US3851801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispensing device having lost motion piston pump
Assignee: Involvo AG
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Filing: 1972-02-11
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Granted: 1974-12-03
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Expires: 1992-02-11
Abstract
Abstract A piston rod extends longitudinally through a chamber of a cylinder which is provided in one end wall with a dispensing nozzle. A piston surrounds and is slidable along the piston rod between a forward position expelling matter through the nozzle, and a retracted position. One or more passages are provided in the piston and/or the piston rod and these passages connect opposite axial ends of the piston but are open only when the piston is in the forward position. A supply of material to be dispensed communicates with the chamber rearwardly of the piston.
Inventors
- 👤 O Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:20
CPC Classifications
B; B05; B05B; B05B9/00; B05B9/01; B05B9/002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
219 words
A dispensing device, particularly for applying a bonding agent, comprising cylinder means having an elongated internal chamber provided with two end walls; dispensing nozzle means having a nozzle passage communicating with said chamber at one of said end walls; a piston rod extending longitudinally through said chamber; a piston surrounding said piston rod and slidable part of the distance between a first and a second position together with said piston rod and part of the distance relative to said piston rod, said piston dividing said chamber into two compartments located at opposite axial sides of the piston; passage means which is open and connects said compartments when said piston slides relative to said piston rod in one direction until said piston is in said first position, and closed when said piston rod and piston slide relative to one another in an opposite direction until said piston is in said second position; supply means communicating with said chamber intermediate said piston and the other of said end walls for supplying material to be dispensed; and valve means interposed in said nozzle passage, including a valve body responsive to the pressure of material resulting from movement of said piston toward said second position for opening said nozzle passage, and a biasing spring urging said valve body to normally close said passage.
Claim 2
Dependent Claim
219 words
A dispensing device, particularly for applying a bonding agent, comprising cylinder means having an elongated internal chamber provided with two end walls; dispensing nozzle means having a nozzle passage communicating with said chamber at one of said end walls; a piston rod extending longitudinally through said chamber; a piston surrounding said piston rod and slidable part of the distance between a first and a second position together with said piston rod and part of the distance relative to said piston rod, said piston dividing said chamber into two compartments located at opposite axial sides of the piston; passage means which is open and connects said compartments when said piston slides relative to said piston rod in one direction until said piston is in said first position, and closed when said piston rod and piston slide relative to one another in an opposite direction until said piston is in said second position; supply means communicating with said chamber intermediate said piston and the other of said end walls for supplying material to be dispensed; and valve means interposed in said nozzle passage, including a valve body responsive to the pressure of material resulting from movement of said piston toward said second position for opening said nozzle passage, and a biasing spring urging said valve body to normally close said passage.
Claim 3
Dependent Claim
23 words
A dispensing device as defined in claim 1, said passage means being provided in at least one of said piston rod and piston.
Claim 4
Dependent Claim
16 words
A dispensing device as defined in claim 1, said passage means being provided in said piston.
Claim 5
Dependent Claim
31 words
A dispensing device as defined in claim 1, wherein said passage means is provided in at least one of said piston rod and piston and comprises at least one passage therein.
Claim 6
Dependent Claim
93 words
A dispensing device as defined in claim 1, said piston rod having a front portion closer to and an other portion farther from said one end wall, said other portion being provided with a conical bead; and wherein said piston has a central bore having a cylindrical first section surrounding said front Portion and a conically diverging second section facing said bead, said passage means being provided in said piston and communicating with said second section, and said bead being seated in said second section when said piston is in said retracted position.
Claim 7
Dependent Claim
17 words
A dispensing device as defined in claim 5, wherein said passage means comprises a plurality of passages.
Claim 8
Dependent Claim
47 words
A dispensing device as defined in claim 1, said piston rod comprising a portion which extends out of said chamber and axially into an additional cylinder; and further comprising a double-acting pneumatic piston provided in said additional chamber and fast with said portion of said piston rod.
Claim 9
Dependent Claim
70 words
A dispensing device as defined in claim 7, said portion being axially shiftable in said additional cylinder and having a free end; and further comprising an adjusting screw adapted to extend into said additional cylinder to a selectable extend and projecting axially towards said free end so as to contact the same in response to axial shifting of said portion and to selectably limit the extent of such axial shifting.
Claim 10
Dependent Claim
29 words
A dispensing device as defined in claim 1; further comprising path-defining means defining a flow path for material to be dispensed and connecting said supply means with said cylinder.
Claim 11
Dependent Claim
34 words
A dispensing device as defined in claim 9, wherein said path-defining means is at least in part of thermally conductive material and in thermally conducting contact with said supply means and with said cylinder.
Claim 12
Dependent Claim
21 words
A dispensing device as defined in claim 10; and further comprising heating means for heating said material in said dispensing device.
Claim 13
Dependent Claim
22 words
A dispensing device as defined in claim 9; further comprising filter means in said path-defining means for filtering of material passing therethrough.
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |