US2345663A - Primer - Google Patents

Description

April 4, 1944. G. E. FRANCK PRIMER Filed Dec. 24, .1941

` nu S@ .y n fk m l I||.| Il.- W ..m1%\ wm E? w mmfhq Z w Q N u MW w m um w www .u \X\\\ uw.; \i I@ i i... a. NS uw n Q ww. my NQ .mm ww wwwi *um W v a u N wm. Nm. \k N 3m S Patented Apr. 4, 1944 UNITED sTATEsrATENT OFFICE George E. Franck, Riverside, Ill., assignor to The Imperial Brass Manufacturing Company, Chicago, Ill., a corporation of Illinois Application December 24, 1941, Serial No. 424,261

5 Claims. (C1.-103--154) My invention relates to primers and in particular hand-operated plunger type primer pumps for gasoline engines.

Among the objects of my invention is to provide a new and improved primer of the plunger type which is equipped with a spring pressed shut-off valve and a locking mechanism which can be released by thumb pressure on the handle.

Also among the objects of my invention is to provide a new and improved plunger type primer in which spring pressure serves to hold the outlet valve closed when in normal position and likewise cooperates with the temporary locking mechanism in order to hold itin locked relation ship when it is desired to have the valve closed.

Another object of my invention is to provide a new and improved temporary locking mechanism for a primer wherein one main resilient member forces the locking element into engagement and wherein the locking element is spring pressed by another member so as to be always urged outwardly in a potential locking position regardless of the position of the plunger.

The invention also includes among its objects a releasing device for the locking mechanism incorporated in the handle and actuable from the face of the handle.

With these and `other objects in View, my invention consists in the construction, arrangetion showing the locking mechanism in released position.

A great variety of types `of automotive primers have been designed in the past devoted primarily to the purpose of forcing a priming uid into a gasoline engine for the purpose of starting it. Primers have been designed essentially as pumps fitted with a pump valve and check valves so that Vliduid might be drawn from a source of liquid supply and pumped through another liquid line to the engine. Little attention has been given to a convenient means for locking the primer pumps in closedposition or in providing a lock'- ing mechanism which could be quickly and easily released. It has been found that unless the handle of the plunger of the primer is retained in its inward position when not in use it is quite apt to be caught or knocked by the occupant of the automotive vehicle and either it is damaged or perhaps serves to cause damage to the occupant, his clothing or his person, `especially if the plunger handle sticks out a long ways. In providing pumps for tanks used in warefare handles which cannot be locked in place are extremely unserviceable.

In addition to this it is sometimes necessary to quickly operate the primer. In primers heretofore devised Where they may have been provided with a locking mechanism it has usually been of the screw type so that considerable time is necessary to unscrew the handle of the plunger from its locked position before the primer can be operated. It is the purpose of the present inventio-n to provide a quick, easy, economical device wihch locks automatically when the plunger is pressed inwardly and which can be released instantaneously.

In the embodiment of a primer chosen to illustrate my invention, there is shown a barrel ID comprising the main body portion of the primer and at one end thereof a casting I2 designed to accommodate check valves and an outlet valve.

Within the barrel is a plunger I4 provided at its outside end with a handle I6 used to operate the plunger.

The casting t2 is provided at the lower side as viewed in Figure 1 with a boss i8 in which is `a threaded aperture 20. At the inside end of the aperture il? is a passage 22 in the boss joining a corresponding passage 24l in the barrel and providing thereby an inlet port for the primer. A fitting 26 is threadably engaged within lthe aperture 20 of the boss I8. The tting has in it a passage 28 and a valve seat 3D upon which is positioned a ball valve 32 urged to closed position by a coiled spring 34. Inlet tubing 36 is secured to the fitting by means of a conventional nut 38.

Also on the casting I2 is provided a lateral boss 40 in which is a recess 42 closed by a threaded plug 44. Within therrecess 42 is a valve seat 46 upon which is positioned a ball valve 48 urged normally to a closedposition by a coiled spring 5t. A passage 52 connects the recess with the interior of the barrel I0 and forms an outlet port. `Communicating with the recess 42 is an outlet passage 54 to which is connected a tube similar to the inlet tube 36 and it is through this tube "to an inward position as shown in Figure l.

that the priming liquid is passed to the engine.

Within the barrel I is a chamber 56 which is elongated and cylindrical in form. The plunger I4 lies within the chamber 56. At the left end of the plunger I4 as viewed in Figure 1 is a recess 58 housing a coiled spring 60. A plug 62 has a sliding fit in the outside end of the recess 58 of the plunger. At the end of the plug is a cup valve 64 which has a snug frictional sliding fit in contact with the walls of the chamber 56. The plug likewise is provided with a depressed portion 66 at the end in which is positioned a disc valve 68. The disc valve in turn is seated normally upon an annular valve seat 1|) at the inside end of the outlet port 52. Y

It will be noted that the interior portion of the plug is provided with a slot l2 and that a pin 'Hl is mounted in the wall of the plunger and extends through the slot.

At the right end of the barrel as viewed in Figure l there is provided a sleeve 'i6 threaded at the outside in order to accommodate clamping nuts 'il' and 73. At the right-hand end of the plunger is an axial pocket B5 in which is positioned a coiled spring 32 cooperating with a piston 84 which is slidably mounted within the pocket axially and. normally urged in an outward direction. Likewise in the pocket .is a somewhat .heart-shaped cam 3S pivotally mounted by means of a pin 8S which extends through the wall of the plunger slightly of center. rlhe cam. has a cam face 89 which engages the piston and. a nnger 9!! which extends outwardly through an axially extending slot 92 in the wall of the plunger. A closure nut Sil surrounds the plunger and substantially closes the space between the plunger wall and the sleeve. Within the closure nut is an annular recess 95 which has a gentlyy sloping inward side and a shoulder portion on the outer side which is designed to engage the finger of the cam. Surrounding the plunger adjacent the right-hand end as viewed in Figure l is a frictional packing 98 held in place by rings 9S and a coiled spring l.

At the outer end the plunger is provided with Ythe knob I6 forming the handle which is threadably engaged upon the outer end of the plunger. The knob has a passage |532 extending centrally through it and within the passage is a button |03 'which extends a slight distance beyond the outer surface |54 of the knob. At its other end the button is positioned within the outer end of the axial pocket in the plunger and a relatively wide annular recess EN at the midportion of the button receives an inwardly spun shoulder |08 at the end of the plunger in order to hold the button slidably in place.

In operation the plunger is normally pressed In this position the disc valve 68 is seated upon the valve seat lo and held there by means of the coiled spring 60. It will be noted that there is some freedom. of movement due tothe slot 'l2 .being relatively long so'that it can slide a limited distance back and forth determined by the position of the pin ll. The valve 63 is spring pressed to a closed position. Likewise in normal position the cam 85 is urged outwardly by the spring pressed piston Vklei so that the nger 90 engages the outer wall of the annular recess 96.

When it is desired to release the plunger for priming the operator presses the button 593mwardly. Thereupon the inward end of the button is urged against the contacting point of the cam 86 which is on the lower side of the pin 88 as viewed in Figure 1 and tilts the cam in a clockwise direction as shown in Figures 1 and 4. When the button is pressed inwardly, the piston 84 compresses the spring 82 a slight amount. Tilting of the cam releases the linger 90 from engagement with the annular recess and the operator with his thumb still on the button |03 can draw the plunger outwardly by means of the knob. During the pumping operation of the primer, the operator grasps the knob with the fingers and retains his thumb upon the button.

. As the plunger is pumped in and out, priming liquid is drawn past the inlet check valve 30 and forced past the outlet check valve 48. When the pumping operation has been completed, the operator releases his thumb from the button |03, pushes the knob to its inwardmost position whereupon the spring pressed piston 84 again forces the cam BS, this time in a counterclockwise direction so that the finger 9S re-engages the Wall of the annular recess 93.

There has thus been provided a simple, eiiicient primer which can be easily and automatically lockedy in an inwardly pressed position and which can be unlocked with equal ease and rapidity in order that no time might be lost in working the primer should that be necessary.

Some changes may be made in the construction and arrangement of the parts of my device without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure, or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:

' 1. In a primer having a body, a substantially cylindrical chamber therein, inlet and outlet ports leading respectively into and out of said chamber and a valve sea-t at the outlet port, the combination of one part comprising a plunger reciprocably slidable in said chamber, a recess in the inside end of the plunger, another part comprising a plug slidably positioned in the recess and a valve carried by the plug adapted to be moved against the valve seat, one of said parts having a slot therein and the other of said parts having a pin mounted thereon and passing through the slot for limiting movement of the plug relative to the plunger, and a coiled spring in the bottom of the recess normally extending the plug relative to the plunger, said plunger at the other end thereof having an axial pocket and an axially extending slot in the plunger wall adjacent the pocket, a spring pressed piston slidably mounted in the pocket normally urged in an outward direction, a cam element in the pocket having a pivoted mounting eccentric relative to the plunger axis and having a cam face engaging said piston and a finger thereon forming aV detent normally extending outwardly through said slot, a nut surrounding the plunger substantially closing the outer end of the chamber and having an annular recess forming a shoulder on the outer side thereof normally engaging said finger to lock the plunger within the chamber in valve closing position and a sloping surface on the inside thereof adapted to engage the rear side of said linger and to urge said linger into the slot when the plunger is moved inwardly of the chamber, a knob secured to the outer end of the plunger having a central passage, and a button extending through the passage having one end inside said pocket engaging a portion of the cam element on the side of the pivoted mounting opposite from the finger, a relatively wide annular recess between the ends of the button and a relatively narrow anchoring element cn the plunger engaged therein providing a limited sliding lit for the button, said button having an outside end normally extending beyond the outer surface of the knob adapted to be depressed against spring pressure to release the finger from normal plunger looking position to allow manual pumping movement of the plunger, said cam element being adapted to automatically lock said plunger in valve closing position when the plunger is pushed inwardly sufficient to permit engagement of said finger and said shoulder.

2. In a primer having a body, a substantially cylindrical chamber therein, inlet and outlet ports leading respectively into and out oi said chamber and a valve seat at the outlet port, the combina tion oi a plunger reciprocably slidable in said chamber, a spring pressed valve slidably mounted at the inside end of the plunger having a closed position against the valve seat under spring presx sure, said plunger at the other end thereof having an axially extending slot in the plunger wall adjacent the pocket, a cam having a pivoted mounting eccentric relative to the plunger axis, a spring pressed element normally urging the cam to an outward position and a linger on the cam forming a detent normally extending out of said slot, a nut surrounding the plunger having a shoulder normally engaging said linger to lock the plunger within the chamber in valve closing position, a knob secured to the outer end oi the plunger having a central passage, and a button extending through the passage having one end inside said pocket engaging a portion of the cam element on the side of the pivoted mounting opposite from the linger, said button having a limited sliding engagement with the plunger and an outside end on said button normally extending beyond the outer surface of the knob adapted to be depressed against spring pressure to release the linger from normal plunger locking position to allow manual pumping movement of the plunger, said camelement being adapted to automatically lock said plunger in Valve closing position when the plunger is pushed inwardly sunicient to permit engagement of said finger and shoulder.

3. In a primer having a body, a substantially cylindrical chamber therein, inlet and outlet ports leading respectively into and out of said chamber and a valve seat at the outlet port, the combination of one part comprising a plunger reciprocably slidable in said chamber, a valve at the inside end of said plunger adapted to be moved against the valve seat, a recess in the inside end of the plunger and another part comprising a, plug slidably positioned in the recess carrying the valve, one of said parts having a slot therein and the other oi said parts having a pin passing through the slot for limiting movement of the plug and a coiled spring in the bottom of the recess normally extending the plug relative to the plunger, a ternporary spring pressed detent normally urged into engagement with the body and subject to action of said coiled spring, a knob secured to the outer end of the plunger, and a button slidably secured in the plunger engaging said detent and normally extending beyond the outer surface of the knob adapted to be depressed against spring pressure to release the detent from normal plunger locking position.

4. ln a primer having a body, a substantially cylindrical chamber therein, inlet and outlet ports leading respectively into and Kout of said chamber and a valve seat at the outlet port, the combination of one part comprising a plunger reciprocably slidable in said chamber, a valve at the inside end of said plunger adapted to be moved against the valve seat, a recess in the inside end of the plunger and another part comprising a plug slidably positioned in the recess carrying the valve, one of said parts having a slot therein and the other of said parts having a pin passing through the slot for limiting movement of the plug and a coiled spring in the bottom of the recess normally urging the plug outwardly relative to the recess, said plunger at the other end thereof having an axial pocket and an axially extending slot in the plunger wall adjacent the pocket, a spring pressed piston slidably mounted in the pocket normally urged in an outward direction, a cam element having a pivoted mounting eccentric relative to the plunger axis having a cam face engaging said piston and a ringer thereon normally extending out of said slot, a nut surrounding the plunger substantially closing the outer end of the chamber and having an annular recess forming a shoulder on the outside thereof normally engaging said linger to lock the plunger within the chamber in valve closing position and a sloping surface on the inside thereof adapted to engage the rear side of said finger and to urge said linger into the slot when the plunger is moved inwardly of the chamber, a knob secured to the outer end of the plunger having a central passage, and a button extending through the passage having one end inside said pocket engaging a portion of the cam element on the side of the pivoted mounting opposite from the finger, a relatively wide annular recess between the ends of the button having a relatively narrow anchoring element on the plunger engaged therein providing a limited sliding lit for the button, and an outside end on said button normally extending beyond the outer surface of the knob adapted to be depressed against spring pressure to release the nnger from normal plunger locking position to allow manual pumping movement of the plunger, said cam element being adapted to automatically lock said plunger in valve closing position when the plunger is pushed inwardly sufficient to permit engagement of said linger and shoulder.

5. In a primer having a body, a chamber therein, inlet and outlet ports leading respectively into and out of said chamber and a valve seat at the outlet port, the combination of a valve member reciprocably movable in the chamber, a valve face attached to said valve member adapted to move against the valve seat, a plunger and a connection between the valve member and the plunger providing limited reciprocal movement therebetween, a temporary spring pressed detent on the plunger normally urged into engagement with the body to lock the plunger in position, and a button movably secured in the plunger and engaging the detent, said button normally extending beyond the outer surface of said plunger and adapted to be depressed against said detent to release the detent from normal plunger locking position.

GEORGE E. FRANCK.

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