US4080144A — Tie rod structure for die closing unit of injecti…

Claim 1

Independent Claim 283 words

In a die closing unit for an injection molding machine comprising, as part of said unit, a stationary die carrier plate and a movable die carrier plate to which are attachable stationary and movable die plates which form an injection molding die, said die carrier plates being arranged transversely to a longitudinal axis along which the movable die carrier plate is displaceable in a die opening and closing movement, while being guided and supported by at least two parallel longitudinal tie rods, said tie rods extending between the two die carrier plates and having at least one tie rod end portion connected to one of the die carrier plates in a tie rod connection which includes an attachable bore in the die carrier plate through which the connected tie rod end portion protrudes to the other side of the plate, where said end portion is threaded and engaged by a likewise threaded abutment collar, while a clamping member bears against the extremity of the protruding tie rod end portion, under the action of at least one clamping bolt, thereby axially preloading the tie rod connection by pressing its abutment collar against the die carrier plate, the improvement therein relating to said tie rod connection and comprising: a seating engagement between said tie rod end portion and the attachment bore of the connected die carrier plate, the seated part of the tie rod end portion being as large in diameter as the tie rod portion which extends between the die carrier plates; and means defined by said clamping member and clamping bolt for swivelling the clamping member about the clamping bolt, following minimal unscrewing of the clamping bolt, for elimination of its clamping action.

Claim 2

Dependent Claim 283 words

In a die closing unit for an injection molding machine comprising, as part of said unit, a stationary die carrier plate and a movable die carrier plate to which are attachable stationary and movable die plates which form an injection molding die, said die carrier plates being arranged transversely to a longitudinal axis along which the movable die carrier plate is displaceable in a die opening and closing movement, while being guided and supported by at least two parallel longitudinal tie rods, said tie rods extending between the two die carrier plates and having at least one tie rod end portion connected to one of the die carrier plates in a tie rod connection which includes an attachable bore in the die carrier plate through which the connected tie rod end portion protrudes to the other side of the plate, where said end portion is threaded and engaged by a likewise threaded abutment collar, while a clamping member bears against the extremity of the protruding tie rod end portion, under the action of at least one clamping bolt, thereby axially preloading the tie rod connection by pressing its abutment collar against the die carrier plate, the improvement therein relating to said tie rod connection and comprising: a seating engagement between said tie rod end portion and the attachment bore of the connected die carrier plate, the seated part of the tie rod end portion being as large in diameter as the tie rod portion which extends between the die carrier plates; and means defined by said clamping member and clamping bolt for swivelling the clamping member about the clamping bolt, following minimal unscrewing of the clamping bolt, for elimination of its clamping action.

Claim 3

Dependent Claim 107 words

An improved tie rod connection as defined in claim 1, wherein the clamping member is a plate-like clamping flange extending transversely across the extremity of the tie rod and bearing against an end face of the latter; the clamping flange cooperates with at least two clamping bolts which are arranged on opposite sides of the tie rod, engaging threaded bores in the connected die carrier plate; and at least one clamping bolt has a retaining clip arranged on its shaft, in the space between the clamping flange and the die carrier plate, thereby preventing removal of the bolt from the flange, after unscrewing from its threaded bore.

Claim 4

Dependent Claim 118 words

An improved tie rod connection as defined in claim 1, wherein the clamping member is a plate-like clamping flange extending transversely across the extremity of the tie rod and bearing against an end face of the latter; the clamping flange cooperates with two clamping bolts which are arranged diametrically opposite one another in relation to the tie rod extremity, engaging threaded bores in the connected die carrier plate; and said clamping flange swivelling means includes two openings in the clamping flange for the two clamping bolts, a first opening being a peripherally open slot allowing for the disengagement of the clamping flange from the associated first clamping bolt in a transverse movement, following minimal unscrewing of both bolts.

Claim 5

Dependent Claim 79 words

An improved tie rod connection as defined in claim 3, wherein the peripherally open slot in the clamping flange opens substantially radially outwardly, away from the tie rod extremity; and the second opening in the clamping flange, for the associated second clamping bolt, is in the form of a closed slot extending substantially radially inwardly from the clamping bolt towards the tie rod extremity, over a distance sufficient to allow for said transverse disengaging movement of the clamping flange.

Claim 6

Dependent Claim 69 words

An improved tie rod connection as defined in claim 1, wherein the clamping member is an elongated clamping bracket extending transversely to the tie rod, having one extremity bearing against the tie rod extremity and the other extremity supported against the connected die carrier plate, at a distance from the tie rod extremity; and the clamping bolt engages the clamping bracket at a point intermediate the two bracket extremities.

Claim 7

Dependent Claim 53 words

An improved tie rod connection as defined in claim 5, wherein the clamping bracket extremity which is supported against the plate is part of an angled-off leg portion of the bracket whose length is substantially the same as the length over which the tie rod end portion protrudes from the die carrier plate.

Claim 8

Dependent Claim 51 words

An improved tie rod connection as defined in claim 1, wherein each tie rod includes, in its connected end portion, a central axially oriented threaded bore for the attachment of a matching threaded traction rod which serves to retract the tie rod through the attachment bore of the die carrier plate.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1981-03-20	1981-09-19	1982-03-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1985-03-20	1985-09-19	1986-03-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1989-03-20	1989-09-19	1990-03-21	$7700.00	Window Closed / Lapsed

Tie rod structure for die closing unit of injection molding machine

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