US2338157A - Controlling device - Google Patents

Description

Jan. 4, 1944. R. o. ALLEN CONTROLLING DEVICE Filed Feb. 5, 1942 9 2 Sheets-Sheet 1 INVENTOR 1? OZIZZen F; a s AITORNEY.

Jan. 4, 1944. R. 'o. ALLEN 2,338,157

CONTROLLING-DEVICE Filed Feb. 5; 1942 2 Sheets-Sheet 2 HIS A'I'ITORNEY- thereto,

Patented Jan. 4, 1944 UNITED STATES PATENT "err r-ca CONTROLLING DEVICE Roy 0. Allen, Athens, Pa., assignor to Ingersoll- Rand Company, New York, N. Y., a corporation of New Jersey Application February 5, 1942, Serial No. 429,607

1 Claim.

This invention relates to fluid actuated tools, and more particularly to a controlling device for a fluid actuated riveting machine of the percussive tion and in which similar reference numerals refer to similar parts,

Figure l is a longitudinal side elevation of a riveting machine having the invention applied Figure 2 is a longitudinal elevation, partly in section, of a riveting machine embodying the invention and showing the power unit of the riveting machine in one of its limiting positions and taken through Figure 1 on the line 2--2,

Figure 3 is a transverse view taken through Figure 1 on the line 3--3 showing a detail,

Figure 4 is a view similar to Figure 2 showing the power unit of the riveting machine in position for upsetting a rivet,

Figure 5 is a transverse view taken through Figure 2 on the line 5-5, and

- port the work 2|. An arm 25 of the bracket 23 extends into the path of the riveting machine and contains an anvil block 26 having a recess 21 to accommodate the pre-formed head of a rivet 28 extending through the work 2|.

The riveting machine 20 may be of a known type and comprises, as casing parts, a cylinder 29 and a head block 30 threadedly connected thererivet set 33 supported by a holder 34 the stem 35 of which extends slidably into the, front end of the cylinder to receive the blows of the ham-' mer piston 32. The holder 34 is yieldingly held in position to receive the blows of the hammer piston by a tool retainer 36 in the form of a coil spring threaded upon the forward portion of the cylinder 29 and having an end coil 3'! acting as an abutment for an external shoulder 38 on the holder 34.

A valve 39 is arranged in the head block for distributing pressure fluid to the piston chamber.

The pressure fluid thus distributed is conveyed to the valve mechanism by passages 40, in the head block 30, communicating with the rearward end of the chamber or bore 4! in the casing 22 wherein the riveting machine is slidably arranged. The piston chamber 3! may be provided with a suitable exhaust port (not shown) for conveying the exhaust fluid to the atmosphere.

In the periphery of the head block 30 is a sealing ring 42 to prevent the leakage of pressure fluid from the bore 4 l and in the forward portion of the bore is a spring 43 that seats with its front end against a shoulder 44 on the casing 22 and with its other end against a shoulder 45 on the cylinder 29. v

The riveting machine, when idle, is held in its rearinost limiting position in the casing by the spring 43 and is actuated to the different working positions relatively to the casing by pressure fluid. To this end the casing 22 is provided with a bore 46 of small diameter as compared with that of the bore 4| into which it opens at its front end, and in the bore 46 is a plunger 41 that seats against the rearward end of the head block 30 and has a pressure surface 48, on its rearward end, that is subjected to pressure fluid for moving the riveting machine forwardly in the casing 22.

The pressure fluid applied to the pressure surface 48 and to a pressure surface 49 on the rearwardend of the head block 30 is controlled by a throttle valve 50, of the poppet type, arranged in a valve chamber 5| in the rearward portion of the casing 22. The valve chamber contains a bushing 52 the bore 53 of which serves as a guiding surface for the stem 54 of the'valve 50. .At

. one end 'of the bore 53 is a tapered seat 55 for to. The cylinder has a piston chamber 3| for the accommodation of a hammer piston 32 reciprocable in the piston chamber 3| for actuating a the valve 50, and a spring 56 interposed between the valve 50 and a plug 51 threaded into the end of the valve chamber 5'l, to seal it, normally presses the valve against the seat The pressure fluid intended to be controlled by the valve 50 may be introduced into achamber 58 in the rearward end of the casing 22 by a suitable supply conduit (not shown) and is con.- veyed from the chamber lit to the valve chamber ill a passage in the casing. In the periphery oi the stem adjacent the valve 50 is an an nular groove to through which pressure fluid flows, in the openposition of the valve so, to a supply passage iii leading from the bore 53 to the rearward end 03? the core it. The groove (ill is of suitable length so that it will be at all times in communication with the passage 6t irrespective of the position of the valve, and with an atmosph ric ezfiiaust St, in the bushing and the casing, in closed position of the valve valve stem. also has a central passage extending loin nudinally therethrough and iicating with the annular groove S63 oly pressure fluid to the supfluid will also flow through e passage 6? in the wall and he stem are ports that afford niunication between the passage 82 d an annular groove at in. the periphery of stem adapted to register with a supply in casing 22 and leading to the Ei l that a considerable degree of movement the valve may place before said annur groove will register with the supply passage Owing to this arrangement the bore so may e fully charged to cause the plunger to move the power unit forwardly in the casing 22 for ressing the rivet set against the rivet erore the annular groove 535 will register with supply passage for delivering pressure fluid to the pressure surface is and to initiate operation of the riveting machine.

The exhaust of pressure fluid from the bore db is also controlled by the throttle valve and the stem E l accordingly has an annular groove l3?! located between the annular grooves Eli and tilt to aliord communication between the supply passage and an atmospheric exhaust port 68 in the bushing 52 and the adjacent portion of the casing 22. The ends of the passages 55% and lit that open into the bore 53 lie in different transverse planes so that when the annular groove 65 is in communication with the passage to the portion of the bore 53 lying between the annular groove 65 and the passage 68 will be blanked-off to prevent the loss of pressure fluid directly from supply to the atmosphere.

As is customary, the throttle valve 50 is unseated by manual force for valving pressure fluid to the riveting machine but means are provided to automatically cut-=01]? the admission of pressure fluid and thereby stop the operation of the riveting machine as soon as the rivet has been suitably upset. To these ends the tool is equipped with a rod 69 that is journaled in lugs '10, three in the present instance, arranged at spaced points along the length of the casing 22. The rod 69 is both rotatable and slidable in the lugs 10 and carries, a valve lifter 1| comprising a hub 12, keyed to the n a; n :3:

' rod, and a laterally extending wing 13 to engage the end 14 of the valve stem 54 projecting from the bore 53.

The valve lifter H is adjustable endwise of the rod 69 and such movement in a rearward direction is limited by a nut l8, threaded upon the rod 69 to enable the valve lifter to be shifted endwise of the rod. The opposite end of the valve lifter leats upon an end of a spring I encircling the,

assaisv rod 69 and seating against the adjacent lug 10. The spring l5 acts constantly to push the rod 69 rearwardly to maintain the wing 13 in the longitudinal plane of the end 14 of the valve stem.

The rod 89 may be conveniently rotated by a lever l6 clamped to the rod by a screw Ti, and the portion of the rod 69 forwardly of the foremost lug id is bent inwardly to form an arm 18 that extends through an opening T9 in the wall of the casing and part way into the bore ti. Preferably a flatted surface til is formed on the side of the arm confronting the adjacent lug it and on the head block 30 is an annular shoulder ill to engage the fiatted surface ill! for sliding the rod forwardly in. the lugs he opening lli is of suitable proportions so that the arm may swing'ireely and move within a required range in an. axial direction without interference and its rearward limiting position 9 is determined by the lever l :1 which may abut the forward surface of t-e intermediate lug lit for that purpose. A spa l terposed between the lever and the casing 2 normally holds the lever in an elevated position so that when the spring to acts to move the rod ES rearwardly the wing may move into position ior engagement with the valve stem to without interference by said valve stem.

In the operation oi the device and with the wing is of the valve lifter overlying the end of the valve stein the rod it is rotated, by means of the lever iii, to unseat the valve so. During the initial opening movement of the valve 5t pressure fluid will flow through the annular a groove and the supply passage iii into the bore so against the pressure surface id and move the riveting machine forwardly in the casing to place the rivet set so into contact with the rivet 28.

When the work has been correctly located with respect to the rivet set the valve-50 is further depressed until the annular groove 65 registers with the supply passage (it. Pressure fluid will then flow into the bore M against the pressure surface id to assist in pressing the riveting machine forwardly toward the work. At the same time pressure fluid flows through the ports 4%) and is distributed by the valve 39 to the piston chamber for actuating the hammer piston 32.

During the ensuing operation of upsetting the rivet the riveting machine moves gradually forwardly in the casing 22 and shortly prior to the completion of the work the shoulder 81 engages the arm "E8 and carries the rod 69 forwardly until the valve lifter is moved out of the plane of the r end it of the valve stem to release the valve.

The spring 56 will then move the valve 50 against the seat and cut-off the flow of the pressure fluid to the bores 46 and 4|.

The pressure fluid in the bore 4| will then be exhausted through the distributing and percussive elements of the machine, and in the new position of the valve 50 the groove 61 will place the passage 66 in communication with the exhaust passage 68 so that pressure fluid will also be exhausted from the bore 48. The groove will then also be in position to communicate the. pos sage 6i with the port 60 to provide an escape for pressure fluid from the bore 46. At the same time the spring 43 will move the riveting machine or power unit rearwardly to its initial position. The spring '15 will move the rod 69 simultaneously rearwardly until the arm 18 engages the surface 82 of the opening 19 so that the valve lifter will again be in position for engagement with the valve stem 54.

In practice, the present invention has been found to be a highly satisfactory means for assuring the correct formation of the upset portions 7 of the rivets and to prevent the operation of the riveting machine in excess of the time required for correctly upsetting the rivet.

I claim:

A fluid actuated tool, comprising a cas n a power unit slidable in the casing and having a a pressure surface, a poppet valve for controlling the flow of pressure fluid to the pressure surface for driving the power unit forwardly in the easing, a rod slidable and rotatable on the casing, a valve lifter on the rod to overlie the end of the in the casing for moving the valve lifter out of the plane of the end of the valve to release the valve, and a spring to return the valve to'its seat for cutting-off the flow of pressure fluid to' the pressure surface.

ROY O. ALLEN.

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