Patent US3751952A successfully refreshed from Google Patents.
US3751952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact cylinder lock
Assignee: Briggs and Stratton Corp
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Filing: 1971-12-27
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Granted: 1973-08-14
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Expires: 1991-12-27
Abstract
Abstract A lock cylinder is confined against forward displacement out of a body in which it rotates by a circumferential land near its rear end, overlying the rear face of the body. Overlying the rear face of the land, a hook-shaped lug on the body prevents rearward cylinder displacement. In an assembling position of rotation the cylinder is insertable forwardly into the body because a discontinuity in the land allows it to pass the lug. The cylinder is normally confined against rotation to said assembling position by stop means comprising a stop member similar to a plate tumbler, but not key actuated, engageable with an abutment inside the body defined by a tumbler groove.
Inventors
- 👤 H Rubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:31
CPC Classifications
E; E05; E05B; E05B29/00; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7638; Y10T70/7644
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
370 words
In a lock comprising a lock body having a bore therethrough wherein a cylinder that carries key retractable tumbler means is key rotatable in opposite directions through a normal range between defined rotational positions, means for normally confining the cylinder to rotation in the body and providing for insertion of the cylinder into the body from the rear thereof and for its rearward withdrawal from the body, said means comprising: A. lug-like means on the body defining a forwardly facing ledge surface which is spaced to the rear of a flat rear surface on the body that is normal to the axis of the bore; B. a circumferentially exTending land on the rear portion of the cylinder, normally slidably received between said lug-like means and said rear surface of the body to cooperate with them in confining the cylinder against axial displacement relative to the body, said land having a discontinuity which clears the lug-like means when the cylinder is in an assembling position of rotation that is outside said normal range, to provide for axial inserting and withdrawing movement of the cylinder relative to the body; C. a stop member carried by the portion of the cylinder that is normally in said bore, said stop member being confined to movement transversely to the cylinder axis between an extended position projecting radially beyond the cylindrical surface of the cylinder and a retracted position that allows the cylinder to be axially inserted into the body; D. biasing means reacting between the cylinder and the stop member to yieldingly urge the stop member to its extended position; and E. the body having a groove extending circumferentially partway around its bore and opening radially inwardly thereto, said groove being radially opposite the stop member when the cylinder is normally in the bore, to receive the projecting portion of the stop member and permit rotation of the cylinder through its normal range, and the body having an abutment defined by one end of said groove which is engageable by the stop member to define one of said rotational positions at the limits of said normal range and thus prevent the cylinder from being rotated to its assembling position of rotation relative to the body.
Claim 2
Dependent Claim
370 words
In a lock comprising a lock body having a bore therethrough wherein a cylinder that carries key retractable tumbler means is key rotatable in opposite directions through a normal range between defined rotational positions, means for normally confining the cylinder to rotation in the body and providing for insertion of the cylinder into the body from the rear thereof and for its rearward withdrawal from the body, said means comprising: A. lug-like means on the body defining a forwardly facing ledge surface which is spaced to the rear of a flat rear surface on the body that is normal to the axis of the bore; B. a circumferentially exTending land on the rear portion of the cylinder, normally slidably received between said lug-like means and said rear surface of the body to cooperate with them in confining the cylinder against axial displacement relative to the body, said land having a discontinuity which clears the lug-like means when the cylinder is in an assembling position of rotation that is outside said normal range, to provide for axial inserting and withdrawing movement of the cylinder relative to the body; C. a stop member carried by the portion of the cylinder that is normally in said bore, said stop member being confined to movement transversely to the cylinder axis between an extended position projecting radially beyond the cylindrical surface of the cylinder and a retracted position that allows the cylinder to be axially inserted into the body; D. biasing means reacting between the cylinder and the stop member to yieldingly urge the stop member to its extended position; and E. the body having a groove extending circumferentially partway around its bore and opening radially inwardly thereto, said groove being radially opposite the stop member when the cylinder is normally in the bore, to receive the projecting portion of the stop member and permit rotation of the cylinder through its normal range, and the body having an abutment defined by one end of said groove which is engageable by the stop member to define one of said rotational positions at the limits of said normal range and thus prevent the cylinder from being rotated to its assembling position of rotation relative to the body.
Claim 3
Dependent Claim
53 words
The lock of claim 1 further characterized by: the cylinder having a radially projecting bolt at its rear which normally overlies said rear surface on the body and which is engageable with said lug-like means to define the other of said rotational positions at the limits of said normal range of cylinder rotation.
Claim 4
Dependent Claim
65 words
The lock of claim 1, further characterized by: said groove being of taperingly decreasing depth in the circumferential direction away from said abutment, to cam the stop member radially inwardly against the yielding force of said biasing means as the cylinder is rotated away from its said position defined by the abutment, thereby providing a detent action as the cylinder is rotated toward that position.
Claim 5
Dependent Claim
72 words
The lock of claim 3 wherein said abutment is circumferentially displaced around the bore from said lug, further characterized by: said land having a second and smaller discontinuity axially in line with the projecting end portion of the stop member through which a probe can be inserted for depressing the stop member to its retracted position so that the cylinder can be rotated to its assembling position for withdrawal from the body.
Claim 6
Dependent Claim
306 words
In a lock comprising a lock body having a bore therethrough and axially extending circumferentially spaced apart tumbler grooves in said bore, a cylinder which carries key actuatable tumblers and which is rotatable in said bore through a normal range between key releasing positions at each of which the tumblers can project partway into one of said grooves, and cooperating means on the cylinder and on the body for defining one of said key releasing positions and which are normally slidingly interengaged to prevent axial displacement of the cylinder relative to the body, said cooperating means being disengageable upon rotation of the cylinder to an assembling position that is outside said normal range to permit the cylinder to be axially inserted into and withdrawn from the body: A. a stop member received in a portion of the cylinder that is normally within the bore, and which is confined to motion relative to the cylinder in opposite directions transverse to its axis between a projected position in which an end portion of the stop member projects radially beyond the side surface of the cylinder and a retracted position; B. biasing means reacting between the cylinder and the stop member to urge the latter tOward its projected position; C. the body having a circumferentially extending groove that receives said end portion of the stop member when the cylinder is within its normal range of rotation, and having a circumferentially facing surface that is engageable by the stop member to define the other of said key releasing positions; D. said stop member being flat and being slidable edgewise in a slot in the cylinder that is transverse to the cylinder axis; and E. said stop member being substantially U-shaped, with legs disposed at opposite sides of the key slot and with its bight portion comprising its said end portion.
Claim 7
Dependent Claim
306 words
In a lock comprising a lock body having a bore therethrough and axially extending circumferentially spaced apart tumbler grooves in said bore, a cylinder which carries key actuatable tumblers and which is rotatable in said bore through a normal range between key releasing positions at each of which the tumblers can project partway into one of said grooves, and cooperating means on the cylinder and on the body for defining one of said key releasing positions and which are normally slidingly interengaged to prevent axial displacement of the cylinder relative to the body, said cooperating means being disengageable upon rotation of the cylinder to an assembling position that is outside said normal range to permit the cylinder to be axially inserted into and withdrawn from the body: A. a stop member received in a portion of the cylinder that is normally within the bore, and which is confined to motion relative to the cylinder in opposite directions transverse to its axis between a projected position in which an end portion of the stop member projects radially beyond the side surface of the cylinder and a retracted position; B. biasing means reacting between the cylinder and the stop member to urge the latter tOward its projected position; C. the body having a circumferentially extending groove that receives said end portion of the stop member when the cylinder is within its normal range of rotation, and having a circumferentially facing surface that is engageable by the stop member to define the other of said key releasing positions; D. said stop member being flat and being slidable edgewise in a slot in the cylinder that is transverse to the cylinder axis; and E. said stop member being substantially U-shaped, with legs disposed at opposite sides of the key slot and with its bight portion comprising its said end portion.
Claim 8
Dependent Claim
165 words
A lock comprising a lock body having a bore and a cylinder therein rotatable in opposite directions through a normal range between defined rotational positions, characterized by: A. first cooperating stop members on the body and the cylinder to define one of said rotational positions; B. second cooperating stop members on the body and the cylinder to preclude axial displacement of the cylinder from the bore in one direction except upon rotation of the cylinder toward and beyond the other of its said rotational positions to a disassembly position outside of said normal range; and C. means other than said first and second stop members providing third cooperating stop members on the body and the cylinder to define the other of said rotational positions of the cylinder, one of said third stop members being movable relative to all of the other stop members to an inoperative position to enable the cylinder to be rotated beyond its said other rotational position to said disassembly position thereof.
Claim 9
Dependent Claim
165 words
A lock comprising a lock body having a bore and a cylinder therein rotatable in opposite directions through a normal range between defined rotational positions, characterized by: A. first cooperating stop members on the body and the cylinder to define one of said rotational positions; B. second cooperating stop members on the body and the cylinder to preclude axial displacement of the cylinder from the bore in one direction except upon rotation of the cylinder toward and beyond the other of its said rotational positions to a disassembly position outside of said normal range; and C. means other than said first and second stop members providing third cooperating stop members on the body and the cylinder to define the other of said rotational positions of the cylinder, one of said third stop members being movable relative to all of the other stop members to an inoperative position to enable the cylinder to be rotated beyond its said other rotational position to said disassembly position thereof.
Claim 10
Dependent Claim
44 words
The lock of claim 6, further characterized by: A. said cylinder having a number of identical tumbler slots and key operable tumblers mounted in all but one of said slots; B. and said one stop member being movably mounted in the remaining tumbler slot.
Claim 11
Dependent Claim
35 words
The lock of claim 6 wherein said bore opens to the front and to the rear of the lock body; and said first and second stop members are located at the rear of the body.
Claim 12
Dependent Claim
53 words
The lock of claim 5, wherein said circumferentially extending groove has a junction with one of said tumbler grooves, and taperingly increases in depth toward said junction, and wherein the side surface of said tumbler groove that is opposite said junction defines said circumferentially facing surface that is engageable by the stop member.
Claim 13
Dependent Claim
102 words
The lock of claim 9, further characterized by: A. the bight portion of the stop member having an abutment edge portion that engages the side surface of said one tumbler groove that is opposite the junction of said circumferentially extending groove with said tumbler groove, to define said other key releasing position of the cylinder; and B. the bight portion of the stop member having a curved edge portion that extends from said abutment edge portion and is receivable partly in said one tumbler groove and partly in said circumferentially extending groove when the cylinder is in said other key releasing position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |