US2008013A

US2008013A - Operating mechanism for turret lathes

Info

Publication number: US2008013A
Application number: US414417A
Authority: US
Inventors: William H Foster
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-12-16
Filing date: 1929-12-16
Publication date: 1935-07-16
Anticipated expiration: 1952-07-16

Description

July 16,1935. w. .4. FOSTER 2,008,013

OPERATING MECHANISM FOR TURRET LATHE-S Filed Dec. 16, i929 2 Shee ts-Sheet 1 Int/6%: LUiZZiam fil o ster.

July 16, 1935. w, os E 2,008,013

OPERATING MECHANISM FOR, TURBET LATHES Filed Dec. 16, 1929 2 Sheets-Sheet 2 JnwTZZFr: CUiZZiam fijb aier- Patented July 16, 1935 UNITED STATES PATENT OFFICE OPERATING MECHANISM FOR TURRET LATHES William H. Foster, Elkhart, Ind.

Application December 16, 1929, Serial No. 414,417 20 Claims. (01. 2942) The invention relates to improvements in pres- The present invention is especially adapted for sure operated mechanism and has reference more application to turret lathes of the type as disparticularly to a novel fluid actuated device for closed in the applicants co-pending application, association with hydraulic turret lathes. Serial No. 352,427, filed April 4th, 1929, employing 5 An object of the invention is to provide an ima turret slide 4 (Figure 2), having reciprocating 5 proved automatic operating mechanism for turmovement upon the bed of the lathe 2, which ret lathes, which will be adapted to meet the serves to present the various tools 5 into posineeds of commercial operation of such machines. tion for operation upon the work piece. Upon Another object is to provide a fluid pressure opthe slide is rotatablymounted a turret 8 of the l0 erated mechanism for actuating turret lathes, conventional type, common to all turret lathes 10 which will serve to reduce to a minimum the time and generally provided with a plurality of staconsumed between the completion of one operations for holding in position the various tools. tion upon a piece of work, and the starting of The turret slide is equip d th Su tab mechthe next operation upon the same piece. anismforaccomplishing the reciprocating move- A further object is to provide improved hyment upon the bed of the machine, which may be 15 draulic operated mechanism for controlling the operated either manually or automatically. Inmovement of the turret slide, which will embody tor-related with this mechanism and operating special features for allowing a more efficient into rotate the turret are other means which are dexing of the turret. adapted to be brought into operation upon the A yet further object is to provide an improved rearward movement or retracting of the turret pressure actuated mechanism, preferably using slide to rotate the turret one station or to index oil as an operating medium, which will adapt itt e tu e as it is known- This Presents 9; difi self for use in various ways as a source of power out tool in alignment with the work piece up for actuating machinery, employing the minithe chuck, whereupon the forward movement oi.

mum number of parts, and which will be posithe turret slide can then take place to bring the g tive and reliable in operation. tool into contact with the work piece. It. is seen Still another object of the invention is 'to protherefore that Pa O t a wa d m vement vide a fluid actuated mechanism adapted for im- 0f the turret S de imparts a uat on o mechae parting reciprocating movements to a-turret slide 1118111 o de th turret, Which necessarily which will allow for a rapid speed of the slide to qu r s a deceleration in the speed of the slide to 30 take place in retracting the same up to the time al w an m ient p rati n f t s ind n chindexing starts and which will then decelerate the anism. However, the adva ci m v n of-the speed to allow emcient operation of the parts for Slide can take place at the normal spe d. s the proper indexing. In addition, the mechanism indexing is complete when the extreme rearward also allows for a rapid speed of the slide in its m vement of the slide is reached. 35 forward movement. This makes possible a. maxi- Referring to Figure 1, a cylindrical member I! mum in speed both forward and retracting and is disclosed comprising the cylinder of themechat the same time provides for a speed consistent anism and has fitted therein, a piston or pl with the indexing cycle. 1 w l2. The piston has provided on its bearing sur- 40 With these and various other objects in view, face rings or suitable packing It, which insure 40 the invention may consist of certain novel feaa perfect fit between the bearing parts, to pretures of construction and operation, as will be vent the pressure fluid from leaking past the more fully described and particularly pointed out piston. The piston has suitably secured thereto in the specification, drawings and claims appenda piston rod IE, which is adapted to constitute ed hereto. the actuating means and as such is mechani- 45 In the drawings, which illustrate an embodi- 'cally connected through means of the bracket .ment of the device and wherein-like reference I! to the-turret slide d. The movementsof the characters are used to designate like partspiston are in this manner imparted to the slide Figure 1 is a sectional view taken substantially to cause the retracting and forward movements through the center of the improved hydraulic opof the same. The cylinder in .has secured there- 50 erated. mechanism constructed in accordance to through suitable bolts l8 a closure member with the present invention. .20 comprising the right end of the cylinder'and Figure-2 is a rear elevation of a turret lathe provided with an opening 22 for allowing exit showing hydraulic operated mechanism associ- "of the piston rod l6. A collar 24 is adjustably ated therewith. secured to the closure member and is adapted is adjustably secured in the member 26 and a- The member 26 is provided with a bore 32 ex-- tending substantially its entire length and of a diameter smaller than the inside diameter of the cylinder I 0. A tubular plunger 34 operates Within the bore and is adapted to have a close fitting engagement therein, the surfaces of the bore and the outside surface of the plunger being machined to exact dimensions. A spring 36 fits within the bore 32 and extends within the tubular plunger 34. The end wall 38 of the member 26 and the wall 40 of the plunger serve as bases to limit the extension of the spring. For holding the plunger 34 within the bore 32 against the action of the spring, but at the same time to allow the plunger to have movement therein, a pin 42 groove 44 is provided in the plunger longitudinally thereof, ending however at 45. This allows the plunger to have reciprocating movement therein but prevents its release as the pin engages the end 45 of the groove. The action of the spring 36 tends to keep the plunger always in extended position, that is, extending within the piston chamber defined by the cylinder I II.

Extending the entire length of the member 26 is a duct or passage 46 of small diameter the greater part of its length and of a somewhat larger diameter designated 48 at the portion through the wall 38. Sloping sides 50 join the larger opening with the smaller and are adapted to have located adjacent thereto the pointed end 52 of the regulating screw 54. A passage 55 connects the opening 48 with the bore 32 so that [any pressure fluid within the bore can be forced through the restricted opening formed by the regulating screw 54 and be conducted into the piston chamber. .By varying the size of the restricted opening, which is accomplished by screwing inward or outward the screw 54, the flow of fluid out of the bore can be regulated. Also related in operation to this structure are passages 56 and 58, formed in wall 40 of the plunger, which also form a conduit from the bore 32 to the piston chamber. However, this means of escape for the pressure fluid is closed when pressure within the bore forces the ball 60 into engagement with its seat, thus closing passage 56. A spring 62 tends to hold the ball down against its seat, thus constituting a check valve.

As previously explained the actuating fluid is forced under pressure into either pipe 64 located at the right end of the cylinder, or pipe 66 located at the opposite end, by means of a control valve depending on whether the turret slide is to be retracted or moved forward into cutting position. Assuming for the purpose of illustration that the turret slide is-to be retracted to index a turret one station, oil which preferably forms the pressure fluid, is therefore forced under high pressure into pipe 64 and into the piston chamber to the right of the piston l2, thus forcing the piston to the left, as viewed in Figure -1. The piston has opportunity to acquire a rapid speed up to its engagement with the plunger 34. which thus allows the slide to have a rapid retracting movement for part of its stroke, until it begins toindex as described. For this the speed of the piston must be cut down, which is accomplished by movement of the plunger 34 to the left. The oil within the bore 32 and the hollow portion of the plunger is put under. compression which consequently closes the check valve 66 and allows the oil to escape only through the restricted opening 50. The size of opening 50 is so regulated that the necessary decrease in speed of the piston l2 can be accurately secured.

The piston upon reaching the end of its stroke in its travel toward the left is then forced back again by oil under pressure issuing from pipe 66, the supply in pipe 64 being cut off.

The plunger, however, with the piston in its left hand position is located within the bore 32 and is forced out by spring 36 as soon as piston l2 moves to the right. Valve 60 is so constructed that pressure on the outside will unseat the ball allowing the oil to flow within the plunger and the bore. During this movement of the piston l2, that is, to the right as viewed in Figure 1, the piston will have an unrestricted course and will so attain a rapid speed giving to the turret slide consequently a rapid speed for its forward movement.

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

1. In a device of the class described, in combination with a movable member, of fluid pressure means for operating said member, said fluid pressure means comprising a cylinder, a piston operating within said cylinder, conduits having access to said cylinder to supply a fluid under pressure selectably to the two sides of said piston, and a plunger journaled in a wall of said cylinder at one side of said piston adapted to be moved by said piston when said piston is adjacent to one end of its stroke, said cylinder having a restricted passageway therethrough providing communication between the two ends of said plunger to cause a decrease in speed of said pistonadjacent to said end of the movement of said piston.

' 2. In a, device of the class described, in combination with a movable member, of fluid pressure means for operating said member, said fluid pressure means comprising a cylinder, a piston operating within said cylinder, a plunger journaled in a wall of said cylinder normally extending within said cylinder and adapted to be engaged by said piston to cause a decrease in the speed of the piston in one direction of movement, said cylinder cylinder and-extending axially thereof, a plunger operating within said bore, means for allowing ingress of the fluid within said bore during one direction of movement of said piston and other means to regulate the escape of said fluid during the opposite direction of movement.

4. In a device of the character described, in combination, a cylinder provided with end walls forming a chamber, a piston operating within said chamber, means for supplying a pressure medium selectably to both sides of said piston, a bore in one end wall of said cylinder, a plunger fitted within said bore and extending into said chamber in a position to be engaged by said piston when said piston is adjacent to one end of its range of movement, said cylinder being provided with a restricted passageway providing communication between the ends of said plunger.

5. In a device of the character described, in combination, a cylinder provided with end walls forming a chamber, a piston operating within said chamber, means for supplying pressure medium to both sides of said piston, a bore in one end wall of said cylinder, a plunger fitted within 'said bore andextending normally within said chamber, means in said end wall providing a passage from said bore to the chamber, and other means in said plunger providing a second passage for the purposes described.

6. In a device of the character described, in combination, a cylinder provided with end walls forming a chamber, a piston operating within said chamber, a bore in one end wall of said cylinder, a plunger fitted within said bore, said plunger adapted to extend normally in the path of the piston, a restricted opening in said wall providing a passage from the bore to the cham her, and a second passage located within said plunger for the purposes described.

7. In a device of the character described, in combination, a cylinder provided with end walls forming a chamber, a piston operating within said chamber, a bore in one end wall of said cylinder, a plunger fitted within said bore, said plunger adapted to extend normally in the path of the piston, a restricted opening in said wall providing a passage from the bore to the chamber, means for regulating said opening, a second passage located within said plunger, and a check valve for closing said second passage for the purposes described.

8. In a device of the character described, in combination with a cylinder, a piston operating within said cylinder, of an end wall adapted to be fitted to said cylinder, said wall being provided with a bore, a plunger fitted for movement within said bore, a hollow portion provided in said plunger and communicating with said bore,

a spring within said bore and hollow portion tending to keep said plunger extended, a passage in said wall communicating with said bore, and a second passage in said plunger communicating with the hollow portion for the purposes described.

9. In a turret lathe, in combination, with a turret slide, of aturret adapted to be indexed in response to reciprocations of said slide, fluid pressure means for operating said slide comprisin a cylinder, a piston operating within said cylinder, conduits having access to said cylinder to supply a pressure fluid to both sides of said piston, a tubular plunger operating within one end wall of the cylinder, and a check valve on said plunger to prevent rapid escape of the fluid within, to cause a decrease in the speed of th piston in one direction of movement. I

' 10. Ina fluid pressure'mechanism, in combination, a cylinder, a piston operating within the cylinder, conduits connected to the cylinder to admit a pressure fluid selectably to opposite sides of the piston, means mounted for reciprocation in one end wall of the cylinder and normally projecting within the cylinder, said means being engaged by the piston in one direction of movement thereof, said cylinder being provided with a restricted passageway providing communication between thetwo ends of said means.

11. In a fluid pressure mechanism, in combination, a cylinder, a piston operating within the cylinder, conduits connected to the cylinder to admit a pressure fluid selectably to opposite sides of the piston, means mounted for reciprocation in one end wall of the cylinder and normally projecting within the cylinder, said means being engaged by the piston in one direction of movement thereof, said cylinder being provided with a restricted passageway providing communication between the ends of said means, said means being provided with a check valve for providing communication of less restriction between the ends of said means. I

12. In fluid pressure mechanism, in combination, a cylinder having end Walls forming a chamber, a piston operating within the chamber, conduits connected to the cylinder to admit a pressure medium selectably to opposite sides of said piston, a bore in one end wall of the cylinder, a plunger fitting in the bore and being resiliently urged in a direction to project within the cylinder, whereby the piston in one direction of movement engages the plunger to force the same within the bore, said cylinder having a restricted passageway providing communication between the ends of said plunger.

13. In a fluid pressure mechanism, in combination, a cylinder having end walls forming a chamber, a piston operating within the chamber, conduits connected to the cylinder to admit a pressure medium selectably to opposite sides of said piston, a bore in one end wall of the cylinder, a plunger fitting in the bore and being resiliently urged in a, direction to project within the cylinder, whereby the piston in one direction of movement engages the plunger to force the same within the bore, said plunger operating upon the pressure medium when being forced inwardly to cause a decrease'in the speed of the piston in that direction, said cylinder having a restricted passageway, providing communication between the ends of said plunger.

14. In a, device of the class described, in combination with a slide, of fluid pressure means for operating said slide, comprising a cylinder,-

a piston operating within said cylinder, conduits having access to said cylinder to supply fluid under pressure selectably to the two sides of said piston, and a plunger located in said cylinder at one side of said piston adapted to be moved,

providing less restricted communication between the ends of said plunger when fluid under pressure is admitted to that side .of said piston adjacent to said plunger.

15. In a device of the class described, in combination, a movable member, fluid pressure means for operating said member, said fluid pressure means including a cylinder, a piston operating therein, conduits having access to said cylinder to supply a fluid under pressure selectably to the two sides of said piston, a plunger journaled in a wall of said cylinder at one side of said piston adapted to be moved by said piston when said piston is adjacent to one end of its stroke, said cylinder having a restricted passageway providing communication between the two ends of said plunger, and adjustable means for varying the extent of restriction of said passageway.

16. In a device of the class described, in combination, a cylinder, a piston operating within said cylinder, conduits connected to said cylinder to communicate fluid under pressure selectably to opposite sides of said piston, a plunger journaled within a wall of said cylinder, a check valve for permitting ingress of fluid to one side of said plunger during one direction of movement of said piston, and other means to regulate the escape of said fiuid during movement in the opposite direction thereof.

1'7. In a device of the class described, in combination, a cylinder, a piston operating within said cylinder, conduits connected to said cylinder to supply fiuid under pressure selectably to opposite sides of said piston, said piston and a wall of said cylinder having cooperating plunger parts for causing a decrease in the speed of said piston during a portion of the travel of said piston in one direction, said wall of said cylinder being provided with a restricted passageway for permitting communication to the two sides of said plunger parts.

18. In a device of the class described, in combination, a cylinder, a piston operating within said cylinder, conduits connected to said cylinder to supply fluid under pressure selectably to opposite sides of said piston, said piston and a wall of said cylinder having cooperating plunger parts for causing a decrease in the speed of said piston during a portion of the travel of said piston in one direction, said wall of said cylinder being provided with a restricted passageway for permitting communication to the two sides of said plunger parts, said plunger parts being provided with a check valve for permitting communication between the two sides of said plunger parts during the other direction of movement of said piston.

19. In a device of the class described, in com-'- bination, a cylinder, a piston operating within said cylinder, conduits connected to said cylinder to supply fluid under pressure selectably to opposite sides of said piston, said piston and a wall of said cylinder having cooperating plunger parts for causing a decrease in the speed of said piston during a portion of the travel of said piston in one direction, said wall of said cylinder being provided with a restricted passageway for permitting communication to the two sides of said plunger parts, and adjustable means for controlling the extent of restriction of said restricted passageway.

20. In a device of the class described, in combination, a cylinder, a piston operating within said cylinder, conduits connected to said cylinder to supply fluid under pressure selectably to opposite sides of said piston, said piston and a wall of said cylinder having cooperating plunger ,parts for causing a decrease in the speed of said piston during a portion of the travel of said piston in one WILLIAM H. FOSTER.