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Patent Searching and Data


Title:
NAIL PULLER
Document Type and Number:
WIPO Patent Application WO/2018/134262
Kind Code:
A1
Abstract:
The present invention relates to a nail puller (1), configured to pull a nail (2) out of a hoof (3) having a surface (4), comprising: two halves (7,7), rotatably connected at a rotation axis, each half comprising a handle (8) and a jaw half (9) with an edge (10), wherein the edges of both jaw halves face each other and are configured to selectively engage or disengage the nail that is arranged in a groove of a horse shoe; wherein at least one of the jaw halves comprises an outward facing curved lever surface (11) that extends from the edge; wherein said edge is configured to be insertable into said groove of said horse shoe to engage said nail; and wherein the outward facing curved lever surface extends from the edge towards a pivot (12) defining an end of said curved lever surface

Inventors:
SUAREZ, Fabio Alexander (Calle 47 Nro. 78A-41, Medellin, Does not apply, CO)
Application Number:
EP2018/051121
Publication Date:
July 26, 2018
Filing Date:
January 17, 2018
Export Citation:
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Assignee:
MUSTAD HOOFCARE SA (Rue de l'Industrie 2, 1630 BULLE, 1630, CH)
International Classes:
A01L11/00; B25B7/02
Domestic Patent References:
WO2011064284A12011-06-03
WO2011064284A12011-06-03
Foreign References:
DE8913521U11989-12-28
US1073802A1913-09-23
US4084457A1978-04-18
GB2322325A1998-08-26
DE8901479U11989-04-27
US1073802A1913-09-23
US4084457A1978-04-18
DE8901479U11989-04-27
DE8913521U11989-12-28
GB2322325A1998-08-26
Attorney, Agent or Firm:
HAAN, Raimond Johannes Gerardus (Bezuidenhoutseweg 57, 2594 AC Den Haag, 2594 AC, NL)
Download PDF:
Claims:
Claims

1. Nail puller, configured to pull a nail out of a hoof having a surface, comprising:

- two halves, rotatably connected at a rotation axis, each half comprising a handle and a jaw half with an edge, wherein the edges of both jaw halves face each other and are configured to selectively engage or disengage the nail that is arranged in a groove of a horse shoe;

- wherein at least one of the jaw halves comprises an outward facing curved lever surface that extends from the edge; and

- wherein said edge is configured to be insertable into said groove of said horse shoe to engage said nail;

characterized in that the outward facing curved lever surface extends from the edge towards a pivot defining an end of said curved lever surface.

2. Nail puller according to claim 1 , wherein a nail head accommodation is arranged adjacent the pivot, opposite the curved lever surface.

3. Nail puller according to claim 1 or 2, wherein the outward facing curved lever surface has a width that increases in the direction away from said edge and towards said pivot. 4. Nail puller according to any of the foregoing claims, wherein the other of the jaw halves also comprises an outward facing curved lever surface that extends from the edge towards a pivot.

5. Nail puller according to any of the foregoing claims, wherein a distance from an inner surface of the jaw half to the outward facing curved lever surface increases in the direction away from said edge towards the pivot.

6. Nail puller according to claim 5, wherein the distance increases gradually. 7. Nail puller according to any of the foregoing claims, wherein a distance between the edges of the jaw halves is maintained in a closed state thereof.

8. Nail puller according to any of the foregoing claims, wherein a distance between the edge and the pivot is less than a distance between the nail engaged by said edge and an additional nail opposite the object being engaged relative to the jaw half.

Description:
Nail puller

The present invention relates to a nail puller that is configured to pull a nail out of a hoof having a surface.

Nail pullers for pulling a nail out of a hoof are for example used by farriers, who attach a horse shoe to a hoof using a number of nails. Such horse shoes need periodic replacement. The worn horse shoe has to be removed, requiring the nails to be pulled out of the hoof. As the nails can get stuck very tight over time, removing those nails can be a very hard and physically demanding activity.

The United States patent application US 1 073 802 A is considered the closest prior art, relative to which at least the features of the characterizing portion of claim 1 are novel. In practice, a number of nails are arranged in a groove, also called crease or fuller. If one of those nails is to be removed, adjacent nails may hinder the use of a tool as shown in US 1 073 802 A.

The United States patent application US 4 084 457 A, the German utility models DE 89 01 479 Ul and DE 89 13 521 Ul, the United Kingdom patent application GB 2 322 325 A and the international patent application WO 2011/064284 Al are acknowledged as further prior art.

An object of the present invention is to provide a nail puller, that is improved relative to the prior art and wherein at least one of the above stated problems is obviated.

Said object is achieved with the nail puller according to claim 1 of the present invention.

The nail puller according to the invention provides an increased lever surface, thereby increasing the moment arm and hence the pulling force. When the nail is pulled out of the hoof, the area of the outward facing curved lever surface being in contact with a contact surface displaces from the edge of the jaw half away towards a pivot. Once the pivot has come into contact with the contact surface, the nail puller will make a pivoting movement around this pivot, and will not significantly displace any further. In this way, the nail puller on the one hand provides an increased lever surface compared to conventional nail pullers, whereas the pivot on the other hand limits the space required by the nail puller.

If a lever surface was only increased, this would in some applications result in the lever surface engaging a (head of) an adjacent nail. For example, successive nails in a horse shoe have a limited distance between them. If a moment force was applied to the nail puller to pull a nail out of a hoof, this could result in the nail puller sliding off the adjacent nail. This may result in loss of control of the nail puller, and possibly harm to farrier and/or animal. The prior art tool disclosed in US 1 073 802 A, and shown in Figure 7 in combination with a nail puller according to the present invention, has this disadvantage. The dimensions of the prior art tool are wider, extending past the pivot defining the end of the curved lever surface of the nail puller according to the invention. Consequently, the prior art tool will abut against an adjacent nail, with the risk of sliding off said nail when further leverage is applied to the tool.

In a preferred embodiment, an accommodation is arranged adjacent the pivot, opposite the curved lever surface. This accommodation is configured to accommodate a further nail.

According to a very advantageous preferred embodiment of the invention, the outward facing curved lever surface has a width that increases in the direction away from said edge and towards said pivot. Due to the widening of the curved lever surface, the curved lever surface will force itself out of the groove of the horse shoe when the nail moves out of the hoof. Once the part of the curved lever surface that engages with horse shoe is wider than the groove, the curved lever surface will be completely out of the groove, thereby also to some extent compensating for the increasing length of the nail outside the hoof. Furthermore, as the curved lever surface is now moved out of the groove, it is displaced, i.e. lifted, relative to an adjacent nail that is arranged in said groove. The increasing width of the outward facing curved lever surface away from said edge and towards the pivot, thus provides extra space between the nail puller and adjacent nails. The extra displacement out of the groove on the one hand increases the leverage. On the other hand, the displacement of the curved lever surface out of the groove prevents the nail puller from engaging an adjacent nail with the risk of sliding of said nail when leverage force is applied. The increasing width of the curved lever surface results in a gradual and continuous pulling action, wherein the nail puller gradually moves out of the groove when the nail puller is tilted and the contact between the curved lever surface and the horse shoe is displaced from the edge towards the pivot. Once the pivot is reached, the nail puller tilts further over the pivot, in still a continuous movement. This is a significant advantage relative to the prior art tool of US 1 073 802 A, that will also be inserted in the groove for engagement with the nail, but that will remain in said groove until it abuts an adjacent nail. Once an adjacent nail is engaged by said tool, the head of this adjacent nail - which is displaced relative to the groove - will take over as a pivot point, causing a major discontinuity in the pulling action. Moreover, once the head of the adjacent nails acts as a pivot point, the prior art tool is highly susceptible for skidding of said nail head.

Further preferred embodiments are the subject of the dependent claims.

In the following description preferred embodiments of the present invention are further elucidated with reference to the drawing, in which:

Figure 1 is a perspective cross sectional view of a nail puller according to the invention during use;

Figure 2 is a perspective view of the nail puller of Figure 1 ;

Figure 3 is a side view of the nail puller of Figure 2, in an open state thereof;

Figure 4 is a side view of the nail puller of Figure 3, in a closed state thereof; Figure 5 is one half of the nail puller of Figure 4;

Figure 6 is a detailed view of the half of the nail puller shown in Figure 5.; and

Figure 7 is a combination of the nail puller according to the present invention overlaying the prior art tool according to the closest prior art US 1 073 802 A.

The nail puller 1 according to the invention is configured to pull a nail 2 out of a hoof 3 having a surface 4 (figure 1). The nail 2 is arranged in the hoof 3. More in particular, the nail 2 may have been used to attach a horse shoe 5 to a hoof 3. When the horse shoe 5 needs replacement, it is necessary to remove the nails 2 from the hoof 3, thereby detaching the horse shoe 5 from the hoof 3. The nails 2 are arranged in a groove 6 of saide horse shoe 5.

The nail puller 1 comprises two pivotably connected halves 7. The two halves 7 are rotatably connected at a rotation axis 21 (Figure 2). Each half 7 comprises a handle 8 and a jaw half 9 with an edge 10. The edges 10 of both jaw halves 9 face each other and are configured to selectively engage or disengage the nail 2, more in particular a head of said nail 2. At least one of the jaw halves 9 comprises an outward facing curved lever surface 11 that extends from the edge 10 towards a pivot 12.

After engaging nail 2 with the edges 10 and inner surfaces 13 of the jaw halves 9, the nail puller 1 may be used to gradually loosen and pull the nail 2 by a wrenching movement, i.e. by moving the nail puller 1 by its handles 8 back and forth.

The nail puller 1 provides an increased lever surface 11 compared to conventional nail pullers, thereby increasing the moment arm and hence the pulling force. The increased lever surface 11 can be best seen in Figure 7, wherein both the nail puller according to the present invention and the prior art nail puller according to the closest prior art US 1 073 802 A are shown. The increased area is indicated by reference 22, which may be regarded a protrusion 22 relative to the contour of the prior art nail puller. In Figure 7, area / protrusion 22 is shaded for the jaw half 9 on the right side in the Figure. When the nail 2 is pulled out of the hoof 3, the area of the outward facing curved lever surface 11 being in contact with a contact surface displaces from the edge 10 of the jaw half 9 away towards the pivot 12. Once the pivot 12 has come in contact with the contact surface, the nail puller 1 will make a pivoting movement around this pivot 12, and will not significantly displace any further. In this way, the nail puller 1 on the one hand provides an increased lever surface 11 compared to conventional nail pullers, whereas the pivot 12 on the other hand limits space required by the nail puller 1.

A nail head accommodation 14 is arranged adjacent the pivot 12, opposite the curved lever surface 11. This nail head accommodation 14 is configured to accommodate an additional nail 2 that is arranged near the to be pulled nail 2 that is engaged with the jaw halves 9. The nail head accommodation 14 allows the nail puller 1 to be moved, i.e. tilted, further within the limited space available between two adjacent nails 2. During use, a nail 2 that is arranged in said groove 6 of the horse shoe 5, is first engaged by the edges 10 that are inserted in said groove 6 on opposite sides of the nail 2. The user then moves the halves 7 towards each other, thereby clamping the edges 10 against the nail 2. Once firmly engaged, the user will tilt the nail puller 1, thereby rolling the curved lever surface 11 against the horse shoe 5 and loosening the nail 2 by a wrenching action. In the preferred embodiment, wherein the curved lever surface 11 has a width that increases in the direction away from said edge 10 and towards said pivot 12 (Figure 2), tilting of the nail puller 1 also results in the curved lever surface 11 forcing itself out of the groove 6 of the horses hoe 5 when the nail 2 moves out of the hoof 3. The nail 2, which is now loosened, is successively pulled out of the hoof 3 by tilting the nail puller 1 even further until the pivot 12 that defines and end of the curved lever surface 11 comes into engagement with the horse shoe 5. Once pivot 12 is reached, the respective jaw half 12 will further pivot over this pivot 12. Due to the nail puller 1 being lifted out of the groove 5, the risk of the nail puller 1 engaging an adjacent nail is significantly reduced. However, in order to reduce this risk even further, a nail head accommodation 14 is arranged adjacent the pivot 12, opposite the curved lever surface 11.

Preferably, the other of the jaw halves 9 also comprises an outward facing curved lever surface 11 that extends from the edge 10 towards a pivot 12. If both jaw halves 9 comprise such an outward facing curved lever surface 11 , the nail puller 1 is effective in both directions of the back and forth wrenching movement.

A distance 15 from the inner surface 13 of the jaw half 9 to the outward facing curved lever surface 11 increases in the direction away from said edge 10 towards the pivot 12, thereby increasing the moment arm when the nail 2 is extending further out of the hoof 3.

The distance 15 increases gradually, thereby gradually compensating for the nail 2 gradually moving out of said hoof 3 when said nail puller 1 is used.

As can be seen in figure 4, a distance 16 between the edges 10 of the jaw halves 9 is maintained in a closed state thereof. This distance 16 between the jaw halves 9 reduces the degree the jaw halves 9 have to be opened in order to engage nail 2. This distance 16 thus also reduces the space being occupied by said jaw halves 9 of said nail puller 1 between the engaged nail 2 and neighboring nails 2.

Figure 2 shows that the outward facing curved lever surface 11 has a width 17 that increases in the direction away from said edge 10 and towards said pivot 12. In this way, the nail puller 1 may be inserted with the edges of the jaw halves 9 into a groove 6 of a horse shoe 5, facilitating engagement of the nail 2 that is also accommodated in said groove 6. However, due to the widening of the curved lever surface 11 , the curved lever surface 11 will force itself out of groove 18 when the nail 2 moves out of the hoof 3. Once the part of the curved lever surface 11 that engages with horse shoe 5 is wider than the groove 6, the curved lever surface 11 will be completely out of the groove 6, thereby also to some extent compensating for the increasing length of the nail 2 outside the hoof 3. The increasing width of the outward facing curved lever surface 11 thus causes the nail puller 1 to be lifted out of the groove 6. This on the one hand increases the leverage, and on the other hand, it prevents the nail puller 1 from engaging an adjacent nail with the risk of sliding of said nail when leverage force is applied.

A distance 19 between the edge 10 and the pivot 12 is preferably less than a distance 20 between the elongate nail 2 engaged by said edge 10 and an additional elongate nail 2' opposite the nail 2 being engaged relative to the jaw half 9 (Figure 1). In this way, a jaw half 9 of the nail puller 1 fits between two adjacent nails 2.

The nail puller according to the present invention (as also shown in Figure 4) and the prior art nail puller according to the closest prior art US 1 073 802 A are combined in Figure 7. This Figure 7 clearly shows that the jaw halves 9 have a shape providing a leverage protrusion 22 relative to the prior art nail puller.

The above described embodiment is intended only to illustrate the invention and not to limit in any way the scope of the invention. Accordingly, it should be understood that where features mentioned in the appended claims are followed by reference signs, such signs are included solely for the purpose of enhancing the intelligibility of the claims and are in no way limiting on the scope of the claims. The scope of the invention is defined solely by the following claims.