US1826445A - Safety device for grinding machines - Google Patents

Description

Oct. 6, 1931. H. E. BALSIGER 1,826,445

SAFETY DEVICE FOR GRINDING MACHINES Filed June 13, 1928 2 Sheets-Sheet 1 IN V EN TOR.

MEOLD E. EELS/GER.

BY W A TORNEYS Oct. 6, 1931. H. E. BALSIGER 1,826,445

SAFETY DEVICE FOR GRINDING MACHINES Filed June 15, 1928' 2 Sheets-Sheet 2 INVEN TOR. H/IQOLD E. BflLS/CDE ATTORNEYS.

I P a tentecl' Oct. 6, 1931 S ATE PATENT "OFFI I nimonnn. nALsIGnnQOr wAYnn'sBOno, PENNSYLVANIA, Assreivon ro nannis TOOL COMPANY, OF. wavnnsnono, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA 1 ssrn'rv nnvrcs Ron 7 I 7 Application fled sums,

I This invention relatesto safety devices for use with anhydraulically operated work rest 'on grinding machines, and particularly crank grinding machines.

Itisan 'object'of the invention/to provide I a safety means whereby the work carriage on the grinding rmachine cannotz. be traversed the work. no

I. While. the work rest-is imposition .to support A furtherlobject is to' provide safety combination of'the' above character, an automatic pressure operatedxfiuid-by-passvalve.

A further generalobject istoprovidela 'fsafetydevice-in grinding machines Orthe like to themachine;

which will require as little attention from an operator. as possible without danger of injury Further. objects advantages. be;

7 come apparent. as" the description proceeds.

; 7. Referring to. the accompanying drawings,

' I which are-made apart hereof and on which jthegby-pass valve; and; y 12 Figure 3 'isa sectional elev similarreference characters indicate similar I parts ure 25 v;

llis a partial end elevation; partly in sectioniof acrank grinder equipped vwith a stationary hydraulic back rest, and showing I the, safety device its relation to the ;grinder,

2-is asectional front elevation tionlof the pisvitoii;which operates the work rest.

The crankgrinding machine of which liniusntion is here shown as forming apart, is g the machine described in a co-pending application of Amos Rsteiner, Paul Stonerand "Charles P. Harrison, s;erial No. 126,583,'fi1ed August 2, 1 926, for crank grinding machines,

' jandythe back rest is that described in the application of Amos P. Steiner and Harold E.

Balsiger, Serial No. 143,248, filed October 21,

- V 1926; for jhydraulic back rests for grinding "machines The grinding machine; and the back rest will therefore be described only insofa'r'as is'necessary to understand the'appli- 'cationof 'the' control device to these machines.

f Intherdrawings numeral 10 indicates the base of a grinding machine having a travers- -abltarriage11 slidably mounted'in suitable, -1guideways thereon. Thetraverse-carriage is GRINDING. rmonnvns 1928., Serial in. 285,113.

reciprocated by means of a rack 12 mountedthereunder, which is driven by a suitablepinion 13 which pinion is operated bym eans of an oscillating motor 14. The motor is driven by pressure fluid delivered thereto througha pipe 15. The work 16 is mounted in a *well' known way upon the traverse carriage in p0 sition to be moved to grinding position before an abrasive wheel 17. The work rest (1011-, 'sists of a back rest bracket'18, secured upon the-base of the machine, A slidable member 19 carrying a Work engaging jaw 20 is moved toward and from working position by means of a pinion 21 engaging the rack teeth 22- on the lower part of the slide 19. 7 A small pinion 23 is connected to the large pinion 21 and is driven by means of rackteeth 24: on a piston rod 25. The piston rod carries on its lower end a piston 26which moves in a cylinder27.

sages to, the cylinder 27.. A reversing valve 30'admits pressure fluid selectively below or above the piston 26 to move the work engaging vjaw lto operative position, or withdraw it from operative position. A lower work engaging jaw 31 ispivoted at 32 and is moved to operative position by means of a plunger 33 which is connected to a plate 34 secured to theback rest slide-19. The details of the re versing valve 30have not been shown because any conventional structure for admitting fluid above and below piston 26 and for exhausting fluid from the cylinder 27 be used.

Connected with a chamber above-the pis- 7 ton 26 in the cylinder 27 is a pipe35. This pipeconnects with a by-pass valve shown as a whole at 36, and which forms the control or safety feature of the invention. The details of this valve will now be described:

I The valve comprises a valve casing37 having'a double piston 38 and 39 reciprocably mounted in a bore therein. The piston 39 is longer than the piston 38, and is provided with a flange 40 which engages a shoulder in the cylinder valve body to limit the movement of the valve in one direction. A cap 41 is screwed intothe end of the valve casing and has a hole 42 therethrough, into which is threaded a-connection on the pipe 35. A53

shown in Figure '2. one end of the bore in the casing 37. This A cap 45' closes] {cap haswan adjiisting screw 46 threaded ii 'spring43. The valve casing is pr ovided'with therethrongh and engaging the disc 44 to provide means for adjusting the tension of the nl t police anda discharge PQ'IH A.

I pipe 49 conne'ets the dischargefport with suitable connections leading. toythe reservoir in the base of the grinding machine, not shown,

; 15 I I byjmeans' of ashort'pipe 51 wi'th the'pipelt') 'whichfsupplies motive fluid to'the oscillating A relief port provides-for leakag'e of fluid past the piston 38, ,The port 4'1 is connected motor "*T eitension ofthe $Pring43is su'clithat it requires greater pressureto operate theby-pa'ss valve'than the work resti I The valve will therefore 'no't be operated while thebackrest isbeing withdrawn','n or ti t e Pi tQ ihQ ew ey .lwer q t I 'o'sition. j

I Pv H, r

" The operation of thef deviee as z" 7 hen the piston 26 isjin thefabove. position .shown in fnll lines in Figure 1, thefchamber above thefpiston is open to the high pressure withthe high pressure fluid Chamber delivers shown in Eigiire against .the tension'of the spring 43.: Thislfho'lds'the plnn'gerin'the position shown in full lines 'in Figure 2, and

I elosesjoommunication; between theipor't-s 47 I and 48." High pressure finid in the pipe line 1 5 will thereforeb e delivered"t6 the osoillat ing. motor to drive the traversing earri'a'ge 11. Whe mjhowever'," the reversing velveso has'beef'n moved to admit high 1 pressure fluid to move the back rest toioperzttive pes i;

ition inglengagement with theflwork 16, ;as s own i d t d, l s Fig re a When i below the piston26 andto exhaust itfabioye the'piston 2 6, the pistonfwill be' moved; up-

I the reversing, valve in this position, pres} sure fluid is" allowed to exhaust through the L jatjtheriglit of theflange'40' an 'the'piston .39

i and allows the spring143 to move the pistonto' reversible valve 3O t thepipe' 29. This shift ing of the reversing valve .relieves pressure 1 the position shown'in dotted lines in 'Eignre 2.

, to traverse the work earriage, while the sta- -;:High pressure fiu'id "from the pressnre :lines 15 will then escape" thro igh the pipe 5-1, the

enders tionary back rest is in a position to support.

the! work. ril advantagesl'oi the device in" contributing a step'toward makinga' machine it will be obvionsto those skilled in the art that various changes may be'made in my device withoutdeparting from the; spirit'of the invention, and I, therefore, do not limit myself to what is shown in the drawings and d ed n h Specification,-bnt-onlya t forth in thefappnded'claims:

r Having thus fully described my said inwh eel,means for reeiprocating the work oar-- ria'ge,means formoving the work rest to and from operative position, and means; con trolled by the movement "of said work rest to render the said carriage reoiprocating'means operative oninoperative, substantially as {set forth.

2. n a, grinding families were hy drama-any operated workrest and a hydranlically traversed work carriage, means" for traversing the work Carriage, and means icontrolle bv movement of the wo kjestfer yen:

dering the said traversing imeans j oper'ative o .o o i n ti eisv s n iall 'as Serena; ff fln d l ne 28; The p pe 35 in eommumc'ation I '7 f s m-thr ugh thepassag '4 i fiih s ,end of thelpiston'39ito force .it'tofthe'left, as

8. "In, afgrinding'mfi ihine a worlijearriage',

as set forth. i

" In grinding h n avbrkearfia'el,

a motor for traversing said carriagedahigh pressure motive fluid line, connected I to Y said m by-We ral e' sa d' nei'e' iverk rest, hydraulic mea'nsifor moving said back rest into and ont of onerative position, and connections from saidp'hvdraiilie' Ineans to said by-pass whereby 'hy passgwilh be opened when saidwork rest is {in operative work e ei ispef itidng S t nt al y as forth. a 7 e H 5. 'In'combin'ation ing a hydranlieally operated workjrest," a

hydranlic carriageltraverse, and. interconnected means to prevent traversal of the work carriage when'therwork rest is either motionor is in operative poos'ition,substantiallv I "as setforthi. ports 47, 48 and ,outletpassage 49, toa reserv oir in'thebase ofthe maehine. This relieves thepres'sure in thepipe line 15 and r the traversing motor 14 inoperative." This 60 provides asafetyagainst accidental attempts hydraulically operated, {carriage traverse,- a

work rest, fluid" connection fromsaid work a grindinginac'hine 11537 r In combination ca?grindingjmaehiiie, a v

rest to said by pass valve whereby-said byv morenearly fool-proof shouldib'eapparent. pass' will open whenthe pressur'eis re'leased' onone side of the pistonpsubstantially as set forth.

7 .In combination a grinding machine, a

hydraulically operated carriage traverse, a

source of pressure fluid, a by-pass valve in the pressure line between said traverse opera ating means and saidsource of pressure, a- Vrfluidpressure operated piston for operating the Work rest, fluidconnection from said Work rest to said by-pass valve, Wherebysaid' by-pass will close when pressure is exerted ;1 on one side of the piston, substantially as set 'forth.

7 t 8. Ina" grinding machine a hydraulically I, operated work rest, aihydraulically operated r carriage traversing mechanism, a high pres- 7 sure fluid line froma source of pressure fluid for operating the said Work rest and the said traversing mechanism, a by-pass valve in said high pressure fluid line, a connection between the said Work rest and the said valve whereby pressure fluid is directedto the carriage trav- 4 1 ersing mechanism orjis by-passed from the v a high-pressure fluid line depending on the position of the Work rest, substantially as set v I forth. r

I In Witness whereof, I have hereunto. set 'my hand at Waynesbo'ro this 8th day of J U116, 33" D. nineteen hundred and'twentv eight.

HAROLD, E; BALVSIGER;

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