US2845789A - Sliding window and door lock - Google Patents

Description

Il n' INVENTOR HERMAN H. K|sTNE.R

I 0 3 43a33m c l 2 o H/ S ATTORNEY5.

Aug. 5, 1958 H. H. KlsTNER summe wmnowmn nooR Locx Filed Sept. 10, 1956 United States Patent O SLIDING WINDOW AND DOOR LOCK Herman H. Kistner, Glen Ridge, N. J. Application September 10, 1956, Serial No. 608,865 s claims. (cl. 70490) This invention relates to window sash and sliding door locks and similar devices, and is an improvement on the closure bolting and locking means described in my Patent No. 2,076,897, dated April 13, 1937, as the result of experience and the demand for a better lock of this type.

In the process of installing locks of the kind illustrated in my patent, particularly in a window sash made of very hard wood, difficulties have beeen encountered due to the hardness of the wood and to slight inaccuracy in the size of the hole made for the lock, causing the bolt to bind in the outer shell or causing the shell to interfere with the weather stripping, and weakness of the coil spring or other defect in the construction of the lock has permitted the bolt to be turned and withdrawn by means other than the proper key, and endangering the weather tightnes of the window or the security of the lock in such cases.

These, and other shortcomings met with in actual installations over a period of some twenty years, have now been overcome by my improvements, as hereinafter described, with reference to the embodiments of the invention shown in the accompanying drawings, wherein like reference numbers represent the same parts in the several views.

In the drawings, Fig. 1 is a vertical section through the meeting rails of a sliding sash window showing the lock shell and keeper in axial cross section and the bolt in side elevation in unlocked position; and Fig. 2 is similar view showing a key in the lock and the bolt in partly locked position turned at 45 to its position in Fig. l.

Fig. 3 is a horizontal axial cross-section on the line 3-3 in Fig. 1, showing the bolt in fully locked position; and Fig. 4 and Fig. 5 are transverse vertical cross-sections on the line 4 4 in Fig. 2, and 5-5 in Fig. 3, respectively.

Figs. 6 and 7 are a side view and an end view of a shell intended primarily 'for metal frames; and Figs. 8 and 9 are similar views of a modied form of shell adapted for both wood and meta-l frames, these shells preferably being somewhat smaller than the shell illustrated in Figs. 1 to 5.

Fig. 10 is a disassembled perspective view of the shell, bolt, actuating spring, locking pin, and keyway wards, the key itself being similar to that shown in Fig. 6 of my prior Patent No. 2,076,897.

My improved closure bolting and locking means has all the advantages of my patented device, namely, few working parts of simple rugged construction which are easily installed, and which may be positioned at any desired part of the meeting members to be locked together so as to be invisible from the exterior and which cannot be opened from the exterior without demolishing one of the locked members.

Other advantages will appear from the following description of a preferred form of the invention as applied In the illustrative embodiment of the invention shown herein (see Figs. l to 5), a tubular body or shell 11, housing the sliding bolt 12, is mounted in the upper rail 13 of the lower sash of a sliding window with its axis horizontal and at right angles to the plane of the window, and a thimble 14 is mounted in the lower rail 15 of the upper sash with its axis in alinement with the axis of the bolt when the window is closed. The thimble 14 is preferably made of hardened steel and may be provided with a iiange 16 which is secured to the rail 15 by small screws 17 to hold it in place in a suitable opening on the inside of the rail in which it is a force lit. The bolt 12 is also made of hardened steel, so that when engaged in the thimble it cannot be sawed or cut through by any means that can bebrought to bear on either of these two members.

The shell 11 is provided with an internal shoulder 18 at its end adjacent to the upper sash, which for convenience will be referred to as the inner end of the shell because it is forced into a suitable bore in the sash from the opposite direction. A spring 19 within the shell is provided for retracting the bolt 12, and this spring also retains the bolt in locking position. When assembled in the shell 11 the spring 19 is compressed in place, with one end abutting against the inner shoulder 18 and the other end pressing against a ange 20 on the bolt 12 near its middle to force it toward the large open end of the shell when the locking pin 21 in the bolt is in alinement with the lengthwise portion 22 of the locking groove 23 in the circumference of the shell 11. This locking groove has a notch 24 at its dead-locking end to retain the bolt in its locking position as in my Patent No. 2,076,897.

,The transverse portion of the groove 23 is provided with a notch 25 on the inner side of its cross wall forming a trap for the pin 21, and the bolt itself is formed with a projecting nubbin or 'point 26 at its outer end, which cooperates with the notch 25 to prevent unlocking the bolt by a screw-driver or small implement such as a pencil with an eraser on its end. It has been found that such an instrument can be substituted for the special key supplied with the lock and inserted in the open end of the shell so as to apply pressure on the end of the bolt in my patented lock and dislodge the locking pin 21 from the groove 24, whereupon rotation of the instrument while applying sufficient pressure to the bolt to develop friction vbetween the rubber and the fiat end of the bolt can result in turning it suiiiciently to free the bolt, particularly should the spring 19 be abnormally weak because ot age, abuse, or other cause. But, in my improved lock the notch 25 is so positioned as to catch the pin 21 and prevent further rotation of the bolt by such an illicit mode of operation. Thus my new lock is a substantial improvement upon the patented one and no more costly to manufacture because of this feature.

The bolt 12 and spring 19 may be assembled and disassembled in the shell 11 by inserting them in the open end of the shell and inserting the pin 21 laterally through the groove 22 in the shell into the transverse opening 28 in the outer end of the bolt. A drive out hole 29 is provided in the shell in transverse alinement with the pin 21 when the bolt is in locking position to permit the pin to be driven out of the bolt whenever it is necessary to dismantle the lock.

The shell is provided with inside guards in the form of small pins 30 such as drive screw pins, which project into its interior at spaced points and stand in the way of the insertion of any sort of implement other than a key provided with matching longitudinal channels 31 as Patented Aug. 5, 19,58

shown in Fig. 2. circumferential channels 32 permit the key 33 to be rotated after it has been inserted into the shell far enough to engage the bolt 12 with its keeper 14, this rotation serving to turn the locking pin 21 in the groove 23 so as to permit it to enter the locking notch 24 under the action of the spring 19 upon releasing the inward pressure on the key, thereby dead locking the bolt in its engaged position with the keeper 14.

ln order to prevent deiiection of the` side wall of the shell adjacent to the slots 22, 23 and notch 24 by pressure on its exterior when driven into hard wood, the ange 20 on the bolt is made wide enough to project under and support this lip portion of the shell in the withdrawn or unlocked position of the bolt, thereby eliminating trouble heretofore experienced with this type of bolt lock due to binding of the bolt in the shell when the latterhas been forced into a tight tit in a hard wood sash.

` The outer surface at the inner end 35 of the shell is reduced in diameter sutliciently to prevent it from splitting the edge of the bore in the wood in which it may be installed or from interfering with the weather stripping (not shown) with which many sliding sash windows are fitted.

Figs. 6 to 9 illustrate shells for metal window and metal sliding door frames which are secured by screwing them into suitable holes bored in the outer and inner walls thereof. The inner or the outer wall of the window or door may be threaded to iit screw threads turned on the outer surface of the shell, which may be smooth or knurled otherwise.

In Figs. 6 and 7, the key receiving end of the shell 40 is enlarged and provided with threads 41, and lengthwise channels 42 are made in the outer surface of the threaded portion of the shell to receive thel heads of the drive screw pins 43 to prevent interference between the latter and the metal wall of the window or door when the lock is installed. The inner end of the shell may be knurled, as shown in Fig. 6; or the threads 44 may be out -on the inner end of the shell 4S and the outer end left plain as shown in Fig. 8. In the latter case, the drive screw pins 46 will have countersunk heads, as in Figs. 8 and 9, tiush with the outer surface of the shell 45. The shells 40, 45 may be readily screwedinto place by means of a grooved implement similar to the key 33, whereby the longitudinal grooves 31 will engage with the pins 30, 43 or 44 to rotate the shell and cause the screw threads on the shell to engage those of the inner or outer wall of the window or door.

The shell may be threaded on both ends and engage in threaded openings in both the inner and outer walls of the window or door, in which case the openings in the inside walls must be suiciently larger than those in the outside walls to permit the inner threaded end of the shell to pass through the inside wall freely to engage the threads of the outside wall at about the same time that the threads on the outer threaded end of the shell engage the threads of the inside wall.

For metal windows and doors the shells may be somewhat smaller in length, and also smaller in diameter,

than for wooden windows and doors to conform with the thinner construction of the former, the working parts being proportionally diminished in size. The finish of the shell and exposed parts of the lock may also be adapted lto that of the windows or doors upon which they are to be used.

The invention is not restricted to the exact forms and materials as described herein, but what I claim is as follows:

l. A key operated sliding bolt lock for closures comprising a bolt rotatably and slidably mounted in a tubular casing to project therefrom at one end in locking position, said bolt having a transverse pin projecting from near its end remote from its bolting end and an intermediate shoulder between said pin and bolting end, and said casing having 'an inner shoulder at the bolting end and its opposite end being open to receive a key, a channel extending longitudinally in the side Wall -of said casing toward its key receiving end to receive said pin, said channel terminating at a lateral abutment remote from said key receiving end extending circumferentially and functioning as a bayonetslot, the wall of said slot on its side remote from said key receiving end having a notch at an intermediate point serving as a trap for said pin and the end of the wall of said slot remote from said channel having a notch extending axially towards said key receiving end and serving as a retaining means for preventing unlocking movement of said pin, a spring in said casing surrounding said bolt between the shoulder in the casing and the shoulder on said bolt, said springv pressing said bolt towards the key receiving end of said casing to retract it when said pin is in alinement with said channel.

2. A keyv operated sliding bolt lock for closures as set forth in claim l wherein the key receiving end of the bolt is provided with an axial protuberance preventing contact between the greater part of the end of the bolt and a fiat ended implement inserted in the key receiving opening.

3. A key operated sliding bolt locky for closures as set forth in claim l wherein an end of the casing is threaded on its exterior to engage in a threaded opening in one wall of a metal closure member.

Y 4. A key operated sliding bolt lock for closures as set forth in claim l wherein the intermediate shoulder on the bolt is in the form of a wide ange underlying and supporting that portion of the wall of the casing adjoining` said bayonet slot and channel when said bolt is in retracted position.

5. A key operated sliding bolt lock for closures as set forth in claim l wherein the casing is provided with an opening through its side wall in alinement with the transverse pin in its locking position permitting dislodgment of said pin from said bolt in disassembling said lock.

References Cited in the le of this patent UNITED STATES PATENTS 909,933 Price Jan. 19, 1909 2,098,189 Kstner Nov. 2, 1937 2,098,249 Kistner Nov. 9, 1937

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