US2073109A - Lock - Google Patents

Description

March 9, 193 7.

7 R. KIRKWOOD LOCK 2 Sheets-Sheet 1 Filed Aug. 12, 1936 lllnlihi WW AK V 6 we March 9, 1937. R.KIRKWOOD 2,073,109

LOCK

FiledAug. 12, 1956 2 Sheets-Sheet? Patented Mar. 9, 1937 UNITED STATES PATENT OFFICE LOCK Harry R. Kirkwood, Pittsburgh, Pa.

Application August 12, 1936, Serial No. 95,554

4 Claims.

The invention relates to looks involving the use of a pin tumbler lock unit for application to safety deposit boxes, drawers and the like where an unusual degree of security against the possible forcing of the lock is desired. The invention has for its objects the provision of a construction of the type set forth in which the locking bar which is under the control of the locking unit is very securely held against forcing and in which it is impossible to withdraw the locking unit without destruction of the parts surrounding the unit or the unit itself. More specifically, the invention has for its object the provision of an improved construction of the type specified, in which the cylinder of the pin tumbler unit acts as the detent for the locking bar when such bar is in locking position and in which it is necessary to remove the unit bodily before the. locking bar can be moved to release position. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein:

Figure l is a plan view. Fig. 2 is a section on the line IIII of Fig. 1. Fig. 3 is a bottom view on the line IIIIII of Fig. 2 with the bottom plate removed to show the parts in the casing thereabove, and with the locking bar in retracted or release position. Fig. 4 is a view similar to that of Fig. 2, but with the cylinder of the pin tumbler unit withdrawn so that the locking bar is in release position. Fig. 5 is a plan view showing a modification. Fig. 6 is a horizontal section on the line VI-VI of Fig. 5. Fig. 7 is a vertical section on the line VIIVII of Fig. 6. And Fig. 8 is an end view of the lock cylinder with the. cover plate removed.

Referring to the drawings, A is the casing of the lock with the parts 9, I!) and II thereof secured together by four screws I2, and I3 is the locking bar mounted for sliding movement in the casing and having its front end extended through a slot in the end wall of the casing when the bar is in looking position, as indicated in Fig. 2. The rear end of the bar is provided with a pair of guide pins l4, M (Fig. 3) which lie above the guide bars l5, l5, such bars being secured to the top wall of the casing by the four screws IS. The bar is normally pulled to retracted position by a spring l1, and is provided with a perforation I8 of circular cross section to fit the cylinder of the pin tumbler locking unit, later described. The top member I I of the casing is also provided with a perforation l9, similar to the perforation l8, and also adapted to receive the cylinder of the pin and tumbler unit.

The pin and tumbler unit which acts to hold the locking bar in the locked position shown in Fig. 3, comprises the usual cylinder 20, a plug 2| mounted for rotation in the cylinder, pins and tumblers, one set of which is shown at 22 in Fig. 2, and a pair of detents 23, 23 mounted for sliding movement in the cylinder transversely thereof and movable into and out of the cylinder by the rotation of the plug when the key 24 is in position in the plug. The detents are held in place by a cover plate 25 secured to the lower end of the cylinder by a. pair of screws which enter the threaded holes 26 (Fig. 8) in the end of the cylinder. The ends of the detents overlap as indicated in Fig. 2, and are provided with a pair of cam slots 21, 21 (Fig. 8) engaged by a pair of pins 28, 28 secured to a disc 29 concentric with the cylinder 20. The disc 29 has a cam slot 30 which is engaged by a pin 3| on the lower end of the plug 2|. The rotation of the plug causes the rotation of the disc 29 by reason of the pin and cam slot connection 30, 3|, and the rotation of the disc in turn rotates the detents 23, 23 by reason of the pin and cam slot connections 21, 21, 28, 28, above described. This type of connection is required because the plug 2| is oli center with respect to the cylinder. If the plug were concentric with the cylinder, the two pins 28, 28 might be carried directly on the end of the plug in engagement with the cam slots 21, 21, thus dispensing with the disc 29 and the pin and slot connection 30, 3|.

The locking bar carries on its upper side an upright cam plate 32 whose inclined edge is adapted to be engaged by the end of the cylinder 20, so that when the cylinder is pushed down into the casing from the position of Fig. 4 to the position of Fig. 2, the locking bar is moved to the right against the tension of the spring I! to the locking position shown in Fig. 2. The insertion of the lock unit thus performs the function of causing the end of the locking bar to enter its locking socket (not shown). After the parts are so positioned, the rotation of the plug 2| by its key 24, moves the detents 23, 23 to locking position beneath the bar (Fig. 2). To unlock the device, the key is rotated in the reverse direction to move the detents into the cylinder after which the unit is pulled outward to the position of Fig. 4, permitting the spring ll to move the bar to the left to unlocked position. In order to prevent the cylinder from rotating with the plug when the key is turned, its flange 33 is provided with arecess which receives a lug 34 (Fig. 1) projecting inward on the collar 35 which is integral with the plate 9.

It will be apparent that the lock, as shown and described, is of a very secure character. The cylinder 20 is of such strength that only the de struction of. the casing or looking bar will cause the release of such bar, so that it is practically impossible to force the lock. Further the cylinder itself is very securely held against removal by the detents 23, 23' which lie beneath the locking bar and form very positive holding means, since they must be sheared off in order to remove the cylinder by an endwise movement thereof. Because of its security against release, either by force applied to the bar or to the barrel, the structure is especially adapted for safety deposit boxes.

Figs. 5, 6 and 7 show a modification in which the casing 36 is set into a wood mounting 37, such as would be the case in applying the structure to a door or drawer. This construction, while similar in principle with the device of Figs. 1 to 4, departs therefrom in the particulars that (1) no spring is used for moving the locking bar 38, (2) two perforations 39, are employed in the locking bar, instead of only the one perforation, and (3) no cam means are provided corresponding to the part 32 of the Figs. 1 to 4 device. The top walls of the casing 36 and wood mounting 31 are provided with circular perforations ii of the same diameter as the perforations 39 and 40 in the locking bar for receiving the cylinder of the lock unit 42 which is the same as described in connection with Figs. 1 to l. The locking bar is also provided with a pin 42 for reciprocating the locking bar 38 manually, such pin projecting slightly above the upper face of the wood casing (Fig. 6). When the locking bar is in looking position with its end in the socket 43 of the member 44, as shown in Figs. 5 and 6, the insertion of the lock unit through the perforations 4i and 40 secures the locking bar 38 in locked position. When the unit is removed, the locking bar may be 'moved by the pin 42 to the release position shown in Fig. 7. The lock unit may now be inserted through the perforations 4| and 39, thus locking the bar 38 in release position. This arrangement provides a place for storing the lock unit when the lock is in release position and restores the appearance of the face of the wood casing, which would otherwise be left with an unsightly opening. The construction thus provides an advantage as to appearance when in unlocked position over that of Figs. 1 to 4, making it more suitablefor doors and drawers which may be left unlocked for considerable periods. The construction of Figs. 1 to 4 is preferred, however, for use in safedeposit boxes and other locations in which the container guarded is to be kept locked except for short intervals. The pin 42, in addition to acting as a means for moving the bar 38, serves tolock the cylinder of the lock unit against rotation when the plug is being turned by the key, as the pin fits into a recess 45 (Fig. 5) at the periphery of the cylinder when the parts are in assembled position, thus performing the function of the lug 34 of Fig. 1.

What I claim is:

1. In combination in a look, a casing having a slot through one wall for a lock bar and a perforation through another wall at right angles thereto for the cylinder of a pin tumbler lock, a lock bar mounted for sliding movement in the casing and adapted in locking position to project through said slot, said bar being provided with a perforation adapted to align with said perforation in the wall of the casing when the bar is in looking position, means operable through said perforation in the wall of the casing for moving the lock bar to locking position and a pin tumbler unit having a cylinder adapted to fit removably in said perforations in the casing and bar and.

provided at its inner end with a detent movable transversely of the cylinder operable by the rotation of the plug of the lock and adapted when the cylinder is in looking position in the casing to lie inward of said bar.

2. In combination in a lock, a casing having a slot through one wall for a lock bar and a perforation through another wall at right angles thereto for the cylinder of a pin tumbler look, a lock bar mounted for sliding movement in the casing and adapted in locking position to project through said slot, said bar being provided with a perforation adapted to align with said perforation in the wall of the casing when the bar is in lockingposition, a spring normally holding the bar in retracted position, a cam member on the bar, and a pin tumbler lock having a cylinder adapted to fit removably in said perforations in the casing and bar and provided at its inner end with a detent movable transversely of the cylinder operable by the rotation of the plug of the lock and adapted when the cylinder is in locking position in the casing to lie inward of said bar, said cam being positioned so that it is engaged by the end of the cylinder when such cylinder is inserted into the casing and being adapted to move the bar to locking position when the cylinder is so inserted.

3. In combination in a lock, a casing having a slot through one wall for a lock bar and a perforation through another wall at right angles thereto for the cylinder of a pin tumbler lock, a lock bar mounted for sliding movement in the casing and adapted in locking position to project through said slot, said bar being provided with one perforation adapted to align with said perforation in the wall of the casing when the bar is in locking position and with a second perforation adapted to align with the perforation in the wall of the casing when the bar is in retracted position, and a pin tumbler lock having a, cylinder adapted to fit removably in said perforations in the casing and bar and provided at its inner end with a detent movable transversely of the cylinder operable by the rotation of the plug of the lock and adapted when the barrel is in locking position in the casing to lie inward of said bar.

4. In combination in a look, a casing having a slot through one wall for a lock bar and a perforation through another wall at right angles thereto for the cylinder of a pin tumbler lock, a lock bar mounted for sliding movement in the casing and adapted in looking position to project through said slot, said bar being provided with a perforation adapted to align with said perforation in the wall of the casing when the bar is in locking position, a pin tumbler unit having a cylinder adapted to fit removably in said perforations in the casing and bar and provided at its inner end with a pair of detents slidably mounted in the end of the cylinder for movement transversely thereof into and out of the cylinder operable by the rotation of the plug of the lock and adapted when the cylinder is in looking position in the casing to lie inward of said bar, and means attached to the lock bar for moving it into the casing to its unlocked position when the pin tumbler unit is removed from said perforation.

HARRY R. KIRKWOOD.

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