US1720033A - Automatic drilling machine - Google Patents

Description

July 9, 1929. p, c u K s 1.720.033

AUTOMATIC DRILLING MACHINE Filed an- 1924 9 Sheets-Sheet l Irufenm 1%804702? Z (M12528 VIA/ T. P. CAULKINS 1.720.033

AUTOMATI C DRILLING MACHINE July 9, 1929.

Filed Jan. 8, 1924 9 Sheds-Sheet 2 fleadbre T. P. CAULKINS 1.720.033

AUTOMATIC DRILLING MACHINE Filed Jan. 8, 1924 9 Sheets-Sheet 4 July 9, 1929. T. P. CAULKINS AUTOMATIC DRILLING MACHINE Filed Jan. 8, 1924 9 Sheets-Sheet 5 July 9, 1929. r. P. CAULKINS AUTOMATIC DRILLING MACHINE Filed Jan. 8, 1924 9 Sheets-Sheet 6 Inf 2 jfieodore 2 Art 2 aw 1w y 9, 1929. V "r. P. CAULKINS 1.720.033

AUTOMATI C DRILLING MACHINE Filed Jan. 8, 1924 9 Sheets-Sheet 7 A I 91 (92 I! 4 M .T. P. CAULKINS 1.720.033

AUTOMATIC DRILLING MACHINE Filed Jan. 8, 1924 9 Sheets-Sheet s 0 aux NM qmw m Na K ma g Em J fiieoabre [auiilhs {11 July 9, 1929.

l A: =all l OT IZU July 9, 1929. T. P. CAULKINS AUTOMATIC DRILLING MACHINE 9 Sheets-Sheet 9 Filed Jan. 8, 1924 '////////lI//II//I////II(///////// 7l/l(llllllllllll /ly Tfieodore 1. (ZZMZIRS Patented July 9, 1929.

UNITED STATES THEODORE I. GAULKINS, OF CHICAGO, ILLINOIS.

AUTOMATIC DRILLING MACHINE.

Application filed January 8, 1924. Serial No. 685,007.

My invention relates generally to automatic drilling machines but relates more particularly to machines adapted to drill holes in bolts, nuts and similar articles.

The general object of my invention is to provide a drilling machine wherewith holes may be drilled rapidly, accurately and at low cost, or change the form of previously drilled holes.

Another object of my invention is to provide a drilling machine which shall automatically receive, drill and discharge the drilled articles, thus obviating the necessity of manual labor for these operations.

I aim also to provide a drilling machine which shall automatically drill holes in the work presented thereto and in which there shall be little danger of breakage of the drill due to any abnormal conditions of resistance to which the drill may be subjected.

Another object of my invention is to provide a drilling machine in which the work shall be automatically positioned, firmly held during the drilling operation thereby insuring accuracy, and finally discharged, all in a simple, safe and expeditious manner.

My invention consists generally in a device of the form, arrangement, construction and co-operation of the parts whereby the above named objects, together with others that will appear hereinafter, are attainable, and my invention will be more readily understood by reference to the accompanying drawings which illustrate What I consider, at the present time, to be the preferred embodiment thereof.

In said drawings:

Fig. 1 is a front elevation ofa machine embodying my invention.

Fig. 1A is a perspective view of a bolt which has been drilled and which is the object of the machine shown in Fig. 1.

Fig. 2 is a left hand-end elevation of the machine shown in Fig. 1.

Fig. 2A is a detail view on an enlarged scale substantially along the line 2A2A of Fig. 2.

Fig. 2B is a perspective view of a nut member shown in Fig. 2A.

Fig. 3 is a vertical section through the spindle ot' the machine and viewed substan tially along the line 33 of Fig. 1.

Fig. 4 is a detail sectional view substantially along the line 44 of Fig. 3.

Fig. 4A is a detail sectional view substantially along the line 4A-4A of Fig. 4.

Fig. 4B is a fragmentary sectional detail view of certain of the parts which will be more specifically referred to later.

Fig. 5 is a section on the line 5-5 of Fig.

Fig. 6 is a detail view substantially along the line 66 of Fig. 5.

Fig. 7 is a detail sectional view substantially along the line 77 of Fig. 5.

Fig. 8 is a detail sectional View, on an enlarged scale, substantially along the line 8-8 of Fig. 7

Fig. 9 is a section on the line 99 of Fig. 1.

Fig. 10 is a sect-ion on the line 1010 of F ig. 1.

Figs. 11, 12, 13 and 14 are detail views substantially along the line 1111 of Fig. 3, the parts being shown in different operative positions.

Fig. 15 is a detail View of one of the lever mechanisms shown in Figs. 11 to 14 inclusive.

Fig. 16 is a member.

Fig. 17 is a perspective view of one of the control or escapement members shown in Figs. 11 to 14, inclusive.

Figs. 18, 19, 20, and 21 are detail descriptive views substantially along the line 1818 of Fig. 3, the parts being shown in different operative positions.

Fig. 22 is a sectional View substantially on the line 2222 of Fig. 3.

Fig. 23 is a view of the special drill construction disassociated from the remaining parts (the assembled shown in Fig. r

Fig. 24 is a perspective view, a part thereoi. being broken away of the member in which the drill shank is positioned.

Fig. 25 is a perspective view of a chuck member for gripping or locking the drill shank in the member shown in Fig. 24.

Fig. 26 is a member ada ted to exert the perspective view of this same necessary pressure against t e chuck member in Fig. 25.

Fig. 27 is a tool for operating the member shown in Fig. 26.

Fig. 28 is a sleeve member which surrounds the drill holding member of Fig. 24,

a portion thereof being broken away better.

to disclose the interior construction.

Fig. 29 is a perspective view of the work locking member.

Fig. 30 is a sectional detail view of the end portion of the device shown in Fig. 29

position being best 7 front and rear plates 3 and 4 respectively,

which are suitably secured to the basin as by means of a plurality of bolts 5. Mounted in suitable bearings carried by the plates 3 and 4 is a drive shaft 6 which is driven by means of the belt 7 and the drive pulley 8. The shaft 6 carries a worm 9 which meshes with a worm wheel 10 that is secured to the shaft 11.' The machine is composed of two complete operative mechanisms, one on each side of the centrally disposed worm wheel 10 but since they are both alike a description of one will suffice for both and since the mechanism depicted in detail is that shown at the left hand side of the machine that side will be described.

At the end the shaft 11 is reduced slightly as at 12 and the extreme end is again reduced as at 13 terminating in the threaded end portion 14 on which there is screwed a nut 15. Positioned on the reduced portion 12 of the shaft and abutting the shoulder 12 thereof is a disk 16, on the left hand side of which is a ring of friction material 17 which is. bevelled and which normally contacts with "a correspondingly bevelled portion 18 that is formed upon the member'19. The member 19 is mounted for free rotation upon the reduced portion 12 of the shaft 11. Secured to the member 19 by means of a plurality of machine screws 20 is a hollow cone 21. It is necessary in the operation of the machine to cause rotation of the cone 21, but under certain conditions of operation it is desirable to cause slippage between the drive shaft lland the cone. I, therefore, provide for driving the cone, by placing a ring of friction material 22 on the left hand side of the element 19 in contact with the conical surface 23 thereof and provide a pressure element 24 which is splined to the reduced ortion 13 of the shaft 11 as indicated at 25. nterposed between the nut 15 and the pressure element 24 is a spring 26 which constantly presses the pressure element 24 to the right, thus forming a friction drive for the member 19 to which the cone 21 is secured; Obviously, if any resistance is exerted on the cone 21 greater than the frictional drive, slippage will take place between the shaft 11 and the cone.

Secured centrally of the cone and outstanding from the end thereof is a bevelled certain periods, thus causing a winding of the spring 31 so that when the shaft 30 is free to move it is rotated a fraction of a revolution (60 degrees in the present instance) very rapidly. The details of the ma chine will be better understood if it is now stated that the work to be drilled, bolts 32 in this instance, slide by gravity down the inclined feed track 33 which is channel shaped so that the bolts hang by their heads 32, enter a work holder, are carried to a position in line with a drill in which position they are locked against movement while drilled, the drill withdrawn, the lock-in device released. and the drilled bolt discharged into the basin 2, a new bolt being simultaneously positioned for drilling.

The work holder is composed of upper and lower spaced members 34 and 35 respectively which are secured to the shaft 30 by means of the set screws 36 and 37 respectively. The members 34 and 35 respectively are provided with a plurality of aligned notches 38, six in number, having straight sides 38A and a curved bottom 38B concentric to the shaft 30 of a width slightly greater than the shank of the bolt, the bolts hanging from the upper member 34 by their heads, and being accurately centered by the clamping means later to be described.

If it be assumed that a bolt has just been drilled it will be found that the drill 39 is at the right hand end of its movement (see Fig. 3). It is carried by a spindle 40, which,

in turn, ispositioned within a sleeve 41.

The spindle 40 is caused to rotate with the sleeve 41 by means of the split conical member 42 which is forced longitudinally of the sleeve by means of the bushing 43, the threaded end 44 of which co-acts with screw threads 45 of the sleeve 41. A socket wrench 46 is provided to actuate the bushing movement longitudinally of the hollow cylinder 51. It will be understood that the pulley 49 operates at relatively high speed.

The bolt being drilled is locked against movement in the work holder by means of the plunger 56, one end of which is provided with bevelled faces.57 and 58 which are pressed tightly against the work. The plunger 56 is hollow and the drill and spindle operate therein. The drill is guided and held against undesired movement by the bushing 59 which is adjacent the operative end of the drill. The bevelled faces 57 and 58 of the plunger accurately center the work as they engage it and press it against the bottom of the notch in the work holder.

After the hole has been drilled in the bolt the drill is retracted, this being accomplished by moving the sleeve 53 to the left. The mechanism for this purpose comprises a cam surface 60 (best shown in Fig. 10) on the element 19 which is provided with a step portion 61. Upon the cam surface 60 there rides the end portion 62 of an arm 63 that is secured to the shaft 64, the arm being constantly urged toward the cam surface by the torsion spring 65 (best shown in Fig. 5) one end of which is attached to the frame of the machine and the other end to the shaft 64. WVhen the step 61 is reached the arm swings toward the cam, thus rocking shaft 64 to the right and through the medium of arm 66 and link 67 shifting sleeve 53 to the left which carries with it the drill, drill spindle and connected parts.

The work locking plunger 56 is retracted by yoke 68 which straddles it, engaging the slots 69 therein and the shaft 30 is rotated, thus bringing a new bolt into position and ejecting the drilled one. The control of the movement of the shaft 30 has not been stated as this preliminary description of the principal motions will help to an easy understanding thereof. Let us assume that the drill has been moved to the left, as has the work locking plunger 56 and that a bolt is in position in the path of the drill. At this time it will be found that the end 62 of the arm 63 is in engagement with a low part of the cam surface 60. As the cam 60 rotates the lever 63 is pressed back, thereby moving the drill and connected parts toward the work through the instrumentalities before described. Before the drill engages the work, however, the locking plunger is moved toward and into engagement with the work. This is accomplished by a notch 70, positioned in the periphery of the flange 71 of the cone member 21 striking the end portion 72 of a segment gear lever 7 3, which at this time is positioned in the path of movement of the notch, the toggle joint 74 at this time being in its broken position. This causes a straightening of the toggle and a rocking of the shaft 7-5 by means of th lever Y6. At

the opposite end the shaft 75 carries the yoke 68 which, as before described, engages the locking plunger and hence moves it toward and into locking engagement with the work. As the cam 60 rotates, sleeve 29 surrounding shaft 30 rotates but the shaft does not, being restrained by mechanism about to be described. This rotation of sleeve 30, therefore, results in winding spring 31. At the same time lever 63 is being pressed back, thus moving the drill into the work where it quickly and easily drills the desired hole because 117 is operating at high speed and is firmly guided into the work which is also firmly locked against movement. When the drill has completed the drill operation the arm 63 is swung quickly toward the right under the action of the torsion spring 65, which action is possible because the step 61 of the cam has been reached by this time.

lvhile the drilling operation takes place the shaft 30 is held against movement by mechanism shown in greatest detail in Figs. 11 to 17 inclusive. Fixed to the upper end of shaft 30 is a ratchet wheel 78 having a plurality of teeth 79 thereon. WVhen the work is being drilled the escapement lever 80, which is pivoted at 81, has one end porti on 82 in engagement with one of the teeth 79. For actuating the escapement lever, a lever 83 pivoted at 84 is provided, one end 85 entering a ball and socket joint 86 in the upper end of the arm 63 and the opposite end carrying a pawl 87. The pawl 87 is mounted upon a pivot 88 and a spring 89 is provided which tends to swing the end 90 into engagement with the pin 91. The pawl is stopped by the pin 91 in one direction but when suflicient force is exerted to overcome the spring 89 it can swing in the opposite direction. hen the lever 83 swings in a clockwise direction the end portion 92 of the pawl engages the projection 93 at the one end of the escapement lever, thus causing rotation of the pawl in a clockwise direction (see Fig. 12). Vhen the pawl has passed the end of the projection the spring 89 restores the end 90 into engagement with the pin 91. N ow movement of the lever 83 in a contra-clockwise direction causes a rocking of the escapement lever 80, since the pawl engages the face 93 of the projection 93 thus forcing the bevel end 94 past the spring pressed plunger 95 and to the opposite side thereof. It will be understood that the plunger 95 is depressed to permit this. This removes the end 82 of the escapement from the adjacent ratchet tooth 7 9 and per mits the spring 31 quickly to rotate the shaft 30, a partial revolution (60 degrees in the present instance) and thereby discharge the drilled bolt and move a new one into drilling position. The escapement is restored to the position of Fig. 11 by one of the ratchet teeth engaging the end portitin 96 thereoi (see Fig. 13) so that further rotation of shaft 30 is temporarily prevented. Just before the shaft 30 is permitted to rotate, however, the work locking plunger 56 is retracted. This is accomplished by a pin 97 (see Fig. 6) striking a finger-like extension 98 of a lever 99 the teeth 99 of which mesh with the teeth of lever 73 thus causing a breaking of the toggle 7 1-, and a swinging of shaft 75 and a rocking of the yoke 68. At this point it might be well to mention that lever is loose upon the shaft 7 5 and that the shaft is moved indirectly through the mechanism best shown in Figs. 6 and 7 the purpose of which is to provide a yielding pressure on the work holding plunger to the end that it may accommodate itself to variations in the sizes of the work. This will be best understood by considering the action of clamping the work in place when the plunger has engaged the work, and therefore, cannot rot-ate any more. At this time, however, the toggle mechanism 7% has not been fully straightened out. As it does finally straighten out, this additional movement causes lever 7 6, which is loose upon shaft 75, to wind up spring 100 (see 7). Spring 1.00 is initially provided. with the desired torsion in this manner. One end 101 thereof enters a. hole 102 in a plug 103 that is rotata-bly mounted in a sleeve 104: that is keyed to shaft 75. The other end 105 is disposed behind the lever 7 6. To place initial torsion in the spring, plug 103 is rotated and then locked by means of a pin 106 enter into one of a series of holes 107 therein.

To the lower end of lever 76 there is secured a pivoted bolt 108 which passes through an opening in an arm 109 that is secured rigidly to the shaft 75. A nut 110 is provided for adjusting the relation of the lever 76 and arm 109. This construction prevents the torsion in spring 100 from being lost but at the same time, permits lever 7 6 to swing so that its lower end may approach arm 109 when the work holding plunger has engaged the work to the end that the further straightening action of the toggle joint 74 may take place.

For the purpose of controlling the feeding of the work to and properly positioning it in the work holder, I have provided the mechanism, the details of which are best shown in Figs. 11 to 1d and 18 to 21.

This comprises a vertical shaft 111, to the upper end of which there is secured an arm 112 and to the lower end of which a finger 113 clamped by the means shown in Fig. 4B in a manner permitting a vertical adjustment of said finger 113 upon said shaft. The arm 112 carries two fingers 11 1 and 115 whereby it is alternately shifted. That is to say, it is shifted in one direction by engagement of depending pins 116 on the ratchet wheel 78' (see Figs. 4: and 11) with the finger portion 114; and in the opposite direction by the pin 117 (on the arm 83) engaging the finger portion 115. This causes a rocking movement of shaft 111 first in one direction and then in the other and causes swinging movement of the finger 113 in the one instance toward the work holder, thus pushing one piece of work into the slot adapted to receive it and restraining the. following work pieces (see Figs. 18 and 19) and in the other instance, swinging away from the work holder and thereby permitting the work to enter the then aligned opening in the work holder.

I neglected to mention that the chute 33 is attached to a vertically adjustable table which is held in place by means of the bolt 125 and the nut 126, the latter having a rectangular portion 127 that operates in a slot 128 in the frame. Thus work of different sizes can be accommodated.

lVhile it is apparent, it may be well to mention that the drive for the drill pulley 4:9 is, by means of the belt 129 that operates over the pulley 130, positioned on the main drive shaft 6.

From the foregoing description, it is apparent that the objects and purposes of my invention outlined in the opening of the specification as well as others are attained and it is believed that the many advantages thereof will be apparent without further comment.

I claim:

1. A bolt drilling machine embodying therein an upright step by step rotating member having arcuately spaced pocket-s thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle tosaid member and in line with one of the pockets therein, means providing a supporting engagement for a plurality of bolts and along which said bolts move and are directed into a pocket spaced from the one in line with the drill a rock shaft parallel with said step by step rotating member, a finger on said rock shaft adapted in one part of the movement of said rock shaft to engage and hold the bolt in the pocket in line with the drill, and means for moving the drill toward and away from said pocket in line therewith.

2. A bolt drilling machine embodying therein an upright step by step rotating member having arcuately spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said member and in line with one of the pockets therein, means providing a supporting engagement for a plurality of bolts and along which said bolts move and are directed into a pocket spaced, from the one in line with the drill, means for automatically clamping a bolt in said pocket in line with the drill including a rock shaft parallel with said step by step rotating memher and a bolt engaging finger on the rock shaft, and means for moving the drill toward and away from said pocket in line therewith. v

3. A bolt drilling machine embodying therein an upright step by step rotating member having arcuatciy spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said member and in line with one of the pockets therein, means providing a supporting engagement for a plurality of bolts and along which said bolts move and r are directed into a pocket spaced from the one in line with the drill, means for automatically clamping a bolt in said pocket in line with the drill including a rock shaft parallel with said step by step rotating member and a bolt engaging finger on the rock shaft, and means for moving the drill toward and away from said pocket in line therewith, said clamping means being released after the drill moves away from said pocket.

4:. A bolt drilling machine embodying therein an upright step by step rotating member having arouately spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said member and in line with one of the pockets therein, means providing a supporting engagement for a plurality of bolts and along which said bolts move and are directed into a pocket spaced from the one in line with the drill, means for yieldingly clamping a bolt in said pocket in line with the drill including a rock shaft parallel with said step by step rotating member and a bolt engaging finger on the rock shaft, and means for moving the drill toward and away from said pocket in line therewith.

5. A bolt drilling machine embodying therein an upright step by step rotating member having arcuately spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said member and in line with one of the pockets therein, means providing a supporting engagement for a plurality of bolts and along which said bolts move and are directed into a pocket spaced from the one in line with the drill, a rock shaft parallel with said step by step rotating member, a finger on said rock shaft for clamping a bolt in said pocket in line with the drill prior to the movement of the drill toward said pocket and for releasing it after said drill has been moved away from said pocket and means for moving the drill toward and away from said pocket in line therewith.

6. A bolt drilling machine embodying therein an upright step by step rotating member having arcuately spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said member and in line with one of the pockets therein, means providin a supporting engagement for a plurality 0 bolts and along which said bolts move and are directed into a pocket spaced from the one in line with the drill, a rock shaft parallel with said step by step rotating member, a. finger on said rock shaft for yieldingly holding a bolt in said pocket in line with the drill prior to the movement of the drill toward said pocket and for releasin it after said drill has been moved away from said pocket, and means for moving the drill toward and away from said pocket in line therewith.

7 A bolt drilling machine embodying therein, an upright step by step rotative shaft, means 011 said shaft providing arcuately spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said shaft and in line with one of the pockets therein, and movable toward and away therefrom, an inclined chute adapted to pendently hold a plurality of bolts and down which said bolts move by gravity, means for delivering bolts, one at a time into a pocket spaced from said pocket in line with said drill and means including a part for pushing a bolt from said chute into said pocket and for restraining the next succeeding bolt.

8. A bolt drilling machine embodying therein, an upright step by step rotative shaft, means on said shaft providing arcuately spaced pockets thereon, eachadapted to pendently receive a headed bolt therein, a

on said rock shaft for pushing a bolt from said chute into said pocket and for restraining the next succeeding bolt.

9. A bolt drilling machine embodying therein, an upright step by step rotative shaft, means on said shaft providing arouately spaced pockets thereon, each adapted to pendently receive a headed bolt therein, a drill arranged at a right angle to said shaft and in line with one of the pockets therein and movable toward and away therefrom, means for delivering bolts, one at a time into a pocket spaced from said pocket in line with the drill and means including a rock shaft parallel with said rotative shaft and a finger on the rockshaft for holding said therein, an upright step by step rotative shaft, means on said shaft providing'ar'cuately spaced pockets thereon, each adapted I to pendently receive a headed bolt therein, a

drill arranged at a right angle to said shaft and in line with one of the pockets therein and movable toward and away therefrom, means for delivering bolts, one at a time into a'poeke't spaced from said pocket in line with the drill and means for yieldingly holding said bolt in said pocket when said pocket is brought into line with the drill in the step by step rotative movement of the shaft and including a rock shaft parallel with said step' 'by step rotative shaft and a bolt hang pendently in apair of aligned pockets, 30

and a drill arranged at a right angle to said shaft and movable toward and away from said shaft in line with one of said pairs of aligned pockets.

12. A bolt drilling machine embodying therein, an upright step by step rotative shaft, spaced members secured to said shaft but adjustable thereon to accommodate different lengths of bolts and each having arcuat'ely spaced recesses providing, aligned pairs of pockets each adapted to receive the shank portion of a bolt with the head of the bolt engaging one of said members so that said bolt will hang pendently in a pair of v aligned pockets, an inclined chuteadapted to pendently receive a plurality of bolts movable therein, under gravity, said chute having an end positioned to deliver a bolt into a pair of said aligned pockets and a a drill arranged'at a right angle to said shaft and movable toward and away from said shaft inline with one of said pairs of aligned pockets.

13. Abolt drilling machine embodying therein, an upright step by step rotative shaft, spacedmembers secured to said shaft but adjustable thereon to accommodate dif ferent lengths of bolts and each having areuately spaced recesses providing aligned 1' pairs of pockets each adapted to receive the shank portion of a bolt with the head of the bolt engaging one ofsaid members so that said bolt will hang pendently in apair of alignedipockets, a drill arranged at a right angle to said shaft and movable toward and away from a bolt in one of said pairs of aligned pockets and means for yieldingly holding said bolt in said aligned pockets when the drill moves toward the same. i

14. A bolt drilling machine embodying therein, an upright step by step rotative shaft, means on said shaft providing arouately spaced pockets and which may be adjusted longitudinally along said'shaft to accommodate different lengths of bolts and each of which pockets adapted to pendently receive a bolt, a drill arranged at a right angle to said shaft and movable toward and away from said shaft, in line with one of the pockets therein, a rock shaft parallel with said step by step rotative shaft, and

means actuated by said rock shaft for holding said bolt in the pocket in line with said drill.

15. A bolt drilling machine embodying therein, an upright step by step rotative shaft, means on said shaft providing arouately spaced pockets each adapted to pendently'receive a bolt, a drill arranged at a right angle to said shaft and movable toward and away from said shaft, in line with one of the pockets therein, a rock shaft parallel with said step by step rotative shaft and a finger on said rock shaft adapted in the rocking movement of the rock shaft for holding said bolt in the pocket in line with the drill. v

16. A bolt drilling machine embodying therein, an upright step by step rotative shaft, two spaced collars adjustably secured thereto and having arcuately spaced recesscs therein providing aligned pockets each adaptedto pendently receive a headed bolt, with the head of the bolt engaging upon the topmost of said members, a vertically adjustable inclined chute adapted to pend entlyhold a plurality of bolts and having a discharge end adapted to direct the bolts one by one into each successive pocket, and a drill arranged at a right angle to the said rock shaft and movable toward and away therefrom inlinewith one of said pockets.

17. A bolt drilling machine embodying therein, an upright step by step rotative shaft, two spaced collars adjustably secured thereto and having arcuately spaced recesses therein providing aligned pockets each adapted to pendently receive a headed bolt, with the head of the bolt engaging upon the topmost of said members, a vertically adjustable inclined chute adapted to pendently hold a plurality of bolts and having a discharge end adapted to direct the bolts one by one into each successive pocket, a rock shaft parallel with said step by step rotative shaft, a finger longitudinally adjustable on said rock shaft and adapted to engage a bolt in one of said pockets to hold the same therein when said pocket is in one angular position with respect to said last mentioned shaft and movable toward and away from the said bolt in said pocket.

18. A bolt drilling machine embodying therein anupright step by step rotative shaft, means on said shaft providing arcuately spaced pockets each adapted to pendently re- (eive a headed bolt therein, an inclined feed track in which a plurality of bolts hang suspended by their heads, said track acting to deliver the bolts into one of said pockets, a drill arranged at a right angle to said shaft, means associated with said shaft for storing up energy for rapidly rotating said shaft step by step, to bring said one of said pockets into line with the drill and means for moving the drill toward and away from the bolt in said pocket in line therewith.

19. A machine of the class described, comprising in combination, a step by step rotative work holder, positive means for automatically feeding work thereto, a power actiiated tool extending in a plane at a right angle to the work holder, means including devices for storing up energy for rapidly moving the work holder to position work in line with the tool, and means for moving the tool into and out of operative position.

20. A machine of the class described, comprising in combination, a step by step rotative work holder adapted to receive work at one point, a power actuated tool positioned at another point and extending in a plane at a right angle to the Work holder,

means tending to move the work holder to position the received work in line with the tool, means restraining such movement and for storing up energy therein, means for releasing said restraining means at a predetermined time so that the stored up energy operates to rotate said work holder one ste to bring the work into line with the tool and means for moving the tool into and out of operative position when the work is aligned therewith.

21. A machine of the class described, comprising in combination a step by step rotative work holder adapted to receive work at one point, a power actuated tool positioned at another point and extending in a plane at a right angle to the work holder, means tending to move the work holder to position the received work in line with the tool, means restraining such movement and for storing up energy therein, means for releasing said restraining means at a predetermined time so that said stored up energy operates to rotate the work holder one step to bring the work into line with the tool and means for clamping the work when positioned in line with the tool.

22. A machine of the class described, comprising in combination, a step by step rotative work holder adapted to receive work at one point, a power actuated tool positioned at another point and extending in a plane at a right angle to the work holder, means tending to move the work holder to position the received work in line with the tool, means restraining such movement and for storing up energy therein, means for releasing said restraining means at a predetermined time so that the stored up energy operates to rotate said work holder one step to bring the work in line with the tool, means for clamping the work when positioned in line with the tool, and means for moving the tool into and out of operative position.

23. A machine of the class described, comprising in combination, a step by step rotative work holder adapted to receive work at one point, means for feeding work to the work holder at that point, a power actuated tool positioned at another point andextending in a plane at a right angle to that of the work holder, means tending to move the work holder to position the received work in line with the tool, means restraining such movement and for storing up energy therein, and means for releasing said restraining means at a predetermined time so that said stored up energy operates to rotate the work holder one step to bring the work in line with the tool.

24:. A machine of the class described, comprising in combination, a work holder adapted to receive work at one point, a power actuated tool positioned at another point, means operable to store energy while the Work is being operated upon, a tool, means for moving the tool into and out of operative position, and means for releasing said stored energy after the tool has moved from its operative position to effect movement of the work holder.

25. A machine of the class described, comprising in combination, a work holder adapted to receive work at one point, a power actuated tool positioned at another point, means operable to store energy while the work is being operated upon, a tool, means for moving the tool into and out of operative position, and means for releasing said stored energy after the tool has moved from its operative position to effect movement of the work holder, and means for stopping work holder at a predetermined point.

26. A machine of the class described, comprising in combination, a. work holder adapted to receive work at one point, a power actuated tool positioned at another point, means operable to store energy while the work is being operated upon, means for clamping the work in the work holder, a tool, means for moving the tool into and out of operative position, and means for releasing said stored energy after the tool has moved from its operative position to effect movement of the work holder.

27; A machine of the class described, comprising in combination, a work holder adapted to receive work at one point, a power actuated tool positioned at another point, leans operable to store energy while the work is being operated upon, means for yieldingly clamping the Work in the work holder, a tool, means iior moving the tool into and out of operative position and means for releasing said stored energy after the tool has moved from its operative position to effect movement of the Work holder.

28. A machine of the classdescribed, comprising in combination, a Work holder adapted to receive work at one point, a power actuated tool positioned at-another point, means operable to store energy while the work is being operated upon, a tool, means for moving the tool into and out of opera tive position, said means including nonpositive means for moving the tool to operative position, and means for releasing said stored energy after the tool has moved from its operative position to effect movement of the work holder.

In testimony whereof, I have hereunto set my hand, this 28th day of December, 1923.

THEODORE 'P. CAULKINS'.

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