US2375604A - Grinding machine - Google Patents

Description

y 1945- v c. R. WILLIAMS 2,375,504

GRINDING MACHINE Filed Jah. 2, 1942 2 Sheets-Shet 1 Patented May 8, 1 945 1 UNITED PATENT OFFICE a a fyzsiasoe p v a GRINDING MACHINE. Clarence .R. Williams Brooklyn; NJ Y., assignor t 'toAtlanticServiceCompainy, Inc., Brooklyn, N. Y.,ta. corporation of New York ApplicationJanuary 2, 1942; Serial No. 425,428 ,ll C laimsl ('01. 51-135) This invention relates to grinding machines of" th'eabrasive belt type for sharpening knives and similar articles and is an improvement upon the grinding machine shown in U. 3. Patent 2,222,966

issued in my; name on November 26; 1940. J

An object r the present invention isto provide an improved tool holding mechanism for this type of niachinewhich is" readily adapted to a variety of tools. Other objects of the invention will be apparent from the following specification and the accompanying drawings, in which:

Fig. 1 isa side elevation of the housing of the grinding mechanism with the cover removed; Fig. 2 is aside elevation of the mechanism taken on'theoppositeside from Fig. 1;

Fig. 3" isja top planviewof the mechanism;

Fig. 4 is a sideelevation ofthe tool holding mechanism by itself, without the housing:

aligned spring tables I! and l8which aresecured to, the inner 'frame l9, that in turn is fixed to Fig. 5isa side elevation of the .tool" holding mechanism on the opposite side from, Fig. 4,

except adjusted for a heavier tool and f Fig. 6 isan end view from the left of Fig. 5. i This machine comprises a housing enclosing a pairiofb'elt wheels upon which an'abrasive belt a'motor exteriorof the housing, (not shown in is mounted and one of these wheels is driven by' thiscase) to move the belt underthe tool that is" being sharpened. A portion of the top .of the housing isremovable to expose a portionof the belt, butis lockedin its operating position, and an adjustable tool holder'ispivotally mounted on andguideplate 53, the free edge of which terminates in the turned up flange 54.

the housingto hold the tool ina predetermined position relative to" the belt while ground or sharpened.

, The toolholding mechahismcomprises apair of plates, theupper edgesiof which are adjustit is being able relative to the plane of the belt'toj determine the-angularposition of the tool relativeto the belt andals'o to a pivoted guard and guide memberi'which partially covers the belt and which is latched in its operative j position. A; bail is pivotally secured to the guide member withi'ts free endsupported' by 'said tool holding plates and is arranged to provide a single pointof sup port'forthe' side of the tool, thesharpen'ed edge of; which is supported on sai'djbelt. Theguard member" and the bail may be turned back clear of the abrasive beltwhen the whole surface of thebelt is tobe used forother grinding purposes.

the drawings, l l isthe mechanism housing in which is the driving pulleyilz, mounted on the shaft I 3, and a following pulleyfll l mounted thehousing H. The. shaft, I3 is drivenby a suitable motor arranged tomaintain the belt taut as shown in theabove mentioned patent.

Ap'air of adjustable supporting plates 2| and 22,.pivoted at 23 to the frame 19' and tied to. gether by a rod 24, are located one on each side of the pulley H; and within the housing. Anarcuate arm25 is connected to plate 22 and extends outside the housing where it is. provided heightofwhich is adjustable, the guard being held by the wing nut 3|. i

A sleeve 5|, developed from the top of the housing H; supports the pivot 52 of the inclined guard plate overliesthe belt and is provided with dependent sidewings 55 which passbetween the opposite sides ofthe belt and the housing. One

of these side wings is provided with a horizontal slot 56 to receive the locking lever 51 that is pivotedat 58 to the frame I9: When thetguide plate 53 is brought into the operating or grinding position as indicated in Figs. 2 and 5; the lever" 5T'is moved forwardly into the slot 56 and. rigidly secures theplate 53 withthe loweredge of flange .54 spacedfrom the belt Hi. It is against this the housing. Between the pulleys l2 and t lower edge that the side of the tool or knife engages during rinding; t t

A bail Bllxis provided with the turned-in ends 6|= and 62 which eht'erapertures in the wings of the guide plate 53, forming a pivoted connection therewith. The bail is somewhat wider than the frame so that its crossbar can engage the upper edges of the supporting plates 2| and 22- inone position of the bail. The crossbar or the bail is preferably bent upwards at. the center, as

indicated at 63, Fig. 6, so that when the'bail is provides a single point support for the side of the tool, which point is located centrallyof the abrasivebelt. Usually,the bail is used only for the heavier tools, suchas butchers cleavers, and

The guard the point 63 thereof, as explained above.

otherwise it is swung back upon the guide plate 53, as seen in Figs. 1 to 4.

In operation the supporting plates 2| and 22 may be adjusted to whatever height is best for the particular knife or tool, such as indicated in Fig. 4 for the tool b. This adjustment varies from the position where the upper edges of the supporting plates are substantially in the same plane as the top of the belt l6,'as seen in Fig. 2,

' to a somewhat pronounced angle to the plane of the belt, limited only by the length of the slot 26 in the arm 25. The side of the knife or tool with a pair of belt wheels, one of which is driven to move the belt, an abrasive belt mounted on said wheels, a tool guide comprising a plate pivoted to said housing and overlying said belt and having turned down sides with a slot in one of said sides, a lever pivoted to said housing engaging said slot to position, and lock said plate in the operative position and the forward end of said plate being bent upwards to reinforce the edge of said plate where it engages the tool to holdthe edge of the tool in engagement with the belt.

rests on the upper edges of these supporting plates 2| and 22 as it is being sharpened, unless the bail 60 has been lowered as shown in Fig. 5, in which case the cleaver or other tool rests on It will be understood, of course, that the supporting plates are similarly adjustable when the bail is in the position shown in Fig. 5.

When the guide member 53 is latched in posi tionas indicated in dotted outline in Fig. 4 and in full lines in Fig. 5, the flange 5d forms an abutment for the upper side or face of the tool, while the lower side or face is supported by the adjustable plates 21 and 23 and the belt. In this position the edge of the knife projects under the flange 54 into space which is unobstructed except for the belt 16 that passes therethrough, so that 'the'cutting edge of the tool may be sharpened to infinity for both thin and thick tools. The

, tool'may be drawn back and forth across the belt as indicated at a, Fig. 3, the tool being guided by the lower edge of flange 54, and if the tool is a common table knifewith a polished surface the plates 2| and 22 may be so adjusted as to 4. A grinding machine comprising a housing with a pair of belt wheels, one of which is driven v to move the belt, an abrasive belt mounted on said wheels, a tool rest comprising a bail pivoted to I 1 said housing, said bail when in the operative poprotect the polished surface from the abrasive belt while the edge is being ground. v

The wedge shaped tool d,'Figs'. 5 and 6, may be in the form of a cleavera'nd a three-point support may be preferable for a tool of this type, comprising'a single support on the center line of the belt and the broader support by the belt I 6. When thebelt is to be replaced on the pulleys the guard member 53 is turn'edback and the side" plates 2| and 22 are lowered,'-'making the belt readily accessible from the side of the mechanism which is opened by removal of the cover 64.

Having thus described my invention, I claim: 1. A grinding machine comprising a housing with a pair of belt wheels, one of which is driven to move the belt, an abrasive belt mounted on said wheels, a combined guard and tool guide for said beltcomprising a plate pivoted to said housing and overlying said belt, means for latching said guard in the operative position, means on said guard engaging'the tool to hold the edge of the tool in engagement with the belt when the guard is in latched position; and separate adjustable means for supporting the tool in operative position.

2.-A grindingmachine comprising a housing with a pair of belt wheels, one of which is driven to move the belt, an abrasive belt mounted ong to engage the tool and form a support sition having a single raised portion over the belt about which the tool may pivot.

5. A grinding machine comprising a housing with a pair of belt wheels, one of which is driven to move the belt, an abrasive belt mounted on. said wheels, a tool rest comprisinga bail pivoted to. said housing, adjustable means engaging the free end of the bail to vary its angle relative to the plane of the belt, said bail when in the operative position having a single raised portion.

over .the belt to engage the tool and form a support about which the tool may pivot. 6. A'grinding machinev comprising a. housing with a, pair of belt wheels, one of which is driven to move the belt, an abrasive belt mountedon said wheels, a tool, rest and guard for said belt.

comprising. a plate pivoted to the. housing and extending over said belt, a bail pivoted to said plate, means for locking said plate in the-operative position, means for adjustably supporting the free end of said bail, and means cooperatingwith said ball providing a three point supportfor the tool in the grinding position.

"7. A grinding machine comprising a, housing with a pair of belt wheels, one of which is driven to move the belt, an abrasivebelt mounted onsaid wheels, a tool rest and guard forsaid beltcomprising a plate pivoted to the housing and extending over said belt, abail pivoted to said plate, means for locking said plate in the operative position, said plate having its edge extending at right angles to the line of movement of the-belt, and said bail in the operative position having a single raised portion above the center of thebelt to engage the under side of the top of the tool while the edge of the plate engages the tool to hold it in the grinding position,

8. A grinding machine comprising a housing, with a pair of belt wheels, one of which is driven to move the belt, an abrasive belt mounted onv said, wheels, a tool rest and guard for said belt comprising a plate pivoted to the housing and extending over said belt, a bail pivoted to -said plate, means for locking said plate in the operative position, a pair of adjustable plates also pivoted to said housing with their edges adjustwe able relative to the plane of the belt, means for adjusting the position of said last mentioned plates, the free end of said bail resting upon said plates and providing with the'edge of the firstmentioned-plate a support and guide for the tool in the grinding position.

9. A grinding machine comprising a housing with a pair of belt wheels, one of which is driven to move the belt, an abrasive belt mounted on said wheels, a rest for the tool in the grinding position, comprising a pair of plates pivoted to said housing with their edges adjustable relative to the plane of the belt, means for adjusting the 11. In a grinding machine, a housing, a pair of i belt wheels mounted therein, one of which is position of said plates, and a member adjustably supported by said plates and engaging the tool above the center line of the belt to support the tool in the grinding position. p 10. In a grinding machine, a housing, a, pair of belt wheels mounted therein, one of which is driven to move a belt, an endless abrasivebelt rotated by said wheels, a tool guide extending across the belt and fixed in spaced relation thereto, and a tool support adjustable relative to the plane of the belt without adjusting the guide, the

support cooperating with said guide in its several adjusted positions so that the tool can enter said space and engage the belt according to the desired angle of the particular cutting edge.

driven to move a belt, an endless abrasive belt rotated by said wheels, a tool guide extending across the belt and fixed in spaced relation thereposition to provide a single point support on the i side of the males it is being sharpened, while the end of the tool is supported on the belt and guid-V ed by the tool guide. 7

' CLARENCE R. WILLIAMS.

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