US1494949A - Doorlock - Google Patents

Description

May 20 '41924,

s. D. BUTTERwoRTH -DooRLo'cK..

Filed June 16; .1922 y gnenfofc Slim/EL 27. BUTTER warm Game# Patented May 2G, 1924.

istie SAMUEL D. BUTTERIVG'RTH, OF LANSING, MICHIGAN.

DOORLOCK.

siding` at Lansing` in the county of Ingham` and State of Michigan7 have invented certain new and useful Improvements in Doorlocks7 of which the following is a specitication.

This invention relates to locks and has for its object a simple lock of cheap construction which is especially adapted for screen doors or other closures where a cheap but effective lock is desired.

It is the object of this design of lock to provide a bolt that requires no retractor and which may be dead-locked against retraction to form a suitable lock to prevent the opening` of the door.

The lock has a sliding bolt provided with a rubber head which forms notl only a latch but a buffer to prevent the slamming of a screen door by the ordinary spring that is attached to it. The slamming of'screen doors is a very objectionable practice but is inherent in almost all screen doors. due to the employment of a spring for closing them. Various devices in the way of buffers have been used to obviate this noise. My latch not only obviates the noise by providing a suitable buffer, but positively holds the door closed by a latch action.

Furthermore. this latch and buffer is of such construction that it may be very easily dead-locked so as to provide a lock for the door and avoid the necessity of hooks or other locks that are commonly used forthis purpose.

In the drawings Fig. 1 is an elevation of the lock showing the lock casing.

Fig. 2 is an elevation of the lock parts with the cover plate removed.

Fig. 3 is a section on the line 3 3 of Fig. 2.

Fig. 4 is a section on the line 4 4 of Fig. 2.

Fig. 5 is a detail of one form of key that may be used.

The lock casing is made as cheaply as possible and comprises a face plate a provided with lugs b turned inwardly. The rest yof the lock case can be made of a shallow stamping with the flanges c. d, and e turned up to form the sides of the lock casing. while the body of the stamping f forms the front plate of the lock casing.

Application Yfiled June 16, 1922. Serial No. 568,685.

Out of the front plate the lugs g may be struck out to form guides for the sliding` rods it. These rods connect with the slides that slide through the face plate and these in turn are connected by the cross bar On a pin the rubber roller on, is jour naled to turn, the front plate is forced out as at a and the. cover plate is forced out as at 0 to provide a. socket of suiiicient proportions to permit the retreat of theroller into the lock casing when it strikes the striker plate (not shown). The coil springs (I engage around the rods t to tend to project the bolt outwardly.

. The roller m being made of rubber or other soft deformable material will make no noise when it strikes the striker plate. In screen doors. a coiled tractile spring normally pulls the door closed with a bang against a door stop which is normally the only way to stop the door from passing through the door opening, but with the construction I have described the doorstep for the screen can be done away with entirely and the roll fitting into the striker plate recess will stop the door without any noise whatever. the roll being of rubber, obviously there will be no noise due to the contact. The screen door may be opened by giving it a good pull on a suitable handle for this purpose (or a push from the inside).

I-Iowever, it is often desirable to lock screen doors on the inside. This can be Vvery easily done-or for that matter the door may be locked from the outside-an uncommon thing for screen doors. The cover plate n and'ffont plate f are each provided with a circular opening s in which are rotatably supported the hub ends ofthe dead-locking member t. This hubis provided at each end with a key socket tl/adapted to be irregularly formed to take an irregularly formed end of a key 100. Each of these openings s is provided with two olfset slots c one-fourth of a turn removed from each other, this permits the insertion of a key with irregular end such as shown in Fig. 5, the point 7/ of the key going into the recess e in the hub while the slot 101 in the side of the key permits the key to straddle the segment 1 around. the openings s. This arrangement of two offset recesses 90 apart is a very important feature of the dead-locking of this lock7 which requires the dead-locking lever to be turned through a complete quarter of a turn, no more and Yand spring 2 is such as to always give a complete and full quarter turn and no more before the key can be extracted.

Of course it is old to dog a latch bolt with a beveled head but the purpose of this isrnot to prevent the opening ot the door by pushing or pulling on the door but by reti-acting the bolt with the usual rollback. I use the dead-locking` member to )revent the door from being pushed or pulled open.V Hence the combination oit the deadloeking member with abolt having aroller strike portion is a new one accomplishing new results.

Y What I claim is:

f l. In a lock, the combination of a casing, provided with a front plate and cover plate each having an opening therein provided with olset slots s aced about 90 a slidin@VV bolt sliding in said case7 means for yieldingly projecting said bolt, a dead-locking member having a hub portion j'ournaled in said openings in the coverI and front plate and having its ends recessed to receive a key, and a key that lits into the ends ot said hub member and is provided with a slot to straddle the easing segment between the two offset slots to prevent thewithdrawal of the key until a complete quarter turn is taken, said dead-looking member having a Vportion adapted to engage a portion of the bolt to prevent the retraction or" the same when in 'one position.

Q. In a lock, the combination otl a easing` provided with a front plate and covcrplate each having an opening therein provided with offset and spaced slots, a slidingbolt sliding in said case, means for yieldingly projecting said bolt, a dead-locking'member having a hub portion journaled in said openings in the cover and .front `plate and having its ends recessed to receive a key, and

a key that lits into the ends of lsaid hub Y member and is provided with a lateral projection adapted to engage under the easing segment between the offset slots to prevent the withdrawal of the key until the required degree of turn is taken, said dead-locking memberhaving aportion adapted to engage a portion o1 the bolt to prevent the retrac-4 tion oit the same when in one position.

, In testimony whereof I ai'lix my signature.

Images