US1862612A

US1862612A - Expansion joint groove forming device

Info

Publication number: US1862612A
Application number: US217755A
Authority: US
Inventors: Robert C Thomasson
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-09-06
Filing date: 1927-09-06
Publication date: 1932-06-14
Anticipated expiration: 1949-06-14

Description

June 14, 1932. R. c. THoMAssoN EXPANSIDN JOINT GROOVE FORMING DEVICE Filed Sept) 6, 1927 gmmtoo J2. aTiwmszs'am 1 a U I: I

Patented June 14, 1932 UNITED STATES PATENT OFFICE- EXPANSION JOINT GROOVE FORMING DEVICE Application filed September 6, 1927. Serial No. 217,755.

This invention relates to a device designed for use in the formation of a groove in a concrete road surface or the like to facilitate the formation of an expansion I 5 oint.

The primary object of the invention is to provide a device of this character which will form a groove having vertical walls for the reception of the paper, tar or other filler employed in the construction of the expansion joint.

A further object of the invention is to insure an even bearing on the concrete on either side of the dummy joint expansion paper, used in the construction of the expansion joint. I

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be madewithin the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawing:

Figure 1 is a side elevational view of a device constructed in accordance with the invention.

Figure 2 is a plan view thereof.

Figure 3 is a transverse sectional view through the roller of the device.

Referring to the drawing in detail, the device includes a handle portion 5 having a downwardly extended end portion 6 terminating in a blade 7 the opposite end of the handle portion being formed into a handgrip 8 whereby the device may be moved to accomplish its purpose.

The handle is bolted between the ends 9 of the arms 10 which have their forward ends formed into bearings 11 for the reception of the axle 12 on which the sectional roller 13 is secured.

Removably supported on the axle 12 and clamped between the inner ends of the sections of the roller 13 is a disk-like blade 14, the disk-like blade being of a diameter so that the cutting edge thereof extends an appreciable distance beyond the roller 13 exposing a large portion of the disk so that the groove formed thereby will have sufficient depth to insure a practical expansion joint.

The sections of the roller 13 as well as the blade 14 have aligning openings, the openings of one section being formed with threads to accommodate the threaded extremity of the screw 15, which when properly positionno ed, acts to draw the sections of the roller 13 together into gripping relation with the member 14.

Washers 16 are supported on opposite sides of the bearings 11 and cotter keys 17 are provided for holding the axle in position. Thus it will be seen that due to the construction of the roller and disk-like blade 14, the sections of the roller may be disconnected and the blade 14 removed and replaced, should the blade become dull, or otherwise rendered inoperative.

The groove forming device also embodies an elongated guide plate 18 which is formed with straps 19 at its ends, which straps re- 'ceive the right angled extremities 20 of the lifting irons 21, to the end that the device may be readily and easily lifted or moved from place to place.

Disposed intermediate the side edges of the so guide plate 18 and arranged longitudinally thereof, is the guide slot 22 in which the disklike blade 14 moves when the device is in operation. As shown, this slot 22 has its ends disposed adjacent to the ends of the plate 18, the length of the slot being however sufiicient to guide the blade in the formation of a groove in a concrete surface, during the construction of an expansion oint, it being underst-ood that the length of the guide plate 18 will be varied according to the work for which the device is to be used, that is to say,

if an expansion joint groove is to be formed in a wide roadway, a longer guide plate 18 will necessarily have to replace a shorter guide plate used for the formation of an expansion groove in a sidewalk.

In the use of the device, the concrete is poured between the usual forms, and the plate is placed thereover, the plate resting on the m0 upper edges of the forms in a manner as shown by Figure 1. The blade 7 is now positioned within the slot of the guide plate at a point adjacent to one of the forms and pressed downwardly, and moved a short distance from the form, thereby forming a groove adjacent to the forms, which could not otherwise be formed by the blade 14.

The blade 14 is now dropped into the slot and the device is moved throughout the length of the guide plate 18, with thezresult that a groove having vertical walls is provided, the surface ofthe concrete adjacent to the groove being level.

The material of which the expansion joint is formed may now be positioned in the groove. 7

I claim;-

1. In a device of the character described, a roller, a cutting disk disposed at a point intermediate the ends of the roller and -having portions thereof extended beyond the periphery of the roller, a guide plate having a slot through which the cutting disk. operates to cut material under the plate, and

'meansfor operating the roller.

2. In a device of the character described, an axle, a sectional roller mounted on the axle, a'disk-like cutting member mounted on the axle, portions thereof extending-beyond the periphery of the roller, a guide plate havingla slot through which the-cutting member operates, to cut materialthereunder, and a handle for moving'the .roller over the guide plate.

3. In a device of the character described, a frame, an axle supported by the frame,.a sectional roller mounted on the axle, a.disk-like cutting member clamped between the adjacent ends of the sections of the roller,..means extending through the sections of the roller and disk-like cutting member for holding. the sections of the roller and disk-like cutting member together, a guide plate having a slot extending throughout the length thereoflsaid guide plate providing a support for the roller, said disk-like cuttingmember-operating through the slot to cut material thereunder, and means for movingthe roller over the guide plate.

4. Ina device of the character described, a supportingaxle, a roller mounted ontheaxle,

a disk-like cuttin member on the .axle and disposed interme iate the ends of, the roller, a handle, arms connected with the handleand having bearings formed at their outer ends, said bearings accommodating the axle, ,a

bearing plate having a slot formed therein,

said roller adapted to moveover the :bearing plate, and said disk-like cutting .member adapted to move through the. slot to .cut material thereunder.

5. In a device of the character described, an axle, a roller .mounted on the axle, a blade supportedon the axleat apoint intermediate the ends of the roller, an elongated guide plate having a slot formed therein, and through which the blade moves, a handle, arms secured to the handle and havin bearings in which the axle moves, said andle having a downwardly extended end portion formed into a blade, the last mentioned blade adapted to operate through the slot to cut material supported thereunder, and said handle affording means to permit the device to be moved longitudinally of the guide plate.

6. In a device of the character described, a weighted roller, a blade carried by the roller, a handle for operating the roller, a blade formed at one end of the handle and lying adjacent. to the first mentioned blade, a guide plate over which the roller moves, said guide plate having a slot extended therethrough toaccommodate theblades, and means for securing the blade to the roller.

7. Adevice of the class described, a rotary knife-like cutter, means for moving the same over the surface of a concrete structure to produce a slot in, said structure, and means for guiding said cutter comprising a relatively long portable board-likestrip adapted to be laid over the surface of the concrete, and a slotin said strip adapted to receive said cutter, a mounting for said cutter comprising a roller adapted to bridge the slot in the strip with the cutter received by the slot, the surface of the strip on opposite sides of the slot, providing a treadsurface for said rollers substantially as and for the purpose described.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signa-