Patent US3753636A successfully refreshed from Google Patents.
US3753636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase variator for blow molding equipment
Assignee: Graham Engineering Corp
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Filing: 1971-03-12
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Granted: 1973-08-21
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Expires: 1991-03-12
Abstract
Abstract A phase variator for a blow molding machine to (1) adjust and orient the profile of a parison relative to movable mold cavities as they are positioned around the parison prior to inflating the parison, and (2) regulate the timing with which the variations in the profile (i.e. wall thickness) are imparted to the parison. Such regulations may be made and adjusted while the machine is operating.
Inventors
- 👤 W Waterloo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/03; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
197 words
A machine for molding hollow articles from thermoplastic synthetic resin by blowing gaseous fluid into a hollow parison having a predetermined profile adapted to be oriented relative to a mold cavity in which said parison is positioned while the mold is moving in a predetermined path, said machine comprising in combination, a parison head, a die pin mounted in said head for axial reciprocation therein to provide an annular discharge opening for forming a desired profile within said parison, separable molding dies mounted for movement toward and from molding position and having cooperating cavities encircling said parison when said dies are in closed position, means to move said molding dies in unison along a predetermined path, power means operable to reciprocate said die pin to form the profile of said parison, control means for said power means operable to program precise movement of said die pin by said power means, and orienting means connected to said control means and operable to adjust the entire program of movement of said die pin by said control means simultaneously to orient said profile of said parison relative to the mold cavity formed by said molding dies when in molding position.
Claim 2
Dependent Claim
197 words
A machine for molding hollow articles from thermoplastic synthetic resin by blowing gaseous fluid into a hollow parison having a predetermined profile adapted to be oriented relative to a mold cavity in which said parison is positioned while the mold is moving in a predetermined path, said machine comprising in combination, a parison head, a die pin mounted in said head for axial reciprocation therein to provide an annular discharge opening for forming a desired profile within said parison, separable molding dies mounted for movement toward and from molding position and having cooperating cavities encircling said parison when said dies are in closed position, means to move said molding dies in unison along a predetermined path, power means operable to reciprocate said die pin to form the profile of said parison, control means for said power means operable to program precise movement of said die pin by said power means, and orienting means connected to said control means and operable to adjust the entire program of movement of said die pin by said control means simultaneously to orient said profile of said parison relative to the mold cavity formed by said molding dies when in molding position.
Claim 3
Dependent Claim
68 words
The machine according to claim 1 in which said power means which reciprocates said die pin comprises a double acting hydraulic unit connected to said die pin and having a piston reciprocatable within a ported cylinder, and said power means also including an electrically operated servo-valve connected to the ports of said cylinder to control the flow of fluid to and from the opposite ends of said cylinder.
Claim 4
Dependent Claim
54 words
The machine according to claim 2 in which said control means for said power means comprises a switch connected to said servo-valve and operable in response to a predetermined program delivered to said switch in accordance with the desired profile of a parison to actuate said switch to effect desired movement of said servo-valve.
Claim 5
Dependent Claim
54 words
The machine according to claim 2 in which said control means for said power means comprises a reed-type switch having a rotatable contact, and said control means also including means to drive said rotatable contact at a predetermined speed, and said phase orienting means being interconnected to said means to drive said rotatable contact.
Claim 6
Dependent Claim
31 words
The machine according to claim 4 in which said reed-type switch includes a plurality of adjustable resistors operable to control the movement and duration of movement or non-movement of said servo-valve.
Claim 7
Dependent Claim
47 words
The machine according to claim 5 in which said means to drive said rotatable contact comprises power means operable to drive said contact at substantially constant speed and said phase orienting means comprises means to vary the phase relationship between said power means and said reed-type switch.
Claim 8
Dependent Claim
45 words
The machine according to claim 6 further including means interconnecting said drive means for said rotatable contact and said power means, and means to effect adjustment between said drive means and interconnecting means to vary the operating phase between said drive means and power means.
Claim 9
Dependent Claim
71 words
The machine according to claim 6 in which said phase variating means comprises a rotatable drive member on said power means, a rotatable driven member on said rotatable contact, a flexible timing type drive member extending between and connecting said rotatable drive and driven members, and means operable to vary the distance between the axes of said drive and driven members and thereby shift the phase between the same as aforesaid.
Claim 10
Dependent Claim
71 words
The machine according to claim 8 furher including a rotatable idler member and said flexible timing type drive member being endless and extending around said drive member and idler member and one course thereof engaging said driven member to drive it, and means supporting said rotatable contact for movement longitudinally of said course of said endless drive member to effect variation in the operating phase between said drive and driven members.
Claim 11
Dependent Claim
42 words
The machine according to claim 1 in which said orienting means comprises phase variating means adjustably operable while the machine is operating to adjust said control means to effect a shift in the profile of said parison relative to said mold cavity.
Claim 12
Dependent Claim
18 words
The machine according to claim 10 in which said phase variating means includes an adjustable member operable manually.
Claim 13
Dependent Claim
80 words
The machine according to claim 1 in which said control means for said power means comprises an electric switch unit having a movable switching member continuously operable through a predetermined program to effect a desired cycle of movement of said die pin, power means to drive said switching member, and said orienting means being operable to shift said switching member relative to said drive therefor to adjust the operating phase between the movement of said parison and said mold cavity.
Claim 14
Dependent Claim
49 words
The machine according to claim 12 in which said orienting means is connected to said switching member to position it adjustably relative to said drive means, and said orienting means being adjustable while said machine is operating to change said operating phase between said parison and mold cavity therefor.
Claim 15
Dependent Claim
114 words
The machine according to claim 1 further including means to support a plurality of said molding dies for movement along a continuous path, power means to drive said mold supporting means, and means to operate said power means to reciprocate said die pin of said parison head in direct timed relationship with the mold positioning movement of said mold supporting means, whereby adjustment of said orienting means for said control means causes a change in the phase relation between said parison as continuously formed by said parison head and the position of said mold cavities relative to said parison as said cavities are moved by said mold supporting means for engagement with said parison.
Claim 16
Dependent Claim
105 words
The machine according to claim 14 in which said control means comprises a plurality of profile selector switches operable in a programmed sequence by a movable switching member and said power means comprising an electrically operable servo-valve and a hydraulic cylinder and piston unit controlled thereby to shift said die pin of said parison head cyclically as required to form a parison having a predetermined profile, said orienting means being operable to shift the sequential operating phase of said selector switches relative to the cycle of movement of said molding dies to effect a shift in position of said parison relative to said molding dies.
Claim 17
Dependent Claim
74 words
The machine according to claim 15 in which said profile selector switches each include an adjustable resistor connected in the electrical operating circuit of said servo-valve and operable to effect desired directed reciprocation or dwell of the piston of said hydraulic cylinder and piston unit, and means to adjust said respective profile selector switches to provide an operating program for said hydraulic cylinder and piston unit to produce a parison having a predetermined profile.
Claim 18
Dependent Claim
88 words
The machine according to claim 15 further including a movable switching member operable to sequentially operate said series of profile selector switches, power means for said switching member operable at a predetermined speed in correlation with the movement of said mold supporting means, driven means for said switching member connected to said power means, and means to shift said connection beTween said driven means and power means for said switching member to effect a change in operating phase between said parison and the cavities of said molding dies.
Claim 19
Dependent Claim
144 words
In apparatus for blow molding articles having a parison head, a die movable therein for forming a hollow parison having a predetermined profile along its length, and a pair of molding dies having portions for clamping around a length of the parison, power means operable to reciprocate said die pin to form the profile of said parison, and control means for said power means operable to program precise movement of said die pin by said power means, the improvement comprising orienting means connected to said control means and operable to adjust simultaneously the relative positions of all portions of the parison profile longitudinally relative to the molding dies during operation of the apparatus to insure that all said portions of said profile are positioned at a predetermined location between corresponding portions of the dies which clamp around the parison before the articles are formed.
Claim 20
Dependent Claim
144 words
In apparatus for blow molding articles having a parison head, a die movable therein for forming a hollow parison having a predetermined profile along its length, and a pair of molding dies having portions for clamping around a length of the parison, power means operable to reciprocate said die pin to form the profile of said parison, and control means for said power means operable to program precise movement of said die pin by said power means, the improvement comprising orienting means connected to said control means and operable to adjust simultaneously the relative positions of all portions of the parison profile longitudinally relative to the molding dies during operation of the apparatus to insure that all said portions of said profile are positioned at a predetermined location between corresponding portions of the dies which clamp around the parison before the articles are formed.
Claim 21
Dependent Claim
61 words
The improvement according to claim 18 wherein the apparatus includes means for repetitively imparting a predetermined profile to the parison along its length and the means for adjusting the position of the profile relative to the molding die portions includes a device connected to the profile imparting means for shifting the position of the profile along the length of the parison.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |