US404467A - Sash-fastener - Google Patents

Description

(No Model.)

2 sheets-sheet 1L R. J. BUCHANAN.

SASH FASTENER.

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UNITED STATES PATENT OFFICE.

ROBERT JARVIE BUCHANAN, OF PITTSBURG, PENNSYLVANIA.

SASH-FASTEN ER.

v SPECIFICATION forming part of Letters Patent No. 404,467, dated June 4, 1889.

Application filed February 2l, 1889. Serial No. 300,751. (No model.) Y

To all whom t may concern.'

Be it known that I, ROBERT JARviE BUCH- ANAN, a subject of the Queen of Great Britain, residing in Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Sash Locks and Holders, of which the following is a specification.Y

The object of myrinvention is to provide simple, inexpensive, and readily-manipulated devices' for holding a wiiidow-sa'sli in any desired position, and for securely locking the sash to prevent unauthorized persons from opening it.

In the accompanying drawings, illustrating` my invention, Figure l is a front elevation of my'improved sash holder and lock, showing also the rack-plate in section, with which the holder engages, and the bolt-hole for the locking-bolt. Fig. 2 is an inside view of the lock and holder, showing also the rack-plate in section. Fig. 3 is a front view of the rackplate. Fig. 4 is an end view of the lock-frame, showing also the ends of the locking-lever and bolt. Fig. 5 is a front elevation of asurface lock and holder, showing the bell-crank lever arranged to support an upper window-` sash and to lock it when closed, the rack- Fig. 6 is an inside view of same with a modiiied rack-plate surface-lock with my improvements applied. Fig. S is a front elevation of a modified form of rack-plate. Fig. 9 is a detail view of the bell-crank lever and its handle; Fig. 10, a detail View of the devices for locking the bellcrank lever to the lock-casing; and Fig. ll is la view of the front plate of the lock, showing how the bell-crank lever is locked to the casing.

Referring iirst to the iirst four iigures of the drawings, it will be seen that the bellcrank lever or bolt A is pivoted to the casing or frame B, at a, near its edge. In this instanceI have shown a inortise-lock frame.

The arm of the bell-crank lever projects beyond the side or edge of the lock-frame, and the arm g/ extends downwardly, as shown, and is provided with a knob C, the shank of which projects through a curved slot c in the lockfranie, the knob C being on the outside of the frame, so as to be readily manipulated. The

Fig. 7 is a perspective view of ay slot c is formed in the aro of a circle from the axis of the bell -crank lever A as a center. The outer en'd of the arm is preferably inclined or curved, as shown, and engages With the teeth d of the rack-plate D, which is secured to the window-frame. Preferably these teeth are inclined or curved, as represented, to correspond'with the curvature of the end of the arm so as to afford an even bearing and avoid or counteract the lost motion.v4 The tooth 'd3 on t-lie arm m engages with the tooth d2, formed by a` notch d of. rack-plate when the window is closed and is to be locked; but when this device is not used a bolt` E of ordinary construction may be substituted, which is normally shot out by a spring e, as shown in Fig. 2. The bolt is provided with a knob E', the shank of which projects through a.

slot e in the frame or casing B.

It will be understood that when the windowsash is down the tooth d2 of the rack-plate D engages with the toothy d3 of the bell-crank lever A, or the bolt E enters the recess E2 in the rack-plate D, as the case may be, and locks the sash in position, so that it cannot be raised until t-he bell-crank lever or bolt is withdrawn. The handle or knob E of the bolt being on the inside of the Window it can only be moved by some one on the inside, thus rendering the sash burglar-proof. When the bolt is drawn back and the sash is elevated, it may be held at any desired elevation by means of the bell-crank lever A, the arm .fr of Which engages with the teeth d in the rackplate.

As will be seen, the lever A is so pivoted, and its arm y is so proportioned relatively to the arm a; that the arm is held in engagement with the rack by gravity, so that as soon as the window is raised to the desired position the arm will immediately engage with a tooth cl on the rack-plate, and will hold the sash in the position to which it is elevated. Vhen it is desired to lower the sash, the knob C is moved along the slot c in the direction indicated by the arrow,` and the arm :1:

pieces and the rack, and the rack is arranged between the guide-strips D2 of the windowframe. The devices when thus arranged are of a suitable construction to support a lower window-sash when open or lock it when shut, or to support an upper window-sash at any desired elevation or to lock it when closed.

` In Figs. 5 and 6 a construction similar to that shown in Figs. l and 2 is illustrated, except that the bell-crank lever is reversed and the slot c is in like manner reversed to accommodate the change in position of the 1ever A. As thus arranged my improvements are adapted to lock a lower window-sash when shut or to support it when open, and also to support an upper window-sash when in any position, and to lock it when closed. Then the tooth d3 on the arm w engages with the tooth 'd2 on the rack D, secured to the window-frame,

the sash cannot be lowered without withdrawing the arm into its frame or casing, and when the tooth d3 engages with the tooth (Z2, as indicated in Fig. 5, the window cannot be raised without withdrawing the lever th erefrom.

As shown more clearly in Figs. l and 3, the rack which I preferably employ is provided with curved teeth (Z, which are joined by curved front faces d. This construction is desirable, as before explained, to allow the arm to move easily away from the rack or into position in the rack when in use.

In Figs. l0 and ll I have shown devices used in connection with my improved lookin g devices for locking them positively to the casing or frame of the lock. As shown, the shank c2 of the knob C extends through the arm y of the locking-lever and is provided on its outer end with a spring c3, which is seated in a recess c'1 in the arm y, and which also bears against the flange or washerc5, secured to the end of the shank c2.

The front plate of the casing is provided with a curved slot c, as before explain ed,.and this slot is formed at intervals with notches or recesses c', with which engage teeth or lugs c6 on the shank c2 of the knob C. Vhen the teeth thus engage with the notches in the slot, the knob cannot be moved back and forth in line with the slot to manipulate or move the locking-lever A; but by drawing out the knob against the force of the spring c3 the teeth will be withdrawn from the slot e and the knob, shank, and teeth may be turned so as to assume the general direction of the slot and may be readily moved back and forth to operate the locking-lever.

It may sometimes be desirable to apply my improvements to a window-sash where it would be undesirable to cuta very large mortise for the casin g which would tend to weaken the frame. Vhen this is the case, I employ a surface frame or case, such as shown in Figs. 5, 6, andl 7.

My improved sash locks and holders are especially designed for use in connection with sashes without counterbalancingweights such as used, for instance, in railway-cars* but some forms of the locking mechanism are not thus limited in their use.

It is obvious that the tooth d3 on the bellcrank lever and the tooth (Z2 in the rack-plate may be omitted, as the lever will support and lock a sash by reason of the engagement of the end of the arm with the teeth on the rack-plate; but I prefer to form the lever and the rack as illustrated. It is obvious, also, that the lock may be attached tothe windowframe and the rack applied to the sash.

I claim as of my own inventionl. The combination, substantially as hereinbeforc set forth, of the lock frame or casing, the bell-crank lever pivoted thereto, and having an outwardly-projeeting arm formed with an outer end curved from the axis of the lever as a center, a rack-plate having teeth curved to correspond with the curved end of the arm x, and a handle (l, secured to the inwardly-projecting arm of the bell-crank lever and working in a curved slot in the lock frame or easing.

2. The combination, substantially as hercinbefore set forth, of the lock frame or casin g, the bell-crank lever pivoted thereto and hav ing an outwardly-projecting arm and an in wardly-proj ecting arm y, the knob or handle C, its shank c2, projecting through a curved slot in the lock-casing and through the arm y of the bell-crank lever and adapted to turn therein, a spring interposed between the inner end of the shank and the bell-crank lever, and the teeth c6 on the shank, which engage with notches c' formed in the curved slot of theloclccasing, for the purpose specified.

In testimony whereof I have hereunto subscribed my name.

ROBERT JARVIE BUCHANAN. lVitnesses:

` Jas. 1I. MCNALL,

W. H. JONES.

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