US2916856A

US2916856A - Grinding machine

Info

Publication number: US2916856A
Application number: US695162A
Authority: US
Inventors: Sr Karl R Olofson
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1957-11-07
Filing date: 1957-11-07
Publication date: 1959-12-15
Anticipated expiration: 1976-12-15

Description

Dec. 15, 1959 K. R. oLoFsoN, SR 5 GRINDING MACHINE Filed Nov. 7, 1957 3 Sheets-Sheet 1 i, .ZVVENTUQ r A. P. OLOFSON, SR.

FTTCJQNE Dec. 15, 1959 K. R. OLOFSON, SR

GRINDING MACHINE 5 Sheets-Sheet 2 Filed Nov. 7, 1957 j/vvEA/ U K. R. OLOFSON, SR.

7- ug N155 Dec. 15, 1959 K. R. OLOFSON, SR 2,916,856

GRINDING MACHINE Filed Nov. 7, 1957 3 sheets sheet 3 JNVE'N 713/; K R. OLOFSON, SR.

J: T U /vgg United States Patent -O 2,916,856 .cnnsnnsc MACHINE :Kai-l R. Olofson, Sr., Laurelton, N.Y., assignor to Western Electric Company, Incorporated, New York, N.Y., a "corporation of New York ,This invention relates to apparatus for grinding articles particularly gaffs of linemens climbers.

The 'gatfs of linemens' climbers are mounted initially on the climbers with the outer andinner surfaces disposed at the particular angles with respect .to eachother and the vertical leg portionsaof the climbers which renderthem most efficient. Asa result of frequent use, the gaffs become worn and must be sharpened. r Manual sharpening of the gaifs has proven unsatisfactory in that, with this method, it is difiicult to maintain'the preferred angles of the surfacesof the gaffs and particularly to cause the gaifs-in each pair of climbers to remain identical.

An object of the-present. invention is a grinding-apparatus capable of efficiently and accurately grinding articles to maintain known relations between the surfaces of the articles. I

In accordance with the objectof .the invention th apparatus is adapted'for grinding first and second surfaces of an article wherein the first surface is to be disposed at a predetermined angle with respect to a reference surface of the article, 7 the apparatus including a rotatable grinding wheel having a grinding facedisposed in a given plane, and means to support the article with the reference at the predetermined. angle with respect to the planeso that thefirst surface will be ground at the desired angle with respect to the reference surface.

In the present instance the outer surfaceofthe gaff is secured against locating members to position that outer surface at a desired angle with respect to, the plane of the grinding face. This supporting meansis mounted upon a carriage, the carriage being disposed upon a support and movable about a centerline disposed in the plane of the grinding surface. During grinding of the first vsurface of the gaff, the carriageis fixed or latched to the support and permitted to rock with'the support about a shaft on which micrometer means is disposed for moving the support axiallyon the shaft and to measurably feed the first surface to the grinding face of the grinding wheel. After the first surface has been ground,

the carriage may be unlatched from thesupport and rotated about the centerline of its connection with the support to grind a radius on the end of the gaff.

Other objects and advantages will be apparentfrom the following detailed description when considered in conjunction with the accompanying drawings, wherein:

Fig.1 is a top plan view of the apparatus shown grinding the first surface;

Fig. 2 is a side elevational view of the apparatus illustrating the location of the article for grinding;

Fig. 3 is a fragmentary detailed view of the locating means of the apparatus;

Fig. 4 is a fragmentary sectional view'taken substantially. along line 4-,4 of vFig.2, and

Fig. 5.is a top plan 'view of the apparatus illustrating grinding of the secondsurface.

a. The apparatus. includes a grinding wheel. driven continuouslyby a motor 11 andp of the special-contour 2,916,856 Patented Dec. 1959 ishown wherebyits-grinding face 12 is'disposed in a'given plane and the peripheral-surface 14- falls away sharply from its outer edge 15 to permit. the grinding; wheel to enter the limited space provided'in the article to be ground. I

' In the present instance the article to be ground is a gaff 17 of a linemans climber 18, the gaff having an outer reference surface 19,an inner or first surface 20 and-a second surface 21. :The article or climber 18 is positioned to rest upon ablock-like member 23- whichis mounted upon-a carriage 24, 'the carriage being a rectangular plate-like member disposed upon a support 25. The support 25 has. an integral-collar -26 disposed-upon a shaft 27 and split. at 28,'Fig. 4, and held with sufficient firmness on the shaft by' screws- 29 to permit rocking movement throdghflthe-application of suitable force' to a handle 30', fixed to the-member 23, but -to-preventfree rocking motion .of the support on --the shaft' when the handle-is released. The carriage24, Fig. 2, is pivotally connected to the support 25 by a spindle-like member '32 fixed to the c'arriag e, extending downwardly through an aperture or bushing in thesupport 25 where the lower threaded end is provided with a nut 33 adjustable against a spring 34 toapply a force to the under surface of the support25, or to a washer interposed between the spring and thessupport to hold the carriage pivotally -for-=the support. The pivotal axis of the spindle-like membei' -SZ 'is substantially in the plane of thegrinding-face 12.

The shaft27 has one end' fixedly mounted ina'istationary supp'ort iifi and extends-laterally at right angles of 'the'planeto'the grinding face 12. A spring 37, interposed between thesupport 36 and the split collar-26,- normally urges thesupport 25 outwardly. Microrneter .members 39 and40 are mounted upon a threaded portion -of the micrometer member 39 on the shaft to move it awaynfrom the rnember :40 willmove the support 25, and eventually: the article; to' feed the" first surface '20 a measured ':distance:;-towardflthe grinding face 1'2. The member:- 401 is: lockeda-inuany' adjusted; position by a threaded element 44.positioned in a threaded aperture of the member lliZ to engage the end of the shaft-and thereby 'lock the membeniAO against rotation on theshaft. The micrometer rnember 39'= is racked: on the shaft through the aid of a handle 45 and carries a p'ointer 46. The pointer 46 is of a resilient nature adapting the free end .to ride on alsurface 47 'ofthe member 40. and to move .into and out of notches 4810 indicate measured distances, any one of which may. beselected for the grinding of the vflirst'surface. Other markings 49 adjacent the periphery of the member =4tl mayxbe utilized in the adjustments made necessary for taking up wear in the grindingface.

T A locatingunit-Sfl is mounted at a predetermined'angle .on" the member 23 and has locating screws 51 disposed at spaced positions along its inner face. The outer'ends' of the screws 51 are engaged by the outer or reference surface of the gaff 17. In reality, the outer surface 19 of the gait is an edge in that the gaif is substantially triangular in cross section, locating'the edge or surface 19 at: theapexof multitudinous cross-sectional triangles and thesurface20 at thebases of approximately /3 of the cross-sectional"triangles.1: Initially, the base surface 20 is disposed at a given anglerelative to the apex edge'or surface: 19 and..the second surface 21 is. rounded to a point. After much. :USCp-lhfi .gaif becomes? dull, disturb- .ing mostly the surfaces 20 and 21. In sharpening; the gaff, the surfaces 20 and 21, must be ground, as .nearly as possible to their initial angles and contours relative to the apex or surfaces 19. An arcuate holder 53 is mounted adjacent its center on the inner surface of the member 50 through theaid of screws -54 An enlarged opening '55, Fig. 3, is provided in the member 53 for the adjacent locating screw 51 and V-shaped notches 56 are formed in the outer ends of the member 53 to receive the adjacent portions of the gaff. The holder 53,

formed of spring steel and being of a resilient nature,

;may be compressed during mounting of the article or gaff. The holder centers the edge or reference surface 19 on the locating screws 51. Another locating means or stop 58 is carried by an L-shaped arm 59, pivotally mounted at 60 on the member 50 and movable about the ,pivot from the position shown in Fig. 1, to the position shown in Figs. 2 and 3. When in the position shown in Figs. 2 and 3, a spring actuated pin 61'may enter a tapered groove 62 and forced outwardly thereby to ride on the upper surface of the member 50 until it reaches an aperture '63, at which time it will be forced by its spring, not shown, into the aperture to temporarily latch the locating member 58 in position to be engaged by the point or adjacent surface 21 of the gaff 17. This is the means for positioning the article longitudinally in the holder 53 prior to being clamped in place. The detailed structure of the spring means back of the pin 61 and the inner structure of the movable knob 64 for removing the pin from the aperture are not shown but any conventional means for accomplishing this result may be employed.

An eccentric clamp indicated generally at 65 includes a pair of friction wheel-like members 66, only one of which is shown, rotatably mounted on the upper and lower ends of an element 67, which is eccentrically mounted for rotation on a spindle 68, the spindle being fixed to the top surface of the member 23. A handle 69 fixed to the element 67 for imparting rocking motion of the element about its spindle 68 will cause the friction members 66 to move into and out of clamping engagement with the article 16 to force it, for example, toward the member 50 and particularly force the gaff 17 against the locating holder 53 to compress it and permit the reference surface 19 to engage the locating members 51. A spring-like member 70, fixed at 71 to the outer surface of the member 50 and assisted by a spring 72, is notched at 73 adjacent its outer end to receive the outer portion -of the article and to assist in holding the article in place without disturbing the accurate location of the particular portion or gaff to be ground. The mounting of the article, the location of the portion to be ground with respect to the grinding face and the feeding of the article through the micrometer structure, the first surface 20.

The carriage 24-is locked on the support 25 during the mounting of the article and the grinding of the first surface. However, Without changing this arrangement, other than conditioning the carriage 24 for rocking motion about its pivot 32, the second surface 21 may be ground to provide it with a desired radius. This is accomplished by moving a latch pin 75 from a notch 76 in the support 25, Fig. 1. The latch pin 75 normally secures the carriage 24 to the support 25 and is carried by an arm 77 supported on a pivot 78, Fig. 2, and held against accidental movement by a spring 79. After the latch pin 75 is moved outwardly free of the notch 76, the carriage may be rocked about the shaft 27 to position the surface 21 adjacent the grinding face 12 and by terminating the rocking motion of the carriage about the shaft 27 but continuing its rocking motion about its .centerline or pivot 32, a desired radius may be'formed in the surface 21. If desired, the carriage 24 may be moved to a desired position spaced from the notch 76 to grind -a surface of a given angle represented by the second surface 21, this angle being at a known position with respect to the reference surface 19. e

are concentrated upon During operation of the apparatus it is apparent that the articles such as gatfs of linemens climbers may be mounted readily successively in the apparatus by the use of the locating element 58, with the locking means 65 in open position, after which the article may be locked in position with the holder 53 assuring location of the reference surface 19 on the locating elements 51. When the article is located in place and locked in position, the element 58 may be moved into the position shown in Fig. 1, and the apparatus actuated by rocking motions, imparted thereto through the aid of the handle 30, about the shaft 27. The first surface 20 is being ground with the latch pin in the notch 76 and during the rocking motions to move the surface 20 relative to the grinding face 12. The first surface may be fed laterally toward the grinding face through rocking motion of the micrometer member 39 until the pointer 46 is moved a predetermined number of notches 48. After this grinding operation has been completed, the support may be rocked to move the article away from the grinding surface until the latch pin 75 is released from the notch 76. At this time, the carriage may be rocked to bring the surface 21 into engagement with the grinding face 20 and during rocking motion of the carriage a predetermined radius will be ground on the surface 21.

It is to be understood that the above described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is: p

1. An apparatus for grinding first and second surfaces of the gaff of a linemans climber to predetermined contours relative to the outer reference surface of the gaff, the apparatus comprising a rotatable grinding wheel having a grinding face disposed in a given plane, a shaft mounted at right angles to the plane, a support roclzably mounted on the shaft, a carriage resting on the support and movable thereon about a centerline lying in the plane, locating means on the carriage, means supported by the carriage to secure the linemans climber in place thereon with the reference surface of the gaff thereof lying in a given plane against the locating means, means to locate the carriage on the support prior to intervals for grinding by movement of the carriage about the centerline to locate the plane of the reference surface of the gaff at a predetermined angle from the plane of the grinding face so that the first surface may be ground at a required angle relative to the reference surface by rocking the carriage on the shaft, and means to cause rocking of the carriage on the support about the centerline to grind the second surface with a given radius.

2. An apparatus for sharpening gaffs of linemens climbers, each gaff being substantially triangular in cross section with a base surface initially extending at a given angle relative to an apex outer edge and joining the outer edge at the free end of the gaff by a curved surface, comprising a rotatable grinding wheel having a grinding face disposed in a given plane, a shaft mounted at right angles to the plane, a support rockably mounted on the shaft, a carriage resting on the support and movable thereon about a centerline lying in the plane, locating members on the carriage for the apex outer edge, a resilient V- grooved element to receive the apex outer edge of the gaff and guide it to the locating members, actuable' means supported by the carriage to secure a linemans climber thereon with the apex outer edge of the gaff thereof lying in a given plane against the locating members to position the base surface substantially in the plane of the grinding wheel, and means actuable to move the support axially on the shaft to control the depth of cut of the grinding surface on the base surface of the gaff.

3. An apparatus for sharpening gaifs of linemens section with a base surface initially extending at a given angle relative to an apex outer edge and joining the outer edge at the free end of the gaff by a curved surface, comprising a rotatable grinding Wheel having a grinding face disposed in a given plane, a shaft mounted at right angles to the plane, a support rockably mounted on the shaft, a carriage resting on the support and movable thereon about a centerline lying in the plane, locating members on the carriage for the apex outer edge, a resilient V- grooved element to receive the apex outer edge of the gaff and guide it to the locating members, actuable means supported by the carriage to secure a linemans climber thereon with the apex outer edge of the gaff thereof lying in a given plane against the locating members to position References Cited in the file of this patent UNlTED STATES PATENTS 2,144,095 Zwick Jan. 17, 1939 2,454,472 Monkley Nov. 23, 1948 2,846,908 Kelly Aug. 12, 1958