DE1756262A1 - Vacuum hoist with self-switching (II) - Google Patents

Description

"Vacuum hoist with self-switching" (II) is the subject of the main patent application -is a vacuum lifting device, which consists of a cylinder-piston arrangement, an actuated during the downward movement of the piston rod, connected to this automatic switching device, which is arranged in an axial bore of the piston rod and in a known manner of two, with their ring gears each other facing, with respect to their teeth offset against each other tooth sleeves with shiftable and rotatable switching cylinder with guide pin therein, the tooth number of the lower, longer tooth sleeve alternately having different tooth depths and at the lower end of the switching cylinder a rotatable valve plate guided in this with a sealing washer is attached.

The additional invention has set itself the task of the subject the main patent application to improve and constructive further training.

An automatic switching device is used to solve this problem proposed that consist of a one-piece tooth sleeve with an upper and lower Gear rim and a shift cylinder that can be adjusted in height and rotated consists of an upper and a lower guide pin.

The upper toothed ring of the toothed sleeve has alternately different Tooth depths, while the lower tooth rim is opposite to the same depth of tooth gaps owns.

The upper guide pin of the shift cylinder works with the upper one Gear rim of the tooth sleeve together, while the lower guide pin into the tooth gaps of the lower ring gear engages.

The new design of the automatic switchover is more advantageous than that switching device previously described and used. With the subject of the main patent application it was necessary to press two tooth sleeves into the axial bore of the piston rod, whereby the correct position of the teeth to one another had to be taken into account.

The correct mutual arrangement of the sleeves or those facing one another The ring gear sometimes caused difficulties. According to the proposal of the additional invention a one-piece tooth sleeve is used in an advantageous manner, in which the Position of the individual teeth to one another was already taken into account during production and is firmly established. The assembly of the switching device according to the invention has thus been made considerably easier. Also in terms of production result advantages. The invention is described in detail below with reference to three figures illustrated: Figure 1 is a side view of the switching device, Figure 2 is a plan view according to line II-II of Figure 1 and Figure 3 shows a development represent.

The toothed sleeve 38 proposed according to the invention is designed in one piece. It has an upper ring gear 4oa and a lower ring gear 4ob. The upper Gear rim 4oa alternately has different tooth depths, while the lower one Toothed rim 4ob has tooth gaps of the same depth. In the toothed sleeve 38 is a shift cylinder 41 arranged to be movable up and down and rotatable. This is with an upper guide pin 42a and a lower guide pin 42b. The sealing valve disc with sealing washer has the reference symbol 43.

The new device according to the invention works in such a way that-starting from a starting position shown by the drawing-when putting on the Cylinder-piston arrangement, first of all, the valve disk 43 with the shift cylinder 41 and then the toothed sleeve 38 extends even further together with the piston rod lowers. The upper guide pin 42a comes into the area of the teeth of the upper ring gear 4oa. At the same time, the lower guide pin 42b enters the Area of the teeth of the lower ring gear 4ob. With a further lowering of the tooth sleeve is effected by the lower guide pin 42b in conjunction with the lower gear rim 4ob a counterclockwise rotation of the shift cylinder 41. Will the cylinder piston.

The arrangement is then raised again, so the upper one falls or slides Guide pin 42a into the next, less deep tooth gap. That Changeover valve is now open, and when lifting the assembly the load is not taken. When the arrangement is set down again, lower Guide pin 42b and lower ring gear 4ob again a counterclockwise rotation, the upper guide pin 42a is moved over a tooth of the upper ring gear 4oa or lifted and falls or slides when lifting the arrangement into the neighboring, deep tooth gap. The valve is closed because the valve disc is now opening locks. When the cylinder-piston assembly is raised, a vacuum is generated and thereby the flat load is raised. It is advantageous to use the shift cylinder 41 fairly difficult to train so that it always slides down and not through a viscous one or resinifying lubricant is prevented from moving downwards due to static friction will.

Claims (3)

P a t e n t a n s p r ü c h e 1. Vacuum hoist, consisting of a cylinder-piston arrangement with one during the downward movement of the piston rod actuated automatic switching device arranged in an axial bore of the same according to patent application G 48 369 XI / 35b-Tr. A.-. characterized in that this from a one-piece tooth sleeve (38) with an upper and lower tooth ring (4oa, 4ob) and a shift cylinder (41) which can be adjusted in height and rotated therein an upper and a lower guide pin (42a, 42b). 2. Unterduckhebezeug according to claim 1, characterized in that ßer upper ring gear (4oa) of the tooth sleeve (38) alternately different tooth depths, the lower ring gear (4ob), on the other hand, has tooth gaps of the same depth. 3. Vacuum hoist according to claims 1 and 2, characterized in that that the upper guide pin (42a) of the shift cylinder (41) with the upper ring gear (4oa) the toothed sleeve (38) cooperates while the lower guide pin (42b) engages in the tooth gaps of the lower ring gear (4ob).