US2419034A - Bearing and seal therefor - Google Patents

Bearing and seal therefor Download PDF

Info

Publication number
US2419034A
US2419034A US586953A US58695345A US2419034A US 2419034 A US2419034 A US 2419034A US 586953 A US586953 A US 586953A US 58695345 A US58695345 A US 58695345A US 2419034 A US2419034 A US 2419034A
Authority
US
United States
Prior art keywords
sleeve
bearing
spindle
bushing
lapping
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
US586953A
Inventor
Irving S Primus
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.)
REEVES ELY LAB Inc
REEVES-ELY LABORATORIES Inc
Original Assignee
REEVES ELY LAB Inc
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 REEVES ELY LAB Inc filed Critical REEVES ELY LAB Inc
Priority to US586953A priority Critical patent/US2419034A/en
Application granted granted Critical
Publication of US2419034A publication Critical patent/US2419034A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
    • B24B37/08—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for double side lapping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
    • H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
    • H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks

Definitions

  • This invention relates to the manufacture of quartz oscillator plates and has for its object certain improvements in apparatus employed in lapping blank oscillator plates.
  • the blank plates progressively follow an exceedingly tortuous path between and across the lapping surfaces of the lapping heads, while a generous supply of abrasive grit suspended in a suitable liquid vehicle. such as oil, is fed to the blank plates.
  • a suitable liquid vehicle. such as oil is fed to the blank plates.
  • Spattering and over-running of some of the abrasive grit on the apparatus are unavoidable and some of it finds its way quickly to the bearing or bearings disposed between the spindle and the sleeve. with resultant damage thereto. This necessitates a shut-down of the whole apparatus to clean. repair, or replace the afiected hearing or bearings.
  • the apparatus comprises a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, and a bearing between the sleeve and spindle.
  • a bushing is rotatably secured to the spindle at one end of the sleeve and a bearingshield is disposed exteriorly of and about the same end of the sleeve and a portion of the bushing.
  • a nut is rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
  • a plurality oi funnel-shaped wells 43 extends is a sectional view of the lower portion of an apparatus for lapping blank oscillator plates and which illustrates a practice of the invention.
  • the apparatus comprises a base only the upper wall ID of which is shown.
  • the base in turn supports a lower spindle H, to the lower end of which is secured a. variable speed pulley l2 connectible with a source of power (not shown).
  • the spindle extends vertically through a. bearing securing collar l3, 9. bearing sleeve 14, a sleeve support IS, a bushing 26 and into a support collar l'l.
  • Bearing securing collar I3 is threaded into the internally threaded lower end portion of the sleeve I4.
  • a lower thrust bearing I8 is mounted aboutspindle H within sleeve l4.
  • Sleeve support I5 is secured to sleeve I 4 by a set screw l9.
  • the sleeve support l4 includes a. radially extending annular flange 20 resting upon the upper side of wall l0 and is secured thereto by a plurality of screws 2
  • An upper thrust bearing 22 is mounted about spindle ll within sleeve l4.
  • the upper portion of sleeve I4 is covered with a bearing-shield 23 fitting loosely about the sleeve.
  • the upper portion of the bearing-shield is partly closed by an annular internally threaded portion 24 disposed on the outwardly extending annular shoulder portion 25 at the lower end of a threaded bushing 26 which is secured to spindle H by a set screw 21.
  • a nut 28 is screwed onto the threaded bushing and bears downwardly on annular portion 24 to assure a tight fit.
  • the outwardly extending annular shoulder portion 25 of the bushing 26 fits within the upper end of sleeve l4, immediately adjacent bearing 22.
  • spindle II At its upper end spindle II includes a tapered portion 30 having a wedge fit in the tapered socket of the support collar IT.
  • the lower portion of the support collar is thus located directly above lock nut 28 and the threaded bushing 28.
  • the collar I1 includes a rad ally extending upper flange 3
  • a lower rotating lapping head 35 is secured to horizontal support 32 by means of a plurality of spaced screws 36.
  • An upper lapping head 40 is disposed directly above the lower lapping head and is held in a substantially stationary position by mean not shown. Both lapping heads are annular in shape, being provided with aligned openings 4
  • a carrier-disc 45 is disposed between the two lapping heads, being provided with a fixed hub 45 secured thereto by a lock-nut 41.
  • the disc is operatively connected to a source of power, not shown, by means of an upper spindle 48 movable up or down by a quill 50 held thereon by a collar
  • the lower end of the upper spindle terminates in a crank arm 52 secured thereto by a set screw 53.
  • a pin 54 is carried by the far end of the crank arm and is provided with a hub 55. The free end of the pin 54 is adapted to fit loosely in hub 46 of the carrier-disc.
  • the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, and a nut rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
  • the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve immediately adjacent the bearing to retain the same in position, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, and a nut rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
  • the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve, said bushing being provided with an outwardly extending shoulder portion fitting within the sleeve immediately adjacent the bearing to retain the same in position, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, and a nut rotata y cured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
  • the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve, said bushing being provided with an outwardly extending shoulder portion fitting within the sleeve immediately adjacent the bearing to retain the same in position, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, said bearing-shield being provided with an inwardly extending annular portion engaging shoulder portion of the bushing, and a nut rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
  • the im rovement comprising a rotatable spindle, a stationary sleeve about said spindle, said sleeve internally threaded at one end, bearing means in the end portions in the sleeve and between the sleeve and spindle, a bushing including a portion extending along said spindle and a radial portion threaded into said end of the sleeve and retaining the bearing means therein.
  • a bushing at the other end of the sleeve and including a portion fixed to and extending longitudinally of the spindle and a radially extending portion entering the sleeve and retaining the bearing means in place therein, a bearing shield at the last-mentioned end port on of said sleeve, and said shield including a cylindrical portion disposed about said end portion of the sleeve and an inwardly directed portion dis osed against the end oi the sleeve and the outer side of the radially extending portion of the second-mentioned bushing and fixed to the latter.
  • the improvement comprising a vertically disposed rotatable spindle, a vertical stationary sleeve about said spindle, bearing means in the upper end portion of the sleeve and between the sleeve and said spindle, a bushing fixed to the spindle at the upper end of said sleeve, said bushing includin a portion extending longitudinally of and fixed to the spindle and a radially extending said outwardly extending 5 portion entering the sleeve and retaining the nearing means in place, a bearing shield about the upper end portion of said sleeve and said shield including a, cylindrical portion disposed about said end portion of the sleeve and an 5 inwardly directed portion disposed against the outer side of the radially extending portion of the bushing and threaded to the portion of the bushing extending longitudinally of the spindle.

Description

April 15, 1947. s. PRIMUS BEARING AND SEAL THEREFOR Filed April 6, 1945 INVENTOR. IRVING S. PRIMUS heads.
Patented Apr. 15, 1947 BEARING AND SEAL THEREFOR Irving S. Primus, New York, N. Y., assignor to Reeves-Ely Laboratories, Inc., New York, N. Y., a corporation of New York Application April 6, 1945, Serial No. 586,953
- 7 Claims. 1
This invention relates to the manufacture of quartz oscillator plates and has for its object certain improvements in apparatus employed in lapping blank oscillator plates.
In my co-pending application Serial No. 586,952, filed April 6, 1945, I have disclosed and claimed a method of and apparatus for lapping blank oscillator plates in accordance with which the plates are lapped between two superposed lapping heads, the lower head being rotated and the upper head being held substantially stationary. The lower lapping head is suitably connected to a spindle supported in a non-rotating sleeve, with anti-friction bearings disposed between the spindle and the sleeve. A power-driven carrier-disc is disposed between the two lapping The disc is provided with a plurality of spaced openings, in each of which is placed a blank oscillator plate. 1
During the lapping operat on, the blank plates progressively follow an exceedingly tortuous path between and across the lapping surfaces of the lapping heads, while a generous supply of abrasive grit suspended in a suitable liquid vehicle. such as oil, is fed to the blank plates. Spattering and over-running of some of the abrasive grit on the apparatus are unavoidable and some of it finds its way quickly to the bearing or bearings disposed between the spindle and the sleeve. with resultant damage thereto. This necessitates a shut-down of the whole apparatus to clean. repair, or replace the afiected hearing or bearings.
As a result of my investigations, I have discovered that an apparatus may be provided which prevents passage of the abrasive grit to the spindle bearings of the lower lapping head and thus overcomes the serious disadvantages outlined above.
In accordance with the invention, the apparatus comprises a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, and a bearing between the sleeve and spindle. A bushing is rotatably secured to the spindle at one end of the sleeve and a bearingshield is disposed exteriorly of and about the same end of the sleeve and a portion of the bushing. A nut is rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
These and other features of the invention will be better understood by referring to the accompanying drawing, taken in conjunction with the following description, in which the single figure 55 A plurality oi funnel-shaped wells 43 extends is a sectional view of the lower portion of an apparatus for lapping blank oscillator plates and which illustrates a practice of the invention.
The apparatus comprises a base only the upper wall ID of which is shown. The base in turn suports a lower spindle H, to the lower end of which is secured a. variable speed pulley l2 connectible with a source of power (not shown). The spindle extends vertically through a. bearing securing collar l3, 9. bearing sleeve 14, a sleeve support IS, a bushing 26 and into a support collar l'l. Bearing securing collar I3 is threaded into the internally threaded lower end portion of the sleeve I4. A lower thrust bearing I8 is mounted aboutspindle H within sleeve l4. Sleeve support I5 is secured to sleeve I 4 by a set screw l9. At its upper end the sleeve support l4 includes a. radially extending annular flange 20 resting upon the upper side of wall l0 and is secured thereto by a plurality of screws 2|. An upper thrust bearing 22 is mounted about spindle ll within sleeve l4.
To prevent ingress of abrasive material or other foreign particles, the upper portion of sleeve I4 is covered with a bearing-shield 23 fitting loosely about the sleeve. The upper portion of the bearing-shield is partly closed by an annular internally threaded portion 24 disposed on the outwardly extending annular shoulder portion 25 at the lower end of a threaded bushing 26 which is secured to spindle H by a set screw 21. A nut 28 is screwed onto the threaded bushing and bears downwardly on annular portion 24 to assure a tight fit. As shown, the outwardly extending annular shoulder portion 25 of the bushing 26 fits within the upper end of sleeve l4, immediately adjacent bearing 22.
At its upper end spindle II includes a tapered portion 30 having a wedge fit in the tapered socket of the support collar IT. The lower portion of the support collar is thus located directly above lock nut 28 and the threaded bushing 28. The collar I1 includes a rad ally extending upper flange 3| fitting into a centrally recessed portion of a horizontally disposed support 32 and is secured thereto by means of a plurality of screws 33. A lower rotating lapping head 35 is secured to horizontal support 32 by means of a plurality of spaced screws 36.
An upper lapping head 40 is disposed directly above the lower lapping head and is held in a substantially stationary position by mean not shown. Both lapping heads are annular in shape, being provided with aligned openings 4| and 42.
through the upper lapping head to receive a grit suspension and feed it into the space between the lapping heads.
A carrier-disc 45 is disposed between the two lapping heads, being provided with a fixed hub 45 secured thereto by a lock-nut 41. The disc is operatively connected to a source of power, not shown, by means of an upper spindle 48 movable up or down by a quill 50 held thereon by a collar The lower end of the upper spindle terminates in a crank arm 52 secured thereto by a set screw 53. A pin 54 is carried by the far end of the crank arm and is provided with a hub 55. The free end of the pin 54 is adapted to fit loosely in hub 46 of the carrier-disc.
As more fully described in the above-mentioned copending applications, with lapping blank oscillator plates confined in carrier-disc 45, lower lapping head 35 is rapidly rotated in one direction and crank arm 52 is rotated less rapidly in the opposite direction while a suspension of abrasive grit is fed through wells 43 to the blank plates. If, any of the abrasive grit should be spattered or run onto the parts below the lower lapping head, the construction shown effectively bars its passage to the interior of sleeve l4 and hence upper bearing 22 or lower bearing l8.
While the invention is illustrated in the case of apparatus particularly designed for the lapping of quartz oscillator plates, it will be clear to those skilled in this art that the construction shown, or modifications thereof, is useful for other purposes.
Having thus set forth the nature of my invention, what I claim is:
1. In apparatus of the character described, the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, and a nut rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
2. In apparatus of the character described, the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve immediately adjacent the bearing to retain the same in position, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, and a nut rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
3. In apparatus of the character described, the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve, said bushing being provided with an outwardly extending shoulder portion fitting within the sleeve immediately adjacent the bearing to retain the same in position, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, and a nut rotata y cured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
4. In apparatus of the character described, the improvement comprising a rotatable spindle connectible with a source of power, a sleeve mounted about the spindle, securing means to prevent rotation of the sleeve, a bearing between the sleeve and spindle, a bushing rotatably secured to the spindle at one end of the sleeve, said bushing being provided with an outwardly extending shoulder portion fitting within the sleeve immediately adjacent the bearing to retain the same in position, a bearing-shield disposed exteriorly of and about the same end of the sleeve and a portion of the bushing, said bearing-shield being provided with an inwardly extending annular portion engaging shoulder portion of the bushing, and a nut rotatably secured to the bushing and bearing-shield to provide a barrier against passage of foreign particles through the end of the sleeve to the bearing.
5. In apparatus of the character described, the improvement-comprising a rotatable spindle, a stationary sleeve about said spindle, said sleeve internally threaded at one end, bearing means in the end portions in the sleeve and between the sleeve and spindle, a bushing including a por-- tion extending along said spindle and a radial portion threaded into said end of the sleeve and retaining the bearing means therein, a bushing at the other end of the sleeve and including a portion fixed to and extending longitudinally of the spindle and a radially extending portion entering the sleeve and retaining the bearing means in place therein, a bearing shield at the last-mentioned end portion of said sleeve, and said shield including a cylindrical portion disposed about said end portion of the sleeve and an inwardly directed portion disposed against the Y outer side of the radially extending portion of the second-mentioned bushing and threaded to the portionpf said bushing extending longitudinally of the spindle.
6. In apparatus of the character described, the im rovement comprising a rotatable spindle, a stationary sleeve about said spindle, said sleeve internally threaded at one end, bearing means in the end portions in the sleeve and between the sleeve and spindle, a bushing including a portion extending along said spindle and a radial portion threaded into said end of the sleeve and retaining the bearing means therein. a bushing at the other end of the sleeve and including a portion fixed to and extending longitudinally of the spindle and a radially extending portion entering the sleeve and retaining the bearing means in place therein, a bearing shield at the last-mentioned end port on of said sleeve, and said shield including a cylindrical portion disposed about said end portion of the sleeve and an inwardly directed portion dis osed against the end oi the sleeve and the outer side of the radially extending portion of the second-mentioned bushing and fixed to the latter.
'7. In a paratus of the character described, the improvement comprising a vertically disposed rotatable spindle, a vertical stationary sleeve about said spindle, bearing means in the upper end portion of the sleeve and between the sleeve and said spindle, a bushing fixed to the spindle at the upper end of said sleeve, said bushing includin a portion extending longitudinally of and fixed to the spindle and a radially extending said outwardly extending 5 portion entering the sleeve and retaining the nearing means in place, a bearing shield about the upper end portion of said sleeve and said shield including a, cylindrical portion disposed about said end portion of the sleeve and an 5 inwardly directed portion disposed against the outer side of the radially extending portion of the bushing and threaded to the portion of the bushing extending longitudinally of the spindle.
IRVING 8. PRIMUS.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,339,308 Van Norman May 4, 1920 2,017,290 Parker Oct. 15, 1935 1,266,310 Pianstiehl May 14, 1918 Jung Jan. 10, 1933
US586953A 1945-04-06 1945-04-06 Bearing and seal therefor Expired - Lifetime US2419034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US586953A US2419034A (en) 1945-04-06 1945-04-06 Bearing and seal therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US586953A US2419034A (en) 1945-04-06 1945-04-06 Bearing and seal therefor

Publications (1)

Publication Number Publication Date
US2419034A true US2419034A (en) 1947-04-15

Family

ID=24347749

Family Applications (1)

Application Number Title Priority Date Filing Date
US586953A Expired - Lifetime US2419034A (en) 1945-04-06 1945-04-06 Bearing and seal therefor

Country Status (1)

Country Link
US (1) US2419034A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625578A (en) * 1970-10-12 1971-12-07 Robbins Machinery Co Guide bushing for rotary drill pipe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1266310A (en) * 1916-07-24 1918-05-14 Pfanstiehl Company Inc Support for light cutting-wheels.
US1339308A (en) * 1918-02-18 1920-05-04 Charles E Van Norman Tool-carrying spindle
US1893995A (en) * 1930-03-07 1933-01-10 Jung Karl Bearing for accurately running shafts using ball bearings
US2017290A (en) * 1934-03-03 1935-10-15 John W Parker Spindle construction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1266310A (en) * 1916-07-24 1918-05-14 Pfanstiehl Company Inc Support for light cutting-wheels.
US1339308A (en) * 1918-02-18 1920-05-04 Charles E Van Norman Tool-carrying spindle
US1893995A (en) * 1930-03-07 1933-01-10 Jung Karl Bearing for accurately running shafts using ball bearings
US2017290A (en) * 1934-03-03 1935-10-15 John W Parker Spindle construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625578A (en) * 1970-10-12 1971-12-07 Robbins Machinery Co Guide bushing for rotary drill pipe

Similar Documents

Publication Publication Date Title
US2402170A (en) Colloid mill
US3579916A (en) Polishing machine
US3110988A (en) Lapping machine
US2378070A (en) Cooling means for abrasive cutters
US2419034A (en) Bearing and seal therefor
ES410873A1 (en) Stock cleaner and method
US3247621A (en) Machine assembly
US2823496A (en) Grinding devices
US2066281A (en) Gyratory crusher
US2768595A (en) Rotatable device for cooling a part during a brazing operation
US2296564A (en) Colloid mill
US1123494A (en) Grinding-machine.
GB1050046A (en)
US3515115A (en) Lapping machine
US1553333A (en) Crushing apparatus
US2243476A (en) Food grinding mill
US2510113A (en) Machine for grinding lenses
US2946731A (en) Method and apparatus for electrolytic shaping
US2147821A (en) Colloid mill
US2175347A (en) Cooling device for machine tools
US2754693A (en) Lubricating mechanism for centrifugal separator drive
US2412677A (en) Adjustable mill unit
US2579193A (en) Mist trapping shield for lens surfacing machines
US2196058A (en) Method of and apparatus for polishing containers
US1710528A (en) Grinding wheel and holder therefor