Window opener

In an opening device comprising a toggle lever joint comprising two levers which are attached at respective ends to an openable part and to a stationary part respectively and are permanently pivotally connected at other ends of the levers to each other forming a permanent single pivot, via a toggle joint having a detent mechanism and a pivot pin passing through the two levers, the detent mechanism comprising at least one detent disk mounted displaceably in an axial direction of the pivot pin and operatively disengagable from one of the levers against spring force and connected non-rotatably to the other of said levers, said detent disk having face surfaces and axially projecting detent elements distributed on one of the face surfaces, said detent elements cooperating with corresponding detent parts respectively of said one lever in respectively engaged conditions such that the openable part can be held fixed in various open positions relative to said stationary part, the improvement comprising

• a grip receiving said detent mechanism and said pivot pin comprising two coaxial short grip arms which project laterally on both sides from said one lever in the axial direction of said pivot pin,
• means comprising a push button for operatively disengaging said detent disk from said one lever by pushing said push button such that said detent elements disengage from said detent parts of said one lever, said push button being arranged axially displaceably in one of said grip arms for said pushing, and
• said disengaging means further comprises said pivot pin, said pivot pin being axially displaceable in said grip, said pivot pin engaging at one end thereof said push button and at another portion thereof said detent disk,
• said first-mentioned respective ends are freely pivotally connected to said stationary and openable parts respectively but axially immovable relative thereto,
• said two levers have said detent parts forming a plurality of closed detent holes, said detent elements of said detent disk are in engagement in said engaged conditions with respective said detent holes in both of said two levers,
• said levers are U-shaped and have U flanks on both sides of said detent disk, said detent holes are formed in said U flanks, and
• said levers are axially immoveable at said toggle joint, said U-flanks of one of said levers overlying and abutting respective said U-flanks of said other lever and defining thereat coaxially aligned openings, said pivot pin extending axially displaceably but nonremovably through said aligned openings.