US3676957A - Spring grinding machines - Google Patents

Spring grinding machines Download PDF

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Publication number
US3676957A
US3676957A US30691A US3676957DA US3676957A US 3676957 A US3676957 A US 3676957A US 30691 A US30691 A US 30691A US 3676957D A US3676957D A US 3676957DA US 3676957 A US3676957 A US 3676957A
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United States
Prior art keywords
carriage
grindstones
springs
plate
opening
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 - Lifetime
Application number
US30691A
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English (en)
Inventor
Jacques Pierre Alb Herckelbout
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HERCKELBOUT ET FILS
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HERCKELBOUT ET FILS
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Publication date
Application filed by HERCKELBOUT ET FILS filed Critical HERCKELBOUT ET FILS
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/167—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings end faces coil springs

Definitions

  • the present invention concerns a machine for grinding hecoid springs which simultaneously permits all the springs to be [52] US. Cl ..51/118 d, i d b a magazinelate which is circular, rotary Field ofSearch ..5l/l09, 111,117,118, 165.79
  • Such machines are known, formed principally by two grindstones placed facing one another and whose shafts are placed along a same axis, said grindstones being moveable along said axis.
  • the springs are supported by a magazine and their extremities extend beyond the faces of said magazine to be placed between the faces of the grind stones.
  • a magazine is known, constituted by a plate of small surface with respect to the active face of the grindstones, and comprising holes in each of which a spring is introduced axially, said plate being mounted at the extremity of an oscillating arm allowing to move the springs substantially radially with respect to said grindstones and in a to and fro motion so as to ensure a uniform wear.
  • the grinding is done by introducing a portion of the magazine plate between the grindstones.
  • the magazine plate is driven in rotation at slow speed, or freely mounted on an axis parallel to those of the grindstones.
  • the time necessary to grind a spring depends on the speeds of advance and of rotation of the grindstones, their quality, the power of the machine, the desired finish of the surfaces, and is therefore independent of the number of springs subjected to the abrasive action of the grindstones.
  • the oscillating plate can comprise but a fairly small number of springs for one is limited by the dimensions of the grindstones; an increase in their diameter leads to machines which are too cumbersome.
  • the present invention which remedies these drawbacks, concerns a machine of the type referred to above, with a magazine plate driven in rotation independently of the grindstones, characterized in that the magazine plate is removable and can be arranged between the grindstones so that all the springs it supports are simultaneously subjected to the action of said grindstones, the axis of rotation of said plate being parallel to that of the grindstones so that each of the extremities of each of the springs describes, with respect to said grindstones, an eccentric circumferential trajectory, means being additionally provided to ensure the holding and driving of said plate.
  • Holding of the plate between the grindstones is provided by at least one shaft sliding inside the shaft of the corresponding grindstone, and one of the extremities of which can engage in the hub of the plate.
  • FIG. 1 is a view in longitudinal section of the device for operating one of the two grindstones and a portion of the second grindstone according to the present invention
  • FIG. 2 is a view in section taken along line II-II of FIG. 1 and limited to the magazine-plate and to one of the two grindstones;
  • FIG. 3 is a view in section taken along line IIIIII of FIG. 1;
  • FIGS. 4 and 5 are views similar to FIG. 1, limited to its extreme portions showing in particular the possibility of moving axially the supporting shaft of the magazine-plate independently of the grindstones;
  • FIG. 6 is a diagrammatic view illustrating the possibility of advancing the grindstones according to a predetermined law.
  • the magazine-plate 1 is constituted by a disk comprising, towards it periphery, one or several eccentric rows of holes 1' whose axes are parallel to those of said plate and in which one introduces the springs R to be ground.
  • the plate 1 can be placed between the two grindstones 2, whose active part is limited to a peripheric crown, so that the extremities of all the springs R can be subjected simultaneously to the action of said grindstones.
  • the device for the positioning of the plate can be constituted by a pincer with two jaws surrounding the periphery of said plate and made solidary with a carriage sliding under a rectilinear guide arranged above the machine perpendicularly to the axis of said plate.
  • Each of the grindstones 2 is fixed to the extremity of a hollow shaft 3 which can revolve within bearings 4 fixed in a carriage 5 guided in translation, along the axis of said shaft, on a fixed table 6 forming the upper part of the frame of the machine, not represented.
  • the shaft 3 is connected axially to the carriage 5.
  • the driving in rotation of the shaft 3 is provided by an electric motor 7 arranged under the table 6 and connected to the carriage 5 by a supporting bracket 8 traversing said table 6 which has, for this purpose, an opening 9.
  • the movement of rotation is transmitted to a pulley 10 keyed to the shaft 3, by belts l1 traversing an opening 12 of the carriage and opening 9 of table 6.
  • each of the grindstones can be provided by a jack l3, situated in the opening 9, one extremity of which is connected to the table 6, while the other is connected to a bracket 14 of the carriage 5 extending in said opening 9.
  • Each of the shafts 16 can revolve and slide in three bearings 17, 18 and 19.
  • Bearings 17 and 18 are mounted on the carriage 5, said bearing 17 having an extension 17' extending inside the shaft 3 and terminating in bearing 18.
  • Bearing 19 is mounted on the table 6 and it rotatably supports a pinion 20 driving the shaft 16 by means of a sliding keyway.
  • the axial movement of the shaft 16 is provided by a double acting jack 2], attached to and bearing against the table 6 and acting on a lever 22 articulated at 23 on said table, by one of its extremities, the other extremity of lever 22 has a fork to drive said shaft.
  • the driving in rotation of plate 1 is provided by a simple device such as spurs 24 carried by said plate and situated on the trajectory of fingers 25 carried by the extremity 15 of the shafts 16.
  • the axes of shafts 3 and 16 are parallel so that plate 1 is offcenter with respect to the grindstones 2, the value of this offcenter dimension being determined so that all the springs carried by said plate are always in contact with the abrasive surfaces, as shown in FIG. 2, and wear them down in a-uniform manner.
  • the aforementioned off-center dimension is given a value such that the springs R extend beyond the abrasive surfaces, towards the outside as well as towards the inside, by an-amount substantially equal to the diameter of the wire used in making said springs.
  • FIG. 1 represents the position the machine during grinding.
  • the mobile jaw device surrounds the periphery of plate 1, the jacks 21 are then actuated so as to determine the return of the shafts 16 (FIG. 5) to free said plate which is then withdrawn by said forementioned device.
  • the plate 1 can be placed by hand, the positioning being assured in simple manner by means of a centering Vee, as shown schematically in FIG. 2.
  • the speed of advance of the grindstones must vary according to a precise mathematical law, but such precision cannot be obtained by controlling the advance of the grindstones by means of hydraulic jacks.
  • each of the carriages 5 is applied by means of the corresponding jack 13, against a cam 26 driven by a shaft 27 revolving through one complete rotation for one cycle (FIG. 6) and whose profile is calculated to allow the advance of the grindstones according to a predetermined law of speeds.
  • the speed of rotation of the shaft 27 can be modified at will and at any moment thus allowing, particularly with the same cam and without loss of time, to bring the grindstones together under optimal conditions with respect to the degree of grinding envisioned.
  • an end-of-travel contact (not represented) controls the inversion of the jacks and, consequently, the rapid return of the grindstones, the value of this return being greater than the advance permitted by said cams.
  • a detachable circular magazine-plate having peripheric holes to receive the springs, a pair of grindstones placed facing one another and one either side of said magazine-plate so that all the springs being supported are subjected simultaneously to the action of said grindstones and, for operating of each of said grindstones, a fixed table, a carriage moveable in translation on said table, bearings on said carriage, a hollow shaft in these hearings, said shaft having its axis parallel to the direction of movement of said carriage and carrying at one of its extremities the corresponding grindstone, an opening in said table, a bracket under said carriage extending beyond said opening to support an electric motor to drive said hollow shaft in rotation, a second bracket under said carriage extending in said opening, a hydraulic jack in said opening having one extremity connected to said table while its other extremity is connected to said second bracket, a stop movable according to a mathematical law against which said carriage bears during its advance and means to drive the
  • a removable circular magazine-plate having peripheric holes to receive the springs, a pair of grindstones placed facing one another and one either side of the magazine-plate so that all the springs being supported are subjected simultaneously to the action of said grindstones and, for operating each of said grindstones, a fixed table, a carriage guided in translation on said table, bearings on said carriage, a hollow shaft in said bearings, said hollow shaft having its axis parallel to the direction of movement of said carriage and carrying at one of its extremities the corresponding grindstone, an opening in said table, a bracket under said carriage extending beyond said opening to support an electric motor to drive said hollow shaft in rotation, 21 second bracket under said carriage extending in said opening, a hydraulic jack in said opening having one end connected to said table while its other end is connected to said second bracket, a stop mobile according to a mathematical law against which said carriage bears during its advance a shaft moveable axially and in rotation inside said hollow

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US30691A 1969-04-25 1970-04-22 Spring grinding machines Expired - Lifetime US3676957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6913219A FR2041917A5 (enrdf_load_stackoverflow) 1969-04-25 1969-04-25

Publications (1)

Publication Number Publication Date
US3676957A true US3676957A (en) 1972-07-18

Family

ID=9033077

Family Applications (1)

Application Number Title Priority Date Filing Date
US30691A Expired - Lifetime US3676957A (en) 1969-04-25 1970-04-22 Spring grinding machines

Country Status (4)

Country Link
US (1) US3676957A (enrdf_load_stackoverflow)
DE (1) DE2020255C3 (enrdf_load_stackoverflow)
FR (1) FR2041917A5 (enrdf_load_stackoverflow)
GB (1) GB1289891A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845587A (en) * 1972-12-01 1974-11-05 H Klievoneit Radial surface finishing apparatus
US4592169A (en) * 1984-08-07 1986-06-03 St. Florian Company, Ltd. Disc grinder with floating grinding wheel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2168596A (en) * 1935-09-12 1939-08-08 Gardner Machine Co Control apparatus for grinding machines
US2297045A (en) * 1939-06-16 1942-09-29 Bergstrom John Erik Centerless grinding machine
US2328809A (en) * 1941-05-23 1943-09-07 Bower Roller Bearing Co Lapping machine
US2424448A (en) * 1943-08-06 1947-07-22 Gardner Machine Co Grinding machine
US2753667A (en) * 1954-01-21 1956-07-10 Whitelaw Alan Roy Machines for grinding the ends of coiled springs and other articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2168596A (en) * 1935-09-12 1939-08-08 Gardner Machine Co Control apparatus for grinding machines
US2297045A (en) * 1939-06-16 1942-09-29 Bergstrom John Erik Centerless grinding machine
US2328809A (en) * 1941-05-23 1943-09-07 Bower Roller Bearing Co Lapping machine
US2424448A (en) * 1943-08-06 1947-07-22 Gardner Machine Co Grinding machine
US2753667A (en) * 1954-01-21 1956-07-10 Whitelaw Alan Roy Machines for grinding the ends of coiled springs and other articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845587A (en) * 1972-12-01 1974-11-05 H Klievoneit Radial surface finishing apparatus
US4592169A (en) * 1984-08-07 1986-06-03 St. Florian Company, Ltd. Disc grinder with floating grinding wheel

Also Published As

Publication number Publication date
DE2020255B2 (de) 1973-07-19
FR2041917A5 (enrdf_load_stackoverflow) 1971-02-05
GB1289891A (enrdf_load_stackoverflow) 1972-09-20
DE2020255C3 (de) 1974-02-07
DE2020255A1 (de) 1970-12-23

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