-11-14 Tsuda Masao Drilling and thread cutting machine
US3102445A (en) * 1959-07-16 1963-09-03 Martin D Elledge Lathe tool holding and operating attachment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US801012A (en) * 1904-02-16 1905-10-03 Chapman Valve Mfg Co Disconnecting mechanism.
US939043A (en) * 1908-02-06 1909-11-02 Charles L Libby Feed for lathes.
US1026595A (en) * 1911-01-03 1912-05-14 Rockford Drilling Machine Co Feeding attachment for drill-spindles.
US1027496A (en) * 1911-07-22 1912-05-28 Fitchburg Machine Works Lathe.
US1071539A (en) * 1913-04-10 1913-08-26 Kokomo Nail And Brad Company Feed mechanism for drill-presses.
DE688275C (en) * 1938-02-25 1940-02-16 Hermann Schoening Drilling machine, in particular radial drilling machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US801012A (en) * 1904-02-16 1905-10-03 Chapman Valve Mfg Co Disconnecting mechanism.
US939043A (en) * 1908-02-06 1909-11-02 Charles L Libby Feed for lathes.
US1026595A (en) * 1911-01-03 1912-05-14 Rockford Drilling Machine Co Feeding attachment for drill-spindles.
US1027496A (en) * 1911-07-22 1912-05-28 Fitchburg Machine Works Lathe.
US1071539A (en) * 1913-04-10 1913-08-26 Kokomo Nail And Brad Company Feed mechanism for drill-presses.
DE688275C (en) * 1938-02-25 1940-02-16 Hermann Schoening Drilling machine, in particular radial drilling machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008155A (en) * 1957-05-01 1961-11-14 Tsuda Masao Drilling and thread cutting machine
US2934974A (en) * 1957-10-21 1960-05-03 Warner Swasey Co Feed mechanism having a manual override
US3102445A (en) * 1959-07-16 1963-09-03 Martin D Elledge Lathe tool holding and operating attachment

Also Published As

Publication number Publication date
CH295165A (en) 1953-12-15
FR1042923A (en) 1953-11-04
GB695412A (en) 1953-08-12

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