INTERCONNECTING MEMBER -1
The present invention relates to an interconnection arrangement for power cylinders or rodless cylinders for the interconnection of a guide rail and a cylinder, and more exactly to an inter¬ connection arrangement designed as an uniform opposite positioned interconnecting member.
In the use of power cylinders or rodless cylinders there is a general demand of being able to interconnect, into a compact package, a power cylinder or a rodless cylinder and a guide rail.
A known rodless cylinder having an arrangement for the inter¬ connection of several power cylinders is disclosed by the Swedish Patent SE 458874 in which the power cylinders are interconnected by means of two identical but mirrored members using a pair of T-shaped grooves on each side of the cylinders. This demands that each interconnecting member must in its total length be pushed into the corresponding T-shaped groove along the full length of the power cylinder and then separately be locked to prevent any type of displacement action.
From SE 461 746 is disclosed an interconnection of a power cylinder and a guide rail by means of two separate interconnect¬ ing members. Interconnecting devices consisting of two portions like those in SE 458874 and SE 461746 also do have the drawback that the members may each vary in measure in relation to the other resulting in an unsatisfactory interconnection due to that in such a case not being able to fully ensure that the intercon¬ necting members will not be inclined in relation to each other.
In an additional document SE 462 402 is demonstrated, on each side of the power cylinder, a similar but single T-groove having arched bottom surfaces to leave space for locking screws being clamped through the interconnecting device put into the T-shaped groove in the same manner as in the previous discussed Patent.
Another British document GB-A-2 156 480 discloses a power cylinder having longitudinal flat supporting faces with or without longitudinal grooves into which attachment means may be pushed in a similar way as previously mentioned, whereby a protruding trapezoidal projection is formed, if present between two such longitudinal grooves. However, this design does not permit a fully symmetrical interconnection of the power cylin¬ ders.
In connection to this may also incidentally be mentioned a German document DE-2939422 disclosing a cylinder block having several to each other interconnected cylinders at the ends of which there are interconnection elements allowing, as to the rest, round cylinders to be interconnected. These cylinders furthermore are provided with a piston rod and do not actually have anything in common with the technical field concerning power cylinders or rodless cylinders in arrangements for linear motion.
Today there is no really simple and efficient device available, in a stable way into a compact package, to interconnect devices like two or more power cylinders or rodless cylinders, alterna¬ tively a power cylinder or a rodless cylinder and a guide rail. Among other thing there is a demand of a means which does not have to be pushed along the side of the full length of grooves in power cylinders, but may in a simple way be attached and released from the side along its full length but still providing an absolute fixing of the devices to each other and at the same ■fcime the interconnecting device must use a minimal space, as the demand is to connect the devices in a close relationship to each other.
Description of the invention
The present invention does solve the previous mentioned drawbacks byproviding an interconnection arrangement offering interconnec¬ ting means having a uniform contact surface for a paired inter¬ connection of a guide rail and a power cylinder or a rodless cylinder without any risk of displacement in any direction
between the devices.
According to the present invention there is provided an intercon¬ nection arrangement which does not have to be pushed along the power cylinder or the rodless cylinder at the time of intercon¬ nection but are simply fitted straight from the side.
Additionally the present invention provides an interconnection arrangement with uniform contacting interconnecting means having towards each other facing paired parallel projections which fit into corresponding grooves in the power cylinder or the rodless cylinder and being simply clamped by a number of clamping screws accessible from a free face of the interconnection arrangement, the paired to each other obliquely facing parallel projections will due to shearing lock into the grooves of the power cylinder at the same time when the guide rail by means of the clamping screws is attached to the interconnection member.
The present invention furthermore provides an interconnection arrangement having one in the guide rail fitted central recess, a protrusion running in the top face of the interconnecting member and provided with threaded holes having predetermined intervals corresponding to holes in a guide rail for the fitting of the guide rail to the interconnecting member, which from the manufacturing point of view offers a fixing means between the guide rail and the interconnecting member, which is simple to produce.
Furthermore the interconnection arrangement according to the present invention provides a thin interconnecting means allowing the power cylinder or the rodless cylinder and the guide rail to be interconnected closely together.
Description of the drawings
The invention will be described below in a preferred embodiment by means of the attached drawings where corresponding parts are given the same reference numbers and in which:
Fig. 1 is a perspective view of a linear power assembly having a guide rail and a cylinder interconnected by an interconnecting member according to the present in¬ vention, and
Fig. 2 is a front end view of the power assembly of Fig. 1 showing the interconnecting member according to the invention.
A preferred embodiment
Fig. 1 is demonstrating in a perspective view a preferred embodiment of a linear power assembly having a cylinder 1, an interconnecting member 10 and a guide rail 30. Additionally a slider may be moved along the guide rail.
The interconnecting member is made as a structural shape extending along the full length of the cylinder and the guide rail. Furthermore the interconnecting member is provided on its upper face with a central, essentially squared shaped protrusion 20 running along the interconnecting member. The protrusion 20 is provided with threaded holes 17 which in relation to each other have predetermined intervals along the protrusion. Furthermore is illustrated in Fig. 2 that the upper face of the interconnecting member additionally symmetrically on each side of the protrusion has upwardly facing surfaces 21 and 22. The surfaces 21 and 22 are designed such that each of the surfaces is sloping somewhat inward towards the protrusion 20 with an angle of a few degrees to the plane parallel to the upper surface of the protrusion 20.
The interconnection member has a width approximately correspon¬ ding to the width of the cylinder or the width of the guide rail and the width is such that the interconnecting member does not constitute any obstacle for the slider along the guide rail.
In its downwardly facing surface, in Figure 1 and 2, the inter¬ connecting member presents an undercut longitudinal groove 18. On the remaining portions of the bottom surface at each side of
the undercut groove there are along the full length of the interconnecting member two to each other obliquely directed projections 14a and 14b intended for fitting into parallel grooves 4 of a cylinder 1. On each side of both the projections 14a and 14b there are supporting surfaces 15a and 16a, respec¬ tively 15b and 16b.
Due to the cut portions 18a and 18b, respectively, in the undercut groove 18 and slightly sloping surfaces 21 and 22 there is created a possibility for the projections 14a and 14b to slightly move towards each other when the interconnecting member 10 is fixed to the guide rail by means of the threaded holes 17 in the protrusion 20 and with the threaded clamping means through the corresponding holes in the guide rail. When the clamping means are further tightened the protrusion 20 is further moved into the corresponding recess in the guide rail and due to the slightly sloping surfaces 21 and 22 projections 14a and 14b will be slightly displaced in a direction towards each other due to the thin material created underneath the sloping surfaces 21 and ■22 by the undercut portions 18a and 18b, respectively, enabling the small displacements of the bottom portions of the intercon¬ necting member having the projections 14a and 14b.
The surfaces 15a and 16a, respectively 15b and 16b constitute supporting surfaces which are resting against the cylinder 1 when the projections 14a, 14b are inserted into the grooves 4. Due to its configuration the interconnecting member 10 does not moreover demand that the cylinder presents a flat surface for the inter¬ connection with a guide rail, but the cylinder is permitted to even have, e. g., a cylindrical form whereby essentially only the supporting surfaces 15a and 15b will constitute the supporting surfaces resting against the cylinder.
By influence of the supporting surfaces 15a, 15b and the pro¬ jections 14a, 14b the interconnecting member will securely engage the grooves 4 of the cylinder when the clamping means within the threaded holes 17 of the protrusion 20 are further tightened.