US3759106A - Gas or dust detecting and measuring apparatus - Google Patents

Gas or dust detecting and measuring apparatus Download PDF

Info

Publication number
US3759106A
US3759106A US00287220A US3759106DA US3759106A US 3759106 A US3759106 A US 3759106A US 00287220 A US00287220 A US 00287220A US 3759106D A US3759106D A US 3759106DA US 3759106 A US3759106 A US 3759106A
Authority
US
United States
Prior art keywords
spindle
drive
split nut
threaded
movable part
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
Application number
US00287220A
Other languages
English (en)
Inventor
K Wachter
H Rabenecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draegerwerk AG and Co KGaA
Original Assignee
Draegerwerk AG and Co KGaA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Draegerwerk AG and Co KGaA filed Critical Draegerwerk AG and Co KGaA
Application granted granted Critical
Publication of US3759106A publication Critical patent/US3759106A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices

Definitions

  • 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 amechanical drive, during a return stroke.
  • the mechanical drive is a continuously driven spindle drive including a driving m0- tor.
  • 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.
  • 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 ortilting lever mechanism effects engagement and disengagement of the split nut with the stationary spindle.
  • 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 nutin the same manner as in the first embodiment.
  • suction or drawing in device comprises a bellows or bellows pump which is expanded by a spring into its extended end position, the expansion or extension, effected by the spring bias, being used to draw in the conveying air.
  • the extension of the bellows can be limited by suitable bands or straps.
  • the bellows pump can be provided with only one outlet valve, and
  • the air resistance of the suction port is greater than the resistance of the outlet port.
  • a known spring-loaded gas-detecting hand pump As an air conveyor, there can be used a known spring-loaded gas-detecting hand pump.
  • a pressure measuring member such as a pressure cell, which shuts off the drive at an underpressure on the suction side of the pump while it starts the drive at normal pressure, on the suction side of the pump.
  • a pressure measuring member such as a pressure cell
  • a pressure measuring member is connected to the pressure side of the bellows pump, and shuts off the drive at an overpressure on the outlet side of the pump while starting the drive at normal pressure on the outlet side of the pump.
  • a break contact controlled by a pressure cell arranged on the suction side of the bellows pump, can be connected into the circuit of an electric drive, this break contact being opened at an underpressure on the suction side of the pump and closed at normal pressure on the suction side of the ump.
  • the invention is directed to the problem of providing a gas or dust detecting and measuring apparatus which has a mechanically driven air conveyor in the form of a bellows pump, whose drive is simple in design and operation, and which has a low power consumption. More particularly, the invention is directed to such a detecting and measuring apparatus having a bellows pump whose working stroke is produced by spring force and whose return stroke is produced by a mechanical drive.
  • the mechanical drive is a continuously driven spindle drive 'which is connected, for engagement and disengagement, with the moving'part of the bellows pump in such a way that the drive disengages automatically at the end of the retumor tension stroke of the bellows pump and engages automatically at the end of the working stroke of the pump.
  • the invention arrangement has the advantage of tionary spindle, preferably threaded, on which there actsa continuously driven engageable and disengageable component.
  • the engageable and disengageable component can bedesigned in various ways. In a simple design, this component is a split lock nut.
  • the split nut can be mounted rotatably in a housing but restrained 1 against axial displacement, and can be provided with a toggle or tilting or tipping'lever-type lock by means of which the split nut is forced into one of its two terminal positions. Stops are provided which act on the control means of the toggle or tipping lever in the two positions to the outside and being engageable and disengageable withrespect to a respective one of the two spindles.
  • the lock or split nut type of engageable and disengageable component can be provided with a tipping or toggle lever-type lock by means of which the split nut is forced into one or the other of its two positions, stops being provided to act on the control means of the toggle or tipping levertype lock in each position of the lock nut.
  • the moving front plate of the bellows pump is provided with a pressure plate arranged between the two spindles and turning about an axis parallel to the axes of the spindles. This pressure plate is provided, at both opposite ends, with a thread corresponding to the spindle threads, and with a control device which moves the pressure plate automatically between the engaged and disengaged positions in dependence on the end position of the front plate.
  • An object of the invention is to provide a gas or dust detecting and measuring apparatus with a mechanically driven air conveyor whose drive is simple in design and operation and which has a low power consumption.
  • Another object of the invention is to provide such an apparatus in which a bellows pump is moved through a working stroke by spring force and is moved in a return stroke by a mechanical drive.
  • a further object of the invention is to provide such an apparatus in which the mechanical drive is a continuously driven spindle drive arranged for engagement and disengagement relative to a moving part of the bellows pump.
  • Another object of the invention is to provide such an apparatus in which the drive is disengaged automatically at the end of the return stroke of the bellows pump and is engaged automatically at the end of the working stroke of the bellows pump.
  • FIG. 1 is a side elevation view, partly in section, of one embodiment of a gas or dust detecting and measuring apparatus in accordance with the invention
  • FIGS. 2a and 2b are sections on the plane A-A of FIG. 1, taken through the lock nut, with FIG. 2a illustrating the lock nut in the open position and FIG. 2b illustrating the lock or split nut in the closed position;
  • FIGS. 3a and 3b are elevations of that part of FIG. 1 outlined in broken lines, namely the lock nut, with FIG. 3a illustrating the open position and FIG. 3b illustrating the closed position;
  • FIG. 4 is an elevation view, partly in section, of another embodiment of the invention.
  • FIG. 5 is an enlarged detail view of that portion of FIG. 4 outlined in broken lines;
  • FIGS. 6 and 7 are sections on the line B-B of FIG. 4, with FIG. 6 illustrating the engaged position and FIG. 7 illustrating the disengaged position;
  • FIG. 8 is a sectional view on the line BB of FIG. 4 wherein a pressure plate is replaced by a split nut member;
  • FIG. 9 is a top plan view of FIG. 8 illustrating both positions of the split-nut type part.
  • a casing 1 contains the bellows 2 of a bellows pump which is connected to the intake 3 to receive a test tube 4.
  • a relief valve 6 In the front face 5 of the bellows, which is also the front face of casing 1, there is arranged a relief valve 6.
  • Bellows 2 is tensioned or expanded by a spring 7 which bears between front wall or face 5 and movable end wall or face 8 of the bellows.
  • Movable end wall 8 of the bellows has secured thereon a threaded spindle 9 which is engageable by the split lock nut 10.
  • Nut 10 is mounted in a bearing 11 of which only the parts 11a and 11b are illustrated in FIGS. 30 and 3b.
  • Bearing l1 prevents axial displacement of nut 10, which otherwise can turn freely about spindle 9.
  • Nut 10 is formed with a gear rim l2 meshing with a pinion l3 ofa driving spindle 14 having a driving gear 15 secured to its opposite end and meshing with the output pinion 16 of a driving motor 17.
  • Lock or split nut 10 comprises substantially a housing 18 in which two pistons 19 are mounted for displacement transversely of the axis of rotation of nut 10. Pistons 19 are provided with guide pins 20 which project to the exterior through corresponding slots in housing 18. Journals 22 are secured on housing 18 and serve to support adjusting levers 23 formed with oblong slots 24 receiving pins 20. Levers 26 are pivotally mounted at their opposite ends on a common supporting stud 28 secured on housing 18. In effect, the combination of levers 23 and 26 constitutes a toggle joint, there being one of these toggle joints on either side of spindle 9.
  • a distributing slide member 29 comprising two circular cross-section parts 29a and 29b which are interconnected with each other, at their end faces, by annular members 30 and 31. These members surround housing 18 with play, and slide member 29 carries, on each side, four control pins 32 by means of which tilting levers 26 are pivoted.
  • FIGS. 2a and 3a illustrate nut 10 in the open position.
  • Bellows 2 extends in the direction of the arrow P and finally its movable end face 8 strikes against ring surface 31 of slide member 29.
  • pins 32 are moved upwardly and the pairs of tilting levers 26, on opposite sides of spindle 9, are pivoted from the position shown in FIG. 3, under the action of spring 27, be-
  • pistons 19 are moved into the closed position of nut 10 through levers 23 and pins 20.
  • the inner end faces of pistons 19 are provided with threads 19a which correspond to the thread of spindle 9.
  • FIGS. 4 through 7 differ from that shown in FIGS. 1 through 3b in that driving motor 17 has a pinion 33 meshing with two spur gears 34, each secured to a respective rotatable threaded spindle 35, spindles 35 having their axes in spaced parallel relation to each other.
  • a pressure member or shaft 36 is secured to movable end wall 8 of bellows 2, and terminates in a cross member 37.
  • Member 37 is mounted for rotation about the axis of pressure shaft 36, and is provided, at its opposite ends 38, with threads corresponding to the threads of rotatable spindles 35.
  • FIG. 6 illustrates member 37 in the spindle engaging position
  • FIG. 7 illustrates this member in the spindle disengaging position. Engagement and disengagement are effected by a device which has not been illustrated.
  • FIG. 4 illustrates the apparatus with member 37 in the engaging position during the return stroke of the bellows, and in which the opposite ends 38 of member 37 threadedly engage the respective driving spindles 35.
  • Bellows 2 is compressed through pressure member 36.
  • member 37 is rotated through 90 by a control device, which has not been shown, from the position represented in FIG. 6 into the position represented in FIG. 7.
  • End wall 8 of bellows 2 is thus disconnected from the spindles 35, and the bellows performs its suction stroke under the bias of spring 7.
  • member 37 is again brought into engagement with spindles 35, as shown in FIG. 6, by a control device which has not been shown.
  • FIGS. 8 and 9 illustrate an embodiment of theinvention which corresponds, with respect to the driving spindles 35, to the embodiment of the invention shown in FIG. 4'but, with respect to the engageable and disengageable component, to the embodiment shown .in FIGS. 2a 3b.
  • Spindles 35 are mounted in the opposite ends of a housing 40, which is illustrated broken off at both ends so that the bearings are visible.
  • Housing 40 has a center part 41 which is provided, on both sides, with an opening, the inwardly directed end faces 42 of the housing walls being formed with guide grooves 43 for the lock housing members 44.
  • lock housing members-44 there are mounted, for lateral displacement, two pistons 45 and 46 designed in the same manner as the pistons of thesplit nut shown in FIGS. 2a 3b.
  • the controls of this lock also correspond to that of the lock shown in FIGS. 2a 3b, so that reference can be made to the description of FIGS. 2a 3b.
  • 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 bins, 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 spindledrive from said movable part to condition said bellows pump to perform the working stroke under the spring bias.
  • 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.
  • An improved mechanical drive 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.
  • 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.
  • each toggle mechanism including apair 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 displaceablecontrol 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.
  • 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.
  • An improved mechanical drive 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.
  • 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.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Reciprocating Pumps (AREA)
  • Sampling And Sample Adjustment (AREA)
US00287220A 1971-09-16 1972-09-08 Gas or dust detecting and measuring apparatus Expired - Lifetime US3759106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2146248A DE2146248C3 (de) 1971-09-16 1971-09-16 Gasspür- bzw. Staubspür- und -meßgerät

Publications (1)

Publication Number Publication Date
US3759106A true US3759106A (en) 1973-09-18

Family

ID=5819707

Family Applications (1)

Application Number Title Priority Date Filing Date
US00287220A Expired - Lifetime US3759106A (en) 1971-09-16 1972-09-08 Gas or dust detecting and measuring apparatus

Country Status (4)

Country Link
US (1) US3759106A (enrdf_load_stackoverflow)
JP (1) JPS4857692A (enrdf_load_stackoverflow)
DE (1) DE2146248C3 (enrdf_load_stackoverflow)
GB (1) GB1344430A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4338826A (en) * 1980-09-11 1982-07-13 Air Test Labs, Inc. Sampling apparatus
US4947696A (en) * 1988-06-30 1990-08-14 Dragerwerk Aktiengesellschaft Bellow pump for gas test tube
US4984476A (en) * 1988-10-21 1991-01-15 Auergesellschaft Gmbh Air conveyor for gas-sampling tubes
US20140325746A1 (en) * 2011-12-01 2014-11-06 Femmed, Inc. Fluid voiding apparatus with vacuum device
US9568399B2 (en) 2011-12-28 2017-02-14 Nextteq Llc Sampling device
US20240224468A1 (en) * 2022-12-29 2024-07-04 Wiwynn Corporation Immersion cooling system and delivery device thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2892847A1 (en) * 2011-12-28 2013-07-04 Nextteq Llc Sample bags with multilayer walls

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645940A (en) * 1952-05-14 1953-07-21 Atomic Energy Commission Snap sampler
US3238783A (en) * 1962-09-07 1966-03-08 Nat Res Dev Breath sampling apparatus
US3422681A (en) * 1966-06-14 1969-01-21 Atomic Energy Commission Vehicle actuated roadside air sampling device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645940A (en) * 1952-05-14 1953-07-21 Atomic Energy Commission Snap sampler
US3238783A (en) * 1962-09-07 1966-03-08 Nat Res Dev Breath sampling apparatus
US3422681A (en) * 1966-06-14 1969-01-21 Atomic Energy Commission Vehicle actuated roadside air sampling device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4338826A (en) * 1980-09-11 1982-07-13 Air Test Labs, Inc. Sampling apparatus
US4947696A (en) * 1988-06-30 1990-08-14 Dragerwerk Aktiengesellschaft Bellow pump for gas test tube
US4984476A (en) * 1988-10-21 1991-01-15 Auergesellschaft Gmbh Air conveyor for gas-sampling tubes
US20140325746A1 (en) * 2011-12-01 2014-11-06 Femmed, Inc. Fluid voiding apparatus with vacuum device
US9568399B2 (en) 2011-12-28 2017-02-14 Nextteq Llc Sampling device
US10359341B2 (en) 2011-12-28 2019-07-23 Nextteq Llc Sampling device
US20240224468A1 (en) * 2022-12-29 2024-07-04 Wiwynn Corporation Immersion cooling system and delivery device thereof

Also Published As

Publication number Publication date
GB1344430A (en) 1974-01-23
DE2146248A1 (de) 1973-03-22
DE2146248B2 (de) 1979-09-20
JPS4857692A (enrdf_load_stackoverflow) 1973-08-13
DE2146248C3 (de) 1980-06-26

Similar Documents

Publication Publication Date Title
US3759106A (en) Gas or dust detecting and measuring apparatus
GB1268937A (en) Fluid transfer valve structure
US4013264A (en) Flow control valve with isolated sequence control mechanism
US2893324A (en) Pumps
CN115957985B (zh) 一种航空航天发动机燃油喷嘴密封性检测设备
US2908182A (en) Valve operator
CN112903212B (zh) 一种奶粉检测装置
US2783645A (en) Torque meter
US3824877A (en) Indexing workpiece supporting apparatus
CN208629001U (zh) 一种板件加工的导向装置
US2425720A (en) Compound meter
US4048864A (en) Drive with continuously adjustable speed variation
US2585376A (en) Profile grinding or polishing machine
CN115869815B (zh) 采血管血液混匀装置
CN209112825U (zh) 一种料斗蝶阀开启结构
CN210305997U (zh) 一种便携式管件切割装置
US2788672A (en) Mechanism for imparting rotary motion to index tables and the like
US2788673A (en) Mechanism for imparting rotary motion to index tables and the like
CN108326352B (zh) 一种五金铜皮生产传送定位截断标记设备
CN107941504B (zh) 产品使用寿命的测试装置
CN220094391U (zh) 一种针对大型钢结构构件的翻身转胎结构
US2089711A (en) Floating operator for variable speed drives
CN111974705A (zh) 一种包装盒四面破损检验筛选装置
US2116456A (en) Air governor
US2531992A (en) Speed change power transmission