|US 9,808,846 B2|
|Locking device for locking tools in a press brake|
|Domenico Mazzocchi, Vigolzone (IT)|
|Assigned to ROLLERI S.P.A., Vigolzone (PC) (IT)|
|Appl. No. 14/916,661
|Filed by ROLLERI S.P.A., Vigolzone (PC) (IT)|
|PCT Filed Sep. 15, 2014, PCT No. PCT/IB2014/064524
§ 371(c)(1), (2) Date Mar. 4, 2016,
PCT Pub. No. WO2015/036981, PCT Pub. Date Mar. 19, 2015.
|Claims priority of application No. PC2013A0024 (IT), filed on Sep. 13, 2013.|
|Prior Publication US 2016/0193642 A1, Jul. 7, 2016|
|Int. Cl. B21D 37/04 (2006.01); B21D 5/02 (2006.01)|
|CPC B21D 5/0236 (2013.01) [B21D 5/02 (2013.01); B21D 5/0209 (2013.01)]||16 Claims|
|1. A locking device for locking tools in a press brake, comprising:
a first jaw and a second jaw, movable towards and away from each other, and
at least one safety hook interposed between said first jaw and said second jaw provided with a retaining tooth inserted into a groove defined in a shank of a tool, wherein on an inner side of said second jaw facing the first jaw there are a plurality of thrust surfaces cooperating with, while resting slidingly against, a same number of corresponding rest surfaces on an outer side of the safety hook, said thrust surfaces and said rest surfaces lying substantially parallel along corresponding thrust planes sloping in a direction to the first jaw by an angle (α) of between 30° and 60° with respect to a vertical plane, said thrust planes being parallel to and staggered from one another along a substantially vertical direction.