DE2245764A1 - ADJUSTABLE JOINT BRACKET - Google Patents

Description

8880-72

Case No .: 15157
Convention Date:
September l6, 1971

John Anderson Oram, Leighton Buzzard, Bedfordshire, England

Adjustable joint holder

The invention relates to an adjustable joint holder for a load, for example a lamp or a dental one Tray with a support and two or more arms which are hinged to each other and to the support.

In known holders of this type, the load-bearing effect, due to which the load is held, is based on a frictional load the joints between the arms and between the lowest arm and the wearer. To adjust, manipulate or adjust the holder the user uses his arms by exerting a force on them that overcomes the friction in the joints.

There is a conflict between the requirement that the friction must be sufficient to carry the load and the requirement that that the friction must not be so strong that the user can no longer easily adjust the holder.

In some applications, this conflict leads to inadequate support. For example, if a lamp from such a holder on a machine subject to vibrations, is held or carried, if the holder is so designed is that it meets the requirement of effortless adjustability, the vibration have the consequence that the holder increases falls or sinks.

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224576Λ

The invention is based on the task of creating an adjustable joint holder that is easily adjustable and nevertheless is stable enough to carry the load.

An adjustable joint holder with a carrier and an arm articulated transversely thereon is characterized according to the invention net that a drum is attached to the arm and that one is elongated tes flexible element anchored at one end to the carrier and is guided at least once around the drum, such that the Holder, when the flexible element is tensioned and grips the drum, is rigid against load, can be adjusted against it, when the flexible element is relaxed.

In a further development of the invention, the adjustable joint holder consists of an elongated flexible element which is anchored at one end to the bearing and initially around a drum that is attached to a first arm, which is hinged transversely to the carrier at one end, and then via a arcuate guide member attached to a second arm articulated at the other end of the first arm, the arrangement being such that when the flexible element is tensioned it grips the drum, the holder is substantially rigid and a load can be attached to the end of the holder remote from the carrier, while the arms can be rotated about their joints when the flexible element is relaxed, so that the holder can be adjusted. The load is thus held by the flexible element (hereinafter referred to as "rope") and the "grip" of the rope on the drum or on the drum and the curved guide part, which can also be a drum or a rope pulley-like part. It is well known that a ship can be held to the pier by a rope wound once or twice around a bollard and held in place by a worker. The ratio of the force F ₁ in the rope between the ship and the bollard to the force P ₉ exerted by the worker is known to be F ^ / F «= e / ^, where u is the coefficient of friction between the rope and the bollard and 0 is the angle of wrap of the rope the bollards are. Thus, according to the invention, in that the rope is looped around the drum at least once and is tensioned so that it grips the drum,

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the holder is made essentially rigid against the load and can nevertheless be released for easy adjustment by slackening the rope.

The invention is illustrated below with reference to the drawing, for example explained in detail. Show it:

Figure 1 is a partially cut-away side view of a adjustable hinge holder according to an embodiment of the invention;

Figure 2 is a plan view of the first arm of the holder; FIG. 3 shows the arrangement of a rope in the holder;

FIG. 4 shows an arrangement which makes it easier to relax the rope;

FIG. 5 shows a clamping device for the rope which can be released by hand;

FIG. 6 shows a partially cut-away side view of an adjustable hinged holder according to another embodiment the invention;

FIG. 7 shows the arrangement of a rope in the holder according to FIG. 6;

Figure 8 is a partially cut-away side view of a adjustable joint holder according to a third embodiment of the invention; and

FIG. 9 shows the arrangement of a rope in the holder according to FIG. 8.

The adjustable hinge bracket shown in Figures 1, 2 and 3 has three arms 10, 11 and 12. Each of the arms 10, 11 and 12 consists from a piece of hollow pipe, and at the inner ends of the arms each cylindrical drums 13, 14 and 15 of the same diameter attached.

The first arm 10 is hinged with its inner end transversely to the outer end of a tubular support 16 so that it is around a with the axis of the drum 13 is the same horizontal axis pivotable bar. A pivot pin 17 passes through two on the sides of the Plates 18 fastened to the first arm and the carrier 16. The carrier 16 is rotatable about a vertical axis 20 on a base plate 19

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stored.

The inner ends of the second arm 11 and the third arm 12 are similarly hinged transversely to the outer ends of the respective previous arm 10 and 11 so that they are around with the corresponding Drums 14 and 15 coaxial Abhsen are pivotable. The three arms are supported by pivot pins 21 and 22 that are attached to the sides of the arms fastened plates 23 pass through, interconnected.

A flexible wire rope 24 is attached with its inner end to the inside of the carrier 16 by means of a screw and nut 25 anchored. The rope 24 is attached to the first arm 10 through the hollow support 16 and twice in a clockwise direction (as seen in FIG. 1) first drum 13 out. From there the rope 24 runs through the first arm 10, twice clockwise around the second Drum 14, through the second arm 11 and two and a half times around the third drum 15 «From there, the rope 24 is over a small, am Second arm attached to the outer end of the pulley 26 is fed back into the second arm 11.

The cable 24 is then at its outer end with a resilient tensioning device in the form of two parallel in the second arm 11 attached springs 27 connected. Two springs are there as a safety measure provided in the event that a spring breaks or breaks. The springs 27 are with one end on the rope 24 and with. the other end attached to the second arm 11 at the second drum 14 so that they tension the cable and this the drums engages. The type of cable guide is shown in FIG.

To relax the rope by hand, the one shown in FIG Device be provided. A relaxation rope 28, which is nit I eeinea one end aa outer end of the rope 24 at the one »

Place where the rope 24 ″ is connected to the springs 27 is, is backwards over the pulley 26 and then forward on the outside of the second macaw 11 towards the first Era 10 led. The outer end of the relaxation rope 28 is on a second era 11 slidably attached DauaenatUck 29 attached. Aa second era 11 between the Dauaenstttck 29 and the

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second drum 14 a fixed finger piece 30 is attached. By moving the thumb piece 29 against the finger piece 30 thus the springs 27 are stretched and the cable 24 behind the third drum 15 is relaxed.

Normally, the tension exerted by the springs 27 causes the cable 24 to frictionally grip the three drums or captured. When the third arm 12 at its outer end through for example a load 31 is loaded, the moment of the load 31 and the arm 12 around the pivot bearing 22 causes the rope 24 the third drum 15 grips even more tightly, so that the tension in the rope between the second drum 14 and the third drum 15 increases until the moment of tension that of the load 31 outweighs. Likewise, the tension between the first increases Drum 12 and the second drum 13 and between the anchorage 25 and the first drum 13 to the same extent as the rope 24 grips the drums tighter. The arms 10, 11 and 12 are held in place in this way. .

If the angle of the arms is to be adjusted, the rope 24 be relaxed at least somewhat so that the rope 24 can slide over the drums 13, 14 and 15. By supporting the load 31 and relaxing the springs 27, the arms can be adjusted. When the arms are in the desired new positions, can the rope 24 through the springs 27, the changes in the length of the rope 24 between the anchorage 25 and the third drum 15 allow due to the adjustment, tensioned and the load released. The rope tension then holds the arms in their new one Location.

For a constant angular position of the arm 12 care relative to the carrier, so that for example one on the third The lamp attached to the arm 12 always shines in the same direction or a tray always remains level, even if the height of the Lamp or tablet is changed.

In order to ensure this constant angular position inevitably, can the third arm 12 come with a clamping device? be prepared that the rope 24 is releasably attached to the third drum 15

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clamped as shown in FIG. The clamping device consists of a thumb screw 32 on the third arm 12, 'which a Reibunpskissen 33 presses against the drum 15 so that the cable is clamped. The friction pad is attached to one end of a lever 34, which is articulated at its other end to the third arm 12.

A simpler embodiment of the hinge holder is shown in FIG Figures 6 and 7, where the same parts are denoted by the same reference numerals as in the previous figures. At this Embodiment only two arms 10 and 11 are provided. The arm 11 is in turn articulated transversely to the carrier 16 by means of the pivot pin 17 passing through the carrier 16 and the plates 18.

The arm 11 is in turn at the outer end by means of the pivot pin 21 passing through the arm 11 and the plates 23 on the arm 10 of the arm 10 articulated.

A dental tray 35 is attached to the arm 11 in the manner shown, and the wire or steel cable 24 anchored to the support by means of the screw 25 runs twice around the drum 13 on the arm 10, partly around a curved guide part attached to the arm 11, which likewise has the shape of a drum or a rope disk-like part, and is finally attached to the tray 35. Figure 7 shows the arrangement of the rope 24

There is also a rigid link rod 37 at one end thereof by means of a pivot pin 38 on the drum 14 and at its other end by means of a pivot pin 39 on the carrier 16. The hole penetrated by the pivot pin in at least one and preferably both of the components 14 and 16 is somewhat oversized to allow for a certain backlash.

In use, the arm 11 and the tray 35 tend to rotate clockwise (in FIG. 6), whereby the rope 24 is tensioned and the drum 13 engages. The holder is then rigid against load. The length of the rope is dimensioned so that the Tray 35 is horizontal and the articulated rod 37 does not bear any of the load,

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22Α576Λ

To adjust the holder, you simply tilt the tray 3 5 a little in the counterclockwise direction, with the dead. Corridor in the Joints of the toggle rod allow such a tilt over a small angle that is sufficient to relax the rope, so that the arm 10 is pivoted up or down on the pivot pin 17 can be. At the same time, the arm 11 pivots accordingly on the pivot pin 21 and holds the tray 35 in the horizontal position.

A modification of the embodiment of Figure 6 and ¹ J is shown in Figures 8 and 9, where partially out the toggle link 37 is removed in Figure 6 and, instead, the cable 24 halfway around the drum 14 'to the drum 13 and by means of a strong spring. is anchored on the carrier 16. The tension of the spring supplements the pulling effect given by the force of gravity: the tray, so that the rope is tightened even more. The rope is firmly clamped to this drum by means of a clamp 41 provided on the drum 14.

In order to relax the rope for adjusting the holder, one simply lifts the tray 35 against the tension of the spring 40, whereby the grip of the rope on the drum 13 is loosened and the holder can be pivoted.

3GM12 / Gt7

Claims (14)

- 8 claims ! ^ Adjustable joint holder with a carrier and a arm articulated transversely thereon, characterized in that a drum (13) is attached to the arm (10) is and that an elongated flexible element (24) with its one end (2 5) anchored to the support (16) and at least once around the drum (13) is looped so that when the flexible element is tensioned and grips the drum, the holder against Load is rigid, but can be adjusted when the flexible element is relaxed. 2. Joint holder according to claim 1, characterized in that that at the end of the first arm (lO) remote from the carrier (16) a second arm (ll) is hinged transversely is (21) and that the flexible element (24) is guided over a curved guide part (14) attached to the second arm (H). 3. Joint holder according to claim 2, characterized in that the anchorage (2 5) on Support (16) distal end of the flexible element (24) anchored to the second arm or to a component attached to the second arm (3 5) and that the tensioning of the flexible element by the action of gravity on the second arm plus that of this carried load takes place (Figures 6 and 7). 4. hinge bracket according to claim 3, characterized in that a rigid connecting rod is articulated (37) with its one end on the second arm and with its other end on the support (16), wherein at least one of the articulation points having a certain backlash, which is a Relaxation of the flexible element for adjusting the joint holder allows (Figure 6 and 7). 5. hinge holder according to claim 2, characterized in that the anchoring (2 5) on the 309812/0978 ■ - 9 - The end of the flexible element (24) remote from the carrier is anchored to the carrier by means of a tension spring (40), which supplements the force of gravity when tensioning the flexible element, and that a device (41) is provided for clamping the flexible element on the curved guide part (14) , so that the part of the flexible element which extends from the guide part (I4) backwards around the drum (13) to the first anchorage (25) can be relaxed by pivoting the second arm (11) about its pivot bearing for adjusting the joint holder (Figures 8 and 9) 6. Joint holder according to one of claims 2 to 5 »characterized in that the radii of curvature of the guide part (14) tindder. Drum (13) essentially are the same. 7. joint holder according to claim 6, characterized in that that the axes of curvature of the drum (13) and the guide part (14) essentially with the axes the pivot bearing (17 and 21) of the first arm on the carrier or the coincide with the second arm on the first arm. 8. joint holder according to one of claims 2 to 7, characterized in that the curved Guide part (14) has a pulley-like shape. 9. joint holder according to claim 2, characterized in that at the end of the second arm (11) remote from the first arm (10), a third arm (12) is hinged transversely, that the curved guide part (I4) has a second drum around which the flexible element (24) is looped at least once, and that a second curved guide part (15), over which the flexible element (24) is guided, is attached to the third arm (12) (Figures 1 to 5). 10. Joint holder according to claim 9> characterized that the radii of curvature of the first drum (13), 'the second drum (14) and the curved Fülurunga- 309812/0978 22A5764 partly (15) are essentially the same on the third arm (FIGS. 1 to 5). 11. Joint holder according to claim 10, characterized in that the axes of the first drum (1.3), the second drum (14) and the provided guide part (15) on the third arm essentially coincide with the axes of the pivot bearings (17> 21, 22) coincide between the first arm and the carrier, between the second arm and the first arm and between the third arm and the second arm (Figures 1 to 5). 12. Joint holder according to claim 9, 10 or 11, characterized in that the end remote from the carrier of the flexible element (24) by means of a tension spring (27) on the second Arm is anchored (Figures 1 to 5) 13. Joint holder according to claim 9, 10, 11 or 12, geke nnzeich by a device (33) for clamping the flexible element (24) on the second curved guide part (15) (Figure 5). 14. Joint holder according to one of claims 9 to 13 *, characterized in that the second curved Guide part (15) is a drum around which the flexible element (24) is wrapped at least once. 15 · Joint holder according to claim 12, marked et by a device (28, 29, 30) that relaxes the flexible element facilitated. l6. Hinge holder according to one of the preceding claims, characterized in that the flexible element (24) is a steel cable. 30S8t2 / 09? § ff Blank page