US1193318A - veltum - Google Patents

Description

R. E. VELTUM.

PNEUMATIC TOOL.

' APPLICATION FILED OCT. 24. 1914 y: I 1 19mm, PatentedAug. 1,1916.

51 mm Mm; f? I wm (git/J? m wwwag R. E. VELTUM.

PNEUMATIC TOOL.

APPLICATION HLED OCT. 24. 1914.

ii. 11 $55 331 & Patented'AugE 1, 1916.

1 2 SHEETS-SHEET 2. flfilyz'yn ROBERT E. VELTUM. OF EUGENE, OREGON.

PNEUMATIC TODL.

lawman Specification of Letters Patent.

Paienied Zin i 391 6.

Application filed Dctober 24. 1914. Seria No. 868,460.

iie it known thal I. Rom-arr idoi'iciircxi. a eitizen of {he inited States. residing in Eugene. in the county of Lane and State of Oregon. have invented certain new and useful improvements in lneuiuatie Tools. ol which "ihe following is a speeilieation.

The oh ieet of this invention is to furnish an improved portahle lool. operahle hy compressed air or other fluid under pressure. whereh an oscillating molion ol' the working? head is produced. so that the machine is suiiiahle for grinding Yal\'e operating a rat het drill. or other purposes requiring a rapid {wand-fro moti n. For aeconiplishing ihis oli ieii two areuale oi'liuders are pro- \ided. with a piston in eaeh. hoth pistons being connected io a common driving sha'l'i; and oppositely arranged. so that when one piston isat' one end o'l' its stroke the other is at the other end of its stroke. wherehy impulses in opposite directions are given alternately to ihe shal't. A. suital le \alvcmechanism controls the lluid supply so as to produce. the reversal of movement of the pistons at the proper limes.

in the aei'ronipanyinir drawings. Figure 1 is an eici'ation ola nap-hinc emhodying the invention. hie. L is a top view of Fig. 1, Fig. 2% is a \ertieal central section through the machine ol Fig. l. on a iar ereeaie. Fig. --l is a top View of one of ihe ineinhcrs of he machine in which one of the ey'linilers is partly formed. Fig. 5 is an elevation of the. ihiringr shaft and the pistons connected therewith. Fig. 3 is a top riew oi" the pisstons. sha'l't and eonneeling rods. Fig. 7 is a side. View of a part of the vali'ceontrolling devices. Fig. 2 is a vie at a right angle to Fig. 7. Figs. 1) and it) are details of the valve. hie. 1U heing a section on line i0-10 of Fig. 1). ulh'. Figs. ll and 12 are details of one of the pistons.

Similar reference characters indieale the same parts throughout the figures.

Referring to the drawings. the main-hioek 1!) ol' the tool has therein two areuate grooves .l l. 12. one at the front face and one at the rear face of the same. The frontplatc 13 has at its rear face a corresponding groove 14'. and the rear-phite 153 has a C(iTl'Qf-lpUDdlIlg gro ve .16., said grooves forming when the )laies are secured in. place on the main-- hlo k. areuatc channels of cylindrical cross secilm, each extending nearly the full cirhloek.

Jsoi' like curved form and extends in the cylinder 2-3 in like manner, a distance greater eu miierenee of a circle. as shown in Fig. 4. Screws 4;! of which one is shown. secure tho plates and main-hloek together.

drivingshalt 17 is journaled at its inner end in a socket in in the rear-plate l5, and extends through a central opening 32 in the hloek l and is journaled in a hearing i in the front-plate 13. it extends i'orwardl heyond the front-phite and at its outer end is provided with a ('lumpingI-soeliei it having. a screw 21. wherelr'v an desired worktop] can he secured to the shall.

In the front eylinder '12 is located a piston 33. and in the rear cylinder QB-i is located a piston 23. Caeh piston eomprises a head iii. a eupshaped washer liof leather or other suilahle material. and an expansion spring. 28 within the eup-shaped washer. The head 213 is secured at the end ol a connecting rod which extends forward heyond the h ad and is sere\\'-threaileil and receives a nut 21) by "which the piston washer 27 is retained in place against the h *ad. The eonneeling rod :10 of the. piston extends therefrom in the cylinder 24 for a grea er distance than the length of the stroke of the piston. and is then hent at an angle and connected at its inner end with the shaft 17. In order to reach said shaft. the rod passes through a siot 31 which is formed between the main hloek it) and the rear plate 15 h cutting: awa) a portion of the metal of each hetween the cylinder 16 an'd the central opening 32 of the main The connecting rod 35 of piston 23 than theclengjth of the stroke of the. piston. and then extends inwardly through a slot 33 to the driving shaft 17. The two pistons arc oppositely disposed, that is to say, they are oppositely directed in their respective cylinders and so located that when one is at one end of its stroke, the other is at the other end of its stroke- The air supply duct 36 is located in the rear plate 15 and connects with a corrcsponding duct- 37 in the main block 10, which communicates with a valve-chest 38 in said main block. From said valve-chest 38 extends a duct 35) to the cylinder 22, and a duct U. to the cylinder 24*. A main exhaust, channel 42) extends from the valve-chest to the outside of the block. In the valvcchcst is located a valve i of circular form, and having a recess 45 in which is located a finger 46 which is secured to the end of a valve stem ,47. The valve stem extends in the main block to the central opening a .the same, and is there provided with a knuckle 48 having an antifriction roller 49 located in the path of two pins 50, 51, respectively, which extend radially from and are spaced apart upon the shaft 17. The valve is provided with a port 52 adapted to place the valve-chest 38 in communication with one of the supply ducts to one of the cylinders, and with a port 53 adapted to place said valve-chest in communication with the supply duct for the other cylinder, and with a duct 54 for making, the proper connection of either of said air-supply duets with the main exhaust duct 43,.the ducts 39 and 41 servin alternately for inlet and exhaust. A plate 05 closes the valve-chest 38 at the outside of the main block. A fiat spring 56 between said plate and the valve retains the valve properly seated in the valve-chest, and gives suilicient friction so that it holds whatever positoin it may be given by the finger 46. The valve is provided at itsperiphery with a recess 72. An abutment projects from the main block ll) into said recess and limits the movement of the valve in either direction. A pawl is provided for properly locating the knuckle at each time that the latter is thrown by one of the pins 50.51, and for assisting; in the movement of the knuckle and valve. Said pawl comprises a main member 57 sliding in an opening in the rear plate 15 and guided therein by aslot and pin 58, and carrying at its knuckleengaging end an antil riction roller 5%). A

compression-spring 60 bears inwardly upon the member 5 and is itself capable of adjustment as to pressure by an adjusting screw (31 having its head exposed at the utside'of the rear plate. A throttle-valv (i2 is provided on the rearplate 1:), whereby the supply of air passing through the duct 36 .may be readily controlled. A handle (14 extends rearwardly from the rear plate and is provided with a duct communicating, with the duct 36. A swivelconnection ($6 at the rear end of the handle permits the attachment of the hose 67 by which the compressed air or other motive fluid may be supplied to the machine.

in Fig. 1, the valve isshown in median position. In operation, the valve being for example atone end of its motion. the port 53 is in register with the supply duct ilSHmd permits air to flow from the valve-chest 38 to cylinder 22, and move the piston 23 in driving direction therein. At the same time piston 25 is being moved on its return stroke in cylinder 24, and the air in front of the same is escaping through duct 41, exhaust duct 5- of the valve, and exhaust. duct 43 .in the main-block 10, to the atmosphere.

Motion of the pistons and of the drivingshaft continues until pin 51 strikes roller 4Q. of the valve-tripping device, and moves the knuckle 48 so that the high point 70 of the same passes under the roller 59. The pawl then by pressure on the knuckle, throws it quickly to the limit of its movement and retains itthere. During the first part of the knuckle movement, when itis impelled by the pin 51, the finger l6 plays of the machine by the adjustin -screw (31.

In the new position of the valve, port 52 is'in register with duct 41 leading to cylinder 24, whereby air is permitted to pass from the valve-chest to the cylinder 24 and drive the piston forward. At the same time exhaust escapes from cylinder 22 through duct 39, valve-duct 54 and exhaust duct 43 to the atmosphere. Near the end of the stroke, pin 50 engages roller 49 of the valve-tripping device, and the valve is tgain thrown in the manner before described, but in opposite direction, into the position first assumed. The admission of air alternately to both cylinders, and exhaustion of the same therefrom, and the resulting rapid motion of the pistons and driving-shaft, first in one direction and then in the other continues until the supply of air or other driving-fluid is cut oil. The speed of the tool may be reduced whenever desired by screwing down the throttle-yalve (52, whereby the air-supply duct 36 is partially closed, or may be inv creased from a low speed to full speed by but is not limited to these uses, and may be employed for any and all purposes requiring that the working tool be given a rapid oscillating motion.

The invention is not limited to the particular structure described, but changes "may be madev thereinwithout departing from the spirit of the invention as set forth in the appended claims.

I claim: l c

l. A portable motor comprising a main block having two arcuate cylinders, oppositely disposed pistons within said cylinders, so that when one is at one end of its work- ,haust duct.

chest adapted to be oscillated, and provided with inlet ports adapted to alternately register with the said inlet ducts, and an exhaust port adapted to alternately register with said ducts and said exhaust port, and means for oscillating the said valve. 2. A portable motor comprising a main block, having two arcuate cylinders, oppositely disposed pistonswithin said cylinders, so thatwhen oneis at one end of its working stroke, the other .is at the opposite end of its working stroke, a shaft adapted to be oscillated by the working of said pistons, and radial projections on the said shaft, a valve chest on'said main block, means for supplyingair to said valve chest, d lcts from said valve "hest to said arcuate cylinders adapted to alternately supply and exhaust air into and out of said cylinders, an exa valve within said chest adapted to be oscillated and provided with inlet ports adapted to alternately register with said inlet ducts to supply air to the cylinders, an exhaust port adapted to register with said ducts and said exhaust duct to exhaust air from the said cylinders, and a valve-sten1 adapted to be alternately enon the main block,

block leading to the gaged by the projections of the said oscillating shaft, to oscillate the said valve.

3. A portable motor comprising a main block having a central opening, a front plate and a rear plate, a shaft in said opening journaled in said front plate and rear plate, meansadapted to be alternately operated to oscillate the said shaft, an air valve mounted to oscillate on the main block, and having a stem extending to the central opening of the said main block, a valve tripping (lento vice in said opening adapted tooscillate said valve-stein, an air-supply duct in the main said valve, ducts from the valve to-the said means for oscillating the shaft, an exhaust passage from the valve to the outside of the main block, means on the rear plate for regulating the supply of air through the air-supply duct therein, a

handle extending rearwardly from the rear plate, and having an air conduit connecting with the air-supply duct of the rear plate, a swivel hose coupling at the end of the handle, a tool clamp on the exposed end of the shaft, and detachable means securing said main block, front plate and rearplate together in operative alinement.

In testimony that I claim the foregoing as my invention, I'have signed my name in presence of two subscribing witnesses.

ROBERT E. VELTUM.

\Vitnesses:

Louis E. BEAN, 'AnLoNE ROCKWELL.

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