US4731806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grid moving apparatus for radiography
Assignee: Toshiba Corp
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Filing: 1986-03-21
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Granted: 1988-03-15
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Expires: 2006-03-21
Abstract
Abstract A grid moving apparatus for X-ray radiographing comprises a grid for eliminating a scattered X-ray beam, said grid having X-ray transmitting regions and X-ray non-transmitting regions alternately arranged, swinging mechanism for swinging said grid at a radiographing position, and escape mechanism for removing said grid from the radiographing position to a non-radiographing position. The apparatus further comprises engaging mechanism for detachably engaging said swinging mechanism and said grid, in which said grid and said swinging mechanism are engaged with each other to swing the grid, and said grid is disengaged from said swinging mechanism to be removed.
Inventors
- 👤 Hideo Takahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:35
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A grid moving apparatus for an x-ray radiographing apparatus, comprising: a grid for eliminating a scattered X-ray beam, said grid having X-ray transmitting regions and x-ray non-transmitting regions alternately arranged; reciprocating means for reciprocating said grid at a constant frequency between imaging positions, said reciprocating means having a motor and a crank shaft for converting rotation of said motor into a linear motion; removing means for moving said grid between an imaging position and a non-imaging position; and engaging means for detachably engaging said reciprocating means and said grid, said engaging means having an engaging member provided at the distal end portion of said crank shaft and a spring means for pressing said engaging member to be frictionally engaged with said grid. wherein said grid and said reciprocating means are engaged with each other to reciprocate the grid, and said reciprocating means and said grid are disengaged from each other to move said grid between said imaging position and said non-imaging position.
Claim 2
Dependent Claim
162 words
A grid moving apparatus for an x-ray radiographing apparatus, comprising: a grid for eliminating a scattered X-ray beam, said grid having X-ray transmitting regions and x-ray non-transmitting regions alternately arranged; reciprocating means for reciprocating said grid at a constant frequency between imaging positions, said reciprocating means having a motor and a crank shaft for converting rotation of said motor into a linear motion; removing means for moving said grid between an imaging position and a non-imaging position; and engaging means for detachably engaging said reciprocating means and said grid, said engaging means having an engaging member provided at the distal end portion of said crank shaft and a spring means for pressing said engaging member to be frictionally engaged with said grid. wherein said grid and said reciprocating means are engaged with each other to reciprocate the grid, and said reciprocating means and said grid are disengaged from each other to move said grid between said imaging position and said non-imaging position.
Claim 3
Dependent Claim
32 words
An apparatus according to claim 1, wherein said engaging means comprises a recess formed on a side of said grid, which is engaged with an upper end portion of said engaging member.
Claim 4
Dependent Claim
37 words
An apparatus according to claim 2, wherein the upper end portion of said engaging member is formed in a semispherical shape and said recess is also formed in a semi-spherical shape to receive said upper end portion.
Claim 5
Dependent Claim
37 words
An apparatus according to claim 3, wherein said engaging means includes a boss having a hole for slidably housing said engaging member and having a coil spring for biasing said engaging member upward disposed in said hole.
Claim 6
Dependent Claim
35 words
An apparatus according to claim 1, wherein said removing means includes a motor, a pulley rotated by said motor, and a wire looped around said pulley, and having two end portions coupled to said grid.
Claim 7
Dependent Claim
35 words
An apparatus according to claim 5, wherein said wire is coupled to said grid through a spring which absorbs shocks when said grid is moved between an imaging position and a non-imaging position and stopped.
Claim 8
Dependent Claim
24 words
An apparatus according to claim 5, wherein said pulley is provided with a clutch for engaging or disengaging a driving force of said motor.
Claim 9
Dependent Claim
16 words
An apparatus according to claim 1, wherein said grid has a density of approximately 34 elements/cm.
Claim 10
Dependent Claim
18 words
An apparatus according to claim 1, wherein said grid has a thickness of approximately 2 to 3 mm.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 8, wherein said grid has a thickness of approximately 2 to 3 mm.
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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |