CA1269813A - Rack and pinion gear stack mold control - Google Patents
Rack and pinion gear stack mold controlInfo
- Publication number
- CA1269813A CA1269813A CA000549844A CA549844A CA1269813A CA 1269813 A CA1269813 A CA 1269813A CA 000549844 A CA000549844 A CA 000549844A CA 549844 A CA549844 A CA 549844A CA 1269813 A CA1269813 A CA 1269813A
- Authority
- CA
- Canada
- Prior art keywords
- mold
- rack
- pinion gear
- gear
- center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides in a stack mold comprising a center mold part, first and second outside mold parts movable at both sides of the center mold part, a rack and pinion gear arrangement to move the outside mold parts. The rack and pinion gear arrangement comprises a plurality of pinion gears located at the center mold part and including a drive gear and first and second follower gears driven off the drive gear. Also provided are first and second free ended racks extending in opposite directions from the first and second outside mold parts respectively in engagement with the first and second follower gears. These follower gears reach above and below the drive gear and the first follower gear is offset to the side of the drive gear opposite that to which the free end of the first rack extends while the second follower gear is offset to the side of the drive gear opposite that to which the free end of the second rack extends.
The present invention provides in a stack mold comprising a center mold part, first and second outside mold parts movable at both sides of the center mold part, a rack and pinion gear arrangement to move the outside mold parts. The rack and pinion gear arrangement comprises a plurality of pinion gears located at the center mold part and including a drive gear and first and second follower gears driven off the drive gear. Also provided are first and second free ended racks extending in opposite directions from the first and second outside mold parts respectively in engagement with the first and second follower gears. These follower gears reach above and below the drive gear and the first follower gear is offset to the side of the drive gear opposite that to which the free end of the first rack extends while the second follower gear is offset to the side of the drive gear opposite that to which the free end of the second rack extends.
Description
FIELD OF THE INVENTION
-- . _ The present invention relates to a stack mold and in particular a new and improved rack and pinion gear arrangement for increased opening of the stack mold.
BACKGROUND OF THE INVENTION
As known stack molds include a center mold part, generally the female part of the mold, and two outside male mold parts which open and close relative to the center mold part. Typically the opening and closing of these stack molds is controlled through a rack and pinion gear arrangement comprising individual racks from the twu outside mold parts which are driven off ùne big pinion gear located at the center mold part. The racks on the outside mold parts extend across the center mold part only as far as the outside surface of the opposite outside mold part when the s-tack mold is closed. It is not desirable to increase the length on the racks beyond this point otherwise they interfere with the outside mounting surfaces for the mold parts which would then require special molding machine modifications to accomodate the increased length of the racks.
~`~P
~L~fi~3 51~6A/0065A - 2 - 6~56 1 The required relatively limited length of the racks in combination with a single pinion gear for controlling rack movement results in a relatively limited opening and sormewhat poor access to the stack mold which may for example make it awkward to eject the molded pieces even with the stack mold in the fully opened position.
SUMMARY OF THE PRESENT INVENTION
The present invention provides in a stack mold comprising a center mold part, first and second ou-tside mold parts movable at both sides of the center mold part, a rack and pinion gear arrangement moving the first and second outside mold parts. Accordin0 to the present invention the rack and pinion gear arrangement comprises pinion gear means located at the center mold par-t and includiny a drive gear and first and second follower gears driven off -the drive gear. Also provided are first and second free ended racks extending in opposite directions from the first and second outside mold parts respectively and in engagernent with the first and second follower gears. The two follower gears reach above and below the drive gear and the first follower gear is offset to the side of the drive gear opposite that to which the Free end of the first rack extends while the second follower gear 5146A/0065A - 3 ~ 6~56 1 is offset to the side of the drive gear opposite that to which the free end of the second rack extends. This arrangement effectively increases the lengths of the racks in contact with the pinion gear arrangement and provides increased opening of the stack mold in comparison to conventional stack molds.
BRIEF DISCUSSION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is an exploded perspective view of a stack mold showing the center female mold part and the two outside male mold parts separated Frorn one another;
Figure 2 is an assembled view of the stack mold of` figure 1 showing a prior art rack and pinion gear arrangemen-t for opening and closing of the stack mold;
Figure 3 is an assembled perspective view of the stack mold of figure 1 showing the rack and pinion gear arrangement according to a preferred embodiment of the present invention.
51~16A/0065A ~ 6fl56 EMBODIMENTS OF THE PRESENT INVENTION
Figure 1 shows in the exploded or open form a stack mold comprising a center female mold part 1 with first and second outside mold parts 3 and 7 respectively.
The two outside ~o~d parts open and close relative to the center mold part during a molding operation which comprises injecting a flowable material into the stack mold while the mold sections are closed and thereafter ejecting the pieces formed from the mold when the mold parts are opened. Note in figure 2 the type of pieces such as buckets B which are formed from the stack molds shown in the drawings.
In order the ensure proper alignment of the outside mold parts rslative to the center mold part the stack mold Further includes a guide rod 11 as well as stud and socket fittings 13 and 15 which place the male projections of the outside mold part directly over the female receptacles of the center mold part.
~LZ69~3~3 51~lGA/0065A ~ 5 - 6856 1 Figure 2 is labelled PRIOR ART shows the conventional rack and pinion gear arrangement which is used to open and close the stack mold. This arrangement comprises one large pinion gear indicated at PG in figure
-- . _ The present invention relates to a stack mold and in particular a new and improved rack and pinion gear arrangement for increased opening of the stack mold.
BACKGROUND OF THE INVENTION
As known stack molds include a center mold part, generally the female part of the mold, and two outside male mold parts which open and close relative to the center mold part. Typically the opening and closing of these stack molds is controlled through a rack and pinion gear arrangement comprising individual racks from the twu outside mold parts which are driven off ùne big pinion gear located at the center mold part. The racks on the outside mold parts extend across the center mold part only as far as the outside surface of the opposite outside mold part when the s-tack mold is closed. It is not desirable to increase the length on the racks beyond this point otherwise they interfere with the outside mounting surfaces for the mold parts which would then require special molding machine modifications to accomodate the increased length of the racks.
~`~P
~L~fi~3 51~6A/0065A - 2 - 6~56 1 The required relatively limited length of the racks in combination with a single pinion gear for controlling rack movement results in a relatively limited opening and sormewhat poor access to the stack mold which may for example make it awkward to eject the molded pieces even with the stack mold in the fully opened position.
SUMMARY OF THE PRESENT INVENTION
The present invention provides in a stack mold comprising a center mold part, first and second ou-tside mold parts movable at both sides of the center mold part, a rack and pinion gear arrangement moving the first and second outside mold parts. Accordin0 to the present invention the rack and pinion gear arrangement comprises pinion gear means located at the center mold par-t and includiny a drive gear and first and second follower gears driven off -the drive gear. Also provided are first and second free ended racks extending in opposite directions from the first and second outside mold parts respectively and in engagernent with the first and second follower gears. The two follower gears reach above and below the drive gear and the first follower gear is offset to the side of the drive gear opposite that to which the Free end of the first rack extends while the second follower gear 5146A/0065A - 3 ~ 6~56 1 is offset to the side of the drive gear opposite that to which the free end of the second rack extends. This arrangement effectively increases the lengths of the racks in contact with the pinion gear arrangement and provides increased opening of the stack mold in comparison to conventional stack molds.
BRIEF DISCUSSION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is an exploded perspective view of a stack mold showing the center female mold part and the two outside male mold parts separated Frorn one another;
Figure 2 is an assembled view of the stack mold of` figure 1 showing a prior art rack and pinion gear arrangemen-t for opening and closing of the stack mold;
Figure 3 is an assembled perspective view of the stack mold of figure 1 showing the rack and pinion gear arrangement according to a preferred embodiment of the present invention.
51~16A/0065A ~ 6fl56 EMBODIMENTS OF THE PRESENT INVENTION
Figure 1 shows in the exploded or open form a stack mold comprising a center female mold part 1 with first and second outside mold parts 3 and 7 respectively.
The two outside ~o~d parts open and close relative to the center mold part during a molding operation which comprises injecting a flowable material into the stack mold while the mold sections are closed and thereafter ejecting the pieces formed from the mold when the mold parts are opened. Note in figure 2 the type of pieces such as buckets B which are formed from the stack molds shown in the drawings.
In order the ensure proper alignment of the outside mold parts rslative to the center mold part the stack mold Further includes a guide rod 11 as well as stud and socket fittings 13 and 15 which place the male projections of the outside mold part directly over the female receptacles of the center mold part.
~LZ69~3~3 51~lGA/0065A ~ 5 - 6856 1 Figure 2 is labelled PRIOR ART shows the conventional rack and pinion gear arrangement which is used to open and close the stack mold. This arrangement comprises one large pinion gear indicated at PG in figure
2 located at the center mold part and first and second racks 6 and 8 which extend forwardly From the first and second outside mold parts 3 and 7 respectively. It is to be noted in figure 2 that rack 6 extends only as far as the back surface O of outside mold part 7 while rack 8 extends only as far as the back surface 5 of outside mold part 3. It is not desired to extend these racks past these positions since otherwise they tend to interfere with other equipment around the mold which would then require modifications to receive the extended length racks.
Staying with figure 2 it will be well appreciated how the outside mold parts can only open to khe extent that racks 6 and 8 maintain engagernent with the one large pinion gear PG~ Therefore, the opening of the stack mold is directly propor-tional to the length of rack extending past the center point on the pinion gear, i.e. the distance between the free end of the rack and the center point on the pinion gear.
5146A/OOG5A - 6 - 6~5 1 The purpose of the present invention is to increase the degree to which the outside mold parts can oe opened relative to the center mold part for creating a larger clearance area to gain access to the interior of the mold and to provide greater clearance for piece ejection from the mold. Figure 3 shows the novel rack and pinion gearing arrangement of the present invention to achieve this purpose.
More particularly, as will be seen in figure 3 the one large pinion PG is in accordance with the present invention replaced by a plurality of pinion gears comprising a center drive gear 17 as well as a pair of follower gears 19 and 21 driven off drive gear 17. The arrangement of the pinion gears is such that follower gear 19 reaches above and is located to the second outside mold part side of the drive gear opposite the side to which the free end of rack 8 extends. Follower gear 21 on the other .hand reaches below and is located to the first outside mold part side of drive gear 17 away from the free end of rack 6. According to the arrangement shown the three pinion gears are aligned along their center axis and the two follower geas are of the same diameter with identical teeth configuration for simultaneous and corresponding opening of the two outside mold sections. Furthermore, ~26~8~
51~l6A/0065A - 7 - 6856 1 because the two follower gears are controlled by one common drive gear the two racks are always moved in opposing directions consistent with the use of one large pinion gear as shown in figure 2.
By using three pinion gears and by offsetting the follower gears to the side of the drive gear away from the free end of the first and second racks the effective length of the racks for contact with thepinion gear drive is increased thereby allowing increased opening of the two outside mold parts. More specifically the effective increased length of the two racks is the distance between the center point on the drive gear and the center point on the individual follower gears since the racks can now be drawn back past the drive gear while maintaining contact with the follower gears. The actual increased opening space of the mold parts is directly proportionate to the si~e of the gears and the diagonal on which the gears are placed.
The description above relates to the two outside mold parts moving relative to the center mold part through the use of a triple pinion gear arrangement. It is to be ~26~1L3 51~6A/0065A ~ 56 1 appreciated that this same triple pinion gear arrangement fittable to a pair of racks can equally as well be used with a mold system in which one of the outside mold parts remains stationary while the center and other end mold parts are moved by the triple pinion gear and rack system for opening and closing the mold.
Although various preferred embodiments of the invention have been described herein in detail, it will be appreciated by those skilled in the art that variationsa may be made without departing from the spirit of the invention or the scope of the appended claims.
, . ,, .,.,,, ~ , . .. .
Staying with figure 2 it will be well appreciated how the outside mold parts can only open to khe extent that racks 6 and 8 maintain engagernent with the one large pinion gear PG~ Therefore, the opening of the stack mold is directly propor-tional to the length of rack extending past the center point on the pinion gear, i.e. the distance between the free end of the rack and the center point on the pinion gear.
5146A/OOG5A - 6 - 6~5 1 The purpose of the present invention is to increase the degree to which the outside mold parts can oe opened relative to the center mold part for creating a larger clearance area to gain access to the interior of the mold and to provide greater clearance for piece ejection from the mold. Figure 3 shows the novel rack and pinion gearing arrangement of the present invention to achieve this purpose.
More particularly, as will be seen in figure 3 the one large pinion PG is in accordance with the present invention replaced by a plurality of pinion gears comprising a center drive gear 17 as well as a pair of follower gears 19 and 21 driven off drive gear 17. The arrangement of the pinion gears is such that follower gear 19 reaches above and is located to the second outside mold part side of the drive gear opposite the side to which the free end of rack 8 extends. Follower gear 21 on the other .hand reaches below and is located to the first outside mold part side of drive gear 17 away from the free end of rack 6. According to the arrangement shown the three pinion gears are aligned along their center axis and the two follower geas are of the same diameter with identical teeth configuration for simultaneous and corresponding opening of the two outside mold sections. Furthermore, ~26~8~
51~l6A/0065A - 7 - 6856 1 because the two follower gears are controlled by one common drive gear the two racks are always moved in opposing directions consistent with the use of one large pinion gear as shown in figure 2.
By using three pinion gears and by offsetting the follower gears to the side of the drive gear away from the free end of the first and second racks the effective length of the racks for contact with thepinion gear drive is increased thereby allowing increased opening of the two outside mold parts. More specifically the effective increased length of the two racks is the distance between the center point on the drive gear and the center point on the individual follower gears since the racks can now be drawn back past the drive gear while maintaining contact with the follower gears. The actual increased opening space of the mold parts is directly proportionate to the si~e of the gears and the diagonal on which the gears are placed.
The description above relates to the two outside mold parts moving relative to the center mold part through the use of a triple pinion gear arrangement. It is to be ~26~1L3 51~6A/0065A ~ 56 1 appreciated that this same triple pinion gear arrangement fittable to a pair of racks can equally as well be used with a mold system in which one of the outside mold parts remains stationary while the center and other end mold parts are moved by the triple pinion gear and rack system for opening and closing the mold.
Although various preferred embodiments of the invention have been described herein in detail, it will be appreciated by those skilled in the art that variationsa may be made without departing from the spirit of the invention or the scope of the appended claims.
, . ,, .,.,,, ~ , . .. .
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rack and pinion gear arrangement for movement of first and second outside mold parts relative to a center mold part in a stack mold, said rack and pinion gear arrangement comprising pinion gear means located at said center mold part including a drive gear, first and second follower gears driven off said drive gear and first and second free ended racks extending in opposite directions from said first and second outside mold parts respectively and in engagement with said first and second follower gears, said follower gears reaching above and below said drive gear and said first follower gear being offset to a first side of said drive gear opposite that to which the free end of said first rack extends and said second follower gear being offset to a second side of said drive gear opposite that to which the free end of said second rack extends for opening and closing said stack mold.
2. A rack and pinion gear arrangement for opening and closing a stack mold having a center mold part with first and second outside mold parts to either side of said center mold part with relative movement between all of said mold parts, said rack and pinion gear arrangement comprising a center pinion gear and upper and lower pinion gears meshed with and off-set to either side of said center pinion gear and first and second free ended racks extending in opposite directions from said first and second outside mold parts and in engagement with said upper and lower pinion gear for opening and closing said stack mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000549844A CA1269813A (en) | 1987-10-21 | 1987-10-21 | Rack and pinion gear stack mold control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000549844A CA1269813A (en) | 1987-10-21 | 1987-10-21 | Rack and pinion gear stack mold control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1269813A true CA1269813A (en) | 1990-06-05 |
Family
ID=4136691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000549844A Expired CA1269813A (en) | 1987-10-21 | 1987-10-21 | Rack and pinion gear stack mold control |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1269813A (en) |
-
1987
- 1987-10-21 CA CA000549844A patent/CA1269813A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |