EP0687814A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Plunger pump
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1995-04-12
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Granted: —
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Expires: 2015-04-12
Abstract
Abstract Plunger pump which has reduced noise and vibration and has a plunger case having increased durability. It has an eccentric drive shaft (3) and at least one plunger (4,5) kept in abutment with the eccentric drive shaft (3) and adapted to be driven to produce fluid pressure when the eccentric drive shaft (3) is rotated. The axis of the plunger (4,5) is offset by a predetermined distance from the center of rotation of the eccentric drive shaft (3) in a direction perpendicular to the axis of the plunger.
Inventors
- 👤 Koji C/O Itami Works Takata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:41
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4031; F; F04; F04B; F04B19/00; F04B19/04; F04B1/00; F04B1/04; F04B1/0404; F04B1/0408; F04B1/0421; F04B9/00; F04B9/02; F04B9/04; F04B9/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A plunger pump comprising an eccentric drive shaft and at least one plunger kept in abutment with said eccentric drive shaft and adapted to be driven to produce fluid pressure when said eccentric drive shaft is rotated, characterized in that the axis of said plunger is offset by a predetermined distance from the center of rotation of said eccentric drive shaft in a direction perpendicular to the axis of said plunger.
Claim 2
Dependent Claim
25 words
A plunger pump as claimed in claim 1 wherein said predetermined distance is e /2, wherein e is the eccentricity of said eccentric drive shaft.
Claim 3
Dependent Claim
27 words
A plunger pump as claimed in claim 1 wherein said predetermined distance is 2 e /π , wherein e is the eccentricity of said eccentric drive shaft.
Claim 4
Dependent Claim
77 words
A plunger pump as claimed in claim 1 further comprising a second plunger provided on a diametrically opposite side of said eccentric drive shaft from said at least one plunger and kept in abutment with said eccentric drive shaft, the axes of said plungers being offset by predetermined distances from said center of rotation of said eccentric drive shaft to one side from which said plungers meet said eccentric drive shaft when said eccentric drive shaft rotates.
Claim 5
Dependent Claim
24 words
A plunger pump as claimed in claim 4 wherein said predetermined distance for one plunger is substantially equal to that for the other plunger.
Claim 6
Dependent Claim
25 words
A plunger pump as claimed in claim 5 wherein said predetermined distance is e /2, wherein e is the eccentricity of said eccentric drive shaft.
Claim 7
Dependent Claim
27 words
A plunger pump as claimed in claim 5 wherein said predetermined distance is 2 e /π , wherein e is the eccentricity of said eccentric drive shaft.
Claim 8
Dependent Claim
22 words
A plunger pump as claimed in any of claims 1-7 wherein said plunger has at least one end tapered to reduced diameter.
Claim 9
Dependent Claim
27 words
A plunger pump as claimed in any of claims 1-7 wherein a plunger case in which said plunger is slidably mounted is beveled at near its opening.
Claim 10
Dependent Claim
47 words
A plunger pump comprising an eccentric shaft and at least one plunger kept in abutment with said eccentric drive shaft and adapted to be driven to produce fluid pressure when said eccentric drive shaft is rotated, said plunger having at least one end tapered to reduced diameter.
Claim 11
Dependent Claim
53 words
A plunger pump comprising an eccentric shaft and at least one plunger kept in abutment with said eccentric drive shaft and adapted to be driven to produce fluid pressure when said eccentric drive shaft is rotated, wherein a plunger case in which said plunger is slidably mounted is beveled at near its opening.
References Cited (Backward Citations)
No citation records indexed.
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