US3759106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas or dust detecting and measuring apparatus
Assignee: Draegerwerk AG and Co KGaA
•
Filing: 1972-09-08
•
Granted: 1973-09-18
•
Expires: 1992-09-08
Abstract
Abstract The apparatus includes a bellows pump for drawing in a sample to be analyzed, with the pump having a movable part and being expanded by spring bias, during a working stroke, and collapsed, by a mechanical drive, during a return stroke. The mechanical drive is a continuously driven spindle drive including a driving motor. The spindle drive is automatically coupled to the movable part of the pump responsive to termination of the working stroke thereof, and is automatically uncoupled from the movable part of the pump responsive to the termination of the return stroke. In one embodiment of the invention, the spindle drive includes a stationary threaded spindle secured to the movable pump part and a split nut rotatable by the motor and movable into and out of threaded engagement with the spindle. A toggle or tilting lever mechanism effects engagement and disengagement of the split nut with the stationary spindle. In a second embodiment, the motor drives two rotatable threaded spindles having their axes in spaced parallel relation, and a connecting bar, having threads at each end, is connected to the movable part of the pump and is swung into and out of threaded engagement with the two spindles. The third embodiment also has two rotatable threaded spindles driven by the motor but cooperable with a split nut in the same manner as in the first embodiment.
Inventors
- 👤 K Wachter
- 👤 H Rabenecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:20
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
In a gas or dust detecting and measuring apparatus of the type including a bellows pump for drawing in a sample to be analyzed, with the bellows pump having a movable part and being expanded by the bias of a spring, during a working stroke, and collapsed by a mechanical drive, during a return stroke, an improved mechanical drive comprising, in combination, a continuously driven spindle drive including a drive means therefor; and means operable automatically, responsive to termination of the working stroke, under spring bias, of said bellows pump, to couple said spindle drive to said movable part to perform the return stroke and, responsive to termination of the return stroke, by said spindle drive, of said bellows, to uncouple said spindle drive from said movable part to condition said bellows pump to perform the working stroke under the spring bias.
Claim 2
Dependent Claim
142 words
In a gas or dust detecting and measuring apparatus of the type including a bellows pump for drawing in a sample to be analyzed, with the bellows pump having a movable part and being expanded by the bias of a spring, during a working stroke, and collapsed by a mechanical drive, during a return stroke, an improved mechanical drive comprising, in combination, a continuously driven spindle drive including a drive means therefor; and means operable automatically, responsive to termination of the working stroke, under spring bias, of said bellows pump, to couple said spindle drive to said movable part to perform the return stroke and, responsive to termination of the return stroke, by said spindle drive, of said bellows, to uncouple said spindle drive from said movable part to condition said bellows pump to perform the working stroke under the spring bias.
Claim 3
Dependent Claim
39 words
An improved mechanical drive, as claimed in claim 1, in which said continuously driven spindle drive comprises a threaded spindle fixedly secured to said movable part; said last-named means comprising means automatically engageable and disengageable with said threaded spindle.
Claim 4
Dependent Claim
27 words
An improved mechanical drive, as claimed in claim 2, in which said engageable and disengageable means comprises a split nut rotatable by said continuously driven spindle drive.
Claim 5
Dependent Claim
141 words
An improved mechanical drive, as claimed in claim 3, including a rotatable housing mounting said split nut while restraining said split nut against axial displacement; toggle lever mechanism mounted on said housing and connected to the relatively movable parts of said split nut; control means displaceably mounted on said housing and connected to said toggle lever mechanism to move the same between a first position, in which said split nut is engaged with said threaded spindle, and a second position, in which said split nut is disengaged from said threaded spindle; and actuating means movable with said threaded spindle and engageable with said control means at the end of the working stroke and at the end of the return stroke of said bellows pump to actuate said toggle mechanism to engage and disengage said split nut relative to said threaded spindle.
Claim 6
Dependent Claim
65 words
An improved mechanical drive, as claimed in claim 4, in which said actuating means comprises said movable part of said bellows pump and a control plate secured to said threaded spindle in axially spaced relation to said movable part of said bellows pump, said movable part of said bellows pump and said control plate being engageable with respective opposite ends of said displaceable control means.
Claim 7
Dependent Claim
120 words
An improved mechanical drive, as claimed in claim 5, in which there are a pair of toggle mechanisms; each toggle mechanism including a pair of tipping levers pivoted intermediate their ends on said housing and pivotally connected, adjacent a first end thereof, to the halves of said split nut, said displaceable control means comprising a pair of slides displaceable parallel to the axis of said threaded spindle and each having a respective elongated slot receiving a respective guide pivot; and stop pins on each slide engageable with the associated toggle levers to snap the associated toggle mechanism past the dead center point to move the two halves of the split nut into and out of engagement with said threaded spindle.
Claim 8
Dependent Claim
67 words
An improved mechanical drive, as claimed in claim 1, in which said spindle drive comprises a pair of rotatable threaded spindles rotatable about spaced parallel axes by said drive means; said automatically operable means comprising a component carried by said movable part of said bellow pumps and positioned between said threaded spindles; said component being simultaneously threadedly engageable with both spindles and simultaneously disengageable from both spindles.
Claim 9
Dependent Claim
44 words
An improved mechanical drive, as claimed in claim 7, in which said component forms a split nut; the threads of the two halves of the split nut being directed radially outwardly and each being engageable and disengageable relative to a respective rotatable threaded spindle.
Claim 10
Dependent Claim
67 words
An improved mechanical drive, as claimed in claim 8, including toggle lever mechanism engageable with the two halves of the split nut; control means displaceable parallel to said rotatable threaded spindles; and stops on said control means engageable with said toggle lever mechanism to displace said split nut halves simultaneously into engagement with respective rotatable threaded spindles and simultaneously out of engagement with respective rotatable threaded spindles.
Claim 11
Dependent Claim
102 words
An improved mechanical drive, as claimed in claim 7, in which said component movable with said movable part of said bellows pump comprises an elongated transversely extending member oscillatable about an axis parallel to the axes of said rotatable threaded spindles; each end of said member being formed with a thread engageable with the thread of a respective rotatable threaded spindle; said automatically operable means oscillating said member between a first position in which said threaded ends are threadedly engaged with respective rotatable threaded spindles and a second position in which said threaded ends are disengaged from the associated rotatable threaded spindles.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |