Tie rod structure for die closing unit of injection molding machine
OwnerKarl Hehlinventor
Life of this patent
Estimating the term…
Abstract
A tie rod structure for a die closing unit of an injection molding machine in which several parallel tie rods hold together a stationary die carrier plate and a stationary head plate, for example, and where the tie rods are seated in attachment bores of the connected plates whose diameter is the same as that of the tie rod guide portion, a threaded tie rod portion on the outside of the plate carrying a threaded abutment collar which is clamped against the plate by a clamping member engaging the extremity of the tie rod. The clamping member may be rotatable out of the way of the tie rod, in order to permit retraction of the latter.
Claims7
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.
Dependencies are inferred from the claim text.