USH185H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator perimetry device
Assignee: United States Department of the Army
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Filing: 1985-11-25
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Granted: 1987-01-06
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Expires: 2005-11-25
Abstract
Abstract A device for measuring the field of vision for a person wearing a mask indes a mask support to which the mask can be clamped and which is horizontally movable for aligning one of the subject's eyes with a horizontal axis. A scale support carries a scale member that is rotatably mounted around the horizontal axis and which carries a slidable indicator which can be slid to angles from 0° to 90° with respect to the axis. A mirror is attached to the scale support and lies on the axis for aiding and aligning on the subject's eye with the axis. A pointer is connected to a far end of the scale member and is used to locate the vertical perpendicular position of the subject's eye on the horizontal axis. The scale member is rotatably mounted on the scale support about the horizontal axis and the scale support is movable vertically to bring the horizontal axis into alignment with the subject's eye. The scale support can also be moved horizontally in the direction perpendicular to the horizontal movement of the mask support so that the pointer can be brought into its correct position above the subject's eye. With the device correctly oriented with respect to the subject's eye, the scale member can be brought into a plurality of different rotational positions around the horizontal axis and in each position the indicator used to measuring the maximum field of view from 0° to 90° for the subject's eye.
Inventors
- 👤 Richard W. McMahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:20
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
239 words
A perimetry device for measuring the field of vision for a subject wearing a mask, comprising: a base; a mask support for supporting a mask and which is horizontally movable in a first direction on the base; a scale support for supporting a scale member, said scale support being mounted for movement to the base in a second horizontal direction; mask clamping means connected to said mask support for clamping a mask to said mask support; an angle measuring scale member rotatably mounted to said scale support about a horizontal axis which is parallel to said second horizontal direction, said scale member having an end remote from said scale support; a pointer connected to said end of said scale member for pointing along an axis which is perpendicular to said horizontal axis and adapted for pointing downwardly at an eye of a subject wearing a mask clamped in said mask clamping means; a vision indicator slidable along said scale member and viewable by a subject for determining a maximum angular field of vision away from said horizontal axis; an eye alignment mirror connected to said scale support and lying on said horizontal axis for aiding an alignment of the subject's eye with the horizontal axis; and a vision angle indicator connected to said scale member mounted for rotation with said scale member on said scale support for indicating a rotational position of said scale member around said horizontal axis.
Claim 2
Dependent Claim
239 words
A perimetry device for measuring the field of vision for a subject wearing a mask, comprising: a base; a mask support for supporting a mask and which is horizontally movable in a first direction on the base; a scale support for supporting a scale member, said scale support being mounted for movement to the base in a second horizontal direction; mask clamping means connected to said mask support for clamping a mask to said mask support; an angle measuring scale member rotatably mounted to said scale support about a horizontal axis which is parallel to said second horizontal direction, said scale member having an end remote from said scale support; a pointer connected to said end of said scale member for pointing along an axis which is perpendicular to said horizontal axis and adapted for pointing downwardly at an eye of a subject wearing a mask clamped in said mask clamping means; a vision indicator slidable along said scale member and viewable by a subject for determining a maximum angular field of vision away from said horizontal axis; an eye alignment mirror connected to said scale support and lying on said horizontal axis for aiding an alignment of the subject's eye with the horizontal axis; and a vision angle indicator connected to said scale member mounted for rotation with said scale member on said scale support for indicating a rotational position of said scale member around said horizontal axis.
Claim 3
Dependent Claim
38 words
A device according to claim 1, including a first guideway connected to said base, a mask support slide slidably mounted in said first guideway in said first horizontal direction, said mask support being connected to said first slide.
Claim 4
Dependent Claim
41 words
A device according to claim 2, including a second guideway connected to said base, a scale support slide slidably mounted to said second guideway for movement in said second horizontal direction, said scale support being connected to said scale support slide.
Claim 5
Dependent Claim
63 words
A device according to claim 1, including a scale member guideway connected to said base and extending in said second horizontal direction, a scale support slide slidably mounted in said guideway for movement in said second horizontal direction, a post connected to said scale support slide and extending upwardly from said guideway, said scale support being mounted for horizontal movement to said post.
Claim 6
Dependent Claim
115 words
A device according to claim 1, including a mask support guideway connected to said base and extending in said first horizontal direction, a mask support slide slidably mounted in said guideway for movement in said second horizontal direction, said mask support being connected to and extending upwardly from said mask support slide, said mask clamping means comprising a lower strap connected to said mask support, an upper strap movably mounted to said lower strap, said upper and lower strap defining an opening for receiving a portion of the mask, and a clamp connected between said upper and lower strap for fixing said upper and lower strap together to move a portion of the mask therebetween.
Claim 7
Dependent Claim
63 words
A device according to claim 5, including a scale member guideway connected to said base and extending in said second horizontal direction, a scale support slide slidably mounted in said guideway for movement in said second horizontal direction, a post connected to said scale support slide and extending upwardly from said guideway, said scale support being mounted for horizontal movement to said post.
Claim 8
Independent Claim
174 words
A method of measuring the field of vision for the eye of a subject wearing a mask comprising clamping the mask to a mask support, moving the mask support in a first horizontal direction to align the subject's eye with a selected horizontal axis, supporting an angle measuring scale member on a scale support and for rotation about a rotation axis to the scale support, moving the scale support vertically to align the rotation axis of the scale member with the horizontal axis which is for alignment with the subject's eye, the scale member having an end remote from the scale support with a pointer extending and pointing in a perpendicular axis which is perpendicular to the horizontal axis, moving the scale support in a second horizontal direction which is perpendicular to the first horizontal direction to bring the perpendicular axis into alignment with the subject's eye, and moving the indicator along the scale member from a location near the horizontal axis toward the pointer until the subject can no longer see the indicator.
Claim 9
Independent Claim
174 words
A method of measuring the field of vision for the eye of a subject wearing a mask comprising clamping the mask to a mask support, moving the mask support in a first horizontal direction to align the subject's eye with a selected horizontal axis, supporting an angle measuring scale member on a scale support and for rotation about a rotation axis to the scale support, moving the scale support vertically to align the rotation axis of the scale member with the horizontal axis which is for alignment with the subject's eye, the scale member having an end remote from the scale support with a pointer extending and pointing in a perpendicular axis which is perpendicular to the horizontal axis, moving the scale support in a second horizontal direction which is perpendicular to the first horizontal direction to bring the perpendicular axis into alignment with the subject's eye, and moving the indicator along the scale member from a location near the horizontal axis toward the pointer until the subject can no longer see the indicator.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |