US1850392A - Cobpobated - Google Patents

Description

March 22, 1932. F. s. HAAs I 1,850,392

MACHINE TOOL Filed July 2, 1928 Q 711// lll/All//lv VPatented Mai'. 22, y1932 UNITED STATI-:s

PATENT ori-"ica FREDERIOK S. HAAS, OF CINCINNATI, OHIO, ASSIGNOB TO CINCINNATI GRINDEBS, IN-

GOBPORATER'OF CINCINNATI, OHIO, A CORPORATION OI' OHIO i HAC'HINE TOOL Application led July 2, 1928. Serial No. 289,710.

One of the objects of the present inventionI is the provision of an automatic control for the coupling of the power and manual adjusting devices for such parts which will increase the safety of operation of the machine by insuring disengagement of the manual operating mechanism therefore thus eliminating the liability of the operator being accidentally injured by a turning part when the parts are subject to power actuation.

A further object of the invention is the provision of an improved mechanism which will render the manual adjusting device automatically available at all times when the arts are not eing power actuated thus resu ting in a saving of time of the operator in effecting desired adjustments.

Other objects and advantagesof the present invention should be readily apparent by reference to the following speci cation taken vin conjunction with the accompanying drawings and it will be understood that I may make any modifications in the specific structural details hereinafter disclosed within the scope of the appended claims without departing from or exceeding the spirit of the invention.

Figure 1 is a vertical sectional view through a portion of a grinding machine illustrating the prime features of the present invention.

Figure 2 is a vertical section as on line 2--2 of Figure 1 through the valvemechanism with the piston and cylinder for actuation of the machine tool table diagrammatically indicated in conjunction therewith.

Figure 3 is a fragmentary viewv showing the disengaged position of themanual shifting means. j

In the drawings, in which the invention is shown as applied to a grinding machine, the letter A designates the bed of the machine having the ways B and C supporting the reciprocating table member D, This table is designed to have a reciprocating or back and forth movement imparted thereto as by the piston E reciprocatable within the pressure cylinder F. The piston has its rod G suitably connected as by bracket H to the table so that the parts may move together.

Connections I and J extend from opposite ends of the cylinder so that the same may be poweractuatcd in either direction as desired. This directional actuation is controlled by a reversing valve K contained within the valve box L and serves in a well known manner to selectively couple one end of the cylinder with a suitable pump or other pressure supply source and the opposite end with the exhaust line.

It will be noted that the valve box L contains a. second sliding valve M which governs the general starting and stoppingof the machine. The pressure for actuation of the table cylinder is introduced through the pressure inlet line N while a pressure relief or outlet connection is provided as at O. This valve controlling the flow of actuating pressure into the valve box where its distribution is governed by the position of the reversing valve K. Y

It will be noted by reference to Figure 2k of the drawings that the valve box yL is formed at a point intermediate the inlet N and outlet O with a branch port or passage 10 communicating with the valve cylinder space 11 common to ports N and O. Leading from the port 10 is a. conduit 12 extending yto cylinder 13 having slidably mounted therein the piston 14 outwardly actuated by spring 15 surrounding a piston rod 16. This rod has on its rearwardly projecting end the shifter yoke 17, spanning pinion 18, splined on shaft 19. In its forward position the pin A ion meshes with transmission gear 20 carried bythe bed and in continuous mesh with rack 21 on the under side of the table. Shaft 19 is further provided with an actuating gear 22 adapted to be rotated by pinion 23 on f 18 back into mesh with Y shaft 24 having the hand wheel 25 at the front ofthe machine. Y

VBy reference to Figure 1 it will be seen that when the parts are in normal position 5 there is a complete gear line transmission from handwheel 25at the front ofthe machine to` rack21 on'the under side ofthe table so that manual rotation of wheel 25 will corres ndin l shift the table member. lo 1&0 g y owever when the starting valve is moved 'to the left hand position shown in Figure 2 admitting ressure through line N to the valve box by-pass through line 12 into cylinder 1,3 forc- 15 ing piston 14 rearwardly against the pressure of spring 1'5, This rearward movement will shift pinion 18 out of en gement with gear 20 as shown in Figure 3 t us automatically disconnecting the manual actuating 2 mechanism at the same moment that actuating ower is introduced into the valve chamber or hydraulic shifting of the table. The pinion will be held disengagedso lon as ressure is being admitted to the valve x or such power actuation. Reversely when the starting valve is shifted toward the right the valve flange 26 will shut ofi' the introduction of pressure from line N to space 11 and will couple this space with exhaust hole thus 3 relieving the pressure in c linder 13. Ex-

pansion of spring 15 will t en move pinion gear 2O when the parts are in condition for manual actuation.

To prevent accumulation of pressure in the rear of cylinder 13 a suitable outlet 28 is coupled therewith taking care of any leak` age past the plunger.

I claim:

1. In a machine of the character described o the combination with a' pair of relatively translatable parts of power means for imparting such relative movement, auxiliary manually actuatable means for imparting' such movement having an independent connection with the parts and automatic means for selectively determining the availability of said shifting mechanisms.

Y 2. 4In a machine tool, the combination with a pair of relatively translatable parts of power means for effecting such translation, manual means selectively operable to effect such translation having an independent connection with the parts and means for auto- 56 matically rendering the manual mechanism inoperative when the power-'mechanism is.

rendered operative.

3. In a machine tool, the combination with a pair of relatively translatable parts of o power means for eiecting such translation,

a. portion. of this ressure will operative, and means for automatically reconnecting the manual control mec 4. In a hydraulically actuated machine tool the combination with a air of relatively translatable parts of means or hydraulically translating'saxiie, additional known hydraulic means for eecting! a corresiiondin'g movement, mechanical means for e acting a translation of the parts and an hydrauhc disconnector automatically actuable by application ofhydraulic power to the machine to disconneet the other actuating mechanism.

5.'In a. hydraulical actuated-,1 machine tool the combination wit a pair of relativel translatable parts of means for h draulica ly translating same, additional own hydraulic means for electing a corresponding movement and an hydraulic disconnector automatically actuable by application of hydraulic power to the machine to disconnect the other actuating mechanism, and additional means for automatically reconnecting said other mechanism on discontinuance of the hydraulic actuation of the parts.

6. A machine of the character described including a bed, a table reciprocatable thereon, an hydraulic transmission line for supplying actuating power to the table, a mechanical transmission line for supplying actuating power to the table and connections between the hydraulic and mechanical lines for rendering the mechanical line inoperative when the actuating mechanism of the hydraulic line is operated.

7. In a machine tool structure the combination with a pair of relatively translatable parts, of an interruptible mechanical transmission for eifecting said relative movement, an hydraulically actuable means for interrupting said mechanical transmission, and additional means for automatically re-establishing the effectiveness of the mechanical transmission.

8. In mechanism of the character described, the combination with a pair of relatively translatable parts of hydraulic means for actuating said parts, an intei'ruptillble4 mechanical transmission for actuating said parts, an hydraulically actuable interrupter for the mechanical transmission and a single control valve for simultaneously coupling an hydraulic actuating su ply with the trans lating mechanism and tie interrupter. A

9. In an hydraulic grinder, the combination with a bed and a unit reciprocatable on the bed, of a mechanical transmission for effecting movement of the unit, said transmission including a part' movable to interrupt the transmission train, hydraulically actuable means for shifting the interrupter in one direction and resilient means fo'r oppositely urging same when the hydraulic pressure is relieved. Y i

10. In a machine of the character described the combination of a bed, a translatable memies' lll

ber carried thereby, a rack secured to the member, a manually actuable hand wheel carried by the bed, a gear train extending between the hand Wheel and the rack and operd able by the hand wheel, the said gear train including a shiftable gear to interru t the gear train, power means connected with the member for actuating same, and automatic means for shifting the slidable gear to interlo rupt the gear train when the power means is employed.

11. In a machine of the character described thecombination with a bed, a member` carried thereby and translatable relative thereto, a piston operativel coupled with the member, a cylinder enc osing the piston, an hydraulic medium, a conduit extending from opposite. ends of the cylinder for conveying the hydraulic medium thereto, a valve in the conduit controlling the flow of the medium through the conduit, an interruptible me chanical transmission line for translating the table, and means actuable by the hydraulic medium simultaneously with the flow of the medium through the conduit for interrupting the mechanical transmission line when the hydraulic mechanism is employed for translating the member.

l2. In a machine of the character described the combination with a bed, of a table carried thereby and translatable relative thereto, an hydraulically actuable mechanism for translating the table, including a source of fluid under pressure, and a valve controlling a5 the flow thereof, an interruptible mechanical transmission line for translating the table including a shiftable gear, a shifter rod therefor, a piston on the rod a cylinder enclosing the piston, and a conduit extending from the c linder to the control valve for conveying t e hydraulic medium to the cylinder on operation of the Valve to actuate the piston and shift the gear to interrupt the mechanical transmission line when the hydraulic mechanism is actuated.

In testimony whereof I aiix my signature.

FREDERICK S. I-IAAS.

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