US1958498A - Valve grinder - Google Patents

Description

E. RYDER VALVE- GRINDER May 15, 1934.

Filed May 15, 1933 INVENTOR.

ATTORNEYS.

Patented May 15, 1934 UNITED STATES PATENT OFFICE 8 Claims.

The invention relates to improvements in valve grinders, and in the novel details of construction in which the valve is intermittently or periodically rotated in opposite directions.

Among the objects of the present invention is to provide a novel construction of valve grinder in which the direction of rotation of the valve being ground is periodically reversed. Such reversal is automatically accomplished by a driving means in which the operating handle is continuously rotated in one direction.

A further object is to provide a novel gear mechanism so constructed and arranged that during the reversal of the operating shaft, the valve at the end of its path of any rotative period, will not be in the same angular position as at the beginning of such period, whereby the valve will be ground evenly throughout its seat.

Another object of the invention is the provigg sion of a novel construction of sectional housing provided with adjusting means to adjust the tool or .driven shaft and the pinion gears carried thereby. Such adjustability permits accurate adjustment and alignment of the gears into 2* their proper meshing relationship without the necessity of costly and accurate grinding .'or machining of the gears as is the case where no adjustment is provided for. It also permits adjustment of the gears to eliminate noise resulting from their engagement and operation.

A still further object of the invention is the provision of a novel means of braking .the tool shaft in its neutral position to prevent spinning of'the shaft and improper meshing of the gear teeth. This novel construction and arrangement permits continuous and unimpeded rotation of the operating handle at all speeds.

Yet another object of the invention is to provide a novel construction of bit or valve engaging member or tool provided with differently spaced projections on all four sides thereof, thus eliminating the necessity of stocking a plurality of bits.

Further objects are to provide a construction of maximum simplicity, efficiency, and ease of assembly, operation and maintenance, and such further objects, advantages and capabilities as will later more fully appear, and as are inherently possessed thereby.

The invention further resides in the combination, construction and arrangements of .parts illustrated in the accompanying drawing, and whilethere is shown therein a preferred embodiment, it is to be understood that the same is susceptible of modification and change, and comprehends other details and constructions, without departing from the spirit .of the invention.

In the drawing:

Fig. l is a view in perspective of the valve grinder in operative position, the shaft thereof being provided with an extension.

Fig. 2 is a vertical cross sectional view through the grinder but omitting the extension.

Fig. 3 is a vertical cross sectional view through the grinder taken at right angles to Fig. 2.

Fig. .4 is a view in perspective .of an extension for the shaft.

Referring more particularly to the disclosure in the drawing, the novel valve grinder is provided with a casing 01' housing formed of cupshaped sections 1 and 2 having a gripping handle or grasping portion 3 and a handle 4 adapted to be rotated. This handle .4 may be rotated continuously in .either direction.

Mounted within one of the cup-shaped sections .of the housing is .a gear 5 formed or provided with an arcuate rack having bevelled teeth 6. The teeth 7 at the end .of this rack have their outer portion cut away or mutilated.

Extending centrally through the housing or casing is a tool or operating shaft 8 having its upper end seated in a bearing member 9 and intermediate its ends in a second bearing member 10. oppositely faced pinion gears 11 and 12 are mounted on or keyed to the shaft and drive the same. These piniongears alternately mesh with the outer portions of teeth 6, and with the teeth 7 and the inner portionsof teeth 6, respectively, and, although the gear 5 is continuously rotated in onedirection, .the meshing of its teeth intermittentlyor periodically with the oppositely .faced pinion gears 11 and 12 drives these pinions in opposite directions whereby the shaft 8 is given an oscillatory or alternately rotating movement.

The arcuate rack operates as though it consisted of two .concentric sets of teeth since the outer portionsof the iteeth16 mesh with and drive the pinion 12, while the inner portions of these teeth and the teeth '7 engage and drive the pinpinion gears 11 and 12.

the pinion 12, start in engagement or mesh therewith. Although the two pinion gears have the same pitch diameter, by reason of the present construction, the valve will not be in the same angular position that it was in at the beginning of the previous period of rotation for the reason that the operative portions or lengths of teeth in the rack have different radii. The relationship of the parts is such that the valve being ground will be first rotated through a certain arc or number of degrees in one direction, and then rotated through a different are or number of degrees in the opposite direction so that the valve will always occupy a different position, and the angle of rotation will be such that the valve will be stopped at a different position than it occupied at the moment of its previous reversal.

Thus the valve will be ground evenly throughout its seat.

In order to maintain the operating or tool shaft 8, after the disengagement of one of the pinionswith its respective teeth on the driving gear, in the correct position for the engagement of the other pinion with its set of teeth on the driving gear, or in other words, when the gears are in neutral position, the invention comprehends the provision of the gear 5 with suitably spaced raised portions or cam surfaces 13 and 14 adapted to contactingly engage during the rotation of the gear 5, with a complementary cam surface v15 provided on an arm 16, one end of this arm being suitably connected as at 1'7 to the housing and its other end 18 being adapted to frictionally engage the shaft 8 intermediate the Thus, as the complementary cam surfaceson the gear 5 and arm .16 come into engagement, which is at the time that the gears are in neutral position and before they reverse their direction, the end 18 of the arm will be raised and will frictionally engage the shaft and stop its rotation and maintain the same in a position for the proper engagement of the other'set of gears.

A ball or thrust bearing 19 is adapted to seat against the upper end of the shaft 8. This thrust bearing tends to minimize the friction resulting in the placing of pressure upon'the grinder when it is being operated. A spring 20 is adapted'to seat against the end of the thrust bearing 19 and the tension on this hearing may be adjusted b means of a bolt or adjusting screw 21. v

. The bearings 9 and 10 are each provided with an annular groove or channel 22 adapted toreceive the cup-shaped sections. 1 and 2 of the housing or casing. These sections are provided at their top and bottom with a semi-circular cut-out portion to seat in the channels 22 and permit these sections to entirely enclose the inner mechanism of the grinder.

Each of the bearings 9 and 10 is provided with oppositely extending threaded pins or bolts 23 adapted to, extend through openings in the sections 1 and 2. Adjusting nuts 24 are mounted on the outer ends of these pins or bolts 23 whereby to permit proper adjustment of the shaft and its pinion gears with respect to the sections.

' By proper manipulation and adjustment of the nuts 24'it ispossible to accurately mesh the gear -5 and pinions 11 and 12. Such an adjustment and alignment of the gears minimizes or eliminates noise resulting from the engagement of the gears and their operation. It also permits adjustment and accurate alignment of the gears into their-proper meshing relationship without the necessity of costly and accurate grinding or .ing engagement during the reversing operation.

In order to further eliminate or minimize noise resulting from the operation of the mechanism,

the embodiment selected to illustrate the invention is provided with a washer 25 of fibre or like material adapted to seat against the rear face of the gear 5 and between this member and a block or bearing member 26. A washer 27 also seats intermediate the handle 4 and the section 1 of the housing.

The end of the shaft 8 is slotted as at 28 whereby to receive a valve engaging bit or member 29. Openings are also provided in the shaft at right angles to the slot 28 for the reception of a bolt 30 for holding the bit in position, or a cotter pin 31 for retaining a shaft extension.

As clearly disclosed in Fig. 3, this bit is provided with suitably spaced openings 32 for. the passage of the bolt or other retaining member. The edges or sides of the bit 29 are provided with projections 33, the spacing of which varies so as to permit the bit to be used in the grinding of valves 34 having differently spaced slots or openings for the reception of the projections 33 on the bit. The valve 34 is shown in Fig. 3 seating in the motor block or casting 35.

In order to secure access to and grind a valve which is inaccessible with the regulation length of shaft 8, as when studs 36 extend upwardly a substantial distance from the motor block or casting after the head thereof has been removed, the invention comprehends the provision of an extension 37 having a reduced end 38 adapted to seat within a cylindrical opening in the end of the shaft 8 and is connected to the shaft by means of a cotter pin 31. The end of this extension is provided with a slot 28 similar to the slot 28 in the main shaft and is adapted to receive the bit 29.

From the above description and disclosure, it will be readily apparent that the invention comprehends a novel construction of valve grinder which .may be economically constructed and which eliminates the necessity and cost incident to the accurate grinding of the teeth of the meshing gears, permitting their proper adjustment by means on the casing or housing carrying the mechanism.

Having thus disclosed the invention, I claim:

. 1. In a valve grinder provided with a shaft and a valve engaging tool, a driving gear, driven gears fixed on said shaft and in engagement with said driving gear, a sectional housing encasing said gears, and adjusting means in said housing and engaging said shaft to adjust the meshing engagement between the teeth of said gears.

2. In a valve grinder provided with a shaft and a valve engaging tool, a driving gear, driven gears keyed to said shaft and in engagement with said driving gear whereby to oscillate said shaft and 1 tool, a sectional casing comprising a pair of cupshaped members adapted to house said gears, and adjusting means on said members to adjust the meshing engagement between the teeth of said gears.

3. In a valve grinder provided with a shaft and J v a valve engaging tool, a driving gear, driven gears fixed to said shaft and in engagement with said driving gear to oscillate said shaft and tool, spaced bearings for said shaft, and a casing housing said gears and seating in said bearing members, and nuts adapted to be manually adjusted from the exterior of the casing to shift the bearings and shaft for adjusting the engagement between the teeth of said driving and driven gears.

4. In a valve grinder provided with a shaft and a valve engaging tool for reciprocating the valve, a manually rotatable driving gear, driven gears keyed to said shaft and adapted to mesh with teeth on said driving gear, a sectional housing enclosing said gears, and means adjustable from the exterior of said housing for adjusting the shaft to accurately adjust the intermeshing relationship between the teeth on said gears and thereby reduce friction and noise in their operation.

5. In a valve grinder provided with a shaft and a valve engaging tool for reciprocating the valve, a manually rotatable driving gear, driven gears keyed to said shaft and adapted to mesh with teeth on said driving gear, bearing members for said shaft, a housing enclosing said gears and encompassing and retaining said bearing members in spaced relation, and means on said bearing members and extending to the exterior of said housing for adjusting the position of said bearing members and gears to reduce unnecessary friction between the interengaging teeth on said driving and driven gears and minimize noise resulting therefrom.

6. In a valve grinder provided with an oscillating shaft and a valve engaging tool adapted to seat on the valve and oscillate the same, a driving gear, a pair of driven gears spaced upon and mounted on said shaft, said driven gears intermittently meshing with teeth on said driving gear whereby said shaft is given an oscillatory motion, an arm member adapted to frictionaly engage and apply a braking force to said shaft intermediate said driven gears to stop rotation of the shaft and maintain it in neutral position during the period preceding reversal of rotation of the shaft whereby the teeth of said gears are in their proper angular position for engagement, and a cam on said arm adapted to engage said driving gear to cause said frictional engagement with said shaft.

7. In a valve grinder provided with an alternating shaft and a valve engaging bit, a driving gear provided with a segmental, annular rack, pinions mounted on said shaft in spaced relation and adapted to alternately mesh with the inner and outer toothed portions of said rack whereby to alternately rotate said pinions and shaft in opposite directions, a housing enclosing said gear and pinions, an arm member mounted on said casing, and cam members on said gear and arm adapted to force said arm into frictional engagement with said shaft to stop and maintain it, after disengagement of one pinion from the teeth of the gear, in correct angular position for the engagement of the other pinion with the gear.

8. In a valve grinder provided with a shaft and a valve engaging tool, a driving gear, driven gears keyed to said shaft and adapted to be alternately engaged by said driving gear, a casing enclosing said gears, an arm mounted on said casing, a free end of said arm being adapted to frictionally engage said shaft to stop the rotation of the same, and means for causing said frictional engagement comprising a cam on said driving gear and a cam intermediate the ends of said arm and adapted to contact said other cam while said gears are disengaged to force said arm against said shaft.

ELMER RYDER.

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