US3423547A - Break-glass station with slide switch protected against false operation - Google Patents
Break-glass station with slide switch protected against false operation Download PDFInfo
- Publication number
- US3423547A US3423547A US671837A US3423547DA US3423547A US 3423547 A US3423547 A US 3423547A US 671837 A US671837 A US 671837A US 3423547D A US3423547D A US 3423547DA US 3423547 A US3423547 A US 3423547A
- Authority
- US
- United States
- Prior art keywords
- switch
- break
- slide switch
- protected against
- slide
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/022—Emergency operating parts, e.g. for stop-switch in dangerous conditions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/022—Emergency operating parts, e.g. for stop-switch in dangerous conditions
- H01H2003/0233—Emergency operating parts, e.g. for stop-switch in dangerous conditions for alarm triggering, e.g. fire alarm, emergency off switches operated by breaking a glass
Definitions
- FIG.2 H. L. CARETTO -GLASS STATION WITH SLIDE SWITCH PROTECTED v BREAK AGAINST FALSE OPERATION Filed Sept. 29, 1967 FIG.2
- Special objects of the present invention have been to provide a safe, simple, low cost form of break-glass signal transmitter having a direct straight line operating movement, protected against accidental or unintentional operation.
- FIG. 1 is a part sectional front elevation of a fire alarm station form of the invention in the normal ready condition.
- FIG. 2 is a side elevation of the same, partly in section as on the line 2-2 in FIG. 1.
- FIG. 3 is a broken top plan View of the station.
- an open front call box 7 having a cover in the form of a face plate 8, carrying the usual fire alarm operating instructions and having, in its central portion, a vertically extending slot 9.
- a slide type of switch is disposed in this slot, incorporating a vertically operating slide member provided with a forwardly or outwardly projecting finger hold 11.
- This switch is shown firmly secured thus positioned, substantially closing the slot, by screws 12, passed through lugs 13 at upper and lower ends of the base of the switch, into the supporting face plate.
- Connections running from the switch are not shown, but these ordinarily are such as to keep the switch armed, ready to send in a signal, in the upper position of the switch operating slide and to initiate the desired signal in the lowering movement of the slide.
- guard wall 14 on the face plate, partially surrounding the slot, with parallel side portions 15 at opposite sides of the slot and an overhead bridging portion 16, over the upper end of the slot.
- This guard wall projects beyond the finger piece 11 of the switch slide so as to prevent operation of the switch by an object traversing the face of the call box.
- the lower ends of the C-shaped projection are shown as rounded off at 17 to deflect upwardly traveling objects away from the switch control and this guard'wall is made heavy enough, as by being an integral portion of the face plate, which ordinarily may be a casting, to resist blows of a heavy object that might be directed at such a signal box.
- the break-glass control is provided in the illustration by a rod 18 of glass or other suitable frangible material, seated in sockets 19, 20, in the opposite side portions 15 of the guard wall and extending in readily breakable relation between these wall portions, immediately below the projecting switch control.
- One socket 19 is shown as of closed end formation and the other 20 as open ended so that broken rods may be readily removed and replaced after removal of the closure screw 21, entered in the outer end of the through opening 20.
- the slide switch may be of small size and the location of it in the slot in the face plate keeps the overall dimensions down so that the box is kept down to a moderate size.
- the downwardly faced C-shaped guard While not obstructing or delaying considered legitimate operation of the switch, does, in effect, put a protective hood over the switch and restraining element, but open at the bottom for quick, free proper signal transmitting operation of the switch.
- This intended operation is a straight downward movement readily effected without hindrance from the partially surrounding protective wall.
- the switch shown is of the spring loaded type, mounted with the operating slide of the same spring biased in the downward direction of signal switching movement and restrained in the upper, non-signaling position by the breakable rod, so that upon fracture of this rod by any means, the switch will automatically initiate signal.
- a break-glass station comprising the combination of an open front signal box,
- said face plate having a vertically extending slot in the central portion of the same, and an outwardly projecting guard wall extending in downwardly facing C-shaped form along both sides and across the top of said slot,
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- Push-Button Switches (AREA)
Description
Jan. 21, 1969 H. L. CARETTO -GLASS STATION WITH SLIDE SWITCH PROTECTED v BREAK AGAINST FALSE OPERATION Filed Sept. 29, 1967 FIG.2
FIG.|
UNAE @F INVENTOR.
HOWARD L. CARETTO FIG.3
MXW
ATTORNEY United States Patent 4 Claims ABSTRACT OF THE DISCLOSURE Signal transmitting slide switch with an operating projection restrained by a breakable rod and with exposed parts protected against accidental operation by an outstanding guard wall partially surrounding the same.
Special objects of the present invention have been to provide a safe, simple, low cost form of break-glass signal transmitter having a direct straight line operating movement, protected against accidental or unintentional operation.
These and other desirable objects have been accomplished by a novel combination of parts illustrated by way of example in the drawing accompanying and forming part of this specification.
FIG. 1 is a part sectional front elevation of a fire alarm station form of the invention in the normal ready condition.
FIG. 2 is a side elevation of the same, partly in section as on the line 2-2 in FIG. 1.
FIG. 3 is a broken top plan View of the station.
In these views the invention is shown applied to an open front call box 7, having a cover in the form of a face plate 8, carrying the usual fire alarm operating instructions and having, in its central portion, a vertically extending slot 9.
A slide type of switch is disposed in this slot, incorporating a vertically operating slide member provided with a forwardly or outwardly projecting finger hold 11.
This switch is shown firmly secured thus positioned, substantially closing the slot, by screws 12, passed through lugs 13 at upper and lower ends of the base of the switch, into the supporting face plate.
Connections running from the switch are not shown, but these ordinarily are such as to keep the switch armed, ready to send in a signal, in the upper position of the switch operating slide and to initiate the desired signal in the lowering movement of the slide.
To guard this switch against accidental or unintentional operation, there is provided an outstanding, downwardly faced C-shaped guard wall 14, on the face plate, partially surrounding the slot, with parallel side portions 15 at opposite sides of the slot and an overhead bridging portion 16, over the upper end of the slot.
This guard wall projects beyond the finger piece 11 of the switch slide so as to prevent operation of the switch by an object traversing the face of the call box.
The lower ends of the C-shaped projection are shown as rounded off at 17 to deflect upwardly traveling objects away from the switch control and this guard'wall is made heavy enough, as by being an integral portion of the face plate, which ordinarily may be a casting, to resist blows of a heavy object that might be directed at such a signal box.
The break-glass control is provided in the illustration by a rod 18 of glass or other suitable frangible material, seated in sockets 19, 20, in the opposite side portions 15 of the guard wall and extending in readily breakable relation between these wall portions, immediately below the projecting switch control.
ice
One socket 19 is shown as of closed end formation and the other 20 as open ended so that broken rods may be readily removed and replaced after removal of the closure screw 21, entered in the outer end of the through opening 20.
The slide switch may be of small size and the location of it in the slot in the face plate keeps the overall dimensions down so that the box is kept down to a moderate size.
The downwardly faced C-shaped guard, While not obstructing or delaying considered legitimate operation of the switch, does, in effect, put a protective hood over the switch and restraining element, but open at the bottom for quick, free proper signal transmitting operation of the switch. This intended operation is a straight downward movement readily effected without hindrance from the partially surrounding protective wall.
The C-shaped guard wall, with the breakable restraining rod closing the open side of the same, form an enclosure over and about the switch mechanism preventing tampering with that mechanism.
The switch shown is of the spring loaded type, mounted with the operating slide of the same spring biased in the downward direction of signal switching movement and restrained in the upper, non-signaling position by the breakable rod, so that upon fracture of this rod by any means, the switch will automatically initiate signal.
What is claimed is:
1. A break-glass station comprising the combination of an open front signal box,
a removable face plate closing the front of the box,
said face plate having a vertically extending slot in the central portion of the same, and an outwardly projecting guard wall extending in downwardly facing C-shaped form along both sides and across the top of said slot,
a slide switch mounted on the slotted portion of said face plate and having a forwardly projecting operating finger hold projecting into the space defined by said reversed C-shaped guard wall, and
a breakable rod of frangible material extending across said slot, between said portions of the guard wall at opposite sides of the slot therein and beneath said forwardly projecting finger hold of the slide switch.
2. The invention according to claim 1 with said slide switch disposed within said slot and having a base extended over the surface of the face plate and screw means extending through the extended portions of said base into said face plate.
3. The invention according to claim 1 with said slide switch having a base portion extended over the surface of said face plate and screw means connecting said base portion to said face plate.
4. The invention according to claim 1 in which said slide switch is spring loaded in the downwardly directed movement of the switch slide and normally restrained by said breakable rod so that on fracture of said rod said switch will automatically effect the desired signaling operation.
References Cited UNITED STATES PATENTS 2,726,381 12/1955 Verkuil 200--61.08 2,822,451 2/1958 Holmes 2006l.08
ROBERT K. SCHAEFER, Primary Examiner.
H. O. I ONES, Assistant Examiner.
U.S. Cl. X.R.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US67183767A | 1967-09-29 | 1967-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3423547A true US3423547A (en) | 1969-01-21 |
Family
ID=24696062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US671837A Expired - Lifetime US3423547A (en) | 1967-09-29 | 1967-09-29 | Break-glass station with slide switch protected against false operation |
Country Status (1)
Country | Link |
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US (1) | US3423547A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030076216A1 (en) * | 2001-09-03 | 2003-04-24 | Christoph Pfenninger | Manual call point |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2726381A (en) * | 1952-04-23 | 1955-12-06 | Edwards Company Inc | Alarm signal station |
US2822451A (en) * | 1955-12-07 | 1958-02-04 | Willis G Holmes | Alarm sending station |
-
1967
- 1967-09-29 US US671837A patent/US3423547A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2726381A (en) * | 1952-04-23 | 1955-12-06 | Edwards Company Inc | Alarm signal station |
US2822451A (en) * | 1955-12-07 | 1958-02-04 | Willis G Holmes | Alarm sending station |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030076216A1 (en) * | 2001-09-03 | 2003-04-24 | Christoph Pfenninger | Manual call point |
US6674032B2 (en) * | 2001-09-03 | 2004-01-06 | Siemens Building Technologies Ag | Manual call point |
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