Cutting – Tool carrier or guide affixed to work during cutting – Entirely work supported
Patent
1994-12-20
1996-12-17
Peterson, Kenneth E.
Cutting
Tool carrier or guide affixed to work during cutting
Entirely work supported
83660, 225103, B26F 124
Patent
active
055842194
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a release device for a multi glaze air cushion or thermal insulation barrier.
In the field of double or multi glazed glass units for doors and windows, the space(s) between the panes of glass form(s) air cushion(s) or thermal insulation barrier(s), and it is these air cushions or barriers which makes the breakage of the glass extremely difficult and in many cases impossible. Whilst this is very useful and more than advantageous to prevent forced entry through a double or multi glazed unit, the very same air cushion or thermal insulation barrier constitutes a real hazard should it be necessary for a person to make a hurried exit--via the window--from a room fitted with a double or multi glazed unit. In such circumstances, for example in the case of fire, it is virtually impossible for the person to break the glass and leave via the window in the event that any other exits are unusable.
The type of hazard related above is lessened to some degree when the window has an opening sash of sufficient dimensions and suitably positioned to enable exit there-through, but the possibility of a necessarily hurried exit is not precluded and it is unlikely that such a hurried exit would be possible through such a restricted opening.
In most instances, double or multi glazed windows are sealed directly into a frame without an opening sash, and even where an opening sash is provided, the dimensions of such a sash are likely to be too small to enable a hurried exit to take place, or there may be window accessories that decrease the actual opening dimensions available or that create protrusions or obstacles constituting a danger for a person to make a hurried exit.
The present invention seeks to provide means whereby the air cushion or thermal insulation barrier between the panes of glass of a double or multi glazed glass unit may be released so as to enable said panes of glass to be broken.
According to the present invention there is provided a release device for an air cushion or thermal insulation barrier of a double or multi glazed glass unit, said release device comprising interfitting first and second members which are movable relative to one another, said first member having associated therewith a pin or striker which is adapted to move with said first member relative to said second member from a first inoperative position to a second operative position so as to penetrate a glass panel of said unit, characterized in that said device includes means to enable release of an air cushion or thermal insulation barrier of said glazed unit, said means comprising one through-bore or aperture.
The pin or striker will preferably be carried by and project from a carrier plate which is secured to said first member so as to be movable with said first member upon movement thereof relative to said second member.
The second member will have a through-bore therein to enable passage of a leading end of the pin or striker therethrough upon movement of the first member relative to the second member.
Means will preferably be provided to effectively limit the relative movement of the first and second members
The carrier plate will preferably incorporate at least one through-bore or aperture to enable release of the air cushion or thermal insulation barrier from the said glazed unit. More preferably, there will be two such through-bores or apertures.
The pin or striker may have a pointed leading end, or the said leading end may be flat, or the said leading end may have a concave or convex bevel
The device may include one or more springs to return the pin or striker to its initial inoperative position.
The device may include a safety pull ring or pin to prevent inadvertent movement of said first member relative to said second member.
The carrier plate may be movable relative to the first and second members.
The device may be mounted for pivotal movement from an inoperative position to an operative position relative to a pane of glass to be penetrated.
In order that the invention may be more readily understood, embodim
REFERENCES:
patent: 1401968 (1922-01-01), Domer
patent: 3180524 (1965-04-01), Shepard et al.
patent: 4428518 (1984-01-01), Abel
Dunn Carole A.
Dunn Kenneth R.
Peterson Kenneth E.
Pryor Sean A.
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