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Peristaltic pumpRelated Patent Categories: Pumps, Expansible Chamber Type, Elongated Flexible Chamber Wall Progressively Deformed, Deformation By Rolling Or Sliding Engagement Member, Plural Spaced Engagement Members Or Member PortionsPeristaltic pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070031272, Peristaltic pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to peristaltic pumps, in particular to a small pump for dispensing liquid detergent into a dish washing machine. [0003] 2. Discussion of the Prior Art [0004] Peristaltic pumps are well known in the prior art and may be defined as pumps which produce pulse-like contractions that propel matter along inside a tube. [0005] In FIG. 1, there is shown a prior art device that was manufactured by Knight Equipment International, Inc., of Costa Mesa, California, now Knight, Inc. of Northbrook, Ill. [0006] Inside a casing 10, there is a pump 12 in which a triangular rotor 14 rotates to compress a flexible rubber tube 16 against a curved wall 30 at points A and B. These points A and B change along the length of the tube 16 as the rotor 14 rotates around its central axis 18. Three pins 20 hold three rollers 22 at tips X, Y and Z of the rotor 14 while four screws 24 hold front and back portions of the casing 10 together. The tube 16 has an inlet suction branch 16C and an outlet delivery branch 16D. Arrows I and O indicate the direction of flow of liquid detergent into and out of the tube 16. A clear, hard plastic cover 26 with a tab 28 allows a user to view and to have access to the interior of the casing 10 in order to replace or repair any parts of the pump 12 and the rotor 14 which may break. [0007] One disadvantage of this prior art device is that the constant vibration of an industrial washing machine in which it is used tends over time to cause the screws 24 to work loose from the casing 10, thus causing the pump 12 inside to fail. Also, the constant vibration causes the pins 20 holding the rollers 22 in the rotor 14 to work loose and push up against the cover 26 until the cover 26 pops off. Once again the pump 12 fails. Thus, it is a problem in the prior art to develop a peristaltic pump which is resistant to constant vibrations that eventually caused earlier devices to become loose and fail. SUMMARY OF THE INVENTION [0008] The invention may be summarized as a small screwless peristaltic pump which is resistant to constant vibrations caused by a machine to which it is attached so that the pump does not become loose and fall apart. [0009] A primary object of the invention is to hold the pump together without screws when the pump is used in low torque and low vibration operations. [0010] A secondary object of the invention is to support a motor onto a rear casing portion of the housing. [0011] A tertiary object of the invention is to make the pump, its internal rollers and a flexible tube impervious to deleterious ingredients contained in liquid detergent. [0012] A key advantage of the present invention is that only a predetermined amount of the liquid detergent enters the pump because the synchronous motor, as controlled electronically, meters the detergent to prevent waste in the dish washing machine. BRIEF DESCRIPTION OF THE DRAWINGS [0013] The invention and its other advantages may be best understood by reference to the accompanying drawings and the subsequent detailed description of the preferred embodiments. [0014] FIG. 1 is a front elevational view of a known prior art device. [0015] FIG. 2 is an exploded front perspective view of a first embodiment of the invention. [0016] FIG. 3 is an exploded front perspective view of a rotor and rollers inside the first embodiment. [0017] FIG. 4 is a top end view of a front portion of a casing of the first embodiment. [0018] FIG. 5 is a front inside elevational view of a back portion of the casing of the first embodiment. [0019] FIG. 6 is an assembled perspective view of the first embodiment. [0020] FIG. 7 is an exploded rear perspective view of a second embodiment of the invention. [0021] FIG. 8 is an exploded front perspective view of a rotor and rollers inside the second embodiment. Continue reading about Peristaltic pump... Full patent description for Peristaltic pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Peristaltic pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Peristaltic pump or other areas of interest. ### Previous Patent Application: Effervescent gas bleeder apparatus Next Patent Application: Flexible tube for supplying chemical Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Peristaltic pump patent info. IP-related news and info Results in 0.12 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , 174 |
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