US3603300A

US3603300A - Safety shutdown device for stationary diesel engines

Info

Publication number: US3603300A
Application number: US886703A
Authority: US
Inventors: Oren D Moffett
Original assignee: FRANK W MANUFACTURER Inc
Current assignee: Murphy Management Inc
Priority date: 1969-12-19
Filing date: 1969-12-19
Publication date: 1971-09-07
Anticipated expiration: 1988-09-07

Abstract

A spring loaded bar normally held in a latched position against the spring bias, the bar being connected to one end of a flexible cable having its other end connected to a conventional internal combustion engine gear rack which is to be actuated upon engine malfunction, a normally open electrical circuit including electromagnetic means operable upon the energization of said circuit to release the latch to permit the bar to move rapidly in the direction of the spring bias, thereby rapidly pulling said cable and its connected rack to effect the engine shut down and to substantially simultaneously open the circuit to the electromagnetic means.

Description

United States Patent DIESEL ENGINES 8 Claims, 9 Drawing Figs.

[52] US. Cl 123/198 DB, 123/196 5 [51 1 Int. Cl ..F02b 77/08, FOlm 1/24 [50] Field of Search 123/198, 198 D, 196 S; 184/6 D [56] References Cited UNITED STATES PATENTS 2,112,664 3/1938 Dube ..i23/198 (D2) UX 2,201,123 5/1940 Davis 123/198 (D2) 2,645,474 7/1953 Barnes ..123/198 (D2) X 2,719,521 10/1955 Kinget al l23/198(D2) 2,854,964 10/1958 Wagner 123/198 (D2) FOREIGN PATENTS 668,568 3/1952 Great Britain.v 123/198 (D3) Primary Examiner-Al Lawrence Smith Attorney-Kimmel, Crowell & Weaver ABSTRACT: A spring loaded bar normally held in a latched position against the spring bias, the bar being connected to one end of a flexible cable having its other end connected to a conventional internal combustion engine gear rack which is to be actuated upon engine malfunction, a normally open electrical circuit including electromagnetic means operable upon the energization of said circuit to release the latch to permit the bar to move rapidly in the direction of the spring bias, thereby rapidly pulling said cable and its connected rack to effect the engine shut down and to substantially simultaneously open the circuit to the electromagnetic means.

PATENTED SEP 7 m1 SHEET 1 OF 2 mvmmn FIG. 7 mm 0. MOFFE rr ATTORNEY SAFETY SHUTDOWN DEVICE FOR STATIONARY DIESEL ENGINES BACKGROUND OF THE INVENTION Pl. Field ofthe Invention This invention relates to safety control means for pulling the oil and/or fuel racks of stationary diesel engines and to thereby effect the engine shutdown before extensive damage is done to the engine due to some malfunction. In such internal combustion engines. the usual conditions which require engine shutdown resides in a malfunctioning oil lubrication system or abnormal high operating temperatures. The present invention pertains to an automatically operated safety control means in the nature of an accessory for pulling the gear rack of a stationary diesel-type internal combustion engine under the above-named conditions of malfunctioning running operation. I

2. Description of the Prior Art The prior art is replete with various types of automatically operated safety control means for shutting down stationary internal combustion engines of the diesel-type, the automatic control means of those preceding the applicant in this field being actuated in response to a low-pressure condition in the lubricating oil system and/or engine operation at abnormally high temperatures. Such examples may be found in the US. Pat. No. 2,854,964 issued to Harold H. Wagner and No. 2,645,964 to Randolph C. Barnes.

One of the most common expedients for effecting the emergency or safety shutdown of a stationary diesel engine has been to provide spring means which normally tends to bias the fuel pump rack-bar for movement towards its off position. Since, however, the usual engine governor also controls the position of the fuel pump rack-bar, this usually prevents the safety control or shutdown spring means from operating. Barnes solves this problem by introducing a resilient connection between the governor and the rack bar. Wagner employs a hydraulic control means.

SUMMARY OF THE INVENTION This invention relates to a safety control attachment for a stationary or industrial-type diesel engine, and wherein the attachment is directly connected to the engine rack-bar to be automatically pulled or actuated upon the detection of a malfunction in the lubricating oil system or the operation of the engine under abnormally high temperature conditions. To this end this invention contemplates the provision of a housing suitable for connection on any support adjacent the engine as, for example, the supporting base or frame for the engine, and wherein there is provided a reciprocable drawbar which is manually latched under a spring loaded condition and cable connected with one end of the engine rack-bar. The latch is electromagnetically released upon the energization of a normally open electrical circuit, the actuation being responsive to gauge sensed abnonnal conditions of low oil pressure and high operating temperature. The release of the latching means causes the drawbar to move in the direction of its bias rapidly to pull the gear rack to shut down the engine and, the drawbar in the course of its movement operates switch means to deenergize the circuit. This results in fast shutdown time coupled with but little battery drainage.

Among the further objects of this invention is to provide a safety control device of the type generally described supra and wherein the attachment or accessory is inexpensive to manufacture and to maintain, noncomplex in construction and assembly, and which at all times is rugged and durable in use.

Other and further objects and advantages of the instant invention will become more manifest from a consideration of the following specification when read in light of the annexed drawings.

BRIEF DESCRIPTION OF THE DRAWINGS IN THE DRAWINGS FIG. I is a perspective view of the safety control attachment or accessory constructed in accordance with this invention,

FIG. I showing the accessory operatively connected via flexible cable means with one end ofa conventional rack gear of a diesel engine;

FIG. 2 is a top plan view of the accessory, the cover having been removed, and showing the component elements of the device in their respective inoperative positions;

FIG. 3 is a view similar to 1, FIG. 3 illustrating the component elements of the accessory in their respective operative positions;

FIG. 4 is a detail longitudinal cross-sectional view, FIG. 4 being taken on the line 3-3 of FIG. 2, looking in the direction of the arrows;

FIG. 5 is a detail transverse cross-sectional view, FIG. 5 being taken substantially on the vertical plane of line 5- 5 of FIG. 3, looking in the direction of the arrows;

FIG. 6 is a fragmentary detail cross-sectional view, FIG. 6 being taken substantially on the horizontal plane of line 6-6 of FIG. 5, looking in the direction of the arrows;

FIG. 7 is a fragmentary detail cross-sectional view, FIG. 7 being taken substantially on the vertical plane of line 7-7 of FIG. 3, looking in the direction of the arrows;

FIG. 8 is a schematic wiring diagram, this Figure illustrating the electrical components of the accessory; and

FIG. 9 is a fragmentary detail cross-sectional view taken substantially on the horizontal III'llC of line 9--9 of FIG. 4,

- looking in the direction of the arrows.

Referring now more specifically to the drawings, reference numeral 10 designates, in general, an accessory in the nature of an overriding safety control device for pulling the oil, fuel, and/or air supply racks of conventional stationary diesel engines to effect engine shutdown, the device being constructed in accordance with the teachings of this invention. The device 10 is seen to comprise a substantially hollow elongated rectangular housing 12 which may be formed of a single strip of material bent to provide an elongated substantially rectangular base 14 having integrally connected upright laterally spaced and parallel sidewalls I6, 18 and integrally connected upright

rectangular end walls

20, 22. The housing 12 further includes a continuous inwardly extending peripheral flange 24 overhanging the base 14, and in which is formed a plurality of tapped openings 26.

The housing 12 further comprises a pair of mounting flanges 28 of identical construction, the flanges being connected to the exterior (underside) side of the base 14 in such a manner so as to project longitudinally therefrom beyond the

adjacent end walls

20, 22. Each of the flanges 28 is substantially Z- shaped in transverse cross section, and each includes first and

second arms

30, 32 and an interconnecting bight 34. As is seen in FIG. 4, each of the arms 30 is fixedly connected by conventional means to the underside of the base 14 adjacent each

end wall

20, 22, respectively, and in such a manner that the arms 32 project therebeyond. Each arm 32 is also formed with a pair of transversely extending openings 35 to receive conventional fasteners therethrough in order to effect connection of the accessory or device 10 with the engine base (not shown) or other suitable support means disposed adjacent the diesel. The housing 12 further includes and is normally closed by an elongated substantially rectangular closure plate 36 which extends across the flange 24 and is secured thereon by releasable screw fasteners 38 which are threaded into the tapped openings 26.

Reference numeral 40 denotes an elongated substantially rectangular platform which is bolted to the base 14 by means of a plurality of conventional bolts 42 and cooperating nuts 44. Preferably, spacer washers 46 are carried on the bolts 42 receive for reciprocation therethrough the opposed ends of a drawbar 60. As is seen in FIGS. 2 to 4, inclusive, a substantially rectangular resilient and elastic abutment member 62 is disposed in the path of the movement of the drawbar 60 as it moves from its operative position shown in FIG. 3 to its inoperative position of FIG. 2. To serve a function to be described, a normally upright substantially hollow arcuate recess 64 (see FIGS. 4 and 6) is formed in a side 66 of the drawbar intermediate its ends. For purposes to be described,

. the drawbar 60 is also provided with a passage 68 which extends inwardly from the end 70 and with which a clamp screw 72 is in communication.

Reference numeral 74 designates a flange which is integrally connected with the bight portion 48-and which projects laterally therefrom in the direction of the sidewall 16. Projecting transversely through the flange 74 and fixedly secured thereon are a pair of first and

second pivot pins

76, 78, respectively, having portions thereof projecting above the upper side of the flange (see FIGS. 2, 3, 4 and At 80 is indicated a first flat elongated and substantially rectangular lever pivotally mounted adjacent one of its ends on the first pivot pin 76. The other end of the lever 80 extends in the direction of the end wall 82 and is slidably supported on the bight portion 48, across which it extends, during the course of its pivotal movement. Adjacent the outer terminus of the aforementioned other end of the lever 80 there is fixedly connected one end of an upright cylindrical latch pin 82 which extends across the side 66 of the drawbar 60.

Reference numeral 84 denotes, in general, a conventional wire spring having a helix 86 circumscribing the pin 76. One arm 88 abuts the arm 52 of the bracket 50 while its other arm 90 engages the latch pin 82. The construction is such that the latch pin 82 is constantly biased for pivotal movement in a counterclockwise direction, reference being had to FIGS. 2 and 3, to constantly force the latch pin against the drawbar side 66 as the drawbar reciprocates, and for entry into the recess 64 when the drawbar 60 is moved from its inoperative to its operative position as shown in FIGS. 2 and 3, respectively.

The first lever 80 and the spring 84 are held assembled on the pivot pin 76 by means of a conventional split holddown clip 92.

At 94 is indicated a flat substantially L-shaped second lever having a foot portion 96 and a leg section 98. The foot portion 96 is pivotally connected on the second pivot pin 78 and is secured thereon by a second holddown clip 100. The leg section 98 extends across and is slidably supported on the upper side of the first lever 80 during the pivotal movement of the second lever. The edge 102 of the leg section 98 is inclined inwardly in the direction of its junction with the foot portion 96, and the edge 102 is formed with a transverse inwardly extending arcuate notch 104 forming an arcuate shoulder 106, the notch 104 being of such size as to accommodate a portion of the latch pin 82 therein. The inner section of the edge 102 with the shoulder 106 forms a neb 108 disposed in the pivotal path of movement of the latch pin 82 and against which the spring arm 90 forces it into tangential engagement in the inoperative form of the invention.

At this point in the description of the invention it is deemed important to note that both of the

levers

80 and 94 extend across thebight portion 48 and below the drawbar 60. The drawbar 60 and the lever 94 are so associated that when the device is in its inoperative position of FIG. 2, the plane of the side 66 normally extends across a part of the notch 104 in confronting relation relative to the arcuate shoulder 106. When the drawbar 60 is moved to its operative position of FIG; 3, the recess 64 is disposed in vertically spaced confronting relationship relative to the shoulder 106, and since the latch pin 82 is constantly biased for movement against the side The curvilinear plane of the recess 64 extends less than 180 around the latch pin 82 when the device is in its operative position, and this plane continues into the plane of the arcuate shoulder for a total arcuate length of more than 270.

The means for locking the pin in its operative position and for effecting its release will be described in detail below.

Returning to the description of the components of the device 10, reference numeral 110 indicates an elongated substantially cylindrical rod having a threaded end portion 112 extending through a suitable opening (not shown) formed in the end wall 22. Nuts 114 threaded on the threaded end portion 112 clamp the rod 110 on the end wall 22 to position the rod 110 adjacent and parallel to the sidewall 16 above the platform 14. The rod 110 extends through an opening 116 extending from edge-to-edge of an elongated substantially rectangular and solid slide block 118 adjacent an end thereof, the slide block 118 being freely reciprocable on the rod 110. The other end of the slide block 118 projects laterally away from the rod 110 and transversely across the drawbar 60. This end 119 of the block 118 at the underside 120 thereof is formed with a downwardly opening Lshaped rabbet 12 extending from edge-to-edge thereof and in which the drawbar 60 is received. Screw means 124 connect the slide block 118 on the drawbar 60 centrally of the ends of the latter whereby reciprocation of the slide block causes identical movement of the drawbar.

An elongated helicoidal spring 126 circumscribes the rod 110 over a portion thereof, the spring having an end engaging an edge of the slide block, and its other end abutting a tension adjusting nut 128 threaded on the rod portion 112 and which is followed by a locknut 130. Thus, the slide block 118 and its connected drawbar 60 are constantly biased for movement from their respective operative positions of FIG. 3 to their inoperative positions of FIG. 2.

Reference numeral 132 denotes an eye anchor fixedly connected to the end wall 20 and in which is connected one end 134 of a helicoidal spring 136. The other end 138 of the spring is connected to one end of an enlarged elongated solid head 140, and fixedly connected to the other end of the head 140 is one end of an elongated flexible wire 142 having its other end threaded through an opening 144 which extends through the slide block 118 from edge-to-edge thereof. The aforementioned other end of the wire 142 continues in the direction of the end wall 22 and is slidably received within a fitting 146 to extend laterally therefrom and outwardly of the housing 12. The fitting 146 is secured on the end wall 22 as by means of a locknut 148. The above-mentioned other end of the wire 142 is fixedly connected to the stem 150 of a T-shaped handle 152 having a cross head 154. As is seen in FIGS. 2 to 4, inclusive, the spring 136 maintains the wire 142 constantly under tension and to bias constantly the enlarged head 140 to the left. It will be noted that normally, and under inoperative conditions of the device 10, the slide block 118 is normally spaced from the adjacent end of the head 140, and when the slide block 1 18 is in its operative position of FIG. 3, the distance between the slide block and the head is materially increased.

Reference numeral 156 denotes an electromagnet including its inverted substantially U-shaped mounting bracket 158. The bracket 158 includes a bight 160 from the opposed ends of which laterally depend the

arms

162, 164 which engage across the opposed ends of the winding 166 and which are fixedly secured to the platform 40. The electromagnet 156 also includes a reciprocable armature 168, and the latter, at its outer end, carries a diametrically extending stop pin 170 which projects beyond the opposed sides of the armature 168. The stop pin 170 has a depending end 172 which is loosely received within an opening 174 (see FIG. 6) which is formed in the leg section 98 of the lever 94 adjacent its outer terminal end. A helicoidal spring 176 under compression circumscribes the armature 168 and has one end thereof abutting against the stop pin 170, while its other end abuts against the adjacent arm 162 of the bracket 158. It will thus be understood that the armature 168 is constantly biased for movement in a direction away from its winding 166.

While the connection between the depending portion 172 of the stop pin 170 and the opening 174 formed in the lever 94 is loose, it will be understood that the connection is such that as the armature 168 is reciprocated, the lever 94 will pivot about its pivot pin 78.

In FIG. 8 there is illustrated two control circuits for the electromagnet 156. Each of the control circuits is of the seriestype, and for the purpose of clarity the first of such circuits will be designated as the automatic control circuit, while the second one thereof will be referred to as the manual override circuit.

Referring first to the mechanical features of the circuitry, reference numeral 180 denotes a single-pole, single-throw electrical switch having a base 182 fixedly secured by conventional fastening means 184 to the platform 40. A fixed switch contact 186 is fixedly connected on the side 188 of the base 182 in confronting relationship relative to a fixed switch contact 190 supported on an arm 192 of a bracket 194 fixedly connected on the side 188. The switch arm 196 includes a pair of

contacts

198, 200 disposed at one end and at opposite sides thereof, the arrangement being such that with the contact 198 engaging the contact 190 in the position shown in FIG. 2, the switch 180 is open, and with the

switch contacts

186 and 200 in engagement, the switch is closed. The switch arm 196 is pivotally supported on the arm 202 of an angle bracket 204 also fixedly connected on the side 188. The switch arm 196 is eccentrically connected by means of the helicoidal spring 206 to one end 208 of a switch actuating lever 212. The other end of the lever 212 is electrically insulated as at 214. The tension of the spring 206 on the actuating lever 212 is such as to cause the insulated end 214 to constantly tend to pivot in a clockwise direction (reference being had to FIGS. 2 and 3) in such a manner as to dispose the insulated end 214 in the path of movement of the drawbar 60- to the left. It should here be noted that the switch 180 is of conventional construction, and of the components thereof described above, the fixed switch contact 190 is never electrically connected in any circuit, this contact merely serving as stop means to limit the pivotal movement of the switch arm 196 in a counterclockwise direction, that is, in a direction away from the fixed switch contact 186.

A second switch 216 is mounted on the sidewall 18. The switch 216 is of the normally open pushbutton-type and is ac tuated to move to its closed position by pressing inwardly on the button 218. Also mounted on the sidewall 18 is a pair of

binding posts

219, 220. Each binding post is threaded for connection with conventional securing

nuts

222, 224, respectively, to provide connecting means for external leads. These binding posts are electrically insulated from the housing 12.

Referring now specifically to FIG. 8 of the drawings, B designates a conventional source of energy such as, for example, a battery (not shown). One side of the battery is grounded at G in the usual manner as by wire 226 while the other side thereof connects by wire with the binding post 219.

Reference numeral 230 designates a temperature gauge for sensing a high water, oil or air temperature condition in the conventional stationary diesel engine. At 232 is indicated a conventional oil pressure gauge. Such gauges are manufactured by the Frank W. Murphy Manufacturer, 1nc., 3131 South Sheridan, Tulsa, Okla. 74145, and are sold under the registered trademark SWITCHGAGE. The temperature gauge is identified as the manufacturers model No. 20-T-2l and the oil pressure gauge is publicly offered as model No. 20-

P- 27 as identified in the manufacturers bulletin No. RB-6901, dated Jan. 1, 1969. Each of these switch gauges includes, as component elements thereof, single-pole, single-

throw switches

234, 236, respectively, which are adapted to close upon the malfunction of the system each gauge is monitoring. The

gauges

230, 232 are schematically shown in FIG. 8, but it will be understood that each gauge is provided with an

indicator arm

238, 240 which sweeps a scale (not shown) on their respective gauges whereby the condition of any system being monitored may be visually ascertained. Each of the gauges also includes an adjustable fixed switch contact 242, 244 against which the

indicator arms

238, 240 are adapted to close in the presence of a malfunction in any of the monitored systems. Each of the

indicator arms

238, 240 are grounded by

wires

246, 248 to their respective grounds G and G which are common to the ground G. Wires 250, 252 connect the fixed switch contacts 242, 244, respectively, with one end of the wire 254, and the other end of the wire 254 connects with the binding post 220.

The internal wiring of the device 10 comprises connecting one side of the coil or winding 166 by wire 254 to the binding post 219 and connecting the other side of the coil 166 by wire 356 to one side of the switch 180, the latter being closed when the device 10 is in its operative condition. The other side of the switch connects via wire 258 to the fixed switch contact 260 of the pushbutton switch 216, and wire 262 connects the fixed switch contact 260 with the binding post 220.

Thus it is seen that when either of the indicating

arms

234 or 236 close against their fixed switch contacts 242 or 244, respectively, indicating an engine malfunction, the series circuit is completed to the coil or winding 166 reading, for the gauge 230, G, wire 226, battery B, wire 228, binding post 219, wire 254 to one side of the coil 166, wire 256 and across the switch 180, wire 258, wire 262, binding post 220, wire 254, wire 250, fixed switch contact 242, indicating arm 238, and wire 246 to the ground G common with the ground G.

Should the gauge 232 indicate a malfunction, the wire 250 is read out of the above-described circuit and the wire 252 is substituted therefor which connects through the fixed switch contact 244, the arm 240, and the wire 248 to the common ground G Thus, upon the closing of either of

switches

234 or 236, the coil 166 becomes energized to serve a function to be described.

The manually operated series circuit includes the ground G, wire 226, battery B, wire 228, binding post 219, wire 254 to one side of the coil 166. The wire 258 connects the other side of the coil 166 with the fixed switch contact of the normally open pushbutton switch 216 which, when closed, continues the circuitry from the other side of the switch 216 through wire 264 which is grounded on the casing 12 and which is also the common ground. Again, the coil or winding 166 becomes energized.

The device 10 is here shown in association with a conventional stationary diesel-type of internal combustion engine 300 (see FIG. 1) monitored by any one or both of the

gauges

230, 232. The engine 300 includes a plurality of fuel pumps 302, there being one pump for each of the engine cylinders. The pumps are of the type wherein rotation of the plunger effects metering of the fuel to the engine cylinders, and each pump is shown as having a plunger 304 with a gear 306 fixedly secured thereon and meshing with a rack gear 308 whereby sliding movement of the rack gear 308, the several pump plungers 304, will be simultaneously angularly adjusted, all in accordance with the conventional practice. The rack gear 308 is normally positioned during engine operation by a governor (not shown) driven by the usual and conventional means.

One end of a flexible actuating cable 400 is extended into the passage 68 formed in the drawbar 60 and is clamped thereon as by the clamp screw 72. The other end of the cable 400 extends through a suitable opening (not shown) formed in the end wall 22 and is fixedly connected to one end of the rack gear 308, the cable being formed of high strength steel and slidably encapsulated in a flexible polyvinyl and steel housing 402.

This completes the description of the device 10 and its connection with the internal combustion engine 300. The operation of the device 10 is briefly set forth below.

Referring now specifically to FIG. 2 of the drawings, the component elements of the device 10 are shown in their inoperative positions before the engine 300 has been started or after one of the

gauges

230, 232 has sensed a malfunction causing one or the other of the indicating

arms

234, 236 to move to their closed positions across their respective fixed switch contacts 242, 244. Before the engine 300 is again started, the

closed switches

234, 236 must be locked out to keep the automatic control circuit open until the

pointers

238, 240 separate from their respective fixed switch contacts 242, 244. Any conventional means may be employed for this purpose, and since the same do not constitute any part of the present invention, such means is indicated as a normally closed single-pole, single-throw manually operated switch 500 (see FIG. 8). The switch 500 is interposed in the wire 254 between the binding post 220 and the connection of the wire 254 with the wires 250 and 252.

Assuming that the switch 500 has been moved to its open condition, the device or accessory 10 must be set. To effect the setting, and remembering that the device 10 is in its inoperative position of FIG. 2, the operator will grasp the handle 152 and draw the same to the right. The wire 142 and the head 140 are drawn in the same direction against the tension of the spring 136 until the head 140 engages against the adjacent edge of the slide block 118 whereupon the continued exertion of force on the handle 152 will cause the slide block to move to the right against the tension of the spring 126 and simultaneously move the drawbar 60 in the same direction. This movement continues in order to draw the recess 64 into substantially confronting relationship relative to the latch pin 82. As this condition is achieved, the spring arm 90 forces the latch pin 82 off the neb 108 and into the recess 64 and notch 104. As this movement takes place, the bias of the spring 176 turns the lever 94 in a clockwise direction, reference being had to FIGS. 2 and 3, to cause the shoulder 106 to lock behind the latch pin 82. It should also be noted that as the drawbar 60 moves to the right in the manner described above, the insulated end 214 of the switch actuator 212 escapes from the adjacent end of the drawbar 60 to assume the position shown in FIG. 3, and, in moving from its position shown in FIG. 2 to its position of FIG. 3, the switch actuator 212 causes the switch arm 196 to pivot in a counterclockwise direction to close the contact 200 against the adjacent fixed switch contact 186, thereby establishing the operative condition of FIG. 8, it being remembered that the switch 500 is open.

With the engine 300 started and achieving its normal operating condition, the indicating

arms

238, 240 will move away from their respective fixed switch contacts 242, 244 to the position shown in FIG. 8, and thereafter the switch 500 is closed.

Now should a malfunction in the lubricating or cooling system obtain in the motor 300, one or the other of the indicating

arms

238, 240 will close across their respective fixed switch contacts 242, 244 to thereby establish the automatic series circuit described above. With the closing of one of the

switches

234, 236, the coil 256 is energized and, referring to FIG. 3, the armature 168 is pulled into the coil 166 of the electromagnet 156 against the tension of the spring 176. This will draw the stop pin 170 and its depending portion 172 in the same direction. Since the depending portion 172 is received within the opening 174 of the lever 94, the lever 94 will be pivoted in a counterclockwise direction releasing the shoulder 106 from behind the latch pin 82. Remembering now that the recess 64 extends less than 180 around the latch pin 82, with the release of the shoulder 106 from behind the latch pin, the tension exerted by the spring 126 on the slide block 118 and, consequently, on the screw 24 and drawbar 60, the latch pin is expressed from the recess 64 and pivots in a clockwise direction against the bias of the spring arm 90 whereby the drawbar is free to move from its position shown in FIG. 3 to the left to assume its inoperative position shown in FIG. 2.

The drawbar 60, in moving from its operative position of FIG. 3 to its inoperative position of FIG. 2, engages the insulated end 214 causing the switch actuator 212 to pivot and I snap the switch arm 196 from its operative position to its inoperative position of FIG. 3. This deenergizes or opens the circuit to thecoil 166.

Nowiasthe drawbar 60 moves from its operative position of FIG. 3 to its inoperative position of FIG. 2, the connected cable 400 moves therewith to transmit annular movement of the plungers 304 to effect the engine shutdown.

After the malfunctioning system has been rectified, the starting procedure described above is repeated.

If it be assumed that the engine is running satisfactorily and with the device 10 in its cocked or operative position shown in FIG. 3, the operator may manually effect the engine shutdown by pressing the button 218 to close the switch 216. This will again energize the winding 166 through the manual control circuit described above causing the components of the device 10 to move from their positions of FIG. 3 to their positions of FIG. 2 to effect engine shutdown.

Having described and illustrated one embodiment of this invention in detail, it will be understood that the same is offered merely by way of example, and that this invention is to be limited only by the scope of the appended claims.

What is claimed is:

1. An accessory (10) for connection to the rack gear (308) of an internal combustion engine(300), said rack gear being movable in one direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising:

first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown;

second means (110, 118, 124, 126, 128) connected with said first means for constantly biasing said first means for movement in said one direction.;

third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement;

fourth means (166, 168, 170, 172) for actuating said third means to effect release of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shut down;

fifth means (220) for operatively connecting sixth means (234, 236, 254), monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; a source of electrical energy; said fourth means includes a normally closed deenergized first electrical circuit (254, 166, 256, 180, 258, 260, 262);

seventh means (219) disposed in said first electrical circuit for connecting said first electrical circuit with said source of electrical energy; and wherein said sixth means includes a second normally open electrical circuit connected in series with said first electrical circuit, said sixth means closing upon detection of an engine malfunction and to thereby energize said first electrical circuit.

2. An accessory as defined in claim 1 wherein;

movement of said first means in said one direction actuates an element of said fourth means for deenergizing said circuits.

3. An accessory as defined in claim 2 wherein:

said element comprises a normally closed first switch con nected in said first circuit and actuated to its open position by movement of said first means in said one direction.

4. An accessory as defined in claim 3 and:

eighth means operatively connected with said fourth means and comprising a third electric circuit (G, 226, B, 228, 219, 254, 166, 256, 180, 258, 260, 216,264, G having a normally open manually operable switch connected therein movable to its closed position to energize said first and third circuits to effect the actuation of said fourth means.

5. An accessory as defined in claim 1 and;

a base (14);

and wherein said first means comprises a drawbar (60),

means (50) fixedly connected on said base and supporting said drawbar for reciprocation thereon, and a flexible cable (400) for connecting one end of said drawbar with one end of said rack gear.

6 An accessory as defined in claim 1 and;

said third means includes a latch pin (82) mounted on a lever (80) which is pivotally supported on said base and releasably connected with means (64) on said drawbar to hold said drawbar against movement in said one direction under the influence of said spring, and means (94) pivotally supported on said base and including means (106) releasably engaging said latch pin and cooperating with said drawbar means for releasably engaging said latching said pin thereon, and means (174) on said pivotally supported means for connection with said fourth means.

7. An accessory (10) for connection to the rack gear (308) of an internal combustion engine (300), said rack gear being movable in one direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising;

second means (110, 118, 124, 126, 128) connected with said first means for constantly biasing said first means for movement in said one direction;

fourth means (166, 168, 170, 172) for actuating said third means to effect release of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shutdown;

fifth means (220) for operatively connecting sixth means (234, 236, 254), monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction;

a base (14);

and wherein said first means comprises a drawbar (60) means (50) fixedly connected on said base and supporting said drawbar for reciprocation thereon, and a flexible cable (400) for connecting one end of said drawbar with one end of said rack gear; and wherein said second means comprises an elongated rod (110) fixedly supported on said base, a slide block (118) mounted for reciprocation on said rod, means (124) connecting said drawbar on said slide block for reciprocation therewith, and a spring (126) mounted on said rod and engaging said slide block to constantly bias said slide block and its connected drawbar for movement in said one direction. 2 8. An accessory (10) for connection to the rack gear (308) of an internal combustion engine (300), said rack gear being movable in one direction to effect engine shutdown in the 5 event of an engine malfunction, said accessory comprising:

second means (110, 118, 124, 126, 128) connected with said first means constantly biasing said first means for movement in said one direction;

Third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement,

fifth means (220) for operatively connecting sixth means (234, 236, 254) monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction;

said third means includes a latch pin (82) mounted on a lever which is pivotally supported on said base and releasably connected with means (64) on said drawbar to hold said drawbar against movement in said one direction under the influence of said spring, and means (94) pivotally sup orted on said base and including means (106) releasa ly engaging said latch pm and cooperating with said drawbar means for releasably latching said pin thereon, means (174) on said pivotally supported means for connection with said fourth means; and wherein said pivotal support means comprises a lever (94) having a notch (106) formed therein cooperating with said drawbar means (64) to hold said latch pin against movement and thus holding said drawbar against movement in said one direction; and

said fourth means includes an electromagnet having a coil and an armature mounted for reciprocation therein, a stop pin extending transversely across said armature projecting from opposite sides thereof; resilient means on said armature engaging said stop pin and biasing said ar mature for movement away from said coil, connecting said lever to effect pivotal movement thereof upon energization of said coil and to thereby effect release of said latch pin.

Claims

1. An accessory (10) for connection to the rack gear (308) of an internal combustion engine(300), said rack gear being movable in one Direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising: first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown; second means (110, 118, 124, 126, 128) connected with said first means for constantly biasing said first means for movement in said one direction.; third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement; fourth means (166, 168, 170, 172) for actuating said third means to effect release of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shut down; fifth means (220) for operatively connecting sixth means (234, 236, 254), monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; a source of electrical energy; said fourth means includes a normally closed deenergized first electrical circuit (254, 166, 256, 180, 258, 260, 262); seventh means (219) disposed in said first electrical circuit for connecting said first electrical circuit with said source of electrical energy; and wherein said sixth means includes a second normally open electrical circuit connected in series with said first electrical circuit, said sixth means closing upon detection of an engine malfunction and to thereby energize said first electrical circuit.

2. An accessory as defined in claim 1 wherein; movement of said first means in said one direction actuates an element (180) of said fourth means for deenergizing said circuits.

3. An accessory as defined in claim 2 wherein: said element comprises a normally closed first switch connected in said first circuit and actuated to its open position by movement of said first means in said one direction.

4. An accessory as defined in claim 3 and: eighth means operatively connected with said fourth means and comprising a third electric circuit (G, 226, B, 228, 219, 254, 166, 256, 180, 258, 260, 216, 264, G3) having a normally open manually operable switch connected therein movable to its closed position to energize said first and third circuits to effect the actuation of said fourth means.

5. An accessory as defined in claim 1 and; a base (14); and wherein said first means comprises a drawbar (60), means (50) fixedly connected on said base and supporting said drawbar for reciprocation thereon, and a flexible cable (400) for connecting one end of said drawbar with one end of said rack gear. 6 An accessory as defined in claim 1 and; said third means includes a latch pin (82) mounted on a lever (80) which is pivotally supported on said base and releasably connected with means (64) on said drawbar to hold said drawbar against movement in said one direction under the influence of said spring, and means (94) pivotally supported on said base and including means (106) releasably engaging said latch pin and cooperating with said drawbar means for releasably engaging said latching said pin thereon, and means (174) on said pivotally supported means for connection with said fourth means.

7. An accessory (10) for connection to the rack gear (308) of an internal combustion engine (300), said rack gear being movable in one direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising; first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown; second means (110, 118, 124, 126, 128) connected with said first means for constantly biasing said first means for movement in said one direction; third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement; fourth means (166, 168, 170, 172) for actuating said third means to effect releaSe of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shutdown; fifth means (220) for operatively connecting sixth means (234, 236, 254), monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; a base (14); and wherein said first means comprises a drawbar (60) means (50) fixedly connected on said base and supporting said drawbar for reciprocation thereon, and a flexible cable (400) for connecting one end of said drawbar with one end of said rack gear; and wherein said second means comprises an elongated rod (110) fixedly supported on said base, a slide block (118) mounted for reciprocation on said rod, means (124) connecting said drawbar on said slide block for reciprocation therewith, and a spring (126) mounted on said rod and engaging said slide block to constantly bias said slide block and its connected drawbar for movement in said one direction.

8. An accessory (10) for connection to the rack gear (308) of an internal combustion engine (300), said rack gear being movable in one direction to effect engine shutdown in the event of an engine malfunction, said accessory comprising: first means (60, 400) connected with said rack gear (308) for moving said rack gear in said one direction to effect said engine shutdown; second means (110, 118, 124, 126, 128) connected with said first means constantly biasing said first means for movement in said one direction; Third means (82, 64, 94) connected with said first means for releasably latching said first means against said movement. fourth means (166, 168, 170, 172) for actuating said third means to effect release of said first means enabling it and said rack gear to move under said bias in said one direction and to effect said engine shutdown; fifth means (220) for operatively connecting sixth means (234, 236, 254) monitoring said engine for malfunction, with said fourth means for automatically actuating said fourth means upon detection of an engine malfunction; said third means includes a latch pin (82) mounted on a lever (80) which is pivotally supported on said base and releasably connected with means (64) on said drawbar to hold said drawbar against movement in said one direction under the influence of said spring, and means (94) pivotally supported on said base and including means (106) releasably engaging said latch pin and cooperating with said drawbar means for releasably latching said pin thereon, means (174) on said pivotally supported means for connection with said fourth means; and wherein said pivotal support means comprises a lever (94) having a notch (106) formed therein cooperating with said drawbar means (64) to hold said latch pin against movement and thus holding said drawbar against movement in said one direction; and said fourth means includes an electromagnet having a coil and an armature mounted for reciprocation therein, a stop pin extending transversely across said armature projecting from opposite sides thereof; resilient means on said armature engaging said stop pin and biasing said armature for movement away from said coil, connecting said lever to effect pivotal movement thereof upon energization of said coil and to thereby effect release of said latch pin.