US1486144A - Extension rack - Google Patents

Description

' March 1'1, 1924. 1,486,144

L. P. JARRELL EXTENSION RACK Filed July 25 1923 2 SheQts-Sheet 1 INVENTOR Much 11 1924. Y1,486,144

L. P. JARRELL.

EXTENSION RACK Filed July 25. 1923 2 sheets-sheet 2V WITNEssEs A'rroRNEY Patented Mar. 11, 1924.

unirse ,STATES LEIJIUEL PIERCE STARR/ELL, OF NORTH BIRMINGHAM, ALABAMA.

EXTENSION RACK.

Applcatcnled July 25, 1923. Serial 653,797.l

To all whom t may concern Be it known that I, LEuUnL P. JARRELL, a

citizen of the United States, residing at North Birmingham, in the county of Jefferson and State of Alabama, have inventedv new and useful Improvements in Extension Racks, of which the following is a specilication.

This invention relates to attachments to or accessories for planing machines and has for its object the provision of a novel movably mounted extension rack which may be moved so as to engage the operating gear of the planer table for drawing the table back in case the racl: thereof runs past and ceases to mesh with the operating gear.

An important object is the provision of a device of this character which may be easily swung from its operative to its inoperative position, or vice versa, depending upon whether its use is necessary or not.

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, easy to install, positive in action, efficient and durable in service and a general improvement in the art.

With the above and other objects and advantages in view the invention consists in the details of construction to be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which:

Figure 1 is a somewhat diagrammatic elevation, partly in section, showing a planing machine equipped with my device,

Figure 2 is a plan view of the parts shown in Figure 1,

` Figure 3 is a vertical section showing the device in its operative position,

Figure 4 is an elevation showing the device in inoperative position,

Figure 5 is an end view.

Referring more particularly to the drawings the letter A designates a portion of a planing machine, B represents the table thereof, C the rack on the table and I) the gear which drives the rack.

In carrying out my invention I provide an extension rack structure which includes a supporting bracket 10 secured upon the table and having pivoted thereon a yoke V11, the pivot point being indicated by the numeral 12. Within this yoke is pivotally mounted a rack member 13V the pivot point of which is designated by the numeral 14C, and this rack member may be formed with any desired number of teeth 15 corresponding in shape and size to the teeth of the rack C. The yoke member carries a handle 16 by means of which it may be moved from one position to y another for throwing the extension rack into or out of action.

It should be observed that the end portion of the extension rack is cut away as indicated at 16 for the accommodation of the head of the bolt or screw 12. Another feature is the provision of a groove or recess 17 in the plate or bracket 10 which is designed to mate with a similar groove 18 in the bight portion of the yoke 11 for the reception of a key 19, which will operate to hold the yoke swung into inoperative position as shown in Figure 4. For holding the extension in its operative position, I provide a cotter pin 20 or the like which is passed through holes 21 in the yoke and through a registering hole 22 in the extension 13. Y

In the operation of the device it will be seen that under ordinary conditions, or when the use of the attachment is not desired, the entire extension rack member may be swung into the inoperative position shown in Figure 4L of the drawingsso as to be out of the way and not to have any interference with the action. If for any reason it should occur that the table B moves into such a position that its rack C passes beyond the gear and does not mesh therewith, it is merely necessary that the operator withdraw the key 19, grasp the handle 16, swing the yoke and consequently the extension rack into its operative position as disclosed in Figures 1, 3 and 5 of the drawings, and then insert the cotter pin in place. When this is done the teeth 15 of the extension constitute, in effect, a prolongation of the rack C and these teeth 15 will mesh with the gear D so that the rack, and consequently the table will be drawn back into normal position without involving any delay or the use of any special tools or unusual power.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided a simply constructed, inexpensive and easily installed exvtension device which will be highly convenient and advantageous inservice. Owing to the simplicity of the construction and the fewness of the parts it is apparent that there is practically nothing to get out of order so that the device should have a longlife andv Y satisfactorily perform all of its functions.

While I have shown and described the preferred embodiment of the invention it is of course to be understood that I reserve the right to make such changes iny the form, construction and arrangement of parts as Will not depart from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention I claim:

l. ln combination With a planing machine table carrying a rack meshing With a drive gear; an extension rack structure comprising a bracket mounted upon the table, a yoke pivoted on the bracket, a rack member pivoted Within the yoke and movable to form a continuation of the rack proper, and means for securing said rack member with respect to the yoke.

2. An extension rack attachment for a movable element carrying a rack, comprising a bracket secured upon the movable element, a yoke pivoted upon the bracket, a rack member pivoted Within the yoke and movable to form a continuation of the rack proper, and means for holding the rack member against movement in either direction.

3. An extension rack attachment for planing machines having a movable table carrying a rack meshing With a gear, comprising a bracket secured upon the table7 a yoke pivotally mounted on the bracket, and a fragmentary rack member pivotally mounted Within the yoke and movable to form a continuation of the rack proper for meshing with the gear when the rack has moved past 4 the. gear. i

In testimony whereof I aflix my signature LEMUEL PIERCE JARRELLv

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