US2724584A - Carburetor - Google Patents

Description

Nov. 22, 1955 w. E. ARMSTRONG 2,724,584

CARBURETOR Filed Dec. 14, 1950 s Sheets-Sheet i INVENTO'R. WERNER E. ARMSTRONG ATT/PNEX Nov. 22, 1955 w. E. ARMSTRONG 2,724,584

CARBURETOR Filed Dec. 14, 1950 I5 Sheets-Sheet 3 INVENTOR. WERNER E. ARMSTRONG Wi -W shown in Figure 1. a

2,724,584 CARBURETOR Werner E. Armstrong, Milwaukee, Wis., assignor, by

mesne asslgnments, to Fairbanks, Morse & Co., Chicago, 111., a corporation of Illinois Application December 14, 1950, Serial No. 200,827

2 Claims. Cl. 261-69) vertical plane exclusively in the use of the tool.

Still another object of my invention is to provide a carburetor that maybe installed into a conventional fuel supply line leading to a conventional manifold of an internal combustion engine. l

A further object of my invention is to provide a device of the character described that may be provided with various types of mountings to fit particular installations designedfor its adoption on various engines.

It is manifest to anyone familiar with the art that power tools such as hand saws or the like which are operated by an internal combustion engine are quite frequently employed in a manner that necessitates their being inverted or inclined angularly to one or the other side, and it is imperative that the supply of fuel be constant inany position.

With the device as describedand claimed herein, the fuel supply will at all times be governed and regulated, yet provide quick response to the throttle adjustment.

The device is exceedingly simple in construction, economical to manufacture, yet highly etficient for the purpose for whichit is intended.

Other and further objects of my invention will become more apparent as the description proceeds when taken in conjunction with the drawings in which:

3 Figure 1 is a side elevation of the assembled carburetor. 1 1

Figure 2 is a top view of the assembled carburetor as Figure 3 is a fragmentally, laterally disposed crossitcdStates Patent sectional view of the assembled carburetor, taken at the line 33 in Figure 2.

Figure 4 is a longitudinal fragmentary cross-sectional view of the device taken at the line 4-4 in Figure 2, and Figure 5 is a view as shown in Figure 3 enlarged to provide for clearer detail of the component parts constituting the device.

Similar characters of reference indicate corresponding parts throughout the several views, and referring now to the same, the character 10 shows a longitudinal cylindrical body of the device forming an air passage which is provided ateach of its ends with flanges shown as 11 I e and 12. The flange 11 acts as a support for an air cleaner (not shown), while the flange 12 acts as a mounting to support the entire device onto the air intake manifold which is shown in fragmentary section and indicated by the character 13. In Figures 3 and 4, I show a lateral and longitudinal cross-section respectively. The fuel inlet 14 engages the lower portion of a housing or enclosure 15 having a cap 15', and the inlet 14 is supported by 2,724,584 Patented Nov. 22, 1955 means of a threaded portion at 16 as shown in Figure 3 and is provided with a port 17 having a seat 18 and terminating into a larger tubular portion 19, which guides the ball 20, which ball contacts the seat 18 and has a pin 21 disposed on its top surface.

The cap 15' is shown attached to the housing or enclosure 15 bymeans of a plurality of screws 22. However, this may be attached in any efficient manner, and a pliable diaphragm 23 is disposed between the body 15 of the enclosure and the cap 15'. There are a pair of circular rigid discs of sheet material shown as 24 and 24' adjacent the opposite sides of the diaphragm 23. The diaphragm 23 is provided with an aperture through its center, and the discs 24 and 24' are attached to a longitudinal centrally disposed pin 25, extending through a centrally disposed aperture within the diaphragm.

The discs 24 and 24' are shown arcuated outwardly at their outer peripheral, edges 26, to prevent the edges of the discs from cutting into the pliable diaphragm during its actuation.

A lever 27 is pivotally inserted at 28 into the inner face 29 of the enclosure 15. This lever is forked at its upper end 30, and engages a collar 31 forming a part of the pin 25, and a conical resilient member or spring 32 is disposed between this collar 31 and the inner face 29 of the enclosure 15. The lower right angle portion of the lever 27, rests on the top of the pin 21 which contacts the upper face of the valve ball 20 and keeps the ball 20 in engagement with the seat 18 in the port 17 which acts as a valve for the fuel inlet.

There is a counter-balance weight 33 attached to the top of a pivoted arm 34, which arm is hingedly mounted at 35 to a bracket 36 attached to the inner face 37, of the cap 15', by means of screws 38 or in any other eflicient manner. This arm 34 has a pin 39 attached thereto and extending at right angle therefrom atits lower end, and the outwardly extending end of the pin 39 engages thecenter of the diaphragm disc 24'.

Extending outward through the wall of the diaphragm enclosure 15 and in alignment with the pin 25 is an outlet port 40 which enters a fuel passage 41 which extends longitudinally within the member 42 which is attached to the body 10 of the carburetor tube, and a valve stem 43 having a conical point 44 engaging the outer periphcry of the port 40, threadedly engages the member 42 and is shown with a slotted head 45 for adjusting the point 44 on the stem 43. The stem 43 is held secure and kept from revolving by means of the resilient member 46 disposed between the head 45 and the member 42, thus forming a main fuel adjusting valve.

The longitudinal tubular fuel passage 41 has a tubular There is shown a choke valve 54, mounted on a shaft 55, which is journaled within the enclosure 48 and actuated by means of the lever 56, and a throttle valve 57,

disposed within the enclosure 48, is mounted on the shaft 58 which is actuated by the lever 59 and the adjustment of the lever is limited by its engagement with the stop screw 60.

The operation of the device is extremely simple and positive. Obviously, the purpose of the carburetor is to provide a constant and correct fuel supply no matter what angle the tool actuated by the internal combustion engine is held. The carburetor forming a part of the engine will function equally eflicient whether the engine is turned over onto either side, or inverted. The stabilizing counterbalance will at all times perform its function. It is manifest to anyone, familiar with the art that the engine during its operation will create'a vacuum in the compartment 15 causing the diaphragm 23 to flex inwardly against the pressure of the resilient member 32 and by so doing will permit air to enter the'compartment formed by the cap 15' through the vent 61, and as the resilient member 32 is compressed, the lever 27 will move toward the outlet port 40 at its upper end causing the pin 21 to rise, thereby permitting the ball 20 to be free on the seat 18 permitting fuel to enter through the inlet 17. However, when the device is turned to a position as shown in Figure 2, and the cap 15 is at the bottom, the weight 33 will cause the lever 34 to pivot at. 35 forcingtthe pin 39 upwardly to stabilize the Weight of the diaphragm, spring, fuel and all parts resting on upper. part of the diaphragm, and will balance the action of the diaphragm against the pressure of the spring 32 permitting the vacuum caused by the engine to draw the fuel in a normal manner. This would not be possible without the stabilized counterbalanced feature provided by the Weight 33. The control of the fuel supply through the port 40 is accomplished by the manual adjustment of the screw 43, and as the fuel supply enters the port 40, it will flow through the main fuel supply passage in the member 42 and will pass through the port 47 where it will mix with the air and where it is controlled by means of the throttle vane 57 on the shaft 58 actuated by the throttle lever 59.

' The purpose of the entire construction is to definitely stabilize the movement of the diaphragm 23 between the resilient member 32 and the lever 34 which is weighted with the balance weight. In that way, the control of the amount of fuel entering through the port 17 is governed and the exact amount of fuel can be further governed by means of the valve 44 in the supply line.

In the specific construction shown, there are many features not heretofore anticipated by the art, and although I have shown a particular arrangement of the component parts constituting the device, I am fully cognizant of the fact. that many changes in the form and configuration of the component parts may be made without affecting the efficiency or operativeness of the device, and without departing from the spirit of my invention or the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent in the United States is:

1. In a carburetor, the combination comprising a throat member having an air passage therethrough, a housing providing a fuel regulating chamber adjacent said throat member, a fuel-discharge assage extending from said chamber to a fuel jet opening into said throat, flow restricting metering means disposed in said discharge passage, said regulating chamber having an open side communicating with the atmosphere, a pliable diaphragm movable between inner andiouter positions closing said open side of said chamber, spring means cooperatively enin the port passage, to admit fuel through the tubular.

passage to said chamber, a valve controlling lever having a first part operatively connected to said spring means and diaphragm, and a second part extending at substan tially a right-angle to the said first part, said second part of the lever overlying the opening of said tubular passage to the chamber and having its end engaging a wall portion of said housing in pivotal support of the lever thereon, said lever pivoting in response to movements of said diaphragm such that said second part thereof is displaced toward and away from said tubular passage correspondingly to diaphragm movements toward and away from its said outer position, and a pin extending in said tubular passage between said second part of the lever and said ball valve effective in the pivoted position of the lever corresponding to the outer position of the diaphragm, to dispose and retain the ball valve on said valve seat, said lever upon diaphragm'movement in the direction of its said inner position, pivoting to raise said pin from the ball valve and thereby releasethe latter for fuel pressure response to open said port passage and admit fuel to said chamber.

2. In a carburetor, the combination in accordance with claim 1, wherein a pivoted counterweight lever is disposed substantially parallel to said diaphragm, said counterweight lever is disposed substantially parallel to said diaphragm, said counterweight lever having a mid fulcrum, a weighted free end, and an operating endiconnected to said diaphragm.

References Cited in the file of this patent UNITED STATES PATENTS 1,933,379 Mock Oct. 31, 1933 2,067,221 Winter et a1. Ian. 12, 1937 2,068,938 Viel Q. Jan. 26, 1937 2,084,377 Barbarou June 22, 1937 2,141,365 Schuttler Dec. 27, 1938 2,220,229 Grove Nov. 5, 1940 2,348,388 Jenkins May 9,1944

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