Patent US4015456A successfully refreshed from Google Patents.
US4015456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plunger-operated lock
Assignee: EJ Brooks Co
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Filing: 1976-06-28
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Granted: 1977-04-05
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Expires: 1996-06-28
Abstract
Abstract A lock of the type having an internal plunger with a stem for being gripped by a tool to pull the stem axially to release locking means, in which said stem has a separate portion protruding from the rear end which is spring biased against the forward portion of the stem. When attempts are made by unauthorized persons to open the lock by forcing an elongated member (such as a piece of tubing) into engagement with the protruding portion, the protruding portion is driven back into the forward portion, so that the tubing cannot become engaged therewith.
Inventors
- 👤 Sigurd M. Moberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:54
CPC Classifications
E; E05; E05B; E05B67/00; E05B67/36; E05B67/365; Y; Y10; Y10T; Y10T70/00; Y10T70/40; Y10T70/413; Y10T70/437; Y10T70/439; Y10T70/443; Y10T70/70; Y10T70/7441; Y10T70/7751; Y10T70/778; Y10T70/7791; Y10T70/7802
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A lock of the plunger operated type, having a housing open at one end, a lock operating plunger axially movable in the housing and biased forwardly away the open end and a tool-engagable member mounted on the operating plunger said member being spring biased to normally extend rearwardly therefrom and being movable forwardly into an inaccessible position on the application of a forward axial force thereto.
Claim 2
Dependent Claim
66 words
A lock of the plunger operated type, having a housing open at one end, a lock operating plunger axially movable in the housing and biased forwardly away the open end and a tool-engagable member mounted on the operating plunger said member being spring biased to normally extend rearwardly therefrom and being movable forwardly into an inaccessible position on the application of a forward axial force thereto.
Claim 3
Dependent Claim
114 words
A lock as set forth in claim 1 in which said plunger has a cavity opening to the rear end thereof, a cover plate having a central opening disposed over the cavity opening, said tool engagable member having an enlarged head portion disposed in the cavity and a tool-engagable portion extending from the head portion through the central opening of the cover plate, spring bias means in the cavity biasing the tool-engagable member to the extended position for grasping by a tool for pulling the plunger toward the open end of the housing, said tool-engagable portion being movable through the cover plate into the cavity on the application of an axial forward force thereto.
Claim 4
Dependent Claim
100 words
A lock of the plunger operated type having an elongated housing open at one end, a lock operating plunger axially movable in the housing, said plunger being spring biased forwardly away from the open end into the locking position and a tool-engagable member mounted in the plunger and extending rearwardly therefrom toward the open end of the housing, said member being spring biased into the rear position for grasping by a tool to pull the plunger rearwardly into the unlocking position, and being movable into the plunger into an inaccessible position by the application of a forward axial force thereto.
Claim 5
Dependent Claim
100 words
A lock of the plunger operated type having an elongated housing open at one end, a lock operating plunger axially movable in the housing, said plunger being spring biased forwardly away from the open end into the locking position and a tool-engagable member mounted in the plunger and extending rearwardly therefrom toward the open end of the housing, said member being spring biased into the rear position for grasping by a tool to pull the plunger rearwardly into the unlocking position, and being movable into the plunger into an inaccessible position by the application of a forward axial force thereto.
Claim 6
Dependent Claim
50 words
A plunger operated lock as set out in claim 3 in which the plunger has a cavity opening to the rear end thereof, said tool-engageable member is retained in the cavity normally protruding therefrom and retreats into the cavity on the application of an axial forward force against the member.
Claim 7
Dependent Claim
151 words
A plunger operated lock of the type having a housing open at one end, a plunger in the housing and axially movable between a forward position in which the plunger retains locking elements in a locking position and a rear position in which the locking elements can move to a non-locking position and in which means is provided on the plunger extending toward the open end for grasping by a suitable tool to pull the plunger to the unlocking position, in which the rear end of the plunger is provided with a cavity and a separate pin is mounted in said cavity and is biased rearwardly to normally protrude from the rear of the plunger for grasping by a tool to pull the plunger rearwardly into the unlocking position, said pin being movable forwardly into said cavity so as to be inaccessible in response to a forward axial force applied thereto.
Claim 8
Dependent Claim
151 words
A plunger operated lock of the type having a housing open at one end, a plunger in the housing and axially movable between a forward position in which the plunger retains locking elements in a locking position and a rear position in which the locking elements can move to a non-locking position and in which means is provided on the plunger extending toward the open end for grasping by a suitable tool to pull the plunger to the unlocking position, in which the rear end of the plunger is provided with a cavity and a separate pin is mounted in said cavity and is biased rearwardly to normally protrude from the rear of the plunger for grasping by a tool to pull the plunger rearwardly into the unlocking position, said pin being movable forwardly into said cavity so as to be inaccessible in response to a forward axial force applied thereto.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |