US1558705A - Electric lock - Google Patents

Description

Oct. 27, 1925' J. H. MILLIGAN ELECTRIC Lbcx Filed April 5. 1924 23 Fig 3E I fnve nl fir,

JoephHMilligan Patented o... 21, 1925.

UNITED STATES 1,555,105 PATENT OFFICE.

- JOSEPH H. KILLIGAH, OI EAST HOLLISTON, I ASSACEUSETTS.

ELECTRIC LOOK.

Application filed April 6, 1924. 8er1a1'Ro..704,384.

To all whom it may concern:

Be it known that I, J osnrn H. MILLIGAN,

a citizen of the United States, and a resident of East Holliston, in the county of Middlesex and Commonwealth of'Mas'sachusetts, have invented certain new and useful Improvements in Electric Locks, of which the following is a full and exact specification.

This invention relates to looks actuated by electricity, and it has for its object the effecting of means forfretaining the bolt against unwarranted dislodgment from either of its set positions; and also to improvement in general details of construction. In carrying out my invention I connect the bolt with two solenoids for moving it in and out, and with a latch adapted for retaining the bolt in place, but to release it as soon as either solenoid is energized.

In the drawings forming part of this specification, Fig. 1 is an elevation with its cover-plate removed, of a lock embodying my invention. Fig. 2 is a sectional view thereof through the line 22 in Fig. 1. Fig. 3 is a section on the line 33 in Fig. 1. Fig. 4 is a sectional view of the bolt and surround- ,ing plate. Fig. 5 is an enlarged side View of one of the solenoid plungers. Fig. 6 is a cross section of the same on the line 6-6 in Fig. 5.

The lock-case is of well known construction, consisting of a rectangular box 1 closed by a cover-plate 2. Through the end-plate 3 is a suitable opening slidably receiving the bolt 4 which is rigidly connected through an arm 5 with'the plunger 6 of a solenoid 7, whereby upon the energizing of the latter the bolt is retracted from its locking position.

An arm 9 having an elbow 10 attached to an end of the plunger 11 of a solenoid 12 serves to throw the bolt into its locking position when energized. Rising from the arm 9 is a lug 13 adapted to be engaged by a latch 14 yieldingly pressed against the arm by a helical spring 15. The lug is so disposed that when the latch is against the arm at one end of the lug 13, the bolt 4 is held in its locking position, while the location of the latch at the other end of the lug holds the bolt in its inner position.

For automatically releasing the latch, its tail 16 is near the plunger6 which is compos'edof soft iron, whereby the instant the solenoid 7 is energized, the plunger also becomes ma etic and attracts the tail 16 and removes t e latch fromitsinterferenc'e with the-bolt,'while at the same time the plunger 1s retracted and the bolt drawn inward.

Attached .to the solenoid 12 is an iron finger 17 whose end-19 is supported close to the end of the latch 14 and 1s adapted when magnetized by the energizing of the soleno1d to attract the latch and thereby to re lease the bolt.

To render easier the movement of the bolt, its surfaces are each formed with a groove 20, as shown in Fig. 4, in which are two balls 21 each retained in a hole in the sleeve 22 by a small screw 23, this sleeve being preferably integral with the wall or plate '3, and the arm 5 reaching through a slot 24 in the sleeve. These ball-bearin s are provided for the purpose of making t e bolt slide more easily.

For the same object, the plungers 6' and 11* are each provided with ball bearings 25 mounted in the ends of terminally concave' brass lugs 26 transversely introduced into the p ungers, as shown in Figs. 5 and 6. Likewise the latch 14 is provided with a ball 27 at the side adjacent the lug 13 when the bolt is in both its locked and unlocked positions; such ball being inserted in a small hole drilled through the latch and retained loosely therein by pressing inward the edges of the hole just enouglr to hold the ball in place but not enough to interfere with its rotation. It is only necessary to have this one ball since both when the bolt is locked and unlocked there is danger of friction upon the bolt to hold its lug 13 too tightly against the side of the latch and thereby to prevent the latters rising through the magnetic attraction of the plungers 6 and 11, and so failing to release the bolt.

As shown in Fig. 1, the plungers 6 and 11 do not extend much more than half way into the solenoids 7 and 12, respectively, the remainder of the space within each of the latter being occupied by an iron core 30, for the purpose of aiding in the final pull of the solenoids upon the plungers; thereby making it certain that the bolt will be thrown to its extreme limits and the latch 14 will engage the lug 13.

What I claim as my invention is:

1. An electric lock comprising a bolt, a solenoid having a plunger therein adapted when the solenoid is energized to throw the bolt, and a pivoted latch adapted to engage and retain said bolt at an end of its throw, a portion of said latch being adapted to be attracted by said plunger when the solenoid is energized and thereby to release the bolt from the latch.

2. An electric lock comprising two stile end of said latch being adapted to be at-' tracted and to release the bolt when the other solenoid is energized.

3. An electric lock comprising a bolt, a

solenoid, a plunger in said solenoid connected with sald bolt, a latch disposed transversely over said plunger and bolt, and a spring yieldingly retaining said latch normally in engagement with said bolt to prevent its movement, said latch being pivotally supportedat an intermediate-point and having its end opposite that engagin the bolt located near the periphery of sai plunger, whereby when the plunger is rendered magnetic by the energizing of its solenoid it attracts the adjacent end of said latch and releases said bolt.

In testimony that I claim the fore oing invention, I have hereunto set my han this 3rd day of April, 1924.

JOSEPH H. MILLIGAN.

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