Патент USA US2136216код для вставки
Nev. 8, 1938. 2,136,216 J. F‘ MARTIN VALVE LOCK Filed May 2, 1938 INVENTOR JULIAN F. MARTIN BY " ATTORNEY \ Patented Nov. 8, 1938 UNITED? 2,136,216i as 2,136,216" VALVE LOCK Julian‘ F. Martin, (llevelaniiokla. Application May 2, 1938, Serial No.- 206,501 2 Claims. This invention relates to valve locks and par I0 is thus permanently attached to the valve casing and constrained by hinge l l to rotate ver An object of this invention is to provide a tically relative to the valve casing. By rotation simple form of lock for plug cocks which cannot about hinge II, the free end of lock bar Ill may be opened by unauthorized persons without de be caused to enter, or be removed from, slot 1 5 tection of their tampering therewith, and which When the plug 2 is turned in the closed position, may be easily unlocked and opened by authorized that is, when slot 1 and port 8 are at right angles persons. to the passageways through the valve casing. Another object is to provide a lock mechanism The position of lock bar II] when the valve is to for plug cocks, which mechanism is of simple and be opened is shown in dotted outline in Fig. 1. 10 relatively cheap construction, but which is e?ec- ' When lock bar I0 is in place in slot 1, it will be tive for the purposes for which it is designed. below the level of openings 9—-9 through which a Other objects and advantages of this inven sealing strip l2 of more or less conventional form tion will become apparent from the following de and constructed preferably of frangible metal or scription and the accompanying drawing which the like, is passed, the ends of the sealing strip 15 illustrates one form of the new invention. I2 then being locked together in the usual man In the drawing: ner, so that it cannot be removed from the key Fig. 1 illustrates a side view of the valve and without being broken. locking means. With the device as described, the valve is locked Fig. 2 is a top view of the device shown in Fig. when the valve plug 2 is in the closed position, 20 1, and and lock bar I0 is in place in slot 1, and a sealing Fig. 3 is a View of the valve plug. strip I2 is looped through openings 9—9. When Referring to the drawing, a valve casing I of a it is desired to unlock and open the valve, it is conventional plug cock is ?tted with the usual only necessary to apply an upward pull to the conical plug 2 having asquare or angular turning free end of lock bar l0, which movement will 25 key 3 extending from its upper end above the quickly and easily break the sealing strip and casing l, andhaving a threaded reduced portion leave the plug 2 free for turning to the open 4 at its lower end to accommodate a nut 5 and position, by means of a wrench bar, not shown, washer 6 which serve, in the well known manner, which may be inserted in slot 1, or by any other to secure the plug in the casing. Key 3 is pro suitable means. 30 vided with a bifurcating slot 1 which extends The form and method of attachment of lock transversely through the central portion of the bar I!) will positively prevent turning of plug 2, key and in a direction which is parallel to that when the bar is in the locking position, and since of a port 8, which extends through the plug 2. the bar may be raised from the slot 1 only by Slot 1 is of substantial width and its depth is breaking sealing strip I 2, tampering with the 35 preferably substantially equal to the height of valve by unauthorized persons may be readily key 3 above the body of plug 2. Registering detected. openings 9--9 extend through key 3 at an angle, The lever action of bar I!) is highly effective preferably a right angle, to slot 1 and are posi for breaking the sealing strip and very advan tioned in the upper portion of key 3, and are thus tageous in that no special tool need be carried. 40 spaced above the bottom of slot 1. In the form of the device shown in the drawing, it will be for this, purpose by the persons authorized to open the valve, and the inconvenience of break noted that two pairs of openings 9-9 are pro ticularly to looks for valves of the plug cock type. 5 10 15 20 25 39 35 40 vided in case it is desired to use more than one 45 seal member, as will be more fully described hereinafter. A look bar [0, preferably in the form of a ?at elongated steel strip of su?icient thickness to render the same resistant to- bending, and having 50 a width only slightly less than that of slot 1 so that it may be readily received therein but with out sui?cient clearances to permit turning of the plug when the lock bar is in place, is con nected at one end to the upper rim of valve 55 casing I by means of a hinge II. The lock bar ing the seal by twisting and bending by hand, particularly in cold weather, is avoided. Fur thermore, when’the valve has been been opened, us the lock bar, by virtue of its permanent attach ment to the valve casing, is always available for relocking the valve and cannot be lost or mis placed. ' 50 It will be evident from the foregoing that the Valve lock of this invention consists of a very few simple and inexpensive parts which are easily accessible to the operator for quick and easy un locking and locking of the valve. 55 2 2,136,216 What I claim and desire to secure by Letters Patent is: 1. A look for plug cocks comprising in com bination, a valve casing, a valve plug rotatable in the casing, a turning key extending from the up per end of said plug, a bifurcating slot extend ing transversely through said key, an opening extending through said key at an angle to said slot, an elongated lock bar attached by a hinge 10 at one end to said valve casing, the free end of said lock bar being constrained to rotate verti cally about said hinge and to enter said slot When said valve plug is in the closed position, and a frangible seal member extending through 15 said opening in the key and spanning said slot,‘ said seal member being automatically broken by vertical movement of the free end of said lock bar out of said slot. 2. A lock bar for plug cocks comprising in com bination, a valve casing, a valve plug rotatable in said casing, a port extending transversely through said valve plug, an angular turning key extend ing from the upper end of said valve plug, a bi furcating slot extending through said key paral lel to said port, an opening extending through the upper portion of said key and at right angles to said slot, an elongated lock bar attached at one end by a hinge to said casing, the free end of said lock bar being constrained to rotate ver 10 tically about said hinge and to enter said slot When said valve plug is in the closed position, and a frangible seal member extending through said opening in the key and spanning said slot, said seal member being automatically broken by 15 the vertical movement of the free end of the lock bar out of said slot. JULIAN F. MARTIN.