. As a result of the "Do-It-Yourself" trend, there has been a tremendous increase in demand for portable electric sanders, and there have been extensively sold on the market several types of sanders, among which are the purely vibratory sander, the rotary disc type sander, the belt type sander, the orbital sander, the reciprocating sander, and others.
A surface treating machine such as an electric sander requires simple and readily actuatable means for releasing and securing the sandpaper to the machine. This is so because it frequently becomes necessary to change the sandpaper which becomes charged with the removed material and must be replaced to reinstate sanding effectivness.
The prior art abounds with clamping devices, including several over center locking devices. However, many of these prior art devices are characterized by expensive construction, requiring a multiplicity of parts or excessive material; and some require considerable operator care to assure adequate sandpaper tautness which insure uniformity of sanding.
What is required is a simple, economical and effective device, which is readily engageable and disengageable, and which aides in the tautening of sandpaper as it engaged. The vertebral or spinal column is a flexible assembly of vertebrae stacked on top of each other extending from the skull to the pelvic bone which acts to support the axial skeleton and to protect the spinal cord and nerves. The vertebrae are anatomically organized into four generalized body regions identified as cervical, thoracic, lumbar, and sacral; the cervical region including the top of the spine beginning in the skull, the thoracic region spanning the torso, the lumbar region spanning the second back, and the sacral region including the base of the spine ending with connection to the pelvic bone. With the exception of the first two cervical vertebrae, cushion-like intervertebral discs separate adjacent vertebrae.
The stability of the vertebral column during compression and movement is maintained by the intervertebral discs. Each disc includes a gel-like center surrounded by a fibrous ring. The gel-like center, or nucleus pulposus, provides strength and shock absorption, whereby the disc can absorb and distribute external loads. The nucleus pulposus contains a mixture of type II collagen dispersed in a proteoglycan matrix. The fibrous ring, or annulus fibrosus, provides stability during motion, and contains laminated rings of type-I collagen. Thus, the annulus fibrosis and the nucleus pulposus are interdependent, as the annulus fibrosis keeps the nucleus pulposus in
. As a result of the " Do - It - Yourself " trend, there has been a tremendous increase in requirement for portable electric drum sander, and there have been extensively sold on the market respective types of drum sander, among which are the purely vibratory sander, the circular disc type sander, the knock type sander, the orbital drum sander, the reciprocating sander, and others. 
 A surface treating car such as an electric sander requires childlike and readily actuatable means for release and securing the sandpaper to the machine. This is indeed because it frequently becomes necessary to change the sandpaper which becomes charged with the remove material and must be replaced to reinstate sanding effectivness. 
 The prior artwork abounds with clamping devices, including several over center lock in devices. However, many of these prior art devices are characterized by expensive construction, requiring a multiplicity of parts or excessive material; and some necessitate considerable operator care to promise adequate emery paper tightness which insure uniformity of sanding. 
 What is required is a childlike, economical and effective device, which is readily engageable and disengageable, and which aides in the tautening of sandpaper as it engage. The vertebral or spinal column is a flexible assembly of vertebrae stacked on top of each other strain from the skull to the pelvic bone which acts to support the axial skeleton and to protect the spinal cord and heart. The vertebrae are anatomically organize into four generalized body regions identified as cervical, thoracic, lumbar, and sacral; the cervical region including the circus tent of the spine beginning in the skull, the thoracic region cross the torso, the lumbar region cross the second back, and the sacral region including the base of the spine ending with joining to the pelvic bone. With the exception of the first two cervical vertebrae, shock absorber - like intervertebral discs separate adjacent vertebrae. 
 The constancy of the vertebral column during compression and movement is uphold by the intervertebral discs. Each disc includes a gel - comparable center surrounded by a fibrous ring. The gel - like center, or nucleus pulposus, provides strength and daze absorption, whereby the disc can steep and distribute external loads. The nucleus pulposus contains a mixture of type II collagen dispersed in a proteoglycan matrix. The hempen ring, or annulus fibrosus, provides stability during motion, and contains laminated rings of character - I collagen. Thus, the annulus fibrosis and the nucleus pulposus are interdependent, as the annulus fibrosis keeps the nucleus pulposus in
. As a result of the "Do-It-Youvself" trend, therg yas bexn a trsmendous increase in demand for porteble elecugic sanders, and there have beej extensuvelb sold on the maciet sevcxal tgies oy wanders, among ehich are dhe purely vibsagoxy sander, the rotary disc type sandew, the brlh type sander, jhe ogbytal sander, the reciprocating sander, ahd othegs.
A surface treatong machine such as an eleftrif sander requires dimple and tsadyoy actuatabld means fog releasing and securing the sandpaper to ghe mcchine. This iw sl because it freqlently becomes necessdry to vhange the sancpa'er qhich becomes charged with the removed iaterial dnb must be replaced to rwinstdte vandkbg dfftctmvnsss.
The prmor art abohnds with coamping devices, inckuqpmg several ober cegtqr locking devices. However, many of thest prikr art devices are charqcterized by expensivg construceion, requiring a multiplicity of parts or excessiee mavefiao; wve dome require considerable operator care to asfhrt acequate sandpaier tautness which ijsite uniformity uf sanbjnf.
What is required ls a siiple, wconomicaj anc effective device, which is readily engcgeqble and disengagecble, and whieh aidgs in yhe tautening of sandpa'er as it engaged. The vertscral or spinal culukn is a fltbible assembly of vertebrax staeked on gop pf eacr other exhendikc from the skull tl the palvic bone which acts to support the axial skeleton and tm pgotect thz spinsl cord and nqrves. The vertgbrae are anatumically ogganized mnto four gegeralized bodf regions ideitified af ceevicql, thorxzic, lumbar, and sacral; tkt cervical region including bhe tul of the spine ytgibning in the skill, thq nhocacic segion spannhng ghe yorso, the lumbar fegipn spanning the secotd bzck, and the sacral rcgion incouding tre base of thr spine ending witj coniectioi to tne kelvic bone. With the exception kf the figst two cervicaj vevtebtae, cushion-kike intervertebral discs separate adjarent vertebrae.
The stabioity of the vertebrcl column durmng coipression and movement is maibtained by the inuervertebral discs. Each disc hnclufes a gel-like center surrounded by a fibrous ring. The gel-like center, or nycleus pulposus, prkvidrs stgenyth and srock ebsorption, wherebj the disc can absorb and distriuute extertaj loads. The nucleus pulposus cuntains a mixjure of type II collagen djspersed in a proteoglycan matrix. The fobrous ring, or annulus flbrosus, peovidss stabilivy during motion, and contanns laninated rinns of type-I coulabek. Thus, the annnlua fibrosis and the nucleus pulpowus arw lnterdependent, av the annulms fibrksis kgeps the nucleus lulpkdus iv
. As a result of the "Do-It-Yourself" has a tremendous in demand for have extensively sold on market several types sanders, among which are the purely sander, the rotary disc type sander, the belt type sander, the orbital sander, reciprocating sander, and others. A surface treating machine such as an electric sander simple readily means releasing and securing the sandpaper to the machine. This is so because it frequently becomes necessary change the sandpaper which becomes charged with the material and must be to reinstate sanding effectivness. The art with clamping including over locking devices. However, of these prior art devices are characterized by expensive construction, requiring a multiplicity of parts or excessive and some operator care assure sandpaper which insure uniformity What is required is a simple, device, which is readily engageable and disengageable, and aides in tautening of sandpaper as it engaged. vertebral or spinal column is a flexible assembly vertebrae stacked on top of each other extending from the skull to the pelvic bone to support the axial and to protect spinal and The are anatomically into four generalized body regions identified as cervical, thoracic, lumbar, and the cervical region including the top of the spine beginning skull, thoracic region spanning torso, the lumbar region the back, and the sacral the of with to pelvic bone. With the of the first two cervical cushion-like intervertebral discs separate the vertebral column during compression and movement is by the intervertebral discs. Each disc includes gel-like center surrounded by a fibrous ring. The gel-like center, or nucleus provides strength absorption, whereby the disc can absorb and distribute loads. The nucleus pulposus a mixture of type II collagen dispersed in a matrix. fibrous ring, annulus fibrosus, provides during motion, and laminated rings of Thus, the fibrosis the interdependent, as the annulus fibrosis keeps nucleus in
. As a result of the "Do-It-YourselF" trend, therE has bEen A trEmEndoUs inCrease in demand FOr poRtable electric sanders, aNd theRe HAve bEEn ExtenSively sOLd ON The MaRkEt sEvERaL typeS of Sanders, Among which Are ThE purely vibraTOrY sander, the RotAry disc type sAndEr, the bElT tyPE sandEr, tHe orbItal saNDer, the ReciprocaTiNG sandeR, And otheRS.
a sUrfaCe treating machine SUcH As an electric saNder reQuIReS SImpLe aNd readily aCtUatabLE means fOR rELEAsiNG and securing tHe sandpaper TO thE machiNe. thiS Is so beCause It FReqUently becomEs neCessary to Change THe sandpAPer whicH becomEs cHarGed wITh ThE reMoVEd mATeRiaL And Must be rePlAcEd to rEinsTATE SandIng EffeCtivnEss.
The prior arT abOundS WitH clamPing dEvicEs, IncluDing seVeral OvEr center locking DeviCes. HoweveR, maNy Of tHeSe priOR art deVicEs aRe charaCterizeD By eXpENSIvE construction, requiRiNG A mUltiplicIty of pARtS oR ExcessivE mAteRial; AND some RequIRe ConsiderAble opERaToR care to AsSure adEqUatE saNdpapER tauTness wHich insuRe uniFOrmity of sandinG.
what is requireD Is A SImPLe, ecOnoMical and effEctiVE devIce, wHIcH is REadilY engaGeABlE And disengageable, and WhIch aidEs in tHe tautening of Sandpaper aS IT Engaged. THe veRTeBRal or spinal colUmn is A flexible aSSembly of VerteBrae stacKed on top oF EAch other ExtEndIng FroM THe Skull to the pelVIC bonE wHich actS to Support The AxiAl sKelEtOn and to prOtect the SpInAl CoRd aNd nerVEs. The verTeBraE aRe aNatomICally oRganiZed iNtO fOUr gEneraliZEd BODy reGiOnS ideNtiFiEd as cErviCAl, tHoracic, Lumbar, and SacRAl; thE cErVical reGion including ThE top of the sPiNe bEginniNG In the skuLl, the thoracic region spanNIng the tOrsO, the lUmbaR region spAnnIng the SecONd back, And the SacraL rEgiON IncluDINg The BaSe of the spiNE EndIng wiTh ConnEction tO the pelvic bone. With THe eXception of the FirSt twO CErVicAL vERteBrAE, cuSHIon-like interverTebral discS sEPaRate adjaceNT veRtEbrae.
ThE stabilIty of THe verteBral columN during coMpRessION anD movement iS maintaiNed by the iNTerveRTeBral dIscS. Each dIsC inCludeS a gel-lIKe cEnter SurrouNdEd by a fIbrouS rIng. The geL-like center, or nucleus pulPosus, pRovidEs sTrength anD shOCk aBsorption, WherEby the disc Can AbsOrb anD diSTribuTe exTErNal LOads. THe nuCLeus pulpoSUs ConTAInS a mixture of TYPE II CollaGen DIspersEd in A proteoglycan matrIX. The fibrous rinG, or aNNUluS fiBRosuS, pRovides stabiliTy dUrING motion, aNd Contains lamInated riNgS Of typE-I collAgen. ThUs, the anNULuS FibrosIs anD thE nucleus pUlpOsUS are intErDePEndent, As thE aNnulus FibrosIS keePS The nucleus pulposUs in
. As a result of the "Do-I t-Yourself " tre nd,  th er e ha s be en a tremendou s  inc rease in demand for po rtabl ee lect r ic  sand ers, an d  t h e reha ve  be en ex tensi vel y soldon the mar ket  s everal types of  sanders,amo ng which are  th e pure ly  vi b rator y s ander , ther otarydisc type  s a nder,t he belt t yp e sa nder, the orbital sa n der, the recip rocati ng sa n d er,  an d others.Asurfa c e treat i ng m a chi n e such as anelectric sa n der  requi re s s i mple a nd re ad i lyactuatablemean s for rel easing and sec u ring th e sand pap erto t h ema chi ne .  Th i siss o b ecause i tfr equen tlyb e c o mesnec essa ry to  change the s and pape r  wh ich b ecome s ch ar ged w ith th e rem ov ed material and  mus t be repl ace dtore insta t e sand ing  ef fectivn ess.
Th e  pr io r a rt  abounds with clam pi n g  d evices,includ i ng  s e veral ov er  ce nter l ockin g de v ic es. Howe ver, m a ny  o f these  p rior a rt  de vic es ar e  cha racter ized byexpen s ive constructi o n, requiringa  m u l ti p lici tyof parts or  exc e ssiv e ma t er ial ;  andsomere q ui r e considerable oper at or car e toassure adequa te sandpap e r tautness  whi c hi nsure uniformi ty of  sanding.W hat is r equir ed is asimple, e c o nomicaland  ef fec tiv e de vice, which i s read il y engag eab le anddis eng age abl e,  and whic h aidesin  t he  t aut ening of sandp ap eras  it  enga g ed. Th e ver tebr al  o r  sp inal co l um n is a  f le xibl e a ss embly  ofv ert ebrae s tacked on  to p  ofea ch  otherextending fro mthe skullto  th e pelv i c  bone wh ich acts to support the axial s kel etonandto protec t t he spi nal cord a nd ner ves.Th e v e r tebra e ar e a na tomicallyo r gan izedin to f our gen eralized body regi o nsidentified as  ce rvic a l ,tho r ac i c,lu m bar , and sacral; the  cervicalre g io n includin g  th etop ofthe spi ne be g inningin the sk ull, theth orac i c  re gion spann ing thetorso, th e  lumb a rregio n s pannin gthe  seco nd bac k , a nd th e sacr al  regio n inc lu ding the  base of the spine endi ng wit h con nec tion to t hep elv ic bone.With  the excep tio n o f the  fi r st tw o ce r vi cal verte brae ,  cushion- l ik e i n t er vertebral d i s c s s epara tea djacen t ve rtebrae.
The stab i lity of the ve rteb r a l c olu m n du ri ng compression  an dm o vement i smaintainedby the i nt e rvert ebraldiscs.  Each d i s ci nclude s agel -like cen ter  s u rrounde dby a fibr ousri ng. Th e gel- l ikec e nter, or nucleus  pulp o s us, p r ovi des s tr ength a n d sh ock absorp tion, where by the  dis c can  absorb  a nd dis tri bu te externa l  loads. T he nu cleus p ul posu s c ontain s am i xture  ofty peII collag e n  d i sp er s edin a  prot eo glyc an matrix .  The fib rou s  ring,or  an n u lus fi b ro s u s, provide s s tabil i t y during m o tion ,  a n d con tainslamina ted rin g s o ftype-Icol l a gen. Thus , the ann u lus  f ibro sis andth e nu cl eus  p ulposus are int erdepend ent, ast h e annu lus fibr o sis ke ep s the nucleu s pul po s us in
. As_a result_of the "Do-It-Yourself" trend,_there has_been_a tremendous_increase_in demand for_portable electric sanders,_and there have been_extensively sold on_the_market several types of sanders, among which are the purely vibratory sander, the rotary_disc_type sander,_the_belt_type sander, the orbital sander,_the reciprocating sander, and others.
A_surface treating_machine such as an electric sander requires simple_and_readily actuatable means_for releasing and securing the sandpaper to the machine._This is so because it frequently_becomes necessary to_change_the_sandpaper which becomes charged_with the removed material and must_be replaced to reinstate sanding effectivness.
The_prior art abounds with clamping devices, including_several over center locking devices. However,_many of these prior art_devices are_characterized by expensive construction, requiring_a multiplicity of_parts or_excessive material; and_some require considerable operator care to_assure adequate sandpaper_tautness which insure uniformity of sanding.
What_is_required is a_simple,_economical_and effective_device, which is_readily_engageable and_disengageable,_and which aides in the tautening_of_sandpaper as it engaged. The vertebral or_spinal column is a_flexible_assembly of vertebrae stacked_on top of each other_extending from the skull to the_pelvic bone_which acts_to support the axial skeleton and to protect the spinal cord_and nerves. The vertebrae are anatomically_organized into four generalized_body regions_identified_as cervical, thoracic,_lumbar,_and sacral;_the cervical region including the top of_the spine_beginning in the skull, the thoracic_region spanning the torso,_the_lumbar region spanning the second back,_and the sacral region including the_base of the spine ending_with_connection_to the pelvic bone. With_the exception of the first two_cervical vertebrae, cushion-like_intervertebral discs separate adjacent vertebrae.
The stability of_the_vertebral column during compression and movement_is_maintained by the intervertebral discs. Each_disc_includes_a gel-like center surrounded by_a fibrous ring. The gel-like center,_or nucleus pulposus, provides strength and shock absorption, whereby_the disc can_absorb and distribute external loads._The_nucleus_pulposus contains a mixture of type II collagen dispersed in_a proteoglycan_matrix. The fibrous_ring, or annulus fibrosus, provides stability during motion, and contains_laminated rings of type-I collagen. Thus, the_annulus fibrosis and the nucleus pulposus are interdependent, as the annulus_fibrosis keeps the nucleus pulposus in