Патент USA US2406487код для вставки
Aug. 27, 1946. ‘ c. BREWER ERASER ' Filed Aug. 16, 1945 I 2,406,487 2,406,487 Patented Aug. 27, 1946 .UNITED STATES; PATENT OFFICE ‘ 2,406,487 ' ERAsEa-Mj ’ Charles A. Brewer, Noroton Heights, Conn. Application August 16, 1943,‘Serial_No. 498,825 ‘ 81Claims. (c1. izoe-sc) I ‘ p . , 1 This invention relates to improvements in erasers as generally used for erasing writing, 2 ' I2 prevent escape of the erasures and dirt par- ~ ticles and'allow the air pressure to escape through hole 21, screen ‘I2 and vents I8 to the atmos drawing, typewriting‘and ‘similar uses. phere. 7 This invention has for its principal objectto , Receptacle I0 is made of transparent material take away the particles from the erased surface which serves to indicate when the receptacle re while it is being erased. ‘ ‘ Another object is to utilize the power or force quires emptying. Emptying is readily accom plished by pulling upward on cover I 3 While ' used in operating the eraser to also. act to re gripping receptacle It. This will separate these move the vparticles from the surface being erased. parts, allowing removal of baffle plate II and ' Another object is to prevent ‘undue injury to 10 screenIZ which may then be cleaned and the the. surface on which the erasures are being receptacle emptied and the parts I I and I2 placedv in position and the two parts Ill and I3 secured Another object is to dispose of the particles together by fasteners I4. An insert I9 of rubber or dirt caused by the erasing to a suitable re 15 or similar material is secured to the base at Ill. ceptacle.’ The circular eraser when worn out is readily Other objects will be understood from the fol ‘ removable for replacement by releasing the latch‘ lowing description. 25 which will allow pin 26 to be removed and the In the drawing: eraser housing 5 separated in halves and the Figure 1 is a partial longitudinal vertical sec made. I ' ‘ tion of the preferred form of the invention hav 20 eraser can be removed. , ' In the form shown in Figure l excessive erasure or damage to surface while being erased is pre moved. vented by the use of suction as the means for Figure 2 is a section taken on line A.—B. of Fig- ‘ revolving the eraser. Any excessive manual pres ure 1. sure on the eraser while erasing will automat Figure 3 shows a latch for securing assembly 25 ically slow down the speed at which the eraser of the eraser 3 as shown in Figure 2. will revolve. This is accomplished by propor Figure 4 is a longitudinal vertical section of a tioning the vanes 2| which will limit the power modi?ed form of my invention. delivered to the circular eraser 3; this’ provides In the embodiment of my invention, as illus a Slip drive between the motor 6 (or source of 30 trated in the accompanying drawing, 3 is a cir power) and the eraser 3. . ‘ cular shaped eraser, 4 a suction fan, 5 eraser hous While it is believed from the foregoing de ing, 6 an electric motor, ‘I an electric circuit con scription the nature and advantages of my'in trol switch for motor 6, 8 electric cord to a source vention will be readily understood, I do not limit ing one of the halves of the eraser housing re of electric current, 9 ?exible conduit, I0 trans ‘myself to what is herein shown and described parent receptacle for deposit of erasure particles, 35 and the right is herein reserved to make such II removable ba?le plate, I2 removable screen, I3 changes as properly ‘fall within the scope and is a cover for receptacle ID, at I4 is shown one spirit of my invention. , of the three fasteners for detachably securing I claim: . 1. An eraser comprising a housing and mount The operation of the eraser shown in Figure 1 40 ed therein a circular shaped revolvable eraser, is as follows: The lever of the electric switch conduit connection to said housing, one end of ‘I is moved to the position shown by dotted lines said conduit tangentially positioned to the perim in Figure 1. This closes the electric circuit and eter of said revolvable eraser, the other end of places the motor in operation, suction fan 4 being said conduit connected to the suction inlet of a secured to the motor shaft revolves thereby gen 45 motor driven suction fan, a discharge outlet from erating a suction in passage I6, ?exible tube 9 said suction fan having a passage ending in a and passage 20. This suction acts on circular dirt receptacle having a ba?le and a screen inter cover l3 to receptacle I0, Figure 1. eraser 3 and vanes ZI causing the circular eraser 3 to revolve in the direction indicated by the ar row in Figure 1. While the eraser is being ap posed between the receptacle chamber and out 50 lets to the atmosphere. plied to erase, particles are drawn in by suction into passage 20 through ?exible tube 9 and pas sage I6 through suction fan 4 and forced by air pressure from fan 4 through passage I‘I into re ceptacle chamber 23. A ba?le plate I I and screen 55 ‘ ,2. An eraser comprising a circular shaped eraser mounted in a housing and free to rotate, a passage leading from the interior of said hous ing, a conduit connected to said housing having its opening leading into said passage, a motor 3 2,406,487 driven suction fan having its suction passage ' joining the opening of the other end of said‘coné duit, a, discharge passage leading from said suc tion fan to the interior of a, receptacle, ba?ie plate and screen in said receptacle, air vents leading from inside of said receptacle above said baffle and screen to the atmosphere and a removable cover on said receptacle and providing a housing 4 5. An eraser provided with a rotary erasing member; a suction-operated turbine connected thereto to rotate the same; and means for ‘sup plying suction to said turbine, said suction also removing the erased particles resulting from an erasure by said rotary erasing member. 6. An eraser having a source of suction and a suction-operated movable means, and an erasing member: connected to said movable means to be for operating saidi suction fan. , 10 moved thereby’ to produce an. erasure,‘ the suction 3. An eraser comprising a housing; a circular also acting to remove the erased particles result revolvable abrasive member mounted therein; ing from the erasure by said movable erasing suction-operated means connected to said abra a member. sive member to rotate the same; a motor-driven 7. An eraser having a movable abrasive mem suction fan; a conduit connected'to said'hous 155. ber; a power source; and means including a ?uid ing, ,one end of said conduit being tangentially driving medium, for connecting the eraser to said positioned to the perimeter of the revolvable ab power source to be driven thereby, said drive rasive member and also positioned to connect the yielding: when, the abrasive member is overloaded suction-operated means: to said motor-driven to prevent damage to the material being erased. suction fan; and a. dirt receptacle connected to 20 8. An abradingt device including a. housing hav the discharge outlet, of said suction fan. ing, mounted therein a movable abrasive, member; , 4. An eraser comprising. a} housing having suction-operated driving means for said mem mounted therein a movable abrasive member; ber to. move the. same to cause. an abrasion; and suctioneoperated means connectedlto said mem-‘ a conduit connected to a source of suction and ber to move the same to cause an erasure ;_. and. 25 arranged to cause said suction-operated driving a conduit connected to a sourcerof suction and means, to be operated and drive said abrasive so positioned as to cause said suction-operated member, and to provide a suction means, adja-. means to be operated. and drive said‘ abrasive. cent said abrasive member for picking, up. parti member, said conduit. also opening adjacent said, cles resulting from the operation. of said abra for said suction fan, its passages, and; the motor“ abrasive member and removing particlesv result. 30 ing from the operation, of said abrasive member.v sive member. . s CHARLES A. BREWER.v .