US1509816A - Air-brake valve - Google Patents

Description

Sept. 23, 1924.

W. D. KENDRICK AIR BRAKE VALVE 1.922 2 Sheets-Sheet 1 Filed March 31 Sept. 23, 1924. 1,509,816

w. D. KENDRICK may. 5.

Patented Sept. 23, 1924-.

UNITE stares PATENT QFFICE.

WILLIAM I). KENDRICK, OF MIAMI, ARIZONA.

AlR-BRAKE VALVE.

Application filed. March 31, 1922.

employed in connection with automatic air-,

brake systems, and commonly known as angle cocks, and its objectis to provide a novel and improved means for locking the valve-controlling handle against accidental displacement.

The invention also has for its object to provide the cock with a novel and improved arrangement of ports whereby leakage is effectually prevented.

The objects stated are attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing, wherein:

Figure 1 is a side elevation of the cock showing the handle-locking means; Fig. 2 is a plan view thereof; Fig. 3 is an end view; Fig. is a horizontal section of the cock; Fig. 5 is a similar View showing the turning plug in another position, and Fig. 6 is a horizontal section in the plane of a bleed port.

Referring specifically to the drawing, 5 denotes the body of an angle cock containing a turning plug which is operated by a handle 6. The turning plug has a squared end portion 7 on the outside of the body and at the top thereof, on which is mounted and secured a hub 8 having a laterally projecting ear 9, to which the handle 6 is pivoted by a cross pin or rivet 10, the inner end of the handle being recessed to straddle the ear. This end of the handle also has a top lug 11 on which, presses the free end of a fiat spring 12 fastened to the hub 8. The spring 12 presses the handle 6 downwardly. The handle is pivoted to swing on an axis transverse of the axis of the turning plug. v

The top of the body5has an outstanding flange 13 having a curved edge 1-1, the center of the curvature of said edge being the axis of the turning plug, so that a latch pin 15 carried by the handle 6 may ride along said edge when the handle is swung to open and close the cock. The pin 15 is located Serial No. 548,374.

close to the inner end of the handle 6 and it depends from the latter.

At one end of the curved edge 141 of the flange 13 is a stop shoulder 16 against which the pin 15 abuts when the handle 6 is swung to close the valve, and at the other end. the flange has a keeper recess 17 adapted to receive and seat the pin when the handle is swung to open the valve. The flange also has an edge recess or notch 18 inter mediate the shoulder 16 and the recess 17, which is entered by the pin when the handle svung to a position intermediate the opening and closing positions, as shown in Fig. 2. The last-mentioned position of the handle controls a bleed port 19 in the bod 5, as in my Patent No. 9 13,55 1, dated December 1, 1909. The port 19 is provided with a dust cap 20 carried by a flat spring 21, and working under a bridge piece 22 which limits the swing of the dust cap outwardly of the port.

lVhen the valve is open, the latch pin 15 seats in the keeper recess 17 and securely holds the handle 6 to maintain the open position of the valve. The spring 12 pressing down on the handle keeps the latch pin firmly seated, so that the handle cannotaccidentally swing to closethe valve. It will also be noted in Fig. 2 that the keeper recess has a lateral curve which assists to hold the latch pin. The hose end of the body 5 also has a top abutment 23 which is engaged by one side of the handle when the latter is in valve-opening position. This abutment is on that side of the handle to ward which the latter must be swung to close the valve, and hence before the handle can be moved in this direction it must be lifted clear of the abutment against the tension of spring 12. This can be readily done as the handle is pivoted to the hub 8. When the handle is lifted or swung upwardly to clear the abutment 23, the pin 15 also leaves the recess 17, and the handle may now be moved over against the stop 16 to close the valve; or it may be moved to the intermediate position, in which latter position it is held by the pin 15 seating in the keeper notch 18. The spring 12 acts as before to hold the handle down and to keep the pin 15 in the notch 18.

The top of the flange 13 also has a stop shoulder 24 for the side of the handle 6,

functioning in the same manner as the abutment 23.

' side port 29.

Figures' l to 6 illustrate the improved arrangement of ports whereby leakage is effectually prevented. The turning plug 25 in the body 5 is hollow and has a main transverse port 26 located somewhat off to one side of the center of the plug, and the air passage 27 in the body 5 is ofiset at the side of the plug to correspond to the offset posit-ion of the port 26. The plug 25 also has asnia'llside port 28, and lower down in the plane of the bleed port 19, it'lias a small \Vlien the cock is in full. open position, the main'port 26 registers with the passage 27 as shown in Fig. 4. To bleed the hose, theplug 25 is turned to the positionshown in Fig. 5. The ports 29 and 19 now register, the port 28 registers with the hose end of the passage 27, and the main port' 26 ofthe plug is lapped to cut off the hose end of the passage 27 from the trainpipe end of said passage. hen the cock is to 'be completely closed, the plug 25 is turned until it is stopped by the shoulder 16 'hereinbefore described. The port 28 has now moved away from the passage 27 and itis lapped by' the wall of the body 5, and the'po'rt 29 has also moved away from the port'19 so that it no longer registers tl1ere with. In the closed position of the cock, all'th'e ports are lapped, and by reason of the offset position of the passage 27 and the central location of the bleed port 19, a maximum lapping surface is obtained so that there will be no leakage of air.

7 1. A valv e'of the character specified comprising a" a sin'gfhaving a lateral segmental flange provided at one end with an'approximately L-sha'ped locking slot and a stop lug forming on'ewall ot' the slot, a plug having a spring pressed pivoted handle provided with a depending look pin engaging the outer edge of said segmental flange and adapted to be received in said approximately L-shaped slot, said stop lug being era-tended beyond the outer edge of said flange and being in the path of travel of said pin whereby to limit the movement of the pin and guide the same into said slot.

2. A valve of the character specified comprising a casing having a lateral segmental flange provided at one end with an approximately L-shaped locking slot and a stop lug forming one wall of the slot. a plug having a spring pressed pivoted handle provided with a depending lock pin engaging the outer edge'of said segl'i'iental flange and adapted to be received in said approximately Lshalped slot, said step in; being extended beyond the outer edge of said flange and being in the path of travel of said pin whereby to limit the movement of the pin and guide the same into said slot. the upper surface of said flange being n'ovideil with a stop shoulder adapted to engage one side of said handle to co-operate with said pin and said slot in holding the handle in place.

The construction set forth in elaiiu 2. an end portion of said casing being provided with an abutment to engage an adjacent portion of said handle when the pin is in said slot.

In testimony whereof I aflix my signature.

WILLIAM D. KEYDRI (,"K.

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