US2292784A - Pivoted bolt lock - Google Patents

Description

Aug. 11, 1942. w. E. HAMILTON 9 I PIVOTED BbLT rjocx Filed Oct. 18, v 1940 Patented Aug. 11, 1942 PIVOTED BOLT LOCK William E. Hamilton, Evanston, IlL, assignor to Dudley Lock Corporation, Chicago, 111., a corporation of Illinois Application October 18, 1940, Serial No. 361,693 4 Claims. (01. 70-314) This invention relates to a lock of the type which is operable either by a permutation mechanism or by a key.

One object of the invention is to provide a relatively simplified construction for the control of a bolt of the pivoted type.

Another object is to provide flexible means operated automatically by the bolt for shifting at least one of the permutation tumblers out of registered position after the tumblers have been set to release the bolt, and the bolt has been moved toward unlocking position.

A further object is to provide a sturdy and reliable construction having a minimum of operating parts which shall be economical to manufacture and which shall be reliable in operation.

It is also an object of the invention to provide extremely simple means for releasing the bolt through the agency of a key and independently of the permutation mechanism.

Other objects and advantages will appear as the description proceeds. The invention consists of certain features and elements of construction in combination, as herein shown and described and as indicated by the claims.

In the drawing:

Figure 1 is a front elevation of a lock embodying this invention, including a fragment of a door or other closure to which it is applied.

Figure 2 is a front elevation of the interior mechanism controlling the bolt, the cover of the enclosing case being broken away to reveal details of construction.

Figure 3 is a View similar to Figure 2 but with the entire cover plate removed, and with certain parts of the mechanism omitted, the permutation mechanism being shown adjusted in position to release the bolt.

Figure 4 is a view similar to Figure 3 but with all except one tumbler omitted and showing the bolt acting to turn the tumbler out of adjusted position in its unlocking movement.

Figure 5 is a front elevation looking into the case with the permutation mechanism and its supporting partition plate removed to reveal the key-actuated cam which operates the lock.

Figure 6 is a perspective view of the latch member.

Figure 7 is a detail section taken as indicated at line 1-7 on Figure 2.

A look of the type to which this invention relates is frequently used on closures such as cabinet or locker doors, and it may be understood that Figure 1 shows at A a fragment of such a door. These structures are commonly fitted with vertically movable locking bars, one of which is indicated at B, and which may be understood as having a notch or abutment shoulder at C which engages the under surface of the bolt I. When the bolt is locked it prevents upward movement of the bar B, which would be necessary to release it, or parts connected to it, from keepers, not shown, but when the bolt l is unlocked the bar B is manually shifted by means of a suitable handle, and thus permits the door to be swung open. In devices of this type there is a detent device serving to hold the bar B in un locking position and to automatically release it when the door is closed. An example of such a structure is shown in Patent No. 1,387,643, to Erickson et a1.

Figure 1 shows the case 2 for the lock mechanism in dotted outline as applied to the rear face of the door A, and shows in full lines an escutcheon plate 3 secured to the outer or front face of the door with a rotatable dial 4 and its knob 5 journaled for rotation in the escutcheon plate 3. At the center of the knob 5 there is presented the key slot 6 for operating a lock of the pin tumbler type which is housed in the knob and which may be constructed substantially as shown in my co-pending application Serial No. 356,489, filed September 12, 1940, which has become Patent No. 2,244,152, dated June 3, 1941. For present purposes it is sufiicient to state that the knob 5 isinterlocked with the permutation mechanism by means of lugs 5 (Fig. 2) intermembering with the arcuate notches in the hub portion 1 of a driving disk 1, and that the key-operated mechanism includes a centrally disposed spindle projecting from the rear of the knob assembly for interconnection with the flattened portion 8 of the shaft 8, disposed coaxially with respect to the disk 1. In fact, the disk 1 is journaled on the outside of a hollow post 9, upstanding rigidly from the partition plate l0 within the casing 2, and the shaft 8 is journaled within this hollow post.

The bolt I is fulcrumed on a pivot post H and provided with a spring I 2 which holds the bolt yieldingly at locking position. It may be understood that the portion of the bolt engaging the pivot H is bifurcated to provide space accommodating the coiled portion ofthe spring l2. One end of the spring bears against a wall of the casing 2, while the other end l2 lies in a notch l formed in the bolt adjacent its bifurcated end. Above its locking nose, which normally extends through a slot 2 in the casing, the bolt includes a curved portion 13 which terfrequently member Hi to swing -2 minates in a shoulder 14, and said shoulder normally engages a stop [5 formed as a cross-bar in a latch member l6 shown as pivotally mounted on the screw l1 which may be one of those serving to hold the case and its cover 2 together. A fragment of this cover plate 2 is shown at the opposite corner of the casing 2 in Figure 2. The latch member 16 is provided with a spring l8 which holds it yieldingly in the position shown in Figure 2, with the stop portion 15 blocking movement of the bolt by engaging its shoulder l4.

Th permutation disk tumblers are mounted for rotation about the hollow post'9, being spaced from each other by means of washers I9, and having interconnecting lugs 23 by which motion is communicated from one tumbler to the next when they are adjusted in accordance with the combination of the lock. The uppermost tumbler of the series is shown in Figure 3 at 2!,

having'a pair of upstanding lugs 22- to engage I in any diametrically'opposite pair of holes 1* in the driving disk "I. -As"already mentioned the 'disk'is interlocked'withthe knob -5 for rotation thereby so that the tumbler-disks may be rotatively adjusted as desired. Ordinarily, there are three disks, and the-two'upperdisks are formed with notches like that seen-at 23 in Figure 3, whilethe last or bottom disk 24 has a notch 25, as'seen in Figure l. A pawl 25 is carried on a pivot '21 with one arm 28 extending adjacent the tumbler disks, and with the upturned end portion 29 of the arm normally bearing against the circular peripheries of said disks. But when the disk notches are adjusted in alignment at the position shown in Figure 3 this end portion '29 of the armZB enters 'the'notches'under the force of a spring 36, and the other arm 3| of the pawl28 engages an extension 32 of the latch the latch from its locking position shown in Figure 2 to its release position shown in Figure 3, so that the bolt I may be swungrupwardly about its pivot Hby'actuation of'the bar 13 or any other-suitable mechanism pro- 7 vided for the purpose.

In its initial movement toward unlocking position the bolt shifts its" curved portion l3 past and under the stop portion I5 of the latch'member, thus holding the latch member in open position in opposition to the pressure of its spring I8. As the opening movementof the'bOlt progre'sses' aspring arm 33, extending from the inner'fa'ce' of'the bolt, engages an'abutment shoulder 34 formed in theperiphery of the disk tumbler 24, so that the swinging'movement of the bolt operates to rotate the tumbl-eraway from its former position inwhich its notch 25 was 'aligned'with' the notches of the other tumblers. This rotation of the tumbler 24' causes the'side 25 of the notch 25 to bear forcibly against the upstanding end portion 29 of the pawl 28, and to act as a cam to force said portion of the pawl outv of the tumbler notches in the manner indicated in Figure 4, so that when the bolt 1 arrives at full open position, as shown'in dotted lines'in Figure 4, the tumbler 24 will have been rotated by a substantial amount, carrying its notch 25 entirely out of registration with the notches of the other tumblers and bringing a circular'portion 24 of its periphery into position to engage the edge of the part 29 and prevent its return to release position. Thus the other arm 3| of the pawl 26 is swung away from the extension 32 of the latchmember I6 so that as soon as the an opening Ill :lug'43 carried by 26 and positionedin'the plane of-the cam plate fulcrum pivot I i.

'inets or lockers locking position the latch [6, under pressure of its spring l8, will be swung back to locking position with the stop portion 15 engaging the shoulder M of the bolt, substantially as seen in Figure 2.

The arm 33 is preferably made of a strip of fiat spring stock, such as clock spring material, and is firmly rooted in the body of the bolt I, being retained by a pin 35. As seen in Figures 2 and 3, it is formed with an initial curvature, and, being flexible, it is adapted to be bent further if the movement of the bolt toward its unlocking position should tend to rotate the tumbler 24 fas ter than the part 29 can be cammed outof the notch]?! by this movement; in other words, the flexibility of the arm 33 compensates for any slight discrepancy in these related movements, and insures easy action of the parts without permitting them to bind, as they might do if there were no yielding element included.

For --actuating the bolt 1 independently of-the permutation'disksthe shaft or spindle 8 carries fixed near its lower end a cam plate 40, this platebeing mounted on the shaft 8 between the back wall 2 and the' partition plate 10. The partition plate ID is formed with spacing lugs, shown in dotted-outlineat 10 in Figure 4, providing comfortable accommodation for movement of the plate 40, and the partition'is conveniently 'held'in this position by means of coiled springs ll carried on the securing screwsAZ which-extend through the cover plate 2* and engage threaded holes in the back wall "2. Figure 5 shows a fragment of the partition plate 10 with cut therein'to accommodate a the extension 32 of the'latch 48 for contact with its curved edge M. Thus, when the proper key 'isinserted in the *key slot 6, so as to turn the-shaft;8 from the position shown in dottedioutline in Figure 5 to the position shown in-full lines, the'cam 40 is likewise swung from its dotted line position to full line position so as to rock-the-latch member l6 to release position, swinging its stop 15 out *of engagement with the shoulder M of the bolt and permitting the bolt to be swungabout its own Thus, by means'of the key, it is possible 'tooperate the lock independently of the tumbler disks and without any knowledge of the-combination at which they must be adjusted to release the bolt. This is frequently useful in schools or other institutions where it 'is'desirable that some supervising ofiicer, such as the principal, shall have access to all the cabby means of a master key,-and without having to consult any record of the various combinations of the individual locks by which they are ordinarily operated by the individualusers of the lockers.

While there is shown and described herein certain specific s'ti ucture embodying the invention,

it will-be manifest to those skilled in the'art that various'mo'dificatio'ns and rearrangements of the parts may be made without departing from the spirit and scope of the invention, and that the same is not'limited'to the particular form herein shown and described, except in so far as indicated by the appended claims.

I claim as my invention:

-1. In apermutation lock; a'plurality of notched disk tumblers 'co-axially mounted, abolt pivoted to'swing about'an axis adjacent'the tumblers, a pivoted; latch normally'h'olding the bolt in' lookbolt l is returned to its normal 7 ing position, apivoted'pawl'formed'toenter the notches of the tumblers when they are aligned in release position, said pawl having an arm engageable with the latch to release said latch when said pawl enters the notches, one of the tumblers having an abutment shoulder, and a yielding member carried by the bolt in position to engage said abutment as the bolt moves to unlocking position and serving to rotate the tumbler out of aligned position.

2. In a permutation look, a plurality of notched disk tumblers co-axially mounted, a bolt pivoted to swing about an axis adjacent the tumblers, a pivoted latch normally holding the bolt in locking position, a spring-pressed pawl formed to enter the notches of the tumblers when they are aligned in release position, said pawl having an arm engageable with the latch to release said latch when said pawl enters the notches, and a yielding member operable by the bolt in its movement to unlocking position and including means engageable with a tumbler while its notch is engaged with said pawl whereby the yielding member is stressed by further movement of the .bolt for rotating the tumbler out of aligned position.

3. In a permutation look, a plurality of notched disk tumblers co-axially mounted, a bolt pivoted to swing about an axis adjacent the tumblers, a pivoted latch normally holding the bolt in looking position, a pivoted pawl formed to enter the notches of the tumblers when they are aligned in release position, said pawl having an arm engageable with the latch to release said latch when 3 said pawl enters the notches, one of the tumblers having an abutment shoulder, and a curved spring am having one end secured rigidly to said bolt with its free end positioned to engage the abutment shoulder during movement of the bolt for rotating the tumbler out of aligned position.

4. In a permutation lock, a plurality of notched disk tumblers co-axially mounted, a bolt pivoted to swing about an axis adjacent the tumblers, a pivoted latch normally holding the bolt in locking position, a pivoted pawl formed to enter the notches of the tumblers when they are aligned in release position, said pawl having an arm engageable with the latch to release said latch when said pawl enters the notches, one of the tumblers having an additional notch in its curved arm of fiat spring stock having one end rigidly secured to the bolt with the other end projecting toward said tumbler notch in position to engage therein as the bolt moves to unlocking position, the notch of said tumbler which is entered by the pawl being formed with one edge curved to act as a cam operable to force the pawl out of the aligned tumbler notches when said tumbler is rotated, and the movement of the bolt being transmitted yieldingly to the tumbler for such rotation by the curved spring arm whereby alignment of the disk notches is disturbed in the unlocking movement of the bolt.

WILLIAM E. HAMILTON.

periphery and a

Images