US878755A

US878755A - Cam.

Info

Publication number: US878755A
Application number: US35872407A
Authority: US
Inventors: James Charles Hoskins Vaught
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-02-21
Filing date: 1907-02-21
Publication date: 1908-02-11
Anticipated expiration: 1925-02-11

Description

PATENTED FEB.11, 1908. Jio. H.'VAUGHT.

G'AM.

- APPLICATION FILED NOV.21, 1903. RENEWED FEB. 21, 1907.

JAMES CHARLES HOSKINS VAUGH'I, OF LEAD, SOUTH DAKOTA.

CAM.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed November 21' 1903. Serial No. 182.177- Renewed February 21. 1907- Serial No. 358.724.

To all whom it may concern:

Be it known that 1, JAMES OriAnLEs Hos- KINS VAUGHT, citizen of the United States, residing at Lead, in the county of Lawrence and State of South Dakota, have invented a new and useful Cam for Stampc /lills, of which the following is a specification.

The invention relates to improvements in cams for stamp mills.

The object of the presentinvention is to im prove the construction of cams for stamp mills and to provide a simple and comparatively inexpensive one of great strength and durability, adapted to be readily applied to and removed from a cam shaft.

A further object of the invention is to provide means for enabling a cam to engage a cam shaftautomatically with a grip varying with the weight or pressure to which the cam is subjected, whereby the same will be effectually prevented from slipping on the cam shaft while a stamp mill is in operation.

Another object of the invention is to enable a cam to be readily loosened by a com paratively light tap of a hammer forcing it in a backward direction.

With these and other objects in view, the

invention consists in the construction and shoes.

novel combination and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawing, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size, and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing :Figure 1 is a side view of a cam constructed in accordance with this invention and shown a plied to a cam shaft. Fig. 2 is a plan view of the same. Fig. 3 is a sectional view on the line 8-3 of Fig. 2. Fig. 4 is a sectional view taken substantially on the line 44 of Fig. 1. Fig. 5 is a transverse sectional view on the line 5-5 of Fig. 1. Fig. 6 is a detail view of one of the removable Fig. 7 is a detail view of one of the arms of the cam illustrating the construction of the longitudinal rib with which the removable shoe is interlocked. Fig. 8 is a detail view of the U-shaped spring for holding the removable shoe in engagement with the longitudinal rib of the cam. Fig. 9 is a detail view illustrating a modification of the invention. Fig. 10 is a detail perspective view of an eccentric wedge illustrating another modification of the invention.

Like numerals of reference designate corresponding parts in all the figures of the drawing.

'1 designates a cam provided with oppositely disposed arms 2, enlarged at their peripheral portions 3 and provided with narrow or reduced body portions 4, which are strengthened or reinforced at opposite sides by laterally projecting approximately parallel ribs 5, which are formed integral with the body portion of the arm and which are spaced apart, as'clearly illustrated in Fig. 5 of the drawing. These ribs enable the cam to be made comparatively light without sacrificing any of the necessary strength and they reduce the amount of metal and, thereby lessen the cost of the cam. The arms 2 are of the usual form and oppositely curved, as clearly shown in Fig. 1 of the drawing, and the ribs extend from the hub or central portion of the cam to the outer ends of the arms at the concave edges thereof.

Each arm is provided at its engaging concave face with a removable shoe 6, forming a wear-plate and adapted to receive the wear incident to the engagement of the cam with a tappet and capable of being readily removed and renewed without discardingthe body portion of the cam. The shoe 6 is curved to conform to the configuration of the adjacent face of the arm of the cam, and the latter is provided at its convex face or edge with a curved longitudinal rib 7, formed integral with the cam and fitting within a groove 8 of the shoe, whereby the latter is detachably interlocked with the cam. The groove 8 is formed in the inner concave face of the shoe and it is provided at intervals with opposite recesses 9 adapted to receivetapering enlargements or lugs 10, located at opposite sides ofthe longitudinal rib. The recesses 9 are tapering and the lugs 10 form tapering enlargements of the ribs. The side edges of the tapering recesses areundercut or inclined to form dovetailed portions, and the tapering enlargements of the rib have inclined side edges which are interlocked with the side walls of the recesses by sliding the shoe outward on the arm of the cam. This movement firmly interlocks the removable shoe with the arm of the cam, and the pres ,sure resulting from the engagement of the cam with a tappet will operate to force the shoe tightly in engagement with the lugs or v enlargements of the rib, whereby the shoe at each, revolution of the cam.

will be effectually prevented from becoming accidentally disengaged from the cam while the stamp mill is in operation. After the shoe has been moved outwardly suffi ciently to interlock it with the arm, a spring 12, is placedbetween the inner end of the shoe and the body of the cam, which is provided with a shoulder 13. The inner end 14 of the shoe is grooved to receive the sides of the spring, which is approximately U-shaped and which is compressed when placed in position. The spring is adapted to be readily removed when it is desired to detach the shoe, and instead of employing a spring, any other form of locking means may be'provided for this purpose.

The shoe, as illustrated in Fig. 2 of the drawing, is provided in its outer conveX face with a series of longitudinal grooves 15 adapted to receive and hold a quantity of lubricating compound or composition, where by the parts will be automaticallylubricated This will obviate the necessity of frequent lubrication of the cam by hand.

The cam is provided with an eye '16 for the reception of a cam-shaft 17, and the body of the cam is centrally enlarged to form a hub extension 18. The eye receives a pair of reversely-arranged

eccentric wedges

19 and 20, which are curved, and which taper from one side edge to the other. These curved wedges, which have an. opening between them for the cam-shaft, present inner concave faces to the same and outer convex faces to the walls of the eye 16, and they are preferably provided at their ends with outwardly-extending curved flanges 21, forming grooves for receiving the body of the cam,

whereby the wedges are retained in position in the eye of the cam, and are held against endwise movement. The wedge 19 is pro vided at its inner concave cam shaft engaging face with alligator teeth 22, approximately similarto those of an alligator wrench and adapted to engage the cam shaft, whereby the wedge is prevented from slipping backward when the cam is subjected to the pressure resulting from the engagement of the cam with a tappet. The wedge 19 is also provided at its outer convex face with alligator teeth for engaging the wall of the eye. The other wedge 20 is provided at its convex face with similar teeth 23 for engaging the wall of the eye of .the cam, whereby the wedge 20 is prevented from slipping. The concave face of the wedge 20 is provided with alligator teeth for engaging the shaft. The eccentric wedges are separated at each side edge by an interspace and are thus adapted to grip tightly the cam shaft, and they are capable of effectually preventing the cam from slipping, and the greater the pressure to which the cam is subjected the greater will be the gripping action of the eccentric wedges. Instead of providing teeth, the surfaces of the eccentric wedges may be corrugated or otherwise roughened to enable them to engage the cam shaftand the Walls of the eye of the cam. Also, as illustrated in Fig. 9 of the drawing, a dowel-pin 24 may be employed, the wedge 25 and the wall of the eye being provided with opposite grooves, as shown. This will enable the outer face of the wedge 25 to be made smooth, as the dowel-pin or key will prevent the wedge from slipping. The inner face of the wedge 25 may be made smooth, as shown in Fig. 9, and the opposite wedge 26, may have a smooth outer face, as shown in this figure of the drawing, teeth 27 being provided at the inner concave face of the wedge 26 for engaging the cam shaft. With a cam having Wedges constructed substantially, as shown in Fig. 9, a slight blow of a hammer on one end of the cam, forcing it backward, will loosen the same, and the cam may then be readily removed when the cam shaft is re moved from its bearings.

WVheri it is desired to provide means for positively locking the cam against movement in either direction, the outer face of the wedge 19 may as illustrated in Fig. 1 be provided with teeth 28 and the inner face of the wedge 20 may be provided with teeth 29. The teeth at the inner face of the wedge 19 are adapted to engage the cam shaftto pre vent the cam from slipping backward. when engaging a tappet, and the teeth at the outer face of the wedge 19 are arranged to engage the wall of the eye of the cam and will prevent the latter from moving in an opposite direction on the wedge. The teeth of the other wedge 20' are arranged the reverse of those of the wedge 19, the outer face of the wedge 20 being arranged to engage the cam when the latter is subjected to pressure incident to the engagement of the cam with a tappet, and the teeth at the inner face of the wedge being adapted to resist movement in the opposite direction. These wedges are alligator applicable to pulleys and other rotary de" I vices where it is desirable to look a member rigidly with a shaft, and if desired, a plurality of wedges, consisting of a combination of those in Figs. 1 and 9, may be employed. Also, as illustrated in Fig. 10, a wedge may be used having circular ribs or teeth '30 to engage the cam shaft and prevent the cam from moving laterally on the cam shaft.

In assembling the parts, the wedges are placed within the eye of the cam before the cam shaft is introduced into the opening or space between the wedges, and one of the flanges 21 of each wedge will be reduced atthe terminals, as illustrated in Figs. 4. and 10, to enable the wedge to be introduced into the eye of the cam.

7 It will be seen that the cam is exceedingly simple, and inexpensive in construction, that it is light, strong and durable, and that the removable shoes, which receive the wear and which may be renewed when worn, are detachably interlocked with the body portion of the cam and are adapted to be readily applied thereto and removed therefrom. Also, it will be apparent that the removable shoes render the body portion of the cam practically indestructible, and that the grooves of the shoe are adapted to hold a quantity of lubricating compound or material to obviate the necessity of frequent lubrication by hand and to prevent wear and, thereby increase the length of life of the shoes. Furthermore, it will be clear that the eccentrically arranged wedges are adapted to securely lock the cam to a cam shaft, that the greater the pressure to which the cam is subjected the greater will be the gripping action of the wedges, and that they will permit a cam to be readily removed when desired.

Having thus fully described my invention, what I claim as new, and desire to secure by' Letters Patent, is 2- 1.. In a device of the class described, the combination of a body provided with an eye, andreversely-disposed eccentrically-arranged curved wedges tapered from one side edge to the other and fitting within the eye and having an opening between them for a shaft, said wedges being provided with means for positively engaging the shaft and the body, and also with means for holding the wedges against endwise movement.

2. In a device of the class described, the combination of a body provided with an eye, and reversely disposed eccentrically arranged curved wedges tapered from oneside edge to the other and spaced apart at their side edges and fitting within the eye and having an opening between them for a l shaft, one of the wedges being provided at its inner face with means for positively engaging the shaft, and the other wedge being provided at its outer face with means for engaging the body.

3. In a device of the class described, the combination of a body provided with an eye, reversely disposed eccentrically arranged curved wedges tapered from one side edge to the other and spaced apart at their side edges and fitting within the eye and having an opening between them for a shaft, one of the wedges being provided at its inner face with teeth for engaging the shaft, and a dowel pin arranged at the outer face of the other wedge and engaging the body. a

4. In a device of the class described, the combination of a body having an eye, and reversely disposed eccentrically arranged curved wedges, spaced apart and ta ered from one side edge to the other and fitting within the eye and having an opening between them to receive a shaft, said wedges being provided at their ends with exterior flanges located at both of the side faces of the body and engaging the same, whereby the Wedges are held against movement laterally of the body.

5. In a device of the class described, the combination of a body provided with an eye adapted to receive a shaft, and reverselydisposed eccentrically arranged curved wedges tapered from one side edge to the other and located within the eye and having an opening between them for the shaft and engaging the same and the walls of theeye, said wedges being extended entirely through the eye and provided at both ends with outwardly projecting flanges which engage the body, whereby the wedges are held against movement laterally of the said body.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

JAMES CHARLES HOSKINS VAUGHT.

Witnesses:

FRANK J. Wrcennr, EDWARD F. PAOA.