DE19532035A1 - Lock for hydraulic saw with piston, cylinder tube and cylinder head - Google Patents

Abstract

The damper (7) is coupled to the piston (1). It can move in a coupling chamber (3) in the cylinder head (6). There is also a transverse bolt (85), engaging or disengaging the coupling chamber under the action of liq. or mechanical device, thus affecting the locking and unlocking of the damper. The liq. or mechanical device pref. consists of an auxiliary cylinder (81), forming with the cylinder head an extra chamber (C2) for a locking piston (82) coupled to the transverse bolt, and a spring (84) for the locking piston. An outer handle (86) is coupled to the transverse bolt, while the locking piston is affected by the liq. circuits (62).

Description

This invention consists of a mechanical Locking device used in compressed air, hydraulic and industrial pneumatic cylinders to different Purposes (e.g. to change the position of a Stage to them different applications or needs adapt that require a change of position) can be used.

One specific application is for a double-acting one Cylinder, the two movable pistons in each Holds the cylinder tube in the opposite position with opposite ends of a rack are connected to a system of sliding pinions / racks belongs in a bushing / guide of a center housing, into which the cylinder tubes mentioned are installed.

The mechanical locking device, which according to the Invention in compressed air, hydraulic and pneumatic cylinders the following cannot be used in industry known features:

• a) the device is integrated in the cylinder head and forms a compact unit with it;
• b) a manual emergency release is available;
• c) when the piston has finished its stroke, it will from the locking device automatically detained;
• d) remains in the absence or failure of the drive fluid he cylinder immobile;
• e) Drive fluid under pressure unlocks the Locking system and allows the piston movement.

Fig. 1 is a cross section of a practical embodiment of the mechanical locking device according to the invention, applied to a cylinder with two pistons and rack.

Fig. 2 is a general schematic
Floor plan to the previous illustration.

The following insert parts are on both illustrations recognizable:

1 piston
2 cylinder tubes
3 racks
4 sprockets
5 middle housing
6 cylinder heads
7 dampers
8 locking / unlocking device

According to the invention and the embodiment shown, the central housing ( 5 ) has two cylinder tubes ( 2 ) in a coaxial arrangement, each of which has a cylinder head ( 6 ) at its free end.

The middle housing ( 5 ) also has bushings ( 51 ), which are arranged in a passage opening ( 52 ) coaxial to the cylinder tubes ( 2 ), and a bearing ( 53 ) in which a pinion ( 4 ) connected to an output shaft ( 41 ) ) is located.

In the bushes ( 51 ) a rack ( 3 ) is moved which, engaging in the pinion ( 4 ), linearly in the direction (F₁) by the hydraulic action of the liquid circuit with inlet / outlet ( 61 ) on the cylinder heads ( 6 ) is moved - cf. Fig. 1.

The rack ( 3 ) carries pistons ( 1 ) at each end, which move in the respective cylinder tubes ( 2 ).

Each piston ( 1 ) has in a coaxial arrangement a damper ( 7 ), both of which move together in the respective chamber (C₁), which is defined as a continuation of the corresponding cylinder tube ( 2 ) and through the cylinder head ( 6 ) on one side .

Each cylinder head ( 6 ) also has a locking / unlocking device ( 8 ).

According to the embodiment shown, each device ( 8 ) consists of:

• - an additional cylinder ( 81 ),
• - a locking piston ( 82 ),
• - a plunger ( 83 ),
• - A cross bolt ( 85 ) and
• - a handle ( 86 ),

which are all mounted coaxially and are held by a spring ( 84 ) in an additional chamber (C₂) in the (locking) position, which is defined by the cylinder head ( 6 ) itself and the additional cylinder.

Each additional chamber (C₂) is connected to the chamber (C₁) at least via a line ( 62 ) which runs in the cylinder head ( 6 ).

Each damper ( 7 ) is provided on the head ( 9 ) with a circumferential recess ( 71 ) and a chamfer / bevel ( 72 ).

Each bolt ( 85 ) in turn has a recess ( 85 b) and a bevel ( 85 a) that match the previous ones ( 71 ), ( 72 ).

The following applies to this structure:

• a) When a piston ( 1 ) completes its stroke, the head ( 9 ) passes through the connecting chamber (C₃), and the chamfer ( 72 ) reaches the chamfer ( 85 a) of the cross bolt ( 85 ), which lowers. The head ( 9 ) protrudes above the cross bolt ( 85 ), which then rises under the action of the spring ( 84 ), its recesses ( 71 ), ( 85 b) engaging.
• b) When liquid is supplied under pressure, it unlocks the cross bolt ( 85 ) and enables the piston ( 1 ) to move, since the liquid pressurizes the piston ( 82 ) via the line (s) ( 62 ), whereby the spring action ( 84 ) is overcome.
• c) In the absence or failure of the liquid can be unlocked manually by pulling the cross bolt ( 85 ) from the handle ( 86 ) and thus overcoming the spring action ( 84 ).

Claims (5)

1. Locking device for cylinders with hydraulic action, each consisting of a piston ( 1 ), cylinder tube ( 2 ) and cylinder head ( 6 ), characterized by a damper ( 7 ) which is connected to the piston ( 1 ), and which in a connecting chamber (C₃), which is provided in the cylinder head ( 6 ), can move, wherein in the cylinder head ( 6 ) there is a cross bolt ( 85 ) which engages under the action of liquid / mechanical media in the connecting chamber (C₃) or can be led out of it and thereby enables the locking / unlocking of the damper ( 7 ) therein. 2. Locking device for cylinders with hydraulic effect according to the preceding claim, characterized in that the liquid / mechanical active media on the piston ( 85 ) consist of the following:

• a) an additional cylinder ( 81 ) which with the cylinder head ( 6 ) forms an additional chamber (C₂) in which there is a locking piston ( 82 ) in connection with the cross bolt ( 85 ) and a spring ( 84 ) on the locking piston ( 82 ) works;
• b) an outer handle ( 86 ) connected to the cross bolt ( 85 );
• c) liquid circuits ( 62 ) which act on the locking piston ( 82 ).

3. Locking device for cylinders with hydraulics effect according to the preceding claims, characterized by doing the following: a) the damper ( 7 ) consists of a head ( 9 ) into which a circumferential recess ( 71 ) and a chamfer ( 72 ) is incorporated, b) the bolt ( 85 ) consists of a recess ( 85 b) into which the circumferential recess ( 71 ) fits, and a chamfer ( 85 a) belonging to the chamfer ( 72 ) of the damper ( 7 ).