US2503392A - Point locating and marking device for laying out machine work - Google Patents

Description

Apnl 11, 1950 F. F. KREIPL 2,503,392

POINT LOCATING AND MARKING DEVICE FOR LAYING ou'r MACHINE WORK Filed Jan. 24, 1945 s Sheets-Sheet 1 INVENTOR. 59:0 flea/P4,

Arron/van 5 Sheets-Sheet 2 F. POINT LOCATING FOR LAYING OUT MACHINE WORK pril 11, 1950 Filed Jan; 24, 1945 4 INVENTOR. F7450 E/f/PE/PL,

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Apnl 11, 1950 F. F. KREIPL 2,503,392

POINT LOCATING AND MARKING DEVICE FOR LAYING OUT MACHINE WORK 1 Filed Jan. 24, 1945 3 Sheets-Sheet 3 Patented Apr. 11, 1950 POINT LOCATING AND MARKING DEVICE FOR LAYING ()UT NIACHINE WORK Fred. F. Kreipl, Los Angeles, Calif.

Application January 24, 1945, Serial No. 574,417 7 My invention relates generally to devices for locating a point on a workpiece, and more particularly, to the location of points for marking, drilling, reaming, and other operations to be performed on the workpiece.

One of the major objects of my invention is to vprovide a device or tool which will both locate a point on the workpiece, and guide the tool which is to perform the work on the piece, thereby increasing the usefulness of such appliances.

Another object of my invention is the provision of a locating device which makes it possible to locate desired points on a workpiece with greater accuracy and rapidity than heretofore .possible.

A further object of my invention is to provide means which can be used for center punching preparatory to drilling, reaming, tapping, facing, and other types of drill press work.

Another object is to provide auxiliary means for marking out a cam line, point by point, in a more rapid and efficient manner than is possible with other apparatus of this type.

These and other objects and advantages of my device will become apparent from the following description of a preferred form thereof, and from the accompanying drawings, in which:

Fig. 1 is a plan view of a preferred form of my device;

Fig. 2 is a front elevational view of said device;

Fig. 3 is an end elevational view of the same;

Fig. 4 is a vertical longitudinal section taken on the line 4@ of Fig. 1;

Fig. 5 is a vertical transverse section taken on the line 55 of Fig. l;

Fig. 6 is a vertical section taken on the line 66. in Fig. 1;

Fig. 7 is an elevational view partially in section of a modified form of tool-holding bridge;

Fig. 8- is a plan view of an auxiliary attachment to be used in marking out cams;

Fig. 9 is a vertical sectional view taken on the line 99 of Fig. 8

Fig. 1015 a partial vertical section taken on the line Ill-All of Fig.8; and

Fig. 11 is a diagrammatic view illustrating the use of the attachment of Figs. 8 to 10 in the laying out of the cam.

Referring now to the drawings, and more particularly to Figs. 1 and 2 thereof, the numeral l indicates a base which is provided with fiat top,

or table, la, and with two parallel longitudinally extending rods or shafts 2 and 3 on opposite sides of the table upon which atransverse carriage 4 is slidably mounted. The carriage 4 in turn it Claims. (c1. 33-.189)f carries upper and lower parallel rods 5 and 6, 55

, 2 I respectively, as seen best in Fig. 5, on which a locating member 23is slidably mounted for trans verse movement across the :table la. The locat ing member 23 is provided with accurately machined right-angled vertical Walls 43 and 44, as best seen in Figs. 1 and 4, these walls being adapted to receive-corresponding faces of a workpiece placed thereagainst. The position of the walls 43 and M longitudinally is controlled by movement of the carriage l lengthwise of the table la and transversely by movement of the locating member 23 on the carriage, as will be discussed-in more detail hereinafter. The table l a is provided with intersecting scales A and B at right anglesto each other, each scale starting from zero at its point of intersection with the other, as seen best in Fig. 1, and running progressively with suitable increments, such as, for example, one inch, from zero up to the size of work which the machine is to accommodate.

These scales are for the purpose of facilitating the location of the locating member 23 with respect to the zero point.

The tablela is provided with a centrally located longitudinal-groove or slot ll extending from one side of the base (the right side in Fig. 1) to a point adjacent the other side of the base. Rotatably mounted in slot ll is a shaft l9 supported at its inner end by the end wall of the slot I1, and at its outer end in a threaded bushing I8, as seen best in Fig. 4. The outer end of shaft I9 is threaded to correspond with the threads in bushing [8 so that rotation of the shaft will cause axial or longitudinalmovement thereof, the shaft being provided with a hand wheel 28 at its outer end, and a dial 2| for indicating the rotational positionof the shaft with respect to a sight bar '22. The shaft I9 is provided with a series of annular grooves spaced along its length at fixed intervals corresponding to the scale B marked off on the table la, preferably one inch divisions. These recesses or annular'grooves are designated by the numeral i911, as seen best in Fig. 4.

The carriage dis provided with a bore 1 in the vertical plane of shaft 19 in which are located upper and lower bushings 3 and 9, respectively, in which a pin lll is vertically slidable. The lower end ll of pin I0 is preferably complemental in size and shape to the annular grooves l9a of shaft l9 so that pin Ill may be lowered into one of the grooves to snugly engage the same. The upper end of pin it is provided with a bore 12 which receives a helical spring it which is held in place by means of a plate #4 to normally urge the pin i0 downwardly ,into engagement with the shaft IS. A lever l pivotally mounted at l6 on the carriage 4 has itsinner end extending into the bore 1 and engaging the pin so that the pin may be raised out of engagement with shaft l9 by depression of the lever l5. It will thus be apparent that whenever the carriage 4 is located so that the pin I0 is immediately above one of the grooves i911, the spring l3 will force the pin into engagement with the groove to thereby hold the carriage against longitudinal movement along the table la. However, because of this engagement between pin Ill and a groove [90, rotation of shaft 19 and consequent longitudinal movement thereof will cause corresponding iongitm dinal movement of carriage 4. v

As previousl mentioned, the locating member 23 with its vertical walls 43 and is transversely movable along rods 5 and 6 in the same manner that the carriage 4 is slidable along its supportin rods 2 and 3. Locating member 23 is provided with a horizontal bore 24 in which a pin 25, similar to pin in, is 'slidably mounted, the pin 25 being normally urged inwardly (to the right, as seen Fig- 6) by a s ring 246 which is held in a hole in the outer end of pin 25 by a cover plate 2511. The carriage 4 is provided with a horizontally disposed shaft 21 located substantially midway between the horizontal shafts 5 and 6 and provided with a series of annular grooves no similar to the annular grooves 19a in shaft 18-. The shaft 2"! and pin 25 are in the same horizont'al plane so that the pin 25 is urged into engagement with shaft 21 by means of the spring 24a. the inner end of 'pin 25 being shaped to complementa ly engage the grooves 21a, The outer end of shaft 21 threadedly engages a bushing 88 and provided with a hand wheel 28 having a circular scale 25 thereon, rotation of the wheel and shaft causing longitudinal movement thereof in the same manner as shaft l9. The other end of shaft 2 is provided with a cavity 3| in which is located a com ression spring 32 held in place by a cover plate 33 which causes it to continually urge the shaft 21 to the right in Fig. 5, thereby taking up any play inthe threads of bushing 88.

It will be understood, of course, that similar spring means may be rovided for shaft 1'9 to eliminate any ossibilit of play in it's threaded connection with bush'ing l8; however, in the intere'st of sim licity this has not been illustrated in the drawing. lit will be understood that the pin 25 is normally urged to engage the "shaft 21 and when it is opposite a groove 221a, will engage the groove so that rotation of shaft 2": with consequent axial movement thereof will cause cor responding linear motion of locating member 23 transversel of the table la; A lever 26 pivoted on the locating ember at 261: has its inner" end enga in the pin 25 to move the pin outwardly in res onse to jin'o'vemehtoi the lever, to thereby disengage it with shaft 21 in the same mariner that movement of lever I5 diserigage's pin in from shaft l9. I

The dial 2| is preferably divided into one hundr'ed equa1 parts correlated with the threads of shaft is so that each of the hand wheel will coincide with one hundred major division's on dial 2!, thus moving the bar is exactly 1 inch. It will be understood, oi course, that any suitable correlation can be used between the trial and the threads of the shaft. A similar arrangement may be provided for dial 2!! and threads or shaft 21 to provide similar accuracy.

The base I is provided with a pair or upstanding posts 34 which are prererabiy'looated at opposite corners of the base at the end adjacent the zero point of the scales A and B. A horizontal bridge 35 is mounted on the posts 34 for vertical movement thereon, its inner portion being provided with a vertical hole 36 in which a center punch 31 is slidably mounted, as seen best in Fig. 4. A helical spring 40 normally bears against a pin 52 on the upper end of the center punch 31 to normally ur e the unch upwardl out of eng'agement with the table la. A lever 38 pivotally supported on the bridge at 39 engages the upper end of center punch 31 and is adapted to force the punch downwardly against the action of the spring 40. The lower end of the center punch is provided with a horizontal pin 4| which rides in a slot 42 in the lower end of the hole 36 to arrest upward movement of the punch after the punch point has been retracted into the bore 36 to thereby protect the point against damage.

In the operation of my device for marking a point on a fiat workpiece, the locating means 23 is accurately positioned with respect to the center punch 31 so that by laying the workpiece up against the vertical walls 43 and 44 of the locating member, exactly the correct point to be marked will fall underneath the punch 31. In other words, instead of locating a point by measuring across the workpiece, the locating member 23 is positioned so that by merely placing two faces of the workpiece against the proper guide walls of the locator, the place may be automatically punched. For example, in the case of a work iece having right angled faces, if it is desired to locate a mark 2.375" from the right edge of the workpiece and .075 from the rear edge thereof, as it would be laid out on the table la in Fig. l, the locking pin 10 is disengaged from shaft l9 and the carriage 4 is moved along the table (to the left in Figs. 1 and 4) to a position where the guide wall 43 of locating member 23 will line up with the two inch line of its corresponding scale. The lever i5 is then released and the pin It is urged into engagement with the annular groove i911 corresponding to the two inch mark onscale B to thereby lock the carriage and shaft i9 together. Hand wheel 20 is then rotated three full turns plus divisions on the scale until the '75 mark on the dial '2! is aligned with the sight 22, at which point it will be known that the shaft l9 and carriage 4 have been moved to the right exactly .375" from the two inch scale line. We thus know that guide wall 43 is positioned exactly 2.375 inches from the zero line of its scale and from center punch 31.

The other distance to be located is obtained by moving lever 26 to disengage pin 25 from grooved "shaft 21 and moving the locating member 23 transversely across the table until the wall 44 is aligned with the zero line of its scale. The handle 26 is then released, allowing the spring 2521 to force the pin 25 into engagement with the zero groove of shaft 21, thereby locking the locating member and the shaft together. The hand wheel 28 is then turned to align the numeral 75 on dial 29 with the sight 22, thus moving the shaft 2''! and looa'tor 23 ;075 inch from the zero line, which means that the guide wall 43 is now located .075 inch from the zero line and punch 31.

The workpiece can now be placed on the table with its appropriate edges firmly pressed against vertical walls 43 and 14 which will cause the desired point on the workpiece to be located immediately under the punch '31 which may now be operated by depressing the handle 38 t0 Inatk the workpiece.

It will be understood that any suitable ineans can be utilized for holding the workpiece securely to the table during the marking operation, such as, for example; a magnetic chuck placed beneath .the table Ia or other suitable means. The carriage 4 and locating member 23 may be locked in position by any suitabl means, such, for example, as set screws and 45, respectively. The dials 2i and 29 are preferably adjustably arranged so that they may be set at zero before the locating operation is performed.

In the marking operation, the bridge 35 is preferably moved downwardly after the workpiece has been placed on the table until the surface 41 is immediately adjacent the upper surface of the workpiece, whereupon the bridge is secured in position by suitable clamping means, such, for example, as set screw 48. To prevent the bridge 35 from being moved down too far, I provide spacing sleeves 49 on posts 34 which protect the surface 41 from being struck against the table.

It is to be understood that while this device has been described primarily as a marking or laying-out tool, that its scope may be considerably enlarged by the use of certain auxiliary parts such as units for drilling, reaming, countersinking, center boring, etc., and also by the use of other attachments which adapt the device for a particular job.

In case it is desired to use the device as a drill jig, the bridge 35 may be modified or replaced by a bridge such as illustrated by the numeral in Fig. '7, which is slidably mounted on post 34 as before. In this case, however, the bridge carries a drill guide bushing 5! adapted to accurately guide a drill mounted adjacent thereto in any convenient manner, so that instead of merely center punching the work, a hole can be drilled while the work is in place on the table. Other suitable modifications of bridge 35 will be apparent to those skilled in the art.

Referring now to Figs. 8-11, inclusive, which illustrate a cam marking attachment which can be used in conjunction with the apparatus previously described, the numeral 53 indicates a fiat body member having two side walls 84 and 85 perpendicular to each other, and provided with smooth plane faces so that they can be accurately placed against the locating Walls 43 and 44 previously described. The body 53 is provided with a centrally disposed upstanding stud 51' which is rotatably mounted in a bushing 50 secured within a vertical bore in the body 53. Secured to the stud 5? for rotation therewith is a circular dial plate 54 which. rests on the upper face of body 53 and which has scale graduations on its circumference from zero to 360. Secured to the upper face of dial 54 and to the stud 5'! is a plate 56 which protects the dial plate and also acts as a work table as hereinafter described. It will be noted that the upper and lower ends of the stud 51 are reduced at 58 and 59, respectively, and that the lower end or the stud is provided with a washer 52 and a nut 63 which serve as a seat for a spiral spring 51 held between the washer 62 and the shoulder of a counterbore whereby the stud 57 is urged downwardly to provide frictional engagement between dial 54 and the upper face of body 53. A sight extension with a sight mark is provided on the front of body 53 to facilitate reading the scale of dial 54.

The dial 54 is provided on its under side with aseries of conical indentations 54 preferably spaced'at five degree intervals around the dial directly under the five degree division marks thereof. An insert 12 is placed in a cut-out por tion in the forward portion of body 53 which is slotted to receive a vertically movable pin operated by a lever 61 extending through an aperture 59 in the pin and pivoted on the insert at a point 68. The lower end of the pin 65 is bored and provided with a compression spring 10 which is held in place by a base plate H. i

The pin 55 is positioned so that it will be aligned with the indentation 64 in the lower face of dial 54, and in response to the urging of spring 10, will seat in said indentation when the corresponding scale division is aligned with the sight 55. Depression of the lever 61 moves the pin 65 downwardly to disengage it from said indentations and permit rotation of the dial 54 and plate 56.

To permit frictional rotation and accurate adjustment of the scale between the five degree intervals, I provide an auxiliary frictional brake mechanism seen best in Figs. 8 and 10, wherein it will be noted that a generally L-shaped bracket 13 is secured to the body 53 and has a horizontal stud 14 mounted in its upstanding portion. A brake shoe i5 is carried on the inner end of stud l4 and is urged away from bracket 13 into engagement with the periphery of plate 56 by a coil spring 15. The stud 14 has a square head 11 thereon seating in a cavity in brake shoe I6 and preventing rotation of the stud 14 which is provided with threads on its outer end .upOn which is screwed a handle 18, rotation of which causes stud M to move axially. The brake shoe '6 is additionally supported and guided by a horizontal pin 79 which is pressed into the brake shoe I6 and slidably mounted in a bore in bracket 13, as seen best in Fig. 8. It will thus be seen that rotation of the nut 18 will move the shaft 14 inwardly or outwardly as desired to cause or release frictional pressure between brake shoe l5 and plate 56.

In laying out a cam with my apparatus, a drawing is preferably first made of the cam to facilitate reducing the dimensions of the cam to radial and angular dimensions as illustrated in Fig. 11 wherein a cam is illustrated which has a dwell of one-inch radius through the first 153, then a rising portion of variable shape to a maximum of 1.42 inches, and then a portion decreasing in diameter to the zero point. After all of the necessary radial and angular dimensions have been computed or plotted, the plate material indicated by the numeral 8! of which the cam or its template is to be made, and provided with a hole 82, is slipped over the upper end of the stud 57 so as to rest on plate 56. A nut 83 is then screwed down onto the stud '51 to hold the plate 8| firmly to the plate 56. The dial 54 is then set 1 with its zero line aligned with the reference line 55, and the attachment is ready for mounting on the table of the device shown in Figs. 1-6.

Assuming that the distance of face 84 of body 53 is exactly three inches from the axis 86 of the dial 54, the locating member 4 is moved so that the locating wall 43 (see Fig. 1) is brought to the three-inch line of scale B, and set screw 46 is tightened to lock the carriage in this position. The cam attachmentbody 53 is then positioned in the apex of the locator 23 with its walls 84 and 35 held against guide walls 43 and 44 by suitable means such as a magnetic chuck or the like. In this position the axis 86 of the cam attach,- ment is aligned with the zero line of scale B,-in which position it remains throughout the operation of laying out-the cam. Assuming the hyth dwell has a one-inch radius commencing at

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