US3829075A

US3829075A - Vise

Info

Publication number: US3829075A
Application number: US00290865A
Authority: US
Inventors: G Dziuballe; A Weber
Original assignee: HILMA MASCHF GmbH
Current assignee: HILMA MASCHF GmbH
Priority date: 1972-09-21
Filing date: 1972-09-21
Publication date: 1974-08-13
Anticipated expiration: 1991-08-13

Abstract

A vise having a fixed clamping jaw and a clamping carriage mechanically movable relative to the clamping jaw by means of a threaded spindle. Such vise is equipped with a fluid pressure operable amplifier, the amplifying pressure of which is conveyed to a high pressure chamber provided in the clamping carriage. The supply of pressure medium is controlled by valve means. When the clamping carriage engages the work piece, the valve is opened by means of an axial relative motion of a coupling shaft which is connected with the spindle by means of a disengageable clutch. The coupling shaft is operated by a crank handle which, when the clutch is engaged, also effects the mechanical feeding movement of the clamping carriage by means of the spindle. The automatic disengagement of the coupling shaft from the spindle and the axial and control movement of the coupling shaft resulting therefrom may be blocked by pressing in the coupling shaft.

Description

United States Patent [191 Dziuballe et al.

[ VISE [75] Inventors: Gerhard Dziuballe; Albrecht Weber,

both of Hilchenbach, Germany 22 Filed: Sept.2l, 1972 21 Appl. No.: 290,865

[58.] Field of Search 269/27, 28, 32, 221-223; 100/270 References Cited UNITED STATES PATENTS 8/1957 Seitter 269/32 X 6/1963 Freund 269/32 Primary Examiner-Roy Lake Assistant ExaminerNeil Abrams Attorney, Agent, or Firm-Walter Becker US. Cl. 269/28, 269/221 51 Int. Cl B25b 1/18 Aug. 13, 1974 [57] ABSTRACT A vise having a fixed clamping jaw and a clamping carriage mechanically movable relative to the clamping jaw by means of a threaded spindle. Such vise is equipped with a fluid pressure operable amplifier, the amplifying pressure of which is conveyed to a high pressure chamber provided in the clamping carriage. The supply of pressure medium is controlled by valve means. When the clamping carriage engages the work piece, the valve is opened by means of an axial relative motion of a coupling shaft which is connected with the spindle by means of a disengageable clutch. The coupling shaft, is operated by a crank handle which, when the clutch is engaged, also effects the mechanical feeding movement of the clamping carriage by means of the spindle. The automatic disengagement of the coupling shaft from the spindle and the axial and control movement of the coupling shaft resulting therefrom may be blocked by pressing in the coupling shaft.

3 Claims, 5 Drawing Figures 7 19 100 8 12d12e12b39 a 36 \I/ 1 ,1 MM 30 1. i1 1 W- w t 1 m- V E1511 1 1 .1/ 1. '1 I 33 1 1 1 .1 1 M 11 1 120 i it 1 7 11 1 I I 1; M H" AUBIBIQH 3.829.075 PMENIED sum 3 OF 3 Fig.3

VISE

The present invention relates to a vise having a fixed clamping jaw and a clamping carriage which is mechanically movable relative to the clamping jaw by means of a threaded spindle. More specifically, the invention concerns a vise of this type which is equipped with a clamping pressure amplifier for a pressure medium introduced into the vise, the amplifying pressure of which is conveyed to a high pressure chamber provided in the clamping carriage. A main piston is provided in the high pressure chamber, which main piston is supported in the lower part of the vise by the intervention of a screw or spindle and spindle nut, while the supply of the pressure medium is controlled by means of a valve. When the clamping carriage engages the work piece, the valve is opened by means of an axial relative motion of a coupling shaft or spindle which is connected with the spindle by means of a disengageable clutch. The coupling shaft or spindle is operated by a crank handle which, when the clutch is engaged, also effects the mechanical feeding movement of the clamping carriage by means of the spindle.

Vises of the above mentioned type having pneumatic-hydraulic power operations are known. With these vises a tightening or clamping is only possible by means of the pressure medium, because the supply of pressure medium is immediately discontinued when the clamping carriage abuts thework piece. As a result thereof, there is obtained the drawback that, during clamping of elastic work pieces, work pieces with deformable fins or burrs, and during clamping of a plurality of not completely flat work pieces which rest one upon the other, for instance, a bundle of sheets or laminations, the clamping stroke, which amounts to between l and mm, of the power operated clamping device is used up or consumed owing to the yielding of the work piece, so that the force exerted by thevise is not at all or only in part employed for clamping of the work piece. Due to this, the danger arises that the work piece will be pulled out of the vise during the working process because of faulty clamping.

It is an object of the present invention to eliminate the above described drawbacks of the known arrangement.

It is a further object of the present invention to produce a vise with which yieldable work pieces may be safely chucked or clamped.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings in which:

FIG. 1 shows a partially sectioned top view of a vise according to the invention.

FIG. 2 is a longitudinal section through the vise according to the invention along the line IIII of FIG. 1.

part of the clamping carriage according to the invention taken along the line V\ of FIG. 1.

The invention is characterized primarily in that the vise is so designed that the automatic disengagement of the coupling shaft or spindle from the spindle and the axial and control movement of the coupling shaft or spindle resulting therefrom may be blocked by pressing in the coupling shaft or spindle.

With a vise having a coupling comprising a coupling pin in the coupling shaft or spindle, a forked spindle head on the spindle, which head is provided with an inclined front surface portion for the coupling pin, and a pressure spring for loading the coupling pin in a direction of the spindle head, the forked spindle head is, according to the invention, below the inclined front surface portion, provided with a recess. The coupling pin with the coupling shaft or spindle is pressed into this recess, preferably against the force of a return or restoring spring, in a direction toward the spindle, so that a blocking of the coupling results and thereby of the valve which controls the supply of a pressure medium.

With the arrangement according to the invention there results essentially the advantage that during clamping of yieldable work pieces a mechanical preloading or preclamping by means of the spindle with blocked coupling is possible, so that during the subsequent power operated clamping the entire high pressure clamping stroke is available. In this way faulty clampings, especially of yieldable work pieces, are avoided, without an addition in the mechanical and the pneumatic hydraulic clamping force resulting.

Referring now to the drawings in detail, the vise illustrated is pivotally mounted on a turntable 1 for pivoting about a pivot 2 in order, with the aid of a marking and scale (FIG. 1), to make possible a precise angle adjustment of the vise with reference to the not shown machine table. The fixing of the vise upon turntable 1 is effected by four clamping screws 3, which respectively threadedly engage T-shaped groove blocks 4. As shown in FIG. 4, the groove blocks 4 are movably arranged in the corresponding guiding grooves 1a in the turntable l.

The vise comprises a lower portion 5 upon which, by means of two pins or bolts 6, a fixed clamping jaw 7 is fastened, the clamping jaw 7 being slipped upon the lower portion of the vise 5 with press fit. The vise further comprises a clamping carriage 8 which forms the movable clamping jaw and for this purpose, just as is the fixed clamping jaw 7, is provided with a clamping strip 9. To movably mount the clamping carriage 8, the lower portion of the vise 5 is provided with guide ways 5a, which are engaged from belowby guiding strips 8a of the clamping carriage 8. The connection between the clamping carriage 8 and the lower portion of the vise 5 results through a supporting angle member 10, which, by introducing a pintle or bolt 11 in several pintle bores 5b of the lower portion of the vise 5, is securable in different positions on the lower portion of the vise 5, and forms one piece with a spindle nut 10a.

A spindle 12, rotatably mounted in the clamping carriage 8, threadedly engages the spindle nut 10a. The rear end of the spindle 12 is radially journalled in a guiding sleeve 13, which is secured in the clamping carriage 8 by means of a spring ring 14. Between the flange or collar 12d of the spindle 12 and the guiding sleeve 13 there is an axial clearance which makes possible a high pressure stroke ofthe clamping carriage 8 of about 1 mm to 5 mm. The forward end of the spindle 12 is guided by a pin 15a of the main piston 15, which is housed in the cylindrical bore of a high pressure chamber 16 in the clamping carriage 8, and which rests on the forward end of the spindle 12 during the high pressure stroke of the clamping carriage 8. This main piston 15 is loaded by means of a cup spring packet 17, which is arranged between the main piston 15 and a guiding ring 18. The guiding ring 18 is in turn secured in the cylindrical bore of clamping carriage 8 by means of a spring ring 19. A further or inner spring ring 20 serves to mount the cup spring packet 17 upon the pin 15a of the main piston 15. By means of a positioning or abutment pin 21, which is radially inserted in the forward end of the spindle l2, and which may abut an abutment edge of the spindle nut 10a, an unintentional turning of the spindle 12 out of the spindle nut 10 is prevented.

The main piston 15, which is provided with a sleeve or collar 22, is acted upon by the pressure of the pressure medium prevailing in the high pressure chamber 16, which pressure medium is under a preload to assure a constant pressing effect of the sealing elements. This preload is, during filling of the high pressure chamber 16 with pressure medium, created by means of an oil filler screw 24 (FIG. 5 which is provided with a preloadin'g piston 23, and is constantly maintained by means of the cup spring packet 17 (FIG. 1) which forms an energy storage means.

The pressure increase in the high pressure chamber 16 required for the creation of the clamping force is brought about through a pressure transmitter comprising a primary piston 25 (FIG. 1) and a secondary piston 26. The rod-shaped secondary piston 26 of the pressure transmitter is guided in a groove ring bushing 27 and extends with its forward end into the high pressure chamber 16, so that its displacement results in a change in the pressure in the high pressure chamber 16. With the specific embodiment illustrated in the drawings, the primary piston 25 of the pressure transmitter is acted upon by compressed air, which is supplied to the pressure side of the primary piston 25 through a control bore 28. The pressure chamber of the primary piston 25 is sealed by means of a special sealing piston 29, which is fastened to a support or bearing plate 30 of the clamping carriage 8 by means of a screw 30a.

The supply of compressed air is controlled by means of a crank handle 31, which at the same time serves to mechanically feed the clamping carriage 8. The crank handle 31 is slipped onto a couplling shaft or spindle 32, which is rotatably as well as slidably mounted in the support or bearing plate 30 and in a valve sleeve 34. The coupling shaft or spindle 32 is axially aligned with the spindle 12 and is connected with the spindle 12 by means of a coupling pin 35, which engages a forked spindle head 12a of the spindle 12. The spindle head 12a is provided with an inclined front surface portion 12b. The coupling pin 35 is normally held in the range of the inclined surface 12b of the forked recess (FIG. 2) of the spindle head 12a by means of a compression spring 36, which is arranged between the support or bearing sleeve 33 and the valve sleeve 34. The pressure of this compression spring 36 is conveyed partially to the spring ring 14 and partially by a thrust bearing 37 to the coupling shaft or spindle 32. This thrust bearing 37 is secured to the coupling shaft or spindle 32 by means of a spring ring 38. An additional spring ring 39 in the valve sleeve 34 sees to it that the two race rings of the thrust bearing 37 are held together even with a shifting of the coupling shaft or spindle 32 in relation to the thrust bearing 37.

The valve sleeve 34 has upon its circumference an annular passage 34a which, independent of the position of the valve sleeve 34, is constantly connected with a connecting bore 40 (FIG. 1), which is closed or sealed by a nozzle or mouthpiece 41 for the compressed air connection. The nozzle 41 is provided with a check valve which prevents a drop in the clamping force if, with a clamped vise, the supply of compressed air decreases or fails alltogether. ln unclamped state of the vise, the pressure chamber of the primary piston 25 of the pressure transmitter is in continuous communication with the atmosphere through the control bore 28, the annular chamber surrounding the compression spring 36, and a bore for discharge or exhaust air 42.

To clamp in a work piece, the supporting angle member 10 including the spindle nut 10a is, by means of the pintle or bolt 11, secured to the lower portion of vise 5 in spaced relationship to the fixed clamping jaw 7 and spaced therefrom by a distance corresponding to the respective workpiece. This is done by displacing the clamping carriage 8 with the turned back spindle 12 in such a way that the pintle or bolt 11 may be inserted in that one of the three pintle bores 5b which corresponds to the thickness of the work piece to be clamped. Then, by turning the crank handle 31 clockwise, spindle 12 is turned in the spindle nut 10a, whereby a mechanical positioning of the clamping carriage 8 results. With this mechanical positioning, the spindle 12, which is moved forward, drives the clamping carriage 8 by means of the main piston 15 and the pressure medium found in the high pressure chamber 16. The connection between the coupling shaft or spindle 32, which carries the crank handle 31, and the spindle 12 is effected by the compression spring 36, which sees to it that the coupling pin 35 remains in' engagement with the forked spindle head 12a.

As soon as the work piece to be chucked is positively engaged by the two clamping strips 9 on the fixed clamping jaw 7 and on the clamping carriage 8, the coupling pin 35 in the coupling shaft 32, is, during the further turning of the crank handle 31, pushed up upon the inclined front surface portion 12b of the forked pintle head 12a against the thrust of the compression spring 36 until it engages the abutment surfaces of the forked spindle head 12a. During this relative motion of the coupling shaft or spindle 32 relative to the spindle 12, caused by the cooperation of the inclined front surface portion 12b of the spindle head 12a with coupling pin 35, there results a displacement of the valve sleeve 34 in a direction towards the bearing plate 30. During this displacement the valve sleeve 34 acts upon the coupling shaft or spindle 32 through the thrust bearing 37 and the spring ring 38.

At that moment at which the annular passage 34a of the valve sleeve 34 establishes a connection between the connecting bore 40 and the control bore 28, compressed air is conveyed to the pressure chamber of the primary piston 25. This compressed air displaces the primary piston 25 and the secondary piston 26of the pressure transmitter, so that the secondary piston 26, which is sealingly guided in the groove ring bushing 27, enters the high pressure chamber 16 of the primary piston 15. According to the transmission ratio of the pressure transmitter, there will be obtained an increase in the pressure in the high pressure chamber 16. This increase in pressure brings about that the clamping carriage 8 is displaced relative to the main piston in the clamping direction by fractions of the high pressure stroke. In this connection the main piston 15 rests against the spindle 12 by means of pin 15a, which in turn is supported by a spindle nut 10a and the supporting angle member 10 in the lower portion of the vise 5. In clamped state of the vise, the coupling pin 35 abuts the abutment surface 12c above the inclined front surface portion 12b of the spindle head 12a. The coupling shaft or spindle 32 remains in this position, so that a constant communication of the pressure chamber of the primary piston 25 with the supply of compressed air is assured through the valve sleeve 34 remaining in its position.

To be able to take the clamped-in work piece out of the vise, it is necessary first to reduce the applied clamping force and subsequently to pull back the clamping carriage 8 to suchan extent that the work piece may be taken out from between the clamping strips 9. For the reduction of the clamping force, the crank handle 31 is turned counter-clockwise, whereby the coupling pin 35 is lifted off from the abutment surface 120 of the spindle head 12a and is returned over the inclined front surface portion 12b of spindle head 12a to the bottom of the forked spindle head 12a. This movement is aided by the compression spring 36. In this connection the compression spring 36 simultaneously brings about that the valve sleeve 34 is displaced beyond the control bore 28, so that the pressure chamber of the primary piston 25 is shut off from the supply of compressed air and is connected with the outside air through the control bore 28, the annulus surrounding the compression spring 36, and the bore for the discharge 42. With reduced pressure in the pressure chamber of the primary piston 25, the primary piston 25 and with it the secondary piston 26 are returned to the starting position, whereby also the pressure in the high pressure chamber 16 is reduced down to the preloading pressure. Then, by a further counter-clockwise movement of the crank handle 31, the spindle 12 is turned back by means of the coupling pin 35. In this connection the spindle 12 supported in the spindle nut 10a takes with it the clamping carriage 8 through a flange or collar 12d, the guiding sleeve 13 and a spring ring 14, so that the work piece will be released.

In order, during the clamping of work pieces having deformable fins or burrs or of a plurality of not completely flat work pieces which rest one upon the other, for instance, a bundle of sheets or laminations, to be able to mechanically apply a preloading by positioning of the spindle, it is necessary to switch off the power operation which automatically occurs with the clamping carriage 8 engaging the work piece. For this purpose the coupling between the spindle 12 and the coupling shaft or the spindle 32 may be blocked or locked by displacing the coupling shaft or spindle 32 in the direction toward the spindle 12 by means of the crank handle 31 against the force of a return or restoring spring 43, which is arranged between the spindle 12 and the coupling shaft or spindle 32 according to FIG. 1. In this connection the coupling pin 35 moves into the recess 12e (FIG. 2), which is arranged below the inclined front surface portion 12b in the spindle head 12a. During further turning of the coupling shaft or spindle 32, by means of the crank handle 31, the coupling pin 35 situated in the recess 12e cannot reach the inclined front surface portion 12b of the spindle head 12a, so that no axial displacement of the coupling shaft or spindle 32 results, which otherwise would result in a supply of the compressed air. As soon as the necessary preloading force is obtained, the operator no longer exerts the axial pressure upon the coupling shaft or spindle 32, and the return or restoring spring 43 then moves the coupling shaft or spindle 32 with the coupling pin 35 to the normal position, in which, with the further turning of the crank handle 31, the above described addition of the power operation is automatically effected.

It is, of course, to be understood that the present invention is by no means limited to the specific showing in the drawings but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. A power operable vise which comprises: supporting means, first clamping means fixedly connected to said supporting means, a "clamping carriage movably connected to said supporting means and including second clamping means, a threaded spindle rotatably mounted in said clamping carriage for moving the latter relative to said first clamping means, fluid operable clamping pressure amplifier means connected to said clamping carriage for exerting fluid pressure upon said clamping carriage in the direction towards said first clamping means, said amplifier means including a high pressure chamber in said clamping carriage for receiv-' ing amplified pressure fluid, valve means arranged within said clamping carriage for controlling the supply of pressure fluid to said amplifier means, piston means reciprocably arranged in said high pressure chamber, a coupling shaft rotatably mounted in said clamping carriage and in substantially axial alignment with said spindle, clutch means for selectively interengaging and disengaging said spindle and said coupling shaft with and from one another, crank handle means for rotating said coupling shaft, and means associated with said coupling shaft and said spindle for permitting an operator to axially shift the coupling shaft thereby to delay the disengagement of said spindle and said coupling shaft from each other to thereby delay the activation of said amplifier means.

2. A power operable vise according to claim 1, in which said means for the operator to delay the disengagement of said spindle from said coupling shaft includes a coupling pin engageable by said coupling shaft, a forked spindle head on said spindle engaged by said coupling pin, said spindle head being provided with an inclined front surface portion and a recess, and a compression spring continuously urging said coupling pin towards said spindle head.

3. A power operable vise according to claim 2, which includes spring means arranged within said spindle head and interposed between a portion of said spindle head and said coupling shaft for permitting an axial movement of said coupling shaft relative to said spindle.

' STATES PATENT OFFICE 3,829,075 Dated August 13, 1974 Gerhard Dziuballe et a1.

Patent No.

Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet insert w 130] Foreign Application Priority Data September 21, 1971 Germany 2146995.4

Signed and sealed this 19th day of November 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. Attesting Officer C. MARSHALL DANN Commissioner of Patents FORM PO-1050 (10-69) U5coW-Dc 0374;.p59 u.sr GOVERNMENT wmnmus OFFICE: 930

Claims

1. A power operable vise which comprises: supporting means, First clamping means fixedly connected to said supporting means, a clamping carriage movably connected to said supporting means and including second clamping means, a threaded spindle rotatably mounted in said clamping carriage for moving the latter relative to said first clamping means, fluid operable clamping pressure amplifier means connected to said clamping carriage for exerting fluid pressure upon said clamping carriage in the direction towards said first clamping means, said amplifier means including a high pressure chamber in said clamping carriage for receiving amplified pressure fluid, valve means arranged within said clamping carriage for controlling the supply of pressure fluid to said amplifier means, piston means reciprocably arranged in said high pressure chamber, a coupling shaft rotatably mounted in said clamping carriage and in substantially axial alignment with said spindle, clutch means for selectively interengaging and disengaging said spindle and said coupling shaft with and from one another, crank handle means for rotating said coupling shaft, and means associated with said coupling shaft and said spindle for permitting an operator to axially shift the coupling shaft thereby to delay the disengagement of said spindle and said coupling shaft from each other to thereby delay the activation of said amplifier means.