US3854629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ejecting device
Assignee: Individual
•
Filing: 1973-06-07
•
Granted: 1974-12-17
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Expires: 1993-06-07
Abstract
Abstract A piston is reciprocable in a cylinder between a suction position and an expulsion position, and a drive is provided for reciprocating the piston. The drive includes a speed regulating arrangement which can be used to make the piston move faster during its retraction from the expulsion position to the suction position than vice versa.
Inventors
- 👤 R Blieberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:49
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/01; B05C17/0103
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
154 words
A device of the character described, comprising a cylinder having an interior at least partially filled with a substance to be expelled; a piston mounted in said interior of said cylinder for reciprocation with respect thereto between a plurality of positions delimited by a forward position and a retracted position and adapted to expel the substance from said interior of said cylinder during its movement toward said forward position and to draw a medium into said interior of said cylinder during its movement toward said retracted position; nozzle means connected to said cylinder and communicating with said interior thereof for dispensing the substance expelled therefrom; drive means for reciprocating said piston; and retracting means for limited retraction of said piston toward said retracted position subsequently to the termination of each movement toward said forward position to thereby retract the substance present in said nozzle means into said interior of said cylinder and prevent dripping.
Claim 2
Independent Claim
154 words
A device of the character described, comprising a cylinder having an interior at least partially filled with a substance to be expelled; a piston mounted in said interior of said cylinder for reciprocation with respect thereto between a plurality of positions delimited by a forward position and a retracted position and adapted to expel the substance from said interior of said cylinder during its movement toward said forward position and to draw a medium into said interior of said cylinder during its movement toward said retracted position; nozzle means connected to said cylinder and communicating with said interior thereof for dispensing the substance expelled therefrom; drive means for reciprocating said piston; and retracting means for limited retraction of said piston toward said retracted position subsequently to the termination of each movement toward said forward position to thereby retract the substance present in said nozzle means into said interior of said cylinder and prevent dripping.
Claim 3
Dependent Claim
44 words
A device as defined in claim 1, and further comprising speed regulating means operable for moving said piston toward said forward position at a first speed and for moving said piston toward said retracted position at a second speed higher than said first speed.
Claim 4
Dependent Claim
36 words
A device as defined in claim 1, wherein said drive means further comprises an electromotor having a torque which is self-adjusting in dependence upon the resistance encountered by said piston during movement to said forward position.
Claim 5
Dependent Claim
35 words
A device as defined in claim 1; and further comprising switching means for controlling movement of said piston between said positions thereof, and for stopping and starting said drive means in dependence upon such movements.
Claim 6
Dependent Claim
20 words
A device as defined in claim 1, said retracting means comprising regulating means for regulating the extent of such retraction.
Claim 7
Dependent Claim
25 words
A device as defined in claim 1, wherein said retracting means comprises an arrangement for retracting said piston by between substantially 1 and 5 cm.
Claim 8
Dependent Claim
27 words
A device as defined in claim 1; said nozzle means comprising an ejection nozzle; and further comprising mounting means mounting said nozzle for ready removal and installation.
Claim 9
Dependent Claim
41 words
A device as defined in claim 1; further comprising a housing; wherein said drive means comprises an electromotor in said housing; and wherein said speed regulating means is mounted on an upper side of said housing which is opposite said electromotor.
Claim 10
Dependent Claim
43 words
A device as defined in claim 1; further comprising a housing having a pistol grip; and switch means in said pistol grip for engagement by the hand of a user and associated with said drive means for controlling the operation of the same.
Claim 11
Dependent Claim
39 words
A device as defined in claim 1; further comprising a housing; and said piston having a piston rod which extends in part from said housing; and cover means covering the region where said piston rod extends from said housing.
Claim 12
Dependent Claim
58 words
A device as defined in claim 10, wherein said piston rod extends from said housing to a variable extent depending upon the position of said piston; and wherein said cover means surrounds said piston rod exteriorly of said housing and is extensible and retractable in dependence upon the extent to which said piston rod extends from said housing.
Claim 13
Dependent Claim
36 words
A device as defined in claim 1; further comprising a housing; and an electronic control unit for controlling the operation of said drive means, said control unit having a casing which is unitary with said housing.
Claim 14
Dependent Claim
45 words
A device as defined in claim 1; further comprising a housing having a handgrip portion; said piston having a piston rod; and said drive means including an electromotor adjacent said piston rod outside said handgrip portion and operative for effecting reciprocation of said piston rod.
Claim 15
Dependent Claim
34 words
A device as defined in claim 13, said drive means further comprising a gear drive including a gear surrounding said piston rod, and helical threads on said piston rod and meshing with said gear.
Claim 16
Dependent Claim
46 words
A device as defined in claim 1; further comprising a housing having one end region provided with a handgrip portion, and an opposite end region provided with said nozzle means; and wherein said drive means comprises an electromotor mounted in said housing intermediate said end regions.
Claim 17
Dependent Claim
36 words
A device as defined in claim 15; further comprising limit switches arranged in said handgrip portion and positioned so as to be operated in dependence upon reciprocatory movement of said piston to the respective position thereof.
Claim 18
Dependent Claim
28 words
A device as defined in claim 1; further comprising a housing having a pistol grip poRtion and being at least in part composed of two connected shell sections.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |