US3594962A - Grinding machines - Google Patents

Grinding machines Download PDF

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Publication number
US3594962A
US3594962A US822470A US3594962DA US3594962A US 3594962 A US3594962 A US 3594962A US 822470 A US822470 A US 822470A US 3594962D A US3594962D A US 3594962DA US 3594962 A US3594962 A US 3594962A
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US
United States
Prior art keywords
frame
shaft
screw
threaded spindle
grinding
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
US822470A
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English (en)
Inventor
Stig Oskar Christensson
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.)
CHRIS MARIN AB
Original Assignee
CHRIS MARIN AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHRIS MARIN AB filed Critical CHRIS MARIN AB
Application granted granted Critical
Publication of US3594962A publication Critical patent/US3594962A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor

Definitions

  • the machine is provided with a frame which is rotatable about a shaft adapted to be arranged in a valve stem bore and carries an arm which is mounted to be displaceable in an inclined track which is arranged in the frame and extends in a plane coinciding with the longitudinal direction of the shaft, the said arm carrying a holder for a grinding wheel and a driving motor associated with the said wheel, and also being displaced by means of a screw-threaded spindle which is mounted to be rotatable but axially nondisplaceable in the frame, the said screw-threaded spindle being provided at its upper end with a conveniently removable handle for turning the frame about the shaft, means being provided for converting a relative movement, brought about on rotation of the frame by means of the handle, between the frame and the screw-threaded spindle into a displacement of the arm, so that the grinding wheel,
  • the present invention relates to a grinding machine for the grinding of valve seats in marine engines.
  • gOOd sealing of valve seats is necessary, but owing to the temperatures which occur during combustion in the cylinder it is easy for burning-in phenomena or similar damage to occur at the valve seat, which consequently has to be reground frequently.
  • this regrinding must be carried out with great precision, which may involve almost insurmountable difficulties under the conditions often prevailing on board a ship. It should also be possible to carry out this work in a relatively short time.
  • the present invention has as its object to provide a grinding machine suitable for the purpose indicated here.
  • the grinding machine according to the invention consists of a frame which is rotatable about a shaft adapted to be arranged in a valve stem bore, and carries an arm which is mounted to be displaceable in an inclined track which is arranged in the frame and which extends in a plane coinciding with the longitudinal direction of the shaft, the said am comprising a holder for a grinding wheel and a driving motor associated therewith, and also being displaced by means of a screw-threaded spindle mounted to be rotatable but axially nondisplaceable in the frame, the said screw-threaded spindle being provided at its upper end with a conveniently removable handle for turning the frame about the shaft, means being provided for converting a relative movement between frame and screw-threaded spindle, brought about on rotation of the frame by means of the handle,-into a displacement of the arm, so that the grinding wheel, as a result of the direction of rotation of the frame
  • FIG. I shows a side view of a grinding machine according to the present invention in a grinding position
  • FIG. 2 shows on a larger scale a side view of the same device shown partly in section;
  • FIG. 3 shows a plan view of this device corresponding to FIG. 2.
  • the grinding machine of the present invention comprises a frame 1 which is mounted to be rotatable on a shaft 2 which itself is adapted to be inserted and arranged in a valve stem bore of a marine engine 3.
  • the frame I carries an arm 4 mounted in an inclined manner, with a holder 5 for accommodating a grinding wheel 6 and a driving motor 7 associated therewith.
  • a screw-threaded spindle 8 is also mounted in the frame I to be rotatable but axially nondisplaceable, its upper end being constructed as a stud 8' of noncircular cross section which corresponds to the lower end of a correspondingly shaped sleeve 9' of a handle 9 constructed as a socket wrench and adapted to be fitted on the stud 8, for turning the frame 1 about theshaft 2.
  • the shaft 2 is provided with a connection 10 for a hose 11 leading to a source of compressed air (not shown). The compressed air is introduced through the shaft 2 and also through the hose 1] to the driving motor 7 for the grinding wheel 6.
  • FIG. 2 the grinding machine is shown on a larger scale with its component parts: frame 1, arm 4, holder 5, and driving motor 7 for the grinding wheel 6. But in this figure the frame I is shown partly in section in order to illustrate how the screwthreaded spindle 8 extends down through the frame 1 and is screwed to a slide displaceable in the said frame.
  • the slide 12 has an elongated aperture 13 into which a pin 14 fixed to the arm 4 engages, so that when the slide 12 is displaced vertically the arm 4 is also obliged to carry out a displacement movement in the inclined track associated therewith in the frame 1, the arm 4 with the holder 5, depending on the direction in which the frame 1 is turned by means of the handle 9, being displaced either obliquely upwards and outwards or obliquely downwards and inwards.
  • the frame 1 is also displaceable together with the grinding wheel 6 by an adjusting screw 15 relatively to the shaft 2 on a supporting angle 16 whose lower end is equipped with a bearing 17 whereby the entire grinding machine is supported, and is rotatable about the upper end of the shaft 2.
  • the regrinding of a valve seat with a grinding machine is carried out as follows.
  • the grinding machine is introduced with its shaft 2 into the valve stem bore of the valve seat I8 to be reground and its grinding wheel 6 is made to abut on the valve seat.
  • the frame I is turned by means of the handle 9 placed on the stud 8 of the screw-threaded spindle, whereby a relative rotation occurs between the screwthreaded spindle 8 and the slide 12, and the slide 12 owing to be engaged by means of screw threading with the screwthreaded spindle 8 is displaced either upwards or downwards in a vertical along the said spindle, depending on the direction of rotation of the frame 1.
  • the arm 4 Owing to the engagement of the pin 14 in the aperture 13 of the slide 12, the arm 4 is displaced in the inclined track associated therewith in the frame 1 and the grinding wheel 6 is displaced along the valve seat 18, regrinding the said seat.
  • the present invention provides a versatile grinding machine which is suitable more particularly for rapid and precise regrinding-more especially of valve seats, and as a particular advantage there may be mentioned the possibility of surmounting the frame 1 on the shaft 2 by means of a supporting angle 16 that the grinding wheel 6 can be displaced to such an extent in the direction of the center of the valve seat that its inner edge can be taken almost up to or even over the center.
  • regrinding can be carried out much nearer to the center than has been possible hitherto.
  • a grinding machine more particularly for the grinding of valve seats in marine engines, wherein the improvement comprises a frame which is rotatable about a shaft adapted to be arranged in a valve stem bore andcarries an arm which is mounted to be displaceable in an inclined track which is arranged in the frame and extends in a plane coinciding with the longitudinal direction of the shaft, the said arm carrying a holder for a grinding wheel and a driving motor associated with the said wheel, and also being displaced by means of a screw-threaded spindle which is mounted to be rotatable but axially nondisplaceable in the frame, the said screw-threaded spindle being provided at its upper end with a conveniently removable handle for turning the frame about the shaft, means being provided for converting a relative movement, brought about on rotation of the frame by means of the handle, between the frame and the screw-threaded spindle into a displacement of the arm, so that the grinding wheel, depending on the direction of rotation of the frame, is displaced either obliquely upwards and
  • a grinding machine comprising movement-converting means that consist of a slide engaging by means of screw threading with the screw-threaded spindle in order to be displace in a vertical sense on rotation of the aforesaid screw-threaded spindle in an aperture in the frame, and that the arm is provided with a pin engaging in a track in the slide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US822470A 1968-05-10 1969-05-07 Grinding machines Expired - Lifetime US3594962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE6318/68A SE315221B (de) 1968-05-10 1968-05-10

Publications (1)

Publication Number Publication Date
US3594962A true US3594962A (en) 1971-07-27

Family

ID=20268374

Family Applications (1)

Application Number Title Priority Date Filing Date
US822470A Expired - Lifetime US3594962A (en) 1968-05-10 1969-05-07 Grinding machines

Country Status (9)

Country Link
US (1) US3594962A (de)
BE (1) BE732700A (de)
CH (1) CH492517A (de)
DE (1) DE1915161A1 (de)
FR (1) FR2008220A1 (de)
GB (1) GB1228675A (de)
NL (1) NL6905707A (de)
NO (1) NO123749B (de)
SE (1) SE315221B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388782A (en) * 1981-04-24 1983-06-21 The United States Of America As Represented By The Secretary Of The Navy Handhole seat resurfacing tool for naval pressure fired boilers
WO1994013432A1 (en) * 1992-12-08 1994-06-23 Peter Siegfried Gerick Grinding machine
US20200316746A1 (en) * 2019-04-02 2020-10-08 Ge-Hitachi Nuclear Energy Americas Llc Remote surface treatment systems and methods

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1877546A (en) * 1930-11-10 1932-09-13 Leavitt Machine Co Grinding machine
US1877782A (en) * 1930-10-02 1932-09-20 Leavitt Machine Co Valve seat grinder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1877782A (en) * 1930-10-02 1932-09-20 Leavitt Machine Co Valve seat grinder
US1877546A (en) * 1930-11-10 1932-09-13 Leavitt Machine Co Grinding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388782A (en) * 1981-04-24 1983-06-21 The United States Of America As Represented By The Secretary Of The Navy Handhole seat resurfacing tool for naval pressure fired boilers
WO1994013432A1 (en) * 1992-12-08 1994-06-23 Peter Siegfried Gerick Grinding machine
US20200316746A1 (en) * 2019-04-02 2020-10-08 Ge-Hitachi Nuclear Energy Americas Llc Remote surface treatment systems and methods

Also Published As

Publication number Publication date
SE315221B (de) 1969-09-22
GB1228675A (de) 1971-04-15
DE1915161A1 (de) 1970-08-20
NO123749B (de) 1972-01-10
FR2008220A1 (de) 1970-01-16
BE732700A (de) 1969-10-16
CH492517A (de) 1970-06-30
NL6905707A (de) 1969-11-12

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