DK144844B - EXHAUSTABLE WITH SIDE WALL BASED OR SHELF ELEMENTS - Google Patents

EXHAUSTABLE WITH SIDE WALL BASED OR SHELF ELEMENTS Download PDF

Info

Publication number
DK144844B
DK144844B DK630269AA DK630269A DK144844B DK 144844 B DK144844 B DK 144844B DK 630269A A DK630269A A DK 630269AA DK 630269 A DK630269 A DK 630269A DK 144844 B DK144844 B DK 144844B
Authority
DK
Denmark
Prior art keywords
shelf
shelf plate
bracket
rail
shelves
Prior art date
Application number
DK630269AA
Other languages
Danish (da)
Other versions
DK144844C (en
Inventor
C J Bjoerge
C G Alneng
Original Assignee
Bjoerge Carl Johan
Alneng Carl Goeran
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bjoerge Carl Johan, Alneng Carl Goeran filed Critical Bjoerge Carl Johan
Priority to DK349878A priority Critical patent/DK145111C/en
Publication of DK144844B publication Critical patent/DK144844B/en
Application granted granted Critical
Publication of DK144844C publication Critical patent/DK144844C/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47BTABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40Sliding drawers; Slides or guides therefor
    • A47B88/49Sliding drawers; Slides or guides therefor with double extensible guides or parts
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47BTABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • A47B96/02Shelves
    • A47B96/025Shelves with moving elements, e.g. movable extensions or link elements

Landscapes

  • Panels For Use In Building Construction (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
  • Drawers Of Furniture (AREA)
  • Warehouses Or Storage Devices (AREA)

Description

(19) DANMARK(19) DENMARK

W (12) FREMLÆGGELSESSKRIFT (11) 144844 BW (12) PUBLICATION WRITING (11) 144844 B

DIREKTORATET FOR PATENT- OG VAREMÆRKEVÆSENETDIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Ansøgning nr. 6302/69 (51) lnt.CI.3 A A 7 B 57/00 (22) Indleveringsdag 27· nov. 19¾ (24) Løbedag 27· nov. 1969 (41) Aim. tilgængelig 29· maj 1970 (44) Fremlagt 21. jun. 1982 (86) International ansøgning nr. “ (86) International indleveringsdag (85) Videreførelsesdag (62) Stamansøgning nr.(21) Application No. 6302/69 (51) lnt.CI.3 A A 7 B 57/00 (22) Filing date 27 · Nov. 19¾ (24) Race day 27 · Nov. 1969 (41) Aim. available May 29, 1970 (44) Presented Jun 21 1982 (86) International application no. ”(86) International filing day (85) Transfer day (62) Master application no.

(30) Prioritet 28. nov. 1968, 1 6278/68, SE(30) Priority 28 Nov. 1968, 1 6278/68, SE

(71) Ansøger CARL JOHAN BJOERGE, Land eryd, SE: CARL-GOERAN ALNENG, Taeby, SE.(71) Applicant CARL JOHAN BJOERGE, Land eryd, SE: CARL-GOERAN ALNENG, Taeby, SE.

(72) Opfinder Samme.(72) Inventor Same.

(74) Fuldmægtig Ingeniørfirmaet Budde, Schou & Co.(74) Associate Engineering Company Budde, Schou & Co.

(54) Udtrækkelige, med sidevægge forsynede bakke- eller hylde= elementer.(54) Retractable tray or shelf = elements.

Det har længe været kendt at anbringe bakke- eller hylde-elementer flyttelige, så at de kan placeres i forskellige højder efter behov i et stativ. Det er·endvidere kendt at lade hyldeelementerne være udtrækkelige fra en indre gemmestilling JQ til en ydre frilagt stilling. Et sådant meget udbredt hyldearran- 3" gement er beskrevet i svensk patentskrift nr. 175.912. Dette hylde- jø arrangement er i det væsentlige kendetegnet ved, at hylderne er ^ forskydeligt lejret i styreskinner, som er indstillelige i lodret ί < 2 umå retning og i et antal forskellige hældninger med det vandrette plan ved hjælp af parvis i styreskinnerne lejrede holdeorganer, som er udløseligt anbragt ved stativets sider, og at hylderne kan fastlåses i både en i stativet indskudt stilling og i mindst én, fra stativet delvis udtrukket stilling ved et samvirke mellem udløselige spærreorganer og stoporganer på henholdsvis hyldeelementet eller på en med stativet forbundet del.It has long been known to place tray or shelf elements movable so that they can be placed at different heights as needed in a rack. Furthermore, it is known to allow the shelf elements to be retractable from an inner storage position JQ to an outer exposed position. Such a widespread shelf arrangement is described in Swedish patent specification No. 175,912. This shelf arrangement is essentially characterized in that the shelves are in a number of different slopes with the horizontal plane, by means of pairs, retained in the guide rails, which are releasably arranged at the sides of the rack, and that the shelves can be locked in both a position inserted in the rack and in at least one position partially extended from the rack by a cooperating between releasable locking means and stop means on the shelf member or on a part connected to the stand, respectively.

I de senere år er der imidlertid sket én sådan udvikling af indretningsteknikken, og teknologien har nået et sådant stade, at helt andre faktorer, end de, der var aktuelle på den tid, hvor den i det nævnte svenske patentskrift nr. 175.912 beskrevne opfindelse fremkom, nu anses for væsentlige. Et af det kendte hyldearrangements hovedformål, nemlig at gøre hylderne skråt indstillelige, har i dag således kun ringe interesse, idet man nu foretrækker allerede fra begyndelsen at vælge en passende sk^åtstilling af hylderne, som der-r efter holdes uændret. Derimod er det i dag af vital interesse, at det tilgængelige rum er sikret som et effektivt opbevaringsrum i størst mulig udstrækning, så at det ikke er optaget af f.eks. mellemvægge og stativdele eller anvendes til anbringelse af f.eks. bre-» de styrespor. Af fremstillingstekniske årsager er det endvidere af stor betydning at sikre, at hyldernes styrespor kommer til at bestå af et så ringe antal dele som muligt og helst enkle, stansede dele, som kan samles på meget enkel måde.In recent years, however, one such development of the device technology has taken place and the technology has reached such a state that completely different factors than those at the time when the invention described in the Swedish patent specification No. 175,912 appeared , now considered essential. Thus, one of the main purposes of the known shelf arrangement, namely to make the shelves adjustable obliquely, has little interest today, since it is now preferable from the outset to choose an appropriate set of shelves, which is then kept unchanged. On the other hand, it is of vital interest today that the available space is secured as an effective storage space to the greatest extent possible, so that it is not occupied by, for example. partition walls and frame parts or used for placing e.g. wide steering tracks. Furthermore, for manufacturing reasons, it is of great importance to ensure that the guide grooves of the shelves will consist of as small a number of parts as possible and preferably simple, punched parts which can be assembled in a very simple way.

Det er desuden blevet meget væsentligt, at hylderne er indrettet på en sådan måde, at de i deres udtrukne stilling er frilagte i omtrent deres dybde, så at deres bageste område ikke overlappes af en overliggende hyldes forkant. Dette er navnlig væsentligt ved den art hældende hylder, som er almindeligt anvendt i f.eks. apoteker for opbevaring af krukker, flasker og andre emballage?:, som udtages i en bestemt orden og rækkefølge fra hyldernes forkanter, idet forrådet påfyldes ved hyldernes bagkanter, så at forrådet stadigt forynges. Hvis hyldernes bagkanter ved et sådant arrangement er vanskelig tilgængelige, et der fare for, at der ved påfyldning af nyt forråd for nemheds skyld sker en forskydning af tilbageblevne emballager bagud, så at forrådet påfyldes forfra i stedet for bagfra. Denne fare bør naturligvis fjernes.In addition, it has become very important that the shelves are arranged in such a way that they are exposed in their extended position at approximately their depth, so that their rear area is not overlapped by the leading edge of an overlying shelf. This is particularly important for the kind of inclined shelves commonly used in e.g. pharmacy for the storage of jars, bottles and other packaging?:, which are taken in a specific order and order from the front of the shelves, filling the storage at the rear of the shelves so that the store is constantly rejuvenated. If, at such an arrangement, the rear edges of the shelves are difficult to access, there is a danger that, for the sake of convenience, when filling new stock, there will be a shift of remaining packaging backwards, so that the stock is filled from the front rather than from the back. This danger should, of course, be removed.

33

U48UU48U

Opfindelsen har til formål at tilvejebringe udtrækkelige, med sidevægge forsynede bakke- eller hyldeelementer, som tilgodeser de nævnte behov. Dette formål opnås ifølge opfindelsen ved at udforme bakkerne eller hylderne som defineret i krav l's kendetegnende del.The invention has for its object to provide extendable, sidewall tray or shelf elements which meet the said needs. This object is achieved according to the invention by forming the trays or shelves as defined in the characterizing part of claim 1.

Opfindelsen skal i det følgende forklares nærmere under henvisning til tegningen, på hvilken fig. 1 viser set fra siden en del af et teleskopagtigt bæreorgan ifølge opfindelsen og i helt udtrukken stilling, fig. 2 samme, men i helt sammenskudt stilling, fig. 3 i skrå afbildning en hylde med bæreorganerne fastgjort i vægskinner og med hylden i udtrukken stilling, fig. 4 samme, men med hylden i indskudt stilling, fig. 5 i større målestok et tværsnit gennem bæreorganet efter linien V-V i fig. 4, fig. 6 i større målestok bæreorganets bageste ende, fig. 7 en i bæreorganet indgående konsol, set fra siden og efter linien X-X i fig. 5, fig. 8 samme, men set fra oven, fig. 9 set fra siden en i bæreorganet indgående, i tværsnit i hovedsagen Oformet skinne (også tværsnit efter linien A-A og B-B ses i denne figur), og fig. 10 set fra siden den ene af hyldepladens med bæreorganet samvirkende sidevægge.The invention will now be explained in more detail with reference to the drawing, in which: 1 is a side elevational view of a portion of a telescopic carrier according to the invention and in a fully extended position; FIG. 2 shows the same, but in fully extended position, FIG. Fig. 3 shows a shelf with a shelf with the supporting means fixed in wall rails and with the shelf in the extended position; 4, but with the shelf in the inserted position, fig. 5 shows, on a larger scale, a cross-section through the carrier along the line V-V in FIG. 4, FIG. 6 on a larger scale the rear end of the support means; FIG. 7 is a side view of the bracket included in the carrier, taken along line X-X in FIG. 5, FIG. 8, but seen from above, FIG. Fig. 9 is a side view of a transverse section, which is integral in the support member, generally shaped (also cross section along line A-A and B-B is seen in this figure); 10 is a side view of one of the shelf panels cooperating with the support member.

Som det fremgår af fig. 1 til 3 består bæreorganet til hver hylde af to konsoller 2,2a, som er udløseligt fastgjort i et vandret eller fortrinsvis en smule skråt fremad og nedadhældende plan ved lodrette skinner 3,3a. Disse kan være fastgjort til væggen eller på stolper, men kan tillige selv være udformede som stolper. For at muliggøre den udløselige fastgørelse på enkel måde er hver konsol 2,2a ved sin bageste del forsynet med to hager 2b (fig. 6), som kan indføres i slidser 3b i den respektive skinne 3,3a i den ønskede højde. På hver konsol 2,2a er der forskydeligt anbragt en i tværsnit C-formet skinne 6 henholdsvis 6a, hvorved bæreorganet kan forlænges fra den i fig. 2 viste stilling til den i fig. 1 og 3 viste stilling. Fig. 5 viser, hvorledes C-profilets flanger griber omkring konsollen 2, så at skinnen 6 styres på denne. For at lette skinnerne 6,6a's glidning på deres 4As shown in FIG. 1 to 3, the carrier for each shelf consists of two brackets 2,2a, which are releasably secured in a horizontal or preferably slightly inclined forward and downwardly inclined plane by vertical rails 3,3a. These may be fixed to the wall or to posts, but may also be designed as posts. To enable the releasable attachment in a simple manner, each bracket 2,2a at its rear is provided with two hooks 2b (Fig. 6) which can be inserted into slots 3b in the respective rail 3,3a at the desired height. On each bracket 2,2a, a cross-sectional C-shaped rail 6 and 6a are displaceably arranged, whereby the carrier can be extended from the one shown in FIG. 2 to the position shown in FIG. 1 and 3. FIG. 5 shows how the flanges of the C-profile engage around the bracket 2 so that the rail 6 is guided on it. To facilitate the rails 6.6a sliding on their 4

1448U1448U

konsoller 2,2a er disse i den viste udførelsesform på over- henholdsvis undersiden forsynet med glidestykker 10,10a,10b, 16 af plast, nylon eller teflon (fig. 1,2,3 og 5).brackets 2,2a, in the illustrated embodiment, are provided on slides 10, 10a, 10b, 16 of plastic, nylon or teflon, respectively (Figs. 1,2,3 and 5).

Hyldepladen l's sidevægge 5,5a er set i et lodret snit U-formet ombukkede (fig. 5) og indeslutter i de således dannede styrespor hver sit bæreorgan 2,6 henholdsvis 2a,6a. Hyldepladen 1 er forskydeligt på skinnerne 6,6a, der atter er teleskopagtigt forskydelige på konsollerne 2,2a. Forskydningen kan tilvejebringes fra en indskudt bageste stilling (fig. 4} til en vilkårlig ydre stilling (fig. 3). For at lette sidevæggen 5,5a's forskydning i forhold til skinnerne 6,6a er de sidstnævnte i den viste udførelsesform på overkanten forsynet med glidestykker 9,9a og 14 af plast, nylon eller teflon. Tilsvarende glidestykker 11 for side- rettet styring er i den viste udføreisesform anbragt på sidevæggene 5,5a's mod konsollerne 2,2a vendende sider.The side walls 5.5a of the shelf plate 1 are seen in a vertical section U-shaped fold (Fig. 5) and enclose in the guiding grooves thus formed, each supporting means 2.6 and 2a, 6a respectively. Shelf plate 1 is slidable on rails 6,6a, which are again telescopically slidable on brackets 2,2a. The displacement can be provided from an inserted rear position (Fig. 4} to any outer position (Fig. 3). In order to facilitate sidewall 5.5a displacement relative to the rails 6,6a, the latter in the illustrated embodiment is provided with the upper edge. slides 9,9a and 14 of plastic, nylon or teflon The corresponding slides 11 for lateral guidance are arranged in the illustrated embodiment on the sidewalls 5,5a facing the brackets 2,2a.

Ep spærreindretning til at holde hyldepladen 1 tilbage i den indskudte stilling (fig. 2 og 4) dannes af en mellem de U-formede sidevægge 5,5a's flanget nær hyldepladens forkant fastgjort stift 8, som i hyldepladen l's indskudte stilling forløber gennem en udsparing.17 (fig. 1 og 9) og rager ind i en midt for denne udsparing beliggende, kroglignende udsparing 21 (fig. 1 og 7) i konsollen 2. Hyldepladen 1 kan ikke trækkes ud, før dens forkant er løftet en smule, så at stiften 8 frigøres fra indgrebet med udsparingen 21.The ep locking device for holding the shelf plate 1 back in the inserted position (Figs. 2 and 4) is formed by a flange attached to the shelf plate 1 between the U-shaped side walls 5,5a flanged near the leading edge of the shelf plate, which extends through the recess in the shelf plate 1. 17 (Figs. 1 and 9) and protrudes into a hook-like recess 21 (Figs. 1 and 7) located in the center of this recess in the bracket 2. The shelf plate 1 cannot be pulled out until its leading edge is slightly raised, so that the pin 8 is released from the engagement with the recess 21.

Den U-formede sidevæg 5's indre flange har på sin mod konsollen 2 vendende side nær underkanten et spærrestykke 12 (fig.The inner flange of the U-shaped side wall 5 has on its side facing the bracket 2 near the lower edge a locking piece 12 (fig.

1,2 og 10), som i bæreorganets udtrukne stilling (fig. 1) samvirker med et stoporgan 15 ved skinnen 6's forreste ende. Samtidig spærres hver skinne 6,6a derved, at et stoporgan 13,13a ved dets bageste ende bringes i anlæg mod glidestykket 16 på konsollen 2 (fig. 1). Herved hindres en fortsat udtrækning af hyldepladen 1.1,2 and 10) which cooperate in the extended position of the carrier (Fig. 1) with a stop means 15 at the front end of the rail 6. At the same time, each rail 6,6a is blocked by bringing a stop means 13, 13a at its rear end against the slider 16 of the bracket 2 (Fig. 1). This prevents the continued extraction of the shelf plate 1.

I hyldepladen l's i fig. 2 og 4 viste indskudte stilling bærer konsollen 2 med sine glidestykker 10,10b den C-formede skinne 6, der atter bærer hyldepladen gennem glidestykkerne 9 og 14. Stiften 8 griber herved ind i udsparingen 21 og forhindrer, at hyldepladen 1 glider fremad. Hvis hyldepladen 1 skal udtrækkes, løftes indledningsvis dens forkant, så at stiften 8 frigøres fra udsparingen 21. Når hyldepladen 1 derpå føres fremad, støder spærrestykket 5 144844 12 mod den C-formede skinne 6's stoporgan 15, hvorved skinnen 6 medbringes, indtil stoporganet 13 på denne støder mod konsollen 2's nedre, som spærreorgan tjenende giidestykke 16. Hyldepladens tyngde optages i denne stilling i hovedsagen af skinnen 6's glide-stykke 14. Hvis hyldepladen er stærkt overbelastet ved sin forkant, hindres den i at svinge fremad og nedad som følge af, at dens gli-destykke 11 befinder sig under skinnen 6's øvre, nedtvungne kant, hvis bredde her forøges af glidestykket 9's nedre del (se også fig. 5). I denne udtrukne stilling kan hyldepladen frigøres fra de øvrige dele og helt fjernes ved at løfte forkanten så meget, at spærrestykket 12 frigøres fra stoporganet 15 (fig. 1). Skinnen 6 kan derefter tages bort ved at dens forreste ende føres opad, hvorved stoporganet 13 frigøres fra konsollen 2's nedre glide- og spærrestykke 16, hvilket muliggøres derved, at skinnen 6’s bageste ende da har passeret forbi konsollen 2's øvre giidestykke 10. Det indses således, at både hyldepladen 1 og skinnerne 6,6a ved et enkelt greb kan løsnes samtidigt og samlet fra konsollerne 2,2a. Alle delene 1,2,2a,6,6a kan løsnes samlet ved at hægte konsollerne 2,2a af deres skinner 3,3a.In the shelf plate 1 of FIG. 2 and 4, the bracket 2 with its slides 10, 10b carries the C-shaped rail 6, which again carries the shelf plate through the slides 9 and 14. The pin 8 thereby engages in the recess 21 and prevents the shelf plate 1 from sliding forward. If the shelf plate 1 is to be pulled out, its leading edge is initially lifted so that the pin 8 is released from the recess 21. When the shelf plate 1 is then pushed forward, the locking piece 5 bears against the stop member 15 of the C-shaped rail 6, thereby bringing the rail 6 until the stop means 13 on it abuts the lower bracket 2 of the bracket serving as a locking member 16. The weight of the shelf plate is taken up in this position mainly by the slide piece 14 of the rail 6. If the shelf plate is strongly overloaded at its leading edge, it is prevented from swinging forward and downward as a result of that its sliding piece 11 is below the upper, forced edge of the rail 6, the width of which is increased here by the lower part of the sliding piece 9 (see also Fig. 5). In this extended position, the shelf plate can be disengaged from the other parts and completely removed by lifting the leading edge so much that the latch 12 is released from the stop member 15 (Fig. 1). The rail 6 can then be removed by moving its front end upwardly, thereby releasing the stop member 13 from the lower slide and latch 16 of the bracket 2, thereby allowing the rear end of the rail 6 to then pass over the upper guide piece 10 of the bracket 2. , that both shelf plate 1 and rails 6,6a can be loosened simultaneously and assembled from brackets 2,2a at a single grip. All parts 1,2,2a, 6,6a can be loosened together by hooking the brackets 2,2a of their rails 3,3a.

DK630269A 1968-11-28 1969-11-27 EXTENSIVE, SIDEWALL BACKED OR SHELF ELEMENTS DK144844C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK349878A DK145111C (en) 1968-11-28 1978-08-08 DIVERSE FOR SHELVES IN SHELF SYSTEMS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1627868 1968-11-28
SE16278/68A SE360971B (en) 1968-11-28 1968-11-28

Publications (2)

Publication Number Publication Date
DK144844B true DK144844B (en) 1982-06-21
DK144844C DK144844C (en) 1982-11-29

Family

ID=20301980

Family Applications (1)

Application Number Title Priority Date Filing Date
DK630269A DK144844C (en) 1968-11-28 1969-11-27 EXTENSIVE, SIDEWALL BACKED OR SHELF ELEMENTS

Country Status (4)

Country Link
DK (1) DK144844C (en)
FI (1) FI51040C (en)
NO (2) NO130502C (en)
SE (1) SE360971B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469869B (en) * 1988-09-02 1993-10-04 Sintek Int Ab Locking device for moving slopes, shelves, drawers and the like
SE519117C2 (en) * 2001-10-26 2003-01-14 Elfa Sweden Ab System for releasable suspension of shelves, slopes or the like

Also Published As

Publication number Publication date
FI51040B (en) 1976-06-30
NO136951C (en) 1977-12-07
NO130502B (en) 1974-09-16
FI51040C (en) 1976-10-11
NO136951B (en) 1977-08-29
NO130502C (en) 1974-12-27
SE360971B (en) 1973-10-15
DK144844C (en) 1982-11-29

Similar Documents

Publication Publication Date Title
US3869052A (en) Truck for loading oven compartments
DK151683B (en) ELEVATOR BASKET WITH SCIENCE AND FOR MISCELLANEOUS APPLICATION IN A CABINET, STANDARD OR LIKE
US2739777A (en) Adjustable knockdown shelf assembly
US3874755A (en) Anti-tilt lock mechanism
ES501210A0 (en) IMPROVEMENTS IN DEVICES FOR THE STORAGE AND AUTOMATIC DISTRIBUTION OF OBJECTS, SUCH AS MEDICINE CASES.
US20070261199A1 (en) Linear Guide System for a Sliding Shelf
US1887102A (en) Filing cabinet
US3468591A (en) Trays or drawers and systems for stacking the same
US2890058A (en) Rack for grocery carts
US2322748A (en) Rack or supporting structure
DK144844B (en) EXHAUSTABLE WITH SIDE WALL BASED OR SHELF ELEMENTS
GB1202484A (en) Improvements in or relating to storage apparatus incorporating cupboards, drawers, shelves, filing cabinets and the like
US788856A (en) Clothing-table.
US2466033A (en) Sliding drawer
ES2202975T3 (en) SHELVING WITH INCLINED ANAQUEL FUNDS.
US2317232A (en) Sectional slidable shelf
US1608848A (en) Physician&#39;s examining table
US2848294A (en) Combination article-supporting and display rack and storage cabinet unit
NO325363B1 (en) Drawer shelf loading device
WO2007032686A1 (en) Marketing shelf
US1899687A (en) Desk and blackboard arrangement
NO119495B (en)
US4051978A (en) Merchandise compartmenting arrangement for an automatic vending machine
US1880461A (en) Receptacle with tray
CN219896254U (en) Oral care cabinet

Legal Events

Date Code Title Description
PBP Patent lapsed