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Publication numberUS1340120 A
Publication typeGrant
Publication dateMay 11, 1920
Filing dateMar 25, 1919
Priority dateMar 25, 1919
Publication numberUS 1340120 A, US 1340120A, US-A-1340120, US1340120 A, US1340120A
InventorsGeorge Peck Frederick
Original AssigneeJames H Malone
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Portable grinding device
US 1340120 A
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Description  (OCR text may contain errors)

F. G. P'iCK. PORTABLE GRINDING DEVICE.

1,340,120. APPLICATION FILED MAILZS. I919 May 11,

4 SHEETSSHEET Z F. G. PECK.

PORTABLE GRINDING DEVICE.

APPLICATION FILED MAR. 25. I919. 1,340,120. Patented y 11,1920.

4 SHEETSSHEET 3- //VI /1/ 701R Frazer 6. Ba]:

xrrarwzz F. G. PECK. PORTABLE GRINDING DEVICE.

1,340,120. APPLICATION FILED MAR. 15. IQIQ. ted May 11, 4 SHEETS-SHEET 4- 7 llnlu FREDERICK GEORGE PECK, OF BRADFORD, PENNSYLVANIA, ASSIGNOR, BY MEBNE ASSIGNMENTS, TO JAMES H. MALONE, OF PHILADELPHIA, PENNSYLVANIA.

PORTABLE GRINDING DEVICE.

Specification of Letters Patent.

Application filed March 25, 1919. Serial No. 285,077.

To all whom it may comm-n Be it known thatl, FREDERICK G. PEGK, a citizen of Canada, residing at the city of Bradford, in the county of McKea-n and State of Pennsylvania, have invented a certain new and useful Portable Grinding Device, of which the following is a specification.

This invention relates generally stated to devices designed for cutting screw-threads, grinding and truing screw-threads, grinding cylindrical surfaces and analogous purposes. The invention has more particular relation to a portable grinding device which among other uses may be attached to the tool holding parts of a machine, as a lathe, wherein all adjustments capable of being imparted to a tool mounted upon a particular machine, may. be imparted to such device.

The highest degree of accuracy is demanded of a device of this character and practice has dictated the uncertaintyand impracticability of such attachments for this purpose as are now upon the market. The chief difiiculty experienced has been that vibration from the driving means is referred to the shaft or spindle carrying the grinding wheel or disk. It has been sought to eliminate, without commercial success. such vibration by providing the shaft or spindle carrying the grinding wheel or disk with an interlocking vibration absorbing connection of which one part carries the driving pulley and of which the other part carries grinding wheel or disk.

I have discovered a practical and commercially successful way of preventing vibration from being referred to the shaft or spindle carrying the grinding wheel or disk of a grinding device or attachment and this may be said to constitute the leading object of the present invention.

Another difficulty experienced has been that when presenting a grinding wheel to work to be done there occurs momentarily unsuflicient or a slacking of belt-power. This is particularlytrue if a heavy cut is to be effected. I have discovered that by employment of the vibration preventing means'above referred to, I am enabled to eliminate this dis-advantageous feature and provide for automatically regulating the frictional engagement of a belt with its driving pulley which constitutes another object of the present invention.

Other and further objects relate to the construction of the device or attachment as will hereinafter more fully appear.

\Vith these and still other objects in view, as will hereinafter appear, the invention consists of the improvements hereinafter described and finally claimed.

The nature, characteristic features and sec e of the invention will be more fully un erstood from the following description. taken in connection with the accompanying drawings forming part hereof, and in which:

Figure 1, is a top or plan view of the grinding attachment.

Fig. 2, is a view in front elevation thereof.

Fig. 3, is a view in side elevation thereof.

Fig. 4, is a fragmentary view in elevation, principally sectioned, looking from the rear in Fig. 1.

Fig. 5, is a similar view in plan, principally sectioned, looking from the rear in Fi 2,

ig. 6, is a similar view in section of parts shown in Fig. 3, and

Fig. 7, is a view in side elevation of the grinding attachment provided with a slightly diflerent form of tension transmismen.

For the purpose of illustrating my inven tion, I have shown in the accompanying drawings forms thereof which are at present preferred by me, since the same have been found in practice to give satisfactory andreliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my Patented May 11. 1920.

' are provided the nut 17 so accuracy may be had when adjusting the block 16. To clamp the block in adjusted position screws 19 are employed. So mounted upon the front face of the block 16 as to be capable of being adjusted in an arc of a circle is a plate 20 the front of which is mortised as at 21. To secure the proper adjustment of plate 20, use is made of a stud having an annular bearing-face 22 and a pair of threaded extensions 23 and 24- ot reduced diameter. The part 22 is rotatably seated in block 16, the threaded extension 23 engaging a tapped portion of the plate 20 and the threaded extension 24 being engaged. by a nut for clamping the plate in fixed position against the block 16 after proper adjust ment has been secured. The part 22 is provided with a graduated disk 22 so accui.

racy may be had when adjusting the plate 20. Adjustable endwise through the mortised portion of the plate 20 is a member 25 provided with tenons for cooperatively engaging the said mortised plate. This member terminates in a tubular portion 25' which may be termed a spindle h using which housing is cut away as at 26 to form a u shaped opening to accommodate a grooved pulley 27 to be presently described. Rotatably positioned with respect to the spindle housing is an adjusting screw 28, see Fig. 5, the threaded end of which engages the tapped portion 29 of plate 20* whereby endwise adjustment of member 25 may be effected with respect to plate 20. The screw 28 is provided with graduations 28 so accuracy may be had when adjustin member 25. thrust bearings 30, supported in the spindle housing 25' is a spindle or shaft 31 to which is removably secured the grooved pulley 27. and a grinding wheel or disk 32. The spindle is provided with a screw-threaded extension 33 see Fig. '5, to receive an internally screw-threaded stem 34.- which in turn removably supports, by means of a screw 35 in engagement with the screw-threads of stem 34, the grindin Wheel or disk 32 which is made of carborun um. Such adjustments of the ball bearings with respect to the spindle as are necessary are made by means of disk 36 and 36' which have screw-threaded relation with spindle housing 25' as clearly shown in Fig. 5.

The means employed fordriving the spin- Rotatably mounted 1n en dle or shaft 31 comprises an electric motor 37 which is mounted directly upon the spindle housing 25' and is operatively connected with respect to the grooved pulley 27 by means of a tension transmission. As shown in Figs. 2 and 3 the motor 37 is supported upon a standard 33 which is clamped as at 39 to the spindle housing. By such construction several motors may be supplied with the device so that interchangeable motors are provided for. The motor-shaft 40 has removably secured thereto a grooved pulley 41., the grooves being annular in character and three in number, practice having demonstrated that this number of grooves desirable. The pulley 27 which is mounted upon the spindle or shaft 31 in similar in construction to pulley 41 except that it is provided with an additional groove, the pulley being made a little longer 5 for this purpose. The pulleys are removable so that pulleys of varied diameter may be substituted to obtain various speed ratios when desired. The pulleys 4-1 and 27 which are of relatively small diameter, are so disposed that the grooves of pulley 4]. are in alinement with three of the grooves of pulley 27 and the horizontal axes of the motor-shaft and spindle 31 are in alinement. Pivoted as at 42 to a support 43 carried by the motor casing is a substantially h0rizon tally disposed arm 44 under spring tension, as at 45. As shown in Figs. 1, 2 and 3 this arm rotatably carries at its free end a pulley 16 of relatively large diameter having a single, annular groove. The horizontal axis of the pulley 46 is in a plane intersecting the plane of the axes of the motor shaft and spindle 31 as is clearly shown in Fig. 1. (onnecting the three grooved pul leys is an endless belt 47 of which three runs of the belt are accommodated by the grooved pulleys 27 and 40 and the fourth run of the belt is accommodated by the pulley 46. However, I have discovered that, while a single pulley of relatively large diameter is eflicient in the obtaining of proper belt tension, there are times when such a pulley is not practical. This is par ticularly true when interchangeable motors are employed. In such cases it becomes necessary at times, to employ upon the motor shaft 40 a pulley of large diameter in order to secure a proper ratio of speed of the spindle 31. Frequently the motor pulley is of such diameter as to interfere with the pulley 46. Thus, for general use I prefer to employ the form of tension device shown in Fi 7. Rigidly fixed to the forward end o arm 44 as at 44: is a horizontall disposed cross-piece 48. The crossiece 1s hor1zonta1ly slotted as at 49-50. ounted in said slots for adjustable movement toward or away from the arm 4.4: are pulleys 51-52 of relatively small diameter. By

HIT:

this feature the pulleys may be properly positioned to accommodate a belt 47. Also a pulley 41 of relatively lair e diameter may be applied to a motor sha t without int-erfering with the pulleys 51-52i y the above described arrangements proper belt-tension is taken care of automatically so that spindle 31 is given sefficient belt-power at all times particularly when introducing the grinding wheel to Work and when heavy cuts are to be efffected. Also perfect alinement of the *ulley parts is insured at all times regar less of adjustments to secure various spindle locations and a total absence of vibration upon the spindle or shaft 3i is noted since all vibration as would ordinarily be referred to said spindle is taken 11 by the tension transmission. As to possi le spindle locations it will be understood that the spindle housing, which carries the spindle and motor including the tension transmis sion ma be adjusted vertically, horizontally an in an arc of a circle. By the adjustment upon an arc of a circle the spindle end which carries the grinding. wheel or disk may be tilted above and below its normal, horizontal position.

t is sometimes desirable to practice upri ht surface grinding upon a milling machine having an overhead shaft. In such case the grinding device of the invention may be more readily and expeditiously clamped to place upon the milling machine by providing the base 10 of the device with a longitudinally disposed V-shaped slot 10 upon its upper face.

Adapted for detachable connection to plate 20 is a disk-facing or truing device. This device comprises generally stated a tool support and an adjustable holder 54 or receiving a diamond By means of this device the grinding wheel or disk 32 may be accurately dressed.

It will now be apparent that I have do vised a novel and useful construction which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description and while I have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

What I claim is 1. A device of the character stated comprising a rotatable spindle provided with a grinding-wheel, a member in which said spindle rotates, a motor supported by said members, groox'ed pulleys fixed to said spindle and to the shaft of said motor, a pivetail supported arm under spring tension,

grinding-Wheel, a grooved pulley fined t6 said spindle,ameinber in which said spindle rotates, a motor supported by said memher, a grooved pulley fixed to the shaft of said motor, an arm under spring tension pivotally supported upon said motor, at least one grooved pulley operatively carried by said arm, the face of such pulley being in a plane parallel with the said pivotal connection, an endless belt the runs of which pass around the said pulleys and means for adjustablv moving said member in a direction paralleling the axis of said spindle.

3. A device of the character stated comprising a rotatable spindle provided with a grinding-wheel, a grooved pulley fixed to said spindle, a member in which said spindle rotates, a motor supported by said member, a grooved pulley fixed to the shaft of said motor, an arm under spring tension pivotally supported upon said. motor, at least one grooved pulley operatively carried by said arm, the face of such pulley being in a plane parallel with the said pivotal connection, an endless bolt the runs of which pass around the said pulleys, means for adjustably moving said member in a direction paralleling the axis of said spindle and means for adjustably moving said member in a direction at right angles to the axis of said spindle.

4. A device of the character stated comprising a rotatable spindle provided with a grinding-wheel, a grooved pulley fixed to said spindle, a member in which said spindle rotates, a motor supported by said memher, a grooved pulley fixed to the shaft of said motor, an arm under spring tension pivotally supported upon said motor, at least one grooved pulley operatively carried by said arm. the face of such pulley being in a plane parallel with the said pivotal connection, an endless bolt. the runs of which pass around the said pulleys, means for adjustably moving said member in a direction paralleling the axis of said spindle; means for :uljustably moving said member in a direction at right angles to the axis of said spindle and means for adjustably oscillating said member upon an axis at right angles to the axis of said spindle.

5. A device of the character stated comprising a rotatable spindle provided with a grinding-Wheel. a grooved pulley fixed to said spindle, a member in which said spindle rotates, a motor supported by said member which motor is provided with a shaft the axis of which parallels the axis of the spindle, a grooved pulley fixed to said motor shaft, an arm under spring tension pivotally supported upon said motor, a cross-piece fixed to said arm, grooved pulleys journaled to said cross-piece and an endless belt passing around the respective pulleys.

6. A device of the character stated comprising a rotatable spindle provided with a grinding wheel, a pulley having a plurality of grooves fixed to said spindle, a member in which said spindle rotates, a motor supported by said member which motor is provided with a shaft the axis of which parallels the axis of the spindle, a pulley having a plurality of grooves fixed to said shaft, an arm under spring tension pivotally supported upon said motor, a crosspiece fixed to said arm, pulleys each having a single groove journaled to said crosspiece and an endless belt the runs of which first pass around the plurality of grooves of the motor shaft and spindle pulleys and thence around the single groove of the remaining pulleys.

7. A device of the character stat-ed comprising a rotatable spindle provided with a grinding wheel, a grooved pulley fixed to said spindle, a member in which said spindle rotates, a motor supported by said memher, a grooved pulley fixed to the motor shaft, an arm under spring tension, a crosspiece fixed to said arm, grooved pulleys ad justably mounted upon said cross-piece and an endless bolt the runs of which pass around the respective pulleys.

8. A device of the character stated comprising a rotatable spindle provided with a grinding wheel, a grooved pulley fixed to said spindle, a member in which said spindle rotates, a motor supported by said member, a grooved pulley fixed to the motor shaft, an arm under spring tension, a crosspiece fixed to said arm said cross-piece being slotted, grooved pulleys adjustably mounted in said slots and an endless belt the runs of which pass around the respective pulleys.

9. A device of the character stated comprising a rotatable spindle provided with a grinding wheel, a grooved pulley fixed to said spindle, a member in which said spindle rotates, a motor supported by said member, a grooved pulley fixed to the motor shaft, an arm under spring tension pivotally carried upon said motor, a horizontally disposed cross piece fixed to the free end of said arm said cross piece being slotted, grooved pulleys journaled in said slots and adjustable toward or away from said arm and an endless belt the runs of which pass around the respective pulleys.

10. A device of the character stated comprising a rotatable spindle provided with a grinding wheel, a member in which said spindle rotates, a motor supported b said member, grooved pulleys fixed to sai spindle and to the shaft of said motor, a sup port mounted upon said motor,"an arm under spring tension, a grooved pulley carried by said arm, a pivot pin for securing said arm with respect to said support said pivot pin passing through said arm in a plane parallel with the face of the groovedpulley of said arm and'an endless belt the runs of which pass around said pulleys; 7

In testimony whereof, I have hereunto signed my name.

FREDERICK GEORGE P 13011.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2603062 *Sep 30, 1949Jul 15, 1952Westinghouse Electric CorpVariable area jet nozzle
US6141947 *Jun 4, 1999Nov 7, 2000Mtd Products IncDynamic drive and brake system
US6220006Jul 27, 2000Apr 24, 2001Mto Products IncDynamic drive and brake system
US6484482Apr 4, 2001Nov 26, 2002Mtd Products IncDynamic drive and brake system
WO1999062322A1 *Jun 4, 1999Dec 9, 1999Mtd Products IncDynamic drive and brake system
Classifications
U.S. Classification474/68, 451/311, 451/294, 451/344, 474/134, 474/135
International ClassificationF16H7/12, F16H7/08
Cooperative ClassificationF16H7/1281, F16H2007/088, F16H2007/0802
European ClassificationF16H7/12N4