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Publication numberUS2615373 A
Publication typeGrant
Publication dateOct 28, 1952
Filing dateFeb 2, 1950
Priority dateFeb 15, 1949
Also published asDE809879C
Publication numberUS 2615373 A, US 2615373A, US-A-2615373, US2615373 A, US2615373A
InventorsPegard Pierre
Original AssigneeG S P Soc Atel
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety stopping device for movable machine-tool members
US 2615373 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

'Oct 28, 1952 Y P. PEGARD 2,615,373

SAFETY STOPPING DEVICE FOR MOVABLE MACHINE-TOOL MEMBERS Filed Feb. 2, 1950 I/V VE N TR P//efef Pim/w B HTTORNEY Patented Oct. 28, 1952 Pgard, Courbevoie, France SAFETY sToPPING DEVICE 'ronMovABIbel i MAcHrNEmooL MEMBERS l Application February 2, 1950, Serial No. 141,888v In France February 15, 1949 3 Claims. 1

This invention relates to safety devices, and more particularly to safety devices for preventing a. movable member such as a traversing table of a v`machine tool or the like from escaping from its slideways or tracks while moving at high speed in the event of its drive means being accidentally disengaged.

In machine-tools such as planing machines which include movable members or tables which in operation assume high-speed reciprocating traverse movements, the means for reversing the motion of the table at the end of its traverse are usually supplemented by a safety stopping device acting by electrical or mechanical braking effect. It can often occur that this safety stop device fails to operate, either because of a failure in :electric power or due to misadjustrnent of the control stops thereof, or for any other reason. The movable member willl then, under the mof fx'nentum built up during its displacement, continue on its movements, and the driven element, such as a rackbar for example, may disengage :and escape from the pinion constituting the driving element. Said movable member can then be shot out of its slideways at high speed and cause accidents.

It is an essential object of this invention to avert such accidents and for this purpose to ycause a gradual breakage of the movable part to 4bring it completely to a stop, over a distance short enough to prevent said movable part from leaving its slideways.

With the above and other objects in view the invention essentially consists of taking up the` kinetic energy stored in the moving member as soon as said member first becomes disengaged -from its drive, byusing said energy to draw a improved safety device and the pertinent fragmentary parts of the planer; and Fig. 2 is a transverse cross-section on line II-II of Fig. 1.

As shown, the table I of the planer is movable over the slideways II of the planer frame 2. The

f table I is provided with a stop 3 adapted, in the event the table would overrun its normal traversing stroke, to abut against a part l rigidly secured to a bar 5 of circular cross-section. The bar 5 is formed towards the end thereof opposite from that engaging the part 4, with an enlarged diameter section which merges with the smaller diameter section of the bar through a frusto conical section 8. The bar as shown extends through a ring 6 made of very hard steel acting as a drawing-die. The ring 6 is backed against a support 'I which in turn is backed against a shoulder 9 of a machined section of the frame. To prevent the part 4 from being overturned, said part is supported as shown more clearly in Fig. 2, on two ribs I0 formed on the frame.

The above-described device operates as follows: should the table I fail to stop normally at the end of its traversing stroke, its stop 3 will engage the part 4 and carry it with it. The bar or rod 5 is then drawn through the die member 6. The draft force necessary to thus draw the bar through the die produces the desired braking action and brings the movable assembly to a stop. The provision of the frustoconical connecting section insures that the `braking action is satisfactorily gradual. Another advantage of this frustoconical section is to avert a sudden shock from occurring as the stop 3 engages the part 4.

After the safety device has operated, of course an exceptional occurrence, the bar 5 is replaced byanew one.

Rather than the specific arrangement shown, a reverse disposition could be used, with the dieand-bar assembly provided on the movable structure, and the stop 3 on the fixed frame.

The structural details illustrated and. described have been given for indicative purposes only, and various modifications may be made therein, as in the relative shapes, sizes, and materials ofthe various part without exceeding the scope of the invention as defined in the ensuing claims.

WhatIclaim is:

1. In a machine tool of the type including a carriage arranged to reciprocate between two limit positions, a safety device for yieldably arresting said carriage when overrunning one of its limit positions, a safety device for yieldably ara stationarily mounted die member, a drawable bar having a portion fitting through the opening of the die member and a portion wider than said opening, the fitting portion of the bar being extended through the die opening, a first dog fixedly secured to said fitting portion, and a second dog secured to said carriage for movement in unison therewith and engageable with said first dog, engagement of the said dogs forcing the wider bar portion through the die opening thereby vyieldably arresting the carriage, the said dogs being disposed in a relative position in which they are engageable ...for the.,v purpose aforesaid only when the carriageoverruns one of said limit posi'- tions.

2. A machine tool as defined in claim 1, wherein I said wider portion of the metal bar is frusto-cone shaped, the narrow end of said frusto-conicall shape being joined to the said tting portion of'-lv the bar.

3. A machine tool as dened in `claim l', wherein 4 REFERENCES CITED The following references are of record in the le of this ipatent:

UNITED STATES PATENTS Nunibier, y, A y. Name I .l Y, Date 382,729' Pirelsticker 1; ,May 15, 1888 1,951,073 Wallis Mar. 13, 1934 Y 2,161,820 Kessenich June 13, 1939 10 '2,275,573 Strum et al Mar. 10, 1942 f FOREIGN PATENTS Numberl Country I Date I,18,131 Great Britain 1912 the said die member is stationarily mounted on l,

the machine tool.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US382729 *Sep 5, 1887May 15, 1888 Stickee
US1951073 *Feb 3, 1932Mar 13, 1934Nat Tube CoTube drawing apparatus
US2161820 *May 10, 1938Jun 13, 1939Gregory J KessenichShock absorbing device
US2275573 *May 4, 1940Mar 10, 1942Aluminum Co Of AmericaEnergy dissipating or shock absorbing unit
GB191218131A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2682931 *Mar 3, 1950Jul 6, 1954Young Victor MMeans for absorbing energy due to sudden impact
US2857056 *May 2, 1955Oct 21, 1958Gen Motors CorpCoupling assembly
US2877170 *Aug 24, 1955Mar 10, 1959Long EverettSupport device for use in a nuclear reactor
US2997325 *Sep 15, 1959Aug 22, 1961Peterson Gerald HKinetic energy absorber
US3006484 *Oct 12, 1959Oct 31, 1961Cockerill Ougree SaDevices for railway vehicles designed to withstand longitudinal buffering stresses
US3059966 *Nov 4, 1959Oct 23, 1962Aerotec Ind IncEnergy-absorbing means
US3096268 *Jun 14, 1957Jul 2, 1963Atomic Energy Authority UkArresting devices for falling bodies
US3097725 *Sep 2, 1959Jul 16, 1963Peterson Gerald HKinetic energy absorber
US3171511 *Mar 23, 1961Mar 2, 1965Cross CoPositive stop for machine tools
US3706359 *Sep 25, 1970Dec 19, 1972Omark Industries IncEnergy absorbing structures
US3714859 *Sep 18, 1970Feb 6, 1973Omark Industries IncEnergy absorbing structures
US3715137 *Sep 18, 1970Feb 6, 1973Omark Industries IncEnergy absorbing structures
US4056036 *Mar 17, 1976Nov 1, 1977Bergwerksverband GmbhBorehole anchor
US4346795 *Jun 23, 1980Aug 31, 1982Harvey Hubbell IncorporatedEnergy absorbing assembly
US4536112 *Sep 22, 1982Aug 20, 1985Oerlikon-Boehringer GmbhProtection device against overloads in a machine
US5517886 *May 3, 1994May 21, 1996Dainichi Kinzoku Kogyo Co., Ltd.Centering device having work rest control responsive to carriage detection means
US5586478 *Mar 20, 1996Dec 24, 1996Dainichi Kinzoku Kogyo Co., Ltd.Centering device having work rest control responsive to carriage movement
US20040001742 *Feb 28, 2003Jan 1, 2004Armin BornemannMachine tool comprising a braking apparatus for a machine part
DE1117396B *Mar 30, 1960Nov 16, 1961Cleveland Pneumatic Ind IncFahrwerk fuer Flugzeuge mit Stossbeanspruchungen aufnehmenden Mitteln
EP0075333A1 *Sep 22, 1982Mar 30, 1983Oerlikon-Boehringer GmbHArrangement preventing machine tool overloading
WO1983001030A1 *Sep 22, 1982Mar 31, 1983Horsky, AntonProtection device against overloads in a machine tool
Classifications
U.S. Classification409/220, 188/1.11R, 409/134, 213/1.00R, 82/153, 213/1.00A, 188/67, 60/915
International ClassificationB23Q11/00, B23Q16/00, B23Q5/58
Cooperative ClassificationB23Q5/58, B23Q11/0092, Y10S60/915, B23Q16/001
European ClassificationB23Q11/00G8, B23Q5/58, B23Q16/00C