US72820A - Improvement in air-pumps - Google Patents
Improvement in air-pumps Download PDFInfo
- Publication number
- US72820A US72820A US72820DA US72820A US 72820 A US72820 A US 72820A US 72820D A US72820D A US 72820DA US 72820 A US72820 A US 72820A
- Authority
- US
- United States
- Prior art keywords
- piston
- cylinder
- air
- valve
- pumps
- 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
Links
- 239000007789 gas Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 229910001369 Brass Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 240000001439 Opuntia Species 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000284 resting Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/14—Pumps characterised by muscle-power operation
Definitions
- Figure I is a longitudinal section of the pump.
- Fig. II is a cross sectionA on line A B.
- Fig. III is a plan, with cylinder in section, showing the piston at end of outward stroke.
- FIG. F in Figs. I and III, is the cylinder of the pump, made of cast-iron, or any other suitable material.
- a frame or bed-plate, G is secured to the front end of the cylinder F, said frame containing the slides for cross-head and box for crank-shaft.
- the piston C provided with a suitable packing, reciprocates in the cylinder in the usual manner by means of piston-rod, connectingrod, and crank, and may be driven by a belt and pulley, or gearing, or a direct attachment of any motor.
- the piston O is provided with inlet-valves a, a, (four or more or less in num' ber, according to size,) which are kept closely to their seats by suitable or springs of rubber or other suitable material. These valves, when closed, form a plain smooth surface with the front end of the piston.
Description
ETTD STATES PATENT OEEIOE.
TEOMAs DOANE, OE BOSTON, MASSACHUSETTS.
IMPROVEMENT lNAlR-PUMPS.
Specification forming part of Letters Patent No. 72,820, dated December 31, 1867.
To all whom it may concern:
- Be it known that I, THOMAS DOANE, of Boston, in the county of Suffolk and Gommonwealth of Massachusetts, have invented a new the working-piston to travel closely up to the outlet-valve, and even to lift it from its seat, thus discharging'every particle of air or gas in the cylinder, making the pump more effectual in its operation.
lf, as heretofore done, a head containing` both inlet and outlet valves is screwed solid against the end of the cylinder, then the workingpiston cannot discharge all the air or gas, or other iiuid, because sufficient allowance has to be made for expansion vand contraction for diii'erent tempera-tures, as also, and mainly, for the wear of connecting-rod pins and journals. The smallest quantity of air or gas remaining in the cylinder' will greatly diminish the effect of the pumps.
To enable others skilled in the arts to make and use my invention, I will proceed to describe its construction and operation with reference to the accompanying drawings, and letters of reference marked thereon.
Figure I is a longitudinal section of the pump. Fig. II is a cross sectionA on line A B. Fig. III is a plan, with cylinder in section, showing the piston at end of outward stroke.
F, in Figs. I and III, is the cylinder of the pump, made of cast-iron, or any other suitable material. A frame or bed-plate, G, is secured to the front end of the cylinder F, said frame containing the slides for cross-head and box for crank-shaft.
The piston C, provided with a suitable packing, reciprocates in the cylinder in the usual manner by means of piston-rod, connectingrod, and crank, and may be driven by a belt and pulley, or gearing, or a direct attachment of any motor. The piston O is provided with inlet-valves a, a, (four or more or less in num' ber, according to size,) which are kept closely to their seats by suitable or springs of rubber or other suitable material. These valves, when closed, form a plain smooth surface with the front end of the piston.
The cylinder- F is furnished with a head, H, and discharge-pipe, I, which at the same time form a receptacle for the outlet-valve D, made of brass or any other suitable material, and
provided with a stem, E, which 'guides the valve in the bearings c c of the dischargepipe I. The end of the stem E is provided with a spiral spring, b, or any other suitable spring, which, resting against the small cover K, acts against the Washer c on the stem E.,
and keeps the valve D to its seat with a inoderate pressure.
The operation of my improved pump is as follows: At the outward stroke of the piston, in direction of the arrow L, Fig. I, the inlet-valves a. a will admit the air or gases to the interior of the cylinder. At the end of the outward stroke these valves a a will gently close by means of the springs d d. At the return stroke of the piston, and after the pressure of the compressed air or gases has become sufficient-ly strong to overcome the resistance of the spring b, and whatever resistance there may be resulting from the pressure in the receiver into which the air or gases may be forced, acting on the back side of the outlet-valve D, the valve D will open and permit the compressed gases to escape, and, as shown in Fig. III, the piston C will travel beyond the end of the cylinder, taking the valve D upon and with itself by reason of the yielding of the spring l), thus discharging the entire contents of the cylinder. At the return stroke ofthe piston the valve D Will follow it back to its seat, and an immediate vacuum will be produced as the piston leaves the valve, which vacuum will again be supplied through the valves c a, as above described.
What I claim as my invention, and desire to secure by Letters Patent, is
- The eduction-valve D, arranged to yield and operate substantially as described, in combi` nation with a piston, C, and cylinder, F.
THOMAS DOANE. Witnesses:
G. W. LUNT, CEAS. S. LINCOLN.
spiral springs d d,
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US72820A true US72820A (en) | 1867-12-31 |
Family
ID=2142330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US72820D Expired - Lifetime US72820A (en) | Improvement in air-pumps |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US72820A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2442631A (en) * | 1944-11-30 | 1948-06-01 | Bendix Aviat Corp | Pump |
-
0
- US US72820D patent/US72820A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2442631A (en) * | 1944-11-30 | 1948-06-01 | Bendix Aviat Corp | Pump |
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