DE1659105A1 - Spacers and method and device for attaching them to rebar - Google Patents

Description

DIPL. ING. DIETRICH LEWALD 8 MUNICH IS I VVV I vO

BIRKAOER STBASSX FATEICTANWAItT

873837 TELEPHONE

93,087

JÄRKVBRKS AB, Halmstad, 3ehv; eden

Spacers and the method and device for their Attachment to rebar

The invention relates to spacers and, in particular, to methods and devices for attaching them to reinforcing iron.

Ss is known to use spacers on rebar or Reinforcing bars, hereinafter referred to as reinforcing bars, to be attached to these bars at a sufficient distance to keep from the formwork wall. Bisner had to use these spacers however, can be attached by hand or via primitive tools, so that the decision regarding the design of the spacers had to be largely subordinate to mounting considerations, which i.a. led to the fact that the spacers could not be given the shape required for the desired function was most suitable. Am © of the main properties of the spacer should it be that he has no tendency to

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striking or pointing to an edge, i.e. its main plane should always be perpendicular to the longitudinal axis of the reinforcement iron stretch despite loads. But this requires a relatively large thickness of the spacer, at least completely in the The double cone with a large cone angle would lie in its central bore and if possible a cylindrical intermediate part would therefore be a very suitable shape; Spacers with soleh a shape would also be advantageous from the point of view of adjustment and with regard to the question of cost. However, such a spacer can be used on the rebar not applied to ground without being slotted from the outer edge inwards towards the central hole. This slicing can advantageously take place in connection with the attachment, for what good tools are required.

According to the invention this attachment is carried out so that the spacer with its main plane the longitudinal axis of the reinforcement iron essentially below the right ¥ angle on the Cuts where the spacer should be attached so that the spacer is moved to this point, that a cutting element in the ¥ eg of the spacer such is introduced that the spacer during its transport is slotted essentially along a Sadialplane that the cutting element is then removed and the Spacer is pressed against the rebar while the iron is held in place, such that the

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BATH ORIGINAL

Spacer is open to the slot, and that the spacer finally concentric in one end position is moved to the reinforcement rod, causing the slot in the Spacers closed because of the elasticity of the material ^. 'IΓd.

jie device for carrying out this method is essentially characterized by a magazine for the horizontally stacked spacers; a member for running the lowermost spacer from the stack during each new working cycle ¹ , means for rotating the spacer in a vertical position and for directing it towards the lower, open end of the device, this end being arranged in such a way that the position of the device and of the reinforcement iron is set against each other in such a way that the main plane of the spacer or of its extension intersects the longitudinal axis of the reinforcement iron essentially at a right angle, and that the diametrical plane through the spacer runs essentially through this axis; that means for detecting and Holding the reinforcing iron at the lower end of the device are provided as well as other means for conveying the spacers down against the reinforcing iron; and by a cutting element (knife), which is arranged in the extended liaraetral plane of the spacer, this plane passing through the longitudinal axis

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of the rebar and then this cutting element is traceable to the slots of the spacer on one side of the central bore, the means for separating a spacer from the stack, for gripping and holding the reinforcing iron, for conveying the spacer down against the rebar and for removing the cutting element against the spring action by mechanisms are operated for which a common operating means is provided.

An embodiment of a fastening device according to the Invention will now be explained in more detail with reference to the accompanying drawings, in which the

Figures 1 and 2 show the device in two side views, each at right angles to one another;

FIGS. 3, 4 and 5 show details of the device shown in FIGS.

The main part of the device consists of a steel tube 1, which is arranged vertically in the operating position, the upper part of which is a magazine for the spacers 2 made of plastic forms, which are arranged one above the other. The spacers have the shape of narrow double cone elements a cylindrical part in the middle and a central bore which is adapted to the cross-section of the reinforcing iron and of hub-like flanges that run the length of the hole

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BATH ORIGINAL

and thus increase the stability of the attached spacer. The lowest spacer rests on a spring 3 or a spring-loaded arm that extends up to the spacer through an opening in the pipe, as well as on one formed in the pipe by the outwardly bent edge 4 of a partition 5 Paragraph, this' ./and in the lower part of the tube is inserted and is slightly inclined to the vertical. Partition wall and pipe wall form together with a flat wall 5a, which replaces a piece cut off from the pipe wall, an outwardly tapering channel 6 for the spacers, which one after their separation from the stack in vertical Drops down through the canal.

Purely operating and regulating the various mechanisms provided in the device, a rod 8 is arranged outside the tube 1, which can be moved in a guide 7 parallel to the axis of the tube in the longitudinal direction. The upper part of the rod is provided with teeth 8a, with which a gear 9 rigidly mounted on a V / elle 10 meshes, the shaft being rotatably mounted in two journal bearings firmly connected to the pipe * A lever 12 is attached to the shaft 10 »By means of which the äa'mrad 9 can be rotated v / earthed, whereby the rod ö is displaceable in the longitudinal direction. At the upper part of the koii /.- it, parallel ZNV oscillating plane dea lever 12, a handle Y5 is rigidly secured, gehsltniii through which the device with a hcnü in Betriet and Hal ^ l 12 sit * © r other

0Ö9S52 / 0734

Hand operated. By moving the lever from the position shown in Mg. 1 in a rain-clockwise direction along a Semicircle, the rod 8 is pressed down over a distance required for different functions.

In the upper rope of the rod 8, below the teeth, is a yuerhaupt 14 attached to which the upper .uaide of a handlebar 15 is hinged, which at the lower iinde in a similar ..eise is connected to the upper Bndteil a delivery piston 16, which works in a fixed guide 17 outside the liohres and protrudes inwardly downward through a slot in the wall. The lower iinde of the delivery piston 16 is standing inward above the edge of the lower spacer in front of the magazine; after downward movement of the rod 8 in the above described manner, the lowermost spacer is released by the piston against the Y / irkung of the spring 3 and falls into channel 6 while the spring is reset and the piston prevents the next spacer from falling.

Before the spacer, which slides down through the channel 6, can be attached to a reinforcing iron 1ö, which is held against the lower end of the tube 1, the spacer must be slotted through a radial slot. The one to eat the spacer against a knife, to remove it of the knife against spring action and for pressing the

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Stand holder on the reinforcing iron, provided mechanism is also actuated by the rod 8, which occurs at this ^ weck at the lower end via a bearing 19, a pressure piece 20. Eei downward movement of the rod 8, this pressure BtUCi: is guided by pins 21 (Pig. 5) against the edge on fixed curves with such a movement towards the channel that a gripper 23 with a recess 23a on the edge, which is at the lower end of the pressure piece is integrally formed or fastened, the edge of the spacer comprises and when it moves downward presses the spacer with its lowermost part against the / lesser k4. The knife handle, designed as a piston, slides in a transverse guide 2b and is usually held in the working position by springs 26, in which it extends into the channel 8 and pressure piece 20 is achieved in such a way that an inclined surface 20a on the latter interacts with a corresponding inclined surface 27a on a pivoting handle 27 connected to the knife handle, this arm removing the ilever upon passage of the spacer. The pressure piece 20 with the gripper 23 can move the spacer downwards against the reinforcing iron 18 and press the spacer on it, which is done by the fact that the slot is opened due to the pressure, its edges slide over the rail and by resilience

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BAD ORIGIWAL

the slot in the material closes as soon as the spacer has assumed the desired radial position.

To achieve that the rebar 18 in a wuerrichtung assumes a straight position to the reinforcement iron, two recesses or cutouts 28 are, for example, semicircular or V-shape diametrically opposite in the lower i & ide des Hohres provided, the connecting line of the recesses running in the plane containing the shorter cross-sectional axis of the channel 6 according to the thickness of the spacers. When operating the device, the reinforcing iron are guided into the cutouts 28 and held therein. For this purpose, the device is at the bottom with a pair of ■ ÜHihrungsarmen 29 provided, which taper at the free end and are mounted with little reciprocation. These arms can hang down somewhat from the position shown in FIGS. 1 and 3, with their front end under that with a Spacer grips to provided rebar; its upper edge leads the device with the cutouts 28 against the Rebar. To set the reinforcement bar against the During operation of the device, when the rod b moves downward, a protruding part 30 moves from the head 14 against and along an arm 31 on an angle lever, which is mounted on a fixed part relative to the tube 1. A link 33 is provided by a second arm 32 on the angle lever raised, the lower end of which on an arm 34 of a second

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ORIGINAL INSPECTED

Angle lever, which is stored in the lower part of the device is hinged. The second arm 35 of the last-mentioned angle lever is articulated on a crosshead 37, the two clamping rams 36 rigidly connects. The end of the piston is partially beveled; the pistons are movable stored at the lower ünde of the device, so that upon downward movement of the rod 8 it through the described Transmission elements with their beveled end up being pressed against the underside of the reinforcing iron 18 and this Wedge during the entire workflow (Fig. 3).

When lever 12 is moved downwards (clockwise in Fig. 1) the mentioned mechanisms are reset to their original position, the Hesser by the spring action, the others Forced Movement Mechanisms. The clamping ram 36 v / earth moved to the side by the protruding part 30 against a third arm 38 is moved on the associated bell crank. The pressure piece 20 with the gripper 31 is to the side from the Channel 6 pivoted, a spring, not shown, can be arranged in the rest position of the gripper and in a groove 23b take hold of the upper edge of the hook.

To load the device with new spacers, the spacers can expediently be arranged on a rod be that the magazine is filled in the simplest possible way. To improve the promotion down came, a weight was added vverdöii,

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The rod must of course hold the spacers so that they are easy to separate; Of course, the rod can also be refilled from the magazine with the spacers be pulled out.

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Claims (1)

- 11 PATENT CLAIMS 1. 1 spacer for rebar with a central drilling junction =: «-To apply to reinforcing iron, thereby marked :: dedicates, that the spacer (2) is made of plastic and a doppelkonusförinige shape with a cylindrical Z vis client ows na nao-like projections the.: central bore. 2, spacer according to claim 2, characterized in that a slot is guided essentially in a radial plane with the outer edge and central bore. 5. A method for the automatic fastening of spacers according to claim 1 or 2 on reinforcement iron, characterized in that the spacer is brought with its main plane substantially perpendicular to the iibene aer longitudinal axis of the reinforcement iron at the point intended for fastening the spacer, that the spacer is attached This point is moved by bringing a cutting element into the path of the spacer in such a way that the spacer is essentially slit along a radial plane during its advancing movement, after which the cutting element and the spacer are removed against the rebar, while it is held in place, is printed in such a way that the spacer in the slot opens and the spacer 1 & its end position concentric 009852/0734 BADORTQfNAL is moved to the rebar while closing its slot due to the elasticity of the material. 4. Apparatus for performing des.Verfahren according to claim 3, characterized by a magazine for stacking spacers horizontally one above the other; an element for Separate the bottom spacer from the stack during each Operation; Means for rotating the spacer in a vertical position and for aligning it downwards against the open end of the device, this end being adapted to the position of the device and of the rebar relative to each other so that the The main plane of the spacer or its extension Longitudinal axis of the rebar is essentially right Intersects angle and that the diametrical plane through the spacer extends substantially through this axis; that means for gripping and holding the reinforcement at the lower end of the device and other means are provided for conveying the spacers down against the rebar; and by a cutting element (Knife), which is arranged in the elongated diametrical plane of the spacer, which is the longitudinal axis of the rebar wherein the cutting element after slitting the spacer on one side to the central bore is removable; and the means for separating, gripping and holding a spacer 8 from the stack 009852/0734 the reinforcement iron and to remove the cutting element arranged against peder action and to by. Mechanisms for which a common actuating means is intended to be operated. 5. Apparatus according to claim 4, characterized by a main part in the form of a magazine for the spacers above (2) forming the tube, the bottom a channel (6) for transporting and guiding the spacers down against a rebar (18) on which the spacers are to be attached, has; by one that promotes the spacers from the magazine, push them down against a knife (24) moving the slitting, removing the knife, holding the reinforcing iron and placing the spacers on the reinforcement self-pressing rod (ö), this rod being actuated in the longitudinal direction by a control lever (12) is displaceable by these functions taking over institutions. 6. Apparatus according to claim 5, characterized in that the rod (8) with a rack part (8a) »with the a gear (9) which is connected to the lever (12), combs, the lever and a fixed handle (13) being provided at the top of the device is. 009852/0734 7. Device according to. Claim 5 or 6, characterized in that that the rod (8) via link devices (14, 15) set up to actuate a delivery piston (16) is inclined into the. Tube (1) to separate the lowest spacer in the magazine against the action of a spring-loaded or even resilient retaining element (3) protrudes. 8. Device according to one of claims 5 to 7, characterized in that the rod (8) is articulated at the bottom with a liruckstück (20) which, when the rod moves downward, with a gripper (23) formed at the free end or fixed in the Channel (6) is introduced and presses the spacer against the knife (24), and that by the interaction of an inclined surface (20a) on the pressure piece with a corresponding inclined surface (27a) on the swivel arm (27), which is guided with a linear, the knife (24) carrying handle part is connected, the Hesser removed against the spring action. 9. Vorrichtimg according to one of claims 5 to 8, characterized in that the rod (8) cooperates through a protruding part (30) with an arm (31) on an angle lever mounted on the device and that the angle lever is pivoted during the downward movement and the lever with a second arm (32) and a link (33) actuates a second angle lever mounted on the device below, 009852 / Q734 -. 15 - that in the transverse direction of the pipe sliding clamping punches (36) are pressed to interact with a reinforcing iron (18) which is attached to the lower end of the pipe (T) in recesses in its edge, these pistons are beveled at each end and a wedge effect against exercise the rebar. 10.. Device according to claim 9 _f, characterized in that the third arm (38) mounted on the first angle lever is in such a way that, when the rod (8) is moved, during the return movement, by interacting with the projection (30), the removal of the clamping die (36) and the release of the locking engagement between the device and reinforcing iron (18) concerned. 009Ö52 / 0734 L e r s e i t e