DK163715B

DK163715B - SHIPPING AT A COST

Info

Publication number: DK163715B
Application number: DK112182A
Authority: DK
Inventors: Helmut Schlueter
Original assignee: Freudenberg Carl Fa
Priority date: 1981-10-30
Filing date: 1982-03-12
Publication date: 1992-03-30
Also published as: DK163715C; EP0078358A3; FI76481C; EP0078358B1; DE3143080A1; ES268280U; DK112182A; FI76481B; NO820596L; ATE16467T1; PT74433B; PT74433A; FI820655L; DE3143080C2; ES268280Y; NO151491C; EP0078358A2; NO151491B

Abstract

1. A handle attachment for a broom, comprising a broom body (2) having a hollow (4) which extends parallel to the handle (3) and into which can be inserted an adapted pin (6) which is connected with the handle, said pin (6) having a recess (5), a stop (7) and a protrusion (8) which can spring into the recess by manual operation, a retaining edge (9) of the broom body (2) being allocated to the protrusion (8), characterised in that the pin (6) is made of a strip having a U section which has an essentially uniform wall thickness, that the individual legs of the U section merge into one another in a dished manner and are each arched inwards, and that the wall thickness is dimensioned and the U section is adapted to the section of the hollow (4) in such a way that the two lateral legs (10, 11), along their upper ends, and the centre leg (12), in the area of the symmetrical axis, sit in a spring-like manner against the inner wall of the hollow (4), which inner wall otherwise has a space.

Description

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iin

Opfindelsen angår en skaftbefæstigelse til en kost, der består af et kostlegeme med en udsparing, hvis længdeakse strækker sig parallelt med skaftets længderetning, og som har en på tværs af skaftet forlobende holdekant, i hvilken udsparing en hertil tilpasset og med 5 skaftet forbundet tap af termoplastisk plastmateriale er indstikkelig, hvilken tap har en udsparing, et anslag samt et fremspring, der kan fjedre ind i udsparingen i tappen og som spærreklinke ligge an mod holdekanten.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a shank attachment to a broom which consists of a broom body with a recess whose longitudinal axis extends parallel to the longitudinal direction of the shaft and which has a transverse shaft retaining edge in which a recess is adapted to a shaft associated therewith. thermoplastic plastic material is pluggable, which has a recess, a stop and a protrusion which can spring into the recess in the pin and as a locking link abut the holding edge.

En skaftbefæstigelse af denne type kendes fra tysk fremlæggelses-10 skrift nr. 29 06 154. Tappen har en polygonalformet profil og er i den fremspringende del spidset til kegleform for at sikre forankring af kosten. Kostlegemet er ligesom tappen af et termoplastisk plastmateriale, og tappen er fremstillet ved sprøjtestøbning. Herved opstår der imidlertid vanskeligheder med at realisere en vakkelfri forbindelse 15 mellem de to dele som følge af en forskellig krympning afhængig af tappens og udsparingens forskellige tværsnit i de forskellige områder.A shaft fastening of this type is known from German Proposition No. 29 06 154. The pin has a polygonal shaped profile and is in the projecting part pointed to cone shape to ensure anchoring of the diet. The dietary body is like the spigot of a thermoplastic plastic material, and the spigot is made by injection molding. However, this results in difficulties in realizing an unsteady connection 15 between the two parts due to a different shrinkage depending on the different cross-sections of the pin and the recess in the different areas.

Der skal desuden tages hensyn til, at de fleste termoplastisk forarbejdelige plastmaterialer har tilbøjelighed til afhængigt af omgivelsesbetingelserne at optage eller afgive fugt, hvorved målfastheden kan 20 påvirkes uheldigt. Af denne grund er det allerede blevet foreslået at belægge anslagsfladen med et lag af et blødt elastisk materiale. Den grundlæggende problematik berøres imidlertid ikke herved. Sådanne bløde elastiske materialer har desuden en tilbøjelighed til at blive belagt med smuds, hvilket gør en sådan udførelsesform problematisk 25 såvel i hygiejnisk som i æstetisk henseende.In addition, it should be taken into account that most thermoplastic processable plastics tend to absorb or release moisture, depending on the ambient conditions, whereby the target strength can be adversely affected. For this reason, it has already been proposed to coat the abutment surface with a layer of a soft elastic material. However, the basic problem is not affected. Furthermore, such soft elastic materials have a tendency to be coated with dirt, making such an embodiment problematic in both hygienic and aesthetic terms.

Opfindelsen har til formål at tilvejebringe en skaftbefæstigelse af den indledningsvis nævnte art, hvilken skaftbefæstigelse er uproblematisk i hygiejnisk henseende og selv ved målmæssige afvigelser mellem de enkelte dele i forhold til idealmålene samt ved senere, af forskellige 30 grunde betingede målændringer er vakkelfri og funktionssikker.The invention aims to provide a shaft fastening of the type mentioned initially, which shaft fastening is problematic in hygienic terms and even in case of possible deviations between the individual parts in relation to the ideal targets and later, for a variety of 30 reasons, target changes are shakeless and functional.

Dette formål opnås i overensstemmelse med opfindelsen ved, at tappen har U-profil med en i alt væsentligt konstant vægtykkelse, at de enkelte ben og det midterste ben i U-profilen går afrundet over i hinanden og hvælver indefter, og at tappens U-profil er tilpasset til 2This object is achieved in accordance with the invention in that the pin has a U-profile with a substantially constant wall thickness, that the individual legs and the middle leg of the U-profile are rounded into each other and curved inwards, and that the pin's U-profile is is adapted to 2

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kostlegemets udsparing pi en sådan måde, at de to sideben ved deres frie ender og det midterste ben i området ved symmetriaksen under forspænding ligger fjedrende an mod indervæggen af kostlegemets udsparing, og at der mellem de øvrige områder af sidebenene og det 5 midterste ben er afstand til indervæggen af kostlegemets udsparing.the recess of the diaphragm in such a way that the two lateral bones at their free ends and the middle leg in the region of the axis of symmetry under bias spring resiliently against the inner wall of the diagonal recess, and that there is a distance between the other regions of the lateral legs and the middle leg to the inner wall of the recess of the diet body.

Skaftbefæstigelsen kan fremstilles af alle forekommende, benyttede termoplastiske plastmaterialer, idet det imidlertid er nødvendigt at tage hensyn til de mekaniske, de termiske og de kemiske egenskaber ved dimensioneringen og den tilsigtede anvendelse. Som følge af den 10 ringe vandoptagelsesevne har anvendelsen af polyolefinplast vist sig specielt hensigtsmæssig til husholdningsområdet. Til industrielle anvendelser, hvor en kraftigere påvirkning med organiske opløsningsmidler kan forventes, har anvendelsen af POM, PETP og PA vist sig mere gunstig.The shaft fastening can be made from all existing thermoplastic plastics materials used, however, it is necessary to take into account the mechanical, thermal and chemical properties of the design and the intended use. Due to the poor water absorption capacity, the use of polyolefin plastic has proved particularly suitable for the household area. For industrial applications where a stronger impact with organic solvents can be expected, the use of POM, PETP and PA has proved more favorable.

15 Ved den foreslåede skaftbefæstigelse overføres kræfterne til skaftet via den U-formet profilerede taps sideben og midterstykke, der ligger an mod udsparingens indervæg. Sidebenene og midterstykket muliggør herved en udligning af afvigelserne fra idealmålet, og problemer ved beherskelse af dimensionsforandringer som følge af skrumpning eller 20 udvidelse er følgelig uden betydning.15 At the proposed shaft fastening, the forces are transferred to the shaft via the U-shaped profiled taper side leg and center piece which abuts against the inner wall of the recess. The lateral legs and the center piece thereby allow for an offset of the deviations from the ideal target, and problems in controlling dimensional changes due to shrinkage or enlargement are therefore of no significance.

Forudsætningen for denne elastiske tilpasning er den berøring, der svarende til et tværsnit er begrænset til et enkelt punkt mellem hvert enkelt sideben og udsparingens tilhørende indervæg og mellem midterstykket og udsparingens tilhørende indervæg. Benene formår for så 25 vidt at udligne uregelmæssigheder i mellemzonerne, hvorved der som følge af de ensartede hvælvinger, som går over i hinanden, samtidigt opnås en udlignet specifik tværsnitsbelastning i de enkelte områder.The prerequisite for this resilient fit is the contact corresponding to a cross-section limited to a single point between each individual leg and the corresponding inner wall of the recess and between the center piece and the corresponding inner wall of the recess. The legs are able to compensate for irregularities in the intermediate zones to a large extent, whereby, due to the uniform vaults that intersect, a specific cross-sectional load is achieved simultaneously in the individual areas.

Af denne grund skal man ikke frygte spændingsrevner i området ved overgangszonerne mellem de enkelte ben. 1For this reason, no stress cracks should be feared in the area at the transition zones between the individual legs. 1

Afstandene mellem de tre berørings- eller belastningsangrebspunkter, der således er indeholdt i et tværsnit, kan ved retningsneutral kraftpåvirkning være identiske. I forbindelse med en konventionel husholdningskost, der har en større udstrækning i tværretningen end i længderetningen, har det derimod vist sig mere fordelagtigt, når deThe distances between the three touch or load attack points thus contained in a cross-section may be identical for directional neutral force. In contrast, with a conventional household food having a greater extent in the transverse direction than in the longitudinal direction, it has proved more advantageous when the

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3 to sidebens belastningsangrebspunkters indbyrdes afstand er storre end disse belastningsangrebspunkters afstand til det midterste bens belastningsangrebspunkt. Forholdet mellem de to afstande skal ved en husholdningskost udgøre fra 1,1 til 2,5, fortrinsvis 1,4.3 the spacing of two side leg load attack points is greater than the distance of these load leg points to the center leg load point of attack. At a household cost, the ratio of the two distances should be from 1.1 to 2.5, preferably 1.4.

5 For at lette fremstillingen og simplificere samlingen har det vist sig fordelagtigt, når tappen under tilsvarende indpasning af udsparingen i den fremspringende del er tilspidset kegleformet. Graden af kegleformens tilspidsning behøver kun at være ubetydelig og kan fx udgøre 1 til 4°. En tilsvarende variation har ingen principiel indflydelse 10 på det tilsvarende funktionsprincip.5 In order to facilitate the manufacture and simplify the assembly, it has proved advantageous when the pin, while correspondingly fitting the recess in the protruding part, is tapered cone-shaped. The degree of taper of the cone shape need only be negligible and may, for example, be 1 to 4 °. A corresponding variation has no principle influence 10 on the corresponding principle of function.

Forholdet mellem den største bredde og den største højde i den U-formede profilerede tap skal udgøre 1,1 til 2,1, fortrinsvis 1,6. Inden for det tilsvarende område opnås der med mininale dimensioner, dvs. optimalt materialeforbrug, en optimal stabilitet i henseende til foran-15 kringen af en kost, der har en større tvær- og længdeudstrækning.The ratio of the greatest width to the highest height of the U-shaped profiled pin should be 1.1 to 2.1, preferably 1.6. Within the corresponding range, minimal dimensions are obtained, viz. optimum material consumption, optimum stability in respect of the provision of a diet which has a greater transverse and longitudinal extent.

Forholdet mellem bredden A og dybden B i sidebenenes indhvælvinger skal udgøre 4,5 til 7, fortrinsvis 5,5. Inden for dette angivne område optræder der udlignede spændinger i forbindelse med det samlede tværsnit af den U-formet profilerede tap, dvs. en specielt stor sik-20 kerhed mod forekomsten af spændingsrevner ved indføring i udsparingen i kostlegemet. Målet B er defineret som det absolutte mål af indhvælvingen, hvorimod målet A er defineret som den indbyrdes afstand mellem de på det bredeste sted udefter udragende steder af hvert enkelt ben.The ratio of the width A to the depth B in the lateral bones should be 4.5 to 7, preferably 5.5. Within this specified range, equalized stresses occur in connection with the total cross-section of the U-shaped profiled tab, ie. a particularly high security against the occurrence of stress cracks upon introduction into the recess in the dietary body. The target B is defined as the absolute target of the arch, whereas the target A is defined as the distance between the projections at the widest point outwardly of each leg.

25 Forholdet mellem føringstappens største længde og største bredde kan udgøre 1,5 til 3, fortrinsvis 2,0. Det har betydning for sikringen af en specielt vakkelfri forbindelse mellem skaftet og selve kostlegemet ved let håndtering. Begge forhold påvirker hinanden uheldigt, hvilket gør det foreslåede område til et specielt gunstigt kompromis. 1The ratio between the largest length of the guide pin and the greatest width can be 1.5 to 3, preferably 2.0. This is important for securing a particularly unobtrusive connection between the shaft and the dietary body by easy handling. Both conditions adversely affect each other, making the proposed area a particularly favorable compromise. 1

De fordele, der skal fremhæves, ved den foreslåede skaftbefæstigelse består foruden en let håndterbarhed i en speciel god funktionssikkerhed, dvs. først og fremmest i sikringen mod slidforekomster, udvi- delse, krympninger og unøjagtigheder i enkeltdelene, en i vid ud strækning uafhængig, vakkelfri forbindelse mellem skaftet og kost- legemet.The advantages to be emphasized in the proposed shaft attachment, in addition to being easy to handle, consist in a particularly good functional safety, ie. first and foremost in the protection against abrasions, enlargement, shrinkage and inaccuracies in the individual parts, a largely independent, unsteady connection between the shaft and the body.

44

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Kostbefæstigelsen kan fremstilles med ringe omkostninger, og den 5 udmærker sig ved en specielt ringe vægt med stor holdbarhed. Den er af denne grund ikke kun egnet til koste, men også til forbindelse mellem andre arbejdsredskaber og et skaft.The bracket can be manufactured at low cost, and it is distinguished by a particularly low weight with high durability. For this reason it is not only suitable for cost, but also for connection between other work tools and a shaft.

Opfindelsen vil i det følgende blive nærmere forklaret under henvisning til tegningen, på hvilken 10 fig. 1 viser et længdesnit gennem en skaftbefæstigelse efter indføringen i et kostlegemes udsparing og fig. 2 et tværsnit gennem den i fig. 1 viste skaftbefæstigelse efter linjen A-A.The invention will be explained in more detail below with reference to the drawing, in which: FIG. 1 shows a longitudinal section through a shaft fastening after insertion into the recess of a dietary body; and FIG. 2 is a cross-section through the embodiment of FIG. 1 along the line A-A.

En i fig. 1 vist skaftbefæstigelse 1 består af et termoplastisk plast-15 materiale, fx POM, PRTP eller PA. Den kan fremstilles ved en sprøjtestøbnings proces.One in FIG. 1 shaft fastening 1 consists of a thermoplastic plastic material, eg POM, PRTP or PA. It can be made by an injection molding process.

I den øverste del har skaftbefæstigelsen et cylindrisk fremspring 14, på hvilket et skaft 3, der består af et tyndvægget aluminiumsør eller jernrør, anbringes. Skaftets forreste kant dækkes af et rundtgående 20 fremspring 13 på skaftbefæstigelsen.In the upper part, the shaft mounting has a cylindrical projection 14, on which a shaft 3 consisting of a thin-walled aluminum pipe or iron pipe is placed. The front edge of the shaft is covered by a circumferential projection 13 on the shaft mounting.

I den nederste del strækker der sig en tap 6 i alt væsentligt parallelt med skaftet. Denne tap er såvel under et som i henseende til sin vægtykkelse tilspidset jævnt kegleformet i den udragende del og kan på denne måde fremstilles specielt simpelt og indstikkes i en udspa-25 ring 4 i et kostlegeme 2.In the lower part, a pin 6 extends substantially parallel to the shaft. This pin is uniformly tapered cone-shaped in the protruding portion both in terms of its wall thickness and in this way can be made particularly simple and inserted into a recess 4 in a dietary body 2.

Tappen har en U-formet mod højre åben udsparing 5, ind i hvilken der fra et anslag 7 rager en fjedertunge 15 med et på denne anbragt fremspring 8. Fjedertungen er ved sin forreste kant skåret skråt af og viger på denne måde ind i udsparingen 5, når tappen 6 stikkes 30 ind i udsparingen 4. Til senere frigørelse af skaftbefæstigelsen er det kun nødvendigt at trykke fremspringet 8 ind i udsparingen 5 vedThe pin has a U-shaped to the right open recess 5, into which from a stop 7 protrudes a spring tongue 15 with a projection 8 placed on it. The spring tongue is cut off at its front edge and in this way extends into the recess 5 when the pin 6 is inserted 30 into the recess 4. For later release of the shaft fastening, it is only necessary to push the projection 8 into the recess 5 by

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5 hjælp af tommelfingeren og trække de to dele fra hinanden i retningen mod kosteskaftet. På denne måde frigøres en holdekant 9.5 Using your thumb, pull the two parts apart in the direction of the brush shaft. In this way, a holding edge 9 is released.

Udsparingen 4 er i mundingsområdet udvidet til et frirum 16, der omgiver tappen, og i hvilket de to dele ikke har nogen indbyrdes kon-5 takt. Frirummet 16 tjener til sikring af en tilstrækkelig bevægelighed af tappen 6’s enkelte ben i tværretningen.The recess 4 in the mouth area is extended to a clearance 16 surrounding the pin and in which the two parts have no contact with each other. The clearance space 16 serves to ensure adequate movement of the single leg of the pin 6 in the transverse direction.

Fig. 2 tjener til tydeliggørelse af den geometriske udformning i et plan efter snitlinjen A-A gennem de i fig. 1 viste sammenføjede dele.FIG. 2 serves to clarify the geometric design in a plane along section line A-A through the lines shown in FIG. 1 are joined together.

Tappen 6 har en U-formet profil, hvis tre ben er hvælvet indefter og 10 med ensartet vægtykkelse går afrundet over i hinanden.The pin 6 has a U-shaped profile, the three legs of which are curved inwards and 10 of uniform wall thickness rounded into each other.

Tværsnittet af kostlegemet 2’s udsparing 4 er tilsvarende tilnærmelsesvis tilpasset tappens tværsnit, men omslutter denne med afstand med undtagelse af belastningsangrebspunkter C. Tappens enkelte ben 10, 11 og 12 er således i stand til at bevæge sig frit i mellemrummene 15 mellem belastningsangrebspunkterne C og vil på denne måde udligne målmæssige afvigelser. Belastningsangrebspunkterne tydeliggør placeringen af berøringslinjerne, der strækker sig parallelt med skaftet og dermed vinkelret på tegningsplanet, mellem tappen og kostlegemets udsparing.The cross-section of the recess 4 of the diaphragm 2 is similarly approximately adapted to the cross-section of the pin, but encloses it at a distance with the exception of load attack points C. Thus, the individual legs 10, 11 and 12 are able to move freely in the spaces 15 between the load attack points C and will this way offsets target deviations. The load attack points clarify the location of the contact lines extending parallel to the shaft and thus perpendicular to the drawing plane, between the pin and the recess of the body.

20 Kraftoverføringen i berøringslinjerne sker afhængigt af den faktiske belastning, men i statisk ligevægt tilnærmelsesvis svarende til de i fig. 2 viste vektorer D svarende til betingelserne i en statisk stabil krafttrekant. Belastninger, som man kunne frygte ville medføre en vakling, på kostlegemet kan således ikke optræde. 1 2 3 4 520 The transmission of force in the contact lines is dependent on the actual load, but in static equilibrium approximately similar to that of FIG. 2, corresponding to the conditions of a statically stable force triangle. Loads that one might fear would cause a wobble, thus, on the dietary body cannot occur. 1 2 3 4 5

Størrelsen af indhvælvingen af benene 10, 11 og 12 i tappen 6's profil 2 er defineret ved målene A og B. Målet A kendetegner afstanden 3 mellem de på de bredeste steder udefter udragende punkter, og målet 4 B den vinkelrette målte afstand fra et punkt i det samme plan til det 5 bagest beliggende punkt, begge målt i aflastet tilstand.The size of the arch of the legs 10, 11 and 12 in the profile 2 of the pin 6 is defined by the measurements A and B. The target A is the distance 3 between the points projecting at the widest points outward and the target 4 B the perpendicular measured distance from a point i. the same plane to the 5 rearmost point, both measured in the unloaded state.

Claims

A shank fastening (1) for a broom consisting of a broom body (2) having a recess (4) whose longitudinal axis extends parallel to the longitudinal direction of the shaft and having a transverse shank 5 extending edge (9), which recess (4) is a plug (6) of thermoplastic plastic material which is adapted to the shaft (6) and which has a recess (5), a recess (5), a stop (7) and a projection (8) which can springs into the recess (5) of the pin (6) and, as a blocking latch, abut the retaining edge (9), characterized in that the pin (6) has a U-profile with a substantially constant wall thickness, that the individual legs (10) , 11) and the middle leg (12) of the U-profile are rounded over one another and curved inwards, and that the U-profile of the pin (6) is adapted to the recess (4) of the body (2) in such a way that they two lateral legs (10, 11) 15 at their free ends and the middle leg (12) in the region of the axis of symmetry under bias spring resiliently against the inner wall of the diaphragm (2) recess (4) and that between the other regions of the lateral legs (10, 11) and the middle leg (12) there is a distance from the inner wall of the diaphragm (2) recess.

Shaft fastening (1) according to claim 1, characterized in that the ratio of the greatest width to the highest height in the U-profile of the pin (6) is from 1.1 to 2.1.

Shaft fastening (1) according to claim 1 or 2, characterized in that the ratio of the greatest width 25 to the highest height in the U-profile of the pin (6) is 1.6.

Shaft fastening (1) according to claim 1, characterized in that the ratio of the width (A) to the depth (B) of the vaults in the lateral legs (10, 11) is from 4.5 to 7, measured in the non-prestressed state. 1

Shaft fastening (1) according to claims 1-4, characterized in that the ratio of the width (A) to the depth (B) of the arches in the lateral legs (10, 11) is 5.5, measured in the non-prestressed state. DK 163715 B

Shaft fastening (1) according to claims 1-2, characterized in that the profile of the pin (6) in the projecting part is uniformly tapered.

Shaft fastening (1) according to claims 1-6, 5, characterized in that the ratio of the largest length to the largest width of the pin (6) is from 1.5 to 3.0.

Shaft fastening (1) according to claims 1-7, characterized in that the ratio of the largest length to the largest width of the pin (6) is 2.0.