CA1198754A - Door latch mechanism - Google Patents
Door latch mechanismInfo
- Publication number
- CA1198754A CA1198754A CA000430973A CA430973A CA1198754A CA 1198754 A CA1198754 A CA 1198754A CA 000430973 A CA000430973 A CA 000430973A CA 430973 A CA430973 A CA 430973A CA 1198754 A CA1198754 A CA 1198754A
- Authority
- CA
- Canada
- Prior art keywords
- actuator
- door
- latch
- latch mechanism
- door latch
- 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
- 238000000034 method Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Lock And Its Accessories (AREA)
Abstract
ABSTRACT
There is disclosed a door latch mechanism having a sliding latch mounted to slide from a retracted position to an extended position in which it is adapted to engage in a keeper slot to hold the door closed. A
pivoted actuator for the latch is adapted to engage a striker during closing of the door to retract the actuator. When the actuator is retracted it retracts the latch. A manual operator for retracting the actuator is operable from the inside or outside of the door. A
locking member prevents retraction of the sliding latch to lock the door.
There is disclosed a door latch mechanism having a sliding latch mounted to slide from a retracted position to an extended position in which it is adapted to engage in a keeper slot to hold the door closed. A
pivoted actuator for the latch is adapted to engage a striker during closing of the door to retract the actuator. When the actuator is retracted it retracts the latch. A manual operator for retracting the actuator is operable from the inside or outside of the door. A
locking member prevents retraction of the sliding latch to lock the door.
Description
3'7~
Title: DOOR LATCH MECHANISM
This invention relates to a latch mechanism and refers more particularly to a door la-tch mechanism having a sliding latch.
SU~RY OF THE INVENTION
The door latch mechanism of this invention comprises a housing adapted to be mounted on a door, and a sliding latch mounted on the housing for sliding movement from a retracted position to an extended position in which it is adapted to engage behind a keeper to hold the door closed. Spring means urges the latch to its extended position. An actuator is pivoted on the housing for pivotal movement from a retracted to an extended position. The actuator has a first arm adapted to engage and retract the latch when the actuator is pivoted to its retracted position, a second arm adapted to cam past the keeper during closing of the door and in the process to pivot the actuatGr to its retracted position, and a third arm.
Manually operated means has a part engageable with the third arm to pivot the actuator to its retracted position.
These and other objects of the invention all become more apparent as the following description proceeds, especially when considered with the accompany-ing drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a top plan view of a door latch mechanism constructed in accordance with my invention.
, ~ , 3~
Fig. 2 is an elevational view o~ the door latch mechanism shown in Fig. 1 with -the cover removed and looking in the direction of the arrow 2 in Fig. 1.
Fiy. 3 is a view looking in the direction of the arrow 3 in Fig. 2, with the cover included.
Fig. 4 is a fragrnentary view looking in the direction of the arrow 4 in Fig. 1.
Fig. 5 is a sectional view taken on the line 5--5 in Fig. 2, with the cover included.
Fig. 6 is a sectional view taken on the line 6---6 in Fig~ 2, with the cover included.
Eig. 7 is a sectional view taken on the line 7--7 in Fig. 5.
Fig. 8 is a sectional view taken on the line 8--8 in Fig. 2, showing the sliding latch extended.
Fig. 9 is similar to Fig. 8, but shows the sliding latch retrac-ted.
DETAILED DESCRIPTION
Referring now more particularly to the draw-ings, the door latch rnechanism comprises a housing 10, a co~er 12, a sliding latch 14, a latch actuator 16, an operator 17 and a locking member 18u The housing 10 has a rectangular enclosure formed of four walls 20, 22, 24 and 26 extending out-wardly from the base 28 and is shown mounted on the inside of a door D by fasteners ~g.
The sliding latch 14 is an elongated, gen-~,t3~.7~j~
erally flat rectangular mem~er adapted to slide from retracted position wi-thin the housing (Fig. 9) to an extended position extending forwardly through a hole 30 in the fron-t wall 20 of the housiny (Figs~ 1, 2 and 8).
The latch 14 has an elongated central slot 31 in the rear end to clear operator 17 when the latch is re-tracted.
A recess 32 is formed in the outer surface at the for-ward end of the slide. A pivot pin 34 extends across this recess, and a roller 36 is moun-ted on the pin for free rotation with its peripheral surface projec~ing through a slot 38 in the inner surface of the slide.
This roller is adapted to have a rolling contact with the wall 40 of a keep slot 42 when the latch is extended.
The sliding latch 14 is spring-pressed to its forwardly extending position of Figs. 1, 2 and 8 by a coil spring 43 compressed between the ho~sing wall 26 and the rear end of the latch.
The housing has a pair of la-terally spaced posts 44 extending outwardly from the side walls 22 and 24 of the housing at its forward end, and a pivot pin 46 extends across the space between the outer ends of the posts. The latch actuator 16 is pivoted on the pin 46.
The latch actuator 16 has an arm 48 provided with a cam surface 50 which is adapted to engage the s-triker 52 adjacent to the keeper slot to retract the actuator from the FigO 8 to the Fig. 9 position during closing of the door. The actuator has a second arm 54 ~^`' (~
engageable with the rear wall 56 of the recess 32 in the latch to retract the latch from the Fig. 8 to the Fig. 9 position when the actuator is retracted.
The actuator 16 is located outwardly of the la-tch. The arm 54 is at the side of the actuator ad-jacent to roller 36 and the front wall of arm 54 is cut back or recessed where indicated at 58 to clear the roller. The cam surface 50 extends across the ~ull width of the actuator 16 except where the recess 58 cuts through.
The operator 17 is pivoted on a pin 60 which is parallel to pin 46 and located inwardly and rearwardly thereof. Pin 60 is mounted in the walls 22 and 24 o~
the housingO The operator has an arm 62 extending forwardly ~rom pivot pin 60. Arm 62 has a finger 64 that engages an arm 66 on the actuator 16, which arm 66 is at the opposite side o~ the actua-tor from arm 54.
When the operator 17 is rotated counter-clockwise in Fig. 8, finger 64 acting on actuator arm 66 causes the actuator to turn clockwise -to the Fig. 9 position, retractlng the sliding latch 14. The operator has a con--venient handle portion 70 for rotating it.
The latch 14 can be locked in its forwardly extending position by a locking member 18 having a circular disc portion 73 disposed in a recess 74 in the base 28 of the housing. The disc portion 73 has a hub 76 rotatably mounted in a hole in the base~ permitting the locking member -to be turned back and ~orth on the hub. The disc portion has a lever 78 projecting laterally from the housing -through an opening 80 in the side wall 22 thereof, and a fo~wardly projecting part 82.
When the locking member 18 is turned to -the dotted line position of Fig. 7, the end of its part 82 is disposed behind an abutment ~4 on the extended sliding latch, preventing the sliding latch from retracting. The door may be locked in closed position in this manner. When -the locking member is turned to the solid line position of Fig. 7, its part 82 clears the abutment 84, per-mitting the sliding latch to be retracted. The locking member 18 is turned from one position to the other manually by means of the lever 78.
~n addition to being operated by the handle 70 from the inside of the door, the operator 17 may also be operated by a push rod 86 from the outside of the door.
The push rod extends through openings in the disc and hub portions 73 and 76 of the locking member 18, and its end engages an enlargement 88 on the arm 62 of the operator. Usually the push rod will have a button or the like on its opposite end outside the door ~or push-ing the rod from its Fig. 8 -to its Fig. 9 position, causi~g the operatox 17 to turn counter-clockwise to retract the sliding latch.
The cover 12 is an open shell-like member having sides g2 and 94 extending over the housing walls 22 and 24 and a rear wall 100 e~tending over the housing rear wall 26. The ~ront of the cover is open to expose the front wall 20 of the housing. The rear ~`
wall 100 of the cover has a slot 102 so as not to inter-fere with the operation of the operator 17. End wall 26 of ~he housing is similarly slotted. The cover has laterally outwar~ly extending flanges 104 and 106 which overlie the laterally extending flanges 108 and 110 of the housing, and the fasteners 29 pass through these flanges to rnount the latch mechanism on the door, ~he cover side wall 96 has a slot 120 through which locking lever 78 passes and the cover flange 104 has a slot 122 to clear lever 78 during assembly of the cover with the housing.
The locking member 18 is releasably hel~ in either one of the two positions shown in Fig. 7 against accidental misplacement by a ball 112 pressed ayainst lever 78 by a coil spring 114 located in a tubular portion 116 of the cover side wall 92, As will be understood from the foregoing des-cription, the sliding latch 14 may be retracted either by means of the operator 17 or by engagement of the actuator 16 with striker 52 during closing movement of the door. There is clearance 130 between the arms 48 and 66 of the actuator 16 to permit the actuator to be retracted by the striker 52 without interference with the finger 64 of operator 17.
In use, the latch mechanism is mounted on the inside of the door as shown in the drawings. When the door is mo~ed towards closed position~ and assuming the locking member 1~ is in the unlocked solid line position of Fig. 7, the cam surface 50 of actuator 16 will engage striker 52 to retract the actuator from the Fig. 8 to the Fig. 9 position. Retraction o~ the actuator 16 retrac-ts the sliding latch 14. The sliding latch as well as the actuator 16 will snap out to extended position by the pressure of spring 43 in the fully closed position of the door. The door will be held closed by the engagement of the sliding latch in the keeper slot. During movement of the sliding latch into the keeper slot, the roller 36 has an anti~friction rolling engagement with the surface 40.
The door may be opened by retracting the actuator 16 and sliding la-tch 14 to the Fig. 9 position.
This may be accomplished from the inside of the door by means of operator handle 17, or from the outside of the door by means ofpush rod 86.
To lock 'he door, the locking member 18 is moved by its lever 78 to the dotted line position in Fig. 7 to block retraction of the sliding latch.
Title: DOOR LATCH MECHANISM
This invention relates to a latch mechanism and refers more particularly to a door la-tch mechanism having a sliding latch.
SU~RY OF THE INVENTION
The door latch mechanism of this invention comprises a housing adapted to be mounted on a door, and a sliding latch mounted on the housing for sliding movement from a retracted position to an extended position in which it is adapted to engage behind a keeper to hold the door closed. Spring means urges the latch to its extended position. An actuator is pivoted on the housing for pivotal movement from a retracted to an extended position. The actuator has a first arm adapted to engage and retract the latch when the actuator is pivoted to its retracted position, a second arm adapted to cam past the keeper during closing of the door and in the process to pivot the actuatGr to its retracted position, and a third arm.
Manually operated means has a part engageable with the third arm to pivot the actuator to its retracted position.
These and other objects of the invention all become more apparent as the following description proceeds, especially when considered with the accompany-ing drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a top plan view of a door latch mechanism constructed in accordance with my invention.
, ~ , 3~
Fig. 2 is an elevational view o~ the door latch mechanism shown in Fig. 1 with -the cover removed and looking in the direction of the arrow 2 in Fig. 1.
Fiy. 3 is a view looking in the direction of the arrow 3 in Fig. 2, with the cover included.
Fig. 4 is a fragrnentary view looking in the direction of the arrow 4 in Fig. 1.
Fig. 5 is a sectional view taken on the line 5--5 in Fig. 2, with the cover included.
Fig. 6 is a sectional view taken on the line 6---6 in Fig~ 2, with the cover included.
Eig. 7 is a sectional view taken on the line 7--7 in Fig. 5.
Fig. 8 is a sectional view taken on the line 8--8 in Fig. 2, showing the sliding latch extended.
Fig. 9 is similar to Fig. 8, but shows the sliding latch retrac-ted.
DETAILED DESCRIPTION
Referring now more particularly to the draw-ings, the door latch rnechanism comprises a housing 10, a co~er 12, a sliding latch 14, a latch actuator 16, an operator 17 and a locking member 18u The housing 10 has a rectangular enclosure formed of four walls 20, 22, 24 and 26 extending out-wardly from the base 28 and is shown mounted on the inside of a door D by fasteners ~g.
The sliding latch 14 is an elongated, gen-~,t3~.7~j~
erally flat rectangular mem~er adapted to slide from retracted position wi-thin the housing (Fig. 9) to an extended position extending forwardly through a hole 30 in the fron-t wall 20 of the housiny (Figs~ 1, 2 and 8).
The latch 14 has an elongated central slot 31 in the rear end to clear operator 17 when the latch is re-tracted.
A recess 32 is formed in the outer surface at the for-ward end of the slide. A pivot pin 34 extends across this recess, and a roller 36 is moun-ted on the pin for free rotation with its peripheral surface projec~ing through a slot 38 in the inner surface of the slide.
This roller is adapted to have a rolling contact with the wall 40 of a keep slot 42 when the latch is extended.
The sliding latch 14 is spring-pressed to its forwardly extending position of Figs. 1, 2 and 8 by a coil spring 43 compressed between the ho~sing wall 26 and the rear end of the latch.
The housing has a pair of la-terally spaced posts 44 extending outwardly from the side walls 22 and 24 of the housing at its forward end, and a pivot pin 46 extends across the space between the outer ends of the posts. The latch actuator 16 is pivoted on the pin 46.
The latch actuator 16 has an arm 48 provided with a cam surface 50 which is adapted to engage the s-triker 52 adjacent to the keeper slot to retract the actuator from the FigO 8 to the Fig. 9 position during closing of the door. The actuator has a second arm 54 ~^`' (~
engageable with the rear wall 56 of the recess 32 in the latch to retract the latch from the Fig. 8 to the Fig. 9 position when the actuator is retracted.
The actuator 16 is located outwardly of the la-tch. The arm 54 is at the side of the actuator ad-jacent to roller 36 and the front wall of arm 54 is cut back or recessed where indicated at 58 to clear the roller. The cam surface 50 extends across the ~ull width of the actuator 16 except where the recess 58 cuts through.
The operator 17 is pivoted on a pin 60 which is parallel to pin 46 and located inwardly and rearwardly thereof. Pin 60 is mounted in the walls 22 and 24 o~
the housingO The operator has an arm 62 extending forwardly ~rom pivot pin 60. Arm 62 has a finger 64 that engages an arm 66 on the actuator 16, which arm 66 is at the opposite side o~ the actua-tor from arm 54.
When the operator 17 is rotated counter-clockwise in Fig. 8, finger 64 acting on actuator arm 66 causes the actuator to turn clockwise -to the Fig. 9 position, retractlng the sliding latch 14. The operator has a con--venient handle portion 70 for rotating it.
The latch 14 can be locked in its forwardly extending position by a locking member 18 having a circular disc portion 73 disposed in a recess 74 in the base 28 of the housing. The disc portion 73 has a hub 76 rotatably mounted in a hole in the base~ permitting the locking member -to be turned back and ~orth on the hub. The disc portion has a lever 78 projecting laterally from the housing -through an opening 80 in the side wall 22 thereof, and a fo~wardly projecting part 82.
When the locking member 18 is turned to -the dotted line position of Fig. 7, the end of its part 82 is disposed behind an abutment ~4 on the extended sliding latch, preventing the sliding latch from retracting. The door may be locked in closed position in this manner. When -the locking member is turned to the solid line position of Fig. 7, its part 82 clears the abutment 84, per-mitting the sliding latch to be retracted. The locking member 18 is turned from one position to the other manually by means of the lever 78.
~n addition to being operated by the handle 70 from the inside of the door, the operator 17 may also be operated by a push rod 86 from the outside of the door.
The push rod extends through openings in the disc and hub portions 73 and 76 of the locking member 18, and its end engages an enlargement 88 on the arm 62 of the operator. Usually the push rod will have a button or the like on its opposite end outside the door ~or push-ing the rod from its Fig. 8 -to its Fig. 9 position, causi~g the operatox 17 to turn counter-clockwise to retract the sliding latch.
The cover 12 is an open shell-like member having sides g2 and 94 extending over the housing walls 22 and 24 and a rear wall 100 e~tending over the housing rear wall 26. The ~ront of the cover is open to expose the front wall 20 of the housing. The rear ~`
wall 100 of the cover has a slot 102 so as not to inter-fere with the operation of the operator 17. End wall 26 of ~he housing is similarly slotted. The cover has laterally outwar~ly extending flanges 104 and 106 which overlie the laterally extending flanges 108 and 110 of the housing, and the fasteners 29 pass through these flanges to rnount the latch mechanism on the door, ~he cover side wall 96 has a slot 120 through which locking lever 78 passes and the cover flange 104 has a slot 122 to clear lever 78 during assembly of the cover with the housing.
The locking member 18 is releasably hel~ in either one of the two positions shown in Fig. 7 against accidental misplacement by a ball 112 pressed ayainst lever 78 by a coil spring 114 located in a tubular portion 116 of the cover side wall 92, As will be understood from the foregoing des-cription, the sliding latch 14 may be retracted either by means of the operator 17 or by engagement of the actuator 16 with striker 52 during closing movement of the door. There is clearance 130 between the arms 48 and 66 of the actuator 16 to permit the actuator to be retracted by the striker 52 without interference with the finger 64 of operator 17.
In use, the latch mechanism is mounted on the inside of the door as shown in the drawings. When the door is mo~ed towards closed position~ and assuming the locking member 1~ is in the unlocked solid line position of Fig. 7, the cam surface 50 of actuator 16 will engage striker 52 to retract the actuator from the Fig. 8 to the Fig. 9 position. Retraction o~ the actuator 16 retrac-ts the sliding latch 14. The sliding latch as well as the actuator 16 will snap out to extended position by the pressure of spring 43 in the fully closed position of the door. The door will be held closed by the engagement of the sliding latch in the keeper slot. During movement of the sliding latch into the keeper slot, the roller 36 has an anti~friction rolling engagement with the surface 40.
The door may be opened by retracting the actuator 16 and sliding la-tch 14 to the Fig. 9 position.
This may be accomplished from the inside of the door by means of operator handle 17, or from the outside of the door by means ofpush rod 86.
To lock 'he door, the locking member 18 is moved by its lever 78 to the dotted line position in Fig. 7 to block retraction of the sliding latch.
Claims (9)
1. A door latch mechanism comprising a housing adapted to be mounted on a door, a sliding latch mounted on said housing for sliding movement from a retracted position to an extended position in which it is adapted to engage behind a keeper to hold the door closed, spring means urging said latch to its extended position, an actuator pivoted on said housing for pivotal movement from a retracted to an extended position, said actuator having a first arm adapted to engage and retract said latch when said actuator is pivoted to its retracted position, said actuator having a second arm adapted to cam past said keeper during closing of the door and in the process to pivot said actuator to its retracted position, said actuator having a third arm, and manually operated means having a part engageable with said third arm to pivot said actuator to its retracted position.
2. A door latch mechanism as defined in Claim 1, wherein said latch has anti-friction means engageable with said keeper during movement of said latch to its extended position.
3. A door latch mechanism as defined in Claim 2, wherein said anti-friction means comprises a roller.
4. A door latch mechanism as defined in Claim 1, wherein said manually operated means comprises an operator pivoted on said housing.
5. A door latch mechanism as defined in Claim 4, including means for pivoting said operator in a direction to retract said actuator comprising a push rod engageable with a portion of said operator spaced from its pivot.
6. A door latch mechanism as defined in Claim 5, including locking means selectively operable to prevent the retraction of said latch.
7. A door latch mechanism as defined in Claim 6, wherein said locking means comprises a member move-able between operative and inoperative positions and having a part disposed in the operative position of said member to block the retraction of said latch and disposed in the inoperative position of said member to unblock retraction of said latch.
8. A door latch mechanism as defined in Claim 7, including detent means for releasably detaining said member in its operative and inoperative positions.
9. A door latch mechanism as defined in Claim 8, wherein said detent means comprises a spring pressed ball.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45749783A | 1983-01-12 | 1983-01-12 | |
| US457,497 | 1983-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1198754A true CA1198754A (en) | 1985-12-31 |
Family
ID=23816980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000430973A Expired CA1198754A (en) | 1983-01-12 | 1983-06-22 | Door latch mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1198754A (en) |
-
1983
- 1983-06-22 CA CA000430973A patent/CA1198754A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |