DE202006014329U1 - Book-end for supporting a book has a tubular prop, an anchoring part with a spine brace with a clearance from and parallel to a plug-in brace to be placed between the sides of a book - Google Patents

Abstract

A plug-in brace (12) rotates on its longitudinal axis. An anchoring part (A) with a detachable link to a tubular prop (B), especially via a plug-in connection, can partly plug into the the top part (21) of the prop, when not in use. It also has a prism-shaped, conical peg at a base end. A spine brace (11) links to the peg via a stay (13) running radially from the peg. Independent claims are also included for the following: (1) A telescopic mechanism; (2) A device with a telescopic mechanism.

Description

From the DE 103 30 549 A1 is a bookend with a stand and an anchor to be fixed in a book part known about which when reading while lying down the weight of a book can be supported.

Of Furthermore, various telescopic mechanisms are known in which two or more nested pipes in a desired axial position can be fixed. The associated fixation mechanisms, for example, by Konen apart driven clamping baskets are doing relatively expensive and susceptible to interference.

In front In this context, it was an object of the present invention to provide a improved bookend and to provide a simplified telescoping mechanism.

According to her In the first aspect, the invention relates to a bookend with a tubular stand and a associated Anchor part, wherein the anchor part is a back strut and one to the back strut spaced and - in Reference to the respective longitudinal extent - parallel arranged and storable between the pages of a book strut having. The stand Both a round tube and a triangular, square, or Be polygonal tube. Optionally, it can consist of a solid material.

Preferably are the back brace and especially the strut essentially flat and (in her Cross section) T-shaped arranged to each other. The (flat) strut can then between The sides of a book are laid while the back strut is outside of the book or book back extends and the book thus firmly between back strut and strut can be held.

According to one Further development of the invention is the strut about its longitudinal axis - at least in a limited angular range - rotatable. This has the Advantage that they have different angular positions to the backrest and adapt to the curvature of the pages of a book.

According to one preferred embodiment of the bookend I detachable the anchor part the stand connected, wherein the connection is made in particular via a plug connection can. The stand can then be solved by the anchor part be when the bookend not in use.

at a development of the above embodiment, the anchor part in the unused state at least partially in the (corresponding with cavities provided) stand be plugged. For example, it may be possible that the complete back strut and / or the entire strut can be plugged into the tubular stand. By the Zusammensteckbarkeit of anchor part and stand can the bookend be compactly compact, in addition to the Anchor part is protected.

at a special embodiment a collapsible bookend has the anchor part at the foot end (the by definition in use the stand facing) a prismatic or conical pin, which in the upper end of the tubular stand can be plugged to connect the anchor part hereby.

According to one Further development of the above embodiment, the backrest about a radially projecting from the pin web to be connected to the pin. Furthermore, the stand can one in this regard Have recess in which the web engages when the anchor part with the stand is plugged together. By the positive engagement of the web in a recess of the stand a stabilization and rotation of the connection is achieved.

According to one another development of the bookend is the anchor part in the stand insertable and fixable there in an adjustable depth. In other words can it for pulled a use out of the stand and in a desired Position be fixed to the bookend the prevailing requirements (Book size etc.) optimally adapt.

In another embodiment of the bookend a train connection between the backrest strut and the strut is present, which pulls the strut in the direction of the back strut when pointing in the direction of the stator force. The said force load is usually generated automatically during use of the bookend by an inserted book, so that the book itself clamped or fixed between the back strut and the strut.

According to one another development of the invention, the stand at least two telescopically connected pipes on, so its Length the respective requirements or wishes of the User can be customized. The pipes can do this in particular realize a telescopic mechanism, as below generally closer explained becomes.

One Telescope mechanism according to the second Aspect of the invention contains on the one hand an outer tube, in cross section at least in an axial section a non-circular Inner contour has, as well as an inner tube in the cross section at least has a non-circular outer contour in an axial section. As the names indicate, should the proportions be such that the inner tube can be inserted into the outer tube. Farther the non-round contours are designed so that the inner tube and the outer tube in the assembled state depending on the relative angular position φ to each other (i.e., depending on the rotation of the outer tube relative to the Inner tube) either against each other axially freely displaceable or jam against each other.

by virtue of the cooperating non-round contours of inner tube or outer tube is thus achieved that the two tubes optionally free axial displaceable or in a desired axial position are locked against each other, wherein the locking or Dearretierung a simple twisting of the tubes against each other enough. Further aids are not required.

• 1. f(φ) = f(φ + 2π), so dass die Funktion nach einer vollen Umdrehung (2π) des Winkels φ in sich selbst übergeht; es können optional auch kleinere Periodizitäten verwirklicht sein, z. B. von π (vgl. 7).
• 2. f(φ) ∈ [0, Δ] für eine vorgegebenes Maß Δ > 0; die Größe r₀ stellt also den minimalen und die Größe r₀ + Δ den maximalen Radius dar.

The non-circular outer contour of the inner tube and / or the non-circular inner contour of the outer tube can in particular by a measured from the center of the tube from radius and angle φ the Art r (φ) = r 0 + f (φ) where the (continuous or discontinuous) function f should periodically be positive with (at least) the period 2π and everywhere. In other words, for f and all angles φ:

• 1. f (φ) = f (φ + 2π), so that the function goes into itself after a full revolution (2π) of the angle φ; Optionally, smaller periodicities may be realized, e.g. B. of π (see. 7 ).
• 2. f (φ) ∈ [0, Δ] for a given measure Δ>0; The size r ₀ thus represents the minimum and the size r ₀ + Δ represents the maximum radius.

The Function f may have exactly one maximum, in particular in the interval [0, 2π], where in this case, it necessarily also has a minimum. D. h., That, for example, the radius of the inner tube along its outer contour when crossed over a full angle of 2π exactly once between a minimum and a maximum commutes.

Alternatively, the function f in the interval [0, 2π] can also have several successive minima with increasing altitude. Between the minima mentioned must necessarily be maxima, wherein the height preferably also increases according to their angular position. Such a wavy structure of the contour can produce an advantageous latching effect (cf. 6 ).

Furthermore, the said function f in the interval [0, 2π] can optionally also be asymmetrical (with respect to each selected intermediate point of the interval, see outer contours of the inner tubes in FIGS 5 and 6 ) be. This means that in a clockwise direction, a different course of the resistance force against the rotation occurs than with an opposite rotation.

The cooperating contours of inner tube and outer tube can be configured in particular so be that the resistance to a relative twisting of the Inner tube opposite the outer tube in a predetermined direction of rotation increases up to a maximum. The Increase may be monotone or non-monotonic (i.e. their height oscillating). The strenght The deadlock between the two tubes can then be determined by freely set wide turning between zero and the maximum.

According to one another embodiment The telescopic mechanism can reduce the relative rotatability of the outer tube and inner tube at a stop angle, so that a rotation only up to the stop angle, but not beyond (non-destructive) possible is.

Preferably, said outer contour and / or said inner contour over the entire axial extent of the inner tube or the outer tube constant. Then the pipes can be produced particularly favorable as extrusion profiles. Optionally, however, the contours may vary along the axial extent, so that at different relative axial positions of inner tube and outer tube results in a different rotational behavior. Further, optionally, a non-circular contour in one of the tubes may be confined to a smaller axial section (ie, the remainder of the tube has a circular contour) while the co-operating out-of-round contour of the other tube extends over its entire axial length.

• – einen Stock, vorzugsweise Wanderstock, Skistock, Zielstock, Zeigestock oder dergleichen;
• – ein Stativ, z. B. für Fotoapparate oder Laborgeräte;
• – einen Stiel von Geräten (z. B. Apfelpflückern) oder (Sonnen- bzw. Regen-)Schirmen;
• – ein Stützstrebe für Bauarbeiten, z. B. eine Zargenklemme;
• – einen Lampenträger;
• – eine Antenne;
• – ein Staubsaugerrohr;
• – eine Rollo-, Markisen- oder Gardinenstange;
• – eine Vorhangsschiene, z. B. für Duschvorhänge.

The described telescopic mechanism can in principle be used anywhere where telescopically interconnected pipes should be selectively fixed in certain axial positions against each other. The invention therefore also relates to an (arbitrary) device which contains such a telescopic mechanism. This may in particular be one of the following devices:

• A stick, preferably walking stick, ski pole, target pole, pointing stick or the like;
• - a tripod, z. For cameras or laboratory equipment;
• - a stalk of appliances (eg apple pickers) or (sun and rain) umbrellas;
• - A support strut for construction work, z. B. a frame clamp;
• - a bulb holder;
• An antenna;
• - a vacuum cleaner pipe;
• - a roller blind, awning or curtain rod;
• - a curtain rail, z. B. for shower curtains.

in the The invention will be exemplified with the aid of the figures explained. It shows:

1 in perspective, a bookend according to the invention;

2 in perspective, the foot end of a special embodiment of a plug-in anchor part;

3 in perspective to the anchor part of 2 belonging head of a stand pipe;

4 in perspective, an alternative plug-in mechanism for anchor part and stand;

5 a cross-section through a first embodiment of a telescopic mechanism according to the invention in dissolved (left) and locked (right) position;

6 a modification of the telescopic mechanism of 5 with wavy contour of the inner tube;

7 a cross section through a second embodiment of a telescopic mechanism according to the invention with elliptical pipe contours in dissolved (left) and locked (right) position.

In 1 is schematically illustrated a bookend according to the invention in a perspective. Basic explanations to a bookend can be found in the DE 103 30 549 A1 , which is fully incorporated by reference into the present application. The bookend consists of an anchor part A, to which a book can be fixed, and a stand B located outside the book.

The stand B consists in the example shown of two telescopically interconnected hollow round tubes 21 . 22 , These can be extended by the user to a desired axial length and then fixed against each other with a later to be explained telescopic mechanism.

The anchor part A consists of a substantially flat back strut 11 and a spaced apart and in the longitudinal direction parallel thereto arranged flat strut 12 , Seen in the plan or in cross section are the back strut 11 and the strut 12 T-shaped arranged to each other. Optionally, the strut could be rotatable about its longitudinal axis to accept other than right angles to the back strut can.

Furthermore, in 1 an optional clamping mechanism indicated. This includes a train connection in the form of a band 13 , which with both ends near the stand on the back strut 11 is fixed and the strut 12 wraps. Will the band 13 loaded from above through a book and thereby pressed in the direction of the stand B, so it simultaneously pulls the strut 12 on the back strut 11 to. When the strut 12 in its lower foot rotatable with the stand (pipe 21 ), she can give in to the train, keeping the book tight between the back brace 11 and strut 12 pinch.

The anchor part A can in principle be fixedly connected to the stand B, for example by welding. Preferably, however, anchor part A and stand B are detachably connected to each other, so that the anchor part can be removed from the stand when not in use the bookend. The anchor part A may in particular be connected to the stand B via a plug-in mechanism. In the in the 2 and 3 specifically shown plug-in mechanism is in this respect at the foot of the anchor part A, a conical or prismatic pin 14 arranged with circular cross-sectional area (in other words, a truncated cone-shaped or cylindrical pin), from which on the one hand in the axial direction of the strut 12 springs and on which on the other hand via a radially projecting web 13 the back brace 11 is fixed at a distance. The diameter of the pin otherwise corresponds to the inner diameter of the stator tube 21 At its upper end, so that the pin (with little play) can be inserted into the pipe. In 3 is in this regard the upper end of the stator tube 21 shown enlarged, wherein a slot extending in the axial direction 23 is recognizable. When putting the bookend together, the bridge engages 13 of the anchor part A in this slot 23 a, whereby the anchor part A is fixed against rotation.

An alternative plug-in mechanism is in 4 shown. The back brace 11 and the strut 12 are here (without a pin) connected to each other at the foot of the anchor part directly in a T-shaped structure. Furthermore, the upper end of the stator tube 21 now three slots 23 into which the three arms of the mentioned T-structure can be inserted.

In addition to the described possibilities of a connection between Anchor Part A and Stand B, there are a variety of other possibilities. It can, for example, the stator tube 21 be so large that the entire anchor part with back strut and strut can be sunk therein. In this case, by a suitable mechanism, for example a clamping cone similar to a bottle cap, for a fixation of the anchor part in (any) axial height relative to the stator tube 21 to care.

As already mentioned, the stand can in particular consist of two or more telescopic parts 21 . 22 exist that can be pushed together when not in use bookend and pulled apart in use and locked in a desired axial position against each other. 5 shows in this regard a preferred telescopic mechanism, which allows easy locking in any axial position. The telescopic mechanism comprises an inner tube 101 and a surrounding outer tube 102 (which the pipes 21 respectively. 22 from 1 correspond). It is important that the inner contour of the outer tube 102 and the hereby cooperating outer contour of the inner tube 101 are each formed out of round. Thus, in the example shown, the inner contour of the outer tube 102 a radially inwardly directed nose-shaped projection 104 while the outer contour of the inner tube 101 a radially inwardly directed, ramp-shaped recess 103 has (Note: The representation in the 5 - 7 is not to scale, but especially in the radial dimensions excessive). The exact contours can be mathematically determined by a 2π-periodic radius r (φ) dependent on the angle φ or φ 'for the outer contour of the inner tube 101 or R (φ ') for the inner contour of the outer tube 102 describe. In the 1 Shown forms can be described for example by the following radii (for r ₀ , R ₀ , Δ, δ, φ ₀ , φ ₁ > 0):

The constants of the radii functions are chosen so that at an unrotated position of the tubes to each other (ie at the rotation angle α = 0, see. 1 left), the tubes in the axial direction freely with a minimum clearance ε ≥ 0 can be shifted from each other (in particular, R ₀ - δ ≥ r ₀ + ε, R ₀ ≥ r ₀ + Δ + ε, and R ₀ - δ <r ₀ + Δ). If the tubes are twisted against each other (α ≠ 0, cf. 1 right) so occurs an increasingly strong jamming of the tubes against each other, so that they are fixed non-positively in their respective axial position.

The radius r of the outer contour of the inner tube 101 from 1 has at φ = 0 (at least approx wise) a substantially discontinuous jump. As a result, a stop is formed, beyond which no further rotation of the tubes against each other is possible. The stop can, as shown, in particular be formed immediately adjacent to the freely displaceable axial position, so that a loosening of jammed pipes automatically ends at the stop in the freely displaceable position. A difficult search of the axially freely displaceable position can be avoided thereby.

Preferably, the described inner tubes or outer tubes of the telescopic mechanism are uniform over the entire axial extension, so that they can be produced in a simple manner as extruded parts. However, it is also possible to provide (at least or exactly) one of the tubes only in a limited axial region with a non-circular (inner or outer) contour. For example, could a clamping screw from the outside through the jacket of the outer tube 101 be turned so that they inside a "punctual", re-adjustable projection 104 or said mantle could be dented inwardly in a punctiform manner.

6 shows a modified telescopic mechanism 100 ' , wherein the same reference numerals as in 5 stand for unchanged components. In contrast to 5 is the recess 103 ' on the outer contour of the inner tube 101 ' now not monotonously rising, but wavy with a series of minima and maxima of increasing height. The lead 104 of the outer tube 102 Therefore, it can almost snap into place at different angular positions, which not only makes the locking force-locked, but also positively locking.

In 7 is another variant of a telescopic mechanism 200 represented, in which the inner tube 201 and the outer tube 202 have ellipsoid cross sections. For example, such shapes can be created simply by compressing an initially circular tube so that after deformation it has a maximum diameter D and a minimum diameter d <D. At a relative rotation by the angle α thus creates a deadlock between the two tubes. Optionally can on the outer tube 202 an inward projection (not shown) may be formed (eg, a punctiform dent) which is overcome upon rotation and which then stabilizes the inner tube in an arresting angular position.

Claims (21)

Bookend, characterized by - a tubular stand (B, 21 . 22 ), - An anchor part (A) with a back strut ( 11 ) and a spaced and parallel thereto, storable between the pages of a book strut ( 12 ). Bookend according to claim 1, characterized in that the back strut ( 11 ) and the strut ( 12 ) are substantially flat and that they are seen in cross-section substantially T-shaped to each other. Bookend according to claim 1 or 2, characterized in that the strut ( 12 ) is rotatable about its longitudinal axis. Bookend according to one of claims 1 to 3, characterized in that the anchor part (A) releasably connected to the stand (B, 21 . 22 ), in particular via a plug connection. bookend according to claim 4, characterized in that the anchor part (A) in the unused state at least partially in the stand (B, 21) can be plugged. Bookend according to one of claims 1 to 5, characterized in that the anchor part (A) at the foot of a prismatic or conical pin ( 14 ) having. Bookend according to claim 6, characterized in that the backrest ( 11 ) via a radially from the pin ( 14 ) outgoing bridge ( 13 ) with the pin ( 14 ) connected is. Bookend according to claim 7, characterized in that the web ( 13 ) in a recess ( 23 ) of the stand ( 21 ) intervenes. Bookend according to at least one of claims 1 to 8, characterized in that the anchor part (A) at an adjustable depth in the stand (B, 21 . 22 ) can be fixed. Bookend according to at least one of claims 1 to 9, characterized by a train connection ( 13 ) between the back brace ( 11 ) and strut ( 12 ), which, when directed on the stand (B) load the strut ( 12 ) in the direction of the back brace ( 11 ) pulls. Bookend according to one of claims 1 to 10, characterized in that the stand (B) at least two telescopically interconnected tubes ( 21 . 22 ) contains. Bookend according to claim 11, characterized in that the tubes ( 21 . 22 ) form a telescopic mechanism according to at least one of claims 13 to 20. Telescope mechanism ( 100 . 100 ' . 200 ), containing - an outer tube ( 102 . 202 ), which has a non-circular inner contour in cross section at least in an axial section; - an inner tube ( 101 . 101 ' . 201 ), which has a non-circular outer contour in cross-section, at least in an axial section, inner tube ( 101 . 101 ' . 201 ) and outer tube ( 102 . 202 ) Depending on the relative angular position α to each other axially freely against each other are displaced or jammed against each other. Telescope mechanism according to claim 13, characterized in that said outer contour and / or said inner contour is described by a function r (φ) = r ₀ + f (φ), wherein for the function f and all angles φ: - f (f) φ) = f (φ + 2π) and - f (φ) ∈ [0, Δ] for a given measure Δ> 0. Telescope mechanism according to claim 14, characterized in that that the function f in the interval [0, 2π] exactly one maximum and / or Minimum has. Telescope mechanism according to claim 14, characterized in that that the function f in the interval [0, 2π] several consecutive Minima and / or minima with increasing altitude. Telescope mechanism according to at least one of claims 13 to 16, characterized in that the function f in the interval [0, 2π] asymmetric is. Telescopic mechanism according to at least one of claims 13 to 17, characterized in that the resistance to relative rotation of inner tube ( 101 . 201 ) and outer tube ( 102 . 202 ) increases in one direction of rotation up to a maximum. Telescopic mechanism according to at least one of claims 13 to 18, characterized in that the relative rotatability of outer tube ( 102 ) and inner tube ( 101 ) ends at a stop angle. Telescopic mechanism according to at least one of claims 13 to 19, characterized in that said outer contour and / or said inner contour over the entire axial extent of the inner tube ( 101 . 201 ) or the outer tube ( 102 . 202 ) is constant. Device with a telescopic mechanism after at least one of the claims 13 to 20, in particular: floor, preferably walking stick, ski pole, Target stick, or pointing stick; Tripod; Stem of devices or Shield; support strut for construction work; Bulb holder; Antenna; Vacuum cleaner tube; Roller blind, awning or curtain rod; Curtain rail.