US2390611A

US2390611A - Wedge grip scraper blade

Info

Publication number: US2390611A
Application number: US535959A
Authority: US
Inventors: Virgil H Nixon
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-05-17
Filing date: 1944-05-17
Publication date: 1945-12-11
Anticipated expiration: 1962-12-11

Description

Dec. 11, 1945. v H, WON 2,390,611

wEDGE GRIP SCRAPR BLADE Filed May 17, v1944 2 shets-sh'eeul INV ENTOR.

)TTOPNEK 1 Patented Dec. 114, 1,945

UNITED STATES PATENT OFFICE invention relates to scrapers of the drag d1' pull type that are usually employed in the collection and transportation of heavy materials such gravel, comminutecl minerals, ore, coal and other substances, 'mined from subterranean cavities of an open or closed Character.

One of the important objects of this invention is the provision of a scraper of the pull or drag' typ, having as a component part thereof, a replaceable, intercnangeable'and quickly attachable blade that is associated with the lback member of the scraperand which has unique and novel struct'uif at the. Zone of juncture with the said back member, to' insure an ever tightening grip as the scraper is normally used.

A still further aim of this invention is the provision of a heavy duty scraper having a sectional blade, the parts whereof may be interchanged to allow equalizing the wear thereon and to theref fore, assure extended life of the blade as a unit.

Other objects of this invention include the unique and novel form of interengaging elements f the scraper back member and scraper blade, Which elements in their preferred embodiment, assume the character of a longitudinal groove, wedge-shaped in cross section, formed in the blade, a wedge-shaped marginal edge on the back member of the scraper, and uniquely disposed bolts designed and located to draw the inclined faces of the wedge-shaped portions of the back member and blade into progressively tighter engagement as the bolts are positioned.

Other objects of the invention will appear during the course of the following specication, referring to the accompanying drawings, wherein:

Fig. 1 is a top plan View of a scraper having a blade made in accordance with the present ini vention.

Fig. 2 is a side elevational View of the same.

Fig. 3 is a rear elevational View of the scraper.

Fig. 4 is a fragmentary cross sectional view taken on line IV-IV of Fig. 3.

l Fig. 5 is a similar sectional View taken on line V-V oflig. 3.

Fig. 6 is a perspective fragmentary detailed stretch-out View of a portion of the marginal edge of the back member of the scraper and a portion of the blade showing these parts in a separated condition; and

Fig.v 7 is a similar perspective sectional fragmentary stretch-out view of the zone of connection between the marginal edge of the back member of the scraper and the blade thereof.

'I'he hereinafter described blade may be applied to any type scraper, but the heavy duty model illustrated is'most advantageously equipped witha removable blade, and therefore, it will be understood that the `hereinaiter described features embodied in the blade and disposed at the zone of attachment thereof, may be employed re-` gardle'ss of the sp'ecc form of the sc'nap'e'r.

Like reference characters refer' to' similar parte and the numeral l0 generally designates a scraper adapted for attachment to a tractor or the like, not here Showni Any means of pulling the scraper may be secured tothe hitch I2.

The back member I4 is arcuate in transverse cross' section and usually assumes the positionwith respect to the horizontal,` illustrated in Figs. 2, 4 and 5'.` Reinforcing` ribs I6 diverge from aY point of connection with hitch I2 and terminate `near themarginaledge' of back member I4. Back member I4 terminates in a marginal edge i8 that is wedge-shaped in cross section. The faces 2U and 22 of this marginal edge merge at the free end of back member I4 and the innermost portion of face 20 terminates at a shoulder 24, the purpose whereof is presently to be set down.

The wedge-shaped marginal edge I8 of back member I4 is provided with a number of

openings

26 and 28 specially disposed as regards their longitudinal axes and for the reception of

bolts

30 and 32 respectively. Openings 26 are provided through marginal edge I8 and have their axes substantially perpendicular to the plane of face 2U. .Openings 28 are formed through the marginal edge I 8 and are inclined with respect to the major plane of Wedge-shaped marginal edge I8 and the blade sections 40. Openings 28 each communicate with a cavity 36 formed. in the back member I4.

The blade in its entirety is designated by the numeral 38. The sections 40 thereof, `are two in number, as illustrated in Figs. 1 and 3. A larger number of sections may be employed but where the blade 38 is sectional, the spacing of the

openings

26 and 28 in back member I4 should correspond so that interchanging of sections 40 may occur.

Each section 4I) is identical in character in that it is a wedge-shaped body in transverse cross section, having a longitudinal groove 42 that is likewise wedge-shaped in transverse cross section. 'Ihe angle of inclination of the sides of groove 42 formed in blade sections 40, is the same as the angularity of faces 20 and 22 of marginal edges I8. Holes 44and 45 through the bifurcated part of blade section 3U, receive the

bolts

30 and 32, as illustrated in Fig. 5.

v A boss 48 on the lead surface of blade sections 40, cooperates with holes 44 and 46 in providing a shoulder for the head of bolt 32 and a cavity for the reception of nut 50 in screw-threaded engagement with bolt 30. Cavity 36 accommodates nut 52 and an access opening 54 in one wall of the bifurcated portion of section 4|] permits the operator to reach and tighten nut 52.

The inner edge of one of the walls of the bifurcated portion of scraper section 40, engages shoulder 24 when the parts are assembledas ilylustrated: When the bolt and

nut

32 and 52. re-

spectively, are tightened, blade section 40 is pulled inwardly to tightly wedge together the specially contoured marginal edge of back member I4 and similarly contoured groove 42 in blade section 40. This action on the part of the interconnecting means is augmented and continuously supplemented by the normal operation of the scraper-f that is when the scraper is pulled, blade sections 40 are forced into tighter engagement with back member I4 and no tendency to exert strain upon

bolts

30 and 32 is presented. The presence of the blade sections -40 that extend the fulllength of the free marginal edge of back member I4, protects the said marginal edge thereof and when new blade sections are required, the protected surface will always receive the replaced blades.

It is important that

bolts

30 and 32 be disposed with respect to each other and their interconnected parts, as illustrated in Fig. 5 and above defined.

Modifications and changes in specific form of the parts may be made so long as the same are not changed to prevent enjoying one of the objects of the invention, i. e., the ability to interchange sections 40 of blade 38. It is known that the outer portions of each blade section 40 will wear to a greater degree than the edge throughout the remaining portion of the length of each section. When wear has occurred to such an extent that material Will escape beneath the worn edges, sections 4l] are interchanged to cause the free edges of sections to assume and maintain rectilinear form. The spacing of the sevy eral bolts which form the means for securing the yblade sections in place, is the same to each side of a vertical medial line of the back member.

. Having thus describedthe invention,what is claimed as new and desired to be secured by Letters Patent isz' 1. In a scraper of the character described, a back member having a marginal portion, wedgeshaped in transverse cross section, along one edge thereof said marginal portion having a series of spaced cavities formed therein with openings in communication therewith and extending to the outer faces of the marginal portion, said openings having their longitudinal axes at angles to each other; a blade provided with a longitudinal wedge-shaped groove along one edge thereof for receiving the said wedge-shaped marginal edge of the back member, said blade having holes formed therein in register with the openings in the back member; and bolts in the openingsand holes, whereby certain of said bolts are disposed at an angle to exert transverse pressure on the blade to force the wedge-shaped marginal portion of the back member into the said groove of the blade when the bolts are tightened.

2. A scraper of the character set forth in claim l wherein the bolts have heads on one end and nuts on the opposite ends, and said body member and blade have the openings and holes respectively therein formed to receive said heads and the said nuts.

' VIRGIL H. NIXON.