US2136504A

US2136504A - Safety device fob motors

Info

Publication number: US2136504A
Authority: US
Publication date: 1938-11-15
Anticipated expiration: 1955-11-15

Description

NOV '15, 1933- G. L. HILBERT ET AL 2,136,504

SAFETY DEVICE FOR MOTORS Filed May 25, 1957 Mmm Attorneys Patented Nov. 15, 1938 UNITED STATES PATENT OFFICE SAFETY DEVICE FOR MOTORS Application May 25, 1937, Serial No. 144,724

1 Claim.

This invention relates to a safety device for internal combustion motors, the general object oi the invention being to provide means for interrupting the ignition circuit of the motor if the oil pressure should cease or reach a dangerous point.

This invention also consists in certain other features of construction and in the combination and arrangement of several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which- Figure l is a rear elevation of the parts in section showing one form of the invention.

Figure 2 is a irontv view of Figure 1.

Figure 3 is a top plan view thereof.

Figure 4 is an elevation showing a modied form of the invention.

In this drawing, the. numerals I and 2 indicate a pair of disk-like parts fastened together by the screws 3 with a diaphragm 4 between them, the parts being recessed to form a chamber when fastened together with the diaphragm dividing the chamber into upper and lower portions. The disk I is formed with a reduced upper part 5 having a chamber I5 therein which is in communication with the rst-mentioned chamber and a stem I passes through the part 5 and has an enlargement 8 at its lower end which bears against the upper face of the diaphragm and is held in this position by a spring 9 which encircles the stem and bears against the top of the chamber 6. The member 2 is provided with a reduced lower part 2 which is bored to receive a pipe IU which is connected with the lubricating system of the motor so that when the pump is in operation some of the oil will pass through the pipe I into the lower part of the chamber and thus act on the diaphragm to raise the same and the stem 1 against the action of the spring 9.

A spring strip I I is fastened to the upper portion of the part as shown at I2 and carries a contact I3 at its free end for engaging a similar contact I4 carried by a bracket I 5 attached to the part 5. The bracket is insulated from the part 5 and its contact I4 is connected to a part of the ignition circuit of the motor while the strip II is grounded on the device. Thus when the motor is idle the ignition circuit is grounded but when the motor is in operation the oil pressure acting on the diaphragm will raise the stem 'I and cause the same to lift the strip II so that the contacts I3 (Cl. 20D-83) and III are out of engagement and thus the ignition circuit is not grounded and the engine can operate in the usual manner.

In order to prevent the device from interfering with the starting of the motor I provide a magnet I6 which is supported by but insulated from the upright frame II which is attached to the body of the device, the magnet being grounded to the frame as shown at I8 and being connected to the starter switch of the engine by the connections I9. The magnet is placed over the strip II so that when it is energized by the closing of the starter switch it will lift the strip II, thus separating the contacts I3 and I4 so that the ignition circuit will be completed. Then when the engine starts the oil pressure will lift the stern 'I so that the strip II will be held in raised position even after the magnet I5 becomes deenergized.

In the modification shown in Figure 4 the parts are arranged to break the ignition circuit when the oil pressure becomes low and in this form of the invention the strip I I extends below the bent part of a bracket I5 so that normally the contacts are separated. As the parts of the ignition circuit are connected with these contacts the circuit is broken when the member II is in its normal position. However, when the engine is in operation the oil pressure operating on the diaphragm will cause the stem of the diaphragm to raise the strip II so as to place the two contacts together and thus complete the circuit to the spark plug. However, if the pressure should drop to permit the diaphragm to move downwardly the strip II will also move downwardly and thus break the circuit.

We also provide a magnet I B connected with the starting circuit to attract the strip II and hold it in raised position when the starter switch is closed so as to permit the initial starting of the motor. As will be seen the modiiication is similar to the first form of the invention excepting the reversing 0i the contacts which act to break the circuit when the oil pressure is low instead of grounding the circuit as shown in Figure 1.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope -of the appended claim.

What is claimed is:

A switch for use in conjunction with the ignition circuit, starter switch, and pressure oiling directions into and from closing positions, respec? tively, and both pressure operative and electromagnetic means for moving said movable member in one direction, the pressure operative means for connection in said pressure system, and the electro-magnetic means for control by the starter switch.

GEORGE L. HILBERT. ARTHUR E. WEST. JAY H. WEST.