CA1160856A - Bolt mechanisms - Google Patents
Bolt mechanismsInfo
- Publication number
- CA1160856A CA1160856A CA000353205A CA353205A CA1160856A CA 1160856 A CA1160856 A CA 1160856A CA 000353205 A CA000353205 A CA 000353205A CA 353205 A CA353205 A CA 353205A CA 1160856 A CA1160856 A CA 1160856A
- Authority
- CA
- Canada
- Prior art keywords
- crank arm
- slot
- boltwork
- drive
- mechanism according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Lock And Its Accessories (AREA)
Abstract
TITLE OF THE INVENTION
BOLT MECHANISMS
ABSTRACT OF THE DISCLOSURE
A bolt mechanism for the door of a safe has bolts which are thrown by a crank arm turned by a spindle connected to an external handle, the crank arm carrying a pin which runs in a drive slot in a bar connected to the bolt strap. A plate is carried by the bolt of a lock so that when the safe bolts are thrown and the lock operated the plate carries the crank pin clear of the drive slot, the crank arm being slidable transversely on the spindle for this purpose. This operation isolates the connecting bar from the spindle to prevent the application of force to the boltwork through the spindle in the sense tending to withdraw he boltwork.
BOLT MECHANISMS
ABSTRACT OF THE DISCLOSURE
A bolt mechanism for the door of a safe has bolts which are thrown by a crank arm turned by a spindle connected to an external handle, the crank arm carrying a pin which runs in a drive slot in a bar connected to the bolt strap. A plate is carried by the bolt of a lock so that when the safe bolts are thrown and the lock operated the plate carries the crank pin clear of the drive slot, the crank arm being slidable transversely on the spindle for this purpose. This operation isolates the connecting bar from the spindle to prevent the application of force to the boltwork through the spindle in the sense tending to withdraw he boltwork.
Description
The present invention relates to bolt mechanisms, and more particularly is concerned with bolt mechanisms for safes, vaults, strong-rooms and the like security enclosures.
It is common for the bolts on the door of a safe or the like to be thrown into engagement with the body of the safe by means of a handle on the outside of the door, and then to be locked in the thrown condition by a separate key or combination lock. The throwing mechanism typically comprises a cranX attached to a sp-indle turned directly or indirectly by the handle. The crank-pin operates on the bolts via a scotch-yoke ~i.e.
the pin slides in a slot extending at right angles to the required direc-tion of motion~ of a connecting bar attached to the bolt strap. The same mechanism is also used to withdraw the boltwork from its thrown condition, and moreover is liable to be used in an attack on the safe to put force on the boltwork. Specifically, there is the disadvantage that force can be applied through the handle in the sense t:o tend to withdraw the boltwork from its thrown condition against the actiorl of the locking mechanism.
It is an aim of the invention to provide a form of bolt mech-anism that may be used to overcome the above disadvantage, and accordingly in one aspect the invention resides in a bolt mechanism for the door of a security enclosure comprising a manually operable member accessible from without the enclosure;
a crank arm rotatable in either sense by the manually operable member and operatively connectable with a drive slot in a linearly moveable. transmission member operatively associated with the boltwork o the door whereby rotation of the crank arm in either sense by the manually operable member imparts linear motion to said transmission member in a corresponding sense to throw or withdraw the boltwork, a lock Eor selectively locking the boltwork when in its thrown 10 condition; and means for selectively disengaging the coupling of the manually operable member to the boltwork when the boltwork is in its thrown condition, at least in the sense of force transmission from said member to the boltwork such as to withdraw the boltwork, by disengaging said crank arm from 15 said drive slot.
Preferably the disengaging means are operatively associated with said lock for selectively locking the boltwork when in its thrown condition, whereby operation of the lock acts to 20 disengage the coupling oE the manually operable member to the bo].twork as aforesaid. This need not necessaril.y be the case, however, and it is also pose~ible, for example, for the di6engaging means to be embodied as an independent key or combination operated mechanism, separate ~rom any such lock.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 illustrates a bolt mechanism in accordance with the invention installed within a safe door, being shown in the condition which pertains when the safe bolts are withdrawn;
Figure 2 illustrates the mechanism of Figure 1 in the 10 condition which pertains when the safe bolts are thrown and the lock operated;
Figure 3 illustrates a modification to the mechanism oE
Figures 1 and 2, being shown in the condition which pertains 15 when the sa~e bolts are withdrawn; and Fiyure 4 illustrates the mechanism of Figure 3 in -the condition which pertains when the sa~e bolts are thrown and the lock operated.
Referring to Figure 1, a handle (not shown) is mounted externally oE the door 1 and has a spindle 2 that extends through the door to be coupled to a crank arm 3. More particularly the spindle 2 extends into a slot 4 in the arm 3 25 and is there fitted with a bush 5 that has flats 5A which contact the opposite walls 6 of the slot 4. The arm 3 accordingly turns with the spindle 2 under torque applied to the handle, but can slide transversely with re~pect to the rotational a~;is of the spindle 2 The arm 3 carries a crank pin ~ to en~age in a drive slot 8 of a s~otch-yoke coupling to a connecting bar 9. The connecting bar is n~ounted to slide longitudinally and is Coupled to a strap 10 that carries the safe bolts 11 ~only one of which is shown in part).
Turning of the spindle 2 accordingly turns the crank arm 3 and moves the pin 7 up or down the slot 8. This movement oI the pin 7 drives the bar 9 to and fro and thereby throws the bolts 11 or 10 withdraws them in dependence upon the sense in which the external han dl e i s r otat e d .
Referring now to Figure 2, when the bolts 11 have been thrown into engagement with the body of the saie they are locked there in the normal manner by key-ope~ration of a lock 12, the bolt 13 of the lock 15 being thrown to engage in a notch 14 in the bar 9. Such operation in this case, however, also serves to disengage the co~pling of the crank pin 7, and hence also of the external handle, to the boltwork in the bolt-withdrawing sense. To this end a plate 15 is conrlected to the lock bolt 13, and lies between the arm 3 and the connecting bar 9.
20 This plate has an arcuate slot 16 into which the crank pin 7 extends and along which the pin runs during its norlnal operation when throwing the safe bolts 11. When the bolts have been thrown but before the lock 12 has been operated the crank pin is in the position indicated in broken line in Figure 2. When the lock is then operated, 25 however, the plate 15 moves with the lock bolt 13 to carry the pin 7, engaged in slot 16, to the position indicated in full line in Figure 2, the arm 3 sliding on the spindle bush 5 to permit this operation. In this condition the rotary colmection between the spindle 2 and arm 3 is still efective but, as will be appreciated from the Fi gure, the 30 crank pin 7 is now isolated from the flank 8A of the drive slot 8 so force cannot be applied to the connecting bar 9 via the spirldle in the sense to withdraw the safe bolts 11, ~5~
Preferably, provision is also made in the mechanisn~ lor blocking rotational movement Or the crank pin in this disengaged condition, such as by the inclusion of a fixed locking ~loc}; 17 v~hich lies in the path of the pin (but being ol:fset :~rom the arm 3, pl~te 15 5 and bar 9). Also, il the opposing flanl; 8B of the drive slot 8 is extended in comparison with :flank 8A, as shown in the Figure, so that the pin 7 does not become isolated Irom this longer flank, the blocking oI the rotational movement of the pin will provide an additional positive locking action against the withdrawal of the sae 1 0 bolts .
The unlocking operation of the lock 12 withdraws the bolt 13 and plate 15 so that the pin 7, still engaged in the slot 16, is pulled towards the spindle 2 with the arm 3 sliding on the bush 5, to re-establish coupling with the drive slot flank 8A. Turning of the 15 external handle in the appropriate sense will therefore now be effective to withdraw the saie bolts 11.
It will be noted that a longitudinal slot 18 is provided in the plate 15 to clear the bush 5 as the plate moves to and fro with the lock bolt 13, and similarly a longitudinal slot 19 is provided in the connecting 20 bar 9 to clear the spindle 2 during its to and fro movement as the safe bolts are thrown and withdrawn.
A modification to the mechanism is illustrated in Figures 3 and 4. In this there is an arm 3', pin 7', plate 15' and slot 16' equivalent to the components identified by the same unprimed ;!5 reference numerals in Figures 1 and 2. In this case also there is a flat-sided spindle 2l (or an equivalent bush) which engages between the llats 6' of a slot 4' in the arm 3' to drive the latter in rotation when the safe bolts are thrown or withdrawn, but the throw of the lock bolt to which the plate 15' is connected is such that when the 30 plate is moved on operation of the lock the crank pin and arrn are carried down into a position in which the spindle 2' lies in an end 4A' of the slot 4' which is opened out to a diameter not less than the greatest cross-sectional dimension of the spindle. Consequently, in this condition the spindle and the external handle to which it is connected can rotate without restraint, the thus free wheeling handle now being completely isolated from the rest of the bolt-throwing mechanism. Only when the spindle is correctly aligned by the external handle will it be possible to unlock the safe bolts~ raising the plate 15' and crank arm 3' so that the spindle re-engages between the flats 6'.
It is common for the bolts on the door of a safe or the like to be thrown into engagement with the body of the safe by means of a handle on the outside of the door, and then to be locked in the thrown condition by a separate key or combination lock. The throwing mechanism typically comprises a cranX attached to a sp-indle turned directly or indirectly by the handle. The crank-pin operates on the bolts via a scotch-yoke ~i.e.
the pin slides in a slot extending at right angles to the required direc-tion of motion~ of a connecting bar attached to the bolt strap. The same mechanism is also used to withdraw the boltwork from its thrown condition, and moreover is liable to be used in an attack on the safe to put force on the boltwork. Specifically, there is the disadvantage that force can be applied through the handle in the sense t:o tend to withdraw the boltwork from its thrown condition against the actiorl of the locking mechanism.
It is an aim of the invention to provide a form of bolt mech-anism that may be used to overcome the above disadvantage, and accordingly in one aspect the invention resides in a bolt mechanism for the door of a security enclosure comprising a manually operable member accessible from without the enclosure;
a crank arm rotatable in either sense by the manually operable member and operatively connectable with a drive slot in a linearly moveable. transmission member operatively associated with the boltwork o the door whereby rotation of the crank arm in either sense by the manually operable member imparts linear motion to said transmission member in a corresponding sense to throw or withdraw the boltwork, a lock Eor selectively locking the boltwork when in its thrown 10 condition; and means for selectively disengaging the coupling of the manually operable member to the boltwork when the boltwork is in its thrown condition, at least in the sense of force transmission from said member to the boltwork such as to withdraw the boltwork, by disengaging said crank arm from 15 said drive slot.
Preferably the disengaging means are operatively associated with said lock for selectively locking the boltwork when in its thrown condition, whereby operation of the lock acts to 20 disengage the coupling oE the manually operable member to the bo].twork as aforesaid. This need not necessaril.y be the case, however, and it is also pose~ible, for example, for the di6engaging means to be embodied as an independent key or combination operated mechanism, separate ~rom any such lock.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 illustrates a bolt mechanism in accordance with the invention installed within a safe door, being shown in the condition which pertains when the safe bolts are withdrawn;
Figure 2 illustrates the mechanism of Figure 1 in the 10 condition which pertains when the safe bolts are thrown and the lock operated;
Figure 3 illustrates a modification to the mechanism oE
Figures 1 and 2, being shown in the condition which pertains 15 when the sa~e bolts are withdrawn; and Fiyure 4 illustrates the mechanism of Figure 3 in -the condition which pertains when the sa~e bolts are thrown and the lock operated.
Referring to Figure 1, a handle (not shown) is mounted externally oE the door 1 and has a spindle 2 that extends through the door to be coupled to a crank arm 3. More particularly the spindle 2 extends into a slot 4 in the arm 3 25 and is there fitted with a bush 5 that has flats 5A which contact the opposite walls 6 of the slot 4. The arm 3 accordingly turns with the spindle 2 under torque applied to the handle, but can slide transversely with re~pect to the rotational a~;is of the spindle 2 The arm 3 carries a crank pin ~ to en~age in a drive slot 8 of a s~otch-yoke coupling to a connecting bar 9. The connecting bar is n~ounted to slide longitudinally and is Coupled to a strap 10 that carries the safe bolts 11 ~only one of which is shown in part).
Turning of the spindle 2 accordingly turns the crank arm 3 and moves the pin 7 up or down the slot 8. This movement oI the pin 7 drives the bar 9 to and fro and thereby throws the bolts 11 or 10 withdraws them in dependence upon the sense in which the external han dl e i s r otat e d .
Referring now to Figure 2, when the bolts 11 have been thrown into engagement with the body of the saie they are locked there in the normal manner by key-ope~ration of a lock 12, the bolt 13 of the lock 15 being thrown to engage in a notch 14 in the bar 9. Such operation in this case, however, also serves to disengage the co~pling of the crank pin 7, and hence also of the external handle, to the boltwork in the bolt-withdrawing sense. To this end a plate 15 is conrlected to the lock bolt 13, and lies between the arm 3 and the connecting bar 9.
20 This plate has an arcuate slot 16 into which the crank pin 7 extends and along which the pin runs during its norlnal operation when throwing the safe bolts 11. When the bolts have been thrown but before the lock 12 has been operated the crank pin is in the position indicated in broken line in Figure 2. When the lock is then operated, 25 however, the plate 15 moves with the lock bolt 13 to carry the pin 7, engaged in slot 16, to the position indicated in full line in Figure 2, the arm 3 sliding on the spindle bush 5 to permit this operation. In this condition the rotary colmection between the spindle 2 and arm 3 is still efective but, as will be appreciated from the Fi gure, the 30 crank pin 7 is now isolated from the flank 8A of the drive slot 8 so force cannot be applied to the connecting bar 9 via the spirldle in the sense to withdraw the safe bolts 11, ~5~
Preferably, provision is also made in the mechanisn~ lor blocking rotational movement Or the crank pin in this disengaged condition, such as by the inclusion of a fixed locking ~loc}; 17 v~hich lies in the path of the pin (but being ol:fset :~rom the arm 3, pl~te 15 5 and bar 9). Also, il the opposing flanl; 8B of the drive slot 8 is extended in comparison with :flank 8A, as shown in the Figure, so that the pin 7 does not become isolated Irom this longer flank, the blocking oI the rotational movement of the pin will provide an additional positive locking action against the withdrawal of the sae 1 0 bolts .
The unlocking operation of the lock 12 withdraws the bolt 13 and plate 15 so that the pin 7, still engaged in the slot 16, is pulled towards the spindle 2 with the arm 3 sliding on the bush 5, to re-establish coupling with the drive slot flank 8A. Turning of the 15 external handle in the appropriate sense will therefore now be effective to withdraw the saie bolts 11.
It will be noted that a longitudinal slot 18 is provided in the plate 15 to clear the bush 5 as the plate moves to and fro with the lock bolt 13, and similarly a longitudinal slot 19 is provided in the connecting 20 bar 9 to clear the spindle 2 during its to and fro movement as the safe bolts are thrown and withdrawn.
A modification to the mechanism is illustrated in Figures 3 and 4. In this there is an arm 3', pin 7', plate 15' and slot 16' equivalent to the components identified by the same unprimed ;!5 reference numerals in Figures 1 and 2. In this case also there is a flat-sided spindle 2l (or an equivalent bush) which engages between the llats 6' of a slot 4' in the arm 3' to drive the latter in rotation when the safe bolts are thrown or withdrawn, but the throw of the lock bolt to which the plate 15' is connected is such that when the 30 plate is moved on operation of the lock the crank pin and arrn are carried down into a position in which the spindle 2' lies in an end 4A' of the slot 4' which is opened out to a diameter not less than the greatest cross-sectional dimension of the spindle. Consequently, in this condition the spindle and the external handle to which it is connected can rotate without restraint, the thus free wheeling handle now being completely isolated from the rest of the bolt-throwing mechanism. Only when the spindle is correctly aligned by the external handle will it be possible to unlock the safe bolts~ raising the plate 15' and crank arm 3' so that the spindle re-engages between the flats 6'.
Claims (10)
1. A bolt mechanism for the door of a security enclosure comprising a manually operable member accessible from without the enclosure; a crank arm rotatable in either sense by the manually operable member and operatively connectable with a drive slot in a linearly moveable transmission member operatively associated with the boltwork of the door whereby rotation of the crank arm in either sense by the manually operable member imparts linear motion to said transmission member in a corresponding sense to throw or withdraw the boltwork; a lock for selectively locking the boltwork when in its thrown condition; and means for selectively disengaging the coupling of the manually operable member to the boltwork when the boltwork is in its thrown condition, at least in the sense of force transmission from said member to the boltwork such as to withdraw the boltwork, by disengaging said crank arm from said drive slot.
2. A mechanism according to Claim 1 wherein said disengaging means are operatively associated with said lock whereby operation of the lock acts to disengage the crank arm from the drive slot as aforesaid.
3. A mechanism according to Claim 1 wherein the disengagement of the crank arm from the drive slot is effected by a movement of the crank arm in a direction transverse to the rotational axis thereof.
4. A mechanism according to Claim 3 wherein said crank arm is provided with a slot within which is received a flat-sided rotary drive member operatively associated with the manually operable member, thereby to permit both the transmission of rotary motion from the drive member to the crank arm upon manipulation of the manually operable member and motion of the crank arm relative to the drive member in a direction transverse to the rotational axis thereof upon operation of said disengaging means.
5. A mechanism according to Claim 3 wherein the crank arm is arranged to engage with the drive slot through the agency of a crank pin carried by the arm and said disengaging means comprise a linearly moveable disengaging member provided with an arcuate slot into which the crank pin extends and along which the crank pin runs when the crank arm is rotated to throw or withdraw the boltwork but whereby movement of said disengaging member acts to disengage the crank pin from the drive slot as aforesaid.
6. A mechanism according to Claim 1 comprising means for blocking rotational movement of the crank arm when disengaged from the drive slot as aforesaid.
7. A mechanism according to claim 1 wherein said disengaging means are operable to disengage the crank arm from that flank of the drive slot which is effective in the transmission of force from the arm to said transmission member such as to withdraw the boltwork but not from the opposing flank.
8. A mechanism according to claim 1 wherein said disengaging means are further effective to disengage the crank arm from a rotary drive member operatively associated with the manually operable member and arranged normally to transmit rotary motion in either sense from the manually operable member to the crank arm, to the extent of preventing such transmission of rotary motion.
9. A mechanism according to Claim 8 wherein said disengagement of the crank arm from the rotary drive member is effected by a movement of the crank arm in a direction transverse to the rotational axis thereof.
10. A mechanism according to Claim 9 wherein the rotary drive member has a pair of opposed flat sides and is received within a slot in the crank arm; said slot has a first portion with sides complementary to the flat sides of the drive member and an adjoining second portion of a cross section to permit the drive member to rotate freely therein; and said disengaging means are operable to move the crank arm from a position in which the drive member lies within said first portion of its slot to a position in which the drive member lies within said second portion thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000353205A CA1160856A (en) | 1980-06-02 | 1980-06-02 | Bolt mechanisms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000353205A CA1160856A (en) | 1980-06-02 | 1980-06-02 | Bolt mechanisms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160856A true CA1160856A (en) | 1984-01-24 |
Family
ID=4117086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000353205A Expired CA1160856A (en) | 1980-06-02 | 1980-06-02 | Bolt mechanisms |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1160856A (en) |
-
1980
- 1980-06-02 CA CA000353205A patent/CA1160856A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |