US4050666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold ejector multiplier
Assignee: Individual
•
Filing: 1976-11-19
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Granted: 1977-09-27
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Expires: 1996-11-19
Abstract
Abstract A mold ejector multiplier is described in which the mold ejector is attached to the fast acting piston of a dual piston hydraulic device consisting of a main cylinder having a closed bottom adapted to act both as a cylinder and as a reservoir for hydraulic fluid with an outer piston adapted to reciprocate in the cylinder and an inner piston adapted to reciprocate in a cylindrical bore in the outer piston. Both pistons are in contact with the hydraulic fluid in the hydraulic fluid reservoir, so that when one piston is pushed in, the other automatically is pushed out and vice versa. The relative size of the two pistons, advantageously, is such that the inner piston moves more than one unit length for each unit length of movement of the outer piston. The device is mounted in the actuating plate of the mold ejector system with the inner piston connected to a mold ejector and the outer piston arranged to abut a stationary part of the mold when the actuating plate is moved to actuate the ejectors. Engagement of the outer piston by the fixed part of the mold causes it to enter the cylinder and to propel the inner piston out. This multiplies the rate at which the ejector is moved into contact with the workpiece so that the workpiece can be dislodged and ejected from the mold without manual intervention.
Inventors
- 👤 Jake W. Van Tichelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/10; B28B13/00; B28B13/04; B28B13/06; B28B13/067; B29; B29C; B29C45/00; B29C45/17; B29C45/40; B29C45/4005
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
129 words
In an apparatus for forming a workpiece which comprises separable forming elements in which a workpiece is formed and in which, when the elements are separated, the workpiece must be removed from one of them, ejector means adapted to engage said work piece and to dislodge it from said one element, ejector actuating means for engaging said ejector means to cause it to move to and from a position at which it engages and dislodges said workpiece, ejector multiplier means responsive to the movement of said ejector actuating means to multiply the extent and speed of movement of said ejector means, the improvement in said ejector multiplier means which comprises hydraulic means for accelerating the movement of the ejector means responsive to the movement of said ejector actuating means.
Claim 2
Dependent Claim
129 words
In an apparatus for forming a workpiece which comprises separable forming elements in which a workpiece is formed and in which, when the elements are separated, the workpiece must be removed from one of them, ejector means adapted to engage said work piece and to dislodge it from said one element, ejector actuating means for engaging said ejector means to cause it to move to and from a position at which it engages and dislodges said workpiece, ejector multiplier means responsive to the movement of said ejector actuating means to multiply the extent and speed of movement of said ejector means, the improvement in said ejector multiplier means which comprises hydraulic means for accelerating the movement of the ejector means responsive to the movement of said ejector actuating means.
Claim 3
Dependent Claim
29 words
The apparatus of claim 1, in which said hydraulic means causes said ejector means to move more than two units for each unit movement of said ejector actuating means.
Claim 4
Dependent Claim
85 words
The apparatus of claim 1, in which said hydraulic means comprises a dual piston hydraulic means having one piston responsive to the movement of said actuating means and an outer piston responsive to the movement of said one piston and operatively associated with said ejector means so that movement of said one piston causes movement of said ejector means, the relative size of said pistons being such that the said other piston moves more than one unit for each unit movement of said one piston.
Claim 5
Dependent Claim
80 words
The apparatus of claim 3, in which said one piston is an outer piston mounted to reciprocate in a hollow cylinder having a closed end adapted to act both as a cylinder and as a hydraulic fluid reservior and the other piston is an inner piston mounted to reciprocate in a cylindrical bore in said outer piston whereby, when one piston is pushed in against the hydraulic fluid in said reservoir, the other piston is pushed out and vice versa.
Claim 6
Dependent Claim
19 words
The apparatus of claim 4, in which the pistons are biased to the retracted position of said inner piston.
Claim 7
Dependent Claim
22 words
The apparatus of claim 5, in which stop means is provided to limit the inward and outward movement of said inner piston.
Claim 8
Dependent Claim
29 words
The apparatus of claim 6, in which said stop means comprises an extension of the bottom of said inner piston which limits the inward movement of said inner piston.
Claim 9
Dependent Claim
23 words
The apparatus of claim 6, in which said stop means comprises means for limiting the inward and outward movement of said outer piston.
Claim 10
Dependent Claim
25 words
The apparatus of claim 8, in which said stop means comprises a shoulder on said outer piston adapted to abut the top of said cylinder.
Claim 11
Dependent Claim
28 words
The apparatus of claim 8, in which said stop means comprises an inset shoulder on said outer piston adapted to engage a stop projecting inwardly from said cylinder.
Claim 12
Dependent Claim
65 words
The apparatus of claim 8, in which said stop means comprises a shoulder on said outer piston adapted to abut the top of said cylinder and an inset shoulder on said outer piston adapted to engage a stop projecting inwardly from said cylinder and in which said shoulders are so spaced as to admit only a limited in and out movement of said outer piston.
Claim 13
Dependent Claim
71 words
The apparatus of claim 8, in which said stop means comprises a shoulder on said outer piston adapted to abut the top of said cylinder and thereby limit the inward movement of said outer piston and an extension of the bottom of said inner piston which limits the inward movement of said inner piston, the outward movement of each piston being inherently limited by the inward movement of the other one.
Claim 14
Dependent Claim
29 words
The apparatus of claim 5, in which the biasing means comprises a plurality of Bellville washers between the bottom of said outer piston and the bottom of said cylinder.
Claim 15
Dependent Claim
22 words
The apparatus of claim 5, in which the biasing means comprises a coil spring arranged to urge the said inner piston inwardly.
Claim 16
Dependent Claim
31 words
The apparatus of claim 5, in which the biasing means comprises Bellville washers arranged to urge said outer piston outwardly and a coil spring arranged to urge said inner piston inwardly.
Claim 17
Dependent Claim
37 words
The apparatus of claim 4, in which said pistons comprise packing grooves filled with an O-ring and a Teflon seal, said O-ring being under compression thereby forcing said Teflon seal into intimate contact with the cylinder wall.
Claim 18
Dependent Claim
17 words
The apparatus of claim 4, in which said cylinder has a bleeder valve in the bottom thereof.
Claim 19
Dependent Claim
42 words
The apparatus of claim 7, in which said cylinder has a bleeder valve in the bottom thereof and having a point projected into said cylinder and in which the bottom of said inner cylinder has a recess adapted to accomodate said point.
Claim 20
Dependent Claim
20 words
The apparatus of claim 7, in which the extension of said inner piston has radial grooves across the bottom thereof.
Claim 21
Dependent Claim
21 words
The apparatus of claim 19, in which the extension of said inner piston has axial grooves communicating with said radial grooves.
Claim 22
Dependent Claim
47 words
The apparatus of claim 14, in which said inner piston comprises a piston head and a piston rod and said outer piston has a shoulder projecting inwardly toward said piston rod and in which said coil spring is under compression between said piston head and said shoulder.
Claim 23
Dependent Claim
102 words
The apparatus of claim 4, in which the apparatus has a stationary means through which said ejector means moves, in which said cylinder is mounted to move with said ejector actuating means toward said fixed means and in which said outer piston is adapted to engage said fixed means whereby, on continued movement of said ejector actuating means toward said fixed means, said outer piston is forced into said cylinder and said inner piston, as a consequence thereof, is forced out, whereby one unit movement of the ejector actuating means causes one plus more than one unit movement of the ejector means.
Claim 24
Dependent Claim
61 words
The apparatus of claim 4, in which the relative size of said outer piston and said inner piston is such that one unit movement of said outer piston inwardly causes at least two unit movements of said inner piston outwardly, whereby one unit movement of said ejector actuating means causes one plus at least two unit movements of said ejector means.
Claim 25
Dependent Claim
75 words
The apparatus of claim 23, in which said outer piston has a circumferential shoulder, the bottom of which is adapted to abut the top of said cylinder and limit the inward movement of said outer piston and the top of which is adapted to engage said fixed member when the ejector actuating means is moved toward said fixed member and in which stop means is provided to limit the outward movement of said outer piston.
Claim 26
Dependent Claim
38 words
The apparatus of claim 24 in which Bellville spring washers are interposed between said cylinder and said outer piston to urge that piston outwardly and in which coil spring means is provided to urge said inner piston inwardly.
Claim 27
Dependent Claim
47 words
The apparatus of claim 25, in which said inner piston has a piston head and a piston rod and said outer piston has a shoulder projecting inwardly toward said piston rod and in which said coil spring is under compression between said piston head and said shoulder.
Claim 28
Dependent Claim
73 words
The apparatus of claim 26, in which said piston head has an extension adapted to abut the bottom of said cylinder and thereby limit the inward movement of said inner piston, the length of said extension and the amount of hydraulic fluid in said reservior being such that when said extension rests on the bottom of said cylinder, the said piston head is still in the inner cylindrical portion of said outer piston.
Claim 29
Dependent Claim
25 words
The apparatus of claim 26, in which said piston rod has means at the outer end thereof for connecting the same with said ejector means.
Claim 30
Dependent Claim
74 words
The apparatus of claim 22, in which said cylinder has a cylindrical outer dimension having a collar at the top thereof and is mounted in a cylindrical bore in said ejector actuating means with said collar resting on the top of said cylindrical bore and in which a retainer means is fastened to said ejector actuating means in engagement with the top of said collar thereby securing said cylinder in said ejector actuating means.
Claim 31
Dependent Claim
74 words
The apparatus of claim 27, in which said cylinder has a cylindrical outer dimension having a collar at the top thereof and is mounted in a cylindrical bore in said ejector actuating means with said collar resting on the top of said cylindrical bore and in which a retainer means is fastened to said ejector actuating means in engagement with the top of said collar thereby securing said cylinder in said ejector actuating means.
Claim 32
Dependent Claim
49 words
The apparatus of claim 4 in which said ejector actuating means comprises a main ejector actuating means and an accelerated ejector actuating means, and in which said outer piston is actuated by said main ejector actuating means and said accelerated ejector actuating means is actuated by said inner piston.
References Cited (Backward Citations)
US2304899A
Cited
US2485283A
Cited
US3137905A
Cited
US3334378A
Cited
US3482284A
Cited
US3479698A
Cited
US3645492A
Cited
US3807682A
Cited
US3893644A
Cited
US3914086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |