Arm structure for an injecting molding machine

Details Arm structure for an injecting molding machine Arm structure for an injecting molding machine

2000-04-19

2002-02-12

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

C100S281000, C425S593000

Reexamination Certificate

active

06345975

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to an arm structure for an injecting molding machine, particularly to one not needing to take off a connecting rod in removing an arm structure from a receiving disc and a movable mold base.
A conventional injecting molding machine with an arm structure shown in
FIG. 7
, includes a table
10
, an injecting structure
20
fixed on one side of the table
10
, and a movable mold base
40
and a receiving disc
50
combined with through holes at four corners by means of connecting rods
30
on the other side of the table
10
. The movable mold base
40
is connected to a piston rod of an oil pressure cylinder
501
connected with the arm structure and the receiving disc
50
. The oil pressure cylinder
501
operates to move the movable mold base
40
to open and close the mold.
The arm structure has arms
601
consisting of pivotal plates
6011
respectively having first ends fitted between two position plates
502
, as shown in
FIG. 8
, wherein the receiving disc
50
is shown as an example of pivotally connected to the am structure. The movable mold base
40
is also pivotally connected to the arm structure in the same way. It is not described and not shown in Figures. Then a long pivot
503
passes through pivot holes
504
of the receiving disc
50
(or the movable mold base
40
) and pivot holes (not shown in Figures) of each pivotal plate
6011
. Thus, the two ends of the arms
601
of the arm structure are respectively and pivotally connected to the receiving disc
50
and the movable mold base
40
.
However, this kind of arm structure has been used for years and it is not very convenient when the arm structure is to be taken off or to be assembled together as the connecting rods have to be first disassembled from the movable mold base or from the receiving disc and then the pivot
503
can be taken off to let the arm structure removed. This complicated pivotal connection involves much work and time in assembling and disassembling the arm structure with and from the movable mold base and the receiving disc.
In addition, each position plate
502
has the through hole vertical to form 90° against the receiving disc
50
and the movable mold base
40
so in boring the through holes of all position plates
502
or the same holes in the movable mold base, the receiving disc
50
or the movable mold base
40
has to be fixed on the surface of a boring machine and have to be aligned accurately for boring the through (pivot) holes of the position plates. Then the receiving disc
50
or the movable mold base
40
is turned for 90° and then aligned accurately for boring the through holes of the receiving disc or the movable mold base (or those in the position plates), as shown in FIG.
9
.
As can be understood from what is described, in boring the pivot holes or the through holes of the receiving disc
50
and the movable mold base
40
, it requires two times of alignment and correct boring with little errors resulting in much time and work.
SUMMARY OF THE INVENTION
This invention has been devised to offer an arm structure for an injecting molding machine, wherein a receiving disc and a movable mold base respectively have plural parallel position plates, which respectively have an outer end concave surface bored with a threaded hole, and an arm structure consists of two pairs of two arms—a first and a second one—positioned at two sides of the receiving disc and the movable mold base.
The first and the second arm respectively have plural parallel pivotal plates, and an outer end of each parallel pivotal plate fits in a gap defined by every two position plates of the receiving disc and the movable mold base. Then a tubular pivot respectively passes through the outer ends of the plural parallel pivotal plates and also fits in the concave end surfaces of the parallel position plates. Further, each tubular pivot has plural through holes corresponding to the threaded holes of the outer end concave surfaces of the parallel position plates of the receiving disc and the movable mold base for bolts to pass through the through holes and screw with the threaded holes for assembling the arm structure with the receiving disc and the movable mold base. Thus, the arm structure is pivotally connected between and to the receiving disc and the movable mold base. Therefore, the arm structure can be assembled with or disassembled from the receiving disc and the movable mold base only by taking off the bolts passing through each tubular pivot and screwing off the threaded holes.


REFERENCES:
patent: 4773845 (1988-09-01), Nagura et al.
patent: 5123834 (1992-06-01), Joyner
patent: 5971743 (1999-10-01), Virginio

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