US3822518A

US3822518A - Sanding shoe and clip therefor

Info

Publication number: US3822518A
Application number: US00286937A
Authority: US
Inventors: G Sjostrand
Original assignee: RODAC PNEUMATIC TOOLS
Current assignee: RODAC PNEUMATIC TOOLS
Priority date: 1972-09-07
Filing date: 1972-09-07
Publication date: 1974-07-09
Anticipated expiration: 1991-07-09

Abstract

A sanding shoe having an over-center type clip for clamping an abrasive sanding sheet to the end of the shoe. The shoe itself is fabricated from rubber having a metal panel or insert molded into it near the upper surface. The rubber material forms an upstanding rib at the end of the shoe with bevelled inside surfaces. The ends of the abrasive sheet come over the end ribs and it is clamped thereto by a resilient U-shaped metal clamp which is held in the clamped position by an over-center movement.

Description

United States Patent [191 Sjostrand 11'] 3,822,518 [451 July 9,1974

[ SANDING SHOE AND CLIP THEREFOR [75] Inventor: Gerald D. Sjostrand, Fresno, Calif.

[73] Assignee: Rodac Pneumatic Tools, bos

Angeles, Calif. [22] Filed: Sept. 7, 1972 [21] App]. No.: 286,937

[52] US. Cl. 51/386 [51] Int. Cl B24d 17/00 [58] Field of Search 5l/358, 382-387, 51/359 [56] References Cited UNITED STATES PATENTS 2,077,405 4/l937 Enge 51/385 2,509,561 5/l950 Drenel SI/386 7/1955 Champayne 5l/359 Yelpo et al. 51/385 Thomas 51/386 Primary Examiner-Othell M. Simpson Attorney, Agent, or Firm-Herzig & Walsh [5 7] ABSTRACT A sanding shoe having an over-center type clip for clamping an abrasive sanding sheet to the end of the shoe. The shoe itself is fabricated from rubber having a metal panel or insert molded into it near the upper surface. The rubber material forms an upstanding rib at the end of the shoe with bevelled inside surfaces. The ends of the abrasive sheet come over the end ribs and it is clamped thereto by a resilient U-shaped metal clamp which is held in the clamped position by an over-center movement.

14 Claims, 6 Drawing Figures 1 SANDING SHOE AND CLIP THEREFOR SUMMARY OF THE INVENTION The invention relates to a shoe for sanding tools having end clips for clamping a sheet of abrasive material,

such as abrasive paper, to the shoe.

In the prior art, there are various known types of clips for clamping an abrasive paper sheet to a reciprocatable sanding shoe. Typically, the abrasive sheet is brought up over the ends of the shoe and clamped to the shoe. Certain improvements are embodied in the clip of the herein invention for the purpose of realizing certain objectives. The shoe itself is molded of rubber with a metal plate molded into it in the upper part for additional rigidity. At the ends of the shoe, there are formed ribs extending above the top surface of the shoe. These ribs have slanting or bevelled inside surfaces. The ribs are integral with the rubber of the shoe itself. The clip is in the form of a resilient U-shaped member, the legs of which are secured to the shoe and the bight of which has an edge part with teeth adapted for clamping the end of the abrasive sheet between it and the end rib. This improved construction enables certain objectives to be realized. A primary object is to provide a construction which will insure adequate clamping of the end of the abrasive sheet in such a way that it will be held without tearing loose. This object is accomplished by reason of the resiliency of the end rib and its bevelled surface against which the end of the sheet is clamped. I A further object is to provide a simple clip or clamping means which is economical and easy to fabricate since it simply takes the form of a resilient U-shaped member having its legs secured to the top surface of the shoe and which is provided with an over-center movement mechanism for urging it'into clamping position, wherein it clamps the end of the abrasive sheet.

BRIEF DESCRIPTION OF THE DRAWINGS Further objects and additional advantages of the invention will become apparent from the following detailed description and annexed drawings, wherein:

FIG. 1 isa plan view of a preferred form of the invention; I

FIG.2 is a perspective view of one end of the form of the invention shown in FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 of F IG. 2; 1

FIG. 4 is a sectional view taken along line 4-4 of FIG.- 3;

FIG. Sis a perspective view similar to that of FIG. 2 showing the over-center latching mechanism in the release position; and

FIG. 6 is a sectional view taken along the line 6-6 of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawings, shoe 10 is of rectangular, elongated configuration and comprises member 12 preferably fabricated from rubber having a metal plate 14 molded into it, as may be seen in FIG. 3. Plate 14 is molded in near the top surface of member 12.

Numerals

16 and 18 designate screws, having heads molded into the shoe as shown in FIG. 3. Screws l6 and 18 are for attaching or securing the handle to the shoe.

At the ends of the shoe, rubber member 12 is formed to provide ribs on the upper side: thereof, such as indicated by rib 24 in FIG. 3. These ribs are integral with the shoe itself, being fabricated as a part of the rubber material. The top or inner surface of the ribs has a slant or bevel as designated at 26 for rib 24.

FIGS. 2 through 6 show one of the clamping devices at one end of the shoe. The clamping devices are similar at both ends. Oneof the clamping devices is designated generally at 30. Numeral 32 designates a resilient metal clamping member of U-shaped configuration having a bight part 34 and

legs

36 and 38. The legs are secured to the top. surface of shoe 10 by

rivets

40 and 42. Bight part 34 has downtumedl edge 44 having teeth in it adapted to bite into and engage the end part of an abrasive sheet 50 which may be paper or the like.

Numeral 54'designates a shaft joumalling member which has a horizontal foot 56 secured to the top surface of shoe 10 by

rivets

58 and 60. It has an upstanding part 62 which is bent over as shown at 64 in FIG. 5 to form a joumalling receptacle which receives and journals the intermediate part of shaft 70. The intermediate part 72 is in the form of a crank and is journalled in the journal means 54. At one end of shaft 70, there is formed an operating handle 72 having a bend in it to facilitate fastening it. The parts of the shaft adjacent to crank part 72 as designated at 74 and 76 normally bear on

legs

36 and 38 of clip member 32 as may be seen in FIG. 2. Member 32 is resilient and when unrestrained takes an open position in which edge 44 is spaced from rib 24 asmay be seen in FIG. 5. In the open position, handle 72 is positioned as shown in FIGS. 5 and 6. When handle 72:is grasped and rotated in a clockwise direction, from the position as shownin FIG. 6, it can be moved into a position as shown in FIGS. 2 and 3 wherein the handle comes down onto the top surface of shoe 10.

Portions

74 and 76 of shaft 70 move in a clockwise direction and bear against

legs

36 and 38 of clip 32 adjacent to bight 34. By camming action, they force the clip down into the clamping position. In this position, edge 44 and the teeth on it bite into the end part of abrasive sheet material 50 and then engage into the rubber of rib 24 through bevelled surface 26, as may be seen. This holds the abrasive material securely in position and eliminates tearing loose of the abrasive material because of the resiliency of material 24 and its bevelled surface 26., the end of the abrasive sheet being between this surface and edge 44 of the clip.

From the foregoing, those skilled in the art will readily understand the nature and construction of the inventionand the manner in which it realizes the objects as set forth in the foregoing.

The foregoing disclosure is representative of a preferred form of the invention and is to be interpreted in an illustrative rather than a limiting sense, the invention to be accorded the full scope of the claims appended hereto.

What is claimed is:

1. A sanding tool, comprising:

a sanding shoe having upper and lower major surfaces and first and second spaced apart ends, an inwardly sloping beveled surface of resilient material being formed on said upper major surface adjacent each of said shoe ends;

a pair of resilient clamping members having inner and outer ends, a downwardly extending clamping edge being formed on each of said clamping member outer ends, said clamping members having their inner ends secured on said shoe and being mounted over opposite ends of the upper major surface of said shoe, each of said clamping members having a predetermined shape to assume when unbent a position in which its clamping edge overlies and is spaced apart above said beveled surface formed on said shoe end with which it is associated; and

selectively releasable latch means for locking said clamping members with their clamping edges in tight engagement with said beveled surfaces whereby an abrasive sheet of material may be secured on said shoe to extend between the ends thereof across said shoes major lower surface by folding opposite ends of the abrasive sheet over the beveled surface on opposite ends of said shoe and then locking said latch means.

2. The invention defined in claim 1 wherein said clamping edges have downwardly extending teeth formed thereon positioned to engage said beveled surfaces when said latch means is locked.

3. The invention defined in claim 1 wherein said beveled surfaces are made of rubber. 4 The invention defined in claim 1 wherein said shoe is made of a substantially rigid interiorly positioned reinforcing plate surrounded by rubber, said rubber defining the outer surfaces of said shoe.

5. The invention defined in claim 1 wherein each of said clamping edges extends substantially at a right angle to the one of said beveled surfaces with which it is associated.

6. The invention defined in claim 1 wherein each of said clamping members is a substantially U-shaped piece of spring metal having a pair of spaced apart mutually parallel legs connected on their outer ends by a bight portion, said bight portion defining the outer end of said clamping member and the inner ends of said legs defining the inner end of said clamping member.

7. The invention defined in claim 1 wherein said latch means includes a two position over center actuating mechanism associated with each of said clamping members, each of said over center actuating mechanisms being mounted on the upper major surface of said shoe in engagement with its associated one of said clamping members and being selectively movable between a locked and unlocked position, each of said over center actuating mechanisms being operable in its locked position to depress and hold the clamping member it engages with its clamping edge in engagement with the associated one of said beveled surfaces and in its unlocked position permitting said clamping member to assume its unbent shape.

8. The invention defined in claim 6 wherein said latch means includes a two position over center actuating mechanism associated with each of said clamping members, each of said over center actuating mechanisms being mounted on the upper major surface of said shoe in engagement with its associated one of said clamping members and being selectively movable between a locked and unlocked position, each of said over center actuating mechanisms being operable in its locked position to depress and hold the clamping member it engages with its clamping edge in engagement with the associated one of said beveled surfaces and in its unlocked position permitting said clamping member to assume its unbent shape.

9. The invention defined in claim 8 wherein each of said over center actuating mechanisms is formed by a crank member rotatably mounted on said shoe, said crank members having portions offset from their axes of rotation which may be selectively rotated downwardly'substantially simultaneously into engagement with each of the legs of the one of said clamping members with which it is associated whereby to force said clamping member into engagement with its associated one of said beveled surfaces.

10. The invention defined in claim 1 including screws having their heads rigidly secured and imbedded in said shoe with the shaft portions of said screws extending upwardly from the upper major surface of said shoe so that a sanding tool handle may be secured thereon.

11. The invention defined in claim 1 wherein:

each of said clamping edges extends substantially at a right angle to the one of said beveled surfaces with which it is associated; and

each of said clamping edges has downwardly extending teeth formed thereon positioned to engage the the one of said beveled surfaces with which it is associated when said latch means is locked.

12. The invention defined in claim 11 wherein said latch means includes a two position over center actuating mechanism associated with each of said clamping members, each of said over center actuating mechanisms'being mounted on the upper major surface of said shoe in engagement with its associated one of said clamping members and being selectively movable between a locked and unlocked position, each of said over center actuating mechanisms being operable in its locked position to depress and hold the clamping member it engages with its clamping edge in engagement with the associated one of said beveled surfaces and in its unlocked position permitting said clamping member to assume its unbent shape.

13. The invention defined in claim 12 wherein said shoe is made of a substantially rigid interiorly positioned reinforcing plate surrounded by rubber, said rubber defining the outer surfaces of said shoe.

14. The invention defined in claim 11, wherein said beveled surfaces are made of rubber.

Claims

1. A sanding tool, comprising: a sanding shoe having upper and lower major surfaces and first and second spaced apart ends, an inwardly sloping beveled surface of resilient material being formed on said upper major surface adjacent each of said shoe ends; a pair of resilient clamping members having inner and outer ends, a downwardly extending clamping edge being formed on each of said clamping member outer ends, said clamping members having their inner ends secured on said shoe and being mounted over opposite ends of the upper major surface of said shoe, each of said clamping members having a predetermined shape to assume when unbent a position in which its clamping edge overlies and is spaced apart above said beveled surface formed on said shoe end with which it is associated; and selectively releasable latch means for locking said clamping members with their clamping edges in tight eNgagement with said beveled surfaces whereby an abrasive sheet of material may be secured on said shoe to extend between the ends thereof across said shoe''s major lower surface by folding opposite ends of the abrasive sheet over the beveled surface on opposite ends of said shoe and then locking said latch means.

3. The invention defined in claim 1 wherein said beveled surfaces are made of rubber.

4. The invention defined in claim 1 wherein said shoe is made of a substantially rigid interiorly positioned reinforcing plate surrounded by rubber, said rubber defining the outer surfaces of said shoe.

9. The invention defined in claim 8 wherein each of said over center actuating mechanisms is formed by a crank member rotatably mounted on said shoe, said crank members having portions offset from their axes of rotation which may be selectively rotated downwardly substantially simultaneously into engagement with each of the legs of the one of said clamping members with which it is associated whereby to force said clamping member into engagement with its associated one of said beveled surfaces.

11. The invention defined in claim 1 wherein: each of said clamping edges extends substantially at a right angle to the one of said beveled surfaces with which it is associated; and each of said clamping edges has downwardly extending teeth formed thereon positioned to engage the the one of said beveled surfaces with which it is associated when said latch means is locked.

12. The invention defined in claim 11 wherein said latch means includes a two position over center actuating mechAnism associated with each of said clamping members, each of said over center actuating mechanisms being mounted on the upper major surface of said shoe in engagement with its associated one of said clamping members and being selectively movable between a locked and unlocked position, each of said over center actuating mechanisms being operable in its locked position to depress and hold the clamping member it engages with its clamping edge in engagement with the associated one of said beveled surfaces and in its unlocked position permitting said clamping member to assume its unbent shape.