US1122068A

US1122068A - Worm-wheel generator or milling-machine.

Info

Publication number: US1122068A
Application number: US7?404413A
Authority: US
Inventors: Percy Brown; Francis John Bostock
Original assignee: Individual
Current assignee: Individual
Publication date: 1914-12-22
Anticipated expiration: 1931-12-22

Description

P. BROWN & P. J. BOSTOGK. WORM WHEEL GENERATOR OR MILLING MACHINE.

APPLICATION FILED OGT.8, 191 3.

1,1 22,068. Patented Dec. 22, 1914.

4 SHEETSSHEET l.

P. BROWN & F. J. 'BOSTOOK. WORM WHEEL GENERATOR OR MILLING MACHINE. APPLICATIQN FILED 00T.8, 1913.

1, 1 22,068. Patented Dec. 22, 1914.

4 SHEETS-SHEET 2.

' .'1 :.;BR0'WN & P. I. BOSTOGK. ww. WORM WHEEL GENERATOR OR MILLING MACHINE.

i v APPLIGATIYON FILED 00T .8, 1913.

1 1 22,068. Patented Dec. 22,1914.

4 SHEETS-SHEET 3.

. P. IBR0W1\T&F. J. BOSTOGK. WORM WHEEL GENERATORVOR MILLING MACHINE.

APPLIO ATION FILED 00128, 1913.

Patented Dec. 22,1915

4 SHEETS-SHEET 4.

in it Malia in willit: n

i XVORIEJNHEEL (RENEE 'C'R CB. llIiLLINCT-;ACHII?E.

Application filed October S, 1313.

To (ZZZ 2071 m it may concern Be it known that we, PERCY BROWN and FRANCIS JOHN Bosrocn. subjects of King George V of Great Britain, residing at Huddersfield, in the county of York England, have invented certain new-and useful Improvements in ll orm-llheel Generators or Milling-lviachines, of which the following is a specification.

This invention has reference to worm Wheel generating or like milling machines, and comprises an improved construction or arrangement of the cutter carrying head which is specially intended to take all the lateral strains or stresses set up during the cutting" or generating operation and eliminate overhang of the parts, the said head containing the whole of the mechanism for driving the cutting hob and enabling the hob to be fed either directly into the worm Wheel or like blank or tanfzjcntially to it.

The invention will described with reference to the accompanying drawings, in which Figure 1 is a. front elevation of a worm wheel generating niachine having the improvemcnts applied thereto; 2 is a plan view of the machine; Fig. 3 is a side cleration of the machine, looking in the direc tion of the arrow A, Fig. '2, and l is a side elevation, partly in section. looking in the direction of the arrow B, Fig.

According to our invention we employ a cutter head 1 slidahle on ways on the machine frame 9 toward or away from the rotatable work table 3 carrying the spindle 4 on which the worm wheel or like hlank'to he cut is secured. The portion or face 5 of the head on which the slide 6 carrying: the hob spindle 7 is mounted. is made to incline, as is shown clearly in Figs. 3 and i from its lower edge outwardly or forwardly at a suitable angle to the vertical axis of the work spindle 4, the angle used being approximately that of 45 though this may be varied somewhat either way without detriment. The guide surface of the. frame is horiaontal when the spindle at is vertical, and the guide face 5 of the head is arranged at an acute au lo to and suhtending. or exhoh slide he verti- Spcciacation of Letters Eetent.

Patented Rec. 22,

Serial Etc. 794,044.

the work which is so common on other worm wheel ieratingi machines. At the same time ovcri'iang of the support for the hob spindle eliminated. and we are enabled to out very small wheel.

The machine is driven from a single pulley S by means of a friction clutch 9 operated hy a hand lever 10 fast on the end of rod 11 extending to the far side of the machine. Motion is transmitted from the pulley 8 through a suitable chance speed gear box 19 to a horizontal shaft 13 which, through suitable gears or dividing change wheels H 3 es motion to a shaft 15 from which the work table is driven by worm and wormwheel, not'shown. The change speed gear 19 is controlled by a hand wheel 16 "fast on the end or" a rod 17 extending to tile for side of the machine. The shaft has akeyway 18 in which is slidable a key 19 carried by a bevel wheel 90 supported in a bearing n a bracket 21 carried by the head 1. The head 1 is slidable toward or away from the work table by means of a feed screw'22 (Fig. 3) passing through a denendin r nut 93 on the head. the screw 2-2 carrying a bevel wheel 24 meshing with he'el wheel (Fig. 2) fast on a shaft 26 .ch extends to the same side of the machine as the rods 1'1 and 17, and provided with an operating hand wheel 2?.

The head 1 carries all the mechanism, for rotating and traversing the hob cutter. and the motion for driving such mechanism is transmitted through the bevel which slides to and fro on the main shaft the head is mo ed toward or away from the work ahle according to the diameter of the blank being out. A short diagonal shaft '29 supported by the bracket 21 has fast on its lower end a bevel wheel 30 which meshes with the bevel wheel 20 and this shaft *3) drives both the hob rotating mechanism and the hoh slide traversing mechanism. The rotation of the hob is effected through a diii orcntial motion or compensating gear 28 at the upper end of the shaft '29 which ditt'erential motion drives a short diagonal shaft having: fast thereon a worm 32 mesh ng with a worm wheel sliilahly keyed on the hoh spindle 7. The short-diagonal shaft 31 an extension of the interiitc dri ing shatt if. being: a Tet-(l y in line with an remix to t the compcnsatio extension shaft 31 is connected positively with the hob spindle 7. l The directness of the drive from the shaft 13 to the hob spindle which will best be understood by an examination of Fig. l, obviates the use of the long shafts or driving connections between such parts,

the importance and advantage of which will be readily appreciated by those skilled in i motion 28 is a worm 34 Which meshes with a worm wheel 35 fast on a transverse shaft 36. This transverse shaft drives, through a- 1; suitable change speed gear 37, a hollow transverse shaft 38, fast on which is a worm 39 meshing with a worm wheel 40 fast on a short shaft ll, which is supported in a suitable bearing 42, and has fast upon its front :0 end a bevel wheel 43. A feed screw'l l,

passing through a nut on the slide 6, carries a, sliding clutch 46 rotatively connected to it, and two loosely rotatable bevels 4:7 and i8 meshing with the bevel 43. Movement of the clutch 46 into driving engagement with one or other of the bevels 47 or 48 which rotate in opposite directions, will cause the screw it to be rotated in one direction or the other whereby the slide 6 can be trav- 30 erscd in either direction according as the hob cutter employed be a-right hand or a left hand cutter. Suitable automatic trip gear is provided to disengage the clutch at the end. of movement of the slide in either direction. Any approved trip gear can be used, and the trip gear shown comprises lugs on the slide 6, as shown in Fig. 1, adapted to come in contact with a collar 61 on arod 62 which is slidable longitudinally 40 me bearing 63 on the head 1. The rod 62, as shown in Fig. 3, is operatively connected with a lever 64 secured on a rock-shaft 65 which is carried by the head. The lower end of the rock-shaft 65 has a lever 66 secured on' it, and the free end of the lever 66 engages with a circumferential groove in the clutch 46, see Fig. 2, which clutch is splined on the feed screw 44 shown in Figs. 2 and 3. The rate of traverse of the slide is determined by the change speed gear 37, which may be of any suitable construction to give the desired range of speeds, and is controlled by a hand wheel 4-9 located on the same side of the machine as the hand Wheels l6 and 27 and hand lever 10. The hand wheel 49' is suitably graduated to show the feed per revolution of the hob.

To provide for variation of the speed of.

rotation of the hob relatively to the rate of 59 feed of the slide 6 by which the hob is traversed the feed screw 44: is connected by change gearing 50 with a transverse shaft 51 passing through the hollow shaft 3. said shaft having fast on its opposite end a worm the angle of which is such that the worm 52 nieshes with a worm'wheel 53 integral with or secured to the casing of the differential motion 2S ,and by varying the speed of rotation of said casing the rotary employed a secondintermediate wheel would be provided in' the change gearing 50in order to preserve the proper direction of rotation of theshaft 51. Disengagement of the clutch 46 at the end of movement of the slide 6 in either direction, that is to say on completion of a cut,- stops the feed and also stops thedifferential action of the motion 28, as will be understood. When a cut has been completed, that is to say, when the trip motion has brought about disengagement of the clutch 4-6, the machine is stopped and the feed screw 4.4 is rotated by. hand, by means of a handleapplied to the squared end 5% of the screw, to reverse the movement of the slide 6 and carry the hob back to the commencing position. Through the change gears 50, shaft 51, worm 52 and worm wheel 53, the differential motion is simultaneously operated to cause the hob to speed of the hob is varied as will be under- .7 stood. In the event of a left hand hob being be rotated as it is moved back, thc. remainder of the mechanism meanwhile remaining stationary. The speed of rotation of the hob as it is moved back is determined by the change gears 50. By the means described, the position of the hob relative to the work can be set up by hand, thereby re lieving the operator of the considerable labor involved in rotating the work table to set up the hob to the work as is usual. It will be observed that the whole of. the hob operating mechanismjs carried by the cutter head and moves therewith as the head is fed toward or away from the work table; the drive for rtfiating the hob is as direct as possible; diiferntiation for lead is on to the hob drive and not on to the Work; the hob slide can be moved, and the hob rotated, by hand without affecting the remainder of the machine, While the control of the mechanism is so arranged as to be within easy reach of the operator when standing in the best position for viewing the cutting of the wheel.

The details of construction shown may be varied without departing from the invention within the scope of the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In a milling machine, the combination,

with a supporting frame, and a work spind e carried thereby; of a head carried by the frame and arranged adjacent to the work spindle and provided with a guide face arranged in an upwardly and forwardly 111-- clined position with respect to the work a feed screw engaging with spindle, and hob slide carried by the head and vvorking against its inclined guide face.

2. in a milling machine, the combination, with a supporting frame provided with a guide surface, of a head slidable on the said guide surface and provided with a guide face arranged at an acute angle to and subtending the said guide surface, and a hob slide carried by the head and workingagainst its inclined guide face.

In a milling machine, the combination, with a supporting frame, a head slidable on the frame, and a hob slide slidable in the said head; of a nut secured to the hob slide,

the nut and carried by the head, an intermediate driving shaft carried by the head, driving mechanism connecting the intermediate driving shaft with the feed screw, a main driving shaft carried by the said frame, and drivingmechanism slidable longitudinally of the main driving shaft and operatively connecting it with the intermediate driving shaft.

at. In a milling machine, the combination, with a supporting frame, a head slidable on the frame, and a hob slide slidable in the said head; of an intermediate driving shaft carried by the head, a main driving shaft carried by the said frame, driving mechanism slidahle longitudinally of the main drivinshaft and operatively connecting it with toe intermediate driving shaft, a hob spindle glonrnaied in the hob slide, and intermediate driving mechanism operatively connecting hob spindle with the said intermediate driving shaft.

5. in a milling machine, the combination, with a head, and a hob slide slidable in the head; of an intermediate driving shaft carried by the head, an extension shaft arranged in line with the said shaft and .also carried by the head, eratively connecting spindle journaled in devices operating to revolve the hob the two shafts, a hob spindle from the said extension shalt, traverse the hob spindle relatively to the speed of traverse of the hob slide.

6. In a milling machine, the combination, with a head, a h'ob slide slidable in the head, and a hob spindle journaled in the hobslide-g of a driving shaft formed in two sections, compensating gear operatively connecting the said sections, traversing mechanism, for sliding the hob slide, operatively connected to one shaft section, driving devices operating to revolve the hob spindle from the other shaft section, and driving connections provided with change gearingand operatively connecting the said traverse mechanism with the said compensating gear and operating to vary the speed of rotation of the hob spindle relatively to the speed of traverse of the hob slide.

In testimony whereof We aiiix our signa tures in the presence of two Witnesses.

PERCY BROWN. FRANCIS JOHN BOSTGCK.

Witnesses:

W. WHITELEY, C. E. Hmcnrrrr.

compensating gear opthe hob slide, driving I