US3677598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syphon lifting device having piston actuated venting valve
Assignee: Demay AG
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Filing: 1970-04-21
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Granted: 1972-07-18
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Expires: 1990-04-21
Abstract
Abstract A syphon for lifting solid articles includes a piston which is guided within a cylinder on a centrally arranged upstanding guide member and it is connected to a rod portion having means for connecting the device to a hoisting unit. A rolling diaphragm is connected from the upper end of the piston to an intermediate annular wall portion of the cylinder so that upward movement of the piston creates a vacuum in the space therebelow which is communicated through a conduit to a sealing area defined below a suction plate. The plate may be guided into association with an article to be lifted by a handle and the interior of the cylinder may be vented by a hand operated valve control which will open the lower portion of the cylinder to the atmosphere only when the piston has been lowered so as to permit actuation of the valve control.
Inventors
- 👤 Klaus Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:14
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0218; B66C1/0256
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
A syphon, comprising a cylinder, a piston movable in said cylinder having a rod portion adapted to be connected to a lifting device and being movable toward one end of said cylinder to create a suction on the opposite end, a suction member carried by said cylinder and having a suction space which is adapted to be connected to the vacuum of said cylinder for establishing suction engagement of an article, venting valve means connected to said suction space for venting said space, actuating means connected to said venting valve means and settable by said piston when said piston is at a predetermined position to open said valve means and vent said suction member suction space, said venting valve means including a line connecting said cylinder from the side having the vacuum to said suction space, a valve in said line having a movable valve portion with a cam pivotal thereon, a pin mounted in the bottom of said cylinder, means biasing said pin upwardly, said piston being engageable with said pin to deflect it downwardly when said piston is at its lowermost position into a position at which it engages said cam, and an actuator connected to said cam to rotate said cam whereby when it engages said pin it opens said valve.
Claim 2
Dependent Claim
214 words
A syphon, comprising a cylinder, a piston movable in said cylinder having a rod portion adapted to be connected to a lifting device and being movable toward one end of said cylinder to create a suction on the opposite end, a suction member carried by said cylinder and having a suction space which is adapted to be connected to the vacuum of said cylinder for establishing suction engagement of an article, venting valve means connected to said suction space for venting said space, actuating means connected to said venting valve means and settable by said piston when said piston is at a predetermined position to open said valve means and vent said suction member suction space, said venting valve means including a line connecting said cylinder from the side having the vacuum to said suction space, a valve in said line having a movable valve portion with a cam pivotal thereon, a pin mounted in the bottom of said cylinder, means biasing said pin upwardly, said piston being engageable with said pin to deflect it downwardly when said piston is at its lowermost position into a position at which it engages said cam, and an actuator connected to said cam to rotate said cam whereby when it engages said pin it opens said valve.
Claim 3
Dependent Claim
25 words
A syphon, according to claim 1, wherein said actuating means comprises a manual switch connected to said cam and being movable to move said cam.
Claim 4
Dependent Claim
28 words
A syphon, according to claim 2, including control means located on the exterior of said suction plate and constituting said actuating means for operating said venting valve means.
Claim 5
Dependent Claim
22 words
A syphon, according to claim 1, wherein said actuating means comprises a magnetic switch connected to said cam for actuating said cam.
Claim 6
Dependent Claim
198 words
A syphon, comprising a cylinder, a piston movable in said cylinder having a rod portion adapted to be connected to a lifting device and being movable toward one end of said cylinder to create a vacuum on the opposite end, a suction member carried by said cyLinder and having a suction space which is adapted to be connected to the vacuum of said cylinder for establishing a suction engagement of an article, venting valve means connected to said suction space for venting said space including a suction space vent having a valve setting member for opening and closing said vent arranged in line with said piston, an actuator connected to said setting member and located outside of said cylinder and being movable to shift said setting member between a non-active position in which it will not be contacted by said piston when said piston moves downwardly to a position adjacent the bottom of its stroke and being movable to an active projecting position in which it will be contacted by said piston when said piston moves to a position adjacent the bottom of its stroke to move said valve setting member to cause it to open said vent.
Claim 7
Dependent Claim
198 words
A syphon, comprising a cylinder, a piston movable in said cylinder having a rod portion adapted to be connected to a lifting device and being movable toward one end of said cylinder to create a vacuum on the opposite end, a suction member carried by said cyLinder and having a suction space which is adapted to be connected to the vacuum of said cylinder for establishing a suction engagement of an article, venting valve means connected to said suction space for venting said space including a suction space vent having a valve setting member for opening and closing said vent arranged in line with said piston, an actuator connected to said setting member and located outside of said cylinder and being movable to shift said setting member between a non-active position in which it will not be contacted by said piston when said piston moves downwardly to a position adjacent the bottom of its stroke and being movable to an active projecting position in which it will be contacted by said piston when said piston moves to a position adjacent the bottom of its stroke to move said valve setting member to cause it to open said vent.
Claim 8
Dependent Claim
34 words
A syphon, according to claim 5, wherein said piston includes damping means engageable with said cylinder to absorb stresses when said rod portion is engaged and said piston moves upwardly against said cylinder rapidly.
Claim 9
Dependent Claim
35 words
A syphon, according to claim 5, wherein said cylinder comprises upper and lower flanged portions having their flanges abutting, said piston including a rolling diaphragm connected thereto and connected between the flanges of said cylinder.
Claim 10
Dependent Claim
68 words
A syphon, according to claim 7, including a vertical guide member extending upwardly from the bottom of said cylinder, said piston rod portion being hollow and being of a size to accommodate said guide member during upward and downward movement of said piston, and guide bushing means defined on the end of said piston through which said piston rod portion extends forming a guide with said guide member.
Claim 11
Dependent Claim
87 words
A syphon, according to claim 5, wherein said valve setting member includes a pin disposed in the path of movement of said piston and being deflectable thereby, said venting valve means including a valve for said suction space vent for opening and closing communication of said suction space to atmosphere and having a cam portion, which is movable to actuate said valve, said cam portion being located to contact said pin only when said pin has been depressed by said piston to cause opening of said valve.
References Cited (Backward Citations)
US3322221A
Cited
US3431010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |