US3704038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative pressure lift device
Assignee: Individual
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Filing: 1971-07-12
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Granted: 1972-11-28
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Expires: 1991-07-12
Abstract
Abstract A negative pressure lift device is shown which exhibits a suction cannister consisting of an upper part shaped as a cover and having a center opening to accommodate a piston rod connected to a disk piston, and a funnel-shaped lower part connected thereto, which has a bottom opening to accommodate the disk piston. This device is provided with a sealing membrane affixed, respectively, in the flange-joint between the upper and lower parts and to the disk piston. When the piston rod is lifted a vacuum is created between the membrane, the lower part and the object to be lifted.
Inventors
- 👤 Rudolf Glanemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:16
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0237; B66C1/025; B66C1/0212
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
218 words
A negative pressure lift device, comprising: a. a lift frame; b. a suction cannister having an upper cover portion with a center opening, and a lower generally funnel-shaped portion connected by a peripheral flange joint, said lower portion having a flat base with a center opening adapted to be placed over a flat object to be lifted; c. a hollow piston rod extending through said center opening of said upper portion having its upper end secured to said lift frame, and having a disk piston connected at its bottom end to close said center opening of said lower portion, said disk piston having bore hole means in communication with the interior of said piston rod; d. a sealing membrane fastened at its periphery in said flange joint and having a center opening with the edge thereof sealed to said disk piston whereby a vacuum can be developed between said membrane, said lower portion and said object when said piston rod is lifted; e first means including valve means within said hollow piston rod for opening and closing said bore hole means; and f. means on said lift frame responsive to the lifting thereof to operate said first means to open or close said bore hole means each time said frame is lifted in accordance with a predetermined program.
Claim 2
Dependent Claim
218 words
A negative pressure lift device, comprising: a. a lift frame; b. a suction cannister having an upper cover portion with a center opening, and a lower generally funnel-shaped portion connected by a peripheral flange joint, said lower portion having a flat base with a center opening adapted to be placed over a flat object to be lifted; c. a hollow piston rod extending through said center opening of said upper portion having its upper end secured to said lift frame, and having a disk piston connected at its bottom end to close said center opening of said lower portion, said disk piston having bore hole means in communication with the interior of said piston rod; d. a sealing membrane fastened at its periphery in said flange joint and having a center opening with the edge thereof sealed to said disk piston whereby a vacuum can be developed between said membrane, said lower portion and said object when said piston rod is lifted; e first means including valve means within said hollow piston rod for opening and closing said bore hole means; and f. means on said lift frame responsive to the lifting thereof to operate said first means to open or close said bore hole means each time said frame is lifted in accordance with a predetermined program.
Claim 3
Dependent Claim
147 words
The device of claim 1 wherein the hollow piston rod has an internal ring recess for an inner pressure cylinder with a piston and an inner piston rod which projects downwardly to said disk piston and constitutes a part of the said valve means, wherein the inner pressure cylinder is connected via a compressed air line to an outer pressure cylinder which is mounted on said lift frame wherein a piston of the outer pressure cylinder is connected to a pull rod of the lift frame, wherein compressed air generated in the outer pressure cylinder upon lifting of said pull rod is conducted either to said inner pressure cylinder or into the open by means of a commutator cylinder in said compressed air line which has a valve regulated by the pull rod carrying a pawl to actuate a ratchet wheel which in turn actuates the valve.
Claim 4
Dependent Claim
80 words
A negative pressure lift device according to claim 1 wherein said first means includes a valve cylinder which is open on one side and provided with internal threads and an external collar in the area of the bore hole means, a screw plug screwed into the valve cylinder, an inner piston rod which fits through an opening in the screw plug, and which has a terminal collar, and a compression spring mounted between the plug and the inner ring recess.
Claim 5
Dependent Claim
76 words
A device according to claim 3 wherein the disk piston bore hole means includes a large incomplete bore hole with a ring groove in the base thereof and a rubber seal therein, and a small concentric bore hole, said external collar of the valve cylinder pressing against said rubber seal and the closed end of the valve cylinder being located in the small bore hole of the disk piston when said bore hole means is closed.
Claim 6
Dependent Claim
71 words
A negative pressure lift device according to claim 2 wherein the commutator cylinder exhibits two chambers in one of which a vaLve disk with a double-bearing commutator pusher is mounted which can be raised and lowered by that portion which projects to the outside of the chamber, for which purpose an octagonal commutator disk is employed, which is firmly connected to an eight-tooth ratchet wheel which is moved by the pawl.
Claim 7
Dependent Claim
34 words
A negative pressure lift device according to claim 2 wherein two or more suction cannisters are mounted on an appropriately constructed lift frame and the size of the outer pressure cylinder is adjusted accordingly.
Claim 8
Dependent Claim
83 words
A negative pressure lift device according to claim 2 wherein a hole in said lower portion closeable by said sealing membrane, is provided near the flange joint of the upper portion and the lower portion, from which hole a vacuum tube leads to a hollow traverse arm which communicates with a back pressure valve which is mounted on the underside of and in communication with the outer pressure cylinder and which opens when the lift device is raised to evacuated the traverse arm.
Claim 9
Dependent Claim
38 words
A negative pressure lift device according to claim 7 wherein the sealing membrane exhibits a knub or the like on its underside opposite the hole, which knub fits into a recess located at one end of the hole.
Claim 10
Dependent Claim
73 words
A negative pressure lift device according to claim 7 wherein an additional back pressure relief valve is provided on the underside of the outer pressure cylinder, which back pressure valve has a valve plate which closes an opening in the bottom of the outer pressure cylinder under the pressure of a spring and which back pressure valve opens to the outside under the affect of compressed air when the lift device is lowered.
Claim 11
Dependent Claim
76 words
A negative pressure lift device according to claim 1 wherein said valve means comprises two valve disks connected together, between which a flexible membrane is stretched, wherein above the membrane in the upper valve disk a hole communicates with a compressed air line, and wherein beneath the membrane, in the lower valve disk, there is a hole into which an upward projecting center journal of the disk piston protrudes to a point just under the membrane.
Claim 12
Dependent Claim
31 words
A negative pressure lift device according to claim 10 wherein the disk piston exhibits several air passage holes within the confines of a ring groove, in which rests a rubber seal.
Claim 13
Dependent Claim
35 words
A negative pressure lift device according to claim 11 wherein the lower valve disk has a downwardly protruding ring shoulder which rests on the rubber seal of the disk piston when the valve is closed.
Claim 14
Dependent Claim
141 words
A negative pressure lift device, comprising: a. a lift frame; b. a suction cannister having a base with an opening therein adapted to be placed over an object to be lifted; c. a hollow piston rod extending through an opening in an upper cover portion of said cannister and having a disk piston at its bottom end to close said base opening, said disk piston having bore hole means leading to the interior of said hollow piston rod; d. means connecting said piston rod at its upper end to said frame; e. a flexible sealing membrane connected between said disk piston and the interior of said cannister; f. first means within said hollow piston rod for opening and closing said bore hole means; and g. second means on said lift frame responsive to the lifting thereof to operate said first means.
Claim 15
Dependent Claim
141 words
A negative pressure lift device, comprising: a. a lift frame; b. a suction cannister having a base with an opening therein adapted to be placed over an object to be lifted; c. a hollow piston rod extending through an opening in an upper cover portion of said cannister and having a disk piston at its bottom end to close said base opening, said disk piston having bore hole means leading to the interior of said hollow piston rod; d. means connecting said piston rod at its upper end to said frame; e. a flexible sealing membrane connected between said disk piston and the interior of said cannister; f. first means within said hollow piston rod for opening and closing said bore hole means; and g. second means on said lift frame responsive to the lifting thereof to operate said first means.
Claim 16
Dependent Claim
28 words
The device of claim 13 wherein said bore hole means is alternately opened and closed by said first and second means as said lift frame is repeatedly lifted.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |