Patent US3750433A successfully refreshed from Google Patents.
US3750433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mortise lock retract mechanism
Assignee: FALCON LOCK COMPANY Inc
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Filing: 1972-02-07
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Granted: 1973-08-07
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Expires: 1992-02-07
Abstract
Abstract A thin casing adapted to fit in a recess between opposite faces of a door has a front plate mounted flush with the door edge through which extends a reciprocating latch bolt for engagement within an opening of a strike plate mounted upon the adjacent door frame. The latch bolt is spring urged into a normally extended position and is retracted by rotation of either an inside or an outside knob. Rotation of the knobs in either a clockwise or counterclockwise direction is transferred rotating one or the other of a pair of hubs mounted within the casing. Roll backs on the hubs engage a lever, one end of which is coupled to the latch bolt and the other end of which is pivotally mounted on the wall of the case. In one form of the device a lock is provided for blocking rotation of the outside knob, while the inside knob is free to withdraw the latch bolt. Openings in the casing on opposite sides of the hubs accomodate threaded sleeves and screws for fastening the knobs in place.
Inventors
- 👤 V Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:51
CPC Classifications
E; E05; E05B; E05B63/00; E05B63/16; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0971; Y10T292/85; Y10T292/858; Y10T292/88; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5385; Y10T70/5389; Y10T70/5394; Y10T70/5465; Y10T70/5478
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
181 words
In a mortise type lock having a case with a reciprocating latch bolt member mounted therein and a rotatably mounted hand hold assembly having a spindle non-rotatably attached thereto, the comination of a latch bolt retracting mechanism comprising a rollbacK element non-rotatably mounted on the spindle, said roll back element having two arcuate rollback surfaces facing each other and extending in a generally radially outward direction relative to the center of rotation of the spindle, a retract arm pivotally mounted in the case and in retracting engagement with said latch bolt member, cam faces on said retract arm angularly disposed relative to each other and at different distances from said pivotal mounting for engagement with the respective rollback surfaces, one of said cam faces being at one angle relative to a radial line from the pivotal axis to the point of intersection of said cam faces and the other cam face being at another angle relative to said radial line, whereby torque forces and rotational input of said hand hold in opposite directions of rotation of the spindle are about equal.
Claim 2
Dependent Claim
181 words
In a mortise type lock having a case with a reciprocating latch bolt member mounted therein and a rotatably mounted hand hold assembly having a spindle non-rotatably attached thereto, the comination of a latch bolt retracting mechanism comprising a rollbacK element non-rotatably mounted on the spindle, said roll back element having two arcuate rollback surfaces facing each other and extending in a generally radially outward direction relative to the center of rotation of the spindle, a retract arm pivotally mounted in the case and in retracting engagement with said latch bolt member, cam faces on said retract arm angularly disposed relative to each other and at different distances from said pivotal mounting for engagement with the respective rollback surfaces, one of said cam faces being at one angle relative to a radial line from the pivotal axis to the point of intersection of said cam faces and the other cam face being at another angle relative to said radial line, whereby torque forces and rotational input of said hand hold in opposite directions of rotation of the spindle are about equal.
Claim 3
Dependent Claim
39 words
A mortise type lock as in claim 1 wherein said cam faces are offset relative to a radial line from the axis of pivotal mounting and the point of engagement of said retract arm with the latch bolt member.
Claim 4
Dependent Claim
46 words
A mortise type lock as in claim 1 wherein there is a pair of sleeve-like connecting means extending from the hand hold assembly through the case, said connecting means being spaced diametrically on opposite sides of said spindle and at locations clear of said rollback element.
Claim 5
Dependent Claim
42 words
A mortise type lock as in claim 1 wherein there are two hand holds on respective opposite sides of the case and a rollback non-rotatably attached to each hand hold, both of said rollbacks being in engagement with the same retract arm.
Claim 6
Dependent Claim
34 words
A mortise type lock as in claim 4 wherein one of said rollbacks has a radially inwardly extending locking notch and a reciprocatable locking slide adapted to engage said locking notch in locking position.
Claim 7
Dependent Claim
29 words
A mortise type lock as in claim 5 wherein there is a stop works button on said locking slide extending outward relative to an end edge of said case.
Claim 8
Dependent Claim
54 words
A mortise type lock as in claim 5 wherein there are two interconnected stop works buttons, one of said buttons being on the locking slide and the other comprising a slide with button attached, said locking slide being adapted to engage said locking notch and the other of said buttons being an unlocking button.
Claim 9
Dependent Claim
59 words
A mortise type lock as in claim 5 wherein there is a lever pivotally mounted in the case, one end of said lever being in engagement with the locking slide and a key actuable lever pivotally mounted on the case and in engagement with another end of said first lever whereby to operate said locking slide by auxiliary action.
Claim 10
Dependent Claim
59 words
A mortise type lock as in claim 1 wherein there is a second retract arm pivotally mounted on said case, one end of said second retract arm being in engagement with the latch bolt and another end of said second retract arm having a key actuatable tab operable independently of said first retract arm to withdraw said latch bolt.
Claim 11
Dependent Claim
57 words
A mortise type lock as in claim 3 wherein the pivotal mounting of said retract arm is spaced laterally from a diametrical line interconnecting said connecting means and at a distance from the axis of rotation of said spindle greater than the distance from said axis of rotation of the spindle and either of said connecting means.
Claim 12
Dependent Claim
47 words
A mortise type lock as in claim 1 wherein there is a pair of shoulders on the side of said rollback opposite from said rollback surfaces and a stop on the case adapted to engage said shoulders in the alternative whereby to limit rotation of the rollback.
Claim 13
Dependent Claim
48 words
A mortise type lock as in claim 4 wherein there is a pair of shoulders in the side of each rollback opposite from the rollback surfaces and a stop in the case adapted to engage said shoulders in the alternative whereby to limit rotation of the respective rollback.
Claim 14
Dependent Claim
41 words
A mortise type lock as in claim 8 wherein said key actuable lever is detented in two selected positions, said detent means being adjacent to and acting directly upon said key actuable lever, said two positions beiNg locked and unlocked conditions.
Claim 15
Dependent Claim
61 words
A mortise type lock as in claim 5 wherein said rollbacks each contain a pair of shoulders in the side of each rollback opposite from the rollback surfaces and said locking slide acts as a stop to engage said shoulders in the alternative whereby to limit rotation of respective said rollbacks regardless of locked or unlocked position of said locking slide.
Claim 16
Dependent Claim
30 words
A mortise type lock as in claim 4 wherein both said rollbacks have radially inward extending locking notches and a locking element adapted to engage both of said locking notches.
Claim 17
Dependent Claim
32 words
A mortise type lock as in claim 5 wherein said locking slide contains a pair of opposite projecting lugs, said lugs engageable within sloted openings in respective opposite walls of said case.
Claim 18
Dependent Claim
56 words
A mortise type lock as in claim 1 wherein said retract arm contains; a bearing portion coaxial with said pivotal mounting, an overlying portion supporting said angular cam surfaces, a torsion spring acting between said case and an aperature in said overlying portion, the helical portion of said torsion spring coaxially positioned about said bearing portion.
Claim 19
Dependent Claim
22 words
A mortise type lock as in claim 4 wherein both said rollbacks are supported in said case by low friction bearing inserts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |