US1969738A

US1969738A - Reforming last

Info

Publication number: US1969738A
Application number: US638541A
Authority: US
Inventors: Fitzpatrick Jeremiah
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-10-19
Filing date: 1932-10-19
Publication date: 1934-08-14
Anticipated expiration: 1951-08-14

Description

1934- J. FITZPATRICK 1,969,733

REFORMING LAST Filed Oct. 19, 1932 3 Sheets-Sheet 2 Flg- 5- 5 TIQFB- I l I II,

. INVEN+E1RZ 3151- JEREMIAH FITZPATR 13 ALM- a.a;

Patented Aug. 14, 1934 UNITED STATES PATENT OFFICE Claims.

This invention relates to reforming old lasts to produce lasts conforming to new specifications.

' In order to reform old lasts to conform to a 5 new 'or model last it is necessary that the old last be mounted in the last turning machine on the same axis as the model last, and it is desirable also that'this axis be, in so far as possible, the original axis around which the old lasts were formed. The accurate location of the new axis upon which the old lasts are to be reformed has heretofore been difficult to accom plish inasmuch as it has been dependent upon measurements taken from the exterior of the lasts. Such measurements have not been dependable because lasts do not maintain the shapes originally given them due to swelling or shrinking caused by changes in temperature and moisture usage.

It is an object of the present invention to overcome these difliiculties and provide a commercially practical method of locating the axes of lasts.

Another object of the invention is .the provision of an improved methodi of reforming lasts;

A further obj'e'ct of the invention is the provision of suitable apparatus for accurately locating the axis upon which a. last may be reformed.

The invention will be more clearl; understood from the following description in conjunction with the accompanying drawings, in which:

Fig. l-is a front elevation partly in section of a machine for performing one step in the process of locating the axis of a last to be reformed.

Fig. 2 is a plan view of the same;

Fig. 3 is a section taken on the line 3-3 of Fig. 1;

Figs. 4 and 5 are views similar to Fig. 1 showing ,the parts in a different position;

Fig. 6 is a front elevation of a machine for performing the second step in the process of locating the axis of the last to be reformed;

Fig. 7 is a front elevation of a machine for performing the third step in-the' process of locating the axis of the last to be reformed; and

Fig. 8 is a. section taken on the line8-8 of Fi 7;

Before explaining in detail the present invention it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and conditions and due, also, to deformities caused by" vice and for this purpose is provided with up- Fig. 1. This machine comprises a frame 10 having a suitable way 11 in which a carriage 12 is slidably mounted. The rear end of the carriage 12 is provided with an upright 13 having a slot 14 through which a wedge block 15 may be inserted upon the bed of the carriage. ,The upper 7 end of the upright 13' is provided with an enlargement having a V-shaped recess 16 in its front surfaceadapted to receive the heel part of a last. A plate 17 is suitably secured upon the top of the upright 13 by screws 19 and projects beyond the front edge of the V-block 16 and is provided at its front end with a cut away portion A front upright 20 is slidably mounted in a suitable way 21 in the bed of the carriage 12. The upright 20 is provided at its upper end with an enlargement having a V-shaped recess 23 in its rear face adapted to receive the toe portion of a last. The upright 20 is also provided near its lower end with a rearwardly extending projection 25 having an opening 26 to receive an adjustable support in the form of a screw 27 having a knurled head 28. A nut 29 is threaded upon the lower end of the screw 27 and is slidably mounted in a suitable way 30 in the projection 25. The support 27 is urged upwardly by a spring 31 surrounding the screw and extending between the knurled head 28 and the top of the enlargement 25. The position of the upright 20 is adjusted upon the carriage 12 by ashaft 33 having threaded engagement with a lug 34 extending upwardly from the carriage12. The shaft 33 is rotatably mounted in a suitable bearing in the upright 20 and is providedfwith collars 35 and 36 engaging the front and rear faces of the upright 20 to prevent axial movement of the shaft 33 relative to the upright. The shaft 33 is rotated by a handle 33'.

The carriage 12 also carries a last grading derights 37 extending from opposite sides of the carriage intermediate the ends thereof. One of the uprights 37 is provided with a hole 37' (Fig. 3)

for movably guiding a prick punch 38 so that it may be moved into engagement with the side of a 1.10

between the uprights 37 and is provided with depending portions 40 at each end thereof and adjacent the outer faces of the uprights 37. The

lower ends of the depending portions 40 each are provided with an inwardly extending tongue 41 (Fig. 3) adapted to engage inclined guideways 42 in the outer faces of the uprights 37. The

\ cross member 39 is provided with an opening to receive a bushing 43 through which projects a chine.

drill 44 which is mounted on the frame 10 for axial and rotative movement. The cross member 39 is also provided with a threaded opening adapted to receive a screw 45. A pin 46 extends through the cross member 39 near each end thereof and is adapted to engage one of a plurality of holes 47 formed in the top of the uprights 37.

A screw 50 is mounted in a predetermined position in the upright 20 so that its point 51 extends into the V-shaped recess 23. The position of the screw 50 in the upright 20 is determined in the following manner. A standard last is selected, for convenience, a standard size 7C. This last is then placed in the machine of Fig. 1 with the heel part in the V-shaped recess 16 with the extreme rear portion of the bottom of the heel part engaging the bottomsurface of the plate 1'7, and with the fore part in the V-shapedrecess 23 with the toe portion of the fore part resting upon the support 27, and the last is held in this position by inserting the wedge block 15 into clamping-engagement with the last. A point is then selected at the back of the heel of the last that lies about 1%" from the bottom of the heel which in the norma1 standard size 7--C last lies about midway between the top and bottom of the last. A second point is selected at the toe end of the last where the toe surfaces intersect. It has been found that a line drawn between these points coincides with or closely approximates the position of the axis upon which the last was originally turned, and

this line will be referred to hereinafter as the right 3'7 so that the axis of the prick punch 38 is in the horizontal plane of the axis of the screw 50 and so that the extension of the axis of the prick punch'intersects the extension of the axis of the drill 44. It will be noted that the positioning v of the last in the V-

shaped recesses

16 and 23 isfor' the purpose of alining the axis of the last with the axis of the screw 50 as viewed in plan. j

To calibrate the grading device the carriage 12 is moved to bring the ball of the tread of the last directly beneath the drill 44. The screw 45 is then brought into engagement with the tread of the last. The wedge block 15 is now inserted through the opening '14 in the upright 13 and forced into engagement with the heel part of the last so as to clamp the last to the plate 17. With the cross member 39 in this position a bore 47 is formed in the top of each of the uprights 37 to receive the pins'46 and lock the cross member in the position it must occupy to position a standard '70 last with its axishorizontal.

The standard '70 last is then removed and the upright 20 moved relative to the carriage so that a last of different size may be placed in the ma- For example, a standard 11C last is placed in the machine as shown in Fig. 4 with the bottom of the heel engaging the plate 1'7 and with the toe resting upon the support 27 and with the V-

shaped recesses

16 and 23 engaging the heel and toe respectively. With the parts in this position the point of intersection of the toe surfaces is below the axis of the screw 50 due partly to an increase in toe spring (toe spring increases for each size) and partly to the fact that the last now engages the screw 45 at a point farther back on the tread. The carriage 12 is then moved to bring the ball of the tread of the last below the drill 44 as shown in Fig. 5 and this causes the cross member 39, which is held from traveling with the carriage 12 by the drill 44, to rise due to its mounting upon the inclined ways 42 on the uprights 37 of the carriage. When the carriage is thus positioned the intersection of the toe surfaces of the last will be positioned opposite the point 51 of the screw 50. Another hole 4'7 is then made in the top of each upright 37 which designates the position of the carriage for a size 11 last. The remaining openings 4'7 are then formed in the top of the uprights 3'1 by positioning other standard lasts of C width throughout the range of mens sizes in the machine of Fig. 1 in the same manner as the standard 7C and 11C were positioned as just described with the ball of the tread directly beneath the drill 44. As each of the standard lasts of the various sizes is so positioned in the machine an opening 4'7 is bored in the top of each upright 3'7 to receive one of the pins 46. Thus when any size last is placed in the machine and'the carriage adjusted to the position corresponding to that size last, the axis of the last will be perpendicular to the drill 44 or a hole 52 formed thereby inthe tread of the last. The hole 52 assists in positioning the last properly in other machines for performing the remaining steps in the operation of locating the axis upon which the last is to be reformed.

A machine for performing the second step of the operation for locating the axis upon which the last isto be reformed is illustrated in Fig. 6 and comprises a frame 55 having an overhanging arm 56 provided with an opening to receive a bushing 5'7 in which a drill 58 is rotatable and axially movable. The frame 55 is provided with a suitable way 59 in which wedge blocks 60 and 61, are slidably mounted. The wedge blocks 60 and 61 are movable toward and away from the axis of the drill 58 simultaneously equal amounts by a shaft 62 rotated by a handle 62 and having right and

left hand threads

63 and 64 engaging the wedge blocks 60 and 61 respectively. A pin 65 having a shoulder 53 is adjustably mounted in the wedge block 61'and is. adapted to fit in the tread end of the hole 52 in the last when the latter is positioned between the clamping blocks 60 and 61. A pin 65' is flxed in the wedge block 60 to enter the other end of the hole 52. The drill 58 is so positioned as to form a hole '66 in the side of the last intersecting the hole 52 in the ,tread of the last. The hole 66 is adapted to receive a stop pin 67 (Fig. 7)

The third step in the operation of locating the axis upon which the last is to be reformed is performed in a machine of the type shown in Fig. 7. This machine comprises a frame 70 having a drill 71 mounted therein for rotative and axial movement. Drills '72 likewise are mounted in the frame '70 for rotative and axial movement and with their respective axes equidistant from an extension of the axis of the drill 71. One or more fixed shafts 73 extending upwardly from each end of the frame '70 have slidably mounted thereon a support 74. Screws '75 in threaded engagement with the support 74 are provided with worm gears 76 which are engaged by worms 68 carried by a shaft 69 mounted in bearings in the urged resiliently towards the last positioning pin 77 by a spring 83 extending between hooks carried by the block and the block 78. The relative positions of the pin '77 to the recess 80' is the same as the relative positions of the recess 16 to the drill 44 of the machine shown in Fig. 1

as viewed in plan.

Having described the machines illustrated in Figs. 1, 6 and '7, the use of these machines in carrying out the method of the present invention will now be described.

For purpose of illustration it will be assumed that a batch of size 7-0 lasts are to be reformed by'cutting down the toe portion of the lasts. In the first place the carriage 12 (Fig. 1) is moved until the pins 46 can be inserted in the openings 47 corresponding to the size '7 last. One of the lasts is then taken and placed in the machine as shown in Fig. 1 with the bottom of the heel in engagement with the plate 1'? and the toe resting upon the support 27. The screw 45 is adjusted against the tread of the last until the intersection of the toe surfaces is brought to a point opposite the point 51 of the screw 50. The adjustment of the screw 45 is maintained by a check nut 9. The wedge block 15 is inserted in the opening 14 in the upright 13 so as to clamp the heel tightly against the plate 17. A hole 52 is then bored in the tread extending through the last or at least more than half way through the stock at this point. The punch 38 is then moved into engagement with the side of the last to make a prick mark 92 (Fig. 3). The setting of the grading device as thus established is maintained and is such as to position each of the lasts of the batch to be reformed so that the relation of the axis upon which the last is to be reformed to the hole 52 will be the same in all the lasts of the batch. I

The last is then removed from the machine and placed in the machine shown in Fig. 6 with the hole 52 engaging'the pins 65 and 65'. The pin 65 is adjusted and the screw shaft 62 actuated to cause the clamping blocks 60 and 61 to hold the last with the prick mark 92 beneath the axis of the drill 58. A bore 66 is then formed in the side of the last to intersect the hole 52. The last is then removed from the machine and the stop pin 6'? inserted in the hole 66 so as to intersect the hole 52 as shown in Fig. 7. The last is now placed in the machine shown in Fig. 7 with the hole 52 engaging the positioning pin 77 and with the heel of the last in the V-shaped recess 80 in the block 80. The support '14 is raised by actuating the shaft 69 until the intersection of the toe surfaces of the last is opposite the point of the drill 71. Bores f and b are now formed in the fore part and heel part of the lastrespectively. The setting of the support '74 as thus established is maintained and is such as to position each of the lasts of the batch to be reformed so that the relation of the free end of the positioning pin '7'! to the axis of the bores f and b or to the axis upon which the last is to be reformed will be the same in all the lasts of the batch.

The last is now removed from the machine shown in Fig. 7 and is given to the last maker who remodels the last to conform to the new specifications by cutting away the toe end portion of the last. The last is now used as a model or pattern and is inserted in the last turning lathe, the bores J and b, respectively; providing The other lasts are now taken from the lot oflasts to be reformed and are placed successively in the machines shown in Figs. 1, 6 and '7 in which the

holes

52, 66 and the bores and b are formed as above described for establishing the axis of each last and which axis will be the same as the axis of the. model last. The lasts are then successively placed in the last turning lathe and the toe end portion thereof turned down to conform with the model last. During. this operation the last will turn on the axis established by said bores and the bores provide means for such turning'in the lathe the same as with the model last.

What-I-claim is:

, 1. As a preliminary operation for preparing lasts to be reformed, the method of locating the longitudinal axis upon which the lasts are to be reformed which comprises, similarly positioning each of the lasts and forming a plurality of bores in the heel thereof so that a point equi distant from the axes of said bores coincides with the axis upon which the last is to be reformed and which axis bears a predetermined relation to a last positioning element, locating a point within the last having the same predetermined relation to said axis as does said last positioning element, supporting the last on the axis as defined by the point which is equidistant from the axes of said bores and the point within the last by engaging the bores'in the heel thereof and with said element engaging said point within the last and while the last is thus positioned forming a boring in the toe thereof.

2. As a preliminary operation for preparing lasts to be reformed, the method of locating the longitudinal axis upon which the lasts .are to be reformed which comprises, similarly positioning each of the lasts and forming a plurality of bores in the heel thereof so that a point equidistant from the axes of said bores coincides with the axis upon which the last is to be reformed and which axis bears a predetermined relation to a last positioning element, locating by intersection borings a point within the last having the same predetermined relation to said axis as the last positioning element, supporting the last on the axis as defined by the point which is equidistant from the axes of said bores and the distant from the axes of said bores coincides with the axis upon which the last is to be reformed and which axis bears a predetermined relation to a last positioning element, locating by intersecting borings a point within the last having the same predeterminedlrelation to said axis as the last positioning element, placing a stop pin in the last at said point, supporting the last on the axis as defined by the point which is equidistant from thex axes of said bores and the point within the last by engaging the bores in the heel thereof and with said element engaging said stop pinand while the last is thus positioned forming a boring inthe toe thereof.

4. As a preliminary operation for preparing lasts to be reformed, the method of locating the longitudinal axis upon which the lasts are to be reformed which comprises, similarly positioning each of the lasts and forming a plurality of bores in the heel thereof so that a point equidistant from the axes of said bores coincides with an axis extending longitudinally of the last and through the intersection of its toe surfaces and which axis bears a predetermined relation to r a last positioning element; locating a point within the last accessible through the tread'thereof having the same predetermined relation to said axis as does said last positioning element, supvthe bores in the heel thereof and with said element engaging said point within the last and while the last is thus positioned forming a boring in the toe thereof.'

5. As a preliminary operation for preparing lasts to'be reformed, the method of locating the longitudinal axis upon which the lasts are to be reformed which comprises, supporting each of the lasts in a determinate position and while thus supported forming one set of borings therein extendinglongitudinally in the heel part and another set of transversely intersecting borings in the toe part to define like :axes for all the lasts, supporting in a determinate axial position each of the lasts to be reformed by positioning elements engaging the borings in said heel and toe part, and while thus supported forming a positioning center in the forward end of the last so that it lies in definite predetermined relation to said axis.

' JEREMIAH FITZPATRICK.